自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 3    March 2017

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Effect of ferrite content on dissolution kinetics of gibbsitic bauxite under atmospheric pressure in NaOH solution
YANG Hui-bin(杨会宾)1, 2, PAN Xiao-lin(潘晓林)1, YU Hai-yan(于海燕)1, TU Gan-feng(涂赣峰)1, SUN Jun-min(孙俊民)2

1. School of Metallurgy, Northeastern University, Shenyang 110004, China;
2. Datang International High Aluminum Coal R&D Center
(National Energy Sources High Aluminum Coal Development and Utilization Key Laboratory), Ordos 010321, China

Abstract:The dissolution property of high-ferrite gibbsitic bauxite and the effect of ferrite content on the dissolution kinetics of gibbsitic bauxites in sodium hydroxide solution under atmospheric pressure from 50 to 90 °C were systematically investigated. The dissolution property of high-ferrite gibbsitic bauxite is increased by increasing the dissolution temperature and the NaOH concentration or decreasing the particle size of bauxite, which is easy to dissolve under atmospheric pressure. The kinetic equations of gibbsitic bauxites with different ferrite contents during the dissolution process at different temperatures for different times were established, and the corresponding activation energies were calculated. The ferrite in the gibbsitic bauxite reduces the dissolution speed and increases the activation energy of dissolution, the diffusion process of which is the rate-controlling step.

 

Key words: gibbsitic bauxite; dissolution; kinetics; ferrite; Bayer process

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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