China Nonferrous Metallurgy

The complex high-indium material from a lead smelter is an intermediate product of smelting, and the leaching rate is lowbyusingconventional acid leaching process.In response to this problem, this paper used three processes, such as hydrochloric acid-sulfuric acid mixed leaching, pressurized acid leaching, sulfating roasting-low acid leaching, to test this complex high-indium material. Under the optimal process conditions of each test,the results are as follows. Using the hydrochloric acid-sulfuric acid mixed acid leaching process, the leaching rate of indium can reach 75.87%, and the indium content of the leaching residue can be reduced to 0.32%; using the pressure acid leaching process, the leaching rate of indium can reach 82.54%, and the indium content of the leaching residue can be reduced to 0.21%;using sulfuric acid roasting-low acid leaching process, the leaching rate of indium can reach 93.28%, and the indium content of the leaching residue can be reduced to 0.09%.Though comparison of these three indium leaching processes, the “sulfating roasting-low acid leaching” process is more suitable for extracting indium from this complex indium-containing material.