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Alexandr V Eljutin

Arkady A Belsky

Nikolai A Novikov

Ivan M Kostin

Nikolai S Shmorgunenko

Isaak A Zatulovsky

Raisa V Ivanova

Khoren A Badaliants

Leonid I Finkelshtein

Alexandr V Peredereev

Anna E Danilina

Leonid M Butorin

Arkady I Zazubin

Elena L Shalavina

Tatyana D Ostapenko

Ellin Petrovich Bochkarev

Nikolai Ivanovich Eremin

Askar M Kunaev

Nina Andreevna Ljubimova

Vladimir N Abrjutin

Georgy P Tkachenko

Nadezhda Semenovna Gorbacheva

Mikhail Ivanovich Zaitsev

Igor Vladimirovich Prokopov

Evgeny A Isakov

Teodor G Milberger

Gennady A Romanov

Petr F Minin

Anatolia T Simanova

Ioan V Davydov

Natalya V Tishevetskaya

Garegin A Peikarov

Svetlana M Baryshnikova

Ljubov B Samaryanova

Mikhail S Zvyagin

Nail Z Nasyrov

Gennady A Panasko

Edige R Khairulin

Jury N Evseev

Avgusta I Samoilova

Ljubov I Konstantinova

Valery N Zubkov

Larisa I Sinelnikova

Lidia I Krasinskaya

Alexandr I Konjukov

Evgeny M Steshenko

Elena A Nekrasova

Larisa F Markova

Petr V Fedorin

Konstantin S Nizharadze

Mirra G Mirskaya

Alexei V Frolov

Greogy I Lazarev

Evgeny A Judin

Vladimir V Krasavin

Anatolia I Simanova

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

The starting aluminate-alkaline solutions are subjected to two-stage carbonization with stirring and the production of hydrate of aluminum oxide, a gallium-containing precipitate, and solutions containing caustic and bicarbonate alkali, thereafter the produced gallium-containing precipitate is mixed with a solution containing caustic alkali to achieve a content of gallium in the solution of 0.05 to 1 g/l, the precipitate thus formed is separated and the solution enriched with gallium is mixed with a solution containing bicarbonate alkali, the produced mixture is evaporated to separate compounds of alkali metals, and the evaporated solution is carbonized to produce a solution containing alkali metal salts, and a gallium concentrate from which gallium is produced by transforming it into alkaline solution and subsequently reducing electrochemically. The proposed method makes it possible to extract gallium at a comparatively low cost from solutions in the processing, for example, of nephelines containing it in amounts which do not exceed 0.02 to 0.03 g/l. Owing to the proposed method it has become possible in the processes of concentration of gallium to produce a number of valuable components such as alkali metal salts contained in the starting ore.

Method for extraction of gallium from aluminate-alkaline solutions in

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

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Moscow, Russia

Alexandr V Eljutin