CN116426754A - Method for deeply removing cadmium from copper cobalt ore - Google Patents
Method for deeply removing cadmium from copper cobalt ore Download PDFInfo
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- CN116426754A CN116426754A CN202310237001.7A CN202310237001A CN116426754A CN 116426754 A CN116426754 A CN 116426754A CN 202310237001 A CN202310237001 A CN 202310237001A CN 116426754 A CN116426754 A CN 116426754A
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- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 86
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 70
- RYTYSMSQNNBZDP-UHFFFAOYSA-N cobalt copper Chemical compound [Co].[Cu] RYTYSMSQNNBZDP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 229910052751 metal Inorganic materials 0.000 claims abstract description 69
- 239000002184 metal Substances 0.000 claims abstract description 69
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 68
- 239000010941 cobalt Substances 0.000 claims abstract description 68
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000243 solution Substances 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 36
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052802 copper Inorganic materials 0.000 claims abstract description 33
- 239000010949 copper Substances 0.000 claims abstract description 33
- 239000002243 precursor Substances 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims abstract description 15
- 238000000151 deposition Methods 0.000 claims abstract description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 42
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 30
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 238000001556 precipitation Methods 0.000 claims description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- SNAMIIGIIUQQSP-UHFFFAOYSA-N bis(6-methylheptyl) hydrogen phosphate Chemical compound CC(C)CCCCCOP(O)(=O)OCCCCCC(C)C SNAMIIGIIUQQSP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000008267 milk Substances 0.000 claims description 3
- 210000004080 milk Anatomy 0.000 claims description 3
- 235000013336 milk Nutrition 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 239000012716 precipitator Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- -1 ethylhexyl phosphate mono-2-ethylhexyl phosphate Chemical compound 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000003814 drug Substances 0.000 abstract description 5
- 238000012946 outsourcing Methods 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000011701 zinc Substances 0.000 description 11
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 description 3
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005363 electrowinning Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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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
- 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
- C22B3/46—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes by substitution, e.g. by cementation
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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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
- C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
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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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
- C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
- C22B23/0469—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods by chemical substitution, e.g. by cementation
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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
- 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
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
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- C22B3/384—Pentavalent phosphorus oxyacids, esters thereof
- C22B3/3846—Phosphoric acid, e.g. (O)P(OH)3
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
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Abstract
The invention discloses a method for deeply removing cadmium from copper-cobalt ore, which comprises the steps of adding copper-containing feed liquid in a copper refining process into cobalt-precipitating precursor liquid in the copper-cobalt ore treatment process to obtain mixed liquid; adding metal powder into the mixed solution to replace cadmium removal, and carrying out solid-liquid separation to obtain cadmium-removed solution; and separating cobalt from the displaced metal from the cadmium-removed solution to obtain a purified cobalt product. The invention not only utilizes the copper-containing liquid generated by other working procedures in the copper-cobalt ore treatment process, but also effectively promotes the replacement and cadmium removal reaction depth of the metal powder in the cobalt-depositing precursor liquid under the conditions of no outsourcing of the medicament and no heating, reduces the replacement metal consumption, reduces the cadmium removal energy consumption, and achieves the purposes of saving the cadmium removal cost and improving the purity of cobalt products; and by formulating different subsequent separation processes of cobalt and replacement metal for different metal powder replacement cadmium removal processes, the application metal range of the metal powder replacement cadmium removal process in the prior art is effectively expanded, and more choices are provided for implementing the copper-cobalt ore deep cadmium removal process.
Description
Technical Field
The invention relates to the technical field of heavy metal recovery, in particular to a method for deeply removing cadmium from copper cobalt ores.
Background
Copper and cobalt ore are generally treated by separating copper, performing electrowinning recovery, separating residual cobalt and other impurity elements, and finally performing cobalt precipitation recovery on the material liquid after impurity removal. However, since the cobalt precipitation precursor solution sometimes contains a certain amount of cadmium, the pH of the cadmium and cobalt precipitation is relatively close, and if the cadmium cannot be deeply removed, the purity of the subsequent cobalt precipitation product is affected.
Metal powder displacement cadmium removal is a common feed solution cadmium removal mode in industry and is typically performed with metals having standard electrode potentials more negative than cadmium, such as zinc powder. However, because the standard electrode potential of cadmium is negative, the potential is little different from that of zinc, and the thermodynamic driving force is small, the zinc powder dosage is generally large, and the zinc powder needs to be carried out under the medium temperature condition (about 50 ℃), so that the cadmium end concentration after the cadmium removal by replacement can be ensured to meet the requirement.
Therefore, the method for realizing deep cadmium removal without heating can effectively reduce the consumption of replacement metal, and has important significance for reducing the cadmium removal cost in the copper-cobalt ore treatment process and improving the purity of cobalt-precipitated products.
Disclosure of Invention
The invention aims to fully combine the characteristics of the copper-cobalt ore, utilize copper-containing liquid generated in other working procedures in the copper-cobalt ore treatment process, effectively promote the metal powder to replace and remove cadmium reaction depth under the conditions of no outsourcing medicament and no heating, and realize the technical effect of no heating depth cadmium removal of the cobalt-precipitating precursor liquid of the copper-cobalt ore; meanwhile, by formulating different subsequent separation processes of cobalt and replacement metal for different metal powder replacement cadmium removal processes, the application metal range of the metal powder replacement cadmium removal is effectively expanded.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for deep cadmium removal of copper cobalt ore, the method comprising:
adding copper-containing feed liquid into cobalt-depositing precursor liquid in the copper-cobalt ore treatment process to obtain mixed liquid;
adding metal powder into the mixed solution to replace cadmium removal, and carrying out solid-liquid separation to obtain cadmium-removed solution;
and separating cobalt from the displaced metal from the cadmium-removed solution to obtain a purified cobalt product.
As a further improvement of the invention, the copper-containing feed liquid is an anode liquid of an electrodepositing copper process in the copper purification process of the copper cobalt mine.
As a further improvement of the invention, the molar ratio of copper to cadmium in the mixed solution is controlled to be (4-8): 1.
as a further improvement of the present invention, the metal powder is: lithium powder, potassium powder, sodium powder and magnesium powder.
As a further improvement of the present invention, the metal powder is: zinc powder.
As a further improvement of the present invention, the metal powder is: aluminum powder.
As a further improvement of the present invention, the separation of cobalt and the replacement metal is performed on the cadmium-removed liquid, and the purified cobalt product is obtained by:
and adding a first precipitator into the cadmium-removed liquid to precipitate cobalt, so as to obtain a cobalt product.
As a further improvement of the present invention, the separation of cobalt and the replacement metal is performed on the cadmium-removed liquid, and the purified cobalt product is obtained by:
adding an extracting agent into the cadmium-removed liquid, and extracting to remove the replacement metal to obtain a purified cobalt-precipitated precursor liquid;
and adding a first precipitant into the purified cobalt precipitation precursor solution to precipitate cobalt, thereby obtaining a cobalt product.
As a further improvement of the present invention, the separation of cobalt and the replacement metal is performed on the cadmium-removed liquid, and the purified cobalt product is obtained by:
adding a second precipitant into the cadmium-removed solution to remove the replacement metal, thereby obtaining purified cobalt-precipitated precursor solution;
and adding a first precipitant into the purified cobalt precipitation precursor solution to precipitate cobalt, thereby obtaining a cobalt product.
As a further improvement of the present invention, the first precipitant is one or both of sodium hydroxide and potassium hydroxide.
As a further improvement of the invention, the extractant is one or two of diisooctyl phosphate and ethylhexyl phosphate mono-2-ethylhexyl.
As a further improvement of the invention, the second precipitant is one or more of sodium hydroxide, potassium hydroxide and lime milk.
The beneficial effects of the invention are as follows:
according to the method for deeply removing cadmium from the copper-cobalt ore, the copper-containing feed liquid is added into the cobalt-precipitating precursor liquid in the copper-cobalt ore treatment process to obtain the mixed liquid; then adding metal powder into the mixed solution to replace cadmium removal, and carrying out solid-liquid separation to obtain cadmium-removed solution; and finally, separating cobalt from the displaced metal from the cadmium-removed solution to obtain a purified cobalt product. Through the mode, the method provided by the invention can effectively promote the reaction depth of the metal powder replacement cadmium removal, so that the replacement metal consumption in the metal powder replacement cadmium removal process is reduced, and the impurity cadmium in the cobalt-precipitating precursor solution can be deeply removed without heating.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a schematic flow chart of the method for deeply removing cadmium from copper-cobalt ore.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to meet the possible cadmium removal requirement of the cobalt-depositing precursor solution in the copper-cobalt ore treatment process, and solve the problems of large consumption, high reaction temperature requirement and the like in the cadmium removal of zinc powder in the prior art, the invention provides an improved strengthening method for replacing cadmium by metal powder, which can effectively promote the replacement of cadmium in the cobalt-depositing precursor solution, expand the application metal range of the existing metal powder when replacing the cadmium for removing the cadmium, reduce the cadmium removal cost, and realize that the end concentration of the cadmium can be reduced at normal temperature to meet the design requirement.
Specifically, the method for deeply removing cadmium from copper cobalt ore provided by the invention can be shown as a reference to fig. 1, and mainly comprises the following steps:
(1) Adding a certain amount of copper-containing feed liquid in a copper refining procedure into cobalt-depositing precursor liquid in the copper-cobalt ore treatment process to prepare mixed liquid. And controlling the mole ratio of copper to cadmium in the mixed solution to be (4-8): 1. preferably, the copper-containing feed liquid can be selected from anolyte in the process of electrodepositing copper in a copper refining process in the copper cobalt ore treatment process. Therefore, purchasing of the medicament from the outside can be avoided, and the cost is saved.
(2) Adding metal powder into the prepared mixed solution to replace cadmium, and carrying out solid-liquid separation to obtain cadmium-removed solution. Wherein, the metal of the metal powder can be divided into 3 types, and the 1 st type comprises: lithium (-3.04V), potassium (-2.931V), sodium (-2.713V), magnesium (-2.37V); class 2 includes: zinc (-0.7618V); class 3 includes: aluminum (-1.662V).
(3) And separating cobalt from the displaced metal from the cadmium-removed solution to obtain a purified cobalt product.
When the replacement metal is of class 1, cobalt can be directly precipitated by adding a precipitant since the replacement metal does not enter the cobalt product. The precipitant can be sodium hydroxide, potassium hydroxide, etc.
When the replacement metal is of the type 2, cadmium is removed, then the replacement metal is removed by liquid extraction, and the cobalt precipitation precursor liquid after preliminary purification is obtained. The extractant can be phosphoric acid extractant P204 (diisooctyl phosphate), P507 (ethylhexyl phosphoric acid mono-2-ethylhexyl) and the like. And adding a precipitant into the purified cobalt precipitation precursor solution to precipitate cobalt, thereby obtaining a final cobalt product. The precipitant is sodium hydroxide, potassium hydroxide, etc.
When the replacement metal is of the 3 rd class, the replacement metal needs to be removed by precipitation of cadmium-removing post-liquid to obtain purified cobalt-precipitating pre-liquid. The precipitant can be sodium hydroxide, potassium hydroxide, lime milk, etc. And adding a precipitator into the purified cobalt precipitation precursor solution to precipitate cobalt, thereby obtaining a final cobalt product. The precipitant is sodium hydroxide, potassium hydroxide, etc.
Therefore, the invention not only utilizes the copper-containing liquid generated by other working procedures in the copper-cobalt ore treatment process, but also effectively promotes the replacement of the metal powder in the cobalt-precipitating precursor liquid to remove cadmium reaction depth under the conditions of no outsourcing of the medicament and no heating, reduces the replacement metal consumption, reduces the cadmium removal energy consumption, saves the cadmium removal cost and improves the purity of cobalt products; in addition, the invention establishes different subsequent separation processes of cobalt and replacement metal for different metal powder replacement cadmium removing processes, effectively expands the application metal range of the metal powder replacement cadmium removing process in the prior art, and provides more choices for implementing the copper-cobalt ore deep cadmium removing process.
The implementation process and the use effect of the method for deeply removing cadmium from copper cobalt ores provided by the invention are described in detail below with reference to 3 specific examples.
Example 1:
1. adding a certain amount of anode liquid in the process of electrodepositing copper into cobalt-depositing precursor liquid in the process of treating copper-cobalt ore to obtain mixed liquid. Controlling the molar ratio of copper to cadmium in the mixed solution to be 4.95:1. as shown in table 1 below:
TABLE 1 content of essential elements of the mixture (mg/L)
| Co | Cd | Mg | Zn | Al | Cu |
| 3006 | 21 | 1500 | 980 | 1.6 | 104 |
2. Adding magnesium metal into the mixed solution to replace cadmium, and carrying out solid-liquid separation to obtain the cadmium-removed solution. The main components of the cadmium-removed liquid are shown in the following table 2:
TABLE 2 content of main elements of the cadmium-removed solution (mg/L)
| Co | Cd | Mg | Zn | Al | Cu |
| 2869 | 0.8 | 1735 | 1.8 | 0.9 | 1.2 |
3. And adding sodium hydroxide solution into the cadmium-removed solution to precipitate cobalt, and separating the cobalt from magnesium to obtain a purified cobalt hydroxide product, wherein the cadmium content is less than 0.05 percent and the magnesium content is less than 1 percent.
Example 2:
1. adding a certain amount of anode liquid in the process of electrodepositing copper into cobalt-depositing precursor liquid in the process of treating copper-cobalt ore to obtain mixed liquid. Controlling the molar ratio of copper to cadmium in the mixed solution to be 7.14:1. the main components of the mixture are shown in the following table 3:
TABLE 3 content of essential elements of the mixture (mg/L)
| Co | Cd | Mg | Zn | Al | Cu |
| 3006 | 21 | 1500 | 980 | 1.6 | 150 |
2. And adding metallic zinc into the mixed solution to replace cadmium, and carrying out solid-liquid separation to obtain the cadmium-removed solution. The main components of the obtained cadmium-removed liquid are shown in the following table 4:
TABLE 4 content of main elements of the cadmium-removed solution (mg/L)
3. Extracting the cadmium-removed liquid by P204 to remove zinc, separating the zinc-removed liquid from cobalt, adding sodium hydroxide solution into the obtained zinc-extracted liquid to precipitate cobalt, and obtaining a purified cobalt hydroxide product, wherein the cadmium content is less than 0.05%, the zinc content is less than 1%, and the magnesium content is less than 1%.
Example 3:
1. adding a certain amount of anode liquid in the process of electrodepositing copper into cobalt-depositing precursor liquid in the process of treating copper-cobalt ore to obtain mixed liquid. Controlling the molar ratio of copper to cadmium in the mixed solution to be 5.95:1. the main components of the obtained mixture are shown in the following table 5:
TABLE 5 content of essential elements of the mixture (mg/L)
| Co | Cd | Mg | Zn | Al | Cu |
| 3006 | 21 | 1500 | 980 | 1.6 | 125 |
2. Adding metal aluminum into the mixed solution to replace cadmium, and carrying out solid-liquid separation to obtain the cadmium-removed solution. The main components of the obtained cadmium-removed liquid are shown in the following table 6:
TABLE 6 content of main elements of the cadmium-removed solution (mg/L)
| Co | Cd | Mg | Zn | Al | Cu |
| 2913 | 0.3 | 1500 | 83 | 18 | 2.1 |
3. And adding sodium hydroxide solution into the cadmium-removed solution to control the pH value to 3-4, precipitating and removing aluminum, separating the solution from cobalt, and adding sodium hydroxide solution into the obtained aluminum-removed solution to precipitate cobalt, thereby obtaining a purified cobalt hydroxide product, wherein the cadmium content is less than 0.05%, the aluminum content is less than 1%, the zinc content is less than 1%, and the magnesium content is less than 1%.
In summary, according to the method for deeply removing cadmium from the copper-cobalt ore, the copper-containing feed liquid in the copper refining process is added into the cobalt-precipitating precursor liquid in the copper-cobalt ore treatment process to obtain the mixed liquid; then adding metal powder into the mixed solution to replace cadmium removal, and carrying out solid-liquid separation to obtain cadmium-removed solution; and finally, separating cobalt from the displaced metal from the cadmium-removed solution to obtain a purified cobalt product. Through the mode, the copper-containing liquid generated in other working procedures in the copper-cobalt ore treatment process is utilized, so that the replacement of metal powder in the cobalt-precipitating precursor liquid for removing cadmium reaction depth is effectively promoted under the conditions of no outsourcing of medicaments and no heating, the replacement metal consumption is reduced, the cadmium-removing energy consumption is reduced, and the purposes of saving the cadmium-removing cost and improving the purity of cobalt products are achieved; in addition, the invention establishes different subsequent separation processes of cobalt and replacement metal for different metal powder replacement cadmium removing processes, effectively expands the application metal range of the metal powder replacement cadmium removing process in the prior art, and provides more choices for implementing the copper-cobalt ore deep cadmium removing process. Therefore, the method has wide application prospect.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (12)
1. A method for deep cadmium removal of copper cobalt ore, the method comprising:
adding copper-containing feed liquid into cobalt-depositing precursor liquid in the copper-cobalt ore treatment process to obtain mixed liquid;
adding metal powder into the mixed solution to replace cadmium removal, and carrying out solid-liquid separation to obtain cadmium-removed solution;
and separating cobalt from the displaced metal from the cadmium-removed solution to obtain a purified cobalt product.
2. The method for deep cadmium removal of copper-cobalt ore according to claim 1, wherein,
the copper-containing feed liquid is an anode liquid of an electrodepositing copper process in the copper purification process of the copper cobalt mine.
3. The method for deep cadmium removal of copper-cobalt ore according to claim 1 or 2, wherein,
controlling the mole ratio of copper to cadmium in the mixed solution to be (4-8): 1.
4. the method for deep cadmium removal of copper-cobalt ore according to claim 1, wherein,
the metal powder is as follows: lithium powder, potassium powder, sodium powder and magnesium powder.
5. The method for deep cadmium removal of copper-cobalt ore according to claim 1, wherein,
the metal powder is as follows: zinc powder.
6. The method for deep cadmium removal of copper-cobalt ore according to claim 1, wherein,
the metal powder is as follows: aluminum powder.
7. The method for deep cadmium removal of copper-cobalt ore according to claim 4 wherein separating cobalt from the displaced metal from the post cadmium removal solution to obtain a purified cobalt product comprises:
and adding a first precipitator into the cadmium-removed liquid to precipitate cobalt, so as to obtain a cobalt product.
8. The method for deep cadmium removal of copper-cobalt ore according to claim 7, wherein,
the first precipitant is one or two of sodium hydroxide and potassium hydroxide.
9. The method for deep cadmium removal of copper-cobalt ore according to claim 5 wherein separating cobalt from the displaced metal from the post cadmium removal solution to obtain a purified cobalt product comprises:
adding an extracting agent into the cadmium-removed liquid, and extracting to remove the replacement metal to obtain a purified cobalt-precipitated precursor liquid;
and adding a first precipitant into the purified cobalt precipitation precursor solution to precipitate cobalt, thereby obtaining a cobalt product.
10. The method for deep cadmium removal of copper-cobalt ore according to claim 9, wherein,
the extractant is one or two of diisooctyl phosphate and ethylhexyl phosphate mono-2-ethylhexyl phosphate;
the first precipitant is one or two of sodium hydroxide and potassium hydroxide.
11. The method for deep cadmium removal of copper-cobalt ore according to claim 6 wherein separating cobalt from the displaced metal from the post cadmium removal solution to obtain a purified cobalt product comprises:
adding a second precipitant into the cadmium-removed solution to remove the replacement metal, thereby obtaining purified cobalt-precipitated precursor solution;
and adding a first precipitant into the purified cobalt precipitation precursor solution to precipitate cobalt, thereby obtaining a cobalt product.
12. The method for deep cadmium removal of copper-cobalt ore according to claim 11, wherein,
the second precipitant is one or more of sodium hydroxide, potassium hydroxide and lime milk;
the first precipitant is one or two of sodium hydroxide and potassium hydroxide.
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