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Basic Research on Calcification Transformation Process of Low Grade Bauxite

  • Zhu Xiaofeng
  • Zhang Ting’an
  • Lv Guozhi
  • Liu Yan
  • Zhao Qiuyue
  • Dou Zhihe
  • Li Yan
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Our group put forward a “Calcification-Carbonation” new process use of low grade bauxite to produce alumina based on the problem of bauxite grade are decreasing gradually in china. This paper studies the effect of reaction thermodynamics, kinetics and processing parameters in calcification process. The thermodynamics calculation results show that both calcification reactions of gibbsite and diaspore can proceed within their dissolution temperature range. The study of Non-isothermal kinetics by high-pressure DCS results show that the calcification reaction for gibbsite occur within the temperature range 231.7–248.2°C and 248.2–268.7°C, with an activation energy of 23.7kJ/mol and 18.0kJ/mol respectively; diaspore occur within the temperature range 236.7–255.6°C and 255.6–287.5°C, with an activation energy of 264.9kJ/mol and 118.5kJ/mol respectively. Experimental results show that the appropriate calcification temperature of diaspore and gibbsite are 245°C and 180°C, molar ratio of CaO to SiO2 is 4.69:1; under these condition, silicon phase in minerals transformed hydrogarnet completely.

Keywords

low grade bauxite calcification-carbonation calcification transformation hydrogarnet 

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References

  1. 1.
    GUO Jian, REN Ai-jun, FANG Qi-xue, et al., “A Study on Separation Diaspore and Kaolinite by Reverse Flotation,” Nonferrous Metals, 3(2003), 1–5.Google Scholar
  2. 2.
    CAO Xue-feng, ZHANG Li-min, HU Yue-hua et al., “Synthesis of N, N-diethyl Dodecyl Amine and Its Flotation Properties on Bauxite,” Journal of Central South University(Science and Technology), 15(2008), 188–189.CrossRefGoogle Scholar
  3. 3.
    GU Song-qing, “Alumina production technology with high efficiency and low consumption from Chinese bauxite resource,” The Chinese Journal of Nonferrous Metals, 14(2004), 91–92.Google Scholar
  4. 4.
    ZHANG Ya-li, ZHANG Bang-sheng, YU Xian-jin et al., “Thermodynamic Analysis on Sodium Hydrate Alumino-silicate Treatment,” Nonferrous Metals, 62(2010), 64–67.Google Scholar
  5. 5.
    WEN Yuan-kai, SHAO Jun, WANG San-shan et al., “A Simplified Formula to Calculate Heat of Formation of Oxyacid Salt and Mineral,” Acta Metallrugica Sinica, 15(1979),99–107.Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  • Zhu Xiaofeng
    • 1
  • Zhang Ting’an
    • 1
  • Lv Guozhi
    • 1
  • Liu Yan
    • 1
  • Zhao Qiuyue
    • 1
  • Dou Zhihe
    • 1
  • Li Yan
    • 1
  1. 1.Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of EducationNortheastern UniversityShenyang, LiaoningChina

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