China Nonferrous Metallurgy

In view of the fact that the rhenium leaching rate of the ammonium rhenate recovery system is not high and the product ammonium rhenate grade is low, a copper industry company adopts a small-scale laboratory research method to conduct an experimental study on the improvement of the leaching process of the rich rhenium slag，in which, the original high acid oxidation leaching was changed to a single hydrogen peroxide system oxidation leaching. The results show that the concentration of rhenium in the leaching solution can reach 1988mg/L under the conditions of 400mL/100g slag, reaction time 120min and leaching temperature of 70℃. Compared with the original production process, the leaching rate of rhenium is greatly improved, reaching an average of over 90%. At the same time, the impurity concentrations of bismuth and arsenic decreased from 110~150mg/L and 260~400mg/L to 33.62mg/L and 14.35mg/L, respectively, and the leaching of impurities was significantly reduced.