Low-grade multi-metal sulfide mineral selective bioleaching technology

A bioleaching and selective technology, applied in the direction of improving process efficiency, can solve the problems of low grade and inability to develop and utilize, and achieve the effects of low product impurity content, high product added value, and low comprehensive recovery rate

Active Publication Date: 2013-07-03
有研资源环境技术研究院(北京)有限公司
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  • Abstract
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Problems solved by technology

Among the proven polymetallic mineral resources, the polymetallic ore associated with copper accounts for the majority, and the copper is mainly primary copper sulfide ore, which also contains nickel-cobalt...

Method used

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  • Low-grade multi-metal sulfide mineral selective bioleaching technology
  • Low-grade multi-metal sulfide mineral selective bioleaching technology
  • Low-grade multi-metal sulfide mineral selective bioleaching technology

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Embodiment 1

[0037] The Baishan nickel-cobalt mine in Jilin Province in China is a polymetallic sulfide ore containing valuable metals such as nickel, cobalt, zinc, and copper. The iron content is relatively high, and most of them exist in the form of pyrite. The traditional dressing and smelting technology has high economic costs. No recycling value. The main element analysis is shown in Table 1:

[0038] Table 1 Analysis of main elements of ore

[0039] element Ni co Zn Fe Cu content / % 0.24 0.04 0.45 11.22 0.18 element / % S Ca Mg SiO 2 content 7.24 5.38 6.45 56.64

[0040] The ore contains a large amount of quartz and silicate, zinc exists in the form of sphalerite, copper exists in the form of chalcopyrite, cobalt and nickel mainly exist in pentlandite and pyrite, iron mainly exists in pyrite and magnetite. Exists in the pyrite form.

[0041] (1) Laying at the bottom of the heap: at least one leachate di...

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Abstract

The invention provides a low-grade multi-metal sulfide mineral selective bioleaching technology. The process is as follows: pile building is performed on the raw mineral materials, dilute acid solution is adopted for presoaking, and efficient mineral leaching bacteria are led in for leaching after the acidity of the mineral pile is basically stable; pile unloading is performed when the leaching of nickel reaches more than 80 wt%, then pile building is performed again on the leaching residue, and thermophilic bacteria are led in for leaching; and when the concentration of nickel in the leaching agent is more than 2.0 g/L, open-cycle is performed on the partial leaching agent, sodium sulfide is added into the leaching agent for fractional precipitation, so as to obtain copper sulphide, zinc sulphide and nickel and cobalt sulphide products, after precipitation is completed, lime is added into the leaching agent for neutralization, wherein concentration of iron in the neutralized leaching agent is less than 1.0 g/L, and the neutralized leaching agent can be reused at the leaching stage. According to the invention, technological process is short, equipment is simple, investment conservation and zero contamination are realized, cost is low, recovery rate of valuable metal is improved, the purpose of comprehensively utilizing low-grade multi-metal sulfide mineral resources is realized, and greater economic benefits can be achieved.

Description

technical field [0001] The invention relates to a selective biological leaching process for low-grade polymetallic sulfide ores, in particular to a selective biological leaching process for low-grade copper-nickel-cobalt-zinc polymetallic sulfide ores. Background technique [0002] With the continuous mining of mineral resources, the ore tends to be poor and hybridized gradually, with high content of toxic metal ions and impurity minerals, and a close relationship of polymetallic associations. Among the proven polymetallic mineral resources, the polymetallic ore associated with copper accounts for the majority, and the copper is mainly primary copper sulfide ore, which also contains nickel-cobalt-zinc ore, and the grade is low (generally, the content of copper and zinc less than 1wt%, nickel less than 0.5wt%, cobalt less than 0.2wt%), it cannot be developed and utilized by using the existing smelting technology. Using wet treatment technology, the concentration of iron in t...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B23/00C22B15/00C22B19/00
CPCY02P10/20
Inventor 武彪温建康姚国成刘学陈勃伟
Owner 有研资源环境技术研究院(北京)有限公司
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