Separation of aluminosilicates and diaspore from diasporic-bauxite by selective flocculation  

作　　者：黄传兵 张麟 王毓华 兰叶 

机构地区：[1]Institute of Process Engineering,Chinese Academy of Sciences [2]School of Resource Processing and Bioengineering,Central South University

出　　处：《Journal of Central South University of Technology》2008年第4期520-525,共6页中南工业大学学报（英文版）

基　　金：Project(2005CB623701)supported by the Major State Basic Research Development Program of China

摘　　要：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.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.

关 键 词：diasporic-bauxite sodium carbonate sodium polyacrylate ratio of Al2O3 to SiO2 selective flocculation FLOCCULANT dispersant 

分 类 号：TF041[冶金工程—冶金物理化学]