地学前缘 ›› 2021, Vol. 28 ›› Issue (6): 171-178.DOI: 10.13745/j.esf.sf.2021.1.54

• 绿色提钾新工艺 • 上一篇    下一篇

川东北普光地区深层富钾卤水钾资源提取研究

边绍菊1,2, 刘鑫1,3, 李东东1,4, 董亚萍1,3, 李武1,4,*   

  1. 1.中国科学院 青海盐湖研究所 中国科学院盐湖资源综合高效利用重点实验室, 青海 西宁 810008;
    2.青海师范大学 化学化工学院, 青海 西宁 810016;
    3.青海省盐湖资源综合利用工程技术中心, 青海 西宁 810008;
    4.青海省盐湖资源化学重点实验室, 青海 西宁 810008
  • 收稿日期:2020-09-11 修回日期:2021-01-25 出版日期:2021-11-25 发布日期:2021-11-25
  • 通讯作者: *李 武(1966—),男,研究员,博士生导师,研究方向为卤水资源综合利用。E-mail:liwu@isl.ac.cn
  • 作者简介:边绍菊(1981—),女,讲师,无机化学专业,主要从事卤水资源提取研究。E-mail:bee_bian@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFC0602805); 青海省科技厅基础研究计划-青年项目(2019-ZJ-958Q)

Potassium extraction from potassium-rich brine in Puguang region, northeastern Sichuan, China

BIAN Shaoju1,2, LIU Xin1,3, LI Dongdong1,4, DONG Yaping1,3, LI Wu1,4,*   

  1. 1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
    2. School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810016, China;
    3. Qinghai Engineering and Technology Research Center for Comprehensive Utilization of Salt Lake Resources, Xining 810008, China;
    4. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
  • Received:2020-09-11 Revised:2021-01-25 Online:2021-11-25 Published:2021-11-25

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摘要： 四川盆地地下卤水资源丰富,尤其川东北地区地下卤水富含高品质钾资源。本项目以四川普光地区富钾卤水为研究对象,根据卤水组成,采用模拟计算并结合实验验证的方法,研究了高温蒸发时,氯化钠、氯化钾、光卤石、硼酸等矿物的析出阶段及特点。研究结果表明,当蒸失水率约80%时,体系中约85%的NaCl析出,同时KCl达到饱和,继续蒸发可获取钾石盐。控制总蒸失水率94%~95%时分离,体系中大于80%的钾可在这一阶段析出,且湿基中KCl品位可高达约45%;析出钾石盐后的卤水降至室温可获得NaCl、KCl、KCl·MgCl2·6H2O及H3BO3的混合物,硼的析出率可达到约80%。同时,研究表明,将蒸失水率约80%时分离石盐后的卤水直接降温可以获得湿基品位约高达70%的钾石盐矿,钾析出率约50%。综合对比分析,提出两条以钾资源开发为主的工艺路线:其一为“高温蒸发析氯化钠-高温蒸发析氯化钾-冷却析钾硼混盐”,通过加工获得KCl及H3BO3产品;其二为“高温蒸发析氯化钠-冷却析钾”,通过加工获得高端KCl产品。

关键词: 川东北, 普光地区, 富钾卤水, 沸腾蒸发

Abstract: The underground brine resources in northeastern Sichuan are abundant, especially in the Puguang region where underground brines are rich in high-quality potassium resource. In this work, computational simulation and experimental verification were carried out to investigate the crystallization stages and features of NaCl, KCl, KCl·MgCl2·6H2O, and H3BO3 under high temperature evaporation. The results showed that ~85% of NaCl crystallized when the rate of water loss was about 80% and KCl saturation was reached; under continuing evaporation, sylvite was produced. As the rate of water loss reached 94%-95%, almost 80% of potassium (KCl) precipitated and the KCl concentration in the precipitant could be as high as ~45% (mass fraction). Subsequently, as the resulting brine cooled down to room temperature, NaCl, KCl, KCl·MgCl2·6H2O, and H3BO3 co-crystallized, including ~80% of boron. Notably, after 80% of water evaporated and most of NaCl precipitated, directly cooling of brine could yield sylvite of grade up to 70%, with 50% of KCl crystallized. Finally, two potassium extraction processes were suggested, one focuses on the production of KCl and H3BO3, the other on high-quality KCl.

Key words: northeastern Sichuan, Puguang region, potassium-rich brine, high temperature evaporation

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