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Method of promoting bioleaching of copper pyrites by adding nonionic surfactant

A non-ionic surface, bioleaching technology, applied in the direction of improving process efficiency, can solve the problems of low leaching rate and slow leaching speed, and achieve the effect of low price, stable performance and weakening passivation effect.

Active Publication Date: 2014-08-20
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the prior art, the present invention provides a method for adding non-ionic surfactants to promote the bioleaching of chalcopyrite, the purpose of which is to add non-ionic surface active agents during the leaching process of chalcopyrite by acidophilic Thiobacillus ferrooxidans at normal temperature Active agent to solve the problems of slow leaching speed and low leaching rate in chalcopyrite bioleaching process

Method used

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  • Method of promoting bioleaching of copper pyrites by adding nonionic surfactant
  • Method of promoting bioleaching of copper pyrites by adding nonionic surfactant
  • Method of promoting bioleaching of copper pyrites by adding nonionic surfactant

Examples

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Effect test

Embodiment 1

[0033] (1) Crushing and grinding the chalcopyrite ore sample to -0.074mm, and then sterilizing it with ultraviolet light, as a leaching sample;

[0034] (2) Thiobacillus ferrooxidans was grown to the logarithmic phase in 9K medium, the culture solution was filtered to remove the alum precipitate, and the bacteria were collected by centrifugation for 15 minutes (10000r / min) as the leaching inoculum.

[0035] (3) Place the leaching sample in the sterilized 9K basic salt solution, the concentration of the leaching sample in the solution is 1g / 100mL, insert Thiobacillus ferrooxidans, and adjust the initial bacterial concentration to 1×10 7 pcs / mL, then add polyethylene glycol, the amount of polyethylene glycol added is 30mg / L, and dilute sulfuric acid is used to adjust the initial pH of leaching to 1.8;

[0036] (4) Under the conditions of 30°C and 150r / min, place the above leachate in an air bath constant temperature oscillator and oscillate for 24 days. Use a hemocytometer to co...

Embodiment 2

[0046] (1) Crushing and grinding the chalcopyrite ore sample to -0.074mm, and then sterilizing it with ultraviolet light, as a leaching sample;

[0047] (2) Thiobacillus ferrooxidans was grown to the logarithmic phase in 9K medium, the culture solution was filtered to remove the alum precipitate, and the bacteria were collected by centrifugation for 15 minutes (10000r / min) as the leaching inoculum.

[0048] (3) Place the leaching sample in the sterilized 9K basic salt solution, the concentration of the leaching sample in the solution is 2g / 100mL, insert Thiobacillus ferrooxidans, and adjust the initial bacterial concentration to 3×10 7 each / mL, then add polyethylene glycol, the amount of polyethylene glycol added is 50mg / L, and dilute sulfuric acid is used to adjust the initial pH of leaching to 2.5;

[0049] (4) Under the conditions of 25°C and 180r / min, place the above leaching solution in an air bath constant temperature oscillator and oscillate for 24 days. Use a hemocytom...

Embodiment 3

[0057] (1) Crushing and grinding the chalcopyrite ore sample to -0.074mm, and then sterilizing it with ultraviolet light, as a leaching sample;

[0058] (2) Thiobacillus ferrooxidans was grown to the logarithmic phase in 9K medium, the culture solution was filtered to remove the alum precipitate, and the bacteria were collected by centrifugation for 15 minutes (10000r / min) as the leaching inoculum.

[0059] (3) Place the leaching sample in the sterilized 9K basic salt solution, the concentration of the leaching sample in the solution is 1g / 100mL, insert Thiobacillus ferrooxidans, and adjust the initial bacterial concentration to 5×10 7 pcs / mL, add 9g / L Fe 2+ , then add polyethylene glycol, the amount of polyethylene glycol added is 90mg / L, and dilute sulfuric acid is used to adjust the initial pH of leaching to 3.0;

[0060] (4) Under the conditions of 35°C and 160r / min, place the above-mentioned leachate in an air bath constant temperature oscillator and oscillate for 18 day...

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Abstract

The invention belongs to the field of hydrometallurgy and particularly relates to a method of promoting bioleaching of copper pyrites by adding a nonionic surfactant. The technical scheme is as follows: the method comprises the following steps: crushing and grinding a copper pyrites sample and sterilizing the sample by ultraviolet light to obtain a product as a leaching sample; putting the leaching sample in a 9L basic salt solution sterilized; inoculating ferrous oxide thiobacillus; then, adding polyethylene glycol, wherein the addition of polyethylene glycol is 30-90mg / L; adjusting the initial leaching pH to 1.8-3.5 by using dilute sulphuric acid; under the condition of 25-35 DEG C and 150-180r / min, oscillating and leaching for 18-25 days; and adding polyethylene glycol to at least increase the leaching ratio of copper pyrites by 1.36 times. The invention provides a novel path for increasing the bioleaching rate of low-grade copper pyrites and is of important meaning to promote large-scale industrial application of a low-grade copper pyrite bioleaching process.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for promoting chalcopyrite bioleaching by adding a nonionic surfactant. Background technique [0002] my country has a large amount of low-grade copper sulfide ore resources, and the estimated storage capacity is more than 12 million tons (metal content). This part of copper sulfide ore is mainly chalcopyrite, but the leaching speed in the chalcopyrite bioleaching process is slow, The "bottleneck" problem of long production cycle has not been effectively resolved so far. On the one hand, whether it is sulfuric acid, ferric sulfate or normal temperature microorganisms leaching chalcopyrite, there is a phenomenon that the leaching rate decreases obviously after a period of leaching, which is the so-called "passivation phenomenon". On the other hand, the concentration and activity of microorganisms in the leaching solution determine With the bioleaching rate, the ...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 魏德洲张瑞洋刘文刚高淑玲沈岩柏卢涛
Owner NORTHEASTERN UNIV
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