Abstract: To study the leaching effect of bacterial on sphalarite, a strain of leaching bacteria　that has high activity on Fe2+ and element sulfur is isolated and used in leaching. At the conditions of a pulp density of 15%, table vibration frequency of 200r/min, temperature of 30℃, inoculation amount of 10% and pH value of 2.0, the zinc leaching rate can be nearly 100 % for 33 d leaching and for sphalarite concentrate at the same conditions, 37.9% for 33d. It indicates that bacteria can promote the leaching of metal zinc in sphalarite ore.

Key words: Microoganism, Thiobacillus ferrooxidans, Shaplarite, Biloleaching