Abstract: Searching for a kind of thermoacidophilic bacterium that can bear high temperature while maintaining strong iron sulfur oxidation ability is of great significance to biological metallurgy. An experimental research was therefore made on screening moderate Thermoacidophilic bacterium from the drainage of a sulfur mine in Mojiang, Yunnan. As a result, one such bacterium suitable for bioleaching of sulfide ore was isolated, which belongs to Sulfobacillus thermosulfidooxidans.It has good oxidation ability for Fe²⁺ ion or element sulfur and can bear a temperature as high as 55 ℃, with the most suitable temperature for its growth being 45 ℃; and can grow in a pH range of 0.5～3.0, with the most suitable pH for its growth being1.5～2.0. Presently, this bacterial strain is preserved in China Center for Type Culture Collection.

Key words: Biometallure, Moderate thermoacidophile, Screening