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

  • Chuan-bing Huang (黄传兵)
  • Lin Zhang (张 麟)
  • Yu-hua Wang (王毓华)Email author
  • Ye Lan (兰 叶)
Article

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.

Key words

diasporic-bauxite sodium carbonate sodium polyacrylate ratio of Al2O3 to SiO2 selective flocculation flocculant dispersant 

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Copyright information

© Central South University Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Chuan-bing Huang (黄传兵)
    • 1
  • Lin Zhang (张 麟)
    • 2
  • Yu-hua Wang (王毓华)
    • 2
    Email author
  • Ye Lan (兰 叶)
    • 2
  1. 1.Institute of Process EngineeringChinese Academy of SciencesBeijingChina
  2. 2.School of Resource Processing and BioengineeringCentral South UniversityChangshaChina

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