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采用等压法测定了 2 98.15K下Li Mg Cl borate H2 O体系离子强度范围为 0 .0 5 81～ 0 .63 2 0mol·kg-1,MgCl2 不同离子浓度分数的等压摩尔平衡浓度、水活度 ,计算了Li2 B4O7和MgCl2 混合溶液的饱和水蒸汽压、渗透系数等热力学性质 .考虑了在不同的总硼浓度范围的硼酸 (H3 BO3 )和硼氧配阴离子 [B(OH) -4,B3 O3 (OH) -4,B4O5(OH) 2 -4]的不同生成反应平衡 .由实验结果对修正的Pitzer渗透系数方程进行了参数化研究 ,提出了一简化的参数化模型 ,减少了模型的经验参数量 ,获得了锂、镁、氯离子与硼物种组合之间、及不同硼氧配阴离子之间的组合相互作用参数 ,用该模型计算的渗透系数值与实验结果取得合理的一致性 ,从而将离子作用模型扩展到对含硼、锂、镁的复杂体系的表述 .对完善含锂、硼的盐湖卤水体系的热力学模型和盐湖资源的综合开发利用具有重要意义
The isobaric molar equilibrium concentration of MgCl 2 at different ion concentration was determined by the isobaric method. The ionic strength of Li MgCl borate H 2 O at 2 98.15 K ranged from 0.081 1 to 63.0 mol kg -1. Activity and calculated the saturated water vapor pressure and permeability coefficient of Li2B4O7 and MgCl2 mixed solution.The thermodynamic properties of boric acid (H3BO3) and borohydride anions [B (OH) -4 , B3 O3 (OH) -4, B4O5 (OH) 2 -4] .The parameterization of modified Pitzer’s permeability coefficient equation is studied from the experimental results, and a simplified parametric model is proposed to reduce the Model, we get the parameters of the interaction between the lithium, magnesium, chloride and boron species and the interaction between different boron and oxygen anions. The permeability coefficient calculated by this model is in reasonable agreement with the experimental results , So that the ion action model is extended to the complex system containing boron, lithium and magnesium.It is of great significance to perfect the thermodynamic model of salt lake brine system containing lithium and boron and the comprehensive development and utilization of salt lake resources