CN1263165A - Gold-extracting process by using reusable cyanide gold-leaching lean solution - Google Patents
Gold-extracting process by using reusable cyanide gold-leaching lean solution Download PDFInfo
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- CN1263165A CN1263165A CN 99112122 CN99112122A CN1263165A CN 1263165 A CN1263165 A CN 1263165A CN 99112122 CN99112122 CN 99112122 CN 99112122 A CN99112122 A CN 99112122A CN 1263165 A CN1263165 A CN 1263165A
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- gold
- cyanide
- barren solution
- organic phase
- leaching
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Abstract
The present invention is characterized by that the cyanide gold-extracting barren liquor of traditional cyanide gold-extracting process is returned and reused after it is treated, and said barren liquor is treated by means of chemical precipitation process or solvent extractiion process, in which the solvent extraction process uses organic amine as extracting agent, high-carbon alcohol as additive and sulfonated kerosene as diluent, which are formed into organic phase for extraction according to a certain proportion, then the organic phase is contacted with said cyanide gold-extracting barren liquor, and the metal complex anions can be extracted in organic phase. Said gold-extracting process has no pollution to environment, and implements zero discharge of cyanide waste liquor.
Description
The invention relates to a gold extraction process, in particular to a gold extraction process for reusing cyanide gold leaching barren solution.
At present, a cyanide gold leaching barren solution in a cyanide gold extraction process contains a certain amount of cyanide and some pollutants, such as a copper cyanide complex, a zinc cyanide complex and the like, which cause a large amount of accumulation in the barren solution recycling process, thereby influencing the recovery rate of gold and improving the production cost. Therefore, the barren solution is completely or partially discharged, namely cyanogen is destroyed or recovered after treatment and then is discharged as waste water, so that the heavy metal ions in the gold extraction process are not accumulated. Cyanide belongs to a highly toxic substance, and discharged cyanide-containing wastewater seriously pollutes the environment and also causes harm to the life of people.
The invention aims to overcome the defects of the prior art and provide a gold extraction process which does not discharge barren liquor, does not pollute the environment, does not harm the life of people, changes waste into valuable and recycles barren liquor.
The aim of the invention can be achieved by the following measures, namely, the gold extraction process for reusing the cyanide gold-leaching barren solution is characterized in that the cyanide gold-leaching barren solution in the traditional cyanide gold extraction process is returned for use after being treated. The cyanide gold leaching barren solution is treated by a chemical precipitation method or a solvent extraction method. The solvent extraction method is characterized in that organic amine is used as an extracting agent, high-carbon alcohol is used as an additive, sulfonated kerosene is used as a diluent, an extraction organic phase is formed according to a proportion, and the organic phase is contacted with a cyaniding gold leaching barren solution to extract metal complexing anions into the organic phase. The organic amine, the high-carbon alcohol and the sulfonated kerosene are respectively 3-50%, 2-45% and 5-95% in volume percentage in the organic phase. The organic amine can be tertiaryalkyl amine, quaternary ammonium salt, secondary alkyl amine, and the higher alcohol can be octal alcohol, isooctyl alcohol, and decyl alcohol. And in the extraction process, the pH value of the cyaniding gold leaching barren solution is 8-14.
Compared with the prior art, the invention has the following advantages: the barren liquor is treated, so that the cyanide gold-leaching barren liquor is recycled, and the discharge of the cyanide gold-leaching barren liquor is avoided. Thus, the method has no pollution to the environment, does not cause harm to the life of people, and changes waste into valuable.
Description of the drawings:
FIG. 1 is a flow chart of a zinc powder replacement method in a cyaniding gold extraction process.
FIG. 2 is a flow chart of a carbon slurry adsorption method in a cyaniding gold extraction process.
The invention is explained in detail below with reference to the accompanying drawings and several examples of treating cyanided gold-leaching barren liquor by solvent extraction are given:
dissolving gold ore or gold concentrate in cyanide solution, removing leaching residue, replacing the leachate with zinc powder to obtain gold mud, smelting gold, treating cyanide gold leaching barren solution with chemical precipitation method or solvent extraction method, and recycling.
Dissolving cyanide solution for gold ore or gold concentrate to make metals including gold, removing leaching residue, adsorbing the leaching solution with activated carbon to obtain gold and form carbon gold, smelting gold, treating cyanide gold leaching barren solution with chemical precipitation or solvent extraction method, and recycling.
The chemical precipitation method is a traditional treatment method of cyaniding gold leaching barren liquor. The solvent extraction method is characterized in that organic amine is used as an extracting agent, high-carbon alcohol is used as an additive, sulfonated kerosene is used as a diluent, an extraction organic phase is formed according to a proportion, the organic phase is contacted with a cyanide gold leaching barren solution, so that metal complex anions are extracted into the organic phase, and the cyanide gold leaching barren solution is recycled. The organic amine can be tertiary alkyl amine, quaternary ammonium salt and secondary alkyl amine. The higher alcohol can be octal, isooctyl alcohol, and decyl alcohol. The following is a reaction mechanism of extracting metal by using alkyl tertiary amine as an extracting agent, and the reaction mechanism is an anion exchange process.
In example 1, 3% of alkyl tertiary amine, 2% of octa-carbon alcohol and 95% of sulfonated kerosene are weighed according to volume percentage, and are uniformly mixed to form an extraction organic phase, the extraction organic phase is contacted with a cyanide gold leaching barren solution with a pH value of 8, so that metal Cu and Zn complex anions are extracted into the organic phase, and the treated cyanide gold leaching barren solution is recycled.
In example 2, 50% of alkyl tertiary amine, 45% of octa-carbon alcohol and 5% of sulfonated kerosene are weighed according to volume percentage and mixed uniformly to form an extraction organic phase, the extraction organic phase is contacted with a cyanide gold leaching barren solution with a pH value of 14, so that metal Cu and Zn complex anions are extracted into the organic phase, and the treated cyanide gold leaching barren solution is recycled.
In example 3, 30% of secondary alkylamine, 30% of isooctanol and 50% of sulfonated kerosene are taken according to volume percentage, and are uniformly mixed to form an extraction organic phase, the extraction organic phase is contacted with a cyanide gold leaching barren solution with a pH value of 10, so that metal Cu and Zn complex anions are extracted into the organic phase, and the treated cyanide gold leaching barren solution is recycled.
Example 4, 50% of quaternary ammonium salt, 45% of decanol and 5% of sulfonated kerosene are weighed according to volume percentage, and are uniformly mixed to form an extraction organic phase, the extraction organic phase is contacted with a cyanide gold leaching barren solution with a pH value of 13, so that metal Cu and Zn complex anions are extracted into the organic phase, and the treated cyanide gold leaching barren solution is recycled.
In example 5, 3% of alkyl tertiary amine, 45% of octa-carbon alcohol and 50% of sulfonated kerosene are weighed according to volume percentage and mixed uniformly to form an extraction organic phase, the extraction organic phase is contacted with a cyanide gold leaching barren solution with a pH value of 8, so that metal Cu and Zn complex anions are extracted into the organic phase, and the treated cyanide gold leaching barren solution is recycled.
Claims (6)
1. A gold extraction process for reusing cyanide gold-leaching barren solution is characterized in that cyanide gold-leaching barren solution in the traditional cyanide gold extraction process is treated and then returned for use.
2. The gold extraction process of reusing cyanide gold-leaching barren solution according to claim 1, characterized in that the cyanide gold-leaching barren solution is treated by chemical precipitation or solvent extraction.
3. The process for extracting gold from reusable cyanide gold-leaching barren solution according to claim 2, wherein the solvent extraction method comprises using organic amine as extractant, higher alcohol as additive, sulfonated kerosene as diluent, and mixing the organic phase with cyanide gold-leaching barren solution in proportion to obtain organic phase, and contacting the organic phase with cyanide gold-leaching barren solution to extract metal complex anion into organic phase.
4. The gold extraction process of the reusable cyanidation gold leaching barren solution according to claim 3, characterized in that the organic amine, the higher alcohol and the sulfonated kerosene respectively account for 3-50%, 2-45% and 5-95% in volume percentage.
5. The process of claim 3 or 4, wherein the organic amine is tertiary alkyl amine, quaternary ammonium salt or secondary alkyl amine, and the higher alcohol is octa-alcohol, isooctanol or decanol.
6. The gold extraction process for reusing cyanide gold-leaching barren solution according to claim 3, characterized in that the pH of the cyanide gold-leaching barren solution is 8-14 during the extraction process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112122 CN1263165A (en) | 1999-03-18 | 1999-03-18 | Gold-extracting process by using reusable cyanide gold-leaching lean solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112122 CN1263165A (en) | 1999-03-18 | 1999-03-18 | Gold-extracting process by using reusable cyanide gold-leaching lean solution |
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| Publication Number | Publication Date |
|---|---|
| CN1263165A true CN1263165A (en) | 2000-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99112122 Pending CN1263165A (en) | 1999-03-18 | 1999-03-18 | Gold-extracting process by using reusable cyanide gold-leaching lean solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350677A (en) * | 2015-07-16 | 2017-01-25 | 东北大学 | Method for extracting copper-containing cyanided waste liquid by solvent to recycle copper |
-
1999
- 1999-03-18 CN CN 99112122 patent/CN1263165A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350677A (en) * | 2015-07-16 | 2017-01-25 | 东北大学 | Method for extracting copper-containing cyanided waste liquid by solvent to recycle copper |
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