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A biological gold extraction process and microorganisms used in antimony-containing complex refractory gold ore

A microbiology and gold mining technology, applied in the direction of microbiology, microbiology, process efficiency improvement, etc., can solve the problems of high consumption of sodium cyanide, low gold extraction rate, etc., and achieve high leaching rate, wide temperature range, and simple operation Effect

Inactive Publication Date: 2017-02-01
招金矿业股份有限公司技术中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of the prior art, the present invention provides a bacterial oxidation pretreatment-cyanide gold extraction method of antimony-containing complex refractory gold mines. In this method, the leaching rate of gold reaches more than 90%, which mainly solves the Technical problems of low gold extraction rate and high consumption of sodium cyanide in refractory gold mines

Method used

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  • A biological gold extraction process and microorganisms used in antimony-containing complex refractory gold ore
  • A biological gold extraction process and microorganisms used in antimony-containing complex refractory gold ore
  • A biological gold extraction process and microorganisms used in antimony-containing complex refractory gold ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Isolation and screening of bacterial colonies

[0026] 1. Sample source

[0027] The sample came from the acid pit water of a complex gold mine containing antimony in Hezuo City, Gansu Province.

[0028] 2. Separation and purification of acidithiobacillus ferrooxidans ZJ-ZZG-1

[0029] Take 50mL of raw water and inoculate into 200mL of 9K liquid culture based on a 500ml Erlenmeyer flask, shake and cultivate in a constant temperature shaker at 35°C at 170rpm for 6-10d, use a 0.45μm organic microporous filter to remove the reddish-brown precipitate in the solution, and then Centrifuge the obtained filtrate in a high-speed centrifuge at 10,000 rpm for 20 minutes, collect the milky white precipitate at the bottom, which is the bacterial aggregate, and finally dilute it with deionized water to obtain a bacterial suspension, which is the mixed culture of acidophilic bacteria. The obtained bacterial mixture Continue to enrich for 3 to 4 generations, and then dilute...

Embodiment 2

[0031] Embodiment 2 biological gold extraction process

[0032] 1. Subjects

[0033] A typical antimony complex refractory gold ore, the gold concentrate contains high content of antimony, arsenic and organic carbon, and the gold is disseminated in microscopic or submicroscopic form in pyrite, arsenopyrite and stibnite to form inclusions , The gold concentrate is leached by conventional cyanide, the consumption of sodium cyanide is 47.6kg / t, and the leaching rate of gold is only 21.73%. The chemical analysis of the main elements of the gold concentrate is shown in Table 1 below:

[0034] Table 1 Chemical analysis of main elements of gold concentrate

[0035]

[0036] 2. Experimental methods and results

[0037] In an oxidation tank equipped with a stirring device, inoculate acidithiobacillus ferrooxidans ZJ-ZZG-1 (preservation number CCTCC NO: M2014120) into 9K medium for expanded culture, with an inoculum size of 10% and an air volume of 0.2m 3 / h, the stirring rate was...

Embodiment 3

[0040] Embodiment 3 biological gold extraction process

[0041] 1. Subjects

[0042] A complex refractory gold mine containing antimony. The chemical analysis of the main elements of the gold concentrate is shown in Table 2. The gold concentrate is leached by conventional cyanide, the consumption of sodium cyanide is 33.57kg / t, and the gold leaching rate is 38.92%.

[0043] Table 2 Chemical analysis of main elements of gold concentrate

[0044]

[0045] 2. Experimental methods and results

[0046] Inoculate CCTCC NO: M2014120 bacteria into 9K medium in an oxidation tank equipped with a stirring device for expanded culture, the inoculation amount is 20%, and the aeration amount is 0.4m 3 / h, the stirring rate is 1000 rpm, the culture temperature is 35°C, the pH value of the culture solution is 2.0, and the culture time is 36 hours.

[0047] Add the gold concentrate to the bacterial culture solution to make the slurry concentration 20wt%, inflate and stir with air, and the...

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Abstract

The invention provides a biological gold extraction process of antimony-bearing complex refractory gold ore and a microorganism used in the process. The process comprises the following steps: inoculating bacteria with an accession number of CCTCC NO: M2014120 in a 9K culture medium for culture; adding antimony-bearing complex refractory gold ore into the bacterial culture solution, performing bacterial oxidation pretreatment at 25-55 DEG C and at a pH of 0.6-2.2 while injecting air with an injection rate of 0.1-0.4 m3 / h and stirring at a stirring speed of 600-1000 rmp, performing oxidation for 4-8 days; after bacterial oxidation, performing solid-liquid separation, adding water into bacterial oxidation residues to obtain residue slurry with a pH value being adjusted to 9-11, and adding sodium cyanide for cyaniding at a pH value of 10-11 for 24-48 hours. The process of the invention makes full use of antimony-bearing complex refractory gold ore resources, has a gold leaching rate of up to more than 90%, saves the cost, improves the profit, and is green and environment-friendly.

Description

technical field [0001] The invention relates to a biological gold extraction process of antimony-containing complex refractory gold ore and microorganisms used, and belongs to the technical field of biometallurgy. Background technique [0002] my country is the world's major gold producer and consumer. In my country's gold resource reserves, there are many types of gold mines, most of which are refractory resources. Antimony-containing complex gold ore is a typical extremely difficult-to-leach gold ore. The reason why it is difficult to leach is that the mineral composition of this type of ore is complex, such as pyrite, stibnite, arsenopyrite, realgar, orpiment, carbon During the process of cyanide leaching gold, the stibnite consumes a large amount of oxygen and free cyanide in the leaching solution, and forms a secondary antimony salt film on the surface of the gold particles, which hinders the leaching of gold; at the same time, the ore contains Carbon-containing subst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/00
CPCY02P10/20
Inventor 王彩霞秦洪训马鹏程王效杰张元超王路平丛瑶
Owner 招金矿业股份有限公司技术中心
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