298.15 K下KBr-CaBr_(2)-SrBr_(2)-H_(2)O四元体系相平衡研究  

Brine Mineral Equilibrium Studies of a KBr-CaBr_(2)-SrBr_(2)-H_(2)O System at 298.15 K

作　　者：杨秋叶 崔瑞芝[1,2] 聂国亮 任红保 李武 YANG Qiuye;CUI Ruizhi;NIE Guoliang;REN Hongbao;LI Wu(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,Qinghai 810008;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,Qinghai 810008;College of Materials and Chemical Engineering,Chengdu University of Technology,Chengdu,Sichuan 610059)

机构地区：[1]中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源化学重点实验室,青海西宁810008 [3]成都理工大学材料与化学化工学院,四川成都610059

出　　处：《地球学报》2024年第5期791-797,共7页Acta Geoscientica Sinica

基　　金：青海省自然科学基金项目(编号:2024-ZJ-901)资助。

摘　　要：青海柴达木盆地深部地下卤水中富含大量钾、钙、锶、溴等元素,是极具综合利用价值的液态矿产资源,可作为钾盐潜在开发资源。本文根据该地下卤水的组成特点,采用等温溶解平衡法对四元体系KBr-CaBr_(2)-SrBr_(2)-H_(2)O在298.15 K时溶解度和相平衡规律进行详细的研究。测定该体系各盐在溶液中的溶解度和平衡固相组成,根据实验结果绘制相应的稳定平衡相图和水含量图。该四元体系在298.15 K下没有复盐和固溶体生成,其平衡相图中有一个共饱点,三条单变量曲线,和三个固相结晶区(KBr、CaBr_(2)-6H_(2)O、SrBr_(2)-6H_(2)O)。基于Pitzer模型,对该四元体系在298.15 K下的溶解度进行模拟计算,绘制出计算相图,计算相图与实验相图基本吻合。The deep underground brine of Qaidam Basin in Qinghai is rich in potassium,calcium,strontium,bromine and other elements,making it a liquid mineral resource with great comprehensive utilization value.Notably,its brine can be developed as a potential potassium salt resource.In this study,the solubility and phase equilibrium of the quaternary KBr-CaBr_(2)-SrBr_(2)-H_(2)O system at 298.15 K were studied in detail using the isothermal dissolution equilibrium method,based on the compositional characteristics of the deep underground brine.The solubility and equilibrium solid-phase compositions of the relevant salts of this system were determined.Based on the experimental data,a diagram of the stable phase equilibrium and water content of the system at specific temperature conditions has been plotted.This phase diagram has no complex salt and solid solution generation at 298.15 K,has one invariant point,three univariant dissolution curves,and three solid-phase crystalline zones(KBr,CaBr_(2)-6H_(2)O,SrBr_(2)-6H_(2)O).Based on the Pitzer model,the solubility of this quaternary system at 298.15 K was predicted,and its calculated phase diagram agrees well with the experimental phase diagram.

关 键 词：钾盐 相图 溴化物 卤水矿物体系 深部卤水 

分 类 号：P619.211[天文地球—矿床学]