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Fungus pre-oxidization method for arsenic-containing and carbon-containing double refractorygoldore

A double intractable, pre-oxidation technology, applied in the direction of improving process efficiency, can solve the problems of harsh ashing conditions of carbonaceous materials, improper control, difficult gold leaching, etc. The effect of arsenic decarburization and gold robbing

Active Publication Date: 2014-05-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Fungus pre-oxidization method for arsenic-containing and carbon-containing double refractorygoldore
  • Fungus pre-oxidization method for arsenic-containing and carbon-containing double refractorygoldore
  • Fungus pre-oxidization method for arsenic-containing and carbon-containing double refractorygoldore

Examples

Experimental program
Comparison scheme
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 invention aims at providing a method for effectively treating arsenic-containing sulfides and gold absorption carbonaceous materials in gold ore, which is urgently needed for overcoming the defects of long flow, complex process, high production cost and the like for treating double refractorygoldore by a two-step biological oxidation method. The invention provides a fungus pre-oxidization method for arsenic-containing and carbon-containing double refractorygoldore. The fungus pre-oxidization method comprises the following steps: carrying out amplification culture by using Phanerochaete chrysporium-CCTCC M2013616; then adding a nitrogen-limited medium, gold ore powder and fungus solution into a biological oxidation constant-temperature mixer; carrying out non-sterilizing oxidative degradation on the mixture for 5-15 days to enable the contents of arsenic and carbon in the gold ore powder to be greatly reduced. The gold extraction is performed on the pretreated fungus oxide slag by using a conventional cyanideprocess, so that the cyanide gold extraction rate of the gold ore powder is increased from about 10 percent to over 89 percent, one-step oxidation pretreatment of the arsenic-containing and carbon-containing double refractorygoldore is realized and remarkable economic benefit is obtained.

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 Applications(China)
IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 杨洪英刘倩佟琳琳
Owner NORTHEASTERN UNIV
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