Digestion performance and microstructure evolution of desilicated concentrate from low-grade high sulfur bauxite

被引：3

作者：

Wu H. ^{[1
,2
]}

Xia F. ^{[1
,2
]}

Li J. ^{[1
,2
]}

Chen C. ^{[1
,2
]}

Xu S. ^{[3
]}

Zhang S. ^{[1
,2
]}

机构：

[1] School of Materials and Metallurgy, Guizhou University, Guiyang

[2] Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang

[3] Guiyang Aluminum Magnesium Design & Research Institute Co. Ltd., Guiyang

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Crystal structure; High pressure digestion; High sulfur bauxite; Specific surface area;

D O I：

10.11817/j.issn.1672-7207.2019.09.003

中图分类号：

学科分类号：

摘要：

To effectively develope and utilize the low grade high sulfur bauxite, and reduce the hazards of sulfur minerals in the Bayer process and improve the digestion properties of alumina, the effects of caustic alkali mass concentration, time, lime addition amount and temperature on the digestion performance of desilicated concentrate were systematically investigated after roasting desulfurization and alkali leaching desilication. The results show that the best digestion conditions are as follows: the digestion temperature is 280 ℃; the caustic mass concentration is 245 g/L; the digestion time is 70 min ; the lime mass fraction is 8%. The relative digestion ratio is 95.14%, which is 7.50% higher than that of the raw ore and 9.77% higher than that of the calcined ore, respectively. The mass concentration of sulfur in the digestion solution of desilicated concentrate is 0.11 g/L, and the actual digestion ratio of sulfur is 11.2%. The specific surface area of desilicated concentrate increases to 31.25 m2/g, pore volume and pore diameter increase to 0.078 43 cm3/g and 14.76 nm, respectively. The reaction of [113] surface of alumina crystal during alkali leaching process leads to the decrease of grain size. The interplanar spacing of desilicated concentrate decreases and the length Al-O increases, with two bond lengths of 0.185 4 nm and 1.971 0 nm, respectively. © 2019, Central South University Press. All right reserved.

引用

页码：2074 / 2083

页数：9

共 23 条

[1] Primary aluminium production
[2] Lu G., Basic research on alumina production by using high-sulfur bauxite, pp. 7-8, (2010)
[3] Li X., Li C., Peng Z., Et al., Interaction of sulfur with iron compounds in sodium aluminate solutions, Transactions of Nonferrous Metals Society of China, 25, 2, pp. 608-614, (2015)
[4] Li X., Niu F., Liu G., Et al., Effects of iron-containing phases on transformation of sulfur-bearing ions in sodium aluminate solution, Transactions of Nonferrous Metals Society of China, 27, 4, pp. 908-916, (2017)
[5] Chai Q., Yang C., Kok L.T., Et al., Optimal control of an industrial-scale evaporation process: sodium aluminate solution, Control Engineering Practice, 20, 6, pp. 618-628, (2012)
[6] Hu X., Chen W., Xie Q., Sulfur phase and sulfur removal in high sulfur-containing bauxite, Transactions of Nonferrous Metals Society of China, 21, 7, pp. 1641-1647, (2011)
[7] Kong X., Jiang X., Xue S., Et al., Migration and distribution of saline ions in bauxite residue during water leaching, Transactions of Nonferrous Metals Society of China, 28, 3, pp. 534-541, (2018)
[8] Pan X., Yu H., Tu G., Et al., Effects of precipitation activity of desilication products (DSPs) on stability of sodium aluminate solution, Hydrometallurgy, 165, pp. 261-269, (2016)
[9] Zhao B., Chen Y., Jiu S., Et al., Suspended roasting of high sulfur bauxite and leaching performance of roasted ore, Journal of Central South University (Science and Technology), 47, 9, pp. 2929-2935, (2016)
[10] Liu Z., Li D., Ma W., Et al., Sulfur removal by adding aluminum in the bayer process of high-sulfur bauxite, Minerals Engineering, 119, pp. 76-81, (2018)

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