Process for desilication of aluminate solution

Details Process for desilication of aluminate solution Process for desilication of aluminate solution

C - Chemistry, Metallurgy

01

F

23/238

C01F 7/02 (2006.01) C01F 7/47 (2006.01)

Patent

CA 1197070

ABSTRACT OF THE DISCLOSURE The present invention provides a process for desilication of aluminate solutions which comprises treat- ment of the aluminate solution first with a calsium-contain- ing reagent "a" which is a product of the reaction of desilica- tion of the aluminate solution; reagent "a" contains mainly calcium hydrogarnet of the formula: 3CaO.A12O3.nSiO2(6-2n)H2O wherein n A? 1, and then with a reagent "b" of the formula: 4CaO.A12O3(0.1-0.6)X.mH2O wherein X is CO2 and/or SO3; m = 8 to 15. The treatment of the aluminate solution with reagent "a" is carried out for 0.5 to 2 hours at a temperature ranging from 40 to 105°C. Weight ratio of reagents "a" and "b" is maintained within the range of from 1:1 to 3:1. The process according to the present invention is useful in the manufacture of alumina.

420184

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