【摘要】 采用等温溶解平衡法研究了 2 98K时KCl-K2 CO3 -K2 B4O7-H2 O体系的相平衡及平衡液相物化性质 (密度、粘度、折光率、电导率、pH) ,该体系 2 98K等温溶解度图有 3个相区 :KCl,K2 CO3 ·3/ 2H2 O ,K2 B4O7·4H2 O ,1个共饱点 ,3条单变量曲线 ,该体系属简单四元体系。由渗透系数及三元体系溶解度数据拟合了有关K2 B4O7的Pitzer方程参数 ,并运用Pitzer方程对该四元体系溶解度进行理论计算 ,计算值与实验值基本吻合更多还原

【Abstract】 Solubilities and solution properties (density,refractive index,viscosity,condustivity and pH) of the quaternary system KCl-K 2CO 3-K 2B 4O 7-H 2O at 298 K were studied by isothermal equilibrium method.Based on the solubility data,the phase diagram of the system was plotted,which consists of three univariant curves, one invariant point and three crystallization fields:K 2B 4O 7·4H 2O,K 2CO 3·3/2H 2O and KCl.Ion interaction parameters β (0) ,β (1) ,C φ of K 2B 4O 7 and mixing parameters Ψ K,C,B , Ψ K,Cl,B  were evaluated for Pitzer’s equation by fitting the osmotic coefficients of K 2B 4O 7 and solubilities of ternary systems.The solubilities of the system KCl-K 2CO 3-K 2B 4O 7-H 2O at 298 K were then calculated by Pitzer’s equation and the calculated solubilities are in agreement with the experiment data on the whole.更多还原