Bioleaching of marmatite using moderately thermophilic bacteria

来源期刊：中南大学学报(英文版)2008年第5期

论文作者：周洪波 刘飞飞 邹颖钦 曾晓希 邱冠周

文章页码：649 - 649

Key words：marmatite; moderate thermophilies; zinc; bioleaching

Abstract: The process of bioleaching marmatite using moderately thermophilic bacteria was studied by comparing marmatite leaching performance of mesophiles and moderate thermophiles and valuating the effect of venting capacity as well as pulp density on marmatite leaching performance of moderate thermophiles. The results show that moderate thermophiles have more advantages over mesophilies in bioleaching marmatite at 45 ℃ and the pulp density of 50 g/L, and the zinc extraction efficiency reaches 93.1% in 20 d. Aeration agitation can improve the transfer of O₂ and CO₂ in solution and promote the growth of bacteria and therefore, enhance the leaching efficiency. Under the venting levels of 50, 200 and 800 mL/min, the zinc extraction efficiencies by moderate thermophiles are 57.8%, 92.5% and 96.0%, respectively. With the increase of pulp density, the total leaching amount of valuable metals increases, however, the extraction efficiency decreases due to many reasons, such as increasing shear force leading to poorly growth condition for bacteria, etc. The zinc extraction decreases remarkably to 58.9% while the pulp density mounts up 20%.

基金信息：the National Natural Science Foundation of China
the Major State Basic Research Development Program of China
the Program for New Century Excellent Talents in University