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Arkady A Belsky

Nikolai A Novikov

Raisa V Ivanova

Alexandr V Eljutin

Nina Andreevna Ljubimova

Alexandr V Peredereev

Vladimir N Abrjutin

Ivan M Kostin

Ellin Petrovich Bochkarev

Nikolai S Shmorgunenko

Isaak A Zatulovsky

Khoren A Badaliants

Askar M Kunaev

Leonid I Finkelshtein

Tatyana D Ostapenko

Anna E Danilina

Elena L Shalavina

Leonid M Butorin

Evgeny A Isakov

Georgy P Tkachenko

Arkady I Zazubin

Igor Vladimirovich Prokopov

Nadezhda Semenovna Gorbacheva

Mikhail S Zvyagin

Ljubov I Konstantinova

Lidia I Krasinskaya

Ljudmila Nikolaevna Nikitina

Alexandr I Konjukov

Elena A Nekrasova

Edige R Khairulin

Konstantin S Nizharadze

Valery N Zubkov

Mirra G Mirskaya

Alexei V Frolov

Vyacheslav A Kirichenko

Oleg N Kalashnik

Teodor G Milberger

Vyacheslav P Ezhkov

Larisa F Markova

Evgeny A Judin

Petr F Minin

Vladimir V Kozhemyakin

Gennady A Romanov

Galina E Masjuk

Jury G Pukhov

Anna Evgenievna Dotsenko

Garegin A Peikarov

Anatolia T Simanova

Natalya V Tishevetskaya

Nina Nikolaevna Alexeeva

Nail Z Nasyrov

Svetlana M Baryshnikova

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

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.

Process for producing high-purity indium

A process for recovering gallium from alkali aluminate solutions which consists in that the starting alkali aluminate solution is neutralized to a concentration of the caustic alkali of from 0.1 to 10 g/l, whereafter the neutralized liquor is evaporated to a concentration of the caustic alkali therein of from 30 to 150 g/l. Then the evaporated solution is corrected to obtain the ratio between the alkali metal oxide and alumina of above 2.0. The corrected solution is treated with a liquid alloy of gallium containing an element possessing an oxidizing potential exceeding that of gallium to give a concentrate containing more than 90% of gallium by mass, wherafter gallium of a higher purity grade is recovered from the resulting concentrate by the electrochemical method. The process according to the present invention makes it possible to recover gallium from alkali solutions resulting from the treatment of nephelines with the production of a 90% gallium concentrate, wherefrom gallium of an increased purity is obtained at relatively low cost. Processing of the concentrate with the production of gallium is simple, it is not encountered with any additional expenses and requires no additional equipment. Another advantage of the process resides in a more comprehensive utilization of low-grade aluminum-containing ores.

Process for recovering gallium from alkali aluminate solutions resulting

A process for the extraction of gallium from alkaline gallium-containing solutions comprises electrochemically reducing gallium on liquid metal materials in an alternating electromagnetic field.

Process for extraction of gallium from alkaline gallium-containing

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Moscow, Russia

Arkady A Belsky