Method for promoting leaching of photocatalysis semiconductor sulfide mineral bacteria by oxalic acid

A semiconductor and photocatalytic technology, applied in the methods of using microorganisms and the improvement of process efficiency, to achieve the effects of improving bacterial leaching efficiency, simple equipment and mild conditions

Active Publication Date: 2016-06-08
CENT SOUTH UNIV
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  • Description
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Problems solved by technology

Studies have found that using the photocatalytic properties of semiconductor sulfide minerals can convert light energy into chemical energy that can be used by non-photosynthetic chemoautotrophs to promote their growth. In addition, it has been reported that oxalic acid can promote photocatalytic degradation of organic matter, but it is currently published The technology of oxalic acid has not studied the leaching of oxalic acid to promote photocatalytic semiconductor sulfide mineral bacteria to improve the efficiency of bioleaching. Therefore, the results of the present invention are more practical and innovative

Method used

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  • Method for promoting leaching of photocatalysis semiconductor sulfide mineral bacteria by oxalic acid
  • Method for promoting leaching of photocatalysis semiconductor sulfide mineral bacteria by oxalic acid
  • Method for promoting leaching of photocatalysis semiconductor sulfide mineral bacteria by oxalic acid

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example 1

[0019] The method described in this embodiment mainly proceeds according to the following steps:

[0020] (1) Inoculate 10% inoculum of Thiobacillus ferrooxidans into 100ml of 250ml shaker flask containing 1% chalcopyrite 9K medium for the first acclimatization, and use hemocytometer regularly every day count the number of living cells, when the bacterial concentration can reach 10 8 -10 9 individual / ml, complete the first domestication, remove the slag, centrifuge and collect the bacteria, add the collected bacteria solution to 2% chalcopyrite slurry for domestication, until acidophilic Thiobacillus ferrooxidans can tolerate 2% Chalcopyrite pulp concentration;

[0021] (2) The domesticated acidophilic Thiobacillus ferrooxidans was cultured in shake flasks in 9K medium containing 2% chalcopyrite, the culture conditions were initial pH 2.0, temperature 30°C, shaker speed 170rpm;

[0022] (3) Filter and centrifuge the acidophilic Thiobacillus ferrooxidans cultivated in step (...

example 2

[0027] The method described in this embodiment mainly proceeds according to the following steps:

[0028] (1) Inoculate 10% inoculum of Thiobacillus ferrooxidans into 100ml of 250ml shaker flask containing 1% chalcopyrite 9K medium for the first acclimatization, and use hemocytometer regularly every day count the number of living cells, when the bacterial concentration can reach 10 9 individual / ml, complete the first domestication, remove the slag, centrifuge and collect the bacteria, add the collected bacteria solution to 2% chalcopyrite slurry for domestication, until acidophilic Thiobacillus ferrooxidans can tolerate 2% Chalcopyrite pulp concentration;

[0029] (2) The domesticated acidophilic Thiobacillus ferrooxidans was cultured in shake flasks in 9K medium containing 2% chalcopyrite, the culture conditions were initial pH 2.0, temperature 30°C, shaker speed 170rpm;

[0030] (3) Filter and centrifuge the acidophilic Thiobacillus ferrooxidans cultivated in step (2), and...

example 3

[0035] The method described in this embodiment mainly proceeds according to the following steps:

[0036] (1) Inoculate 10% inoculum of Thiobacillus ferrooxidans into 100ml of 250ml shaker flask containing 1% chalcopyrite 9K medium for the first acclimatization, and use hemocytometer regularly every day count the number of living cells, when the bacterial concentration can reach 10 9 individual / ml, complete the first domestication, remove the slag, centrifuge and collect the bacteria, add the collected bacteria solution to 2% chalcopyrite slurry for domestication, until acidophilic Thiobacillus ferrooxidans can tolerate 2% Chalcopyrite pulp concentration;

[0037] (2) The domesticated acidophilic Thiobacillus ferrooxidans was cultured in shake flasks in 9K medium containing 2% chalcopyrite, the culture conditions were initial pH 2.0, temperature 30°C, shaker speed 170rpm;

[0038] (3) Filter and centrifuge the acidophilic Thiobacillus ferrooxidans cultivated in step (2), and...

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Abstract

The invention discloses a method for promoting leaching of photocatalysis semiconductor sulfide mineral bacteria by oxalic acid, and belongs to the technical field of biological metallurgy. Semiconductor sulfide minerals are leached out under a light condition when the oxalic acid of 0.01-0.2 g / L is added into acidophilic iron-sulfur oxidizing bacteria. The oxalic acid can be in hole reaction with oxidizing light, the utilization ratio of photo-induced electrons is increased, and therefore the leaching rate of the semiconductor sulfide minerals is obviously increased. The leaching rate of the semiconductor sulfide minerals with the light intensity being 6000-8500 Lux and with oxalic acid of 0.01-0.2 g / L added is increased by 30.4-42.7% comparing with the leaching result of the semiconductor sulfide minerals with the light intensity being 0 Lux and with no oxalic acid added, and is increased by 5.3-15.3% compared with the leaching result of the semiconductor sulfide minerals with the light intensity being 6000-8500 Lux and with no oxalic acid added. The method can improve the photocatalysis efficiency so as to obviously improve the leaching rate of the semiconductor sulfide minerals, the semiconductor sulfide minerals have more comprehensive utilization value, and the method has great significance in achieving the application the semiconductor sulfide minerals as photocatalyst in the bioleaching field.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, and in particular relates to a method for oxalic acid to promote bacterial leaching of photocatalytic semiconductor sulfide minerals. Background technique [0002] my country's mineral resources are not rich, there are more lean ores and less rich ores, and as high-grade minerals are continuously mined, a large number of low-grade, complex and difficult-to-handle minerals are left. Traditional metallurgical processes can no longer be economically and effectively Recovery of valuable metals in these minerals, but with the continuous development of the economy, people's demand for minerals is increasing, making more and more researchers focus on the improvement of mining and metallurgy technology to improve mining level. Microbial metallurgy technology has many advantages such as mild and easy-to-control reaction conditions, economical and energy-saving, simple operation process, and environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00C12N1/36
CPCC12N1/36C22B3/18C22B15/0067Y02P10/20
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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