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

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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.

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Authors and Affiliations

  1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100080, China

    Chuan-bing Huang  (黄传兵)

  2. School of Resource Processing and Bioengineering, Central South University, Changsha, 410083, China

    Lin Zhang  (张 麟), Yu-hua Wang  (王毓华) & Ye Lan  (兰 叶)

Authors
  1. Chuan-bing Huang  (黄传兵)
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  2. Lin Zhang  (张 麟)
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  3. Yu-hua Wang  (王毓华)
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  4. Ye Lan  (兰 叶)
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Corresponding author

Correspondence to Yu-hua Wang  (王毓华).

Additional information

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

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Huang, Cb., Zhang, L., Wang, Yh. et al. Separation of aluminosilicates and diaspore from diasporic-bauxite by selective flocculation. J. Cent. South Univ. Technol. 15, 520–525 (2008). https://doi.org/10.1007/s11771-008-0098-4

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  • DOI: https://doi.org/10.1007/s11771-008-0098-4

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