Recent advances in the application of microbial technology in mineral processing

The application of microorganisms to complex ore processing is one of the important research directions in the field of mineral processing. For some low-grade complex ores that cannot be treated by conventional mineral separation methods or cannot obtain economic benefits, microbial treatment technology often cannot. Has an irreplaceable advantage. In 2009, the microbial treatment technology of complex mineral resources obtained rich research results in research methods and applications.

Wang Xuegang and other low-grade uranium ore in a mine carried out experimental research on bacterial leaching and recovery of uranium. Microorganism used is enriched uranium ore from the mine sample separation, purification, acclimation mutagenesis ferrous oxide and Thiobacillus thiooxidans Hengkun engagement bacteria; test results show that mixing has strong activity, It has the advantages of good adaptability, high salinity resistance, strong fluorine resistance, etc. It can grow rapidly under the condition of PH=1.2, and can even grow slowly under the condition of PH=0.6; for low grade uranium ore with uranium grade of 0.0245% After 70 days of microbial leaching, 60% of the uranium can be extracted, and the acid consumption is less than 4%.

Yang Mingxia et al. isolated and enriched acidophilic acid from the acid mine water of a sandstone -type uranium mine in northern China. Through the adaptive domestication and cultivation of the system, an excellent leaching strain with high activity and environmental adaptability was obtained. The results of the leaching test show that the microorganism has the ability to utilize pyrite, and the higher the content of pyrite in the ore, the higher the utilization rate and the more acid production, so the process of acid leaching uranium is super To reduce the effect of acid consumption.

Lin Lifang et al. compared the bacterial leaching and acid leaching of a sandstone uranium mine. Under the same experimental conditions, bacterial leaching was superior to acid leaching in terms of leaching rate, leaching period and acid consumption. The bacterial leaching method was not only It can reduce acid consumption, and it is also difficult to leach uranium by leaching acid method and increase the leaching rate of uranium in ore. For extremely depleted uranium ore with a grade of only 0.02%, more than 83% leaching rate is obtained by bacterial leaching. Such leaching specifications are difficult to achieve with any other treatment method.

A fluorine-containing ores for inhibiting fluorine present in the leaching process and the growth of Thiobacillus acidogenicity case, the glow gold Liu Thiobacillus a series of tests Fluoride tolerance study acclimation. The results showed that fluoride ion is the main factor to inhibit the growth of Thiobacillus thiooxidans. Fluoride ion has a great influence on the acid production capacity of Thiobacillus thiooxidans, and the higher the fluoride ion concentration, the more the effect on the acid production capacity of Thiobacillus thiooxidans. Large, through fluoride tolerance domestication increased the fluoride tolerance of Thiobacillus, enabling it to survive in a high fluorine environment, avoiding the adverse effects of fluoride dissolution in the ore into the solution on the activity of Thiobacillus thiooxidans.

Luoli Qun et Hunan a phosphorus-containing iron ore refractory experimental study dephosphorization Thiobacillus ferrous oxide. Found, acid mine water from copper ore Daye Af bacteria, after acclimation culture for treating a phosphorus-containing refractory ore dephosphorization process is feasible; under appropriate leaching conditions, the iron ore by The leaching rate of phosphorus is up to 61.47%. In addition, the existence of different phosphorus sources has different effects on the phosphorus-consuming metabolic process of the strains. Multiple regressions are established for the three leaching factors of pulp concentration, initial ferrous iron concentration and microbial inoculum. The analysis showed that the three factors had significant effects on the microbial leaching rate, and within the experimental range, the dephosphorization rate was negatively correlated with the pulp concentration and initial ferrous iron concentration, and positively correlated with the microbial inoculum.

Li Guangyue et al. studied the acid and fluoride-resistant UV mutagenesis of Thiobacillus ferrooxidans. Using Thiobacillus ferrooxidans as the starting bacteria, the effects of different mutagenic time on the acid and fluoride resistance of Thiobacillus ferrooxidans were investigated by UV mutagenesis. The results showed that the strain was resistant to acid by UV irradiation of 45-60 mln. The acceptability can be enhanced to pH = 1.2 and the tolerance to fluoride ions can reach 0.6 g / L.

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