Method of Recovering Indium Oxides From Low Grade Indium Containing Residue

A method for recovering indium oxide from an indium-containing residue, the method comprising:

• (a) preparing an indium-containing residue generated in a wet leaching or solvent extraction process to extract indium (In) contained in indium-tin oxide;
• (b) putting tin into a melting furnace;
• (c) putting the indium-containing residue into the melting furnace, melting the indium-containing residue, and generating fume oxide through a reaction of indium and oxygen in the melting furnace;
• (d) flowing an exhaust gas including the fume oxide into one or more scrubbers, and spraying a scrubber-circulating liquid toward the exhaust gas in the one or more scrubbers;
• (e) collecting indium oxide included in the exhaust gas with the scrubber-circulating liquid through a gas-liquid contact to send to a centrifuge, and performing a first collection of indium oxide through a separation of solid from liquid in the centrifuge;
• (f) flowing the exhaust gas passed through the scrubbers into a bag filter, and performing a second collection of indium oxide included in the exhaust gas in the bag filter;
• and
• (g) flowing the exhaust gas passed through the bag filter into an absorption tower, and removing odors and toxic components in the exhaust gas in the absorption tower filled with an activated carbon.