Method for promoting bacterial leaching of photocatalytic semiconductor sulphide minerals through graphene

A semiconductor and photocatalytic technology, applied in the direction of using microorganisms, bacteria, and adding compounds to stimulate growth, etc., can solve the problem of low utilization rate of photogenerated electrons

Active Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the photocatalytic properties of semiconductor sulfide minerals can be used to promote the microbial leaching of semiconductor sulfide minerals, but photogenerated electrons are easily recombined with photogenerated holes, making the utilization rate of photogenerated electrons low

Method used

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  • Method for promoting bacterial leaching of photocatalytic semiconductor sulphide minerals through graphene
  • Method for promoting bacterial leaching of photocatalytic semiconductor sulphide minerals through graphene
  • Method for promoting bacterial leaching of photocatalytic semiconductor sulphide minerals through graphene

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example 1

[0022] The method described in this embodiment mainly proceeds according to the following steps:

[0023] (1) Crushing the chalcopyrite into a particle size of more than 200 meshes, and using XRD technology to analyze the main components of the minerals, XRF technology to analyze the composition of mineral elements, and the medium is prepared according to the formula of 9K medium;

[0024] (2) Inoculate Thiobacillus acidophilus with 10% inoculum amount into 9K medium containing 1% chalcopyrite for the first acclimatization, count the number of live cells by hemocytometer method regularly every day, when Bacterial concentrations can reach 10 8 -10 9 individual / ml, complete the first domestication, remove the slag, collect the bacteria by centrifugation, repeat the above steps, and carry out domestication in the chalcopyrite slurry containing 2%, until the acidic Thiobacillus ferrochloride can tolerate 2% chalcopyrite pulp concentration;

[0025] (3) The domesticated acidophi...

Embodiment 2

[0031] The method described in this embodiment mainly proceeds according to the following steps:

[0032] (1) Crushing the chalcopyrite into a particle size of more than 200 meshes, and using XRD technology to analyze the main components of the minerals, XRF technology to analyze the composition of mineral elements, and the medium is prepared according to the formula of 9K medium;

[0033] (2) Inoculate Thiobacillus acidophilus with 10% inoculum amount into 9K medium containing 1% chalcopyrite for the first acclimatization, count the number of live cells by hemocytometer method regularly every day, when Bacterial concentrations can reach 10 8 -10 9 individual / ml, complete the first domestication, remove the slag, collect the bacteria by centrifugation, repeat the above steps, and carry out domestication in the chalcopyrite slurry containing 2%, until the acidic Thiobacillus ferrochloride can tolerate 2% chalcopyrite pulp concentration;

[0034] (3) The domesticated acidophi...

Embodiment 3

[0040] The method described in this embodiment mainly proceeds in the following steps:

[0041] (1) Crushing the chalcopyrite into a particle size of more than 200 meshes, and using XRD technology to analyze the main components of the minerals, XRF technology to analyze the composition of mineral elements, and the medium is prepared according to the formula of 9K medium;

[0042] (2) Inoculate Thiobacillus acidophilus with 10% inoculum amount into 9K medium containing 1% chalcopyrite for the first acclimatization, count the number of live cells by hemocytometer method regularly every day, when Bacterial concentrations can reach 10 8 -10 9 individual / ml, complete the first domestication, remove the slag, collect the bacteria by centrifugation, repeat the above steps, and carry out domestication in the chalcopyrite slurry containing 2%, until the acidic Thiobacillus ferrochloride can tolerate 2% chalcopyrite pulp concentration;

[0043] (3) The domesticated acidophilic iron-s...

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Abstract

The invention discloses a method promoting bacterial leaching of photocatalytic semiconductor sulphide minerals through graphene, and belongs to the technical field of biological metallurgy. The technical scheme lies in that graphene has the advantages of good electrical conductivity, large surface area, good light transparency, and the like, can promote transfer of photoinduced electrons and increase the utilization rate of photoinduced electrons, and the leaching rate of the semiconductor sulphide minerals is remarkably increased; acidophilic iron-sulfur oxidizing bacteria leach the semiconductor sulphide minerals under the conditions of addition of 0.2 to 0.3 g / L graphene and illumination; compared with the leaching result obtained under the conditions that the environment is dark and no graphene is added, the leaching result obtained under the conditions that the light intensity is 6000 to 12000 Lux and the 0.2 to 0.3 g / L graphene is added has the advantage that the leaching rate is increased by 28.9% to 49.7%; and compared with the leaching result obtained under the conditions that the light intensity is 6000 to 12000 Lux and no graphene is added, the leaching result obtained under the conditions that the light intensity is 6000 to 12000 Lux and the 0.2 to 0.3 g / L graphene is added has the advantage that the leaching rate is increased by 3.3% to 19.9%. According to the method, the leaching rate of the semiconductor sulphide minerals can be remarkably increased, and the semiconductor sulphide minerals have better comprehensive utilization value.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, and in particular relates to a method for graphene to promote bacterial leaching of photocatalytic semiconductor sulfide minerals. Background technique [0002] my country's mineral resources are very scarce, mainly some lean ore and low-grade minerals, and with the rapid economic development, mineral resources continue to be consumed, leaving a large number of low-grade and difficult-to-handle minerals. Traditional metallurgy has been difficult The valuable metals in these minerals are economically and effectively recycled, but with the rapid economic development, people's demand for mineral resources is increasing, making a large number of researchers focus on improving metallurgical technology to improve the level of smelting. Microbial metallurgy technology has the characteristics of mild reaction conditions, simple equipment, economy and energy saving, and environmental friendliness. Mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00C12N1/38C12N1/20C12N1/36
CPCC12N1/20C12N1/36C12N1/38C22B3/18C22B15/0065Y02P10/20
Inventor 朱建裕杨宝军甘敏宋子博刘学端胡岳华丘冠周
Owner CENT SOUTH UNIV
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