Method for separating indium from cadmium slag

The invention relates to the technical field of separation of indium, in particular to a method for separating indium from cadmium slag. The specific operation comprises the following steps: washing, acid dissolution, replacement and impurity removal, replacement and electrolysis. Residual indium contained in the cadmium slag is separated from cadmium by using the hydrolysis difference between indium and cadmium; the recovery rate of indium is greater than 98%; the removal rate of cadmium reaches 90%; the method has the characteristics of low production cost, simple technological process and short production cycle; the environmental pollution of the cadmium slag is reduced; the potential safety hazard is reduced; and the method is suitable for popularization and application in wide metallurgical enterprises.