NaOH-Ca(OH)2分解独居石精矿的研究

doi:10.12068/j.issn.1005-3026.2019.09.013

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (9): 1284-1290.DOI: 10.12068/j.issn.1005-3026.2019.09.013

NaOH-Ca(OH)₂分解独居石精矿的研究

张波¹，薛向欣¹，杨合¹，李正哲^{1, 2}

(1. 东北大学冶金学院，辽宁沈阳110819; 2. 金策工业综合大学，朝鲜平壤999093)

收稿日期:2018-09-10 修回日期:2018-09-10 出版日期:2019-09-15 发布日期:2019-09-17
通讯作者: 张波
作者简介:张波(1987- )，男，山西临汾人，东北大学博士研究生；薛向欣(1954- )，男，辽宁沈阳人，东北大学教授，博士生导师；杨合(1970- )，男，内蒙古兴安盟人，东北大学教授，博士生导师.
基金资助:
国家重点基础研发计划项目(2012CBA01205).

Study on Decomposition of Monazite Concentrate in NaOH-Ca(OH)₂

ZHANG Bo¹， XUE Xiang-xin¹， YANG He¹， RI Jong-chol^{1, 2}

1. School of Metallurgy， Northeastern University， Shenyang 110819， China; 2. Kim Chaek University of Technology， Pyongyang 999093， DPR of Korea.

Received:2018-09-10 Revised:2018-09-10 Online:2019-09-15 Published:2019-09-17
Contact: YANG He
About author:-
Supported by:
-

摘要/Abstract

摘要： 为降低独居石分解工艺的加碱量，并提高独居石分解率，本研究在NaOH-Ca(OH)₂体系中对独居石精矿进行焙烧分解，采用XRD对焙烧产物进行物相分析，并结合焙烧矿中稀土元素在盐酸中的浸出率判断独居石分解效果.实验分别研究了NaOH添加量、Ca(OH)₂添加量、焙烧温度以及焙烧时间对独居石精矿分解的影响.结果表明，在NaOH-Ca(OH)₂体系中，独居石精矿分解的最佳工艺条件:NaOH添加量为25%，Ca(OH)₂添加量为20%，焙烧温度为800℃，焙烧时间为1.5h.该焙烧条件下独居石全部分解为稀土氧化物，浓盐酸对稀土浸出率可达到98%左右.与现有工业生产工艺相比，本研究工艺中碱添加量降低55%左右，独居石分解率提高2%左右.

关键词: 独居石, NaOH-Ca(OH)₂, 焙烧分解, 物相分析, 稀土浸出率

Abstract: In order to decrease alkali dosage and increase decomposition rate of monazite， decomposition experiment of monazite concentrate in system of NaOH-Ca(OH)₂ was implemented by roasting. The roasted products were characterized by using X-ray diffraction. The decomposition effect of monazite was further judged through leaching rate of rare earth in hydrochloric acid. The influence factors for roasting process， such as roasting temperature， NaOH dosage， Ca(OH)₂ dosage and roasting time were investigated. The optimum roasting decomposition parameters are proposed as the following: roasting temperature of 800℃， NaOH dosage of 25%， Ca(OH)₂ dosage of 20%， and roasting time of 1.5h. With these optimum parameters， rare earth phase transformed from REPO₄ into REO. Leaching experiments demonstrated that leaching rate of rare earth in concentrated hydrochloric acid reaches up to 98% in these optimum parameters. Comparing with index of industrial production process， alkali dosage in this process reduces about 55%. Additionally， decomposition rate of monazite increased about 2%.

Key words: monazite, NaOH-Ca(OH)₂, roasting decomposition, phase analysis, rare earth leaching rate

中图分类号:

TF803

张波，薛向欣，杨合，李正哲. NaOH-Ca(OH)₂分解独居石精矿的研究[J]. 东北大学学报:自然科学版, 2019, 40(9): 1284-1290.

ZHANG Bo， XUE Xiang-xin， YANG He， RI Jong-chol. Study on Decomposition of Monazite Concentrate in NaOH-Ca(OH)₂[J]. Journal of Northeastern University Natural Science, 2019, 40(9): 1284-1290.

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NaOH-Ca(OH)₂分解独居石精矿的研究

Study on Decomposition of Monazite Concentrate in NaOH-Ca(OH)₂

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