Technology for extracting indium from indium-rich bottom lead

The invention relates to a technique of extracting indium from indium-rich bottom lead, which comprises steps as follows: firstly, the indium-rich bottom lead is melt down and cast into an anode plate, while a stainless-steel plate or a refined lead plate is used as a cathode, and electrolysis is conducted in a silicofluoric acid system; secondly, lead is electrolyzed out of the anode and into an electrolyte solution, and electrolytic lead is precipitated from the cathode; thirdly, indium is dissolved along with the lead and retained in the electrolyte solution, from which the indium is extracted with P204, and the indium is re-extracted with hydrochloric acid to obtain an indium-rich re-extracting solution, a pH value thereof is regulated and then sponge indium is obtained through aluminum plate replacement, and rude indium is obtained through conventional pressing and flake caustic casting of the sponge indium. The technique can effectively recover the indium while directly obtaining the electrolytic lead p