无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2026, Vol. 58 ›› Issue (2): 45-52.doi: 10.19964/j.issn.1006-4990.2025-0022

• 研究与开发 • 上一篇    下一篇

低品位硫酸盐型沉积盐矿中钾盐溶浸转化规律的研究

梅辛聪1(), 姚莫白2, 孙哲3, 张迎霜1, 王雪莹1(), 黄雪莉1(), 王雪枫1   

  1. 1.新疆煤炭清洁转化与化工过程自治区重点实验室,新疆大学化工学院,新疆 乌鲁木齐 830017
    2.国投新疆罗布泊钾盐有限责任公司,新疆 哈密 839000
    3.新疆有色金属研究所,新疆 乌鲁木齐 830054
  • 收稿日期:2025-01-15 出版日期:2026-02-10 发布日期:2025-08-12
  • 通讯作者: 王雪莹(1988— ),女,副教授,主要研究方向为水盐体系相图;E-mail:wangxy229@xju.edu.cn
    黄雪莉(1965— ),女,教授,主要研究方向为化工过程开发;E-mail:xuelih@163.com
  • 作者简介:梅辛聪(1997— ),女,硕士,主要研究方向为盐湖钾资源的开发利用;E-mail:xcmei9801@163.com
  • 基金资助:
    新疆维吾尔自治区重点研发计划项目(2022B01041)

Study on leaching transformation characteristics of potassium salts from low-grade sulfate-type sedimentary salt deposits

MEI Xincong1(), YAO Mobai2, SUN Zhe3, ZHANG Yingshuang1, WANG Xueying1(), HUANG Xueli1(), WANG Xuefeng1   

  1. 1.Key Laboratory of Xinjiang Coal Clean Conversion and Chemical Process,College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830017,China
    2.SDIC Xinjiang Luobupo Potash Co. ,Ltd. ,Hami ;839000,China
    3.Xinjiang Nonferrous Metals Research Institute Co. ,Ltd. ,Urumqi 830054,China
  • Received:2025-01-15 Published:2026-02-10 Online:2025-08-12

摘要:

罗布泊地区分布着一定储量的硫酸盐型沉积盐矿,钾含量虽然不高,但仍具有开发利用的价值。对该硫酸盐型沉积盐矿进行晶体结构分析,并对矿样进行溶浸提取钾实验研究。研究结果表明:该硫酸盐型沉积盐矿主要成分为NaCl,并含有较多的硫酸盐及其复盐,如硫酸镁、芒硝、石膏、杂卤石、钾镁矾和少量光卤石等;K+含量为1.9%~5.3%(质量分数,下同),Mg2+含量为4.2%~6.9%,SO42-含量为17.1%~30.2%。采用罗布泊原卤、罗布泊盐湖卤水生产硫酸钾工艺不同阶段的工艺卤水、不同的饱和盐水和去离子水进行溶浸实验,发现罗布泊原卤是溶浸该盐矿提取钾的较佳溶浸剂;溶浸剂中硫酸根含量高有利于K+浸出;溶浸液固比对钾浸出率影响最为显著,其次是溶浸温度,溶浸时间影响最小。罗布泊原卤溶浸较优的条件是液固比为2.0、溶浸温度为25 ℃、溶浸时间为45 min,K+浸出率可达87.6%,浸出液中 K+含量提高至原卤的2.53倍。研究结果可为硫酸盐型沉积盐矿中钾的开发利用提供理论支撑和数据支持。

关键词: 罗布泊, 硫酸盐型沉积盐矿, 溶浸转化, 钾浸出率

Abstract:

The Lop Nur region hosts certain reserves of sulfate-type sedimentary salt deposits.Although its potassium content is not high,it still possesses value for development and utilization.Crystal structure analysis was conducted on this sulfate-type sedimentary salt deposits,along with experimental studies on potassium extraction via leaching.The results indicated that the ore was primarily composed of NaCl and contained substantial amounts of sulfates and their double salts,such as magnesium sulfate,mirabilite,gypsum,polyhalite,kainite,and minor carnallite.The content ranges were 1.9% to 5.3% for K⁺,4.2% to 6.9% for Mg²⁺,and 17.1% to 30.2% for SO₄²⁻(all by mass).Leaching experiments employing raw brine from Lop Nur,process brines from different stages of potassium sulfate production using Lop Nur salt lake brine,various saturated brines,and deionized water revealed that the raw Lop Nur brine was the superior leaching agent for potassium extraction from this salt deposits.A high sulfate ion content in the leaching agent favored K⁺ dissolution.Among the leaching parameters,the liquid-to-solid ratio exerted the most significant influence on the potassium leaching rate,followed by leaching temperature,with leaching time having the least effect.The optimal leaching conditions using raw Lop Nur brine were liquid-to-solid ratio of 2.0,temperature of 25 ℃,and duration of 45 min.Under these conditions,the K⁺ leaching rate reached 87.6%,and the K⁺ content in the leachate was increased to 2.53 times that of the original brine.These findings provided theoretical support and data for the development and utilization of potassium from sulfate-type sedimentary salt deposits.

Key words: Lop Nur, sulfate-type sedimentary salt deposits, leading transformation, potassium leaching rate

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