Decomposition Process of Bastnaesite Concentrate by Microwave Chlorination

被引：0

作者：

Tian Y. ^{[1
,2
]}

Xu Y. ^{[1
,2
]}

Zheng Q. ^{[3
]}

Ma S. ^{[1
]}

Gao K. ^{[1
]}

机构：

[1] Institute of Resources and Ecological Environment, Baotou Research Institute of Rare Earths, Baotou

[2] Col⁃, lege of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot

[3] School of Metallurgy and Environment, Central South University, Changsha

来源：

Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2023年 / 41卷 / 04期

关键词：

active carbon; bastnaesite concentrate; chlorination; microwave radiation; non oxidation roasting; rare earths;

D O I：

10.11785/S1000-4343.20230420

中图分类号：

学科分类号：

摘要：

This article used microwave radiation to chlorinate 60% grade bastnaesite concentrate in Mianning，Sichuan Province，with anhydrous magnesium chloride as chlorination agent and activated carbon as auxiliary agent. This process can realize the roasting decomposition of bastnaesite concentrate and the non oxidation of rare earth cerium elements in air atmosphere. Through thermogravimetric （TG）-differential thermal analysis （DSC），X-ray diffraction（XRD），scanning electron microscopy（SEM）and energy spectrum analysis（EDS），the mechanism of nonoxidation reaction in the process of microwave chlorination decomposition of fluorocerium concentrate was clarified. Microwave chlorination decomposition of bastnaesite concentrate mainly produces rare earth oxychloride（REOCL）and magnesium fluoride（MgF2）. The optimum technological parameters of chlorina⁃ tion decomposition are as follows：microwave power of 1200 W，roasting temperature of 800 ℃，roasting time of 30 min，mineral salt ratio of 1∶0.25，and the amount of activated carbon of 15% of the mass of mixed ore. Un⁃ der these conditions，the decomposition rate of fluorocarbon cerium concentrate is 96.23%，and the leaching rate of fluorine in acid leaching solution is only 23.35%. The oxidation rate of cerium is less than 0.6%. © 2023 Chinese Society of Rare Earths. All rights reserved.

引用

页码：830 / 838

页数：8

共 21 条

[1] Ji L Q, Chen M X，, Gu H, Zhao J H, Yang H., Actuali⁃ ty of light rare earth resources and application in field of new energy vehicles［J］, Journal of the Chinese Soci⁃ ety of Rare Earths, 38, 2, (2020)
[2] Yang Q S, Yang T., Study on New Smelting Process of Bastnaesite ［J］, Rare Metals and Cemented Carbides, 42, 1, (2014)
[3] Xu G X., Rare Earth［M］, (1995)
[4] Zhao F, Zhao S L, Ma J, Wang Y M., Fluorine pollu⁃ tion control and fluorine resourcedevelopment in rare earth bastnaesite smelting［A］, 2003 Academic Annual Meeting of Sichuansociety of Environmental Sciences［C］
[5] Li D., Thermal decomposi⁃ tion mechanism of low-content-fluorite BayanObo rare earth concentrate roasted with sodium carbonate and its consequent separation study［J］, J. Rare Earths, 38, (2020)
[6] Dou Z H, Zhang T A., Kinetic study on bastnae⁃ site concentrate mechanochemical decomposition in NaOH solution［J］, J. Rare Earths, 38, 4, (2020)
[7] Liu H J, Xu Y H, Meng Z J, Cui J G, Zhang X X, Wang Y J., Static conditions of concentrated alkali of Baotou rare earth ore［J］, Chinese Rare Earth, 32, 1, (2011)
[8] Li M, Geng Y H, Zhang D L，, Gao K，, Li J F, Qiao X M., Roasting of high-grade mixed rare earth concentrated by Na<sub>2</sub>CO<sub>3</sub>-NaOH［J］, Journal of the Chinese Society of Rare Earths, 34, 1, (2016)
[9] Zhao L S, Wang L S，, Shuai G H，, Long Z Q，, Cui D L，, Huang X W., Thermal decomposition and oxidation of bastnaesite concentrate in inert and oxidative atmo⁃ sphere［J］, J. Rare Earths, 36, 7, (2018)
[10] Feng X L，, Long Z Q，, Cui D L，, Wang L S，, Huang X W，, Zhang G C., Kinetics of rare earth leaching from roasted ore of bastnaesite with sulfuric acid［J］, Trans. Nonferrous Met. Soc. China, 23, (2013)

← 1 2 3 →