CN103194770B - From low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp, electrodeposition puies forward the technique of gold - Google Patents
From low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp, electrodeposition puies forward the technique of gold Download PDFInfo
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- CN103194770B CN103194770B CN201310096189.4A CN201310096189A CN103194770B CN 103194770 B CN103194770 B CN 103194770B CN 201310096189 A CN201310096189 A CN 201310096189A CN 103194770 B CN103194770 B CN 103194770B
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Abstract
The present invention relates to the technique that electrodeposition from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp carries gold, after low-grade cupric difficult-treating gold mine ammonia-cyanide leaching slurry dilution to the pulp density be applicable to, be incorporated in Winning cell, carry out ore pulp electrodeposition, what obtain from negative electrode carries out gold refining obtain gold ingot and Cu-CATH-1 containing Cu-Zn alloy powder, and the ore pulp after electrodeposition is drained into Tailings Dam.The method has that technical process is short, gold recovery is high, production cost is low, can Recovering Copper; The operations such as the countercurrent washing of conventional gold extraction technology, charcoal absorption, gold loaded carbon desorption-electrodeposition can be saved, greatly can reduce the advantages such as cost of investment.
Description
One. technical field
The present invention relates to metallurgy industry, particularly a kind of from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp electrodeposition carry gold technique.
Two. background technology
Normal and the Gold Ore association of copper mineral, when copper gold Cyanide Leaching, only add a large amount of sodium cyanides and could obtain higher gold leaching rate, its reason is that a large amount of sodium cyanides and copper mineral react and be consumed.Generally, the copper often leaching in ore 1% approximately need consume the sodium cyanide of 30kg/t.The leaching of these copper minerals by a large amount of prussiate of consumption and dissolved oxygen, and can precipitate at the surperficial insoluble CuCN of one deck that formed of gold grain, seriously hinders and disturbs the cyanidation-leaching process of gold, thus cause gold leaching rate to reduce and the sharp increase of sodium cyanide consumption.
For the gold mine that copper content is higher, the method removing copper of flotation or sulfur acid pretreatment can be adopted, but and low-grade cupric difficult-treating gold mine that basic gangue content higher lower for copper content, cannot utilize aforesaid method economy, effectively remove copper.
Proposed first by Hunt from 1901, ammonia cyanogen method leaching gold is proved to be the most effective means of one of Selectively leaching gold from various copper gold.Generally, in the Cyanide Leaching liquid of standard, 1 ~ 2g/LNH is added
3after, the leaching yield of gold can be significantly improved, reduce leaching yield and the sodium cyanide consumption of copper.But, ammonia-cyanide leaching ore pulp copper in countercurrent washing process can be leached again in a large number, the copper concentration of embathing in liquid entering charcoal adsorption system is improved greatly, cause gold loaded carbon copper grade sharply to raise, cause that golden adsorption rate declines, gold loaded carbon gold desorb difficulty, degradation disadvantageous effect under regenerated carbon adsorptive power.
Three. summary of the invention
The object of the invention is the deficiency overcoming existing technique, provide a kind of from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp electrodeposition carry gold technique.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-cyanide leaching slurry dilution to the pulp density be applicable to, be incorporated in Winning cell, carry out ore pulp electrodeposition, what obtain from negative electrode carries out gold refining obtain gold ingot and Cu-CATH-1 containing Cu-Zn alloy powder, and the ore pulp after electrodeposition is drained into Tailings Dam.Detailed process condition is as follows:
Ammonia-cyanide leaching slurry dilution is to pulp density 10 ~ 50%;
During ore pulp electrodeposition, the pH value of ore pulp controls 9 ~ 14;
Cathode current density during 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 Recovering Copper;
2, ammonia-cyanide leaching ore pulp directly carries out electrodeposition, can save the operations such as the countercurrent washing of conventional gold extraction technology, charcoal absorption, gold loaded carbon desorption-electrodeposition, can greatly reduce production cost and cost of investment.
Four. accompanying drawing explanation
Fig. 1 is the schema that the present invention's electrodeposition from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp puies forward the technique of gold.
Five. embodiment
As shown in Figure 1, from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp electrodeposition carry gold technique comprise the steps and processing condition:
A, ore pulp electrodeposition: by ammonia-cyanide leaching slurry dilution to pulp density 10% ~ 50%, be then incorporated in electrolyzer, and the pH value of ore pulp controls 9 ~ 14, and cathode current density controls 15 ~ 100A/m
2, carry out ore pulp electrodeposition, electrodeposition 2 ~ 24h, can obtain containing Cu-Zn alloy powder from negative electrode, the ore pulp that electrodeposition is good is drained into Tailings Dam;
B, gold refining: from negative electrode obtain containing Cu-Zn alloy powder, " the molten gold of nitric acid removal of impurities-chloroazotic acid-S-WAT reduction-ingot casting " technique when copper content is lower, can be adopted to obtain gold ingot, recyclablely from nitric acid removal of impurities waste water obtain Cu-CATH-1; When higher containing the copper content in Cu-Zn alloy powder, first can cast anode by containing Cu-Zn alloy powder, 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 ", and technique obtains gold 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%, the basic gangue containing a large amount of), first carry out ammonia-cyanide leaching, after leaching terminates, be incorporated into by ore pulp in electrolyzer, pulp density is diluted to 15%, control ph about 12.0, carry out ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is stainless steel plate, cathode current density control 20A/m
2electrodeposition 8h, in tail washings, gold concentration can be reduced to <0.02mg/L, tailings gold grade 0.65g/t, ore pulp after electrodeposition enters Tailings Dam, what obtain from negative electrode obtains gold ingot and Cu-CATH-1 through gold refining, gold recovery 87.29% containing Cu-Zn alloy powder, the production cost 170 yuan/g of gold.
Embodiment 2:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, the basic gangue containing a large amount of), first carry out ammonia-cyanide leaching, after leaching terminates, be incorporated into by ore pulp in electrolyzer, pulp density is diluted to 20%, control ph about 12.0, carry out ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is stainless steel plate, cathode current density control 15A/m
2electrodeposition 6h, in tail washings, gold concentration can be reduced to <0.02mg/L, tailings gold grade 0.75g/t, ore pulp after electrodeposition enters Tailings Dam, what obtain from negative electrode obtains gold ingot and Cu-CATH-1 through gold refining, gold recovery 85.33% containing Cu-Zn alloy powder, the production cost 160 yuan/g of gold.
Embodiment 3:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, the basic gangue containing a large amount of), first carry out ammonia-cyanide leaching, after leaching terminates, be incorporated into by ore pulp in electrolyzer, pulp density is diluted to 15%, control ph about 12.0, carry out ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is steel wool electrodeposition (being contained in cloth bag), cathode current density control 20A/m
2electrodeposition 8h, in tail washings, gold concentration can be reduced to <0.02mg/L, tailings gold grade 0.65g/t, ore pulp after electrodeposition enters Tailings Dam, what obtain from negative electrode obtains gold ingot and Cu-CATH-1 through gold refining, gold recovery 87.79% containing Cu-Zn alloy powder, the production cost 168 yuan/g of gold.
Embodiment 4:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, the basic gangue containing a large amount of), first carry out ammonia-cyanide leaching, after leaching terminates, be incorporated into by ore pulp in electrolyzer, pulp density is diluted to 20%, control ph about 12.0, carry out ore pulp electrodeposition, anode is alloy lead anode, and negative electrode is steel wool electrodeposition (being contained in cloth bag), cathode current density control 15A/m
2electrodeposition 6h, in tail washings, gold concentration can be reduced to <0.02mg/L, tailings gold grade 0.75g/t, ore pulp after electrodeposition enters Tailings Dam, what obtain from negative electrode obtains gold ingot and Cu-CATH-1 through gold refining, gold recovery 85.83% containing Cu-Zn alloy powder, the production cost 158 yuan/g of gold.
Comparative example 1:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, basic gangue containing a large amount of), first use sulfuric acid (consumption 600kg/t) pre-treatment copper removal, pretreated ore pulp (copper content is 0.12%) controls pulp density 25%, adjust ph about 12.0, add 5kg/t sodium cyanide, agitation leach 48h, ore pulp after leaching carries out countercurrent washing, press filtration, tailings (gold grade 0.95g/t) enters Tailings Dam, supernatant liquor enters charcoal adsorption system, gold loaded carbon carries out High Temperature High Pressure non-cyanide desorption-electrodeposition, gold mud carries out gold refining and obtains gold ingot, gold recovery 82.90%, the production cost 208 yuan/g of gold.
Comparative example 2:
Certain low-grade cupric difficult-treating gold mine (gold grade 4.5g/t, copper content 0.70%, basic gangue containing a large amount of), control pulp density 25%, adjust ph about 12.0, add 15kg/t sodium cyanide, agitation leach 48h, ore pulp after leaching carries out countercurrent washing, press filtration, and tailings (gold grade 1.55g/t) enters Tailings Dam, and supernatant liquor enters charcoal adsorption system, gold loaded carbon carries out High Temperature High Pressure non-cyanide desorption-electrodeposition, gold mud carries out gold refining and obtains gold ingot, gold recovery 69.69%, the production cost 228 yuan/g of gold.
Claims (4)
1. from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp, electrodeposition puies forward the technique of gold, it is characterized in that: after low-grade cupric difficult-treating gold mine ammonia-cyanide leaching slurry dilution to the mass percent 10 ~ 50% of pulp density, be incorporated in electrolyzer, carry out ore pulp electrodeposition, what obtain from negative electrode carries out gold refining obtain gold ingot and Cu-CATH-1 containing Cu-Zn alloy powder, and the ore pulp after electrodeposition is drained into Tailings Dam.
2. according to claim 1 from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp electrodeposition carry gold technique, it is characterized in that: during described ore pulp electrodeposition ore pulp pH value control 9 ~ 14.
3. according to claim 1 from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp electrodeposition put forward the technique of gold, it is characterized in that: cathode current density during described ore pulp electrodeposition is 15 ~ 100A/m
2.
4. according to claim 1 from low-grade cupric difficult-treating gold mine ammonia-cyanide leaching ore pulp electrodeposition carry gold technique, it is characterized in that: the described ore pulp electrodeposition time is 2 ~ 24h.
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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 |
| CN104120265B (en) * | 2014-06-18 | 2016-06-22 | 厦门紫金矿冶技术有限公司 | The method of gold recovering copper from cupric noble liquid cyanide |
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| 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 |
| 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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