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Selective bioleaching process of high-iron and low-grade nickel sulfide ore

A technology of biological leaching and nickel sulfide ore, applied in the direction of improving process efficiency, etc., can solve the problem of high recovery cost of valuable metals, achieve high added value of products, reduce iron removal costs, and reduce treatment costs

Active Publication Date: 2020-12-08
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned technologies, and provide a selective bioleaching process for high-iron and low-grade sulfide ores, which can effectively suppress the growth of dominant species, potential, temperature and other process parameters in the leaching process. Dissolving to achieve selective leaching of nickel-containing minerals to solve the problem of high recovery costs of valuable metals

Method used

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  • Selective bioleaching process of high-iron and low-grade nickel sulfide ore
  • Selective bioleaching process of high-iron and low-grade nickel sulfide ore
  • Selective bioleaching process of high-iron and low-grade nickel sulfide ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A domestic company in Jilin flotation nickel concentrate, the iron content is relatively high, and most of them exist in the form of pyrrhotite and pyrite, the main element analysis is shown in Table 1:

[0052] Table 1 Analysis of main elements of ore

[0053]

[0054]

[0055] The ore contains a large amount of quartz and silicate, nickel exists in the form of nickel sulfide and pentlandite, and iron mainly exists in the form of pyrite and pyrrhotite.

[0056] condition:

[0057] The pulp concentration is 18%, the pH value is 1.2, the inoculation amount of the exclusive sulfur oxidizing bacteria Sulfolobus metallicus Retech-ETC-1 is 10%, the shaking table speed is 200r / min, the temperature is 45°C, and the leaching cycle is 12d.

[0058] The results are shown in Table 2:

[0059] Table 2 Leaching results

[0060] nickel iron sulfur Leaching rate / wt% 86.78 15.68 46.24

[0061] According to the above conditions, the leaching rate of...

Embodiment 2

[0063] A domestic company in Gansu flotation nickel concentrate, the iron content is relatively high, and most of them exist in the form of pyrrhotite and pyrite, the main element analysis is shown in Table 3:

[0064] Table 3 Analysis of main elements of ore

[0065] element Ni co Zn Fe Cu content / % 4.72 0.18 0.13 32.43 0.18 element / % S Ca Mg SiO 2

other content 16.85 2.34 7.89 34.15 1.13

[0066] The ore contains a large amount of quartz and silicate, nickel exists in the form of nickel sulfide and pentlandite, and iron mainly exists in the form of pyrite and pyrrhotite.

[0067] condition:

[0068] The pulp concentration is 18%, the pH value is 1.2, the inoculation amount of bacteria Sulfolobus metallicus Retech-ETC-1 is 10%, the shaking table speed is 200r / min, the temperature is 40-45°C, and the leaching cycle is 12d.

[0069] The results are shown in Table 4:

[0070] Table 4 Leaching Results

[0071] ...

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Abstract

The invention provides a high-iron low-grade nickel sulfide ore selective biological leaching process. The process comprises the following steps of stirring and leaching, selective leaching, deironing, extraction, reverse extraction and electrodeposition, then obtaining a cathode nickel. According to the process, in particular with respect to a flotation nickel sulfide ore concentrate with high iron content and low nickel grade, a stirring biological leaching process is adopted, measures for controlling growth, pH value, temperature and ventilatory capacity of vulcanized bacteria are adopted,redox potential in the leaching process is controlled, dissolution of iron-containing sulfide minerals such as pyrite is effectively inhibited, and selective leaching of the nickel-containing sulfidemineral is realized. The process is short in procedure, simple in equipment, saving in investment, low in cost, free of pollution, high in valuable metal recovery rate and capable of treating low-grade nickel sulfide ore resources which cannot be treated by a pyrogenic process smelting process, utilization range of resources can be expanded, comprehensive recovery level of the nickel metal is improved, and economic benefits, social benefits and environmental benefits of the process is remarkable.

Description

technical field [0001] The invention belongs to the field of biometallurgy of nonferrous metals, and relates to a selective bioleaching process of nickel sulfide ore, in particular to a biostirring leaching process of flotation nickel sulfide concentrate with high iron content and low nickel grade. 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. In nature, nickel mainly exists in the form of compounds, and 1 / 2 to 2 / 3 occurs in sulfide minerals in the form of isomorphism. Among them, nickel sulfide ore mainly includes nickel pyrrhotite, chalcopyrite, sulfur nickel diamond ore and sulfur diamond iron ore, etc. my country's nickel ore is dominated by copper nickel sulfide ore, accounting for 86% of the country's total reserves. However, as the grade of nickel resources continues to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B3/08C22B3/44C22B3/38C22B23/00
CPCY02P10/20
Inventor 武彪尚鹤刘学温建康
Owner 有研资源环境技术研究院(北京)有限公司
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