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A fungal pre-oxidation method for dual refractory gold ores containing arsenic and carbon

A double intractable, pre-oxidation technology, applied in the direction of improving process efficiency, can solve the problems of complex process, improper control, harsh carbonaceous material ashing conditions, etc., to simplify the process flow, save production costs, and maintain competitive advantages. Effect

Active Publication Date: 2016-04-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process has the following disadvantages: ① high energy consumption, easy to cause environmental pollution; ② over-roasting is easy to form secondary physical wrapping of gold and crack closure of pores, resulting in secondary refractory gold leaching; ③ carbonaceous ashing conditions Harsh, improper control, easy to activate carbonaceous residues; ④ gold and arsenic easily form arsenic-gold alloy and volatilize
[0008] The two-step biological oxidation method has the disadvantages of long process, complicated process and high production cost because it involves the connection and transformation of two degradation systems.

Method used

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  • A fungal pre-oxidation method for dual refractory gold ores containing arsenic and carbon
  • A fungal pre-oxidation method for dual refractory gold ores containing arsenic and carbon
  • A fungal pre-oxidation method for dual refractory gold ores containing arsenic and carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The refractory gold concentrate containing arsenic and carbon contained in this example comes from a gold mine in Sichuan. The content of its main elements is shown in Table 1. The particle size analysis after grinding shows that about 80% of the gold concentrate has a particle size of ≤100 μm. The main gold-loaded sulfides in the ore are pyrite and arsenopyrite. According to conventional cyanidation gold extraction, that is, during cyanidation, the pulp concentration is 25%, the NaCN concentration is 0.1%, and the aeration volume is 0.2m 3 / h, the stirring speed is 1000r / min. After cyaniding for 48 hours, filter, wash with distilled water for 6 times, and then dry. The gold content in the cyanide slag and cyanide solution is determined. The direct cyanide leaching rate of gold is only 16.46%.

[0038] Table 1 Example 1 The content of the main elements of the gold concentrate

[0039]

[0040] 1. Fungal culture

[0041] Under sterile conditions, the spores produce...

example 1

[0046] The cyanidation gold extraction result before and after the action of table 2 example 1 gold concentrate bacteria

[0047]

Embodiment 2

[0049] The gold concentrate treated in this example comes from a gold mine in Shaanxi. The content of its main elements is shown in Table 3. The particle size analysis after grinding shows that about 88% of the concentrate has a particle size of ≤100 μm. The main gold-carrying sulfides in this gold ore are pyrite and arsenopyrite. According to the conventional method in Example 1 for cyanidation to extract gold, the direct cyanide leaching rate of gold is only 12.19%.

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Abstract

The purpose of this invention is that since the two-step biological oxidation method for treating double refractory gold ores has the disadvantages of long process, complex technology, and high production cost, there is an urgent need for a method that can effectively treat arsenic sulfide and gold-containing carbonaceous matter in gold ores. Methods. The invention provides a fungal pre-oxidation method for arsenic-containing and carbon-containing double refractory gold mines. The method utilizes Phanerochaete? chrysosporium-CCTCC? M2013616) to amplify the culture, and then combines nitrogen-limited medium and gold ore powder. and fungal liquid were added to a biological oxidation constant-temperature mixer for non-sterile oxidative degradation for 5 to 15 days. The arsenic and carbon contents in the gold ore powder were significantly reduced. The pretreated fungal oxidation residue is used to extract gold by conventional cyanidation method. The cyanide gold extraction rate of gold ore powder is increased from about 10% to more than 89%, achieving one-step oxidation pretreatment of double refractory gold ores containing arsenic and carbon. , the economic benefits are very significant.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, in particular to a microbial pre-oxidation method for double refractory gold ores containing arsenic and carbon. Background technique [0002] Arsenic-containing and carbon-containing double refractory gold mines refer to a type of gold mines containing arsenic-containing sulfides and gold-robbing carbonaceous substances, and the gold recovery rate is very low. This type of gold mines is distributed in China, the United States, Australia, Russia and other parts of the world . In refractory gold ores containing arsenic and carbon, gold is often disseminated in sulfide minerals such as arsenopyrite, pyrite, and chalcopyrite in the form of micro-submicroscopic or even lattice gold, which affects the relationship between gold and leaching. Effective exposure of the gold reagent. Carbonaceous substances affecting gold leaching in refractory gold ores mainly include elemental carbon, organic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 杨洪英刘倩佟琳琳
Owner NORTHEASTERN UNIV LIAONING
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