CN114769580A - Method for removing impurity silver from reduced gold powder - Google Patents
Method for removing impurity silver from reduced gold powder Download PDFInfo
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- CN114769580A CN114769580A CN202210226332.6A CN202210226332A CN114769580A CN 114769580 A CN114769580 A CN 114769580A CN 202210226332 A CN202210226332 A CN 202210226332A CN 114769580 A CN114769580 A CN 114769580A
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Abstract
The invention provides a method for removing impurity silver from reduced gold powder, which comprises the following steps of primary digestion, washing, secondary digestion and drying. The independently prepared A, B boiling and washing liquid is added to the reduced gold powder with higher silver content step by step to remove the impurity silver, so that the purification of crude gold powder is realized, the problems of gold product fluctuation or gold powder rework and the like caused by trace silver impurities are solved, the gold direct yield is improved, the rework cost is reduced, the production and operation indexes in the gold smelting process are comprehensively improved, and the method can be applied to a precious metal purification process and a precious metal separation process.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a method for removing impurity silver from reduced gold powder.
Background
Gold and silver are associated with each other in precious metal mineral resources, gold, silver and other precious metals in the mineral resources are usually recovered from smelting tailings such as nickel, copper, lead and the like, the currently common gold smelting method is a process of chlorination dissolution, extraction, reduction or chlorination dissolution, selective reduction and the like, the silver and the gold are separated in the chlorination dissolution process, silver and chloride ions can generate silver chloride precipitates through chlorination reaction, because the gold aqueous solution needs to reach an oxidation potential of more than 1000mv for chlorination, high-concentration [ Cl ] generated by chlorination reaction and silver chloride generate complex reaction to generate silver dichloride complex ions and (AgCl) 2-, the silver dichloride complex ions are generated in the reduction process of the chlorination solution, the silver content in the gold product exceeds the quality standard requirement because the silver is very easy to be reduced into simple substance silver or silver chloride to be doped in the gold powder, and the original production process mainly adopts the following method to remove impurities and purify the gold powder with high silver content: 1. the silver is not completely removed by adopting a boiling and washing method of reagents such as hydrochloric acid, nitric acid and the like, and the problems of large gold loss and the like exist; 2. the gold powder is reworked, dissolved and reduced for more than 1 time, the gold production cost is high, and the yield is low. The above problems all result in low utilization rate of gold resources, so that high-efficiency purification work needs to be carried out aiming at the impurity element silver in the high silver-containing gold powder, and the comprehensive utilization level of the gold resources is effectively improved.
Disclosure of Invention
The invention aims to provide a method for removing impurity silver from reduced gold powder aiming at the problems in the prior art.
Therefore, the invention adopts the following technical scheme:
a method for removing impurity silver from reduced gold powder comprises the following steps:
(1) primary soaking, namely adding the soaking liquid A into the gold powder, heating to 58-90 ℃, and keeping the temperature for 3-5 hours, wherein the mass ratio of the soaking liquid A to the gold powder is 4-6: 1;
(2) washing, namely filtering out a digestion solution in the gold powder, and washing the crude gold powder to be neutral, wherein the mass ratio of the washing solution to the gold powder is 4-7: 1;
(3) secondary digestion, namely adding the digestion solution B into the gold powder, heating to 30-40 ℃, and preserving heat for 5-7 hours;
(4) and (4) drying, namely filtering the washing liquid in the gold powder and drying.
Further, the digestion solution in the step (1) is a mixed solution prepared by ammonia water and nitric acid according to a ratio of 1: 3.
Further, in the step (1), the digestion solution is stirred in the heating and heat preservation processes.
Further, the digestion solution B in the step (3) is a mixed solution prepared by ammonia water and water according to a ratio of 1: 1.
Further, the washing liquid is stirred in the heating and heat preservation processes in the step (3).
The invention has the beneficial effects that:
(1) the A, B boiling and washing liquid which is automatically configured is added into the reduced gold powder with higher silver content step by step to remove the impurity silver in the reduced gold powder, so that the purification of the crude gold powder is realized, the problems of gold product fluctuation or gold powder rework and the like caused by trace silver impurities are solved, the gold direct yield is improved, the rework cost is reduced, the production and operation indexes in the gold smelting process are comprehensively improved, and the method can be applied to a noble metal purification process and a noble metal separation process.
(2) The operation is simple and convenient, and the volume of the boiling washing liquid and the boiling washing period can be adjusted according to the silver content in the crude gold powder.
Detailed Description
The present invention is described in detail below with reference to examples:
example 1
67.6422kg of gold powder is selected, the selected gold powder is produced by selectively reducing gold, platinum and palladium chloride solution by sodium bisulfite, the silver content is 0.023%, and the total grade of the gold powder is 99.968%.
(1) The gold powder is put into an enamel evaporating pot and slowly added into a digestion solution A prepared by ammonia water and nitric acid according to a ratio of 1:3, 207L of the digestion solution A is prepared in the embodiment, the total mass of the digestion solution A is 264kg, the mass ratio of the digestion solution A to the gold powder is 3.9:1, the chloric complex silver is converted into silver chloride, after the reaction in the enamel evaporating pot is stable, steam is started for heating, the temperature is kept for 3 hours after the temperature in the enamel evaporating pot is raised to 87 ℃, the gold powder is stirred every 20 minutes during the heat preservation, each stirring is carried out for 15 minutes, partial water can be evaporated during the heating, and the heating and the stirring can enable the reaction to be fully carried out.
(2) And (3) washing, namely filtering out the digestion liquid in the gold powder, washing the gold powder with clear water, and removing the acidic digestion liquid in the gold powder to make the gold powder neutral.
(3) And (2) performing secondary soaking, namely slowly adding a soaking solution B prepared by ammonia water and water according to a ratio of 1:1 into the enamel evaporating pot to mix with the gold powder, wherein 340L of the soaking solution B is prepared in the embodiment, the total mass of the soaking solution B is 342kg, the mass ratio of the soaking solution B to the gold powder is 4.8:1, the silver chloride in the gold powder is sufficiently removed by the soaking solution B, after the soaking solution B is sufficiently mixed, starting steam for heating, keeping the temperature for 5 hours after the temperature in the enamel evaporating pot is raised to 35 ℃, stirring the gold powder every 30 minutes in the heat preservation process, stirring for 15 minutes every time, and heating and stirring to ensure that the reaction is sufficiently performed.
(4) And drying, namely filtering out washing liquid in the gold powder, washing off alkaline solution on the surface of the gold powder to make the gold powder neutral, and finally drying to obtain the gold powder after impurity removal.
Detection shows that the silver content in the gold powder after impurity removal is reduced to 0.0008%, and the total grade of the gold powder reaches 99.99%.
Example 2
11.24kg of gold powder is selected, the selected gold powder is gold powder produced by oxalic acid reduction in the platinum group metal refining process, the silver content is 0.047%, and the total grade of the gold powder is 99.945%.
(1) The method comprises the steps of one-time boiling, adding gold powder into a boiling solution, placing the boiling solution into an enamel evaporating pot, slowly adding a boiling solution prepared by ammonia water and nitric acid according to the ratio of 1:3, preparing 50L of the boiling solution A in the embodiment, wherein the mass of the boiling solution A is 64kg, the mass ratio of the boiling solution A to the gold powder is 5.8:1, converting silver chloride into silver chloride, starting steam for heating after the reaction in the enamel evaporating pot is stable, keeping the temperature for 3 hours after the temperature in the enamel evaporating pot is raised to 90 ℃, stirring the gold powder every 20 minutes in the heat preservation process, and stirring for 15 minutes each time, wherein the heating and stirring can fully react.
(2) Washing, filtering out the digestion solution in the gold powder, washing the crude gold powder to be neutral, and removing the digestion solution.
(3) And (2) carrying out secondary soaking, namely slowly adding a washing liquid prepared from ammonia water and water according to a ratio of 1:1 into an enamel evaporating pot to mix with the gold powder, wherein 62L of a soaking liquid B is prepared in the embodiment, the total mass of the soaking liquid B is 59kg, the mass ratio of the soaking liquid B to the gold powder is 5.3:1, the soaking liquid B fully removes silver chloride in the gold powder, after the mixing is fully carried out, starting steam for heating, keeping the temperature for 5 hours after the temperature in the enamel evaporating pot is raised to 40 ℃, stirring the gold powder every 15 minutes in the heat preservation process, and stirring for 5 minutes every time, wherein the heating and stirring can fully carry out the reaction.
(4) And (4) drying, filtering out the washing liquid in the gold powder after heat preservation, washing the crude gold powder to be neutral, and finally drying to obtain the gold powder after impurity removal.
The content of silver in the gold powder after impurity removal is reduced to 0.0005% through detection, and the total grade of the gold powder reaches 99.99%.
Example 3
36.78kg of gold powder is selected, the selected gold powder is a gold-silver alloy, after being dissolved by aqua regia, sodium bisulfite is adopted to reduce the solution to obtain the organic gold powder, the silver content is 0.055%, and the total grade of the gold powder is 99.936%.
(1) And (2) carrying out primary soaking, namely adding gold powder into the soaking liquid, putting the gold powder into an enamel evaporating pot, slowly adding a soaking liquid prepared by ammonia water and nitric acid according to a ratio of 1:3, wherein 165L of the soaking liquid A is prepared in the embodiment, the mass of the soaking liquid A is 211kg, and the mass ratio of the soaking liquid A to the gold powder is 5.7:1, so that chloric complex silver is converted into silver chloride, starting steam for heating after the reaction in the enamel evaporating pot is stable, keeping the temperature for 3 hours after the temperature in the enamel evaporating pot is raised to 85 ℃, stirring the gold powder every 15 minutes during heat preservation, and stirring for 10 minutes every time.
(2) And (4) washing, namely filtering out the digestion solution in the gold powder, washing the crude gold powder to be neutral, and removing the digestion solution.
(3) And (2) carrying out secondary soaking, namely slowly adding a washing liquid prepared by ammonia water and water according to a ratio of 1:1 into the enamel evaporating pot to mix with the gold powder, wherein 220L of a soaking liquid B is prepared in the embodiment, the mass of the soaking liquid B is 210kg, the mass ratio of the soaking liquid B to the gold powder is 5.7:1, the soaking liquid B fully removes silver chloride in the gold powder, after the soaking liquid B is fully mixed, starting steam for heating, keeping the temperature for 5 hours after the temperature in the enamel evaporating pot is raised to 38 ℃, stirring the gold powder every 20 minutes during the heat preservation, and stirring for 10 minutes every time.
(4) And (4) drying, filtering out the washing liquid in the gold powder after heat preservation, washing the crude gold powder to be neutral, and finally drying to obtain the gold powder after impurity removal.
The content of silver in the gold powder after impurity removal is reduced to 0.0001 percent through detection, and the total grade of the gold powder reaches 99.99 percent.
Claims (5)
1. A method for removing impurity silver in reduced gold powder is characterized by comprising the following steps:
(1) primary soaking, namely adding the soaking liquid A into the gold powder, heating to 58-90 ℃, and preserving heat for 3-5 hours, wherein the mass ratio of the soaking liquid A to the gold powder is 4-6: 1;
(2) washing, namely filtering out the digestion solution in the gold powder, and washing the crude gold powder to be neutral;
(3) secondary digestion, namely adding the digestion solution B into the gold powder, heating to 30-40 ℃, and preserving heat for 5-7 hours, wherein the mass ratio of the washing solution to the gold powder is 4-7: 1;
(4) and (4) drying, namely filtering the washing liquid in the gold powder and drying.
2. The method for removing impurity silver from reduced gold powder according to claim 1, wherein the digestion solution A in the step (1) is a mixed solution of ammonia water and nitric acid in a ratio of 1: 3.
3. The method for removing silver impurities from reduced gold powder according to claim 1, wherein the step (1) is carried out by stirring the digestion solution during the heat preservation.
4. The method for removing impurity silver from reduced gold powder according to claim 1, wherein the digestion solution B in step (3) is a mixed solution of ammonia water and water in a ratio of 1: 1.
5. The method for removing silver impurities from reduced gold powder according to claim 1, wherein the washing solution is stirred during the heat preservation in the step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210226332.6A CN114769580A (en) | 2022-03-09 | 2022-03-09 | Method for removing impurity silver from reduced gold powder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210226332.6A CN114769580A (en) | 2022-03-09 | 2022-03-09 | Method for removing impurity silver from reduced gold powder |
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| CN114769580A true CN114769580A (en) | 2022-07-22 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362532A (en) * | 2001-01-08 | 2002-08-07 | 冶金工业部长春黄金研究院 | Amminochloride process of purifying gold |
| CN103233132A (en) * | 2013-04-22 | 2013-08-07 | 金川集团股份有限公司 | Method for removing impurities from gold powder |
| CN105441689A (en) * | 2015-11-18 | 2016-03-30 | 金川集团股份有限公司 | Method for preparing high-purity gold |
| CN107460337A (en) * | 2017-08-23 | 2017-12-12 | 中南大学 | A kind of method that rich and honour antimony control current potential is enriched with and prepares four or nine gold medals |
| CN111363920A (en) * | 2020-04-07 | 2020-07-03 | 金川集团股份有限公司 | Method for extracting gold from silver-containing liquid |
| CN113528850A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Method for purifying gold by controlling potential |
-
2022
- 2022-03-09 CN CN202210226332.6A patent/CN114769580A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362532A (en) * | 2001-01-08 | 2002-08-07 | 冶金工业部长春黄金研究院 | Amminochloride process of purifying gold |
| CN103233132A (en) * | 2013-04-22 | 2013-08-07 | 金川集团股份有限公司 | Method for removing impurities from gold powder |
| CN105441689A (en) * | 2015-11-18 | 2016-03-30 | 金川集团股份有限公司 | Method for preparing high-purity gold |
| CN107460337A (en) * | 2017-08-23 | 2017-12-12 | 中南大学 | A kind of method that rich and honour antimony control current potential is enriched with and prepares four or nine gold medals |
| CN111363920A (en) * | 2020-04-07 | 2020-07-03 | 金川集团股份有限公司 | Method for extracting gold from silver-containing liquid |
| CN113528850A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Method for purifying gold by controlling potential |
Non-Patent Citations (1)
| Title |
|---|
| 卢建丰;: "王水分金渣氨水浸出回收金银试验研究", 黄金, no. 01, pages 64 - 66 * |
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