Effect of Bioleaching on Alkalinene Copper Oxide Ores with Ammonia Producing Strain

ISSN: 0973-7510

E-ISSN: 2581-690X

Wang Hongjiang^1,2, Wu Aixiang , Xiong Youwei^1,2, Hu Kaijian^1,2 and Huang Mingqing^1,2

¹School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing – 100 83, China.

²State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing,Beijing – 100 083, China.

J Pure Appl Microbiol. 2013;7(Spl. Edn.: April):255-261

Received: 03/03/2013 | Accepted: 14/04/2013 | Published: 30/04/2013

Abstract

There are mass of studies on ammonia leaching of copper, but few concerning bioleaching under alkalinene system. This paper presents an ammonia-producing strain isolated from soil, which is capable of decomposing urea, identified as Providencia.Sp and designated as strain AJT-1. Then bioleaching of high alkalinene copper oxide ores was carried out in the shake flask with Providencia JAT-1. The influencing parameters investigated include liquid-solid ratio, species and concentration of leaching aid and initial bacteria inoculation size. The results show that the 144h bioleaching yields a copper recovery of 42.35%, which is obtained at liquid-solid ratio of 7:1, ammonium sulfate of 0.024mol/L as the leaching aid, and initial bacteria inoculation of 20%. Based on the copper phase test of leaching residue, we can learn that the most easily leached copper dealing with ammonia strains is secondary copper sulfide, and its leaching rate is as high as 84.26%.

Keywords

Ammonia producing strain, Bioleaching, Alkalinene, Copper ore, Initial inoculation size

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