Primary beneficiation of tantalite using magnetic separation and acid leaching
Primary beneficiation of tantalite using magnetic separation and acid leaching
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磁选酸浸初步选矿钽铁矿
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Nel
中科院分区：
文献类型：
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作者：
M. Nete;F. Koko;T. Theron;W. Purcell;J. Nel
在从莫桑比克Naquissupa地区的两个不同矿山获得的锰钽矿（样品A）和铁钽矿（样品C）样品溶解之前，成功地进行了初级选矿。磁选除去了大部分铁和钛，而H2SO4浸出除去了这些样品中的大部分钍和铀。分析结果表明，磁选法从样品C（铁钽矿）中分别去除率为64.14wt%和72.04wt%， Nb2O5和Ta2O5各去除率为~ 2wt%，而从样品A（锰钽矿）中分别去除率为9.64wt%和8.66wt%， Nb2O5和Ta2O5各去除率为~ 2wt%。在浓硫酸存在下，温度50℃、浸出时间3 h是去除钽铁矿中放射性元素的最适宜浸出条件。在此条件下，样品A的U3O8和ThO2的浸出率分别为64.14wt%和60.77wt%， Nb2O5和Ta2O5的浸出率分别为4.45wt%和0.99wt%。
Primary beneficiation was successfully performed prior to dissolution of manganotantalite (sample A) and ferrotantalite (sample C) samples obtained from two different mines in the Naquissupa area, Mozambique. Magnetic separation removed the majority of iron and titanium, whereas H2SO4 leaching removed a large portion of thorium and uranium in these samples. Analytical results indicated that 64.14wt% and 72.04wt% of the total Fe and Ti, respectively, and ∼2wt% each of Nb2O5 and Ta2O5 were removed from sample C (ferrotantalite) using the magnetic separation method, whereas only 9.64wt% and 8.66wt% of total Fe2O3 and TiO2, respectively, and ∼2wt% each of Nb2O5 and Ta2O5 were removed from sample A (manganotantalite). A temperature of 50°C and a leaching time of 3 h in the presence of concentrated H2SO4 were observed to be the most appropriate leaching conditions for removal of radioactive elements from the tantalite ores. The results obtained for sample A under these conditions indicated that 64.14wt% U3O8 and 60.77wt% ThO2 were leached into the acidic solution, along with 4.45wt% and 0.99wt% of Nb2O5 and Ta2O5, respectively.