Li-Na-K-Mg-Ca-Sr-Cl-H2O七元体系多温相平衡性质的热力学模拟研究
Thermodynamic Modeling of the Phase Equilibrium in the Li-Na-K-Mg-Ca-Sr-Cl-H2O System 
投稿时间:2020-12-25  修订日期:2021-03-22
DOI:10.12119/j.yhyj.202103003
中文关键词:  含锶卤水  热力学模拟  相平衡  多温  Pitzer-Simonson-Clegg模型
英文关键词:Strontium-containing brine  Phase equilibrium  Thermodynamic modeling  Multiple-temperature  Pitzer-Simonson-Clegg model
基金项目:国家自然科学基金委员会—青海省人民政府柴达木盐湖化工科学研究联合基金(U1707602);国家重点研发计划(2017YFC0602805);青海省重大科技专项(2019-GX-A7)
作者单位E-mail
雷锦顺 中南大学化学化工学院,湖南 长沙 410083 182312123@csu.edu.cn 
李东东 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
青海省盐湖资源化学重点实验室,青海 西宁 810008 
 
庄子宇 中南大学化学化工学院,湖南 长沙 410083  
曾德文 中南大学化学化工学院,湖南 长沙 410083
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 
 
李武 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
青海省盐湖资源化学重点实验室,青海 西宁 810008 
 
高丹丹 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
青海省盐湖资源综合利用工程技术中心,青海 西宁 810008 
 
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中文摘要:
      地下卤水中普遍存在较高浓度的锶(>1 g/L),研究该类卤水中锶的成盐规律对于资源综合利用具有重要的指导意义。采用Pitzer-Simonson-Clegg超额Gibbs自由能方程和CALPHAD方法构建了Li-Na-K-Mg-Ca-Sr-Cl-H2O体系的多温相平衡热力学模型,确定了5个含氯化锶三元子体系的多温混合参数。在广泛的温度范围内(273.15 K~373.15 K),模型计算结果与大多数实验结果基本一致,但对于一些体系,模型预测的平衡固相和相区大小仍与实验结果之间存在显著差异;实验数据的离散和匮乏成为全面检验模型预测结果的最大障碍。将模型用于我国三种典型含锶卤水(青海南翼山油田水、四川宣汉川25井卤水和四川平落坝地下卤水)结晶行为的模拟表明:这三种卤水蒸发后期均会有锶盐形成,温度较低时形成SrCl2·6H2O,温度较高时形成SrCl2·2H2O;温度对青海南翼山油田水和四川宣汉川25井卤水中锶富集最大程度的影响较大,温度升高均有利于锶在卤水中的富集;相比之下,四川平落坝地下卤水中锶的最大富集程度受温度影响较小,当高温析出SrCl2·2H2O时卤水中锶的最高浓度几乎不受温度影响。
英文摘要:
      Underground brines,such as oilfield water,have generally high concentrations of strontium(> 1 g/L),and the study of the formation of strontium salt has important guiding significance for the comprehensive utilization of underground brines.The Pitzer-Simonson-Clegg excess Gibbs free energy equation and CALPHAD method were used to construct a multi-temperature phase equilibrium thermodynamic model of the strontium-containing chloride brine system Li-Na-K-Mg-Ca-Sr-Cl-H2O,then the temperature-dependent parameter of five ternary sub-systems containing strontium chloride were determined.In a wide temperature range(273.15 K-373.15 K),the simulation results are basically consistent with most experimental results,but for some systems,at certain temperatures,the equilibrium solid phase and phase region size predicted by the model are inconsistent with the experimental results.The lack of experimental data becomes the biggest obstacle to comprehensively testing the prediction results of the model.Using this model to simulate the crystallization behavior of three typical strontium-containing brines in China(Qinghai Nanyishan oilfield water,Sichuan Xuanhan Chuan 25 Well brine,and Sichuan Pingluoba underground brine),the simulation result shows that the strontium salt precipate from brines at the late evaporation of these three brines,and recipitation is SrCl2·6H2O at lower temperature while SrCl2·2H2O at higher temperature.Temperature change has a significant effect on the maximum concentration of strontium in the liquid phase during evaporation of Qinghai Nanyishan Oilfield water and Sichuan Xuanhan chuan 25 Well brine and the maximum enrichment of strontium is increased with temprature rise.However,the maximum enrichment of strontium in the liquid phase during evaporation of Sichuan Pingluoba underground brine is less affected by temperature,especially when SrCl2·2H2O is precipitated.
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