US20090078087A1 - Process for the acid digestion of metal-containing compounds - Google Patents

Process for the acid digestion of metal-containing compounds Download PDF

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Publication number
US20090078087A1
US20090078087A1 US12/281,217 US28121707A US2009078087A1 US 20090078087 A1 US20090078087 A1 US 20090078087A1 US 28121707 A US28121707 A US 28121707A US 2009078087 A1 US2009078087 A1 US 2009078087A1
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Prior art keywords
acid
sulfuric acid
alkanesulfonic
metal
weight
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Abandoned
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US12/281,217
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English (en)
Inventor
Thomas Heidenfelder
Helmut Witteler
Bernd Laubusch
Hans-Peter Seelmann-Eggebert
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BASF SE
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BASF SE
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Assigned to BASF AKTIENGESELLSCHAFT reassignment BASF AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEELMANN-EGGEBERT, HANS-PETER, WITTELER, HELMUT, LAUBUSCH, BERND, HEIDENFELDER, THOMAS
Publication of US20090078087A1 publication Critical patent/US20090078087A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • C22B15/00—Obtaining copper
    • C22B15/0063—Hydrometallurgy
    • C22B15/0065—Leaching or slurrying
    • C22B15/0067—Leaching or slurrying with acids or salts thereof
    • C22B15/0071—Leaching or slurrying with acids or salts thereof containing sulfur
    • 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
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
    • C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
    • 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
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/16—Extraction of metal compounds from ores or concentrates by wet processes by leaching in organic solutions
    • C22B3/1608—Leaching with acyclic or carbocyclic agents
    • C22B3/1616—Leaching with acyclic or carbocyclic agents of a single type
    • C22B3/165—Leaching with acyclic or carbocyclic agents of a single type with organic acids
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/22—Obtaining zinc otherwise than by distilling with leaching with acids
    • 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
    • C22B3/34—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing sulfur, e.g. sulfonium
    • 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
    • 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 process for the acid digestion of metal-comprising compounds by leaching by means of an aqueous leachant, wherein the aqueous leachant comprises i) an alkanesulfonic acid and, if appropriate, sulfuric acid and/or ii) a mixture of one or more salts of alkanesulfonc acid. Furthermore, an aqueous leachant comprising one or more alkanesulfonic acids and, if appropriate, sulfuric acid and/or surfactant as well as an aqueous leachant containing one or more salts of alkanesulfonic acids, sulfuric acid and, if appropriate, surfactant is provided by the present invention.
  • the process of the invention is suitable, for example, for the winning of copper, for the production of TiO 2 or for the digestion of fluorspar (CaF 2 ) to produce hydrogen fluoride.
  • the minerals and ores have to be processed and the metals extracted therefrom.
  • One possibility is the “leaching process” in which the metal ions are extracted directly from the ore by means of acidic or basic aqueous solutions.
  • the leachant used depends on the type of ore and the occurrence in the respective deposit. In many cases, dilute sulfuric acid (from 1 to 5% by weight) has been found to be useful.
  • This process can be applied successfully to, for example, low-copper ores and waste products which have a copper content of less than 2% by weight, for example the copper-comprising residues obtained in the burning of pyrite in sulfuric acid manufacture.
  • These starting materials are, if necessary after prior roasting, treated with dilute sulfuric acid and the copper is isolated from the resulting copper sulfate solution by means of further work-up steps.
  • the usual way of extracting the copper is to make a heap of the copper-comprising material and then spray it from above with dilute sulfuric, so that the dilute sulfuric acid can percolate or trickle through the copper-comprising material.
  • the copper-enriched mother liquor collects at the bottom of the heap and is passed to further work-up.
  • the dilute sulfuric acid has to act on the copper for a period of up to a number of weeks in order to dissolve satisfactory amounts of metal ions from the ore.
  • the yields in copper winning by this process are low.
  • a process for the acid digestion of copper ores having a low copper content is described in U.S. Pat. No. 4,120,935.
  • the copper ore is wetted with concentrated sulfuric acid and is left for at least 3 days before the ore is washed with from 5 to 10 times the amount of low-concentration sulfuric acid.
  • German application DE 10 2004 063 500.5 describes the addition of surfactants to the dilute sulfuric acid to increase the yield.
  • the surfactants are selected so that in a concentration of from 0.01 to 0.3% by weight in a 2% strength aqueous H 2 SO 4 solution at 23° C. they lead to a reduction in the contact angle on glass by at least 100 after 1 second.
  • an increased yield of metal ions, based on the metal-comprising compound used, compared to the above-described processes should be achieved.
  • the object is achieved by a process for the acid digestion of metal-comprising compounds by leaching by means of an aqueous leachant, wherein the leachant i) comprises one or more alkanesulfonic acids and/or ii) a mixture of one or more salts of alkanesulfonic acids and sulfuric acid.
  • the leachant comprises in case of i) one or more alkanesulfonic acids and also sulfuric acid.
  • An advantage of the process of the invention is that the extraction of metal-comprising compounds by means of an aqueous solution comprising alkanesulfonic acid and sulfuric acid and/or a mixture of salt of alkanesulfonic acid and sulfuric acid leads to significantly higher yields of metal ions than are found in extraction by means of aqueous sulfuric acid without addition of alkanesulfonic acid and/or salt of alkanesulfonic acid.
  • the digestion can thus be carried out in a shorter time and/or using smaller amounts of leachant.
  • a further advantage is the very wide applicability of the process of the invention.
  • metals not only metals but also metal compounds such as TiO 2 can be produced, and, for example, CaF 2 -comprising compounds can also be digested by the process of the invention to produce hydrofluoric acid.
  • the use of salts of alkanesulfonic acids mixed with sulfuric acid furthermore has the advantage that salts of alkanesulfonic acids accumulating as waste products in other chemical processes can be used in a beneficial manner.
  • the process of the invention is in principle suitable for leaching any metal-comprising compounds in the case of which a metal can be dissolved from the respective compounds, for example ores, rock or minerals, by treatment with sulfuric acid.
  • the metal-comprising compounds which can be digested by the present process are, for example, oxides, sulfides, arsenides, chlorides, carbonates, phosphates or fluorides.
  • the zinc ores (zinc blend, smithsonite) are roasted before leaching.
  • Lanthanum and the lanthanides can be obtained by the acid digestion of cerite, monazite, turnerite and orthite according to the invention.
  • Uranyl sulfate which is processed further to obtain uranium, can be obtained from uranium ores by the process of the invention.
  • the metal comprised in the metal-comprising compound can be present in any oxidation state which is possible for the respective metal.
  • Leaching is frequently only an intermediate step in metal winning, in which the desired metal is dissolved from the rock and converted into a soluble form which is then subjected to further purification and work-up steps.
  • the pure metal is not the desired end product.
  • titanium minerals such as ilmenite (FeTiO 3 ) are digested for the production of TiO 2
  • bauxite is digested for the production of alum
  • aluminum hydroxide is digested for the production of aluminum sulfate.
  • the objective of the process is not always the extraction of the cation comprised in the mineral or in the ore but may instead be the extraction of the counterion.
  • the digestion of fluorspar (CaF 2 ) is utilized for producing hydrogen fluoride or the digestion of apatite Ca 5 (PO 4 ) 3 (F, OH, Cl) is employed for obtaining phosphoric acid.
  • the metal-comprising compounds comprising the desired anion as counterion can be digested by the process of the invention.
  • the aqueous leachant used according to the process of the invention comprises i) from 0.001 to 50% by weight of one or more alkanesulfonic acids, preferably from 0.01 to 10% by weight. If appropriate, the alkanesulfonic acid can also have a concentration above 50% by weight. Preference is given to using one alkanesulfonic acid.
  • the aqueous leachant used according to the process of the invention comprises ii) from 1 to 10% by weight of one or more salts of alkanesulfonic acids, from 90 to 99% by weight of sulfuric acid and, if appropriate, 0 to 5% by weight of surfactant.
  • alkanesulfonic acids whose alkyl radical has from 1 to 40 carbon atoms
  • alkanesulfonic acids can be prepared by methods known to those skilled in the art, for example by sulfoxidation of the corresponding alkanes.
  • the aqueous leachant comprises both alkanesulfonic acid and sulfuric acid.
  • concentration of sulfuric acid is in the range from 0 to 50% by weight, preferably from 0 to 10% by weight.
  • the sulfuric acid used is dilute sulfuric acid having a content of from 1 to 80 g/l of H 2 SO 4 , particularly preferably from 2 to 60 g/l of H 2 SO 4 , in particular from 5 to 40 g/l of H 2 SO 4 .
  • ammonium, alkaline and alkaline earth salts of the alkanesulfonic acids described precedingly are used as salts of alkanesulfonic acids.
  • ammonium and the alkaline salts especially preferred are ammonium and sodium salts of methanesulfonic acid, most preferred is the sodium salt of methanesulfonic acid (sodiummethanesulfonate).
  • the ratio of sulfuric acid to alkanesulfonic acid in the aqueous leachant according to the present invention is in the range from 1 000:1 to 1:1, preferably from 100:1 to 10:1.
  • the ratio of salt of alkanesulfonic acid to sulfuric acid is in the range of 1:9 to 1.99.
  • Mixtures of salt of alkanesulfonic acid and sulfuric acid typically contain 1 to 10% by weight of salt of alkane sulfonic acid and 90 to 99% by weight of sulfuric acid.
  • surfactants can be added to the aqueous leachant.
  • the surfactants used can be anionic, cationic, nonionic or amphoteric. Mixtures of the above-mentioned classes of surfactants can also be used. Preference is given to surfactants which after extraction of the metal from the metal-comprising material do not interfere in the further work-up of the extracted metal in the sulfuric acid solution. Thus, for example, the transfer of copper from the aqueous extraction phase into an organic phase should not be adversely affected. Suitable surfactant systems therefore have to be good wetting agents but poor emulsifiers. In a preferred embodiment of the present invention, use is therefore made of a surfactant which during the extraction of the aqueous phase with an organic phase does not significantly increase the time for phase separation to occur compared to phase separation without surfactant.
  • suitable surfactants should preferably be stable under the acidic conditions caused by the alkanesulfonic acid and, if present, the sulfuric acid in an aqueous phase and preferably be biodegradable, particularly preferably readily biodegradable.
  • surfactants which in a concentration of from 0.01 to 0.3% by weight, particularly preferably from 0.05 to 0.25% by weight, in particular from 0.1 to 0.2% by weight, in a 2% strength aqueous H 2 SO 4 solution at 23° C. lead to a reduction in the contact angle on glass by at least 100, particularly preferably at least 200, in particular at least 30°, especially at least 40°, after 1 second, particularly preferably after 0.5 second, in particular after 0.1 second.
  • the surfactants described in the German application number DE 10 2004 063 500.5 are particularly useful.
  • the surfactant can be selected from
  • surfactants of different classes for example anionic surfactants together with cationic surfactants, amphoteric surfactants together with nonionic surfactants, etc.
  • surfactants from 1, 2, 3 or 4 different classes of surfactant (nonionic, anionic, cationic and amphoteric).
  • the resulting aqueous composition comprising the surfactant has a contact angle on glass of less than 40°, particularly preferably less than 30°, in particular less than 20°.
  • the contact angle is measured on an extra-white glass microscope slide from Gerhard Menzel Glasbearbeitungswerk GmbH & Co. KG, Braunschweig, having a thickness of 1 mm.
  • the approximate composition of the glass microscope slide is as follows:
  • the glass microscope slide is cleaned with acetone and dried at 70° C. for 2 hours in a drying oven before measurement of the contact angle.
  • the amount of nonionic surfactant employed is, on the basis of experience, from 1 to 30 ppm, preferably from 1 to 20 ppm, particularly preferably from 2 to 15 ppm, in particular from 3 to 10 ppm, per metric ton of starting material. It has been found to be advantageous to use a higher concentration at the beginning of the extraction process than toward the end of the extraction.
  • the present invention further provides an aqueous leachant comprising
  • the present invention also provides an aqueous leachant comprising
  • the aqueous leachant may contain alkanesulfonic acid, salt of alkanesulfonic acid and sulfuric acid.
  • Leaching by the process of the invention of the metal-comprising compounds to be digested preferably means that the metal-comprising, if appropriate previously comminuted compounds are made into a heap and the aqueous leachant, i.e. the aqueous solution comprising alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant, subsequently percolates or trickles through the heaped-up material. Spraying of the metal-comprising compounds preferably occurs dropwise. After the metal or the desired anions have been separated off from the leachant, the latter is preferably used again for further extractions.
  • the aqueous leachant i.e. the aqueous solution comprising alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant
  • the metal-comprising compounds are firstly milled to give particles having a diameter of about 10 cm before leaching.
  • the milled particles are then heaped up, usually to form heaps made up of from 100 000 to 500 000 metric tons of starting material. These are then extracted according to the process of the present invention.
  • the leachant can comprise varying concentrations of alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant during the extraction process (gradient operation). Furthermore, part or all of the surfactants can be added to the starting material or rock before commencement of the extraction process, e.g. during milling of the material.
  • the starting material to be extracted can also be preferred for the starting material to be extracted to be firstly pretreated and wetted with a concentrated sulfuric acid and the starting material then to be washed with an excess of low-concentration sulfuric acid, as described in U.S. Pat. No. 4,120,935.
  • the metal-comprising compound can be pretreated with concentrated sulfuric acid and the desired anions or cations can then be extracted with an aqueous leachant comprising alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant and/or a mixture of one or more salts of alkane sulfonic acids and sulfuric acid as well as, if appropriate, surfactant.
  • Alkanesulfonic acid and/or surfactant and/or salt of alkanesulfonic acid can also be added to the concentrated sulfuric acid used for the pretreatment.
  • a concentrated sulfuric acid When a concentrated sulfuric acid is used for the pretreatment (wetting), its concentration is preferably from 25 to 500 g/l of H 2 SO 4 , particularly preferably from 50 to 400 g/l of H 2 SO 4 , in particular from 75 to 300 g/l of H 2 SO 4 .
  • the leachant used for the digestion may, if appropriate, comprise further additives for metal extraction which are known per se to those skilled in the art.
  • An example is iron(II) ions for copper winning, preferably in a concentration of from 5 to 50 g/l, based on the composition according to the invention.
  • the iron(III) ions are preferably used in the form of iron(III) sulfate in the composition according to the invention.
  • Further suitable additives are, for example, additives which stabilize Ca 2+ ions which often occur in association with copper. Examples are sodium polyacrylates. Further suitable additives are aluminum ions.
  • the leaching of the metal-comprising starting material is generally continued until the content of extracted metal is less than 1 g/l. Depending on the type of material to be extracted and its amount, times of from 5 days to a number of months are usual for this to be achieved.
  • a further suitable pretreatment for the copper-comprising starting material to be extracted according to the present invention is roasting. This is preferably effected by heating in roasting furnaces, for example rotary tube furnaces, multitier furnaces or fluidized-bed roasting furnaces, with admission of air. During roasting, sulfides, arsenides and antimonides of copper and associated metals are generally converted into the corresponding oxides.
  • the metal can be removed from the resulting aqueous mother liquor by extraction with a complexing agent soluble in organic media.
  • a complexing agent soluble in organic media for this purpose, it is possible to use, for example, organics-soluble complexing agents from Cognis (Lixe grades) and Cytec. Preference is given to 2-hydroxy-5-nonylacetophenone oxime, which is used in an organic solution (Shellsol®).
  • the copper can subsequently be transferred from the organic solution, preferably by means of aqueous sulfuric acid, into an aqueous, preferably strongly acidic phase and isolated therefrom by electrochemical means.
  • the extracted copper can alternatively be precipitated from the mother liquor obtained in the process of the invention by means of scrap iron.
  • This procedure generally referred to as “cementation”, is known per se to those skilled in the art. Cementation is usually followed by smelting of the copper obtained and electrolytic purification.
  • the process of the invention has a very wide range of uses.
  • the following processes for obtaining various raw materials from the corresponding metal-comprising compounds may be mentioned by way of example.
  • electrolytic zinc About 80% of the zinc produced nowadays is electrolytic zinc. This is obtained by roasting of the zinc ores, (conversion of the zinc ores such as zinc blend and smithsonite into zinc oxide) followed by leaching with sulfuric acid and precipitation of more noble accompanying metals (Pb, Ni, Cd, Co, Ag etc.) by introduction of zinc dust.
  • an aqueous solution of alkanesulfonic acid and, if appropriate sulfuric acid and/or surfactant is used for leaching the roasted zinc ores.
  • the process of the invention can also be used in lanthanum recovery.
  • the main raw material for the isolation of lanthanum is monazite sand.
  • the digestion of this with sulfuric acid is followed by precipitation of lanthanum together with the other rare earth materials as oxalate; a combination of precipitation, ion exchange and extraction processes (lanthanide separation) leads to pure lanthanum solutions from which lanthanum(III) oxalate is precipitated, ignited to give lanthanum(III) oxide and the latter is either heated together with carbon in a stream of chlorine to form lanthanum(III) chloride or is converted into lanthanum(III) fluoride by reaction with hydrogen fluoride in a rotary tube furnace.
  • the metal is finally obtained by melt electrolysis of lanthanum(III) chloride or reduction of lanthanum(III) fluoride with calcium/magnesium.
  • the digestion of the monazite sand is carried out using an aqueous leachant which comprises alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant.
  • the process of the invention can also be used in uranium recovery.
  • the ore is usually sorted according to the intensity of the radioactivity and milled.
  • Uranyl sulfate (UO 2 SO 4 ) is subsequently obtained by acid leaching.
  • the acid processes also include bacterial leaching by means of Thiobacillus ferrooxidans.
  • the uranium is obtained from the resulting solutions by ion exchange processes or by extraction with organic solvents.
  • the uranium is finally precipitated and dried to give marketable yellow cake (ammonium and/or magnesium diuranate).
  • an aqueous leachant comprising alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant can be used for the extraction of uranium from its ore.
  • the process of the invention can be used in the preparation of TiO 2 , too.
  • the metallic titanium slags which can be obtained from ilmenite (FeTiO 3 ) by reduction with coke are usually treated with concentrated sulfuric acid and the digestion cakes obtained here are dissolved in hot water or sodium hydroxide solution, resulting in precipitation of hydrated titanium dioxide which is calcined in rotary tube furnaces at 800-1000° C. to give finely particulate anatase or at >1000° C. to give coarsely particulate rutile.
  • the metallic titanium slag is, in the production of TiO 2 , treated with an aqueous leachant which comprises alkanesulfonic acid and, if appropriate, sulfuric acid and/or surfactant.
  • a further possible application of the process of the invention is the preparation of hydrogen fluoride.
  • This is usually prepared by digestion of fluorspar (CaF 2 ) with concentrated sulfuric acid.
  • the digestion can be carried out by means of an aqueous leachant which comprises alkanesulfonic acid and, if desired, sulfuric acid and/or surfactant.
  • the process of the invention can accordingly be employed in the digestion of many metal-comprising compounds. Preference is given to using copper-comprising, TiO 2 -comprising and CaF 2 -comprising compounds as metal-comprising compounds to be digested. Particular preference is given to winning copper with the aid of the process of the invention.
  • the copper-comprising mixtures are admixed at room temperature with the acid mixtures, stirred by means of a magnetic stirrer for 2.5 hours and allowed to stand overnight for 24 hours.
  • the digestion mixture is then filtered with suction on a filter having a pore opening of 0.45 ⁇ m, the filtrate is made up to 250 ml with distilled water and the copper content of the solution is determined.

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US12/281,217 2006-03-01 2007-02-28 Process for the acid digestion of metal-containing compounds Abandoned US20090078087A1 (en)

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EP06110545.8 2006-03-01
EP06110545 2006-03-01
PCT/EP2007/051899 WO2007099119A1 (de) 2006-03-01 2007-02-28 Verfahren zum sauren aufschluss von metallhaltigen verbindungen

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US20090272230A1 (en) * 2008-05-02 2009-11-05 Arafura Resources Limited Recovery of Rare Earth Elements
EP2439293A1 (de) * 2010-10-06 2012-04-11 Ferro Duo GmbH Verfahren zur Rückgewinnung von Lanthan aus lanthanhaltigen Zeolithen
US20140131220A1 (en) * 2012-11-13 2014-05-15 The University Of British Columbia Recovering lead from a lead material including lead sulfide
US20140131219A1 (en) * 2012-11-13 2014-05-15 The University Of British Columbia Recovering lead from a mixed oxidized material
US10435766B2 (en) 2015-01-26 2019-10-08 Basf Se Removal of radionuclides from mixtures
US10745778B2 (en) 2015-12-07 2020-08-18 Basf Se Leaching aids and methods of using leaching aids

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DE102014112952A1 (de) 2013-09-09 2015-03-12 Ulrich Loser Hydrometallurgisches Verfahren zur Verwertung von Seltenerdmetallboridabfällen
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