Method for leaching vanadium out of vanadium-bearing shale through acidithiobacillus ferrooxidans

Abstract

The invention relates to a method for leaching vanadium out of vanadium-bearing shale through acidithiobacillus ferrooxidans. According to the technical scheme, the method comprises the sequential steps of pretreatment of the vanadium-bearing shale; preparation of a domestication culture medium; preparation of a mineral leaching culture medium; strain domestication; and microbiological leaching ofthe vanadium. By means of the method, the ferrous adding amount in a 9K culture medium is reduced, and powdered sulfur is supplemented as an energy substance for bacteria; the acid production capacity of the acidithiobacillus ferrooxidans is increased, and meanwhile, iron hydrolytic precipitation occurring in the leaching process is reduced; the adverse effect of iron precipitation on the vanadium leaching process is reduced, and thus the leaching rate of the vanadium is increased; the concentration of iron ions in leachate is reduced; and subsequent vanadium purification and enrichment can be conducted conveniently.

Description

technical field [0001] The invention belongs to the technical field of leaching vanadium from vanadium-containing shale. Specifically relates to a method for leaching vanadium from vanadium-bearing shale by using Thiobacillus ferrooxidans. Background technique [0002] Vanadium is an important strategic resource, widely used in iron and steel metallurgy, chemical industry, new energy and other fields. Vanadium-bearing shale is widely distributed in my country and has huge reserves. It is an important raw material for vanadium extraction. However, the grade of vanadium in vanadium-bearing shale is generally low. Although the traditional chemical leaching method can extract vanadium from shale to a higher The vanadium leaching rate is high, but there are still disadvantages such as large energy consumption and high cost. [0003] Microbial metallurgy technology is a low-cost, environmentally friendly, and efficient technology for processing mineral resources. It mainly uses t...

AI Technical Summary

Problems solved by technology

[0006] Liao Meixia (Liao Meixia. Microbial leaching process of vanadium in vanadium-containing stone coal [D]. Hunan: Xiangtan University, 2015.) used Thiobacillus ferrooxidans to leach vanadium in stone coal, and additional sulfuric acid was added to the leaching medium As the energy source of bacteria, ferrous iron was leached for 25 days under the conditions of pulp concentration of 3%, leaching temperature of 30°C, initial pH of 2.0, and oscillation speed of 150r / min. The leaching rate of vanadium was 67.8%. A large amount of iron vitriol is precipitated, and the iron concentration in the leaching solution is still high after leaching, which is not conducive to subsequent treatment

[0007] In summary, adding ferrous sulfate as an energy source for Thiobacillus ferrooxidans can promote the growth of the bacteria, but the iron precipitate formed during the leaching process will wrap the minerals and hinder the leaching, and the high concentration of iron ions in the leachate will not Conducive to the purification and enrichment of vanadium