Heap-leaching based biological pre-oxidation method for refractory gold ore

A refractory gold ore pre-oxidation technology, applied in the direction of improving process efficiency, can solve the problem of rapid dissolution of difficult ferrous iron, and achieve the effects of improving oxidation efficiency, reducing production costs, and easy control of process parameters

Active Publication Date: 2015-03-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Claims
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AI Technical Summary

Problems solved by technology

However, according to the growth characteristics of iron-oxidizing bacteria, it is difficult to realize the efficient biological oxidation of ferrous iron and the rapid dissolution of pyrite in the same ore heap.

Method used

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  • Heap-leaching based biological pre-oxidation method for refractory gold ore

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Experimental program
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Effect test

Embodiment 1

[0028] In the biocolumn leaching oxidation test of pyrite concentrate, the pyrite content is 94%, and the main element components are: Fe 46.9%, TS 44.47%, Si 5.51%, Al 2.28%. The raw ore is selected-crushed-flotation to obtain pure pyrite, and then the -20mm concentrate is screened and packed into a column after rod milling and vibration. The inner diameter of the leaching column is 60mm and the effective height is 400mm. , the peristaltic pump flow rate is 150L / m 2 h. The temperature of the column leaching test is 60°C, and the temperature of the leaching solution is 55°C to 60°C. When the pH value of the oxidation solution is lower than 1.5, use limestone to neutralize, adjust the pH to 1.5-1.7, and the initial total iron concentration is 3.89g / L. In the biological oxidation fixed bed for adsorbing bacterial species, the temperature of the fixed bed is 30-35°C. After being oxidized by microorganisms in the fixed bed, the oxidation-reduction potential is controlled at 890...

Embodiment 2

[0034] In the industrial test of bioheap leaching pre-oxidation of a low-grade refractory gold ore, the ore contained 5.3% sulfur, 0.2% arsenic, and the gold grade was 2.3g / t. Crush the ore to -20mm and build a heap with a height of 20 meters. Intermittent spraying is adopted, the spraying time is 6 hours a day, and the spraying intensity is 6L / m 2 h; when the temperature of the leachate is lower than 45°C, reduce the spraying time and maintain the temperature of the leachate at 50°C to 55°C. In the initial stage of leaching, the acidic pit water of the mine is used for spraying, and the leachate is oxidized by the fixed bed of activated carbon as the main carrier and then returned to the spray pool for circular spraying; the acidophilic bacteria in the fixed bed of activated carbon are mainly from the iron-sulfur in the pit water. Oxidizing bacteria (including Spirulina ferrooxidans and Thiobacillus ferrooxidans, etc.); when the pH value of the leachate is lower than 1.5, us...

Embodiment 3

[0036] In the industrial test of bioheap leaching pre-oxidation of a low-grade refractory gold ore, the ore contained 5.3% sulfur, 0.2% arsenic, and the gold grade was 2.3g / t. Crush the ore to -20mm and build a heap with a height of 15 meters. Intermittent spraying is adopted, the spraying time is 6 hours a day, and the spraying intensity is 6L / m 2 h; when the leachate temperature is lower than 45°C, reduce the spraying time and maintain the leachate temperature at 45-50°C. In the initial stage of leaching, the acidic pit water of the mine is used for spraying, and the leachate is oxidized by the fixed bed of activated carbon as the main carrier and then returned to the spray pool for circular spraying; the acidophilic bacteria in the fixed bed of activated carbon mainly come from the iron-sulfur in the pit water. Oxidizing bacteria (including Spirulina ferrooxidans and Thiobacillus ferrooxidans, etc.); when the pH value of the leachate is lower than 1.5, use limestone to neu...

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Abstract

The invention belongs to the field of hydrometallurgy, and particularly relates to a heap-leaching based biological pre-oxidation method for refractory gold ore. The heap-leaching based biological pre-oxidation method for refractory gold ore comprises the following steps: (1) breaking raw ore into pieces, heaping the broken ore, spray-leaching the heaped low-grade refractory gold ore, and controlling the temperature of a leachate to be above 45 DEG C; (2) neutralizing the leachate to increase the pH value thereof to 1.5-1.9 if the pH value of the leachate is lower than 1.5; (3) feeding the neutralized leachate into a biological fixed bed, oxidizing ferrous iron into ferric iron with acidophilic bacteria adsorbed by the biological fixed bed, and obtaining a high-potential oxidation solution after the oxidation-reduction potential of a solution is more than 850mV; and (4) spaying the high-potential oxidation solution obtained in the step (3) onto the low-grade refractory gold ore circularly until the pre-oxidation of the refractory gold ore is finished. The process provided by the invention is simple, and the procedure parameters of the process are easy to control. By adopting the process, the dissolution of a large amount of pyrite can be promoted effectively, the oxidation efficiency can be improved, and the production cost can be reduced.

Description

technical field [0001] The present invention relates to the field of hydrometallurgy, in particular, the present invention relates to a bioheap leaching pre-oxidation method for refractory gold ores, which is especially suitable for low-grade gold ores containing arsenic and high sulfur and pyrite as the main gold-carrying mineral. Heap leaching pre-oxidation. Background technique [0002] Refractory gold ore pre-oxidation technologies include roasting method, hot pressing method and biological method, which are mainly used in pre-oxidation of flotation gold concentrate and high-grade raw ore. Due to the continuous mining and utilization of gold mines, high-grade and easy-to-handle gold ore resources have become less and less, and a large number of low-grade and refractory gold ore resources have not been effectively utilized. The academic and industrial circles at home and abroad have been looking for new technologies to effectively utilize low-grade gold deposits, among w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B11/00
CPCY02P10/20
Inventor 阮仁满谭巧义孙和云伍赠玲衷水平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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