CN112442599A - Method for efficiently separating platinum and palladium from gold extraction residual liquid - Google Patents
Method for efficiently separating platinum and palladium from gold extraction residual liquid Download PDFInfo
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- CN112442599A CN112442599A CN202011327936.7A CN202011327936A CN112442599A CN 112442599 A CN112442599 A CN 112442599A CN 202011327936 A CN202011327936 A CN 202011327936A CN 112442599 A CN112442599 A CN 112442599A
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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
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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
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Abstract
The invention discloses a method for efficiently separating platinum and palladium from gold extraction residual liquid, which comprises the following steps: (1) mixing sodium bisulfite with the gold extraction residual liquid to obtain mixed feed liquid; (2) adjusting the acidity of the mixed feed liquid to 1-1.5 mol/L; adjusting the temperature of the mixed material liquid to 70-80 ℃; (3) and (3) controlling the end point potential of the mixed material liquid after the acidity and the temperature are adjusted in the step (2) to be 350 mv-420 mv, and obtaining the platinum and the palladium separated from the gold extraction residual liquid. The concentration of the platinum and the palladium obtained by the method can reach below 0.05g/L, compared with the existing platinum and palladium reduction process, the platinum and palladium separation effect is greatly improved, the problem of loss in the platinum and palladium refining process is solved, and the method can be applied to the high-efficiency separation and purification treatment process of the platinum and the palladium in the gold extraction residual liquid of the precious metal hydrometallurgy process.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for efficiently separating platinum and palladium from gold extraction residual liquid.
Background
The method for efficiently separating platinum and palladium from the gold extraction residual liquid by the platinum and palladium reduction method has been used in China for many years, and mainly comprises the step of precipitating platinum and palladium by using a D-sodium erythorbate reagent in the precious metal refining process to realize base metal separation and separation of platinum and palladium and other impurity metals. However, in long-term industrial application, when the platinum palladium is precipitated by adopting a reduction method, the operation has higher requirements on temperature and acidity, and the change of acidity in the reduction process is larger and is difficult to control; the reduction reagent has stronger activity and can simultaneously reduce the rest base metals in the solution; the reduction effect is not thorough, and platinum and palladium with certain concentration still remains in the solution after the platinum and palladium are precipitated for the first time and the second time, so that the loss of the platinum and palladium is caused, and the product requirement is difficult to achieve.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provide the method for efficiently separating the platinum and the palladium from the gold extraction residual liquid, which has high platinum and palladium separation rate, can shorten the later-stage refining and purifying process and reduce the cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for efficiently separating platinum and palladium from raffinate is characterized by comprising the following steps:
(1) mixing sodium bisulfite and the gold extraction residual liquid to obtain a mixed feed liquid, wherein the solid-liquid mass ratio of the sodium bisulfite to the gold extraction residual liquid is 1: 1.5;
(2) adjusting the acidity of the mixed feed liquid to 1-1.5 mol/L; adjusting the temperature of the mixed material liquid to 70-80 ℃;
(3) and (3) controlling the end point potential of the mixed material liquid after the acidity and the temperature are adjusted in the step (2) to be 350 mv-420 mv, and obtaining the platinum and the palladium separated from the gold extraction residual liquid.
The method for efficiently separating the platinum and the palladium from the gold extraction residual liquid is characterized in that the end point potential of the mixed feed liquid is controlled to be 350 mv-420 mv by introducing chlorine gas in the step (3).
The method for efficiently separating platinum and palladium from the gold raffinate is characterized in that the concentration of platinum separated from the gold raffinate in the step (3) is less than 0.05 g/L; the concentration of palladium separated from the gold extraction raffinate in the step (3) is less than 0.05 g/L.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, a sodium bisulfite reagent is adopted to reduce Pt, Pd, Ru, Ir, Te and Se in the gold extraction residual liquid, the temperature and acidity of the solution are controlled, the end point potential is controlled to efficiently separate the platinum and the palladium in the gold extraction residual liquid, the recovery rate of the platinum and the palladium is improved, the content of other impurity metals is reduced, the grade of the obtained platinum and the palladium is relatively pure, the subsequent precious metal refining process is shortened, the refining cost is saved, the concentration of the platinum and the palladium in the reduced liquid can reach below 0.05g/L after the reduction of the sodium bisulfite and the control of the temperature, the acidity and the end point potential of the solution, compared with the existing platinum and palladium reduction process, the platinum and palladium separation effect is greatly improved, the environmental protection problem of waste liquid in the platinum and palladium refining process is solved, and the invention can be applied to the high-efficiency separation and purification process of the platinum and the palladium in the gold extraction.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
Referring to fig. 1, the method for efficiently separating platinum and palladium from raffinate of gold comprises the following steps: (1) mixing sodium bisulfite and the gold extraction residual liquid to obtain a mixed feed liquid, wherein the solid-liquid mass ratio of the sodium bisulfite to the gold extraction residual liquid is 1: 1.5; sodium bisulfite is used as a reducing agent, so that the reduction effect is good, the efficiency is high, the operability is strong, and the platinum and palladium in the solution can be further efficiently reduced. (2) Adjusting the acidity of the mixed feed liquid to 1-1.5 mol/L; the temperature of the mixed material liquid is adjusted to 70-80 ℃. (3) And (3) controlling the end point potential of the mixed material liquid after the acidity and the temperature are adjusted in the step (2) to be 350 mv-420 mv, and obtaining the platinum and the palladium separated from the gold extraction residual liquid. The end point potential of the mixed material liquid is controlled to be 350 mv-420 mv by introducing chlorine. The concentration of platinum separated from the gold extraction residual liquid is less than 0.05 g/L; the concentration of palladium separated from the gold extraction raffinate in the step (3) is less than 0.05 g/L.
The present invention will be further described with reference to the following specific examples.
Example 1
The concentration of Ag in the gold extraction residual liquid generated by electrolytic refining of a silver anode plate is 0.6g/L, the concentration of Pd is 0.07g/L, the concentration of Pt is 0.004g/L, the concentration of Au is 0.005g/L, the output of the liquid in each electrolytic period is about 800L, sodium bisulfite is added into the gold extraction residual liquid according to the amount which is 1.5 times of the theoretical coefficient, the acidity of the solution is controlled to be 1.5mol/L by adding acid and alkali liquor, and Cl is introduced2The end point potential of the solution is controlled to be 350 mv-420 mv, the platinum and the palladium in the gold extraction residual liquid are efficiently separated, and the concentration of the platinum and the palladium separated from the gold extraction residual liquid is below 0.05g/L after sampling, assay and analysis. The separated platinum and palladium reaches the product standard after purification and refining.
Example 2
The concentration of Ag in the gold extraction residual liquid generated in the silver anode mud wet refining gold extraction process is 0.6g/L, the concentration of Pd is 0.07g/L, the concentration of Pt is 0.004g/L, the concentration of Au is 0.005g/L, the output of the liquid in each electrolysis period is 800L, sodium bisulfite is added into the gold extraction residual liquid according to the amount which is 1.5 times of the theoretical coefficient, the acidity of the solution is controlled to be 1.5mol/L by adding acid and alkali liquor, and Cl is introduced2Controlling the end point potential of the solution between 350mv and 420mv, efficiently separating out the platinum and the palladium in the gold extraction residual liquid, and after sampling, testing and analyzing, the concentration of the platinum and the palladium separated out from the gold extraction residual liquid is below 0.05 g/L. The separated platinum and palladium reaches the product standard after purification and refining.
Example 3
The Ag concentration in the gold extraction residual liquid produced by the platinum group metal purification process is 0.6g/L, the Pd concentration is 0.07g/L, the Pt concentration is 0.004g/L, the Au concentration is 0.005g/L, the output of the liquid in each electrolysis period is 800L, sodium bisulfite is added into the gold extraction residual liquid according to the amount which is 1.5 times of the theoretical coefficient, the acidity of the solution is controlled to be 1.5mol/L by adding acid and alkali liquor, and Cl is introduced2Controlling the end point potential of the solution between 350mv and 420mv, efficiently separating out the platinum and the palladium in the gold extraction residual liquid, and after sampling, testing and analyzing, the concentration of the platinum and the palladium separated out from the gold extraction residual liquid is below 0.05 g/L. The separated platinum and palladium reaches the product standard after purification and refining。
Claims (3)
1. A method for efficiently separating platinum and palladium from raffinate is characterized by comprising the following steps:
(1) mixing sodium bisulfite and the gold extraction residual liquid to obtain a mixed feed liquid, wherein the solid-liquid mass ratio of the sodium bisulfite to the gold extraction residual liquid is 1: 1.5;
(2) adjusting the acidity of the mixed feed liquid to 1-1.5 mol/L; adjusting the temperature of the mixed material liquid to 70-80 ℃;
(3) and (3) controlling the end point potential of the mixed material liquid after the acidity and the temperature are adjusted in the step (2) to be 350 mv-420 mv, and obtaining the platinum and the palladium separated from the gold extraction residual liquid.
2. The method for efficiently separating platinum and palladium from raffinate as claimed in claim 1, wherein the end point potential of the mixed feed liquid in step (3) is controlled to be 350 mv-420 mv by introducing chlorine gas.
3. The method for efficiently separating platinum and palladium from raffinate as claimed in claim 1, wherein the concentration of platinum separated from raffinate in step (3) is less than 0.05 g/L; the concentration of palladium separated from the gold extraction raffinate in the step (3) is less than 0.05 g/L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011327936.7A CN112442599A (en) | 2020-11-24 | 2020-11-24 | Method for efficiently separating platinum and palladium from gold extraction residual liquid |
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| CN202011327936.7A CN112442599A (en) | 2020-11-24 | 2020-11-24 | Method for efficiently separating platinum and palladium from gold extraction residual liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418490A (en) * | 2022-09-16 | 2022-12-02 | 贵研资源（易门）有限公司 | Method for recovering platinum and palladium from waste liquid containing trace precious metals |
Citations (5)
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|---|---|---|---|---|
| RU2441929C1 (en) * | 2010-12-07 | 2012-02-10 | Учреждение Российской академии наук Институт химии и химической технологии Сибирского отделения РАН (ИХХТ СО РАН) | Extraction of gold, palladium and platinum from chloride solution |
| CN105256139A (en) * | 2015-11-18 | 2016-01-20 | 金川集团股份有限公司 | Method for reducing gold extraction residual liquid |
| CN105441693A (en) * | 2015-11-18 | 2016-03-30 | 金川集团股份有限公司 | Method for separating and extracting platinum group metals |
| CN105779766A (en) * | 2016-03-23 | 2016-07-20 | 江西铜业集团公司 | Method for gathering platinum and palladium in solution |
| CN106119554A (en) * | 2016-08-18 | 2016-11-16 | 紫金矿业集团股份有限公司 | High Purity Gold the method being enriched with silver, platinum and palladium is prepared from silver anode slime |
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- 2020-11-24 CN CN202011327936.7A patent/CN112442599A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2441929C1 (en) * | 2010-12-07 | 2012-02-10 | Учреждение Российской академии наук Институт химии и химической технологии Сибирского отделения РАН (ИХХТ СО РАН) | Extraction of gold, palladium and platinum from chloride solution |
| CN105256139A (en) * | 2015-11-18 | 2016-01-20 | 金川集团股份有限公司 | Method for reducing gold extraction residual liquid |
| CN105441693A (en) * | 2015-11-18 | 2016-03-30 | 金川集团股份有限公司 | Method for separating and extracting platinum group metals |
| CN105779766A (en) * | 2016-03-23 | 2016-07-20 | 江西铜业集团公司 | Method for gathering platinum and palladium in solution |
| CN106119554A (en) * | 2016-08-18 | 2016-11-16 | 紫金矿业集团股份有限公司 | High Purity Gold the method being enriched with silver, platinum and palladium is prepared from silver anode slime |
Non-Patent Citations (3)
| Title |
|---|
| JAE-CHUN LEE等: "Separation of platinum, palladium and rhodium from aqueous solutions using ion exchange resin: A review", 《SEPARATION AND PURIFICATION TECHNOLOGY》 * |
| 曲胜利等: "《黄金冶金新技术》", 31 July 2018 * |
| 贾建华: "铂钯泥中金属提取工艺优化的研究", 《中国有色冶金》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418490A (en) * | 2022-09-16 | 2022-12-02 | 贵研资源（易门）有限公司 | Method for recovering platinum and palladium from waste liquid containing trace precious metals |
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