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Application of ferric phosphate for reinforcement of bacterial leaching out of nickel sulphide ores

A technology of nickel sulfide ore and iron phosphate, applied in the direction of improving process efficiency, etc., can solve the problems of low efficiency of nickel sulfide ore, achieve the effects of promoting bacterial growth and reproduction, strengthening activity and leaching function, and improving nickel leaching rate

Active Publication Date: 2015-04-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the low efficiency of leaching nickel sulfide ore by bacteria at present, the present invention is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: in 250mL Erlenmeyer flask, add 100mL phosphorus-deficient 9K culture medium solution, then add a certain quality of nickel sulfide ore to sterilize, the mass concentration of ore pulp reaches 1%, add the ferric phosphate of 0.2g / L after sterilization, Finally inoculate 10ml of acidophilic Thiobacillus ferrooxidans (A.f bacteria), the number of bacteria after inoculation reaches 10 8 pieces / ml. Incubate in an air bath shaker at a constant temperature of 30°C with a shaker speed of 150r / min. After leaching for 12 days, the leaching rate of nickel is 1.31 times that of no additives, and the leaching rate reaches 74.58%.

Embodiment 2

[0022] Embodiment 2: in 250mL Erlenmeyer flask, add 100mL phosphorus deficient 9K medium solution, then add a certain quality of nickel sulfide ore to sterilize, the mass concentration of ore pulp reaches 1%, add the ferric phosphate of 0.3g / L after sterilization, Finally inoculate 10ml of acidophilic Thiobacillus ferrooxidans (A.f bacteria), the number of bacteria after inoculation reaches 10 8 pieces / ml. Incubate in an air bath shaker at a constant temperature of 30°C with a shaker speed of 150r / min. After leaching for 12 days, the leaching rate of nickel is 1.45 times that of no additives, and the leaching rate reaches 82.55%.

Embodiment 3

[0023] Embodiment 3: in 250mL Erlenmeyer flask, add 100mL phosphorus-deficient 9K culture medium solution, then add a certain quality of nickel sulfide ore to sterilize, the mass concentration of ore pulp reaches 1%, add the ferric phosphate of 0.4g / L after sterilization, Finally inoculate 10ml of acidophilic Thiobacillus ferrooxidans (A.f bacteria), the number of bacteria after inoculation reaches 10 8 pieces / ml. Incubate in an air bath shaker at a constant temperature of 30°C with a shaker speed of 150r / min. After leaching for 12 days, the leaching rate of nickel is 1.68 times that of no additives, and the leaching rate reaches 95.64%.

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PUM

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Abstract

The invention provides an application method of ferric phosphate for reinforcement of bacterial leaching of nickel sulphide ores, wherein the dosage of ferric phosphate is 0.2-0.6g / L; under the action of ferric phosphate, the leaching rate of the bacterial leaching out of the nickel sulphide ores is greatly increased and is more than 95%, and moreover, the oxidation time is greatly shortened; phosphoric acid in ferric phosphate provides the nutritive phosphorus needed by bacteria and reinforces the activity and ore leaching function of the bacteria, and moreover, Fe(III) released from ferric phosphate due to bacterial oxidation and Fe(II) in solution form a high redox couple, thus promoting the oxidative decomposition of the nickel sulphide ores, and Fe(II) and S generated by the decomposition enables the energy of bacterial growth and reproduction to further reinforce the leaching of the nickel sulphide ores, thus promoting the speed of the bacterial leaching out of the nickel sulphide ores, and providing important theoretical and technical guidance for the reinforcement of the bacterial leaching of the nickel sulphide ores.

Description

technical field [0001] The invention belongs to the field of biometallurgy, and relates to an application method of ferric phosphate in strengthening bacterial leaching of nickel sulfide ore, which realizes efficient leaching of nickel sulfide ore by bacteria, thereby creating favorable conditions for nickel extraction from low-grade nickel sulfide ore. Background technique [0002] Nickel is not only a mineral resource that guarantees economic development, but also an important strategic reserve resource. In my country, with the mining of nickel sulfide, the grade of nickel is getting lower and lower, and it is becoming more and more difficult to handle, resulting in a serious shortage of nickel resource supply in my country and a high degree of dependence on foreign countries, which has become a "bottleneck" restricting the development of subsequent related industries. . Low-grade complex nickel sulfide ore is treated by traditional methods, which not only has low recovery...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B23/00
CPCY02P10/20
Inventor 李骞杨永斌姜涛邱冠周赖慧敏徐斌范晓慧李光辉郭宇峰陈许玲张元波
Owner CENT SOUTH UNIV
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