CN114277257A - Method for recovering gold from gold-containing waste liquid - Google Patents
Method for recovering gold from gold-containing waste liquid Download PDFInfo
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- CN114277257A CN114277257A CN202111438911.9A CN202111438911A CN114277257A CN 114277257 A CN114277257 A CN 114277257A CN 202111438911 A CN202111438911 A CN 202111438911A CN 114277257 A CN114277257 A CN 114277257A
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Abstract
The invention relates to the technical field of precious metal recovery, and relates to a method for recovering gold from gold-containing waste liquid. The invention replaces gold in the gold-containing waste liquid by the iron powder to complete the pretreatment of gold recovery, has simple operation, greatly improves the leaching rate of gold and is more beneficial to further recovery of gold; after the gold slag is added into the hydrochloric acid solution to remove iron, the hydrochloric acid solution is added to ensure complete iron removal and improve the purity of the gold slag; after the gold slag is dissolved by aqua regia, hydrochloric acid is added to remove the residue of the dissolved liquid, so that the impurity residue rate is reduced; the recovery method can fully recycle the gold of the gold-containing waste liquid, has advanced process, high recovery rate and convenient operation, effectively reduces the production cost, has high purity of the recovered finished gold, and is suitable for industrial large-scale production.
Description
Technical Field
The invention relates to the technical field of precious metal recovery, and relates to a method for recovering gold from gold-containing waste liquid.
Background
Gold is a precious metal element, is international universal currency, is widely applied to industrial production departments such as aviation, aerospace, various precision instrument manufacturing and the like, and the gold consumption required by industrial production and jewelry processing is increased year by year along with the rapid development of national economy of China and the continuous improvement of living standard of people at present, but because the geological storage of gold is limited, gold produced by ore needs to go through a plurality of complex procedures, and a large amount of manpower, material resources and financial resources are consumed to regenerate and recover gold from gold-containing waste.
At present, the method of reduced pressure distillation and waste liquor concentration is generally adopted in the treatment plant of the gold-containing waste liquor. However, the method needs to consume more electric power for heating, not only has higher requirement on a recovered container, but also generates a large amount of harmful gas to influence the environment, and has the defects of complicated subsequent gold recovery procedures, high requirement on process conditions and low gold recovery rate, and the prior art does not have a process capable of effectively recovering gold from the gold-containing waste liquid.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for recovering gold from the gold-containing waste liquid, which can fully recover and utilize the gold from the gold-containing waste liquid, has advanced process, high recovery rate and convenient operation and is suitable for industrial large-scale production.
In order to solve the technical problems, the technical scheme adopted by the invention for solving the technical problems is as follows:
a method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, and adding the iron powder while stirring until the gold is completely replaced:
b. filtering and washing the replaced gold tail liquid to obtain gold slag;
c. and (3) adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag:
d. adding the gold slag subjected to iron removal into a reaction kettle, adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, and obtaining the aqua regia after denitration is completed;
e. filtering and washing the dissolved gold aqua regia;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia until gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder;
h. and smelting the dried gold powder to obtain gold blocks.
Further, in the step a, the gold-containing waste liquor is an alkaline solution with the pH value of 11-13.
Further, in the step a, the gold-containing waste liquid in the reaction kettle is heated to 35-50 ℃ until gold is completely replaced, the heating is stopped, and the replaced gold tail liquid is kept stand for 1-4h to room temperature.
Further, in the step a, when the iron powder is added to replace gold, the addition amount of the iron powder is 4-6 times of the weight of each kilogram of gold.
Further, in the step b, the gold tail solution after replacement is filtered and washed until the pH value of the filtrate is neutral.
Further, in the step c, the filtered gold slag is slowly added into a hydrochloric acid solution, and after the gold slag is completely added into the hydrochloric acid solution, 0.3-1L of hydrochloric acid solution is added until the gold slag in the hydrochloric acid solution does not react any more.
Further, in the step d, after the gold slag subjected to iron removal is dissolved in aqua regia at the temperature of 30-50 ℃ for 1-4h, heating is continuously carried out in the denitration process until denitration is completed, heating is stopped, and the gold aqua regia is obtained after dissolution is completed.
Further, in the step d, the mass ratio of the gold slag to the aqua regia is 1: 2-4.
Further, in step f, when anhydrous sodium sulfite is added to reduce gold, the amount of the anhydrous sodium sulfite added is 1/5 to 3/5 per kg of the weight of the gold nuggets.
Further, in the step g, the drying temperature of the gold powder is 100-.
The invention has the beneficial effects that:
the invention replaces gold in the gold-containing waste liquid by the iron powder to complete the pretreatment of gold recovery, has simple operation, greatly improves the leaching rate of gold and is more beneficial to further recovery of gold; after the gold slag is added into the hydrochloric acid solution to remove iron, the hydrochloric acid solution is added to ensure complete iron removal and improve the purity of the gold slag; after the gold slag is dissolved by aqua regia, hydrochloric acid is added to remove the residue of the dissolved liquid, so that the impurity residue rate is reduced; the recovery method can fully recycle the gold of the gold-containing waste liquid, has advanced process, high recovery rate and convenient operation, effectively reduces the production cost, has high purity of the recovered finished gold, and is suitable for industrial large-scale production.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the examples are not intended to limit the present invention.
Example 1
A method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, wherein the gold-containing waste liquid is an alkaline solution with the pH value of 11, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, the adding amount of the iron powder is 4 times of the weight of each kilogram of gold, namely, 4kg of iron powder is needed for 1kg of gold, heating the gold-containing waste liquid in the reaction kettle to 45 ℃, adding the iron powder while stirring, stopping heating until the gold is completely replaced, and standing the replaced gold tail liquid for 3h to room temperature:
b. filtering and washing the gold tail liquid after replacement to obtain gold slag, wherein the pH value of filtrate obtained by filtering and washing is neutral;
c. slowly adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag, adding 0.3L of hydrochloric acid solution into the gold slag after the gold slag is completely added into the hydrochloric acid solution until the gold slag in the hydrochloric acid solution does not react any more, and finishing the iron removal process:
d. adding the gold slag subjected to iron removal into a reaction kettle, then adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, wherein the mass ratio of the gold slag to the aqua regia is 1: 2.5, dissolving at the temperature of 35 ℃ for 3 hours, slowly adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, continuously heating in the pin removing process until denitration is finished, stopping heating, and dissolving to obtain gold aqua regia;
e. vacuum filtering and washing the dissolved gold aqua regia until the pH value of the filtrate is neutral;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia, wherein the addition amount of the anhydrous sodium sulfite is 1kg of gold, and 375g of anhydrous sodium sulfite is needed, until the gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder at the drying temperature of 100 ℃ for 6 h;
h. and smelting the dried gold powder to obtain gold blocks, adding borax in the smelting process, wherein the smelting temperature is 1000 ℃, the smelting time is 70min, and obtaining the gold blocks after the smelting is finished.
The invention replaces gold in the gold-containing waste liquid by the iron powder to complete the pretreatment of gold recovery, has simple operation, greatly improves the leaching rate of gold and is more beneficial to further recovery of gold; after the gold slag is added into the hydrochloric acid solution to remove iron, the hydrochloric acid solution is added to ensure complete iron removal, improve the purity of the gold slag and avoid the influence of iron powder on the recovery rate of gold; after gold slag is dissolved by aqua regia, hydrochloric acid is added to remove the pin of the dissolved liquid, and the undissolved waste gold-containing waste liquid solid is removed by vacuum filtration and washing, so that the impurity residue rate is reduced; adding gold powder in reduced gold aqua regia containing anhydrous sodium sulfite, and vacuum filtering and washing to remove liquid containing impurity metal elements (such as gold, silver, copper and the like in the gold aqua regia) to ensure the purity of the gold powder; the gold powder is dried, so that the solution can be dried to thoroughly remove impurity metals, and the purity of the gold powder is ensured; the recovery method can fully recycle the gold from the gold-containing waste liquid, has advanced process, high recovery rate and convenient operation, effectively reduces the production cost, has high purity of the recovered finished gold, and is suitable for industrial large-scale production.
Example 2
A method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, wherein the gold-containing waste liquid is an alkaline solution with the pH value of 12, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, the adding amount of the iron powder is 4.5 times of the weight of each kilogram of gold, namely, 4.5kg of iron powder is needed for 1kg of gold, heating the gold-containing waste liquid in the reaction kettle to 50 ℃, adding the iron powder while stirring until the gold is completely replaced, stopping heating until the gold is completely replaced, and standing the replaced gold tail liquid for 4h to room temperature:
b. filtering and washing the gold tail liquid after replacement to obtain gold slag, wherein the pH value of filtrate obtained by filtering and washing is neutral;
c. slowly adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag, adding 0.4L of hydrochloric acid solution into the gold slag after the gold slag is completely added into the hydrochloric acid solution until the gold slag in the hydrochloric acid solution does not react any more, and finishing the iron removal process:
d. adding the gold slag subjected to iron removal into a reaction kettle, then adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, wherein the mass ratio of the gold slag to the aqua regia is 1: 4, dissolving at the temperature of 45 ℃ for 1.5h, then slowly adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, continuously heating in the pin removing process until denitration is finished, stopping heating, and obtaining gold aqua regia after dissolution is finished;
e. vacuum filtering and washing the dissolved gold aqua regia until the pH value of the filtrate is neutral;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia, wherein the addition amount of the anhydrous sodium sulfite is 1kg of gold, and 425g of anhydrous sodium sulfite is needed until the gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder at the drying temperature of 110 ℃ for 5 h;
h. and smelting the dried gold powder to obtain gold blocks, adding borax in the smelting process, wherein the smelting temperature is 1050 ℃, the smelting time is 65min, and obtaining the gold blocks after the smelting is finished.
Example 3
A method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, wherein the gold-containing waste liquid is an alkaline solution with the pH value of 13, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, the adding amount of the iron powder is 5 times of the weight of each kilogram of gold, namely, 5kg of iron powder is needed for 1kg of gold, heating the gold-containing waste liquid in the reaction kettle to 40 ℃, adding the iron powder while stirring, stopping heating until the gold is completely replaced, and standing the replaced gold tail liquid for 2h to room temperature:
b. filtering and washing the gold tail liquid after replacement to obtain gold slag, wherein the pH value of filtrate obtained by filtering and washing is neutral;
c. slowly adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag, adding 0.5L of hydrochloric acid solution into the gold slag after the gold slag is completely added into the hydrochloric acid solution until the gold slag in the hydrochloric acid solution does not react any more, and finishing the iron removal process:
d. adding the gold slag subjected to iron removal into a reaction kettle, then adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, wherein the mass ratio of the gold slag to the aqua regia is 1: 3, dissolving at the temperature of 40 ℃ for 2 hours, slowly adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, continuously heating in the pin removing process until denitration is finished, stopping heating, and dissolving to obtain gold aqua regia;
e. vacuum filtering and washing the dissolved gold aqua regia until the pH value of the filtrate is neutral;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia, wherein the addition amount of the anhydrous sodium sulfite is 400g of anhydrous sodium sulfite required for 1kg of gold until the gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder at the drying temperature of 120 ℃ for 4 h;
h. and smelting the dried gold powder to obtain gold blocks, adding borax in the smelting process, wherein the smelting temperature is 1100 ℃, the smelting time is 60min, and obtaining the gold blocks after the smelting is finished.
Example 4
A method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, wherein the gold-containing waste liquid is an alkaline solution with the pH value of 12, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, the adding amount of the iron powder is 5.5 times of the weight of each kilogram of gold, namely, 5.5kg of iron powder is needed for 1kg of gold, heating the gold-containing waste liquid in the reaction kettle to 35 ℃, adding the iron powder while stirring until the gold is completely replaced, stopping heating until the gold is completely replaced, and standing the replaced gold tail liquid for 1h to the room temperature:
b. filtering and washing the gold tail liquid after replacement to obtain gold slag, wherein the pH value of filtrate obtained by filtering and washing is neutral;
c. slowly adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag, adding 0.65L of hydrochloric acid solution into the gold slag after the gold slag is completely added into the hydrochloric acid solution until the gold slag in the hydrochloric acid solution does not react any more, and finishing the iron removal process:
d. adding the gold slag subjected to iron removal into a reaction kettle, then adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, wherein the mass ratio of the gold slag to the aqua regia is 1: 2.5, dissolving at the temperature of 35 ℃ for 3 hours, slowly adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, continuously heating in the pin removing process until denitration is finished, stopping heating, and dissolving to obtain gold aqua regia;
e. vacuum filtering and washing the dissolved gold aqua regia until the pH value of the filtrate is neutral;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia, wherein the addition amount of the anhydrous sodium sulfite is 1kg of gold, and 385g of anhydrous sodium sulfite is needed, until the gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder at the drying temperature of 130 ℃ for 3.5 h;
h. and smelting the dried gold powder to obtain gold blocks, adding borax in the smelting process, wherein the smelting temperature is 1150 ℃, the smelting time is 55min, and obtaining the gold blocks after the smelting is finished.
Example 5
A method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, wherein the gold-containing waste liquid is an alkaline solution with the pH value of 13, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, the adding amount of the iron powder is 6 times of the weight of each kilogram of gold, namely, 6kg of iron powder is needed for 1kg of gold, heating the gold-containing waste liquid in the reaction kettle to 50 ℃, adding the iron powder while stirring, stopping heating until the gold is completely replaced, and standing the replaced gold tail liquid for 3.5h to room temperature:
b. filtering and washing the gold tail liquid after replacement to obtain gold slag, wherein the pH value of filtrate obtained by filtering and washing is neutral;
c. slowly adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag, adding 0.0.8L of hydrochloric acid solution into the gold slag after the gold slag is completely added into the hydrochloric acid solution until the gold slag in the hydrochloric acid solution does not react any more, and finishing the iron removal process:
d. adding the gold slag subjected to iron removal into a reaction kettle, then adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, wherein the mass ratio of the gold slag to the aqua regia is 1: 4, dissolving at the temperature of 45 ℃ for 3.5h, then slowly adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, continuously heating in the pin removing process until denitration is finished, stopping heating, and obtaining gold aqua regia after dissolution is finished;
e. vacuum filtering and washing the dissolved gold aqua regia until the pH value of the filtrate is neutral;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia, wherein the addition amount of the anhydrous sodium sulfite is 1kg of gold, and 450g of the anhydrous sodium sulfite is needed, until the gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder at 135 ℃ for 5.5 hours;
h. and smelting the dried gold powder to obtain gold blocks, adding borax in the smelting process, wherein the smelting temperature is 1250 ℃, the smelting time is 50min, and obtaining the gold blocks after the smelting is finished.
Example 6
A method for recovering gold from gold-containing waste liquid comprises the following steps:
a. putting the gold-containing waste liquid into a reaction kettle, wherein the gold-containing waste liquid is an alkaline solution with the pH value of 1, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, the adding amount of the iron powder is 6 times of the weight of each kilogram of gold, namely, 6kg of iron powder is needed for 1kg of gold, heating the gold-containing waste liquid in the reaction kettle to 50 ℃, adding the iron powder while stirring, stopping heating until the gold is completely replaced, and standing the replaced gold tail liquid for 4h to room temperature:
b. filtering and washing the gold tail liquid after replacement to obtain gold slag, wherein the pH value of filtrate obtained by filtering and washing is neutral;
c. slowly adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag, adding 1L of hydrochloric acid solution into the gold slag after the gold slag is completely added into the hydrochloric acid solution until the gold slag in the hydrochloric acid solution does not react any more, and finishing the iron removal process:
d. adding the gold slag subjected to iron removal into a reaction kettle, then adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, wherein the mass ratio of the gold slag to the aqua regia is 1: 4, dissolving at the temperature of 50 ℃ for 4 hours, slowly adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, continuously heating in the pin removing process until denitration is completed, stopping heating, and dissolving to obtain gold aqua regia;
e. vacuum filtering and washing the dissolved gold aqua regia until the pH value of the filtrate is neutral;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia, wherein the addition amount of the anhydrous sodium sulfite is 1kg of gold, and 450g of the anhydrous sodium sulfite is needed, until the gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder at the drying temperature of 140 ℃ for 3 h;
h. and smelting the dried gold powder to obtain gold blocks, adding borax in the smelting process, wherein the smelting temperature is 1300 ℃, the smelting time is 50min, and obtaining the gold blocks after the smelting is finished.
TABLE-recovery of gold from gold-containing waste liquors under the above test conditions
| Gold-containing waste liquid (L) | Au content/(g/L) | Gold/g should be recovered | Final recovery of gold/g | Recovery rate |
| 50 | 0.35 | 17.50 | 17.33 | 99.02％ |
| 50 | 0.33 | 16.50 | 16.39 | 99.31％ |
| 70 | 0.35 | 24.50 | 24.28 | 99.11％ |
| 80 | 0.34 | 27.2 | 26.97 | 99.16％ |
| 100 | 0.36 | 36.00 | 35.79 | 99.43％ |
In conclusion, the method for recovering gold from the gold-containing waste liquid has high recovery rate of gold elements in the gold-containing waste liquid, simplifies the recovery process flow, can ensure that the leaching rate of gold in the gold-containing waste liquid is up to more than 99 percent, and reduces the difficulty of subsequent purification.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The method for recovering gold from the gold-containing waste liquid is characterized by comprising the following steps of:
a. putting the gold-containing waste liquid into a reaction kettle, adding iron powder into the reaction kettle to replace gold in the gold-containing waste liquid, and adding the iron powder while stirring until the gold is completely replaced:
b. filtering and washing the replaced gold tail liquid to obtain gold slag;
c. and (3) adding the filtered gold slag into a hydrochloric acid solution to remove iron from the gold slag:
d. adding the gold slag subjected to iron removal into a reaction kettle, adding aqua regia into the reaction kettle to dissolve the gold slag subjected to iron removal, adding hydrochloric acid into the reaction kettle to remove the pin of the gold slag liquid, and obtaining the aqua regia after denitration is completed;
e. filtering and washing the dissolved gold aqua regia;
f. adding the filtered and washed gold aqua regia into a reduction barrel, and slowly adding anhydrous sodium sulfite into the filtered gold aqua regia until gold powder in the gold aqua regia is completely reduced;
g. filtering and washing the reduced gold powder, and drying the gold powder;
h. and smelting the dried gold powder to obtain gold blocks.
2. The method for recovering gold from gold-containing waste liquor according to claim 1, wherein in step a, the gold-containing waste liquor is an alkaline solution with a pH value of 11-13.
3. The method for recovering gold from the gold-containing waste liquid according to claim 1, wherein in the step a, the gold-containing waste liquid in the reaction kettle is heated to 35-50 ℃ until gold substitution is completed, the heating is stopped, and the substituted gold tail liquid is allowed to stand for 1-4h to room temperature.
4. The method for recovering gold from gold-containing waste liquor according to claim 1, wherein in the step a, when adding iron powder to replace gold, the adding amount of the iron powder is 4-6 times of the weight of each kilogram of gold.
5. The method for recovering gold from gold-containing waste liquid according to claim 1, wherein in step b, the gold tail liquid after replacement is filtered and washed until the pH value of the filtrate is neutral.
6. The method for recovering gold from gold-containing waste liquid according to claim 1, wherein in step c, the filtered gold slag is slowly added into the hydrochloric acid solution, and after the gold slag is completely added into the hydrochloric acid solution, 0.3-1L hydrochloric acid solution is added until the gold slag in the hydrochloric acid solution does not react any more.
7. The method for recovering gold from gold-containing waste liquid according to claim 1, wherein in step d, after the gold slag after iron removal is dissolved in aqua regia at the temperature of 30-50 ℃ for 1-4h, the heating is continuously carried out in the denitration process until the denitration is completed, and the heating is stopped, so that the gold aqua regia is obtained after the dissolution is completed.
8. The method for recovering gold from the gold-containing waste liquid according to claim 1, wherein in the step d, the mass ratio of the gold slag to the aqua regia is 1: 2-4.
9. The method for recovering gold from gold-containing waste liquor according to claim 1, wherein in step f, when anhydrous sodium sulfite is added to reduce gold, the amount of the anhydrous sodium sulfite added is 1/5-3/5 per kg of gold nugget weight.
10. The method for recovering gold from the gold-containing waste liquid as claimed in claim 1, wherein in the step g, the drying temperature of the gold powder is 100-.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071323A (en) * | 2010-12-16 | 2011-05-25 | 惠州市奥美特环境科技有限公司 | Method for producing high-purity gold by utilizing electroplating waste liquid containing gold |
| CN108950202A (en) * | 2018-07-26 | 2018-12-07 | 中南大学 | A method of recycling gold from Acidic Thiourea Leaching Liquor |
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2021
- 2021-11-29 CN CN202111438911.9A patent/CN114277257A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071323A (en) * | 2010-12-16 | 2011-05-25 | 惠州市奥美特环境科技有限公司 | Method for producing high-purity gold by utilizing electroplating waste liquid containing gold |
| CN108950202A (en) * | 2018-07-26 | 2018-12-07 | 中南大学 | A method of recycling gold from Acidic Thiourea Leaching Liquor |
Non-Patent Citations (1)
| Title |
|---|
| 李培铮，吴延之编著: "《黄金生产加工技术大全》", 31 December 1995, 长沙：中南工业大学出版社 * |
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