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WO2024256668A1 - Élimination de métaux lourds d'un flux contenant de l'acide phosphorique - Google Patents

Élimination de métaux lourds d'un flux contenant de l'acide phosphorique Download PDF

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Publication number
WO2024256668A1
WO2024256668A1 PCT/EP2024/066628 EP2024066628W WO2024256668A1 WO 2024256668 A1 WO2024256668 A1 WO 2024256668A1 EP 2024066628 W EP2024066628 W EP 2024066628W WO 2024256668 A1 WO2024256668 A1 WO 2024256668A1
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Prior art keywords
phosphoric acid
acid containing
containing stream
heavy metal
metal ions
Prior art date
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Pending
Application number
PCT/EP2024/066628
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English (en)
Inventor
Ravi Rajshekar HIREMATH
Franklyn BALLENTINE
Lei Zhang
Michael Moser
Joseph Calbick
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Cytec Industrial Materials Derby Ltd
Cytec Industries Inc
Original Assignee
Cytec Industrial Materials Derby Ltd
Cytec Industries Inc
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Filing date
Publication date
Application filed by Cytec Industrial Materials Derby Ltd, Cytec Industries Inc filed Critical Cytec Industrial Materials Derby Ltd
Priority to AU2024303923A priority Critical patent/AU2024303923A1/en
Publication of WO2024256668A1 publication Critical patent/WO2024256668A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/18—Phosphoric acid
    • C01B25/234—Purification; Stabilisation; Concentration
    • C01B25/237—Selective elimination of impurities
    • C01B25/238—Cationic impurities, e.g. arsenic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/683—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of complex-forming compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Definitions

  • the technological concept disclosed herein generally relates to purification of industrial process streams. More particularly, the concept disclosed herein relates to removing heavy metal ions from phosphoric acid containing streams.
  • phosphoric acid is produced according to the wet process, which is conventionally prepared by acidulating phosphate rock (which contains calcium phosphate) with sulfuric acid to yield a crude wet-process phosphoric acid (WPA) and insoluble calcium sulfate (gypsum).
  • WPA wet-process phosphoric acid
  • gypsum insoluble calcium sulfate
  • the purified phosphoric acid is either sent out as Merchant Grade Acid (MGA) or continued to make 69 % P2O5 Super Phosphoric Acid (SPA), where it can be converted to many end products ranging from a chemical reagent, rust inhibitor, food additive, dental and orthopaedic etchant, electrolyte, flux, dispersing agent, industrial etchant, fertilizer feedstock, and component of home cleaning products.
  • MAA Merchant Grade Acid
  • SPA Super Phosphoric Acid
  • crude phosphoric acid is concentrated to 54 % (P2O5) before being sent for monoammonium phosphate (MAP), diammonium phosphate (DAP), or ammonium phosphate-sulfate (APS) production.
  • MAP monoammonium phosphate
  • DAP diammonium phosphate
  • APS ammonium phosphate-sulfate
  • phosphoric acid During the production of phosphoric acid, certain metal impurities in the form of heavy metal ions, such as cadmium (Cd), arsenic (As), lead (Pb), copper (Cu), and mercury (Hg), are present as minerals in the phosphate rock and are dissolved into the phosphoric acid. Depending on the application of the phosphoric acid, the metal impurities above a certain level are considered unacceptable because of their toxicity.
  • Cd cadmium
  • Au arsenic
  • Pb lead
  • Cu copper
  • Hg mercury
  • Cd cadmium
  • Phosphate fertilizers have been identified as an important source that introduces Cd to the soil, which can be easily absorbed by agricultural plants and accumulated into the food chain (“Cadmium in phosphate fertilizers; ecological and economical aspects”, CHEMIK 2014, 68, 10, 837-842).
  • Cd in phosphate fertilizer comes from phosphoric acid, the major raw material used to produce phosphate fertilizer. In fact, the majority of phosphoric acid production is used to produce fertilizer. Cd in phosphoric acid further stems from the phosphate bearing ores. Therefore, Cd can be removed either from the phosphate ore or from the phosphoric acid stream, with the latter being the focus of research in the past decades.
  • U.S. Patent No. 4,378,340 (1983) describes a method of removing heavy metals, particularly cadmium, from wet process phosphoric acid through partial neutralization of acids with alkali, followed by precipitation with sulfide compounds.
  • U.S. Patent No. 5,431,895 (1995) also discloses using alkali solution and aqueous sulfide solution simultaneously with thorough mixing to remove lead and cadmium from phosphoric acid.
  • 4,986,970 (1991) discloses using metal salt of dithio carbonic acid- O-esters to precipitate the heavy metals, especially cadmium, from partially neutralized (pH 1.4-2) and pre-cooled (5-40 °C) phosphoric acid. Afterwards, the precipitates can be separated from the acid using methods like flotation or filtration.
  • U.S. Patent No. 4,452,768 (1984), U.S. Patent No. 4,479,924 (1984), U.S. Patent No. 4,713,229 (1987), and European Patent No. EP0333489 Bl (1989) describes methods of separating heavy metals, especially cadmium, mercury, and lead, from phosphoric acid using a diorganyldithiophosphoric acid ester and an adsorbent, a diorganyldithiophosphorus compound and an adsorbent, a diorganyldithiophosphoric acid ester and an adsorbent and a reductant, and a thioorganophosphine reagent and a reducing agent, respectively.
  • Patent Publication No. 2004/0179984 also discloses methods of removing heavy metals from wet process phosphoric acid by adding a mixture reagents of diorgano dithiophosphinic acid (or alkali metal or ammonia salts thereof), a first dithiophosphoric acid (or alkali metal or ammonia salts thereof) with alkyl or alkylaryl or aralkyl moieties, and optionally a second diaryl dithiophosphoric acid (or alkali metal or ammonia salts thereof).
  • the metal impurities have to be either completely removed or their levels in the phosphoric acid have to be significantly reduced.
  • another consideration in the removal of heavy metals is the off-gassing of FES to which operators near the acid stream are exposed in the processing of these streams.
  • embodiments disclosed herein relate to a process for removing heavy metal ions from a phosphoric acid containing stream, the process including: adding a diluted solution of a dialkyldithiophosphate compound having an alkyl chain length ranging from 8 to 12 carbon atoms to the phosphoric acid containing stream to form heavy metal ion complexes; and separating the heavy metal ion complexes from the phosphoric acid containing stream.
  • embodiments disclosed herein relate to a process of removing heavy metal ions from a phosphoric acid containing stream, the process including: adding an ammonium salt of dialkyldithiophosphoric acid having an alkyl chain length of 8 to 12 carbon atoms to the phosphoric acid containing stream to form heavy metal ion complexes; and separating the heavy metal ion complexes from the phosphoric acid containing stream.
  • embodiments disclosed herein relate to use of a diluted solution of a dialkyldithiophosphate compound having an alkyl chain length ranging from 8 to 12 carbon atoms for removing heavy metal ions from a phosphoric acid containing stream.
  • embodiments disclosed herein relate to purification of solutions in industrial process streams. More particularly, embodiments disclosed herein relate to processes for removing and/or recovering heavy metal ions from phosphoric acid containing streams by adding a diluted solution of a dialkyldithiophosphate compound having an alkyl chain length of C8 to C12.
  • the diluted solution of dialkyldithiophosphate may be added to the crude phosphoric acid, digestion slurries prior to gypsum filtration, the filtered phosphoric acid, or the concentrated phosphoric acid to precipitate heavy metal ions.
  • the precipitated heavy metal ions may be separated by filtration, centrifugation, sedimentation, decantation, creaming, flocculation, coagulation, adsorption, flotation, and combinations thereof.
  • alkyl is intended to include linear, branched, or cyclic hydrocarbon structures and combinations thereof.
  • a dialkyldithiophosphate compound having an alkyl chain length of C8 to Cl 2 includes a dialkyldithiophosphoric acid having an alkyl chain length of C8 to C12 and salts of the dialkyldithiophosphoric acid.
  • Salts of the dialkyldithiophosphoric acid may include calcium, magnesium, potassium, sodium, ammonium salt with the formula NR.1R.2R.3R4 , where Ri, R2, R3, R4 are, equal to or different from each other, independently chosen from hydrogen, alkyl or aryl groups, and combinations thereof.
  • the alkyl chain of the dialkyldithiophosphate compound is a C8 alkyl chain.
  • the salt of the dialkyldithiophosphoric acid is an ammonium salt.
  • the dialkyldithiophosphate compound is selected from the group consisting of di(2-ethylhexyl) dithiophosphate, di(3,7- dimethyloctyl) dithiophosphate, di(2-butyloctanol) dithiophosphate, and mixtures thereof.
  • the dialkyldithiophosphate compound is di(2-ethylhexyl) dithiophosphate, di(3,7-dimethyloctyl) di thiophosphate, di(2-butyloctanol) dithiophosphate, and mixtures thereof.
  • the dialkyldithiophosphate compound is di(2-ethylhexyl) dithiophosphate.
  • the dialkyldithiophosphate compound is in a diluted solution when it is added to a phosphoric acid containing stream.
  • the diluted solution may include a percent active (of dialkyldithiophosphate compound) having a lower limit of any of greater than 0, 1, 2, 5, or 10% to an upper limit of any of 10, 12, 15, or 20%.
  • the diluted solution may include water.
  • the dialkyldithiophosphate prior to adding a dialkyldithiophosphate compound to a phosphoric acid containing stream for forming heavy metal ion complexes, may be diluted.
  • Diluting may include 1% to 20% by weight (wt%) of the dialkyldithiophosphate compound added to water to provide a diluted solution.
  • the diluted solution may include a percent active having a lower limit of any of greater than 0, 1, 2, 5, or 10% to an upper limit of any of 10, 12, 15, or 20%.
  • diluting includes 10% of the dialkyl dithiophosphate compound in the diluted solution. It is also envisioned that the dialkyldithiophosphate compound is diluted inline with its addition to a phosphoric acid containing stream.
  • the diluted solution of dialkyldithiophosphate compound may be added to a phosphoric acid containing stream.
  • the phosphoric acid containing stream may include phosphoric acid solutions or solutions containing phosphoric acid.
  • Embodiments of the current disclosure include any acidic solution containing crude phosphoric acid, digestion slurries of phosphoric acid, filtered phosphoric acid, and/or concentrated phosphoric acid.
  • Phosphoric acid containing streams may be obtained from industrial phosphoric acid production plant streams.
  • heavy metal or “metal” shall refer to those elements of the periodic table having a density of more than 5 g/cm 3 and an oxidation state higher than 0, (i.e., heavy metal ions).
  • heavy metal ions include, for example, one or more of cadmium, chromium, arsenic, nickel, mercury, zinc, manganese, titanium, copper and lead.
  • cadmium ions are removed from phosphoric acid containing streams.
  • arsenic ions are removed from phosphoric acid containing streams.
  • Heavy metal complex refers to compounds formed by reacting heavy metal ions with chelating agents. Heavy metal complexes may be solid, waxy, or oily in the phosphoric acid solutions. The heavy metal ion complexes may precipitate, float, or suspend in the phosphoric acid solutions.
  • a process, according to one or more embodiments, for removing heavy metal ions from a phosphoric acid containing stream includes adding a diluted solution of a dialkyldithiophosphate compound having an alkyl chain length ranging from 8 to 12 carbons to the phosphoric acid containing stream to form heavy metal ion complexes.
  • the process then includes separating the heavy metal ion complexes from the phosphoric acid containing stream. Separating the heavy metal ion complexes may include filtration, precipitation, centrifugation, sedimentation, decantation, creaming, flocculation, coagulation, adsorption, flotation, and combinations thereof.
  • treatment of a phosphoric acid containing stream with the diluted solution of dialkyldithiophosphate compound, followed by a separation removing one or more heavy metals ion complexes may result in an acid stream having a heavy metal percent reduction of at least 25 percent.
  • the heavy metal reduction of one or more of the heavy metal ions referenced above may be at least 25, 50, 75, 90, 95, 98, 99, 99.5, 99.8 or 99.9 percent.
  • Such heavy metal content reduction may result in a heavy metal content of one or more of cadmium, chromium, arsenic, nickel, mercury, zinc, manganese, titanium, copper or lead in the acid stream of less than 25 ppm, 10 ppm, 5 ppm, 1 ppm, 0.5 ppm, or 0.1 ppm, in one or more embodiments.
  • the dosage of the dialkyldithiophosphate compound for forming heavy metal ion complexes will depend on the amount of heavy metal impurities present in the ore and/or phosphoric acid containing streams. The greater number of heavy metals present and the higher their concentrations, the greater will be the overall dosage of the dialkyldithiophosphate compound. Those skilled in the art will be able to readily determine and establish the optimum dosage of the dialkyldithiophosphate compound having the alkyl chain length of C8 to C12.
  • the dosage is in the range of from 0.01 to 50 kilogram (kg) of dialkyldithiophosphate compound per ton of P2O5 of the phosphoric acid solution, based on the type of heavy metal ions to be removed. In other embodiments, the dosage is from 0.1 kg to 10 kg dialkyldithiophosphate compound per ton of P2O5. For example, the dosage may have a lower limit of any of 0.01, 0.1, 1, 1.5, 2, or 5 kg of dialkyldithiophosphate compound per ton of P2O5 and an upper limit of any of 5, 8, 10, 20, 25, 30, or 50 kg of dialkyldithiophosphate compound per ton of P2O5.
  • any of the recited dosages can also be recited as “less than” a particular dosage, e.g., less than 50 kg; or that any of the recited dosages (except the highest dosage point) can also be recited as “greater than” a particular dosage, e.g., greater than 0.10 kg.
  • the phosphoric acid containing stream includes phosphoric acid of a P2O5 concentration from 4 percent by weight (wt. %) to 70 wt. %. In other embodiments, the phosphoric acid containing stream includes from 20 wt. % to 70 wt. %. Specific concentrations of P2O5 may include 20 wt%, 25 wt. %, 28 wt. %, 30 wt. %, 42 wt. %, 44 wt. %, 52 wt. %, 54wt. %, 57 wt. %, 60 wt. %, 69 wt% and combinations thereof.
  • the process of adding a diluted solution of a dialkyldithiophosphate compound to a phosphoric acid containing stream for forming heavy metal ion complexes includes adding the diluted solution of dialkyldithiophosphate compound to the crude phosphoric acid.
  • the dialkyldithiophosphate compound may alternatively be added to the digestion slurries prior to gypsum filtration, to the filtered phosphoric acid, or to the concentrated phosphoric acid to complex the heavy metal ions.
  • the process for forming heavy metal ion complexes in a phosphoric acid containing stream by adding a diluted solution of a dialkyldithiophoshate compound may be performed over a wide temperature range. According to one or more embodiments, the process is performed at a temperature from 0 °C to 120 °C. In other embodiments, the temperature is from 20 °C to 80 °C. [0033] According to one or more embodiments, adding a diluted solution of dialkyldithiophosphate compound to a phosphoric acid containing stream to form heavy metal ion complexes includes a treatment time. Treatment times may be from a few seconds (z.e., 5 to 10 seconds) to 240 minutes. In those instances where the dialkyldithiophosphate complexes the heavy metal ions very rapidly, the treatment times may be from about 5 seconds to 15 minutes.
  • a process for removing heavy metal ions from a phosphoric acid containing stream by adding a diluted solution of a dialkyldithiophosphate compound further includes adding a reducing agent and/or an adsorbing agent.
  • the reducing agent and/or the adsorbing agent may enhance the activity of the diluted solution of the dialkyldithiophosphate compound.
  • the reducing and/or adsorbing agent is added to the phosphoric acid containing streams all in one stage. In other embodiments, the reducing and/or adsorbing agent is added in several stages.
  • the reducing and/or adsorbing agent is added together as a blend with the dialkyldithiophosphate compound.
  • the reducing agent and/or adsorbing agent may be added separately or sequentially, in any order, with the dialkyldithiophosphate compound.
  • Adding a diluted solution of a dialkyldithiophosphate compound to a phosphoric acid containing stream for forming heavy metal ion complexes may include further adding a reducing agent.
  • the reducing agent may include iron powder, zinc, red phosphorus, iron (II) sulfate, sodium hypophosphite, hydrazine, hydroxymethane sulfonate, and mixtures thereof.
  • the reducing agent includes iron powder and sodium hypophosphite.
  • the reducing agent may be added in an amount from 0.01 kg to 50 kg of reducing agent per ton of P2O5.
  • the amount of reagent agent may be based on the type and quantity of the oxidants in the phosphoric acid containing stream.
  • the amount of reducing agent is from 0.1 kg to 25 kg of reducing agent per ton of P2O5 of the phosphoric acid containing stream.
  • adding a diluted solution of a dialkyldithiophosphate compound to a phosphoric acid containing stream for forming heavy metal ion complexes includes further adding an adsorbing agent.
  • Adsorbing agents may include activated charcoal/carbon, carbon black, ground lignite, adsorbents containing silicate (e.g., synthetic silicic acids, zeolites, calcium silicate, bentonite, perlite, diatomaceous earth, and fluorosilicate), calcium sulfate (including gypsum, hemihydrate, and anhydride), and mixtures thereof.
  • silicate e.g., synthetic silicic acids, zeolites, calcium silicate, bentonite, perlite, diatomaceous earth, and fluorosilicate
  • calcium sulfate including gypsum, hemihydrate, and anhydride
  • the adsorbing agent is added in an amount from 0.05 wt. % to 50 wt. %. In other embodiments, the adsorbing agent is added in an amount from 0.1 wt. % to 30 wt. %, based on the quantity of phosphoric acid in the solution.
  • a process for removing heavy metal ions from a phosphoric acid containing stream includes separating heavy metal ion complexes from the phosphoric acid containing stream. Separating the heavy metal ion complexes may include filtration, centrifugation, precipitation, sedimentation, decantation, creaming, coagulation, flocculation, adsorption, flotation, and combinations thereof.
  • Embodiments of the present disclosure may provide at least one of the following advantages.
  • the process of removing heavy metal ions from a phosphoric acid stream using a diluted solution of dialkyldithiophosphate having an alkyl chain of C8 to C12 has a significant improvement in removal of the heavy metal ions from the acid, as compared to other processes known in the art.
  • the process of removing heavy metal ions from a phosphoric acid containing stream using a diluted solution of dialkyldithiophosphate having an alkyl chain of C8 to C12 has a significant improvement in handling when the salt of the dialkyldithiophosphoric acid is ammonium.
  • the ammonium salt is less viscous than dialkyldithiophosphoric acids with salts of potassium or sodium. The reduction in viscosity results in the ammonium salt of the dialkyldithiophosphoric acid compound being easier to handle and to pump into the phosphoric acid containing streams.
  • the performances of the diluted C8 dialkyldithiophosphate to remove heavy metals are evaluated with phosphoric acid and phosphoric acid slurries.
  • the phosphoric acids with different P2O5 levels are obtained from plants.
  • To separate the heavy metal precipitates from the acid either a syringe filter or a vacuum filtration is used. Afterwards, the filtrate acids are analyzed with ICP (Inductively Coupled Plasma) to determine the level of various heavy metal elements.
  • ICP Inductively Coupled Plasma
  • C10DTP di(3,7-dimethyloctyl) dithiophosphoric acid
  • Example 1 Process for removing heavy metals from plant phosphoric acids from plant#l ( ⁇ 57% P2O5) at elevated temperature (72°C)
  • PVDF polyvinylidene difluoride
  • Example 2 Process for removing heavy metals from plant phosphoric acids from plant #2 ( ⁇ 28 % P2O5) at elevated temperature (72°C).
  • Example 3 Process for removing heavy metals from plant phosphoric acids from plant #1 ( ⁇ 57 % P2O5) at elevated temperature (72°C)
  • Example 4 Process for removing heavy metals from plant phosphoric acids from plant #1 ( ⁇ 57 % P2O5) at elevated temperature (72°C)
  • PVDF polyvinylidene difluoride
  • Example 5 Process for removing heavy metals from plant phosphoric acids from plant #1 ( ⁇ 57 % P2O5) at elevated temperature (72°C)
  • Example 6 Process for measuring H2S off-gassing from the degradation of the heavy metals removal agents from phosphoric acid from plant # 1 ( ⁇ 57 % P2O5) at ⁇
  • Example 7 Use of NH4 counterion to make a neutralized C8DTP reagent that is easy to apply and handle
  • the primary aspect is the handling of the reagent. Pumps are generally used to apply the measured quantities of reagent into the phosphoric acid streams. Reagents with higher viscosities are considered difficult to handle and pump and vice versa.
  • the NH4 salt of C8DTP in its undiluted form is a liquid at temperatures of 20 °C with viscosity of 165 centipoise.
  • the K salt of the C8DTP in its undiluted form is a thick viscous liquid and the viscosity of this reagent at 20 °C is 5187 centipoise.
  • the Na salt of C8DTP is a waxy solid at room temperature with a measured viscosity of 3.66 x 10 6 centipoise at 20 °C. Based on the data discussed above, it is evident that neutralizing the C8DTP with NH4 results in a unique reagent that is easy to handle and pump.

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Abstract

L'invention concerne un procédé d'élimination d'ions de métaux lourds d'un flux contenant de l'acide phosphorique, pouvant comprendre l'ajout d'une solution diluée d'un composé de dialkyldithiophosphate ayant une longueur de chaîne alkyle allant de 8 à 12 atomes de carbone au flux contenant de l'acide phosphorique pour former des complexes d'ions de métaux lourds ; et la séparation des complexes d'ions de métaux lourds du flux contenant de l'acide phosphorique.
PCT/EP2024/066628 2023-06-15 2024-06-14 Élimination de métaux lourds d'un flux contenant de l'acide phosphorique Pending WO2024256668A1 (fr)

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AU2024303923A AU2024303923A1 (en) 2023-06-15 2024-06-14 Heavy metals removal from phosphoric acid containing streams

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US63/508,429 2023-06-15

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378340A (en) 1979-05-10 1983-03-29 Boliden Aktiebolag Method of purifying phosphoric acid of heavy metals
US4452768A (en) 1982-01-28 1984-06-05 Hoechst Aktiengesellschaft Process for removing heavy metal ions from wet-processed phosphoric acid
US4479924A (en) 1982-04-05 1984-10-30 Hoechst Aktiengesellschaft Process for the separation of heavy metal compounds from phosphoric acid
US4713229A (en) 1984-09-21 1987-12-15 Hoechst Aktiengesellschaft Process for purifying phosphoric acid
US4986970A (en) 1988-03-04 1991-01-22 Norsk Hydro A.S. Method for removal of heavy metals, especially cadmium, from phosphoric acid containing solutions
EP0333489B1 (fr) 1988-03-16 1994-06-22 IMI (TAMI) INSTITUTE FOR RESEARCH & DEVELOPMENT LTD. Procédé d'élimination d'ions de métaux lourds d'acide phosphorique
US5431895A (en) 1993-08-14 1995-07-11 Hoechst Aktiengesellschaft Process for the removal of lead and cadmium from phosphoric acid
US20040179984A1 (en) 2003-03-13 2004-09-16 Nagaraj D. R. Process for removing metal impurities from wet process phosphoric acid and compositions thereof
US20180119251A1 (en) * 2016-11-01 2018-05-03 Battelle Energy Alliance, Llc Methods of recovering rare earth elements from a material
US20190106324A1 (en) * 2017-10-08 2019-04-11 Cytec Industries Inc. Compositions and processes for removing heavy metals from phosphoric acid solutions
US20220332582A1 (en) * 2019-08-21 2022-10-20 Jesa Technologies Llc Method for removing cadmium in the manufacture of phosphoric acid

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378340A (en) 1979-05-10 1983-03-29 Boliden Aktiebolag Method of purifying phosphoric acid of heavy metals
US4452768A (en) 1982-01-28 1984-06-05 Hoechst Aktiengesellschaft Process for removing heavy metal ions from wet-processed phosphoric acid
US4479924A (en) 1982-04-05 1984-10-30 Hoechst Aktiengesellschaft Process for the separation of heavy metal compounds from phosphoric acid
US4713229A (en) 1984-09-21 1987-12-15 Hoechst Aktiengesellschaft Process for purifying phosphoric acid
US4986970A (en) 1988-03-04 1991-01-22 Norsk Hydro A.S. Method for removal of heavy metals, especially cadmium, from phosphoric acid containing solutions
EP0333489B1 (fr) 1988-03-16 1994-06-22 IMI (TAMI) INSTITUTE FOR RESEARCH & DEVELOPMENT LTD. Procédé d'élimination d'ions de métaux lourds d'acide phosphorique
US5431895A (en) 1993-08-14 1995-07-11 Hoechst Aktiengesellschaft Process for the removal of lead and cadmium from phosphoric acid
US20040179984A1 (en) 2003-03-13 2004-09-16 Nagaraj D. R. Process for removing metal impurities from wet process phosphoric acid and compositions thereof
US20180119251A1 (en) * 2016-11-01 2018-05-03 Battelle Energy Alliance, Llc Methods of recovering rare earth elements from a material
US20190106324A1 (en) * 2017-10-08 2019-04-11 Cytec Industries Inc. Compositions and processes for removing heavy metals from phosphoric acid solutions
US20220332582A1 (en) * 2019-08-21 2022-10-20 Jesa Technologies Llc Method for removing cadmium in the manufacture of phosphoric acid

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
"Cadmium in phosphate fertilizers; ecological and economical aspects", CHEMIK, vol. 68, no. 10, 2014, pages 837 - 842
"Cadmium(II) extraction from phosphoric media by bis(2,4,4-trimethylpentyl) thiophosphinic acid", FLUID PHASE EQUILIBRIA, vol. 145, 1998, pages 301 - 310
"Conference ''Fertilizers in Focus", 2001, FERTILIZER INDUSTRY FEDERATION OF AUSTRALIA, INC., article "Progress in the development of decadmiation of phosphorus fertilizers", pages: 101 - 106
"Extraction of cadmium from phosphoric acid by trioctylphosphine oxide/kerosene solvent using factorial design", PERIODICA POLYTECHNIC CHEMICAL ENGINEERING, vol. 55/2, 2011, pages 45 - 48
EU MEMO-16-826, 17 March 2016 (2016-03-17)

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