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《Metal Mine》 2006-11
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Research on Leaching of Low Grade Manganese Ore by Thiobacillus Ferrooxidans

Li Zhizhang~(1,3) Xu Xaiojun~(1,2)(1.Kunming University of Technology;2.Qingdao University of Technology;3.Kunming College of Metallurgy)  
The bioreactor for Thiobacillus Ferrooxidans immobilization was built with soft plastic fiber as the filler.After a long-tern adaptation at low pH and high ferrous ion concentration,the immobilized cells needed only three days to oxidize 82.27% of the ferrous ions with an average Fe~(2+) oxidation rate of 0.29 g/(L·h) at an initial pH=6,Fe~(2+) concentration of 25 g/L,temperature of 30 ℃,air intake rate of 0.5 m~3/h and liquid circulation rate of 0.85 L/h.The time needed for the immobilized cells to achieve an oxidation rate of over 80% was four days ahead that for free cells,with the average oxidation rate 2.5 times that of the latter.In the leaching of low grade rhodochrosite ore,at pH of 1.7,temperature of 60 ℃,Fe~(2+) concentration of 20 g/L and pulp density of 10%,the leaching rate could reach 85% after stirring for 3.5 h.
【CateGory Index】: TD951
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