Process for desilication of aluminate solution

• Main Authors: ALEXEEV; ALEXEI I, AFANASIEV; VALENTIN N, FINKELSHTEIN, ADMINISTRATOR; JULIA L, KOSTIN; IVAN M, MIRONOV; EVGENY I, BADAIANTS; KHOREN A, ALEXANDROVA; ZARYA N, FINKELSHTEIN, ADMINISTRATOR; NINA J, SIZYAKOV; VIKTOR M, ZATULOVSKY; ISAAK A, ISAKOV; EVGENY A, ZHUKOV; ALEXANDR G, CHERNOV; VINETSY I, KUTSENKO; VIKTOR S, VYSOTSKAYA; GALINA M, VLADIMIROV; PAVEL S, FINKELSHTEIN, DECEASED; LEONID I, OSTROVLYANCHIK; EVGENIA S, KALUZHSKY; NIKOLAI A
• Format: Patent
• Language: English
• Published: 19.06.1984
• Subjects: CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; INORGANIC CHEMISTRY; METALLURGY

The present invention relates to the production of alumina and, more specifically, to a process for desilication of aluminate solutions. The process of desilication according to the present invention comprises treatment of the aluminate solution first with a calcium-containing reagent "a" which is a product of the reaction of desilication of the aluminate solution; reagent "a" contains mainly calcium hydrogarnet of the formula: 3CaO.Al2O3.nSiO2(6-2n)H2O wherein n</=1, and then with a reagent "b" of the formula: 4CaO.Al2O3(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 DEG to 105 DEG 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.