CN103194770A - Process for extracting gold from low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp via electrodeposition - Google Patents
Process for extracting gold from low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp via electrodeposition Download PDFInfo
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- CN103194770A CN103194770A CN2013100961894A CN201310096189A CN103194770A CN 103194770 A CN103194770 A CN 103194770A CN 2013100961894 A CN2013100961894 A CN 2013100961894A CN 201310096189 A CN201310096189 A CN 201310096189A CN 103194770 A CN103194770 A CN 103194770A
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Abstract
The invention relates to a process for extracting gold from a low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp via electrodeposition. The process comprises the following steps: diluting the low-grade, copper-containing and difficultly-treated goldmine ammonia cyanide leaching pulp to the proper pulp concentration; leading the pulp into an electrodeposition tank and performing the electrodeposition on the pulp; refining the copper-containing gold powder obtained from a cathode, thereby obtaining a high-purity gold ingot and high-purity cathode copper; and discharging the pulp after the electrodeposition into a tailings pond. The process has the advantages that the technological process is short; the gold recovery rate is high; the production cost is low; the comprehensive recovery of copper is realized; the steps of countercurrent washing, carbon adsorption, gold-carrying carbon desorption-electrodeposition and the like in the conventional gold leaching process are omitted; the investment cost is lowered greatly; and the like.
Description
One. technical field
The present invention relates to metallurgy industry, particularly a kind ofly leach the technology that electrodeposition the ore pulp is carried gold from low-grade cupric difficult-treating gold mine ammonia cyanogen.
Two. background technology
Copper mineral normal with the Gold Ore association, when the copper gold cyaniding is leached, have only a large amount of sodium cyanide of adding could obtain higher gold leaching rate, its reason is that a large amount of sodium cyanide and copper mineral react and be consumed.Generally speaking, 1% copper approximately need consume the sodium cyanide of 30kg/t in every leaching ore.The leaching of these copper minerals will consume a large amount of prussiates and dissolved oxygen, and can form the insoluble CuCN precipitation of one deck on gold grain surface, seriously hinder and will have disturbed golden cyanidation-leaching process, thereby cause gold leaching rate to reduce and the sharp increase of sodium cyanide consumption.
For the higher gold mine of copper content, can adopt the pretreated method of flotation or sulfuric acid to remove copper, still, and low-grade cupric difficult-treating gold mine that basic gangue content higher lower for copper content can't utilize aforesaid method economy, remove copper effectively.
Proposed first by Hunt from 1901, ammonia cyanogen method is soaked gold and is proved to be a kind of effective means that from various copper golds selectivity leaches gold.Generally speaking, in the cyaniding leach liquor of standard, add 1～2g/LNH
3After, can obviously improve golden leaching yield, reduce leaching yield and the sodium cyanide consumption of copper.But, ammonia cyanogen leaches ore pulp copper in the countercurrent washing process and can be leached in a large number again, make the copper concentration of embathing in the liquid that enters the charcoal adsorption system improve greatly, cause carrying golden charcoal copper grade and sharply raise, cause golden adsorption rate to descend, carry degradation disadvantageous effect under golden charcoal gold desorb difficulty, the regenerated carbon adsorptive power.
Three. summary of the invention
The objective of the invention is to overcome the deficiency of existing technology, provide a kind of and leach the technology that electrodeposition the ore pulp is carried gold from low-grade cupric difficult-treating gold mine ammonia cyanogen.This technical process is short, less investment, and production cost is low.
The present invention adopts following technical scheme:
After low-grade cupric difficult-treating gold mine ammonia cyanogen leached ore pulp and be diluted to suitable pulp density, be incorporated in the Winning cell, carry out the ore pulp electrodeposition, the cupric bronze that obtains from negative electrode carries out gold refining and obtains high-purity ingot and Cu-CATH-1, and the ore pulp behind the electrodeposition is drained into the mine tailing storehouse.The detailed process condition is as follows:
Ammonia cyanogen leaches ore pulp and is diluted to pulp density 10～50%;
The pH value of ore pulp control 9～14 during the ore pulp electrodeposition;
Cathode current density during the ore pulp electrodeposition is 15～100A/m
2
The ore pulp electrodeposition time is 2～24h.
Per-cent in this specification sheets (%) all refers to mass percent.
Advantage of the present invention:
1, technical process is short, gold recovery is high, production cost is low, can comprehensively reclaim copper;
2, ammonia cyanogen leaches ore pulp and directly carries out electrodeposition, can save the operations such as countercurrent washing, charcoal absorption, gold loaded carbon desorption-electrodeposition of conventional gold extraction technology, can reduce production costs greatly and cost of investment.
Four. description of drawings
Fig. 1 is the schema that the present invention's electrodeposition from low-grade cupric difficult-treating gold mine ammonia cyanogen leaching ore pulp is put forward the technology of gold.
Five. embodiment
As shown in Figure 1, leaching electrodeposition the ore pulp from low-grade cupric difficult-treating gold mine ammonia cyanogen puies forward the technology of gold and comprises the steps and processing condition:
A, ore pulp electrodeposition: ammonia cyanogen is leached ore pulp be diluted to pulp density 10%～50%, be incorporated into then in the electrolyzer, the pH value control 9～14 of ore pulp, cathode current density control 15～100A/m
2, carrying out the ore pulp electrodeposition, electrodeposition 2～24h can obtain the cupric bronze from negative electrode, and the ore pulp that electrodeposition is good is drained into the mine tailing storehouse;
B, gold refining: the cupric bronze from negative electrode obtains, when copper content is low, can adopt " the molten gold of nitric acid removal of impurities-chloroazotic acid-S-WAT reduction-ingot casting " technology to obtain high-purity ingot, the recyclable Cu-CATH-1 that obtains from nitric acid removal of impurities waste water; When the copper content in the cupric bronze is higher, can earlier the cupric bronze be cast anode, carry out cupric electrolysis, obtain Cu-CATH-1 and the anode sludge, the anode sludge can adopt " the molten gold of nitric acid removal of impurities-chloroazotic acid-S-WAT reduction-ingot casting " technology to obtain high-purity ingot.
Below in conjunction with embodiment method of the present invention is described further.
Embodiment 1:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70% contains a large amount of basic gangues), carry out ammonia cyanogen earlier and leach, after leaching end, ore pulp is incorporated in the electrolyzer, and pulp density is diluted to 15%, control pH value about 12.0, carry out the ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is stainless steel plate, cathode current density control 20A/m
2, electrodeposition 8h, gold concentration can be reduced to＜0.02mg/L in the tail washings, tailings gold grade 0.65g/t, the ore pulp behind the electrodeposition enters the mine tailing storehouse, and the cupric bronze that obtains from negative electrode obtains high-purity ingot and Cu-CATH-1 through gold refining, gold recovery 87.29%, the 170 yuan/g of production cost of gold.
Embodiment 2:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70% contains a large amount of basic gangues), carry out ammonia cyanogen earlier and leach, after leaching end, ore pulp is incorporated in the electrolyzer, and pulp density is diluted to 20%, control pH value about 12.0, carry out the ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is stainless steel plate, cathode current density control 15A/m
2, electrodeposition 6h, gold concentration can be reduced to＜0.02mg/L in the tail washings, tailings gold grade 0.75g/t, the ore pulp behind the electrodeposition enters the mine tailing storehouse, and the cupric bronze that obtains from negative electrode obtains high-purity ingot and Cu-CATH-1 through gold refining, gold recovery 85.33%, the 160 yuan/g of production cost of gold.
Embodiment 3:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70% contains a large amount of basic gangues), carry out ammonia cyanogen earlier and leach, after leaching end, ore pulp is incorporated in the electrolyzer, and pulp density is diluted to 15%, control pH value about 12.0, carry out the ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is steel wool electrodeposition (being contained in the cloth bag), cathode current density control 20A/m
2, electrodeposition 8h, gold concentration can be reduced to＜0.02mg/L in the tail washings, tailings gold grade 0.65g/t, the ore pulp behind the electrodeposition enters the mine tailing storehouse, and the cupric bronze that obtains from negative electrode obtains high-purity ingot and Cu-CATH-1 through gold refining, gold recovery 87.79%, the 168 yuan/g of production cost of gold.
Embodiment 4:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70% contains a large amount of basic gangues), carry out ammonia cyanogen earlier and leach, after leaching end, ore pulp is incorporated in the electrolyzer, and pulp density is diluted to 20%, control pH value about 12.0, carry out the ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is steel wool electrodeposition (being contained in the cloth bag), cathode current density control 15A/m
2, electrodeposition 6h, gold concentration can be reduced to＜0.02mg/L in the tail washings, tailings gold grade 0.75g/t, the ore pulp behind the electrodeposition enters the mine tailing storehouse, and the cupric bronze that obtains from negative electrode obtains high-purity ingot and Cu-CATH-1 through gold refining, gold recovery 85.83%, the 158 yuan/g of production cost of gold.
Comparative Examples 1:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, contain a large amount of basic gangues), earlier with sulfuric acid (consumption 600kg/t) pre-treatment copper removal, pretreated ore pulp (copper content is 0.12%) control pulp density 25%, regulate pH value about 12.0, add the 5kg/t sodium cyanide, agitation leach 48h, the ore pulp after the leaching carries out countercurrent washing, press filtration, tailings (gold grade 0.95g/t) enters the mine tailing storehouse, supernatant liquor enters the charcoal adsorption system, carries golden charcoal and carries out High Temperature High Pressure non-cyanide desorption-electrodeposition, and gold mud carries out gold refining and obtains high-purity ingot, gold recovery 82.90%, the 208 yuan/g of production cost of gold.
Comparative Examples 2:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, contain a large amount of basic gangues), control pulp density 25%, regulate pH value about 12.0, add the 15kg/t sodium cyanide, agitation leach 48h, ore pulp after the leaching carries out countercurrent washing, press filtration, and tailings (gold grade 1.55g/t) enters the mine tailing storehouse, and supernatant liquor enters the charcoal adsorption system, carry golden charcoal and carry out High Temperature High Pressure non-cyanide desorption-electrodeposition, gold mud carries out gold refining and obtains high-purity ingot, gold recovery 69.69%, the 228 yuan/g of production cost of gold.
Claims (5)
1. electrodeposition is put forward golden technology from low-grade cupric difficult-treating gold mine ammonia cyanogen leaching ore pulp, it is characterized in that: after low-grade cupric difficult-treating gold mine ammonia cyanogen leaching ore pulp is diluted to suitable pulp density, be incorporated in the electrolyzer, carry out the ore pulp electrodeposition, the cupric bronze that obtains from negative electrode carries out gold refining and obtains high-purity ingot and Cu-CATH-1, and the ore pulp behind the electrodeposition is drained into the mine tailing storehouse.
2. according to claim 1ly leach the technology that electrodeposition the ore pulp is carried gold from low-grade cupric difficult-treating gold mine ammonia cyanogen, it is characterized in that: ammonia cyanogen leaches ore pulp and is diluted to pulp density 10～50%.
3. according to claim 1ly leach the technology that electrodeposition the ore pulp is carried gold from low-grade cupric difficult-treating gold mine ammonia cyanogen, it is characterized in that: the pH value of ore pulp controls 9～14 during described ore pulp electrodeposition.
4. according to claim 1ly leach the technology that electrodeposition the ore pulp is carried gold from low-grade cupric difficult-treating gold mine ammonia cyanogen, it is characterized in that: the cathode current density during described ore pulp electrodeposition is 15～100A/m
2
5. according to claim 1ly leach the technology that electrodeposition the ore pulp is carried gold from low-grade cupric difficult-treating gold mine ammonia cyanogen, it is characterized in that: the described ore pulp electrodeposition time is 2～24h.
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Cited By (8)
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| CN104120265A (en) * | 2014-06-18 | 2014-10-29 | 厦门紫金矿冶技术有限公司 | Method for recovering gold and copper from copper-containing cyanation pregnant solution |
| CN104294057A (en) * | 2013-07-16 | 2015-01-21 | 厦门紫金矿冶技术有限公司 | Method for extracting gold from copper-oxide oxidized gold ores |
| CN104674026A (en) * | 2014-12-03 | 2015-06-03 | 厦门紫金矿冶技术有限公司 | Method for extracting gold from gold-containing molybdenum concentrate |
| CN109097794A (en) * | 2018-09-13 | 2018-12-28 | 紫金矿业集团股份有限公司 | The method of silver electrolyte open circuit processing |
| CN110586200A (en) * | 2019-10-08 | 2019-12-20 | 西安凯立新材料股份有限公司 | Regeneration method of gold-carbon catalyst for acetylene hydrochlorination |
| CN110863218A (en) * | 2019-11-27 | 2020-03-06 | 东北大学 | Method for extracting gold by adopting molten salt electrolysis enrichment |
| CN112593073A (en) * | 2020-11-17 | 2021-04-02 | 湖南仁发材料科技有限公司 | Method for recovering valuable metal minerals in tin tailings |
| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104294057A (en) * | 2013-07-16 | 2015-01-21 | 厦门紫金矿冶技术有限公司 | Method for extracting gold from copper-oxide oxidized gold ores |
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| CN104674026A (en) * | 2014-12-03 | 2015-06-03 | 厦门紫金矿冶技术有限公司 | Method for extracting gold from gold-containing molybdenum concentrate |
| CN109097794A (en) * | 2018-09-13 | 2018-12-28 | 紫金矿业集团股份有限公司 | The method of silver electrolyte open circuit processing |
| CN110586200A (en) * | 2019-10-08 | 2019-12-20 | 西安凯立新材料股份有限公司 | Regeneration method of gold-carbon catalyst for acetylene hydrochlorination |
| CN110586200B (en) * | 2019-10-08 | 2022-08-12 | 西安凯立新材料股份有限公司 | Regeneration method of gold-carbon catalyst for acetylene hydrochlorination |
| CN110863218A (en) * | 2019-11-27 | 2020-03-06 | 东北大学 | Method for extracting gold by adopting molten salt electrolysis enrichment |
| CN110863218B (en) * | 2019-11-27 | 2021-11-30 | 东北大学 | Method for extracting gold by adopting molten salt electrolysis enrichment |
| US11319613B2 (en) | 2020-08-18 | 2022-05-03 | Enviro Metals, LLC | Metal refinement |
| US11578386B2 (en) | 2020-08-18 | 2023-02-14 | Enviro Metals, LLC | Metal refinement |
| CN112593073A (en) * | 2020-11-17 | 2021-04-02 | 湖南仁发材料科技有限公司 | Method for recovering valuable metal minerals in tin tailings |
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