WO2006027412A1 - Preparation of zinc chemicals from the minor flow of a process - Google Patents

Preparation of zinc chemicals from the minor flow of a process Download PDF

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Publication number
WO2006027412A1
WO2006027412A1 PCT/FI2005/000380 FI2005000380W WO2006027412A1 WO 2006027412 A1 WO2006027412 A1 WO 2006027412A1 FI 2005000380 W FI2005000380 W FI 2005000380W WO 2006027412 A1 WO2006027412 A1 WO 2006027412A1
Authority
WO
WIPO (PCT)
Prior art keywords
zinc
extraction
preparation
dissolving
solution
Prior art date
Application number
PCT/FI2005/000380
Other languages
French (fr)
Inventor
Mikko Ruonala
Original Assignee
Outokumpu Technology Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Outokumpu Technology Oyj filed Critical Outokumpu Technology Oyj
Priority to MX2007002750A priority Critical patent/MX2007002750A/en
Priority to JP2007530727A priority patent/JP2008512569A/en
Priority to EP05779682A priority patent/EP1794334A1/en
Priority to AU2005281684A priority patent/AU2005281684A1/en
Priority to CA002577863A priority patent/CA2577863A1/en
Priority to US11/662,061 priority patent/US20070253878A1/en
Priority to EA200700420A priority patent/EA010853B1/en
Publication of WO2006027412A1 publication Critical patent/WO2006027412A1/en

Links

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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/26—Refining solutions containing zinc values, e.g. obtained by leaching zinc ores
    • 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
    • C22B3/04—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
    • C22B3/20—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
    • C22B3/3846—Phosphoric acid, e.g. (O)P(OH)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
    • C22B3/385—Thiophosphoric acids, or esters thereof
    • 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 invention relates to the preparation processes of zinc and zinc chemicals. To be more precise, the invention relates to a process arrangement and circuit for preparing zinc chemicals in connection with a hydrometallurgical purification and preparation process of zinc.
  • the primary production refers to various dissolutions of zinc ores, zinc concentrates and calcines and the treatment of solutions obtained therefrom by means of various hydrometallurgical methods, including liquid- liquid extraction.
  • the secondary production refers to the use of various raw ma ⁇ terials of lesser volumes, such as particulates of electric furnaces, Waeltz ox ⁇ ides and galvanizing cinders, as raw material.
  • the solution ob- tained from the neutral dissolution contains bivalent iron, cadmium, copper, co ⁇ balt, nickel, calcium, manganese and chlorides.
  • the solu ⁇ tion obtained from the neutral dissolution is purified by a multi-stage solution purification process.
  • the solution purification comprises three stages, wherein copper, cobalt, nickel, and finally, cadmium are removed.
  • the zinciferous sulphate solution obtained from the neutral dissolution is also suitable for a feed material in the leaching method of zinc.
  • the liquid-liquid extraction has been used for zinc preparation mainly in small-scale processes that employ secondary raw materials.
  • the US Patent 5,135,652 describes a solvent extraction that can be used to selectively sepa ⁇ rate zinc from the zinc sulphate solution, which may contain zinc sulphate up to its saturation concentration, and one or more of a group containing the follow- ing: bivalent iron, trivalent iron, calcium, magnesium, manganese, sodium, po ⁇ tassium, arsenic, antimony, copper, cadmium, germanium, and indium.
  • the purpose of this invention is to provide a new kind of a process arrangement for producing pure zinc chemicals from the minor flow of a zinc preparation process of a calcining-dissolving-electrolysis type.
  • the invention is based on the fact that part of the production of the zinc sulphate-containing solution ob ⁇ tained from the dissolving of the calcining-dissolving-electrolysis plant is di ⁇ rected to the preparation of zinc chemicals. As only part of the production of the zinc sulphate solution is directed to the preparation of zinc chemicals, the ac- tual recovery process of zinc that is based on the electrolysis is not disturbed.
  • the preparation process of zinc chemicals is based on a selective separation of zinc by extraction with known extraction techniques.
  • the known extraction process is based on the use of any organically substituted phosphoric acid or organically substituted thiophosphinic acid.
  • the extraction process is con ⁇ nected to the calcining-dissolving-electrolysis process described above.
  • the invention provides considerable advantages.
  • the bottleneck of the production lies in the elec ⁇ trolysis process.
  • the solution according to the invention for taking the minor flow to the preparation line of zinc chemicals adds value to the actual production process of zinc.
  • the invention provides an advantageous process solution for the preparation of zinc chemicals of a lesser demand.
  • a strong acid solution is generated as a by-product, which can simply be recycled to be exploited in the preparation process of zinc. In that case, no separate investments for the final treatment of the acid solution are needed.
  • the invention comprises a process circuit and arrangement for preparing pure zinc chemicals from a zinc sulphate-containing solution by an extraction method, whereby the raw material flow of the extraction is separated as a minor flow from the calcining-dissolving-electrolysis type process line of zinc primary production after the neutral dissolving stage.
  • Fig. 1 shows a simplified process chart of the calcining-dissolving-electrolysis type preparation process of zinc and the preparation stage of zinc chemicals connected thereto.
  • a calcine 10 containing zinc oxide is dissolved in a sulphuric-acid solution in a neutral dissolution.
  • the neutral dissolution is typi ⁇ cally carried out in several stages.
  • a solution residue 12 which is not soluble in the dissolution and contains iron, among others, is directed to a strong acid dis ⁇ solution.
  • a zinc sulphate-containing solution 11 is directed to a multi-stage solu ⁇ tion purification, wherein a zinc powder 14 is used to precipitate copper, cobalt, nickel and cadmium.
  • The. solution-purified zinc sulphate solution 15 is directed to an electrolysis plant, wherein the zinc is recovered at cathodes 16 by means of electrolysis.
  • the electrolyte, from which the zinc was recovered 17 contains a considerable amount of sulphuric acid, which is reintroduced by directing it to the strong acid dissolution, among others.
  • the strong acid dissolution the acid is used up in reactions. Accordingly, in addition to the recycled acid, a cer- tain amount of pure acid is added into the process.
  • the pH of the solution should not be raised too high. It is reasonable to adjust the pH of the neutral dissolution with fresh acid and, in addition, with an acid 18 that is obtained from the strong acid dissolution.
  • a minor flow 13 is separated from the main flow 11 of the zinc sulphate-containing solution obtained from the neutral dissolution, and directed to the extraction of zinc.
  • DEHPA diethylhexylphosphoric acid
  • D2EHPA di-2-ethylhexylphosphoric acid
  • Zinc is separated from the organic phase by stripping it with an acid-containing solution 21.
  • the raffinate 19, which is generated in the extraction, contains sulphuric acid, among others, and is directed to the strong acid stage to be reused.
  • the pure zinc can be recovered in a sul ⁇ phuric-acid solution, wherein the content of zinc can be up to 150g/l.
  • Various pure zinc products can be prepared from this solution 20 by any known meth ⁇ ods, such as by chemical precipitation or evaporation.

Abstract

The invention is a novel process arrangement for producing pure zinc chemicals from the minor flow of a calcining-dissolving-electrolysis type of a preparation process of zinc. The invention is based on the fact that part of the production of the zinc sulphate-containing solution obtained from the dissolution of the calcining-dissolving-electrolysis plant is directed to the preparation of zinc chemicals. The actual recovery process of zinc, which is based on electrolysis, is not disturbed, as only part of the production of the zinc sulphate solution is directed to the preparation of zinc chemicals. The extraction process is based on the use of any organically substituted phosphoric acid or organically substituted thiophosphinic acid. The strong acid solution, which is generated as a by-product in the extraction process of zinc, is recycled back to the calcining-dissolving-electrolysis type of a preparation process of zinc.

Description

Preparation of zinc chemicals from the minor flow of a process
The invention relates to the preparation processes of zinc and zinc chemicals. To be more precise, the invention relates to a process arrangement and circuit for preparing zinc chemicals in connection with a hydrometallurgical purification and preparation process of zinc.
In connection with zinc preparation, primary and secondary preparations are often mentioned. The primary production refers to various dissolutions of zinc ores, zinc concentrates and calcines and the treatment of solutions obtained therefrom by means of various hydrometallurgical methods, including liquid- liquid extraction. The secondary production refers to the use of various raw ma¬ terials of lesser volumes, such as particulates of electric furnaces, Waeltz ox¬ ides and galvanizing cinders, as raw material.
In the primary production of zinc, traditional original materials, such as sulphide zinc ores, are concentrated, i.e., a zinc concentrate, and when so desired, also zinc calcine are further prepared from them. Further, a concentrated zinc sul¬ phate solution is often produced from the zinc concentrate and the zinc calcine, being well-suited for the electrolytic preparation of zinc metal. The present in¬ vention relates to the traditional hydrometallurgical primary production of zinc.
In the traditional hydrometallurgical production of zinc, complex solution purifi¬ cation is needed after the dissolution of the raw material, comprising the prepa- ration of a pure zinciferous solution. The electrolytic preparation of zinc is very sensitive to certain impurity agents. Therefore, it is important to prepare a suffi¬ ciently pure solution for the zinc electrolysis.
For the preparation of zinc, a method is widely used, wherein zinc concentrate is calcined to form zinc oxide, the zinc oxide is dissolved in a diluted sulphuric- acid solution in a so-called neutral dissolution, the zinciferous solution is puri¬ fied, and zinc is separated from the purified solution by electrolytic separation. At the dissolving stage of the zinc calcine, the zinc dissolves and the major part of the iron contained by the zinc calcine can be separated as zinc ferrite that does not dissolve in the diluted acid. In addition to the zinc, the solution ob- tained from the neutral dissolution contains bivalent iron, cadmium, copper, co¬ balt, nickel, calcium, manganese and chlorides.
To obtain a solution that is suitable for the electrolytic recovery of zinc, the solu¬ tion obtained from the neutral dissolution is purified by a multi-stage solution purification process. Normally, the solution purification comprises three stages, wherein copper, cobalt, nickel, and finally, cadmium are removed.
The zinciferous sulphate solution obtained from the neutral dissolution is also suitable for a feed material in the leaching method of zinc. Until recently, the liquid-liquid extraction has been used for zinc preparation mainly in small-scale processes that employ secondary raw materials. The US Patent 5,135,652, for example, describes a solvent extraction that can be used to selectively sepa¬ rate zinc from the zinc sulphate solution, which may contain zinc sulphate up to its saturation concentration, and one or more of a group containing the follow- ing: bivalent iron, trivalent iron, calcium, magnesium, manganese, sodium, po¬ tassium, arsenic, antimony, copper, cadmium, germanium, and indium.
The purpose of this invention is to provide a new kind of a process arrangement for producing pure zinc chemicals from the minor flow of a zinc preparation process of a calcining-dissolving-electrolysis type. The invention is based on the fact that part of the production of the zinc sulphate-containing solution ob¬ tained from the dissolving of the calcining-dissolving-electrolysis plant is di¬ rected to the preparation of zinc chemicals. As only part of the production of the zinc sulphate solution is directed to the preparation of zinc chemicals, the ac- tual recovery process of zinc that is based on the electrolysis is not disturbed. In the process arrangement according to the invention, the preparation process of zinc chemicals is based on a selective separation of zinc by extraction with known extraction techniques. The known extraction process is based on the use of any organically substituted phosphoric acid or organically substituted thiophosphinic acid. According to the invention, the extraction process is con¬ nected to the calcining-dissolving-electrolysis process described above.
The invention provides considerable advantages. In the conventional calcining- dissolving-electrolysis process, the bottleneck of the production lies in the elec¬ trolysis process. Accordingly, the solution according to the invention for taking the minor flow to the preparation line of zinc chemicals adds value to the actual production process of zinc. The invention provides an advantageous process solution for the preparation of zinc chemicals of a lesser demand. In the extrac¬ tion process of zinc used in the invention, a strong acid solution is generated as a by-product, which can simply be recycled to be exploited in the preparation process of zinc. In that case, no separate investments for the final treatment of the acid solution are needed.
The invention comprises a process circuit and arrangement for preparing pure zinc chemicals from a zinc sulphate-containing solution by an extraction method, whereby the raw material flow of the extraction is separated as a minor flow from the calcining-dissolving-electrolysis type process line of zinc primary production after the neutral dissolving stage.
Fig. 1 shows a simplified process chart of the calcining-dissolving-electrolysis type preparation process of zinc and the preparation stage of zinc chemicals connected thereto.
In the following, the invention is described in detail with reference to the ap¬ pended drawing.
In the preparation of zinc, a calcine 10 containing zinc oxide is dissolved in a sulphuric-acid solution in a neutral dissolution. The neutral dissolution is typi¬ cally carried out in several stages. A solution residue 12, which is not soluble in the dissolution and contains iron, among others, is directed to a strong acid dis¬ solution. A zinc sulphate-containing solution 11 is directed to a multi-stage solu¬ tion purification, wherein a zinc powder 14 is used to precipitate copper, cobalt, nickel and cadmium. The. solution-purified zinc sulphate solution 15 is directed to an electrolysis plant, wherein the zinc is recovered at cathodes 16 by means of electrolysis. The electrolyte, from which the zinc was recovered 17, contains a considerable amount of sulphuric acid, which is reintroduced by directing it to the strong acid dissolution, among others. In the strong acid dissolution, the acid is used up in reactions. Accordingly, in addition to the recycled acid, a cer- tain amount of pure acid is added into the process. In the neutral dissolution, the pH of the solution should not be raised too high. It is reasonable to adjust the pH of the neutral dissolution with fresh acid and, in addition, with an acid 18 that is obtained from the strong acid dissolution.
According to the invention, a minor flow 13 is separated from the main flow 11 of the zinc sulphate-containing solution obtained from the neutral dissolution, and directed to the extraction of zinc. In the extraction, diethylhexylphosphoric acid (DEHPA) or di-2-ethylhexylphosphoric acid (D2EHPA) is exploited. To¬ wards the end of the dissolving stage, the pH of the solution that is going to the extraction can be raised to a level suitable for the extraction, when needed, by means of the calcine. Zinc is separated from the organic phase by stripping it with an acid-containing solution 21. The raffinate 19, which is generated in the extraction, contains sulphuric acid, among others, and is directed to the strong acid stage to be reused.
In stripping, wherein pure acid is used, the pure zinc can be recovered in a sul¬ phuric-acid solution, wherein the content of zinc can be up to 150g/l. Various pure zinc products can be prepared from this solution 20 by any known meth¬ ods, such as by chemical precipitation or evaporation.

Claims

CLAIMS:
1. A process circuit for preparing pure zinc chemicals from a zinc sul- phate-containing solution by means of an extraction method, charac¬ terized in that the raw material flow of the extraction is separated as a minor flow (13) from the calcining-dissolving-eiectrolysis type of a process line (11) of the zinc primary production after a neutral dissolu¬ tion stage.
2. A process arrangement according to Claim 1 , characterized in that a raffinate (19) that is generated in the extraction is directed to be re¬ used in the strong acid dissolution of the said calcining-dissolving- electrolysis type of a process.
3. A process arrangement according to Claim 1 , characterized in that diethylhexylphosphoric acid (DEHPA) or di-2-ethylhexylphosphoric acid (D2EHPA) is exploited in the extraction.
4. A process arrangement according to Claim 1 , characterized in that towards the end of the dissolving stage, the pH of the solution going to the extraction is raised to a level suitable for the extraction by means of a calcine.
PCT/FI2005/000380 2004-09-08 2005-09-06 Preparation of zinc chemicals from the minor flow of a process WO2006027412A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
MX2007002750A MX2007002750A (en) 2004-09-08 2005-09-06 Preparation of zinc chemicals from the minor flow of a process.
JP2007530727A JP2008512569A (en) 2004-09-08 2005-09-06 Formation of zinc drugs from treatment tributaries.
EP05779682A EP1794334A1 (en) 2004-09-08 2005-09-06 Preparation of zinc chemicals from the minor flow of a process
AU2005281684A AU2005281684A1 (en) 2004-09-08 2005-09-06 Preparation of zinc chemicals from the minor flow of a process
CA002577863A CA2577863A1 (en) 2004-09-08 2005-09-06 Preparation of zinc chemicals from the minor flow of a process
US11/662,061 US20070253878A1 (en) 2004-09-08 2005-09-06 Preparation of Zinc Chemicals from the Minor Flow of a Process
EA200700420A EA010853B1 (en) 2004-09-08 2005-09-06 Producing zinc chemicals from the minor flow of the process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20041163A FI117139B (en) 2004-09-08 2004-09-08 Production of zinc chemicals from process stream
FI20041163 2004-09-08

Publications (1)

Publication Number Publication Date
WO2006027412A1 true WO2006027412A1 (en) 2006-03-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2005/000380 WO2006027412A1 (en) 2004-09-08 2005-09-06 Preparation of zinc chemicals from the minor flow of a process

Country Status (11)

Country Link
US (1) US20070253878A1 (en)
EP (1) EP1794334A1 (en)
JP (1) JP2008512569A (en)
CN (1) CN100406593C (en)
AU (1) AU2005281684A1 (en)
CA (1) CA2577863A1 (en)
EA (1) EA010853B1 (en)
FI (1) FI117139B (en)
MX (1) MX2007002750A (en)
PE (1) PE20060757A1 (en)
WO (1) WO2006027412A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102148A (en) * 2010-12-15 2011-06-22 河南豫光锌业有限公司 Recycling method of indium raffinate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103160688B (en) * 2013-04-17 2015-08-05 昆明奥赛美科技有限公司 Zinc replacement prepares the method for germanium concentrate from germanic leach liquor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3989607A (en) * 1975-08-21 1976-11-02 Bush Philip D Solvent extraction and electrowinning of zinc and copper from sulfate solution
US5135652A (en) * 1990-10-25 1992-08-04 Cominco Ltd. Method for the solvent extraction of zinc

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084180A (en) * 1990-10-25 1992-01-28 Cominco Ltd. Method for treating zinc-containing sulfate solution
US5358700A (en) * 1992-10-05 1994-10-25 Cyprus Power Company Method of extracting zinc from brines
CN1040554C (en) * 1994-03-02 1998-11-04 张振逵 Technology and equipment for coproducing zinc sulfate and lead concentrate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3989607A (en) * 1975-08-21 1976-11-02 Bush Philip D Solvent extraction and electrowinning of zinc and copper from sulfate solution
US5135652A (en) * 1990-10-25 1992-08-04 Cominco Ltd. Method for the solvent extraction of zinc

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102148A (en) * 2010-12-15 2011-06-22 河南豫光锌业有限公司 Recycling method of indium raffinate
CN102102148B (en) * 2010-12-15 2012-10-24 河南豫光锌业有限公司 Recycling method of indium raffinate

Also Published As

Publication number Publication date
CN100406593C (en) 2008-07-30
EA200700420A1 (en) 2007-10-26
AU2005281684A1 (en) 2006-03-16
PE20060757A1 (en) 2006-09-14
FI117139B (en) 2006-06-30
EP1794334A1 (en) 2007-06-13
FI20041163A (en) 2006-03-09
MX2007002750A (en) 2007-05-18
EA010853B1 (en) 2008-12-30
CN101014723A (en) 2007-08-08
FI20041163A0 (en) 2004-09-08
CA2577863A1 (en) 2006-03-16
JP2008512569A (en) 2008-04-24
US20070253878A1 (en) 2007-11-01

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