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Vladimir N Abrjutin

Arkady A Belsky

Ellin Petrovich Bochkarev

Nikolai A Novikov

Raisa V Ivanova

Alexandr V Eljutin

Nina Andreevna Ljubimova

Alexandr V Peredereev

Nadezhda Semenovna Gorbacheva

Igor Vladimirovich Prokopov

Vyacheslav P Ezhkov

Jury G Pukhov

Vladimir V Kozhemyakin

Oleg N Kalashnik

Nail Z Nasyrov

Galina E Masjuk

Svetlana M Baryshnikova

Edige R Khairulin

Mikhail S Zvyagin

Ljubov I Konstantinova

Vyacheslav A Kirichenko

A process for producing high-purity gallium from gallium-arsenic containing wastes resulting from the manufacture of semiconductors which comprises a vacuum-thermal decomposition of said wastes under a residual pressure of from 1.10.sup.-1 to 1.10.sup.-2 mm Hg while elevating temperature to from 25.degree. to 1,150.degree. C. at variable heating rates ranging from 0.5.degree. to 20.degree. C./min. The vacuum-thermal decomposition of the wastes is accompanied by sublimation of arsenic which is condensed. The resulting melt of gallium is cooled to a temperature of from 50.degree. to 100.degree. C. at variable cooling rates ranging from 0.05.degree. to 15.degree. C./min. Then the melt of gallium is filtered at the cooling temperature of the melt. The filtered gallium melt is subjected to a hydrochemical treatment. The melt of gallium having passed the hydrochemical treatment is subjected to a fractional multi-stage crystallization to crystallize gallium in an amount of from 60 to 95% by mass of its initial charge in each stage; the metal residues enriched with impurities are recycled from each subsequent stage to each preceding one.

Process for producing high-purity gallium

According to the invention a process is proposed for purifying low-melting metals from impurities, residing in that a melt of a low-melting metal is treated with an aqueous solution of an inorganic acid or an alkali in the presence of organic compounds with ionogenic groupings. The proposed invention enhances the purity degree of the low-melting metal being purified and at the same time reduces the losses thereof.

Process for purifying low-melting metals from impurities

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Moscow, Russia

Vladimir N Abrjutin