Process for producing an aluminum trihydroxide of coarse core size

摘要

PCT No. PCT/FR84/00195 Sec. 371 Date Jun. 6, 1985 Sec. 102(e) Date Jun. 6, 1985 PCT Filed Sep. 4, 1984 PCT Pub. No. WO85/01040 PCT Pub. Date Mar. 14, 1985.A method of decomposing a super-saturated solution of alkali metal aluminate Ld from the Bayer process, by introducing primer Sa and forming a suspension with a high content of dry material, of at least 700 g/l of alkali metal aluminate solution to be decomposed, is characterized in that, for the purpose of obtaining Al(OH)3 with a large, even particle size, a zone (Zs) for separating particularly fine solid particles of Al(OH)3 is formed in decomposition zone (B) comprising a cascade of n stages of the Bayer process, the separating zone being fed with at least part L(n-3)1 of the flow of suspension Ln-3 circulating in said zone (B), from which a fraction LS1 is extracted, containing at least 5% of the total number of fine particles with a maximum diameter of 40 microns present in the flow Ln-3, while the residual suspension LS2 emerging from the separating zone Zs is recycled to zone (B), then the fraction Ls1 is treated by a known means for reducing the number of fine particles by at least 50%, and is recycled to a stage in the Bayer process.