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Method for extracting gold from high basic gangue containing arsenic and carbon

A technology of high alkalinity and gangue, applied in the field of gold extraction from arsenic-containing and carbon-containing high-alkaline gangue, can solve the problems of high neutralization cost and high Fe3+, and achieve the effect of improving permeability

Active Publication Date: 2013-07-10
ZIJIN MINING GROUP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there are inevitably problems such as high acidity, high Fe3+, and high neutralization cost of As-containing oxidation waste liquid in the hot-pressed oxidation of gold concentrate biological oxidant. The neutralization cost accounts for more than 40% of the total production cost. At present, lime is mainly used in industry. Neutralize and oxidize waste liquid
[0006] Above studies all do not relate to the method and content of the present invention, therefore seek a kind of process simple, cost is low, the method for processing this type of gold ore that gold recovery rate is high has important significance

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  • Method for extracting gold from high basic gangue containing arsenic and carbon
  • Method for extracting gold from high basic gangue containing arsenic and carbon
  • Method for extracting gold from high basic gangue containing arsenic and carbon

Examples

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example 1

[0035] Example 1: Au, S, CaO, MgO, Al2O3 contents are respectively 3g / t, 1.20%, 20.00%, 12.00%, 1.92% highly alkaline gangue containing As, carbon containing microfine refractory gold ore for flotation , the gold content of gold concentrate is 25g / t, the contents of pyrite and arsenopyrite are 45.32% and 2.02% respectively, and the sulfide wrapped gold such as pyrite is 70.50%; the contents of CaO, MgO and Al2O3 in flotation tailings are 20.05% respectively. %, 5.42%, 4.13%. The gold concentrate adopts biological oxidation-carbon leaching gold, the gold leaching rate is 96.08%, the pH of the oxidation solution is 1.20, the Fe and As contents are 30.02g / L and 1.11g / L respectively, the Fe / As ratio is 27.04, Fe2+=50mg / L, As3+=0.15mg / L. Tailings are used to neutralize the oxidation solution. When the amount of tailings is 305kg / m3 oxidation waste liquid, the pH of the neutralization solution is 6.58. The content of each harmful metal ion in the neutralization solution reaches th...

example 2

[0036] Example 2: Floating refractory gold ores with highly alkaline gangue containing As and carbon containing microfine particles with Au, S, CaO, MgO, and Al2O3 contents of 4g / t, 2.00%, 25.23%, 14.24%, and 1.92% respectively The gold content in the flotation gold concentrate is 28.08g / t, the contents of pyrite and arsenopyrite are 50.36% and 4.00% respectively, and the gold contained in pyrite and other sulfides is 72.08%; the flotation tailings CaO, MgO, Al2O3 The contents are 28.15%, 16.05%, and 5.13%, respectively. The obtained gold concentrate was extracted by hot-pressed oxidation-carbon leaching, the gold leaching rate was 97.15%, the pH of the oxidation solution was 0.53, the Fe and As contents were 32g / L and 0.5g / L respectively, the Fe / As ratio was 64.00, and the Fe2+ =30mg / L, As3+=0.12mg / L. Tailings are used to neutralize the oxidation solution. When the amount of tailings is 400kg / m3 oxidation waste liquid, the pH of the neutralization solution is 7.59, and the c...

example 3

[0037]Example 3: Floating highly alkaline gangue containing As and carbon-containing fine-grained refractory gold ores with Au, S, CaO, MgO, and Al2O3 contents of 6g / t, 1.85%, 30.0%, 16.0%, and 3.0% respectively The gold content in the flotation gold concentrate is 35.06g / t, the contents of pyrite and arsenopyrite are 70% and 4.0% respectively, and the sulfide wrapping gold such as pyrite is 74%; the flotation tailings CaO, MgO, Al2O3 The contents are 33%, 18.02%, and 6.00%, respectively. The obtained gold concentrate adopts biological oxidation-carbon leaching gold, the gold leaching rate is 97.15%, the pH of the oxidation solution is 0.90, the Fe and As contents are 40.00g / L and 3.0g / L respectively, the Fe / As ratio is 13.3, and the Fe2+ =100mg / L, As3+=0.40mg / L. Tailings are used to neutralize the oxidation solution. When the amount of tailings is 338kg / m3 oxidation waste liquid, the pH of the neutralization solution is 7.05, and the content of each harmful metal ion in the ...

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Abstract

The invention relates to a method for extracting gold from high basic gangue containing arsenic and carbon. The method is characterized by comprising the following steps of: firstly performing flotation on micro-fine particles containing the As and carbon of the high basic gangue and gold ore which is difficult to treat to respectively obtain a gold concentrate and tailings of the high basic gangue, then performing gold extraction on the gold concentrate by adopting a biological oxidation-carbon leaching gold extraction process or a hot-pressure oxidation-cyanidation gold extraction process, finally adopting the tailings of the high basic gangue, obtained by flotation, to neutralize high acid, high Fe and As-containing oxidation waste liquid, which are produced by biological oxidation or hot-pressure oxidation, stacking neutralization slag in a tailing pond, and returning neutralization liquid for recycling. According to the method, high-efficient and low-cost recovery of the gold can be realized, and the following situations can be simultaneously realized: (1) harmful ingredients, namely SO4<2->, Fe, As and other harmful ions in an oxidation solution of the gold concentrate can be neutralized with CaO, MgO and other basic gangue in the tailings, and wastes can be used for treating the wastes; (2) the cost of neutralizing biological oxidation waste liquid or hot-pressure oxidation waste liquid is zero; and (3) the As, the Fe and other harmful ions exist in a stable safe state, the permeability of the neutralization tail slag is good, and the safety of the obtained neutralization slag is in line with national and related industry standards.

Description

1. Technical field [0001] The invention belongs to the field of metallurgy and circular economy, and in particular relates to a method for extracting gold from high-alkaline gangue gold ore and treating waste with waste to reduce production costs, especially involving arsenic-containing and carbon-containing high-alkaline gangue method of extracting gold. 2. Background technology [0002] With the continuous development of gold mining, the resources of easy-to-treat gold mines are increasingly exhausted, and a large number of low-grade and difficult-to-treat gold mines have become "dull mines" due to the lack of economical and reasonable dressing and smelting processes, and the gold content in them is 2-6g / t , about 1 / 3 of my country's gold resources belong to this type of gold mines. Most of these gold mines are high-alkaline gangue-containing As and carbon-containing fine-grained refractory gold mines, and they are mainly distributed in "Yunnan, Guizhou, Guangxi" Provinces ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B11/08C22B3/44
CPCY02P10/20
Inventor 黄中省伍赠玲衷水平王瑞永邹来昌陈景河
Owner ZIJIN MINING GROUP
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