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WO2024247105A1 - Procédé d'immobilisation de co2 et dispositif d'immobilisation de co2 - Google Patents

Procédé d'immobilisation de co2 et dispositif d'immobilisation de co2 Download PDF

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Publication number
WO2024247105A1
WO2024247105A1 PCT/JP2023/020091 JP2023020091W WO2024247105A1 WO 2024247105 A1 WO2024247105 A1 WO 2024247105A1 JP 2023020091 W JP2023020091 W JP 2023020091W WO 2024247105 A1 WO2024247105 A1 WO 2024247105A1
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Prior art keywords
alkaline earth
earth metal
slurry
stirring tank
liquid phase
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English (en)
Japanese (ja)
Inventor
賢三 左右田
泰教 濃添
翔 藤本
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JGC Corp
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JGC Corp
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Priority to PCT/JP2023/020091 priority Critical patent/WO2024247105A1/fr
Priority to PCT/JP2024/017287 priority patent/WO2024247647A1/fr
Priority to AU2024279042A priority patent/AU2024279042A1/en
Publication of WO2024247105A1 publication Critical patent/WO2024247105A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides

Definitions

  • the present disclosure relates to a CO2 fixation method and a CO2 fixation device.
  • Mineral carbonation is known as one of the CO2 fixation technologies aimed at reducing the amount of CO2 gas emitted into the atmosphere.
  • the mineral carbonation involves reacting alkaline earth metals such as Mg and Ca contained in ores, steel slag, waste concrete, construction waste, coal ash, cement slag, industrial waste, etc. with CO2 gas emitted from, for example, factories and power plants to fix the CO2 gas.
  • Patent Document 1 JP Patent Publication No. 2011-5017266 describes "a method for fixing or binding carbon dioxide (CO 2 ) as a carbonate , the method comprising the following steps: preparing an aqueous solution of water and coal ash or coal residue; contacting a gas containing CO 2 with the aqueous solution; and reacting the CO 2 with the aqueous solution to produce a carbonate, thereby fixing or binding the CO 2 .”
  • Patent Document 2 JP Patent Publication No. 2021-524805 describes an integrated process for the capture, sequestration and utilization of carbon dioxide, comprising the steps of: a) providing an aqueous slurry containing an aqueous liquid and a particulate solid containing an activated magnesium silicate mineral; and b) dissolving the aqueous slurry in a dissolving step by dissolving the activated magnesium silicate mineral in a particulate solid containing an activated magnesium silicate mineral.
  • the integrated process includes the steps of: contacting a magnesium-containing gas stream with the aqueous slurry to dissolve magnesium from the minerals to provide a slurry comprising a magnesium ion-enriched aqueous carbonated liquid and a magnesium-depleted solid residue; c) subjecting at least a portion of the magnesium-depleted solid residue from step b) to a size classification process to separate the magnesium-depleted solid residue into a fine particle size fraction and a coarse particle size fraction; d) subjecting at least a portion of the coarse particle size fraction from step c) to a size reduction process to provide a size reduced fraction; e) repeating step b) providing an aqueous slurry comprising the size reduced fraction from step d), where step e) does not include use of the fine particle size fraction from step c); and f) precipitating magnesium carbonate from the magnesium ions dissolved in steps b) and e) in a precipitation stage.”
  • Patent document 3 (WO 2013/131193) describes a method of isolating carbon dioxide from a carbon dioxide-containing gas, the method comprising: contacting the carbon dioxide-containing gas with an aqueous slurry containing an alkaline earth metal-containing material in a carbonation unit for carbonating at least a portion of the alkaline earth metal to produce a carbon dioxide-depleted gas and a carbonate-containing slurry containing precipitable carbonates and substantially free of precipitated alkaline earth metal carbonates; removing the carbonate-containing slurry from the carbonation unit and separating the carbonate-containing slurry into an aqueous phase containing the precipitable carbonates and a solid phase; and feeding the aqueous phase to a precipitation device and precipitating the alkaline earth metal carbonates in the precipitation device to produce a precipitated slurry.
  • Patent document 4 (US Pat. No. 1,085,021) describes a method for sequestering carbon dioxide and producing magnesium carbonate, the method comprising: thermally pretreating a magnesium-containing granular material, in which 90% of the solid particles have a particle size of about 75 ⁇ m or less, for dehydroxylation to produce a pretreated magnesium-containing granular material; contacting the pretreated magnesium-containing granular material with water and a carbon dioxide-containing gas to form a carrier slurry and a carbon dioxide-depleted gas; separating the carrier slurry from the carbon dioxide-depleted gas; separating the carrier slurry into at least a carrier aqueous stream and a solids-rich stream; precipitating the carrier aqueous stream to form a precipitate slurry comprising magnesium carbonate precipitate; and separating the precipitate slurry to produce a precipitated magnesium carbonate material and a precipitate-depleted stream.
  • CO 2 fixation using alkaline earth metal-containing solids has problems such as requiring a large amount of alkaline earth metal-containing solids as an alkaline earth metal source, low throughput of CO 2 fixation, and requiring a large or multi-stage reaction vessel.
  • the installation area becomes large, so it is difficult to adopt such a layout in factories with limited installation space.
  • the present disclosure provides a CO2 fixation method and a CO2 fixation apparatus that can efficiently extract alkaline earth metals from alkaline earth metal-containing solids into a liquid phase while reducing the installation area of equipment related to the extraction step, and can reduce costs related to raw materials , equipment, operation , etc.
  • the present inventors have found that by stirring and mixing a slurry containing alkaline earth metal-containing particles and an aqueous medium with a CO2 source in a stirring tank, alkaline earth metal ions can be extracted from the alkaline earth metal-containing particles into a liquid phase, the slurry in the stirring tank is supplied to a grinding device to grind the alkaline earth metal-containing particles in the slurry, and the slurry containing the ground alkaline earth metal-containing particles is supplied again to the stirring tank, thereby making it possible to highly efficiently extract alkaline earth metal ions into the liquid phase even if the installation area of the equipment related to the extraction step is small.
  • a method for producing a mixture in which an alkaline earth metal-containing particle is extracted into a liquid phase by stirring and mixing a slurry containing alkaline earth metal-containing particles and an aqueous medium with a CO2 source selected from the group consisting of CO2 gas, CO2-saturated water, and combinations thereof in a stirring tank; extracting the slurry containing the alkaline earth metal-containing particles from the stirring tank and supplying it to a grinding device; grinding the alkaline earth metal-containing particles in the grinding device; supplying a slurry containing the pulverized alkaline earth metal-containing particles to the stirring tank; subjecting the mixture removed from the stirring tank to solid-liquid separation to obtain a liquid phase containing the alkaline earth metal ions and a solid phase containing an extraction residue; and precipitating an alkaline earth metal carbonate from the liquid phase containing the alkaline earth metal ions, thereby immobilizing CO2 in the alkaline earth metal carbonate.
  • a CO2 source selected from the group consisting
  • Aspect 5 The method according to any one of aspects 2 to 4, comprising precipitating an alkaline earth metal carbonate from a light fraction liquid phase obtained by solid-liquid separation of the light fraction, and fixing CO2 in the alkaline earth metal carbonate; and supplying the liquid phase separated by the precipitation to the stirring tank.
  • the grinding device is a wet mill, an attrition pump, an electric pulse grinding device, an impulse grinding device, or a high pressure jet nozzle grinding device.
  • Aspect 7 Aspect 7. The method of any one of aspects 1 to 6, comprising providing an alkaline earth metal-containing feedstock to the grinding apparatus.
  • a stirring tank having a CO2 gas supply port, a first slurry supply port, and a first slurry discharge port; a grinding device including a second slurry supply port connected to the first slurry discharge port of the stirring tank, and a second slurry supply port connected to the first slurry supply port of the stirring tank, the grinding device being configured to grind the alkaline earth metal-containing particles in a slurry containing alkaline earth metal-containing particles and an aqueous medium, the slurry being extracted from the stirring tank through the first slurry discharge port and supplied through the second slurry supply port, discharge the ground slurry containing the alkaline earth metal-containing particles through the second slurry discharge port, and supply the ground slurry to the stirring tank through the first slurry supply port;
  • a CO2 fixation device comprising: [Aspect 13] The CO2 fixation apparatus further includes a classification device disposed between the first slurry discharge outlet of the stirring tank and the second slurry supply inlet of the grinding device,
  • the CO2 fixation device further includes a solid-liquid separation device connected to the classification device, and a precipitation tank connected to the solid-liquid separation device;
  • the solid-liquid separation device includes a light fraction supply port, a first liquid phase discharge port, and a first solid phase discharge port, the precipitation tank has a liquid phase inlet, a second liquid phase outlet, and a second solid phase outlet;
  • the light fraction supply port of the solid-liquid separation device is connected to the light fraction discharge port of the classification device, and the first liquid phase discharge port is connected to the liquid phase supply port of the precipitation tank;
  • the CO2 fixation apparatus according to aspect 14, further comprising a gas-liquid mixer disposed between the CO2 gas supply port of the stirring tank and the second liquid phase discharge port of the precipitation tank.
  • the grinding device is a wet mill, an attrition pump, an electric pulse grinding device, an impulse grinding device, or a high-pressure jet nozzle grinding device.
  • alkaline earth metals can be extracted from alkaline earth metal-containing particles into a liquid phase with high efficiency while reducing the installation area of the equipment involved in the extraction process, thereby reducing costs associated with raw materials, equipment, operations, etc.
  • FIG. 1 is a flow chart for explaining an overview of a CO2 fixation method according to one embodiment.
  • FIG. 2 is a flow chart for explaining an overview of a CO 2 fixation method according to another embodiment.
  • FIG. 2 is a flow chart for explaining an overview of a CO 2 fixation method according to another embodiment.
  • FIG. 1 is a schematic diagram of a CO2 fixation device according to one embodiment.
  • FIG. 1 is a flow diagram illustrating an overview of a method for recovering valuable metals in combination with a CO2 fixation method.
  • FIG. 2 is a flow diagram outlining the HPAL process.
  • FIG. 2 is a top view showing an exemplary equipment layout for the extraction process of one embodiment of a CO 2 fixation device.
  • FIG. 1 is a top view showing an exemplary equipment layout for the extraction process of a CO 2 fixation device using a multi-stage wet mill.
  • CO2 fixation method In one embodiment of the CO2 fixation method, (1) In a stirring tank, a slurry containing alkaline earth metal-containing particles and an aqueous medium is stirred and mixed with a CO2 source selected from the group consisting of CO2 gas, CO2- saturated water, and combinations thereof.
  • a CO2 source selected from the group consisting of CO2 gas, CO2- saturated water, and combinations thereof.
  • FIG. 1 shows an outline of a CO2 fixation method according to an embodiment in a flow diagram.
  • the parts enclosed by squares indicate steps or devices.
  • alkaline earth metal-containing particles are obtained by pretreating the alkaline earth metal-containing raw material.
  • An aqueous medium is added to the alkaline earth metal-containing particles to obtain a slurry.
  • a mixture in which the alkaline earth metal ions in the alkaline earth metal-containing particles are extracted into the liquid phase is produced.
  • the slurry containing the alkaline earth metal-containing particles is extracted from the stirring tank and fed to a grinding device, and the alkaline earth metal-containing particles are ground in the grinding device, and the slurry is then fed back to the stirring tank.
  • the contact interface area between the alkaline earth metal-containing particles and the liquid phase can be increased, or the reaction surface of the alkaline earth metal-containing particles can be renewed. As a result, the extraction efficiency of the alkaline earth metal can be improved.
  • the extraction step and the pulverization step are performed in separate devices (a stirring tank and a pulverization device), so that the installation area of the equipment for the extraction step can be reduced while the alkaline earth metal can be extracted from the alkaline earth metal-containing particles into the liquid phase with high efficiency. Then, the mixture in which the alkaline earth metal ions are extracted into the liquid phase is subjected to solid-liquid separation to obtain a liquid phase containing the alkaline earth metal ions and a solid phase containing the extraction residue. The alkaline earth metal carbonate is precipitated from the liquid phase, and CO2 is fixed in the alkaline earth metal carbonate.
  • Extraction Step By stirring and mixing a slurry containing alkaline earth metal-containing particles and an aqueous medium with a CO2 source selected from the group consisting of CO2 gas, CO2- saturated water, and combinations thereof, the alkaline earth metal ions in the alkaline earth metal-containing particles are extracted into a liquid phase.
  • a CO2 source selected from the group consisting of CO2 gas, CO2- saturated water, and combinations thereof
  • alkaline earth metal-containing particles are not particularly limited as long as they contain an alkaline earth metal.
  • "alkaline earth metal” refers to an element of Group 2 of the periodic table.
  • the alkaline earth metal is preferably at least one selected from the group consisting of Mg, Ca, Sr, and Ba, more preferably at least one selected from the group consisting of Mg and Ca, even more preferably containing Mg, and particularly preferably Mg.
  • alkaline earth metal-containing particles examples include particles of Mg-containing ore, Mg-containing slag, Ca-containing slag, coal ash, clinker kiln dust, waste concrete, concrete sludge, and cement.
  • the alkaline earth metal-containing particles are particles of Mg-containing ore.
  • Mg-containing ores include limonite (MgO content 0.5 to 5% by mass), smectite (MgO content 5 to 15% by mass), and saprolite (MgO content 15 to 35% by mass).
  • the Mg-containing ore preferably contains ultramafic rock, and preferably contains at least one mineral selected from the group consisting of olivine (composition formula: (Mg, Fe) SiO 4 ) and serpentine (composition formula: (Mg, Fe) 3 Si 2 O 5 (OH) 4 ). Since olivine and serpentine are high Mg-containing minerals, the amount of alkaline earth metal-containing particles required for CO 2 fixation can be reduced.
  • the alkaline earth metal-containing particles preferably contain magnesium silicate.
  • Mg is contained in large amounts in the form of magnesium silicate. Therefore, alkaline earth metal-containing particles containing magnesium silicate are advantageous in that CO2 fixation can be performed more cheaply and easily.
  • the alkaline earth metal-containing particles may be formed by pre-treating an alkaline earth metal-containing raw material.
  • the alkaline earth metal-containing raw material may be a material described for the alkaline earth metal-containing particles, such as Mg-containing ore, Mg-containing slag, Ca-containing slag, coal ash, clinker kiln dust, waste concrete, concrete sludge, or cement.
  • Pretreatments include, for example, grinding and heat treatment.
  • the grinding can be carried out using a known grinding device.
  • the grinding can reduce the average particle size of the alkaline earth metal-containing particles to increase their surface area, or expose the active surfaces of the alkaline earth metal-containing particles. This can increase the extraction efficiency of the alkaline earth metal.
  • the grinding can be carried out under conditions such that the alkaline earth metal-containing particles have a suitable average particle size, which will be described later. If necessary, the alkaline earth metal may be classified using a sieve or the like after grinding.
  • the heat treatment can be carried out using a known heat treatment device.
  • the heat treatment temperature can be, for example, 500°C to 800°C, and the heat treatment time can be 1 minute to 2 hours.
  • the alkaline earth metal-containing particles are heat-treated.
  • the crystal water in the alkaline earth metal-containing raw material can be removed, and the alkaline earth metal in the alkaline earth metal-containing particles can be activated to a form that is easily eluted into the liquid phase, thereby increasing the extraction efficiency of the alkaline earth metal.
  • the smaller the particle size the easier it is for heat to be transmitted to the inside of the particle, and the greater the efficiency of the heat treatment, so it is preferable to carry out the heat treatment after the above-mentioned crushing.
  • pretreatment equipment equipment used for pretreatment, such as grinding equipment and heat treatment equipment, is collectively referred to as pretreatment equipment.
  • the average particle size of the alkaline earth metal-containing particles can be appropriately determined according to the volume of the stirring tank, the type and output of the stirrer provided in the stirring tank, the type and size of the grinding device, etc., and is not particularly limited.
  • the average particle size of the alkaline earth metal-containing particles can be, for example, within the range of 10 ⁇ m to 500 ⁇ m, 20 ⁇ m to 450 ⁇ m, or 100 ⁇ m to 400 ⁇ m. By setting the average particle size of the alkaline earth metal-containing particles to 10 ⁇ m or more, solid-liquid separation in CO 2 fixation can be facilitated.
  • the average particle size of the alkaline earth metal-containing particles is defined as the 50% cumulative volume average diameter D 50 by the laser diffraction scattering method.
  • the aqueous medium has the ability to dissolve CO2 and is generally water.
  • the aqueous medium may contain water-soluble organic solvents such as alcohols and esters as necessary. Salts such as sodium chloride, potassium chloride, ammonium chloride, sodium sulfate, magnesium sulfate, ammonium hydrogen sulfate, and sodium hydrogen carbonate may be dissolved in the aqueous medium.
  • the content of water in the aqueous medium is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more.
  • the slurry can be prepared by adding alkaline earth metal-containing particles to an aqueous medium and mixing.
  • the slurry supplied as a raw material contains 0.5% to 50% by mass of alkaline earth metal-containing particles.
  • the lower the content of alkaline earth metal-containing particles in the slurry the greater the ratio of the liquid phase to the solid phase (alkaline earth metal-containing particles), so the extraction rate of the alkaline earth metal increases, but a larger facility is required for extraction.
  • the higher the content of alkaline earth metal-containing particles in the slurry the smaller the facility required for extraction, but the lower the extraction efficiency of the alkaline earth metal.
  • the slurry does not contain any acid added from outside other than the CO 2 source.
  • the CO2 source is selected from the group consisting of CO2 gas, CO2 saturated water, and combinations thereof. That is, in the extraction process, (1) only CO2 gas is introduced into the stirring tank, (2) only CO2 saturated water is introduced into the stirring tank, or (3) both CO2 gas and CO2 saturated water are introduced into the stirring tank.
  • Examples of the CO2 gas supply source include at least one selected from the group consisting of a coal power plant, an oil power plant, a natural gas power plant, a biomass power plant, a coal boiler, a smelting facility, a neutralization facility, and a roasting facility. Since a coal power plant has a particularly large amount of CO2 gas emissions, the CO2 gas emissions can be effectively reduced by using the CO2 fixation method described later.
  • the roasting facility as the CO2 gas supply source may be one used in the roasting process described later.
  • the CO2 gas may be directly introduced into the stirring tank, or may be introduced into the stirring tank after mixing the CO2 gas in water or an aqueous medium by bubbling or the like, or may be a combination of direct introduction and mixed introduction.
  • the water or aqueous medium is preferably one produced in another process of the CO2 fixation method, for example, a light liquid phase produced in the classification process described later, or a liquid phase produced in the precipitation process. This allows the amount of water used in the CO2 fixation method to be reduced.
  • the source of CO2 saturated water is not particularly limited, but may be, for example, a CO2 recovery system from CO2 exhaust gas using an amine or a solid adsorbent.
  • CO2 -containing water is generated in which CO2 contained in the exhaust gas is dissolved to a saturated concentration, and this CO2- containing water can be used as CO2 saturated water.
  • CO2 saturated water means CO2-containing water whose dissolved CO2 concentration (g/100 cm3 ) is 90% or more, preferably 95% or more, more preferably 98% or more of the solubility of CO2 in water (g/100 cm3 ) at the time of supply to the stirring tank, and also includes supersaturated CO2 - containing water.
  • the supply rate of the CO 2 source can be optimized in consideration of design factors such as the saturation solubility of CO 2 , extraction efficiency, power required for supply, volume of the stirring tank, and output of the stirrer provided in the stirring tank. It is preferable to determine the supply rate of the CO 2 source so that the amount of CO 2 dissolved in the liquid phase of the slurry is saturated at the temperature and pressure during stirring.
  • the alkaline earth metal ions in the alkaline earth metal-containing particles are extracted into the liquid phase.
  • CO2 dissolves in the liquid phase of the slurry, and the pH of the liquid phase decreases. This promotes the dissolution and ionization of the alkaline earth metal in the alkaline earth metal-containing particles into the liquid phase.
  • a tank equipped with a stirring device having a stirring blade and a motor can be used as the stirring tank.
  • the stirring tank may be equipped with a temperature control mechanism or may be a sealed container equipped with a mechanism for pressurizing the internal atmosphere.
  • the stirring and mixing is performed at a temperature of not less than the freezing point of the aqueous medium and not more than 50°C, preferably 0°C to 30°C. If the slurry contains a soluble substance, such as sodium chloride, the freezing point of the aqueous medium may drop below 0°C.
  • the stirring and mixing can be performed uniformly and an excessive increase in power consumption associated with the stirring and mixing can be prevented.
  • the stirring and mixing is performed at ambient temperature without heating.
  • stirring and mixing is performed under a pressure atmosphere of atmospheric pressure or more and 10 MPaG (gauge pressure) or less, preferably 1.0 MPaG (gauge pressure) or less, more preferably 0.5 MPaG (gauge pressure) or less.
  • the higher the CO2 pressure the more CO2 dissolves in the liquid phase of the slurry, and therefore the extraction efficiency of the alkaline earth metal is higher.
  • the alkaline earth metal ions in the alkaline earth metal-containing particles can be efficiently extracted into the liquid phase.
  • stirring is performed under an atmospheric pressure atmosphere.
  • the stirring time of the slurry can be set appropriately depending on the extraction efficiency, and is not particularly limited, but can be, for example, 20 minutes to 2 hours.
  • the alkaline earth metal ions extracted into the liquid phase may be present in the form of alkaline earth metal hydroxide, alkaline earth metal silicate, or alkaline earth metal silicate double salt.
  • alkaline earth metal hydroxides include Mg(OH) 2 and Ca(OH) 2 , which are generated by hydration of MgO or CaO .
  • alkaline earth metal silicate include Mg2SiO4 (magnesium silicate ) and Ca2SiO4 .
  • alkaline earth metal silicate double salts include, for example, silicates of alkaline earth metals and alkali metals, Mn, Fe, Co, Ni, Cu, Zn, or Al, or two or more of these.
  • a representative alkaline earth metal silicate double salt is (Mg,Fe) SiO4 (mafic silicate).
  • the alkaline earth metal ions are present in the form of alkaline earth metal silicates or alkaline earth metal double silicates, which are converted to alkaline earth metal carbonates during CO2 fixation.
  • the alkaline earth metal-containing particles contained in the slurry are pulverized in a pulverizer.
  • a pulverizer a wet mill, an attrition pump, an electric pulse pulverizer, an impulse pulverizer, or a high-pressure jet nozzle pulverizer is preferably used.
  • the electric pulse pulverizer or the impulse pulverizer can also pulverize the grain boundary interface of the alkaline earth metal-containing particles, which is more advantageous in terms of increasing the extraction efficiency.
  • the grinding time can be set appropriately depending on the type and size of the grinding device, and is not particularly limited, but can be, for example, 2 to 30 minutes.
  • an alkaline earth metal-containing raw material may be supplied to the grinding device. This allows preparation of new slurry containing alkaline earth metal-containing particles in parallel with the grinding of the alkaline earth metal-containing particles contained in the slurry extracted from the stirring tank in the grinding device.
  • the alkaline earth metal-containing raw material may be pretreated as described above, for example, by grinding or heat treatment.
  • Steps (1) to (4) may be performed continuously or sequentially. When steps (1) to (4) are performed sequentially, they may be performed on the entire amount of the slurry, or the slurry may be divided into two or more portions. When steps (1) to (4) are performed sequentially, a set of steps (1) to (4) may be performed once, or a set of steps (1) to (4) may be repeated multiple times. In one embodiment, steps (1) to (4) are performed continuously, i.e., the extraction step and the grinding step are performed in parallel.
  • Solid-liquid separation step The mixture in which the alkaline earth metal ions are extracted into the liquid phase is subjected to solid-liquid separation to produce a liquid phase containing the alkaline earth metal ions and a solid phase containing the extraction residue.
  • the solid phase of the mixture may contain alkaline earth metal-containing particles as residue. Examples of the solid-liquid separation method include filtration, pressing, sedimentation, and centrifugation.
  • Solid-liquid separation can be carried out using a general solid-liquid separation device.
  • solid-liquid separation devices include vacuum separation devices, centrifugal separators, multiple disk separators, belt presses, screw presses, roller presses, rotary drum screens, belt screens, vibrating screens, thickeners, ceramic filters, pleated filters, and multiple plate wave filters.
  • Precipitation Step By precipitating alkaline earth metal carbonate from a liquid phase containing alkaline earth metal ions, CO2 is fixed in the alkaline earth metal carbonate.
  • the solubility of alkaline earth metal carbonate decreases as the temperature increases. Therefore, the precipitation of alkaline earth metal carbonate can be promoted by increasing the temperature of the liquid phase.
  • the precipitation of alkaline earth metal carbonate can also be performed by bubbling the liquid phase with air, or by placing the liquid phase under reduced pressure.
  • a tank equipped with a temperature control mechanism can be used as the precipitation tank.
  • the precipitation tank may be equipped with piping and nozzles for air bubbling, and may also be equipped with a vacuum pump.
  • the temperature of the liquid phase in the precipitation process can be, for example, 0°C to 80°C, or 20°C to 80°C.
  • the precipitation time can be, for example, 10 minutes to 5 hours.
  • the precipitated alkaline earth metal salt may be separated from the liquid phase.
  • step (2) a slurry containing alkaline earth metal-containing particles is extracted from the stirring tank, the slurry containing the alkaline earth metal-containing particles is separated into a light fraction and a heavy fraction in a classification device, and the heavy fraction is supplied to a crushing device.
  • the content of alkaline earth metals in the particles contained in the light fraction is smaller than that in the heavy fraction.
  • the particles contained in the light fraction contain, for example, silicon dioxide (SiO 2 ) as a component.
  • SiO 2 silicon dioxide
  • the liquid phase of the light fraction contains ions of alkaline earth metals, it is preferable to supply the light fraction liquid phase obtained by solid-liquid separation of the light fraction to the stirring tank. This allows the alkaline earth metals contained in the alkaline earth metal-containing raw material to be more effectively used for CO 2 fixation.
  • the light fraction solid phase containing particles is sent to a valuable metal recovery facility if it contains valuable metals, or to post-treatment such as residue treatment if it does not contain valuable metals.
  • the fluctuation of the dissolved CO2 concentration in the slurry in the stirring tank which may occur when the light liquid phase is supplied to the stirring tank, can be suppressed, and the extraction process can be stably carried out.
  • Mixing of CO2 gas into the light liquid phase can be performed, for example, by inserting a CO2 gas introduction nozzle into the piping of the light liquid phase and bubbling CO2 gas into the light liquid phase, or by providing an in-line mixer in the middle of the piping and supplying CO2 gas to the in-line mixer.
  • step (2) a slurry containing alkaline earth metal-containing particles is extracted from the stirring tank, the slurry containing the alkaline earth metal-containing particles is separated into a light fraction and a heavy fraction in a classification device, the light fraction is subjected to solid-liquid separation to obtain a light fraction liquid phase, and an alkaline earth metal carbonate is precipitated from the light fraction liquid phase to fix CO2 in the alkaline earth metal carbonate, and the liquid phase separated by the precipitation is supplied to the stirring tank.
  • FIG. 3 shows an outline of the CO 2 fixation method of this embodiment in a flow diagram.
  • the light fraction separated in the classification device is separated into a light fraction liquid phase and a light fraction solid phase by solid-liquid separation in step (5).
  • CO 2 fixation is performed by precipitating alkaline earth metal carbonate from the light fraction liquid phase containing alkaline earth metal ions.
  • the liquid phase separated by precipitation is supplied to the stirring tank.
  • the concentration of alkaline earth metal ions in the slurry in the stirring tank is prevented from becoming excessively high, thereby increasing the extraction efficiency in the stirring tank and increasing the throughput of CO 2 fixation. This effect is particularly remarkable when a large amount of alkaline earth metal ions are dissolved in the light fraction liquid phase.
  • the amount of water used in the CO 2 fixation method can be reduced.
  • the CO2 fixation method may be carried out by combining Modification 1 and Modification 2.
  • the concentration of alkaline earth metal ions in the light fraction liquid phase obtained by classifying a slurry containing alkaline earth metal-containing particles is less than a predetermined value
  • the light fraction liquid phase after solid-liquid separation is supplied to a stirring tank, i.e., to step (1) (extraction step), and when the concentration is equal to or greater than a predetermined value, the light fraction liquid phase after solid-liquid separation is sent to step (6) (precipitation step), thereby further increasing the extraction efficiency in the stirring tank and the throughput of CO2 fixation.
  • the CO2 fixation device of one embodiment includes a stirring tank having a CO2 gas supply port, a first slurry supply port, and a first slurry discharge port;
  • the grinding device includes a slurry supply port and a second slurry discharge port connected to the first slurry supply port of the mixing tank.
  • the grinding device is withdrawn from the mixing tank through the first slurry discharge port,
  • the alkaline earth metal-containing particles in the slurry containing the alkaline earth metal-containing particles and the aqueous medium supplied through the second slurry supply port are pulverized, and the pulverized slurry containing the alkaline earth metal-containing particles is referred to as a second slurry.
  • the slurry is discharged through a discharge port and supplied to the stirring tank through a first slurry supply port.
  • the stirring tank 10 is provided with a CO2 gas supply port 11, a first slurry supply port 12, and a first slurry discharge port 13.
  • the stirring tank 10 is provided with a stirring device having a stirring blade and a motor M.
  • the pipe for introducing the CO2 source extends below the slurry liquid surface through the CO2 gas supply port 11, and the CO2 source is introduced into the slurry from a nozzle provided at the end or midway of the pipe.
  • the slurry is stirred and mixed with the CO2 source, and the alkaline earth metal ions in the alkaline earth metal-containing particles are extracted into the liquid phase of the slurry.
  • the grinding device 20 has a second slurry supply port 22 and a second slurry discharge port 23.
  • the second slurry supply port 22 is connected to the first slurry discharge port 13 of the stirring tank 10 via a pump.
  • the second slurry discharge port 23 is connected to the first slurry supply port 12 of the stirring tank 10 via a pump.
  • the slurry in the stirring tank 10 is extracted through the first slurry discharge port 13 and supplied to the grinding device 20 through the second slurry supply port 22.
  • the alkaline earth metal-containing particles in the slurry are ground in the grinding device 20.
  • the slurry containing the ground alkaline earth metal-containing particles is discharged through the second slurry discharge port 23 and supplied to the stirring tank 10 through the first slurry supply port 12.
  • the grinding device 20 is preferably a wet mill, an attrition pump, an electric pulse crushing device, an impulse crushing device, or a high-pressure jet nozzle crushing device, and more preferably an electric pulse crushing device or an impulse crushing device
  • FIG. 4 further shows a solid-liquid separator 40 connected to the classification device 30, and a precipitation tank 50 connected to the solid-liquid separator 40.
  • the solid-liquid separation device 40 has a light fraction supply port 42, a first liquid phase discharge port 43, and a first solid phase discharge port 44.
  • the light fraction supply port 42 of the solid-liquid separation device 40 is connected to the light fraction discharge port 34 of the classification device 30, and the light fraction is supplied from the classification device 30 to the solid-liquid separation device 40.
  • the light fraction is separated into a light fraction liquid phase and a light fraction solid phase in the solid-liquid separation device 40, and the light fraction solid phase is discharged from the first solid phase discharge port 44.
  • the solid-liquid separation device 40 is, for example, a vacuum separation device, a centrifugal separator, a multiple disk separation device, a belt press, a screw press, a roller press, a rotary drum screen, a belt screen, a vibrating screen, a thickener, a ceramic filter, a pleated filter, or a multiple plate wave filter.
  • the precipitation tank 50 includes a liquid phase supply port 52, a second liquid phase discharge port 53, and a second solid phase discharge port 54.
  • the first liquid phase discharge port 43 of the solid-liquid separation device 40 is connected to the liquid phase supply port 52 of the precipitation tank 50, and the light liquid phase separated in the solid-liquid separation device 40 is supplied to the precipitation tank 50 through the first liquid phase discharge port 43 and the liquid phase supply port 52.
  • the precipitation tank 50 includes a temperature control mechanism, and alkaline earth metal carbonates are precipitated from the light liquid phase by raising the temperature of the liquid phase.
  • the alkaline earth metal carbonates are recovered from the second solid phase discharge port 54.
  • the precipitation tank 50 may include an air bubbling mechanism or a vacuum pump in addition to or instead of the temperature control mechanism.
  • the second liquid phase discharge port 53 of the precipitation tank 50 is connected to the stirring tank 10.
  • the amount of water used for CO 2 fixation can be reduced.
  • a storage tank 70 and a pump are disposed between the second liquid phase outlet 54 and the stirring tank 10.
  • the storage tank 70 can temporarily store the liquid phase in order to adjust the amount of the liquid phase supplied to the stirring tank 10.
  • the gas-liquid mixer 60 is connected to a CO2 gas supply source 80 via a compressor 82 and a storage tank 84.
  • the CO2 gas from the CO2 gas supply source 80 is compressed by the compressor 82 and temporarily stored in the storage tank 84.
  • the CO2 gas is supplied from the storage tank 84 to the gas-liquid mixer 60, mixed with the liquid phase sent from the precipitation tank 50 in the gas-liquid mixer 60, and then supplied to the stirring tank 10.
  • the gas-liquid mixer 60 is, for example, an in-line mixer, a microbubble generator, an aeration tube, an ejector, or an aerator.
  • the pretreatment device 90 for pretreating the alkaline earth metal-containing raw material.
  • the alkaline earth metal-containing raw material pretreated in the pretreatment device 90 is supplied into the grinding device 20 from the raw material supply port 24 provided in the grinding device 20, pulverized in the grinding device 20, and added to the slurry extracted from the stirring tank 10. It is also possible to prepare a starting slurry containing alkaline earth metal-containing particles and an aqueous medium used for CO2 fixation by supplying an aqueous medium to the grinding device 20 instead of the slurry extracted from the stirring tank 10 and pulverizing the alkaline earth metal-containing raw material in the aqueous medium.
  • the pretreatment device 90 is, for example, a grinding device, a heat treatment device, or a combination thereof.
  • a method for fixing CO 2 and recovering valuable metals includes pretreating an alkaline earth metal-containing raw material containing valuable metals and alkaline earth metals to obtain alkaline earth metal-containing particles and a valuable metal-containing residue; carrying out the CO 2 fixation method using the alkaline earth metal-containing particles; and recovering a product, intermediate, or both containing valuable metals from the valuable metal-containing residue.
  • FIG. 5 shows a flow diagram of an outline of a valuable metal recovery method combined with a CO2 fixation method.
  • alkaline earth metal-containing particles and valuable metal-containing residue are produced from the starting material, and these are each supplied to a separate subsequent step.
  • the alkaline earth metal-containing particles are used for CO2 fixation to produce alkaline earth metal carbonate.
  • the extraction residue may also be used as a valuable metal-containing residue.
  • alkaline earth metal-containing particles and valuable metal-containing residues are obtained from the starting material.
  • the starting materials include valuable metals and alkaline earth metals.
  • the form of the starting materials is not particularly limited, and may be, for example, ores, solutions, slurry, powders, lumps, or molded bodies.
  • the powders and lumps can be obtained, for example, by crushing the ores, or by drying and crushing the solutions or slurry.
  • the powders or lumps may be dried by evaporating and removing the free water.
  • the molded bodies can be obtained, for example, by tableting the ores, powders, or lumps.
  • the molded bodies may be mixed with agents used in pretreatment, such as fuel for roasting.
  • the starting material is an ore containing the valuable metal.
  • such ores include nickel oxide ore, nickel sulfide ore, cobalt ore, iron ore, copper ore, platinum ore, and metal concentrates obtained by flotation of any one or more of these ores.
  • the ore is preferably nickel oxide ore.
  • nickel oxide ores include limonite (MgO content: 0.5 to 5% by mass), smectite (MgO content: 5 to 15% by mass), and saprolite (MgO content: 15 to 35% by mass).
  • the alkaline earth metal preferably contains Mg.
  • the starting material comprises ultramafic rock, which preferably comprises at least one mineral selected from the group consisting of olivine (composition formula: (Mg, Fe)SiO 4 ) and serpentine (composition formula: (Mg, Fe) 3 Si 2 O 5 (OH) 4 ).
  • the pretreatment in the valuable metal recovery method includes a process for changing the chemical composition or chemical properties of the starting material to enable separation into alkaline earth metal-containing particles and valuable metal-containing residue. Examples of such processes include oxidizing roasting, sulfating roasting, and salt conversion/solid-liquid separation.
  • the pretreatment in the valuable metal recovery method may further include pulverization, heat treatment, or a combination thereof, as described above with respect to the pretreatment in the CO2 fixation method.
  • the oxidative roasting can be carried out, for example, using a roasting furnace.
  • An exemplary oxidative roasting method includes the following steps: Using fuel such as natural gas, petroleum, coal, sulfur, or pyrite (FeS 2 ), oxygen partial pressure is increased by supplying oxygen, air, or the like, and the starting material is heated to about 500°C to 700°C for oxidative decomposition.
  • the alkaline earth metal is converted to an alkaline earth metal oxide and recovered as alkaline earth metal-containing particles.
  • high Mg-containing minerals such as olivine and serpentine are thermally decomposed into MgO and SiO 2 by oxidative roasting.
  • This pyrolysis product may also contain Fe 2 O 3 , Mg 2 SiO 4 , (Mg,Fe)SiO 4 , or a combination thereof. Valuable metals are also recovered in the form of oxides as valuable metal-containing residues.
  • Sulfation roasting can be carried out, for example, using a rotary kiln, a fluidized bed heating furnace, or an electric furnace.
  • An exemplary sulfation roasting includes the following steps: Sulfur or a sulfur compound such as sodium sulfide, calcium sulfide, pyrrhotite, or pyrite is mixed with the starting material as a reduction promoter, and the starting material is heated to a reduction range of the valuable metal, for example, about 400°C to 680°C for Ni, to selectively sulfate the valuable metal.
  • metal sulfides are formed using H 2 S gas or the like, or valuable metal hydroxides are formed by adjusting the pH using an alkali such as Ca(OH) 2 or NaOH, and then the alkaline earth metal-containing particles and valuable metal-containing residue can be separated by solid-liquid separation.
  • Another exemplary sulfation roasting includes adding concentrated sulfuric acid to the starting material, and then performing oxidative roasting to sulfate the valuable metal.
  • the salt conversion and solid-liquid separation can be carried out, for example, using hot water or an acidic aqueous solution such as sulfuric acid, hydrochloric acid, or nitric acid.
  • An exemplary method includes the following steps: The starting material is placed in a container, and hot water or an acidic aqueous solution such as sulfuric acid, hydrochloric acid, or nitric acid is added to dissolve the alkaline earth metals and valuable metals in the form of their salts. After the addition of the hot water or acidic aqueous solution, an oxidizing agent such as H 2 O 2 or KMnO 4 may be added and stirred to promote dissolution of the alkaline earth metals or valuable metals.
  • an oxidizing agent such as H 2 O 2 or KMnO 4 may be added and stirred to promote dissolution of the alkaline earth metals or valuable metals.
  • the dissolved alkaline earth metals and valuable metals can be separated into alkaline earth metal-containing particles and valuable metal-containing residue by solid - liquid separation after forming metal sulfides using H 2 S gas or the like, or forming valuable metal hydroxides by adjusting the pH using an alkali such as Ca(OH) 2 or NaOH.
  • Pretreatment preferably includes oxidative roasting.
  • the mixture of alkaline earth metal oxides and valuable metal oxides obtained by oxidative roasting the starting material can be easily separated by a separation process such as specific gravity separation.
  • pretreatment may include exhaust gas treatment of sulfur dioxide.
  • a general sulfuric acid plant can be used as an exhaust gas treatment facility for sulfur dioxide.
  • the concentrated sulfuric acid generated by the exhaust gas treatment of sulfur dioxide can be effectively used as a product or in valuable metal recovery by the method disclosed herein, particularly valuable metal recovery using the high pressure acid leaching (HPAL) method.
  • HPAL high pressure acid leaching
  • the pretreatment may further include a separation step.
  • separation methods include specific gravity separation, particle size separation, and chemical composition separation.
  • Specific gravity separation is a method of separating particles by utilizing the difference in specific gravity when the specific gravity of particles differs depending on the chemical composition. Specific gravity separation can be performed, for example, using a fluidized specific gravity separation device used in coal preparation technology.
  • Particle size separation is a method of separating particles by utilizing the difference in particle size when the concentration of valuable metals present in particles differs depending on the size of the particles, or when valuable metals in minerals exist in the form of fine particles. Particle size separation can be performed, for example, using a sieve or a centrifuge.
  • Chemical composition separation is a method of separating particles containing special metals such as uranium by analyzing such particles online using infrared rays and selectively blowing away only the particles with an air gun.
  • the pretreatment preferably includes separating alkaline earth metal-containing particles and valuable metal-containing residue by gravity separation.
  • the gravity separation device for example, when the specific gravity is set to 4, substances with low specific gravity such as MgO and SiO2 can be separated as alkaline earth metal-containing particles, and substances with high specific gravity containing valuable metals such as NiO, CoO, and Fe2O3 can be separated as valuable metal-containing residue.
  • the alkaline earth metal-containing particles obtained by the pretreatment may contain, in addition to the alkaline earth metal, other elements such as silicon, aluminum, or two or more of these.
  • the alkaline earth metal and other elements may be present in the alkaline earth metal-containing particles in the form of oxides, sulfates , silicates, or combinations thereof.
  • the alkaline earth metal-containing particles include MgO, SiO2 , and Mg2SiO4 .
  • the valuable metal-containing residue may contain, in addition to the valuable metal, for example, silicon, aluminum, or two or more of these elements.
  • the valuable metal may be present in the valuable metal-containing residue in the form of an oxide, a chloride, a sulfide, or a combination thereof.
  • the valuable metal-containing residue contains at least one selected from the group consisting of NiO, CoO, and Fe2O3 .
  • the CO2 fixation using alkaline earth metal-containing particles is as described in the CO2 fixation method.
  • the heat generated in the pretreatment for example, the roasting process, can be reused as a heat source for heating the liquid phase.
  • the CO2 emission associated with heating can be reduced or eliminated.
  • the alkaline earth metal carbonate produced can be used as an alkaline earth metal carbonate product, or when valuable metal recovery in the method disclosed herein is performed by high pressure acid leaching (HPAL), it can be used as a neutralizing agent for primary neutralization, final neutralization, or pH adjustment of both, which are subsequent steps in the HPAL process.
  • HPAL high pressure acid leaching
  • MgCO3 generated by CO2 fixation
  • the Mg contained in MgCO3 used as a neutralizing agent is converted to the form of MgSO4 and exists in the liquid phase of the tailings dam. Since there are no strict regulations regarding the release of Mg ions into the ocean, the tailings dam can be treated at low cost.
  • the CO2 gas regenerated in these neutralizations can also be collected and reused for the above-mentioned CO2 fixation.
  • the liquid phase separated from the alkaline earth metal carbonate may be used as cooling water for other equipment, or as water or an aqueous solution for slurrying alkaline earth metal-containing particles.
  • valuable metal-containing products In valuable metal recovery, valuable metal-containing products, valuable metal-containing intermediates, or both are recovered from valuable metal-containing residues.
  • valuable metal-containing products include nickel sulfate, cobalt sulfate, cobalt chloride, metallic nickel, and metallic cobalt.
  • valuable metal-containing intermediates include mixed sulfide precipitate (MSP) and mixed hydroxide precipitate (MHP).
  • Valuable metal-containing products such as nickel sulfate, cobalt sulfate, and cobalt chloride can be produced by refining valuable metal-containing intermediates.
  • Valuable metal-containing products such as metallic nickel and metallic cobalt can be produced by electrolytic refining of valuable metal-containing products such as nickel sulfate, cobalt sulfate, and cobalt chloride.
  • Methods for recovering valuable metal-containing products, valuable metal-containing intermediates, or both include, for example, atmospheric acid leaching, high pressure acid leaching (HPAL), chlorine dissolution, ammonia dissolution, and electric furnace dissolution.
  • Normal pressure acid leaching and high pressure acid leaching include, for example, adding an acid such as concentrated sulfuric acid to a valuable metal-containing residue under atmospheric or high pressure, preferably at high temperature, to ionize the valuable metal and leach it into a liquid phase.
  • the chlorine dissolution method includes, for example, adding hydrochloric acid to a valuable metal-containing residue to form an aqueous solution containing a valuable metal chloride, and recovering the valuable metal in the form of a valuable metal chloride, or reducing the valuable metal chloride by electrolysis or the like to recover the valuable metal.
  • the ammonia dissolution method includes, for example, adding ammonia to a valuable metal-containing residue to extract the valuable metal in the form of a metal complex salt (e.g., a nickel complex salt), and is also known as the Calon process.
  • the electric furnace melting method involves, for example, using an electric furnace to melt valuable metal-containing residues, and then oxidizing and removing C, Si, Mn, Cr, P, etc. in a mixed gas flow of argon and oxygen to recover the valuable metals or their alloys.
  • the HPAL process recovers valuable metal-containing products, valuable metal-containing intermediates, or both from valuable metal-containing residues.
  • the HPAL process can efficiently recover valuable metals such as Ni and Co even when nickel oxide ore with a low Ni content is used as the starting material.
  • FIG. 6 shows an outline of the HPAL process in a flow diagram.
  • an acid such as concentrated sulfuric acid is added to a valuable metal-containing residue in the form of a slurry in a reactor such as an autoclave under high temperature and pressure to obtain a leaching slurry.
  • the valuable metals contained in the valuable metal-containing residue are ionized by reaction with concentrated sulfuric acid and leached into the liquid phase of the leaching slurry.
  • a neutralizing agent is added to the leaching slurry in the primary neutralization to adjust the pH to about 1.5. This pH adjustment is intended to precipitate metal ions such as Fe and Al contained in the leaching slurry as oxides in the primary neutralization.
  • the leaching slurry is washed in multiple stages by continuous countercurrent decantation (CCD) and separated into a solid-liquid separation into a leachate and a leach residue.
  • Fe is extracted in the leach residue in the form of hematite (Fe 2 O 3 ). Since the leachate from which Fe, Al, etc. have been separated by the CCD contains traces of Cu, Zn, etc., these elements are separated by adjusting the pH and redox potential of the leachate, and then the pH of the leachate is adjusted to about 5 to selectively precipitate Ni and Co.
  • a mixed sulfide precipitate (MSP) of nickel sulfide and cobalt sulfide is obtained as a valuable metal-containing intermediate.
  • MSP mixed sulfide precipitate
  • MHP mixed hydroxide precipitate
  • These valuable metal-containing intermediates are separated by a solid-liquid separator to obtain a valuable metal-containing product.
  • Mn, Mg, etc. are dissolved. Therefore, a final neutralization is performed to remove these alkaline earth metals until the marine discharge standard value is reached.
  • a neutralizing agent is added to the solution in the final neutralization to adjust the pH of the solution to about 8.5 to about 9.
  • concentrated sulfuric acid produced by the treatment of the exhaust gas from the roasting process included in the pretreatment can be used as part or all of the acid for the HPAL treatment.
  • alkaline earth metal carbonates generated by CO2 fixation can be used as a neutralizing agent for adjusting the pH of the primary neutralization, final neutralization, or both.
  • the HPAL process is used for valuable metal recovery.
  • CO2 fixation and non-ferrous metal smelting processes can be highly integrated.
  • the valuable metal-containing residue obtained by pretreatment can be used as a raw material for the HPAL process, and the alkaline earth metal carbonates generated by CO2 fixation can be used as neutralizing agents for primary neutralization, final neutralization, tailings dam pH adjustment, etc., which are subsequent steps in the HPAL process.
  • concentrated sulfuric acid produced in a sulfuric acid plant can be used as an acid for the HPAL process.
  • the method and apparatus of the present disclosure can be suitably used for CO2 fixation and valuable metal recovery.
  • the layouts of the extraction step of the CO2 fixation apparatus of one embodiment (Example) and the CO2 fixation apparatus using a multi-stage wet mill (Comparative Example) were compared.
  • the extraction step using a wet mill the grinding of alkaline earth metal-containing particles and the extraction of alkaline earth metal are simultaneously performed in the wet mill.
  • FIG. 7A An exemplary device layout for the extraction process of the CO2 fixation device of one embodiment is shown in a top view in Figure 7A.
  • the inner diameter of the stirring tank 10 was set to 12 m and the height to 18 m based on the processing amount of 59 t/h.
  • One wet mill was installed as the crushing device 20, and a liquid cyclone was installed as the classification device 30.
  • the pump 102, the maintenance space 103, and the pipe rack 104 are also shown in Figure 7A.
  • the appropriate dimensions of the wet mill are assumed to be about 3 m in inner diameter and 5 m in length, based on the processing rate of 59 t/h. Since the slurry residence time per wet mill is assumed to be about 15 minutes, eight wet mills connected in series are required to achieve a total slurry residence time of 2 hours.
  • the layout of the CO 2 fixation device using a multi-stage wet mill for the extraction process is as shown in FIG. 7B.
  • FIG. 7B the layout of the CO 2 fixation device using a multi-stage wet mill for the extraction process is as shown in FIG. 7B.
  • the CO2 fixation device of the present disclosure can significantly reduce the installation area of the equipment related to the extraction process.
  • the methods and apparatus of the present disclosure can be advantageously used for CO2 fixation and valuable metal recovery.

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Abstract

L'invention concerne un procédé d'immobilisation de CO2 et un dispositif d'immobilisation de CO2 qui permettent d'extraire efficacement un métal alcalino-terreux d'un solide contenant un métal alcalino-terreux dans une phase liquide tout en réduisant une zone d'installation pour un équipement associé au processus d'extraction, ce qui permet de réduire les coûts liés aux matières premières, à l'équipement, aux opérations, etc. Un procédé d'immobilisation de CO2 selon un mode de réalisation de la présente invention comprend : l'agitation et le mélange d'une source de CO2 et d'une suspension contenant des particules contenant un métal alcalino-terreux et un milieu aqueux dans un réservoir d'agitation pour extraire des ions d'un métal alcalino-terreux dans les particules contenant un métal alcalino-terreux en une phase liquide ; l'extraction d'une suspension contenant les particules contenant un métal alcalino-terreux à partir du réservoir d'agitation et fournir la suspension à un dispositif de pulvérisation ; la pulvérisation des particules contenant un métal alcalino-terreux dans le dispositif de pulvérisation ; et l'approvisionnement d'une suspension contenant les particules contenant un métal alcalino-terreux pulvérisé au réservoir d'agitation.
PCT/JP2023/020091 2023-05-30 2023-05-30 Procédé d'immobilisation de co2 et dispositif d'immobilisation de co2 Pending WO2024247105A1 (fr)

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PCT/JP2023/020091 WO2024247105A1 (fr) 2023-05-30 2023-05-30 Procédé d'immobilisation de co2 et dispositif d'immobilisation de co2
PCT/JP2024/017287 WO2024247647A1 (fr) 2023-05-30 2024-05-09 Procédé de fixation de co2, dispositif de fixation de co2 et procédé de récupération de métal de valeur
AU2024279042A AU2024279042A1 (en) 2023-05-30 2024-05-09 Co2 fixation method, co2 fixation device, and method for recovering valuable metal

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