Separation of aluminosilicates and diaspore from diasporic-bauxite by selective flocculation
来源期刊：中南大学学报(英文版)2008年第4期
论文作者：黄传兵 张麟 王毓华 兰叶
文章页码：520 - 525
Key words：diasporic-bauxite; sodium carbonate; sodium polyacrylate; ratio of Al2O3 to SiO2; selective flocculation; flocculant; dispersant
Abstract:
The flocculation tests of four pure minerals (diaspore, kaolinite, illite, pyrophyllite) and bauxite ore were investigated by the sedimentation. The dispersion behavior of the four pure minerals shows a very good consistency with the variation of zeta potential. The concentrate with the mass ratio of Al2O3 to SiO2 (m(Al2O3)/m(SiO2)) 8.90 and the recovery of Al2O3 86.98% is obtained from bauxite ore (m(Al2O3)/m(SiO2)=5.68) in pH range of 9.5-10.0 by using sodium carbonate (5 kg/t) and sodium polyacrylate (7 g/t) as dispersant and flocculant respectively. Sodium carbonate acts as both pH modifier and favorable dispersant for aluminosilicates. The high performance of sodium polyacrylate on flocculation for diaspore is contributed to the carboxyl of sodium polyacrylate that interacts with active Al sites on diaspore by chemical absorption, and the hydrogen bond effects between hydroxyl group of macromolecule and surface Al—OH on diaspore to accelerate the sedimentation of diaspore.
基金信息：the Major State Basic Research Development Program of China
