Under heating, metal indium or In2O3 is dissolved in a large excess of dilute sulfuric acid and concentrated at 50 ° C to precipitate crystals of In 2 (SO 4 ) 3 · H 2 SO 4 · 7H 2 O.
The crystals were suction filtered using a glass sand core funnel, washed with glacial acetic acid and dried. The obtained acid salt is heated until no more sulfuric acid is volatilized (about 450 hours at 450 ° C) to form anhydrous indium sulfate.

1.It is also possible to first prepare an indium sulfate solution, concentrate the solution and crystallize the orthorhombic crystal of In2(SO4)3·5H2O therefrom.

2.This crystallization was heated at a temperature of about 500 ° C for 6 hours to decompose to form anhydrous indium sulfate.

3.For the preparation of indium plating solution.

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