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A oxidative slagging method
Based on the affinity of indium for oxygen to be greater than lead , indium in crude lead is concentrated in the oxidized dross. For example, if the crude lead containing In 0.4%~1% is melted in the reverberatory furnace, the air is blown into the molten pool when the temperature reaches 820~850 °C, and the indium in the crude lead forms a scum containing In 1%~5% and separated from the lead. Transfer to solution or extraction, or direct replacement, electrolysis to obtain 99.99% indium.
B Chlorination slag method
Peru's Central Mining Company (Centromin Peru SA) and Belgium's Hoboken (MHO) smelt indium-containing scum by high-temperature reduction to obtain Sn-In, chlorination with ZnCl2 and PbCl2, and indium and tin in Sn-In The slag is acid-soluble after grinding, and is replaced by electrolysis to obtain indium. Japan's Rixo Smelting Company will reduce the indium and zinc leaching slag to reduce the volatiles of indium and gallium at 1300 °C, and put it into the rotary kiln and add NaCl and sulfur to fluorinate. The indium is enriched in chlorinated soot and acid-soluble. , replacement, electrolysis of indium.
C 烟化法
The former Soviet Union and Canada used the fuming method to treat indium-containing zinc leaching slag or tin slag, and recovered indium from fumed dust.
D Vacuum distillation
The column distillation of crude zinc containing indium and germanium output of each grade of 0.31% of hard zinc, the zinc vapor using real indium germanium enriched slag to a vacuum of In 0.5% ~ 1.5% and Ge 0.5% ~ 2.5 %, alkaline earth metal chloride by distillation to give germanium, indium recovering chloride from the residue.Metal Spoon mold,Silicone spoon mold,Plastic spoon mold
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