Preparation of borax from boron concentrate by sodium-roasting and leaching

JIANG Tao; YIN Lu; ZHU Lei; XUE Xiangxin

doi:10.3969/j.issn.0438-1157.2014.02.052

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Preparation of borax from boron concentrate by sodium-roasting and leaching

更新时间：2025-12-10

- Preparation of borax from boron concentrate by sodium-roasting and leaching
- CIESC Journal Issue 2, Pages: 737-743(2014)
- 作者机构：
  
  1. 东北大学材料与冶金学院,辽宁,沈阳,110819
  2. 辽宁省冶金资源循环科学重点实验室,辽宁,沈阳,110819
  3. 辽宁省高校硼资源生态化综合利用技术与硼材料重点实验室,辽宁,沈阳,110819
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.02.052
  CLC： Q110.2
- Online First：05 February 2014，
  
  Published：05 February 2014
- 稿件说明：
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JIANG Tao, YIN Lu, ZHU Lei, et al. Preparation of borax from boron concentrate by sodium-roasting and leaching[J]. CIESC Journal, 2014, (2): 737-743.
DOI：

JIANG Tao, YIN Lu, ZHU Lei, et al. Preparation of borax from boron concentrate by sodium-roasting and leaching[J]. CIESC Journal, 2014, (2): 737-743. DOI： 10.3969/j.issn.0438-1157.2014.02.052.

摘要

以硼精矿为原料、Na2CO3为钠化剂，在TG-DTA热分析基础上，研究了硼精矿钠化焙烧-水浸制取硼砂过程中Na2CO3用量、焙烧温度、焙烧时间、成型压力对B2O3浸出率的影响，采用X射线衍射和扫描电镜对硼精矿钠化焙烧产物和硼砂制品的相组成和显微形貌进行了表征分析。结果表明：在5倍Na2CO3理论用量、样品成型压力5 MPa、温度850℃、保温3 h最优条件下，硼精矿中主要含硼矿物硼镁石[MgBO2（OH）]转变为可溶性硼酸钠盐Na3BO3和Na2B4O7，实现了硼矿物活化和碱解过程同步完成。焙烧产物经常压水浸，B2O3浸出率达91.05%。水浸滤液经除杂、蒸发、浓缩后获得了结晶良好的硼砂制品。

Abstract

Based on TG-DTA analysis

a sodium-roasting and water-leaching process were employed for the preparation of borax from boron concentrate

using Na2CO3 as sodium treatment reagent. The effects of Na2CO3 content

roasting temperature and holding time on leaching rate of B2O3 were investigated. Phase compositions and morphologies of roasted products and borax were analyzed by XRD and SEM. The results indicate that the optimal processing parameters are fivefold theoretical amount of Na2CO3

molding pressure of 5 MPa

roasting temperature of 850℃and holding time of 3 h. Under these conditions

activation and alkaline hydrolysis of boron mineral are completed synchronously

which make transformation of MgBO2(OH) into soluble Na3BO3 and Na2B4O7. The leaching rate of B2O3 in roasted products reaches 91.05%. Well-crystallized borax is obtained from leached filtrate after treatments of removing impurity

evaporation and concentration.

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