Improved recovery of a low-grade refractory gold ore using flotation–preoxidation–cyanidation methods

查看全文 作　　者：Faraz [1]Soltani;Hossna [1]Darabi;Rezgar [2]Badri;Piroz [3]Zamankhan

机构地区：[1]Mineral Processing Department, Faculty of Engineering, Tarbiat Modares University;[2]Mineral Processing Department, Faculty of Engineering, Tehran University;[3]School of Engineering, University of Kwazulu-Natal, Durban,South Africa

出　　处：《International Journal of Mining Science and Technology》索引2014年第24卷第4期,共6页

摘　　要：In this work, different flotation–preoxidation–cyanidation methods are considered for treating a lowgrade refractory gold ore. On the one hand, the results of selective flotation show that 22% and 31.1%of total Sb and As, respectively, remained in the final tailings and only about 28% of the total Au remained for further cyanidation processes. On the other hand, in bulk method of flotation the maximum Au recovery of 90.6% achieved after 60 min of flotation at the grind size with K80 of 146 micron. In addition, the bulk flotation method resulted in the concentrate with low concentrations of Sb and As elements. To improve the recovery of low-grade refractory gold ores, flotation should be followed by roasting, biological, or pressure oxidation processes so that the gold could be liberated prior to cyanidation processes. It is also found that the pressure oxidation pre-treatment of the concentrates prior to cyanidation may yield high gold recoveries of over than 83%. In these processes, recoveries are controlled by the temperature and the oxygen partial pressure in the solvent. However, by utilizing the bio-oxidation technique, the oxidation of sulfur to sulfate cannot be completed and, consequently, the gold recovery may be limited to only 72.2%. 关键词：难处理金矿石浮选方法氰化方法低品位预氧化金回收率生物氧化技术氧化预处理

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Improved recovery of a low-grade refractory gold ore using flotation–preoxidation–cyanidation methods

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