Pitzer理论在变温高浓卤水体系地球化学平衡研究中的应用

The Application of Pitzer Theory in the Geochemical Equilibrium Study of High Concentration Brine System with Variable Temperature

中文关键词:  Pitzer理论 地球化学 化学平衡 高浓卤水体系 SMW模型 溶解驱动

英文关键词:Pitzer theory,High concentration brine,Chemical equilibrium,SMW model,Dissolving-driving

中文摘要:

      在描述和计算多组分高浓电解质溶液化学平衡方面，Pitzer理论及其半经验方程体系是迄今为止最有成效的成果。后继研究者以Pitzer理论为基础，建立了较有代表性的HW模型、HMW模型以及SMW模型。针对察尔汗盐湖实际情况，作者选择SMW模型并自行开发出计算程序，通过溶解驱动开采固体钾矿的室内试验所用溶剂的化学平衡计算，分析了各溶剂的溶矿能力，提出溶剂中光卤石不饱和是其溶解固相钾矿的关键所在。综合利用钾肥厂尾液和盐田老卤作为溶解驱动固体钾矿的溶剂在理论上是可行的。

英文摘要:

      Pitzer theory and his semi-empirical equation system are the most effective achievements in describing and calculating the chemical equilibrium of multi-component high concentration electrolyte solution.Successive researchers have built many chemical equilibrium models such as HM model, HMW model and SMW model. For a practice in Qarhan salt lake, the SMW model was selected and its computer program was developed. Based on the chemical equilibrium calculation, the capability of each solvent used in the laboratory experiment for dissolving-driving solid potassium deposit was analyzed. An important conclusion is that the unsaturation of carnallite in a solvent is the key for the pessibility of dissolving solid KCl. It is possible in theory that the mixing of the concentrated saltern brine and the liquid waste of potash fertilizer plant can be a suitable dissolving-driving solvent.