Mesophilic leaching of copper sulphide sludge

Journal of the Serbian Chemical Society

Cvetkovska Milena V.¹  Conić Vesna T.²  Cvetkovski Vladimir B.²  Vuković Milovan³ 

[1] Hemijski fakultet, Beograd;Institut za bakar, Bor;Tehnički fakultet, Bor;

关键词: copper;    acid solutions;    hydrogen sulphide;    sulphide sludge;    bioleaching;   

DOI  :  10.2298/JSC0902213C

来源: DOAJ

【 摘 要 】

Copper was precipitated using a sodium sulphide solution as the precipitation agent from an acid solution containing 17 g/l copper and 350 g/l sulphuric acid. The particle size of nearly 1 μm in the sulphide sludge sample was detected by optical microscopy. Based on chemical and X-ray diffraction analyses, covellite was detected as the major sulphide mineral. The batch bioleach amenability test was performed at 32°C on the Tk31 mine mesophilic mixed culture using a residence time of 28 days. The dissolution of copper sulphide by direct catalytic leaching of the sulphides with bacteria attached to the particles was found to be worthy, although a small quantity of ferrous ions had to be added to raise the activity of the bacteria and the redox potential of the culture medium. Throughout the 22-day period of the bioleach test, copper recovery based on residue analysis indicated a copper extraction of 95 %, with copper concentration in the bioleach solution of 15 g/l. The slope of the straight line tangential to the exponential part of the extraction curve gave a copper solubilisation rate of 1.1 g/l per day. This suggests that a copper extraction of 95 % for the period of bioleach test of 13.6 days may be attained in a three-stage bioreactor system.

【 授权许可】

Unknown