Silicon saturation coefficient changes in hydrogarnets during the Bayer process with lime addition

doi:10.1016/j.cjche.2018.10.016

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (8): 1965-1972.DOI: 10.1016/j.cjche.2018.10.016

• Materials and Product Engineering • Previous Articles Next Articles

Silicon saturation coefficient changes in hydrogarnets during the Bayer process with lime addition

Guozhi Lü, Ting'an Zhang, Xiaofeng Zhu, Chaozhen Zheng, Yanxiu Wang, Weiguang Zhang, Zimu Zhang

Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, School of Metallurgy, Northeastern University, Shenyang 110819, China

Received:2018-05-31 Revised:2018-09-17 Online:2019-11-16 Published:2019-08-28
Contact: Ting'an Zhang
Supported by:
Supported by the National Natural Science Foundation of China (51874078, U1710257, U1202274), Fundamental Research Funds for the Central Universities of China (N140203005, N140204015), the Science and Technology Research Projects of Liaoning Education Department (L2014096), the State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources (YY2016006).

Silicon saturation coefficient changes in hydrogarnets during the Bayer process with lime addition

Guozhi Lü, Ting'an Zhang, Xiaofeng Zhu, Chaozhen Zheng, Yanxiu Wang, Weiguang Zhang, Zimu Zhang

Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, School of Metallurgy, Northeastern University, Shenyang 110819, China

通讯作者: Ting'an Zhang
基金资助:
Supported by the National Natural Science Foundation of China (51874078, U1710257, U1202274), Fundamental Research Funds for the Central Universities of China (N140203005, N140204015), the Science and Technology Research Projects of Liaoning Education Department (L2014096), the State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources (YY2016006).

Abstract

Abstract: The relationship between the silicon saturation coefficient of hydrogarnets and Bayer reaction parameters was studied. The peak position, crystal plane spacing, and cell edge length of typical hydrogarnet patterns were calculated to find the key factors influencing the relationship. The results showed that the crystal face (420) is the optimal garnet growth direction during hydration and crystal growth along the faces (521) and (611) were not affected significantly by the varying experimental conditions. The reaction temperature significantly influenced the silicon saturation coefficient of hydrogarnets. The silicon saturation coefficient of hydrogarnets increased from 0.2 to about 1.0 in the temperature range of 30-270℃ and a rapid expansion process was observed in the temperature range of 120-150℃. Moreover, the reaction time, alumina concentration, and C/S were shown to be less important factors. Averaging the results obtained by the 3 methods was shown suitable for calculating the SiO₂ saturation coefficient of hydrogarnets. The calculated results of the Al₂O₃ and SiO₂ contents matched the actual ones. However, the actual SiO₂ content was about 10% less than the calculated one for SiO₂ saturation coefficients higher than 1.

Key words: Hydrogarnet, Saturation coefficient, Peak position, Crystal plane spacing, Cell edge length

摘要： The relationship between the silicon saturation coefficient of hydrogarnets and Bayer reaction parameters was studied. The peak position, crystal plane spacing, and cell edge length of typical hydrogarnet patterns were calculated to find the key factors influencing the relationship. The results showed that the crystal face (420) is the optimal garnet growth direction during hydration and crystal growth along the faces (521) and (611) were not affected significantly by the varying experimental conditions. The reaction temperature significantly influenced the silicon saturation coefficient of hydrogarnets. The silicon saturation coefficient of hydrogarnets increased from 0.2 to about 1.0 in the temperature range of 30-270℃ and a rapid expansion process was observed in the temperature range of 120-150℃. Moreover, the reaction time, alumina concentration, and C/S were shown to be less important factors. Averaging the results obtained by the 3 methods was shown suitable for calculating the SiO₂ saturation coefficient of hydrogarnets. The calculated results of the Al₂O₃ and SiO₂ contents matched the actual ones. However, the actual SiO₂ content was about 10% less than the calculated one for SiO₂ saturation coefficients higher than 1.

关键词: Hydrogarnet, Saturation coefficient, Peak position, Crystal plane spacing, Cell edge length

Guozhi Lü, Ting'an Zhang, Xiaofeng Zhu, Chaozhen Zheng, Yanxiu Wang, Weiguang Zhang, Zimu Zhang. Silicon saturation coefficient changes in hydrogarnets during the Bayer process with lime addition[J]. Chinese Journal of Chemical Engineering, 2019, 27(8): 1965-1972.

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Silicon saturation coefficient changes in hydrogarnets during the Bayer process with lime addition

Silicon saturation coefficient changes in hydrogarnets during the Bayer process with lime addition

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