The possibility and efficiency of leaching nickel, copper and iron from polymetallic sulphide concentrates in ferric chloride solution with cupric and chloride ions addition as well as in sulphuric acid in the presence of dichromate ions has been investigated. The effects of the leaching time, the ferric ion concentration, the dichromate ion concentration and temperature on the metal dissolution were examined. The most promising results were achieved with the leaching in sulphuric acid solution in the presence of dichromate ions. The optimum conditions for the leaching of nickel and copper have been found at temperature 70percent in the solution containing 0.5 M H_2SO_4 and 0.20 M K_2Cr_2O_7. After one hour leaching 98.1percent Ni, 96.3percent Cu and 47.2percent Fe were extracted.
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机译：研究了在重铬酸根离子存在下，在添加了铜和氯离子的氯化铁溶液以及硫酸中从多金属硫化物精矿中浸出镍，铜和铁的可能性和效率。考察了浸出时间，三价铁离子浓度，重铬酸根离子浓度和温度对金属溶解的影响。在重铬酸根离子存在下，在硫酸溶液中浸出可获得最有希望的结果。在含0.5 M H_2SO_4和0.20 M K_2Cr_2O_7的溶液中，发现了浸出镍和铜的最佳条件是温度为70％。一小时后，浸出98.1％的镍，96.3％的铜和47.2％的铁。
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