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Cyanidation aurum-extracting method for preprocessing high-arsenic complex refractory gold ore by oxidation with arsenic resistant strains

A refractory gold ore pretreatment technology, applied in the direction of improving process efficiency, can solve the problems that hinder the application of complex and refractory gold ore with high arsenic, complex components, large changes, etc., achieve good activity and oxidation ability, and promote oxidation , The effect of high gold leaching rate

Inactive Publication Date: 2008-12-31
NORTHEASTERN UNIV
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AI Technical Summary

Problems solved by technology

Arsenic is toxic to bacteria, and arsenic content is an important indicator in the process. At present, the arsenic content of refractory gold ores used in industry is controlled at 4-6%. High content (much higher than 6%) and large changes, the composition is extremely complex
This hinders the application of high-arsenic complex refractory gold mines

Method used

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  • Cyanidation aurum-extracting method for preprocessing high-arsenic complex refractory gold ore by oxidation with arsenic resistant strains
  • Cyanidation aurum-extracting method for preprocessing high-arsenic complex refractory gold ore by oxidation with arsenic resistant strains
  • Cyanidation aurum-extracting method for preprocessing high-arsenic complex refractory gold ore by oxidation with arsenic resistant strains

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] The composition of the flotation concentrate processed in this example is shown in Table 2:

[0037] Table 2 embodiment 1 concentrate chemical composition analysis (%)

[0038]

[0039] * Unit: (g / t)

[0040] This ore is a high-arsenic complex and refractory concentrate. The gold in the mineral is mainly wrapped by sulfides such as arsenopyrite and pyrite. The direct cyanide leaching rate of gold is only 21.91%.

[0041] 1. Slurry adjustment of flotation concentrate: the flotation gold concentrate with high arsenic complex and refractory is adjusted according to the pulp concentration of 20-30%.

[0042] 2. Bacterial oxidation flotation concentrate: Add the adjusted pulp into the bacterial oxidation tank, the concentration of the pulp in the oxidation tank is 15%, aerate and stir (aeration volume 0.3 ~ 0.5m 3 / h, the stirring speed is 600-1400rpm), the temperature is kept at 44-60°C, the pH value is kept between 1.0-2.0, and the oxidation time is 192 hours. The o...

Embodiment 1

[0046] Table 3 Example 1 Bacterial Oxidation Pretreatment-Cyanide Gold Extraction Results

[0047]

[0048] After the treatment of the invention, the leaching rate of gold is increased by 68.59% compared with direct cyanide leaching.

example 2

[0050] The composition of the flotation concentrate processed in this example is shown in Table 4:

[0051] Table 4 embodiment 2 concentrate chemical composition analysis (%)

[0052]

[0053] * Unit: (g / t)

[0054] This ore is a high-arsenic complex and refractory concentrate. The gold in the mineral is mainly wrapped by sulfides such as arsenopyrite and pyrite. The direct cyanide leaching rate of gold is only 27.2%.

[0055] 1. Slurry adjustment of flotation concentrate: the flotation gold concentrate with high arsenic complex and refractory is adjusted according to the pulp concentration of 20-30%.

[0056] 2. Bacterial oxidation flotation concentrate: Add the adjusted pulp into the bacterial oxidation tank, the concentration of the pulp in the oxidation tank is 15%, aerate and stir (aeration volume 0.3 ~ 0.5m 3 / h, the stirring speed is 600~1400rpm), the temperature is kept at 44~60°C, the pH value is kept between 1.0~2.0, and the oxidation time is 96 hours. The oxi...

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Abstract

Disclosed is a cyaniding gold extraction method for pre-treating high-arsenic complex refractory gold ore by arsenic-resistant bacteria oxidation, comprising five steps of arsenic-resistant bacteria culture, flotation concentrate mixing, bacterial oxidation of flotation concentrates, solid-liquid separation and cyaniding gold extraction. The cyaniding gold extraction method adopts specific arsenic-resistant bacteria which are prepared by mixing Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans, and conducts oxidation pretreatment of high-arsenic complex refractory gold ore. The high-arsenic complex gold ore containing 8 to 20 percent of arsenic can be pretreated, and the arsenic removal rate is 85 to 98 percent. The leaching rate of gold is up to 90 to 95 percent after cyaniding leaching. The cyaniding gold extraction method adopts unique bacteria for leaching ores, greatly saves cooling cost, conducts direct oxidation of high-arsenic complex gold ore containing 8 to 20 percent of arsenic, and has advantages of being widely adaptable, simple in operation, environmentally friendly and remarkably beneficial.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, and particularly relates to a method for oxidizing and pretreating high-arsenic complex and refractory gold ores by arsenic-resistant bacteria-cyanidation gold extraction. Background technique [0002] Refractory gold ore (also known as refractory gold ore, refractory metallurgical ore, recalcitrant gold ore) means that the ore is directly leached for gold after being ground, and the leaching rate of gold is low or very low. Generally, the leaching rate is 80% as the limit. Those below this are collectively referred to as refractory gold ores. Some ores are extremely difficult to process, and the direct leaching rate of such ores is only 10% to 30%. [0003] About 2 / 3 of the gold resources in the world are refractory ores. At present, about 1 / 3 of the total gold output of foreign developed countries is produced from refractory gold ores, and this proportion is increasing year by year. my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 杨洪英巩恩普杨立佟琳琳
Owner NORTHEASTERN UNIV
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