Other

Boris Alexandrovich Stolyar

Gakif Zakirovich Nasyrov

Nikolai A Kaluzhsky

Nikolai Ivanovich Eremin

Vladimir Nikolaevich Kostin

Dinam Latypovich Nasyrov

Garry Vladimirovich Telyatnikov

Ivan Terentievich Yamin

Ljudmila Nikolaevna Abramova

Viktor Prokhorovich Lyakhov

Vladimir Ivanovich Tarasov

German Abramovich Kaim

Faitel Markovich Rubinchik

Vladimir Ivanovich Lagno

Savely Mikhailovich Milrud

Vladislav Mikhailovich Denisov

Alexandr Vladimirovich Bogdanov

Vitaly Mikhailovich Averin

Muzafar Suleiman-ogly Tagiev

A plant, comprising apparatus for sequential fluidized bed roasting, reducing and cooling of powdered alunite, mounted on a support and communicating with devices for supplying gas into each apparatus and with cyclones for trapping powdered alunite from flue gases and returning it into said apparatus. According to the invention, built-in the plant in front of the apparatus for roasting alunite, is a shaft heat exchanger having at least one throat subdividing its interior in height into a top and bottom chamber with the ratio of the passage cross-sectional areas of the wide and narrow parts falling within a range of from 2 to 12. The top chamber of the shaft heat exchanger communicates with a cyclone heat exchanger via a supply pipe to which is connected an initial alunite feeder and a cyclone, the bottom chamber of the shaft heat exchanger being in communication with a means for producing flue gases and a pipe discharging gas from the apparatus for reducing alunite though a cyclone. The plant may comprise the second heat exchanger built-in intermediate of the apparatus for roasting and that for reducing alunite. As compared with the known similar plants, the plant, according to the invention, provides for the production of alunite featuring a higher quality and at much lower expenditures.

Plant for fluidized bed heat treatment of powdered alunite

A method for processing alunite consisting in that alunite ore is treated with a solution of caustic alkalis at a maximum temperature of 60.degree.C, and a solid residue resulting from the above operation and containing largely potassium and sodium sulphates, is washed with hot water. As a result, potassium and sodium sulphates are dissolved in the wash water, and potassium sulphate is isolated by the action of a caustic-potash solution. The method enables losses of alkalis and aluminium during processing alunite ores containing active forms of silicon compounds to be much reduced, which compound when treating alunite ores with a solution of caustic alkalis, are liable to form insoluble aluminosilicates which are discarded into slime and thus lost together therewith when the latter is separated from the process solution.

Method of producing alumina and potassium sulphate from alunite

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Kirovabad, undefined

Boris Alexandrovich Stolyar