Other

Vladimir Nikolaevich Kostin

Nikolai A Kaluzhsky

Gakif Zakirovich Nasyrov

Nikolai S Shmorgunenko

Nikolai Ivanovich Eremin

Mikhail Ivanovich Zaitsev

Semen Alexandrovich Tager

Boris Alexandrovich Stolyar

Lev Nikolaevich Bobkov

Viktor Prokhorovich Lyakhov

Viktor Mikhailovich Kozlov

Fritiof Meerovich Yakhilevich

Vitaly Mikhailovich Averin

Faitel Markovich Rubinchik

Vladlen Iosifovich Panin

Ljudmila Nikolaevna Abramova

German Abramovich Kaim

Abram Zinovievich Jurovsky

Vladimir Ivanovich Tarasov

Mikhail Yakovlevich Shpirt

Vladislav Mikhailovich Denisov

Savely Mikhailovich Milrud

Muzafar Suleiman-ogly Tagiev

Vladimir Ivanovich Lagno

Garry Vladimirovich Telyatnikov

Dinam Latypovich Nasyrov

The invention relates to a process for the production of alumina from mineral component of solid fuels containing aluminum, silicon and iron oxides. The process comprises burning a mixture of a solid fuel with limestone in the following molar ratios of limestone to said oxides: CaO:SiO.sub.2 =2.0, CaO:Al.sub.2 O.sub.3 =1.3-1.8, CaO:Fe.sub.2 O.sub.3 =1.0, at 1700.degree.-1900.degree. C. As a result, a melt is obtained containing calcium compounds: 2CaO.SiO.sub.2, 12CaO.7Al.sub.2 O.sub.3, CaO.Al.sub.2 O.sub.3, CaO.Fe.sub.2 O.sub.3. The melt is cooled and leached with soda solutions for extracting alumina. The sludge remaining after the leaching is suitable for Portland cement production. The invention enables a considerable enlargement of the range of starting products for aluminum and cement industries due to the use of the mineral component of solid fuels, an about twofold reduction of capital investments in the alumina production and reduction of the fuel consumption by 30-40%.

Process for the production of alumina from the mineral component of

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

The specific feature of the present method is that in the process solution resulting in the processing of alunite with the object of producing alumina and potassium sulphate therefrom, an excess amount of sodium ions is maintained with respect to the potassium ions. The method is advantageous in that it ensures a higher yield of potassium sulphate and a lower contamination of the final products with respect to sodium and potassium ions.

Method of producing alumina and potassium sulphate form alunite

Growing community of inventors

Moscow, Russia

Vladimir Nikolaevich Kostin