Study on recovery of indium from lead-bearing soot by two-stage mixed acid leaching process
In order to solve the problems of low leaching rate and safety and environmental protection in the current process of indium extraction from lead-bearing soot,a new process of indium recovery from lead-bearing soot by two-stage mixed acid leaching with full-wet process was proposed.The effects of sulfuric acid concentration,liquid-solid ratio,reaction time and different sulfuric acid initial acid concentration on indium leaching rate during lead-bearing soot leaching were studied.The results indicated that the leaching process conditions were as follows:a liquid-solid ratio of 8:1,sulfuric acid concentration of 150 g/L,hydrochloric acid concentration of 40 g/L,reaction temperature of 90℃,and a reaction time of 4 h.The conditions for the two-stage leaching process were as follows:a liquid-solid ratio of 4:1,initial sulfuric acid concentration of 300 g/L,initial hydrochloric acid concentration of 40 g/L,reaction temperature at 90℃ with an indium leaching rate at 81.18%,leaching residue containing indium at 0.25%,and low-acid leaching liquid output meeting the purification process requirements.Following the industrial implementation of the lead-soot two-stage mixed acid leaching process,there is a potential increase in crude indium production by approximately 3.63 tons per year and an associated rise in economic benefits by about 5.5361 million yuan,demonstrating significant potential for widespread application.
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