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US20190185964A1 - Method for purifying scandium and scandium extractant - Google Patents

Method for purifying scandium and scandium extractant Download PDF

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Publication number
US20190185964A1
US20190185964A1 US16/327,359 US201716327359A US2019185964A1 US 20190185964 A1 US20190185964 A1 US 20190185964A1 US 201716327359 A US201716327359 A US 201716327359A US 2019185964 A1 US2019185964 A1 US 2019185964A1
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Prior art keywords
scandium
extractant
acidic solution
solution
acid
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Inventor
Masahiro Goto
Fukiko Kubota
Itsumi Matsuoka
Satoshi Asano
Hiroshi Kobayashi
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Sumitomo Metal Mining Co Ltd
Kyushu University NUC
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Sumitomo Metal Mining Co Ltd
Kyushu University NUC
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Assigned to KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION, SUMITOMO METAL MINING CO., LTD. reassignment KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASANO, SATOSHI, GOTO, MASAHIRO, KOBAYASHI, HIROSHI, KUBOTA, Fukiko, MATSUOKA, Itsumi
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B59/00—Obtaining rare earth metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D11/00—Solvent extraction
    • B01D11/04—Solvent extraction of solutions which are liquid
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
    • C22B3/38—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
    • C22B3/381—Phosphines, e.g. compounds with the formula PRnH3-n, with n = 0-3
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
    • C22B3/38—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
    • C22B3/384—Pentavalent phosphorus oxyacids, esters thereof
    • C22B3/3844—Phosphonic acid, e.g. H2P(O)(OH)2
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
    • C22B3/40—Mixtures
    • C22B3/408—Mixtures using a mixture of phosphorus-based acid derivatives of different types
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for recovering scandium.
  • the present invention relates to a method for purifying scandium by separating impurities including iron from an acidic solution which is generated in a hydrometallurgy process of nickel oxide ore and contains scandium and the like.
  • Rare earth elements are expensive, the production quantity thereof is also limited, further rare earth elements are an element which is hardly separated and purified, and thus the range of use thereof is limited.
  • scandium As an example of rare earth elements, there is scandium.
  • a trace amount of scandium is contained in nickel oxide ore such as laterite ore, and scandium contained in the nickel oxide ore can be recovered from the leachate to be obtained by adding sulfuric acid to the nickel oxide ore and subjecting the nickel oxide ore to pressure leaching.
  • Patent Document 1 discloses that nickel and scandium can be recovered from an oxide ore by performing (A) a leaching step of leaching an oxide ore with an acid under high temperature and high pressure to obtain a leachate containing nickel and scandium, (B) a first neutralization step of removing iron and aluminum in the leachate as a precipitate by adjusting the pH of the leachate to the range of 2 to 4 by addition of a neutralizing agent to the leachate, (C) a second neutralization step of recovering scandium in the solution obtained by removing the precipitate in the first neutralization step as a precipitate by adjusting the pH of the solution to the range of more than 4 to 7.5 by addition of a neutralizing agent to the solution, and (D) a third neutralization step of recovering nickel in the solution as a precipitate by adjusting the pH of the solution to more than 7.5 by addition of a neutralizing agent to the solution.
  • A a leaching step of leaching an oxide ore with an acid under high temperature and high pressure to obtain a leachat
  • Patent Document 2 As a method for selectively separating only scandium by means of solvent extraction and the like, for example, there is a method described in Patent Document 2. This method is a method in which an organic solvent is first added to a scandium-containing solution of an aqueous phase containing at least one or more kinds of iron, aluminum, calcium, yttrium, manganese, chromium, or magnesium in addition to scandium and the scandium component is extracted into the organic solvent.
  • scrubbing is performed by adding an aqueous solution of hydrochloric acid to the organic solvent in order to separate minor components which have been extracted into the organic solvent together with scandium to remove the minor components, an aqueous solution of sodium hydroxide is then added to the organic solvent, and the scandium remaining in the organic solvent is formed into a slurry containing Sc(OH) 3 .
  • an aqueous solution of scandium chloride is obtained by dissolving Sc(OH)3 obtained by filtering this slurry in hydrochloric acid, a precipitate of scandium oxalate is formed by adding oxalic acid to this, the trace impurities are separated into the filtrate by filtering the precipitate, and then the residue is calcined to obtain high purity scandium oxide.
  • Patent Document 3 proposes a method for recovering nickel from an electroless nickel waste liquid using two or more kinds of extractants in mixture at a higher yield as compared with the case of using one kind of extractant singly by utilizing the cooperative effect. According to Patent Document 3, it is said that nickel can be recovered at 98% to 99% by one time of batch extraction without performing pH adjustment in the case of using two or more kinds of extractants in mixture although nickel cannot be almost extracted in the case of using one kind of extractant singly.
  • Patent Document 4 proposes a method for extracting cobalt and manganese from a mixed solution of cobalt, manganese, calcium, and magnesium by mixing a carboxylic acid-based extractant with an oxime-based extractant.
  • An object of the present invention is to provide a method for efficiently purifying scandium by separating scandium and impurities in an acidic solution containing impurities including iron as well as scandium from each other.
  • the present inventors have performed extensive studies to solve the aforementioned problems. As a result, the present inventors have found out that scandium can be selectively extracted by performing solvent extraction using a mixed extractant containing a phosphoric acid-based extractant and a neutral extractant. Then the present invention has been completed.
  • a first embodiment of the present invention provides a method for purifying scandium, including: subjecting an acidic solution containing an element component including at least iron as well as scandium to solvent extraction using a mixed extractant containing a phosphoric acid-based extractant and a neutral extractant to extract scandium from the acidic solution.
  • a second embodiment of the present invention provides the method for purifying scandium according to the first embodiment, in which the phosphoric acid-based extractant is 2-ethylhexylphosphonic acid 1-ethylhexyl.
  • a third embodiment of the present invention provides the method for purifying scandium according to the first or second embodiment, in which the neutral extractant is tri-n-octylphosphine oxide.
  • a fourth embodiment of the present invention provides the method for purifying scandium according to any one of the first to third embodiments, in which the phosphoric acid-based extractant is contained in the mixed extractant at a mixing proportion in a range of between 5% or more and 50% or less in terms of molar ratio.
  • a fifth embodiment of the present invention provides the method for purifying scandium according to any one of the first to fourth embodiments, in which a pH of the acidic solution is adjusted to a range of between 0.0 or more and 2.0 or less and the acidic solution after pH adjustment is subjected to the solvent extraction.
  • a sixth embodiment of the present invention provides the method for purifying scandium according to any one of the first to fourth embodiments, in which the acidic solution is a solution obtained by adding an acid to nickel oxide ore and leaching scandium or a solution obtained by dissolving scandium oxide or scandium hydroxide in an acid, a pH of the acidic solution is adjusted to a range of between 0.0 or more and 2.0 or less, and the acidic solution after pH adjustment is subjected to the solvent extraction.
  • a seventh embodiment of the present invention provides the method for purifying scandium according to any one of the first to sixth embodiments, in which the acidic solution further contains any one or more kinds of zirconium or thorium.
  • An eighth embodiment of the present invention provides a scandium extractant for extracting scandium from an acidic solution containing an element component including at least iron as well as scandium, containing: a phosphoric acid-based extractant and a neutral extractant.
  • a ninth embodiment of the present invention provides the scandium extractant according to the eighth embodiment, in which the phosphoric acid-based extractant is contained at a proportion in a range of between 5% or more and 50% or less in terms of molar ratio.
  • FIG. 1 is a diagram for illustrating the relation between the pH and the extraction rate when a mixed extractant (PC88A+TOPO) is used in Example 1.
  • FIG. 2 is a diagram for illustrating the relation between the pH and the extraction rate when an extractant composed only of a neutral extractant (TOPO) is used in Comparative Example 1.
  • TOPO neutral extractant
  • FIG. 3 is a diagram for illustrating the relation between the pH and the extraction rate when an extractant composed only of a phosphoric acid-based extractant (PC88A) is used in Comparative Example 2.
  • PC88A phosphoric acid-based extractant
  • FIG. 4 is a diagram for illustrating the relation between the pH and the separation factor when a scandium extractant according to a mixed extractant is used in Example 1.
  • FIG. 5 is a diagram for illustrating the relation between the pH and the separation factor when an extractant composed only of a neutral extractant (TOPO) is used in Comparative Example 1.
  • TOPO neutral extractant
  • FIG. 6 is a diagram for illustrating the relation between the pH and the extraction rates of various kinds of elements contained in nickel oxide ore when a mixed extractant (PC88A+TOPO) is used in Example 2.
  • FIG. 7 is a diagram for illustrating the relation between the pH and the extraction rates of various kinds of elements contained in nickel oxide ore when a mixed extractant (PC88A+TOPO) is used in Example 3.
  • FIG. 8 is a diagram for illustrating the relation between the pH and the extraction rate when a mixed extractant (PC88A+TOPO) is used in Reference Example 1.
  • FIG. 9 is a diagram for illustrating the relation between the pH and the separation factor when a mixed extractant (PC88A+TOPO) is used in Reference Example 1.
  • FIG. 10 is a diagram for illustrating the relation between the pH and the extraction rate when a mixed extractant (Cyanex272+TOPO) is used in Example 4.
  • FIG. 11 is a diagram for illustrating the relation between the pH and the separation factor when a mixed extractant (Cyanex272+TOPO) is used in Example 4.
  • the method for purifying scandium according to the present embodiment is a method in which scandium is extracted from an acidic solution containing scandium (Sc) through solvent extraction and purified (recovered). Particularly, in this method for purifying scandium, scandium in an acidic solution containing impurity elements including at least iron (Fe) as well as scandium is separated from these impurities and thus extracted.
  • scandium is extracted from an acidic solution containing an impurity element including at least iron as well as scandium by subjecting the acidic solution to solvent extraction using a mixed extractant containing a phosphoric acid-based extractant and a neutral extractant.
  • this method it is possible to efficiently separate impurities including at least iron, scandium, and impurity elements from one another and to selectively extract only scandium.
  • impurities including at least iron, scandium, and impurity elements from one another and to selectively extract only scandium.
  • An acidic solution containing scandium (hereinafter simply referred to as the “acidic solution”) is a solution to be a target for a solvent extraction treatment and is one that contains an impurity element including at least iron as well as scandium.
  • this acidic solution may include a solution into which a valuable metal including scandium is leached by adding an acid such as sulfuric acid to nickel oxide ore in a hydrometallurgy process of nickel oxide ore.
  • examples of the acidic solution may include a solution to be obtained by dissolving scandium oxide or scandium hydroxide in an acid such as sulfuric acid.
  • Examples of the acidic solution to be obtained through acid leaching of nickel oxide ore may include a leachate obtained through acid leaching of nickel oxide ore or a post-sulfuration liquid obtained by adding a sulfurizing agent to the leachate and separating and removing nickel, cobalt, and the like by a sulfuration reaction.
  • the post-sulfuration liquid is a solution obtained by adding an acid such as sulfuric acid to nickel oxide ore, subjecting the nickel oxide ore to a leaching treatment, subjecting the leachate obtained to a neutralization treatment using a neutralizing agent, then adding a sulfurizing agent such as hydrogen sulfide gas to the neutralized liquid to cause a sulfuration reaction, and separating and removing sulfides of nickel and cobalt.
  • the acidic solution to be obtained through such acid leaching of nickel oxide ore contains any one or more kinds of elements of zirconium (Zr) or thorium (Th) in addition to iron.
  • the mixed extractant is one that contains a phosphoric acid-based extractant and a neutral extractant.
  • the acidic solution described above is subjected to a solvent extraction treatment using such a mixed extractant.
  • the phosphoric acid-based extractant is not particularly limited, but examples thereof may include 2-ethylhexylphosphonic acid 1-ethylhexyl.
  • this phosphoric acid-based extractant is commercially available under a trade name of PC88A manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.
  • the neutral extractant is not particularly limited, but examples thereof may include tri-n-octylphosphine oxide.
  • this neutral extractant is commercially available under a trade name of TOPO manufactured by DOJINDO LABORATORIES.
  • the proportion of the phosphoric acid-based extractant in the mixed extractant is preferably in the range of between 5% or more and 50% or less in terms of molar ratio, and the proportion is more preferably in the range of between 15% or more and 30% or less in terms of molar ratio when ease of industrial handling is also taken into consideration.
  • the mixing proportion of the phosphoric acid-based extractant is in the range of between 5% or more and 50% or less in terms of molar ratio, it is possible to more efficiently perform the separation of scandium from an impurity element including iron and to enhance scandium selectivity in the solvent extraction.
  • the mixed extractant may contain an extractant other than the phosphoric acid-based extractant and neutral extractant described above in a range in which the effect by the mixed extractant is not impaired.
  • an extractant to be used in solvent extraction has a high viscosity and an adverse effect from the viewpoint of operation such as poor phase separation property with the aqueous phase is caused when the extractant is used in the extraction treatment as it is. For this reason, it is common to dilute the extractant with a diluent in order to decrease the viscosity of the extractant.
  • the diluent is not particularly limited as long as it can dissolve the mixed extractant to be used and a complex of scandium which is a rare earth element.
  • examples thereof may include chlorine-based solvents such as chloroform and dichloromethane, aromatic hydrocarbons such as benzene, toluene, and xylene, and aliphatic hydrocarbons such as hexane.
  • chlorine-based solvents such as chloroform and dichloromethane
  • aromatic hydrocarbons such as benzene, toluene, and xylene
  • aliphatic hydrocarbons such as hexane.
  • One kind of such a diluent may be used singly, or two or more kinds thereof may be used in mixture.
  • alcohols such as 1-octanol may be used in mixture.
  • an acidic solution containing an impurity element including iron and scandium is subjected to solvent extraction using a mixed extractant containing a phosphorus-based extractant and a neutral extractant and scandium is thus extracted as described above.
  • the acidic solution of a target for treatment and the mixed extractant are mixed together and stirred. Thereafter, scandium ions are selectively extracted into the organic phase by separating the mixed solution of the acidic solution and the mixed extractant into an aqueous phase and an organic phase by using a separatory funnel. At this time, it is possible to improve the scandium selectivity and to more efficiently extract scandium by use of the mixed extractant in which the mixing proportion of the phosphoric acid-based extractant is set to be in the range of between 5% or more and 50% or less as described above.
  • the stirring operation in the solvent extraction treatment may be performed at the sufficient number of revolutions to an extent to which the organic phase and the aqueous phase do not separate from each other when the mixed extractant and the acidic solution are mixed together.
  • the stirring time is not particularly limited, but it is preferable to set the stirring time to 20 minutes or more from the viewpoint of being able to extract scandium from the acidic solution at a higher yield.
  • the pH of the acidic solution to be mixed with the mixed extractant tends to decrease and it is thus preferable to suppress a decrease in pH by adding an aqueous alkali solution such as an aqueous solution of sodium hydroxide as appropriate.
  • the pH of the acidic solution when performing solvent extraction, it is preferable to adjust the pH of the acidic solution to be a target for treatment to a range of between 0.0 or more and 2.0 or less, it is more preferable to adjust the pH to a range of between 1.3 or more and 2.0 or less, and it is particularly preferable to adjust the pH to a range of between 1.7 or more and 2.0 or less prior to the extraction treatment.
  • an acidic solution containing iron ions in a large amount for example, a solution obtained through acid leaching of nickel oxide ore
  • a solution obtained through acid leaching of nickel oxide ore exceeds 2.5 to 3.0
  • hydroxides of iron is likely to be promoted, rare earth elements such as scandium are coprecipitated, and also inclusions called clad are generated during the extraction treatment, and this makes it difficult to perform the operation.
  • the pH of an acidic solution containing iron becomes 2.5 or more, hydroxides of iron are generated and the phase separation remarkably poorly proceeds.
  • an acidic solution containing an impurity element including at least iron as well as scandium as described above, it is preferable to adjust the pH thereof to a range of between 0.0 or more and 2.0 or less and to subject the acidic solution after pH adjustment to solvent extraction.
  • Solvent extractants for scandium extraction used in the following Examples and Comparative Examples were prepared as presented in the following Table 1.
  • 2-ethylhexylphosphonic acid 1-ethylhexyl (trade name: PC88A) was used as a phosphoric acid-based extractant and tri-n-octylphosphine oxide (trade name: TOPO) was used as a neutral extractant.
  • PC88A 2-ethylhexylphosphonic acid 1-ethylhexyl
  • TOPO tri-n-octylphosphine oxide
  • the mixed extractant used in Example 1 was obtained by dissolving the respective extractants in SWASOL (manufactured by MARUZEN PETROCHEMICAL CO., LTD.) so that the molar concentration of the phosphoric acid-based extractant (PC88A) was 0.1 mol/L and the molar concentration of the neutral extractant (TOPO) was 0.5 mol/L.
  • SWASOL manufactured by MARUZEN PETROCHEMICAL CO., LTD.
  • TOPO neutral extractant
  • the extractant used in Comparative Example 1 was obtained by dissolving the neutral extractant (TOPO) in SWASOL so that the molar concentration of the neutral extractant was 0.5 mol/L.
  • the extractant used in Comparative Example 2 was obtained by dissolving the phosphoric acid-based extractant (PC88A) in SWASOL so that the molar concentration of the phosphoric acid-based extractant was 0.6 mol/L.
  • the extractants used in Comparative Examples 1 and 2 are a single extractant composed of a phosphoric acid-based extractant or a neutral extractant.
  • Example 1 and Comparative Examples 1 and 2 sulfuric acid solutions (acidic solutions) respectively containing scandium (Sc), iron (Fe), and zirconium (Zr) or thorium (Th) in the concentrations presented in the following Table 2 were prepared.
  • Example 1 the sulfuric acid solution was divided into five portions by 2.5 ml for each, and the pH of the sulfuric acid solution was adjusted to a constant value in the range of 0.0 to 2.0. Thereafter, the respective sulfuric acid solutions were mixed with 2.5 ml of mixed extractant for scandium extraction (PC88A+TOPO), and the mixed solution was stirred at the number of revolutions of 650 rpm for 20 minutes. At this time, a 1 mol/L aqueous solution of sodium hydroxide was appropriately added to the mixed solution in order to maintain the pH of the sulfuric acid solution at the same value as that before mixing with the mixed extractant.
  • PC88A+TOPO mixed extractant for scandium extraction
  • the aqueous phase and organic phase of the mixed solution were separated from each other by using a separatory funnel, the extraction residual liquid (aqueous phase) was subjected to elemental analysis using an inductively coupled plasma atomic emission spectrometer (ICP-AES), and the extraction rates of various kinds of metals from the aqueous phase to the organic phase were determined.
  • ICP-AES inductively coupled plasma atomic emission spectrometer
  • Comparative Example 1 the extraction rates of various kinds of metals from the aqueous phase to the organic phase were determined by the same method as in Example 1 except that the sulfuric acid solution was divided into five portions by 2.5 ml for each, the pH of the sulfuric acid solution was adjusted to a constant value in the range of 0.0 to 2.5, and the neutral extractant (TOPO) was used as an extractant for scandium extraction.
  • the relation between the pH and the extraction rates of various kinds of metals are presented in the following Table 4 and FIG. 1 .
  • Example 1 it is possible to extract only scandium at a high yield by subjecting the acidic solution of a target for treatment to solvent extraction in a state in which the pH of the acidic solution is adjusted to a range of between 0.0 or more and 2.0 or less, preferably a range of between 1.7 or more and 2.0 or less and maintained in this range in the case of using a mixed extractant of a phosphoric acid-based extractant and a neutral extractant as an extractant for scandium extraction.
  • the characteristic feature is that scandium is uniformly extracted at an extraction rate of 60% or more regardless of the pH of the acidic solution when a mixed extractant is used as in Example 1. Meanwhile, iron contained in the acidic solution is not extracted at any pH and zirconium is hardly extracted at a pH of, for example, 1.7 or more.
  • the separation factors of scandium to Fe 3+ and Zr 4+ which are impurity elements when a mixed extractant is used in Example 1 are illustrated in FIG. 4 .
  • the generation of hydroxides of iron is likely to be promoted in an acidic solution containing a large amount of iron ions when the pH of the acidic solution exceeds 2.5 to 3.0.
  • the pH of an acidic solution is 0.0 or more and 2.0 or less prior to the solvent extraction treatment, it is possible to suppress the generation of hydroxides of iron, and moreover, it is possible to extract scandium at a sufficiently high extraction rate even from an acidic solution having a pH in a low region in which such hydroxides of iron are not generated by use of a mixed extractant of a phosphoric acid-based extractant and a neutral extractant.
  • Comparative Example 1 when an extractant composed only of a neutral extractant is used, there is no case in which the extraction rate of scandium exceeds 50% and the separation factors to the impurity elements are small regardless of the pH value of the acidic solution.
  • the separation factors of scandium to Fe 3+ and Zr 4+ which are impurity elements when an extractant composed only of a neutral extractant is used in Comparative Example 1 are illustrated in FIG. 5 .
  • a sulfuric acid solution (the following Table 7) into which scandium was leached by subjecting nickel oxide ore to an acid leaching treatment was subjected to solvent extraction using a mixed extractant (a mixed extractant of a phosphoric acid-based extractant and a neutral extractant) prepared as presented in the following Table 6.
  • a sulfuric acid solution obtained by adding a sulfurizing agent to a leachate obtained by subjecting actual nickel oxide ore to pressure sulfuric acid leaching by a known method and separating nickel and cobalt from the leachate by a sulfuration reaction was prepared.
  • this sulfuric acid solution contains impurities such as aluminum (Al), chromium (Cr), thorium (Th), and trivalent iron (Fe) and nickel (Ni) remaining in a trace amount as well as scandium (Sc).
  • the sulfuric acid solution was divided into six portions by 30 ml for each and the pH of the sulfuric acid solution was adjusted to a constant value in the range of 1.0 to 2.0. Thereafter, the respective sulfuric acid solutions were mixed with 30 ml of mixed extractant for scandium extraction (PC88A+TOPO), and the mixed solution was stirred at the number of revolutions of 650 rpm for 20 minutes. At this time, a 1 mol/L aqueous solution of sodium hydroxide was appropriately added to the mixed solution in order to maintain the pH of the sulfuric acid solution at the same value as that before mixing with the mixed extractant.
  • PC88A+TOPO mixed extractant for scandium extraction
  • the aqueous phase and organic phase of the mixed solution were separated from each other by using a separatory funnel, the extraction residual liquid (aqueous phase) was subjected to elemental analysis using an inductively coupled plasma atomic emission spectrometer (ICP-AES), and the extraction rates of various kinds of metals from the aqueous phase to the organic phase were determined.
  • ICP-AES inductively coupled plasma atomic emission spectrometer
  • solvent extraction was performed using a mixed extractant which contained a phosphoric acid-based extractant (PC88A) and a neutral extractant (TOPO) and in which the mixing proportion of the phosphoric acid-based extractant was set to 1% in terms of molar ratio by mixing TOPO: 500 mM with PC88A: 5 mM as presented in the following Table 10.
  • PC88A phosphoric acid-based extractant
  • TOPO neutral extractant
  • Example 7 The operation of solvent extraction was performed in the same manner as in Example 2 using the same sulfuric acid solution (Table 7) as that in Example 2 as a target for treatment and adjusting the pH of the sulfuric acid solution to three patterns of 1.0, 1.6, and 1.8, respectively. Thereafter, the aqueous phase and organic phase of the mixed solution were separated from each other by using a separatory funnel, the extraction residual liquid (aqueous phase) was subjected to elemental analysis using an inductively coupled plasma atomic emission spectrometer (ICP-AES), and the extraction rates of various kinds of metals from the aqueous phase to the organic phase were determined.
  • ICP-AES inductively coupled plasma atomic emission spectrometer
  • Example 4 the following mixed extractant was prepared and solvent extraction was performed.
  • di(2,4,4-trimethylpentyl)phosphinic acid (trade name: Cyanex272) was used as a phosphoric acid-based extractant and a mixed extractant was prepared by dissolving the respective extractants in SWASOL so that the molar concentration of the phosphoric acid-based extractant was 0.1 mol/L and the molar concentration of the neutral extractant (TOPO) was 0.5 mol/L.
  • a sulfuric acid solution containing scandium (Sc), iron (Fe), and zirconium (Zr) at the concentrations presented in the following Table 13 was prepared as a target for solvent extraction, and the sulfuric acid solution was divided into six portions by 30 ml for each and the pH thereof was adjusted to a constant value in the range of 1.0 to 2.0.
  • Example 2 The operation of solvent extraction was performed in the same manner as in Example 1. Thereafter, the aqueous phase and organic phase of the mixed solution were separated from each other by using a separatory funnel, the extraction residual liquid (aqueous phase) was subjected to elemental analysis using an inductively coupled plasma atomic emission spectrometer (ICP-AES), and the extraction rates of various kinds of metals from the aqueous phase to the organic phase were determined.
  • ICP-AES inductively coupled plasma atomic emission spectrometer
  • Example 4 From the results for Example 4, it is possible to efficiently separate scandium and impurity elements from each other and thus to purify scandium at a high purity even in the case of using a mixed extractant containing a phosphoric acid-based extractant different from that used in Example 1.
  • the separation factors of scandium to Fe 3+ and Zr 4+ which are impurity elements are illustrated in FIG. 11 .

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PH12021553270A1 (en) * 2019-07-11 2022-08-08 Sumitomo Metal Mining Co Method for recovering scandium

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PH12019500379A1 (en) 2019-10-21
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