CN111041212A - Gold leaching method for copper anode mud - Google Patents
Gold leaching method for copper anode mud Download PDFInfo
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- CN111041212A CN111041212A CN201911302039.8A CN201911302039A CN111041212A CN 111041212 A CN111041212 A CN 111041212A CN 201911302039 A CN201911302039 A CN 201911302039A CN 111041212 A CN111041212 A CN 111041212A
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- leaching
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- anode slime
- copper anode
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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
- 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
- C22B7/001—Dry processes
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/06—Sulfating roasting
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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
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
- C22B11/042—Recovery of noble metals from waste materials
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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
- C22B11/00—Obtaining noble metals
- C22B11/06—Chloridising
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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
- 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
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- 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
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a gold leaching method of copper anode slime, which comprises a sulfating roasting process, an acid leaching copper removal process and a chlorination gold separation process of the copper anode slime, wherein the chlorination gold separation process judges a process end point by monitoring the oxidation-reduction potential of a system. The method judges the gold leaching end point by monitoring the potential, maximizes the leaching rate of gold, avoids the waste of leaching agent and oxidant caused by adding excessive leaching agent and oxidant after reaching the end point, and saves the cost; the method of the invention is used for leaching the gold in the copper anode slime, and the leaching rate can reach more than 99.2 percent.
Description
Technical Field
The invention relates to the technical field of non-ferrous metal hydrometallurgy, in particular to a gold leaching method for copper anode slime.
Background
Gold is a rare strategic precious metal and is widely applied to the fields of gold ornaments, electronic communication, chemical engineering medical treatment technology and the like. Along with the continuous exploitation of single gold ore resources, secondary materials containing gold gradually become main raw materials for extracting gold. The copper anode slime contains a lot of rare metals, heavy metals and noble metals, is a valuable renewable resource, and becomes an important raw material for extracting noble metals such as gold, silver and the like. At present, the treatment of copper anode slime at home and abroad is mainly divided into a pyrogenic process and a wet process, the technology for treating the copper anode slime by the pyrogenic process is gradually mature and perfect, but the defects of more return slag, low direct recovery rate of precious metals, long production period and the like still exist. Therefore, at present, hydrometallurgical methods are often used in industry to treat copper anode slime to extract precious metals from the copper anode slime.
The wet method for treating the copper anode slime mainly comprises a sulfating roasting process, an acid leaching copper removal process and a chlorination gold separation process of the copper anode slime. However, the existing gold chlorination separation process has the problem that the leaching rate of gold is difficult to effectively control, and mainly shows that accurate information cannot be provided for operators to determine the leaching end point of gold, because the corresponding optimal addition amounts of a leaching agent and an oxidant are different along with the difference of the concentration of gold ions in a leaching solution in the reaction process, if the leaching end point cannot be judged, the relationship between the appropriate addition amounts of the leaching agent and the oxidant and the gold leaching concentration cannot be determined, the reagent consumption in the leaching process is difficult to accurately calculate, the reagent consumption is large, the operation blindness is caused, the cost is increased, and the leaching rate of gold is also influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the method for leaching gold from copper anode mud.
In order to solve the technical problems, the invention adopts the following technical scheme:
the gold leaching method of the copper anode slime comprises a sulfating roasting process, an acid leaching copper removal process and a chlorination gold separation process which are sequentially carried out, wherein the chlorination gold separation process judges a process end point by monitoring the oxidation-reduction potential of a system. The gold chlorination and separation process is essentially a redox reaction, and mainly comprises the following chemical reactions:
2Au+7Cl-+6H++ClO3 -＝2AuCl4 -+3H2O；
the redox potential is an important factor in determining the direction and extent of the redox reaction. Therefore, in the gold chlorination and separation process, the oxidation process of gold in the system is researched, and actually, the change process of the oxidation-reduction potential is realized. In the traditional gold leaching process, the leaching end point is generally judged by measuring the concentration of gold ions in a leaching solution, and in order to ensure the completeness of the leaching process, an excessive amount of leaching agent and an excessive amount of oxidizing agent are required to be added. The leaching end point of gold can be accurately judged by monitoring the oxidation-reduction potential of a system in the chlorination gold-separating process, so that the leaching rate of gold is maximized, and the waste of leaching agents and oxidants caused by excessive leaching after the end point is reached can be avoided.
Preferably, in the technical scheme, the specific operation of the chlorination gold separation process is that a leaching agent and an oxidant are continuously used for leaching the copper separation slag obtained in the acid leaching copper removal process, the leaching is stopped when the oxidation-reduction potential of the system is not changed, and the gold separation liquid and the gold separation slag are obtained through solid-liquid separation.
Preferably, the leaching agent is sulfuric acid and sodium chloride. The use of sulfuric acid and sodium chloride as leaching agents can avoid the problems of acid mist generation and leaching effect reduction when hydrochloric acid is used as a leaching agent in the prior art.
Preferably, the concentration of the sulfuric acid is 80g/L to 300 g/L. The leaching process can be in AuCl by limiting the concentration of sulfuric acid4-thermodynamically stable region of ensuring AuCl4 -The purpose of leaching gold is achieved.
Preferably, the concentration of the sodium chloride is 20g/L to 100 g/L. The leaching process can be carried out in AuCl by limiting the concentration of sodium chloride4 -The thermodynamic stability region of (1) ensures AuCl4 -The purpose of leaching gold is achieved.
Preferably, in the above technical solution, the oxidizing agent is hydrogen peroxide or sodium chlorate.
Preferably, in the above technical solution, in the process of leaching the copper-separating slag, the concentration of the hydrogen peroxide is 20% to 50%. The hydrogen peroxide with the concentration can ensure the leaching efficiency and leaching rate of gold.
Preferably, in the technical scheme, the concentration of the sodium chlorate is 20 g/L-100 g/L in the process of leaching the copper-separating slag. The sodium chlorate with the concentration can ensure the leaching efficiency and leaching rate of gold.
Preferably, the leaching time of the copper-separating slag is 60-240 min.
Preferably, the leaching temperature of the copper-separating slag is 30-80 ℃.
Preferably, in the above technical solution, the solid-to-liquid ratio of the copper-separating slag solid to the leaching agent and the oxidant liquid in the leaching process of the copper-separating slag is (1:3) - (3: 10).
Preferably, in the technical scheme, the mass fraction of gold in the copper-separating slag is 0.1-0.6%.
Preferably, the oxidation-reduction potential of the chlorination gold-separation process is 750 mv-850 mv when the chlorination gold-separation process reaches the end point.
Compared with the prior art, the invention has the advantages that: the invention judges whether the chlorination gold-separating process reaches the end point or not by monitoring the oxidation-reduction potential of the system, optimizes the reagent and parameters of the chlorination gold-separating process, maximizes the leaching rate of gold, avoids the waste of the leaching agent and the oxidizing agent caused by excessive leaching due to excessive addition of the leaching agent and the oxidizing agent after reaching the end point, and saves the cost; the method of the invention is used for leaching the gold in the copper anode slime, and the leaching rate can reach more than 99.2 percent.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The gold leaching method of the copper anode slime comprises a sulfating roasting process, an acid leaching copper removal process and a chlorination gold separation process which are sequentially carried out, wherein the chlorination gold separation process judges a process end point by monitoring the oxidation-reduction potential of a system, and the specific operation of the chlorination gold separation process comprises the following steps: preparing a sulfuric acid and sodium chloride mixed solution with the concentration of 200g/L and 60g/L respectively as a leaching agent, preparing a sodium chlorate solution with the concentration of 50g/L as an oxidant, continuously adding the leaching agent and the oxidant into the copper separation slag for gold leaching, wherein the adding amount ratio of the leaching agent to the oxidant in the gold leaching process is 4:1, controlling the leaching temperature to be 50 ℃, and stopping leaching when the potential does not change any more to obtain a gold separation liquid and a gold separation slag; at the moment, the end point potential is 820mv, the solid-to-liquid ratio of the copper separating slag to the added leaching agent and the oxidant is 1:5, the concentration of gold in the obtained gold separating solution reaches 1.8g/L, the gold leaching rate is 99.5 percent, and the total process time is 150 min.
Example 2
The gold leaching method of the copper anode slime comprises a sulfating roasting process, an acid leaching copper removal process and a chlorination gold separation process which are sequentially carried out, wherein the chlorination gold separation process judges a process end point by monitoring the oxidation-reduction potential of a system, and the specific operation of the chlorination gold separation process comprises the following steps: preparing 150g/L and 70g/L sulfuric acid and sodium chloride mixed solution as a leaching agent, preparing 30% hydrogen peroxide solution as an oxidant, continuously adding the leaching agent and the oxidant into the copper separation slag for gold leaching, wherein the addition ratio of the leaching agent to the oxidant in the gold leaching process is 6:1, controlling the leaching temperature to be 65 ℃, monitoring the system potential, and stopping leaching when the potential does not change any more to obtain a gold separation liquid and gold separation slag; at the moment, the end point potential is 780mv, the solid-to-liquid ratio of the copper separating slag to the added leaching agent and the oxidant is 1:7, the concentration of gold in the obtained gold separating solution reaches 1.5g/L, the gold leaching rate is 99.25 percent, and the total process time is 100 min.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (10)
1. The gold leaching method of the copper anode slime comprises a sulfating roasting process, an acid leaching copper removal process and a chlorination gold separation process which are sequentially carried out, and is characterized in that the chlorination gold separation process judges a process end point by monitoring the oxidation-reduction potential of a system.
2. The gold leaching method of copper anode slime according to claim 1, characterized in that the specific operation of the chlorination gold separation process comprises the following steps: and continuously using a leaching agent and an oxidant to leach the copper separation slag obtained in the acid leaching and copper removing process, stopping leaching when the reaction is carried out until the oxidation-reduction potential of the system is not changed any more, and carrying out solid-liquid separation to obtain a gold separation liquid and a gold separation slag.
3. The method of gold leaching of copper anode slime according to claim 2, wherein said leaching agents are sulfuric acid and sodium chloride.
4. The method for leaching gold of copper anode slime according to claim 3, wherein the concentration of said sulfuric acid is 80-300 g/L.
5. The method for leaching gold from copper anode slime as set forth in claim 4, wherein the concentration of said sodium chloride is 20g/L to 100 g/L.
6. The process for the leaching of gold from copper anode slime as claimed in claim 2, wherein said oxidizing agent is hydrogen peroxide or sodium chlorate.
7. The method for leaching gold from copper anode slime as recited in claim 6, wherein said hydrogen peroxide concentration is 20-50%.
8. The method for leaching gold from copper anode slime as set forth in claim 6, wherein said concentration of sodium chlorate is 20g/L to 100 g/L.
9. The method for leaching gold from copper anode slime as recited in any one of claims 2 to 8, wherein the leaching time of said copper-separated slag is 60min to 240 min.
10. The method for leaching gold from copper anode slime according to any one of claims 2 to 8, wherein the solid-to-liquid ratio of the copper separation slag solid to the leaching agent and the oxidant liquid in the leaching process of the copper separation slag is (1:3) - (3: 10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911302039.8A CN111041212A (en) | 2019-12-17 | 2019-12-17 | Gold leaching method for copper anode mud |
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| CN201911302039.8A CN111041212A (en) | 2019-12-17 | 2019-12-17 | Gold leaching method for copper anode mud |
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| CN111041212A true CN111041212A (en) | 2020-04-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593203A (en) * | 2020-05-20 | 2020-08-28 | 金川集团股份有限公司 | Method for separating and extracting gold and palladium from high-palladium-content silver anode mud |
| CN112504909A (en) * | 2020-11-07 | 2021-03-16 | 韶关凯鸿纳米材料有限公司 | Method for measuring ammonium bicarbonate content and zinc oxide production process for controlling ammonium bicarbonate dosage |
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| CN104878209A (en) * | 2015-06-15 | 2015-09-02 | 中南大学 | Method of leaching gold and silver targets in copper anode mud |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593203A (en) * | 2020-05-20 | 2020-08-28 | 金川集团股份有限公司 | Method for separating and extracting gold and palladium from high-palladium-content silver anode mud |
| CN111593203B (en) * | 2020-05-20 | 2022-03-15 | 金川集团股份有限公司 | Method for separating and extracting gold and palladium from high-palladium-content silver anode mud |
| CN112504909A (en) * | 2020-11-07 | 2021-03-16 | 韶关凯鸿纳米材料有限公司 | Method for measuring ammonium bicarbonate content and zinc oxide production process for controlling ammonium bicarbonate dosage |
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Application publication date: 20200421 |