低品位氧化锌矿硫酸浸出工艺研究.pdfVIP

223 矿 冶 工 程 Vol. 22 2 2002 9 MINING AND ME ALLURGICAL ENGINEERING September 2002 蓝卓越,胡岳华, 黎维中 ( , 410083) : pH= 2.0, , 97%,13%0.84% , 1. 76t, , ,,95%,3.6%0.6% : ; ;; ; Sulfuric Acid Leaching of Low-grade Zinc Oxide Ore A Study LAN Zhuo-yue, H Yue-hua, LI We-i zhong ( Dep artment of Mineral Engineering fo Central South University , Changsha 410083, H unan , China ) Abstract:Sulfuric acid leaching of low-gradezincoxide ore is studied in this paper. At pH of 2.0 leaching rate of above97% can be achieved only by controlling addition of sulfaric acid( ie. dosage and rate) . At the same time leaching rates of silico and iron can be reduced to 13% and 0.84% or much less, respectively, and the consamption of sulfuric acid is 1. 76 t per ton zinc. Addition of thiobacillus ferrooxidans can enhancethereachingrateof zinc slightly and is favorablefor iron precipita- tion, which can reducethe content of iron in leach solution. Percolation leaching can achieve leaching rates of above 95% Zn, 3.6% Si and 0. 6% Fe, respectively. Key words: low-grade zinc oxide ore; sulfuric acid leaching; leaching rate; bacterial leaching; percolation leaching , , 25%~ 35%, 25% , ( , , , ) ,- , , -, , , ,, , 30%(25%) ,, [ 1] , , ,, 1 , 1. 1 , [ ZnCO ][ Zn Si O 3 4 2 7 [ 1~ 5] ,