Ore leaching bacteria and selectivity organism extraction process of low grade zinc sulfide ore

A technology of biological leaching and zinc sulfide ore, applied in the direction of microorganisms, improvement of process efficiency, methods based on microorganisms, etc., can solve the problems of increased cost, difficult separation process, waste of resources, etc., and achieve high recovery rate, short process flow, low cost effect

Inactive Publication Date: 2010-06-23
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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AI Technical Summary

Problems solved by technology

However, in the previous sphalerite bioleaching process, iron and zinc were leached into the leach solution at the same time, and a large amount of iron accumulated caused difficulties in the subsequent separation process, increased costs, and wasted resources.

Method used

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  • Ore leaching bacteria and selectivity organism extraction process of low grade zinc sulfide ore
  • Ore leaching bacteria and selectivity organism extraction process of low grade zinc sulfide ore

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Embodiment 1

[0020] The new process is applied to a domestic iron-containing low-grade zinc sulfide ore. The metal minerals in the ore are mainly pyrite, followed by limonite and hematite; the zinc-containing minerals are mainly sphalerite (30-40%). The gangue minerals are mainly quartz, hydromica, and a small amount of clay minerals; there are few carbonate minerals.

[0021] (1) Breeding, domestication, and expanded cultivation of exclusive ore-leaching bacteria:

[0022] The bacterium that the present invention adopts is collected from certain mine acid pit water, in 90ml Leathen culture medium, inoculate 10ml pit water sample, cultivate in constant temperature water bath in shaker, control temperature to be 45 ℃ respectively according to different bacterial species, control shaker speed The redox potential (Eh), pH value and cell density in the liquid phase were regularly measured at 160 rpm. Add 3.0mol / LH dropwise to Thiobacillus ferrooxidans in late logarithmic growth 2 SO 4 , kee...

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Abstract

The invention relates to an ore leaching bacteria and a selectivity organism extraction process of low grade zinc sulfide ore; the name of the ore leaching bacteria is Leptospirillum ferrooxidans Retech-STC-1, which is deposited and preserved in China Center for Type Culture Collection (in Wuhan University), the preservation register number is CCTCC No: M208162, the preservation data is October 17th, 2008; in the process, dilute sulphuric acid solution containing special ore leaching microorganism and Fe3+ is utilized to extract the ferreous zinc sulfide ore, the oxidation-reduction potential is controlled in the extraction process by adjusting pH, dripping intensity, follow system and air permeability, so as to realize selective extraction of the zinc sulfide ore. The process has short process flow, simple equipment, low investment, low cost, no pollution, high recovery rate and adjustable production scale, can process the low grade zinc mineral resource which can not be processed by the traditional refractory process, can enlarge the resource utilization range and improve the comprehensive recovery level of the metal zinc.

Description

technical field [0001] The invention relates to a selective bioleaching process of ore leaching bacteria and low-grade zinc sulfide ore, especially in the case of high iron content, in the bioleaching system, while maintaining a high leaching rate of zinc minerals, it can effectively inhibit iron leaching, reducing the cost of subsequent iron removal. Background technique [0002] The zinc reserves in the form of sphalerite in my country's zinc sulfide ore account for a considerable proportion. For example, the reserves of low-grade zinc sulfide ore in Yunnan Province are more than 8 million tons, and the zinc produced in Huangshaping, Hunan, and Dachang, Guangxi The ore is also a typical sphalerite resource. During the ore-forming process of sphalerite, iron and various elements enter the mineral lattice in the form of isomorphism, especially the substitution of iron for zinc is commonly found in zinc sulfide ore, and it is difficult to remove iron by mechanical grinding an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C22B3/18C12R1/01
CPCY02P10/20
Inventor 武彪温建康刘学武名麟
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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