US 4,287,030 A · Process for producing high-purity indium

Process for producing high-purity indium

OwnerArkady A. Belsky, Alexandr V. Eljutin +9inventors

InventorsArkady A. Belsky, Alexandr V. Eljutin, Valery N. Zubkov, Alexandr I. Konjukov, Lidia I. Krasinskaya, Elena A. Nekrasova, Konstantin S. Nizharadze, Larisa F. Markova, Mirra G. Mirskaya, Alexei V. Frolov, Evgeny A. Judin

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Abstract

A process for producing high-purity indium which comprises vacuum melting of the metal in two stages: in the first stage at a temperature of from 850.degree. to 940.degree. C. for 1-5 hours; in the second stage at a temperature of from 950.degree. to 1,100.degree. C. for 0.5-2 hours. Thereafter, the metal is subjected to an electrochemical refinement in a hydrochloric acid solution, while the residue of indium evolved on the cathode is remelted by introducing into molten indium at a temperature of from 160.degree. to 400.degree. C.

Claims2

Dependent claims

A process for producing high-purity indium comprising vacuum melting of the metal in two stages:

in the first stage at a temperature ranging from 850.degree. to 940.degree. C. for a period of from 1 to 5 hours;
in the second stage at a temperature ranging from 950.degree. to 1,100.degree. C. for 0.5-2 hours, followed by electrochemically refining the metal in a hydrochloric acid solution and remelting of the residue of indium evolved on the cathode by introducing into molten indium at a temperature of from 160.degree. to 400.degree. C.

Dependencies are inferred from the claim text.