Low-grade multi-metal sulfide mineral selective bioleaching technology

Abstract

The invention provides a low-grade multi-metal sulfide mineral selective bioleaching technology. The process is as follows: pile building is performed on the raw mineral materials, dilute acid solution is adopted for presoaking, and efficient mineral leaching bacteria are led in for leaching after the acidity of the mineral pile is basically stable; pile unloading is performed when the leaching of nickel reaches more than 80 wt%, then pile building is performed again on the leaching residue, and thermophilic bacteria are led in for leaching; and when the concentration of nickel in the leaching agent is more than 2.0 g / L, open-cycle is performed on the partial leaching agent, sodium sulfide is added into the leaching agent for fractional precipitation, so as to obtain copper sulphide, zinc sulphide and nickel and cobalt sulphide products, after precipitation is completed, lime is added into the leaching agent for neutralization, wherein concentration of iron in the neutralized leaching agent is less than 1.0 g / L, and the neutralized leaching agent can be reused at the leaching stage. According to the invention, technological process is short, equipment is simple, investment conservation and zero contamination are realized, cost is low, recovery rate of valuable metal is improved, the purpose of comprehensively utilizing low-grade multi-metal sulfide mineral resources is realized, and greater economic benefits can be achieved.

Description

technical field [0001] The invention relates to a selective biological leaching process for low-grade polymetallic sulfide ores, in particular to a selective biological leaching process for low-grade copper-nickel-cobalt-zinc polymetallic sulfide ores. Background technique [0002] With the continuous mining of mineral resources, the ore tends to be poor and hybridized gradually, with high content of toxic metal ions and impurity minerals, and a close relationship of polymetallic associations. Among the proven polymetallic mineral resources, the polymetallic ore associated with copper accounts for the majority, and the copper is mainly primary copper sulfide ore, which also contains nickel-cobalt-zinc ore, and the grade is low (generally, the content of copper and zinc less than 1wt%, nickel less than 0.5wt%, cobalt less than 0.2wt%), it cannot be developed and utilized by using the existing smelting technology. Using wet treatment technology, the concentration of iron in t...

AI Technical Summary

Problems solved by technology

Among the proven polymetallic mineral resources, the polymetallic ore associated with copper accounts for the majority, and the copper is mainly primary copper sulfide ore, which also contains nickel-cobalt-zinc ore, and the grade is low (generally, the content of copper and zinc less than 1wt%, nickel less than 0.5wt%, cobalt less than 0.2wt%), cannot be developed and utilized by using existing smelting technology

Images