CN1302911A - Process for extracting gold (silver) from gold (silver) ore by cyanation - Google Patents
Process for extracting gold (silver) from gold (silver) ore by cyanation Download PDFInfo
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- CN1302911A CN1302911A CN 00114309 CN00114309A CN1302911A CN 1302911 A CN1302911 A CN 1302911A CN 00114309 CN00114309 CN 00114309 CN 00114309 A CN00114309 A CN 00114309A CN 1302911 A CN1302911 A CN 1302911A
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Abstract
A process for extracting gold or silver from gold or silver ore by cyanation method includes such steps as grinding ore, impregnating in alkaline solution of cyanide, then stacking for supplying oxygen to reach sufficient contact between gold or silver, oxygen, cyanide and water to dissolve gold or silver in water and preparing ore slurry and gold or silver solution for extraction. Its advantages are no defects due to stirring cyanidation and stack-impregnation process, high productivity and high recovery rate.
Description
The invention relates to a method for extracting gold and silver from gold and silver minerals.
At present, the cyaniding leaching extraction method of the gold and silver-containing mineral mainly comprises stirring cyaniding, heap leaching and the like. The extraction method of agitation cyaniding leaching is to grind and dissociate the mineral to the required degree, then mix the mineral and the prepared solution containing cyanogen into ore pulp, and complete the whole process of leaching gold and silver in liquid phase. The method is carried out in a container with a certain volume, so the method is limited by the capacity of equipment and an operation period, and the gold and silver in the minerals are insufficiently oxidized, so that part of the gold and silver is left in tailings and cannot be recycled, and the resource waste is caused; the heap leaching method is a method of crushing minerals into ore blocks with certainparticle size, stacking the ore blocks and leaching the ore blocks by using cyanide solution, and because the ore blocks require good water permeability and fixed stacking, gold and silver contained in the minerals cannot be fully contacted with a medicament and the ore particles cannot be overturned due to large particle size, so that the gold and silver cannot be fully extracted.
The invention aims to provide a method for extracting gold and silver from gold and silver minerals through cyanidation, aiming at overcoming the defects of the prior art, so that the gold and silver in the minerals can be fully oxidized and recovered to a greater extent.
To achieve the object, the invention provides a technical solution: a method for extracting gold and silver from gold and silver minerals through cyanidation comprises the following steps:
1. impregnating the ground gold and silver minerals with a cyanide alkaline solution to ensure that cyanide can be fully distributed on the gold and silver minerals;
2. the impregnated gold and silver minerals are stacked on an anti-leakage facility and are supplied with oxygen, so that the gold and silver contained in the gold and silver minerals are converted into water-soluble gold and silver cyanide, wherein the oxygen supply mode can be that oxygen is supplied by a device, or a medicament capable of releasing oxygen is added, or natural oxygen supply is carried out in the air, and the reaction equation is as follows:
3. mixing the ore with fully oxidized gold and silver and cyanogen-containing solution or water solution to prepare ore pulp, and dissolving the gold and silver-containing cyanide in the solution;
4. and (4) extracting gold and silver from the pulp solution.
The present invention improves the existing method of cyaniding gold and silver in liquid phase to that in solid phase wet state, so that gold and silver in mineral are fully contacted with oxygen, cyanide and water, and after the gold and silver are fully converted into water soluble matter, the ore pulp is prepared to produce gold and silver containing solution for extraction.
The following examples of the invention are described in further detail:
grinding ore containing gold of about 4g/t, lead of about 3 percent, copper of less than 1 percent and pyrite to the range of 100-150 meshes, adding 50Kg/t of lime, dipping the ore in 1 percent sodium cyanide solution, taking out and stacking the ore for 1 month, taking a comprehensive ore sample, mixing the ore and water into slurry according to the ratio of 3: 7, then precipitating, taking clear liquid for assay, and dissolving the clear liquidAnd (4) testing results: the gold content in the water liquid is 1.6g/m3Lead flotation is carried out on the ore, the alkalinity in the ore is too strong, the water consumption is increased to control the alkalinity to be 9-10 so as to be beneficial to lead flotation, the filtrate of the tailing pulp after lead separation contains 0.35g/t gold, the lead concentrate contains 21g/t gold, the filtrate of the ore pulp is adsorbed by active carbon, and the content of the tail liquid after adsorption is 0.001g/m3The gold content on the activated carbon reaches 1 Kg/t.
The tailings after gold extraction by cyanidation of gold-containing pyrite cinder are subjected to a water leaching experiment, the cyanide concentration used in cyanidation of the cinder is 2 per mill of leached gold, the tailings are discharged and filtered by a plate ore filter press, the tailings contain 20% of cyanide solution and contain 1.12g/t of gold, after the tailings are subjected to pressure filtration and stacking for one day, the content of the tailings is 0.88g/t after sampling and water leaching, after 15 days, the content of the tailings is reduced to 0.4g/t by water leaching, the upper surface layer ore of the cyanidation slag pile is filtered by each time, the tailings are prepared into ore pulp by water and a stirring barrel and then are subjected to pile filtration, the filtrate adsorbs the gold by activated carbon, and the gold content of the piled and filtered tailings is about 0.4 g/.
Claims (3)
1. A method for extracting gold and silver from gold and silver minerals through cyanidation comprises the following steps:
(1) impregnating the ground gold and silver minerals with a cyanide alkaline solution;
(2) stacking the impregnated gold and silver minerals on an anti-leakage facility and supplying oxygen, wherein the reaction equation is as follows:
(3) mixing the cyanided gold and silver minerals in the minerals with water solution to prepare ore pulp, and dissolving the cyanided gold and silver in the solution;
(4) and (4) extracting gold and silver from the pulp solution.
2. The method of claim 1, further comprising: the oxygen supply method may be supplying oxygen through a device, naturally supplying oxygen in the air, or supplying oxygen by adding a drug capable of releasing oxygen.
3. The method of claim 1, further comprising: the cyanided gold and silver minerals can also be prepared into ore pulp by using cyanide-containing solution, so that the cyanided gold and silver in the minerals are transferred into the solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114309 CN1302911A (en) | 2000-01-03 | 2000-01-03 | Process for extracting gold (silver) from gold (silver) ore by cyanation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114309 CN1302911A (en) | 2000-01-03 | 2000-01-03 | Process for extracting gold (silver) from gold (silver) ore by cyanation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1302911A true CN1302911A (en) | 2001-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00114309 Pending CN1302911A (en) | 2000-01-03 | 2000-01-03 | Process for extracting gold (silver) from gold (silver) ore by cyanation |
Country Status (1)
| Country | Link |
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| CN (1) | CN1302911A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002601B (en) * | 2009-08-28 | 2012-10-03 | 山东金洲矿业集团有限公司 | Method for extracting gold and silver |
| CN103397197A (en) * | 2013-07-26 | 2013-11-20 | 孙光潮 | Method for extracting gold from gold-containing noble liquid cyanide solution |
-
2000
- 2000-01-03 CN CN 00114309 patent/CN1302911A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002601B (en) * | 2009-08-28 | 2012-10-03 | 山东金洲矿业集团有限公司 | Method for extracting gold and silver |
| CN103397197A (en) * | 2013-07-26 | 2013-11-20 | 孙光潮 | Method for extracting gold from gold-containing noble liquid cyanide solution |
| CN103397197B (en) * | 2013-07-26 | 2014-10-08 | 孙光潮 | Method for extracting gold from gold-containing noble liquid cyanide solution |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |