C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
23/240, 53/240
C22B 21/00 (2006.01)
Patent
CA 1086504
- 13 - ABSTRACT The invention relates to a process for the production of alumina from mineral component of solid fuels containing alu- minium, 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?SiO2=2.0, CaO:Al2O3= 1.3-1.8, CaO:Fe2O3=1.0 at 1700-1900°C. As a result, a melt is obtained containing calcium compounds 2CaO?SiO2, 12CaO?7Al2O3, CaO?Al2O3, CaO?Fe2O3. 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 mineral component of solid fuels, an about twofold reduction of capital investments of alumina production and reduction of fuel consumption by 30-40%.
254302
Bobkov Lev N.
Eremin Nikolai I.
Jurovsky Abram Z.
Kaluzhsky Nikolai A.
Kostin Vladimir N.
Ogilvy Renault
Vsesojuzny Nauchno-Issledovatelsky I. Proektny Institut Aljumini Mag Nievoi I. Elektrodnoi Promyshlennosti
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