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Method for enhancing leaching of copper pyrites based on microbial growth and chemical regulation and control

A chemical regulation and bioleaching technology, applied in the biological field, can solve the problems of difficulty in realizing economic value, long leaching cycle, and low chalcopyrite, and achieve the effects of improving the bioleaching process, increasing the leaching efficiency, and low equipment requirements.

Active Publication Date: 2018-03-13
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking copper as an example, chalcopyrite with the most abundant reserves is usually low, and the high cost of conventional high-temperature smelting makes it difficult to realize its economic value
However, its composition is complex, its crystal structure is dense, and there are also problems such as long leaching cycle and low efficiency in the bioleaching process. Therefore, it is imperative to develop a new process to improve the leaching efficiency of chalcopyrite.

Method used

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  • Method for enhancing leaching of copper pyrites based on microbial growth and chemical regulation and control
  • Method for enhancing leaching of copper pyrites based on microbial growth and chemical regulation and control
  • Method for enhancing leaching of copper pyrites based on microbial growth and chemical regulation and control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 The addition of different ferrous and ferric ions in the middle stage of leaching enhances the leaching of chalcopyrite

[0027]The chalcopyrite compound culture medium includes two parts, the first part: mixing 500ml 9K basal medium and 500ml Starkey basal medium; the second part is 2% (w / v) chalcopyrite-depleted. The ore samples were taken from the Tonglingshan mining area in Anhui Province. After preliminary crushing and filtration with steel sieves, the ore particle size is about <48μm. The first part is sterilized at 121°C for 20 minutes by autoclaving. Adjust the pH to 2.0 after sterile mixing. The leaching conditions were as follows: a temperature of 30° C., a shaker rotation speed of 170 rpm, and leaching for 40 days. The cells of Thiobacillus ferrooxidans and Thiobacillus thiooxidans purely cultured in 9K medium and Starkey basal medium were collected. Cultivate to the end of the logarithmic phase, and use low-speed centrifugation (2000r / min) to re...

Embodiment 2

[0031] Example 2 Different pH and exogenous elemental sulfur in the middle stage of leaching regulate the leaching of chalcopyrite

[0032] Strong acid control is generally considered an effective strategy to redissolve jarosite precipitates and release activated iron ions. In the mixed leaching system containing both iron-oxidizing bacteria and sulfur-oxidizing bacteria, strong acid control alone increases the proportion of sulfur-oxidizing bacteria that are more adaptable to strong acids, and cannot provide enough nutrients in time to meet their rapidly rising demand. need. Therefore, it is also necessary to consider adding an appropriate amount of exogenous elemental sulfur as an energy substrate, as shown in Table 2. The iron ion concentrations of pH-stat 0.7, pH-stat0.7+1g / L S, pH-stat 0.7+2g / L systems were significantly increased to 0.89, 1.02 and 0.75g / L, respectively, indicating that jarosite precipitated at a certain dissolved to a certain extent. With the addition...

Embodiment 3

[0035] Example 3 Microbial community structure regulation and enhancement of chalcopyrite leaching

[0036] The use of direct exogenous intervention in microbial community structure is another method to reduce the severity of stress in the middle and late stages of chalcopyrite bioleaching. Since increasing the proportion of Thiobacillus with higher sulfur utilization efficiency can make more use of the accumulated sulfur film on the mineral surface, and contribute acidity to inhibit the formation of jarosite, three schemes were adopted to regulate the microbial community structure, pure sulfur-oxidizing bacteria The proportion of the mixed bacteria was regulated by supplementing the mixed cells of different kinds of cells, sulfur-oxidizing bacteria and iron-oxidizing bacteria. Iron ions increased to 0.89, 0.92 and 0.83g / L, and sulfate ions increased from 3.15g / L in the control system to 3.87, 3.65 and 3.76g / L. The final biomass reached 3.08×10 8 , 3.51×10 8 and 3.43×10 8 ...

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Abstract

The invention discloses a method for enhancing leaching of copper pyrites based on microbial growth and chemical regulation and control and belongs to the biology technical field. The method comprisesthe steps that purely cultured iron oxide bacterial and sulfur oxide bacterial cells are inoculated into a copper pyrite composite culture medium, bioleaching of the copper pyrites is conducted, a proper quantity of ferrous and ferric ions are supplemented in the medium term of leaching, ferrooxidant deficiency caused by generation of jarosite is avoided by supplementing, and energy substrates are supplemented for iron oxide bacterial cells; at the same time, the constant pH value is adjusted, a proper amount of elemental sulfur is supplemented, the acidity is enhanced while the sulfur metabolism is improved, and generation of the jarosite is restrained; the iron oxide bacterial and sulfur oxide bacterial cells collected in the pure culturing process are added gradually by a proper proportion, the microbial growth is improved in the microbial leaching process, the microbial community structure and the metabolic activity of iron and sulfur are optimized, and thus the leaching microenvironment is improved. The method is easy to operate, low in requirement for equipment and suitable for being applied and popularized on a large scale in the similar biological leaching process.

Description

technical field [0001] The invention relates to a method for enhancing chalcopyrite leaching based on microbial growth and chemical regulation, and belongs to the field of biotechnology. Background technique [0002] Compared with traditional high-temperature smelting methods, bioleaching of metal ions in low-grade minerals has the advantages of less infrastructure investment, simple operation, and low operating costs, and has become a green technology for refining waste ore metal resources. Taking copper as an example, chalcopyrite with the most abundant reserves is usually low, and the high cost of conventional high-temperature smelting makes it difficult to realize its economic value. However, its composition is complex, its crystal structure is dense, and there are also problems such as long leaching cycle and low efficiency in the bioleaching process. Therefore, it is imperative to develop a new process to improve the leaching efficiency of chalcopyrite. [0003] Biole...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0065Y02P10/20
Inventor 冯守帅杨海麟黄壮壮尹宗伟吕楚君周锦
Owner JIANGNAN UNIV
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