Method for continuously leaching sulfide ore by using synergy of autotrophic ore leaching bacteria and heterotrophic ore leaching bacteria

Abstract

The invention discloses a method for continuously leaching sulfide ore by using the synergy of autotrophic ore leaching bacteria and heterotrophic ore leaching bacteria, which comprises two main steps of preparing a compound ore leaching strain and leaching ore by using the compound strain. The step of preparing the compound ore leaching strain comprises the steps of selecting a strain, preparing a culture medium, compositely culturing the strain and domesticating the compound ore leaching strain. The step of leaching ore by using the compound strain comprises the steps of pretreating an ore sample, preparing an ore leaching culture medium, leaching the ore by using the compound ore leaching strain, selecting and adding semiconductor sulfide ore and extracting metals in the leaching liquids. In the method, the characteristic of the semiconductor sulfide ore to provide electrons to promote the ore leaching action of microbes in the electron transition process is utilized, so that the operating cost of the whole process is lowered, the ore leaching efficiency of the process is improved, and the method has broad application prospect in the field of metallurgy.

Description

technical field [0001] The invention relates to a method for synergistically and continuously leaching sulfide ore by using autotrophic ore leaching bacteria and heterotrophic ore leaching bacteria, and belongs to the technical field of biological hydrometallurgy in metallurgical processes. Background technique [0002] In recent years, with the decrease of mineral resources, the use of traditional technology to extract useful metals from lean ore, waste ore, and difficult-to-mine, difficult-to-separate, and difficult-to-smelt ores is not only costly, but also does not meet the environmental protection requirements of today's world. Many microorganisms can act on minerals in various ways, converting valuable elements in minerals into ions in solution. Utilizing this property of microorganisms, combined with related processes such as hydrometallurgy, biometallurgy technology has been formed. The technology of using microorganisms to leach useful metals in ores has shown its ...

AI Technical Summary

Problems solved by technology

[0011] Since the leaching effect of a single type of leaching bacteria on minerals only utilizes the effect of the original characteristics of the bacteria on minerals, when the amount of bacteria in the solution reaches a certain amount, the growth of the bacteria reaches a slow period and then enters a decline period. Keep the leaching process in the logarithmic phase with the strongest bacterial activity

Moreover, in the later stage of the bacterial growth cycle, the bacterial secretions may be wrapped on the mineral surface, preventing the bacteria from further leaching the minerals, so that the bacterial leaching ability of the minerals is greatly reduced, and the leaching rate is reduced.