掺杂作用与HW模型在掺杂作用研究中的应用

MIXATION OF NATURAL WATERS AND THE APPLICATION OF HW-MODEL TO THE STUDY OF MIXATION

本文通过对察尔汗盐湖掺杂现象的研究,证明了掺杂是一种重要的地质作用。文章引用了最新的电解质溶液理论来研究掺杂作用,从而可以判断室温条件下两种或两种以上的水掺杂时会发生什么反应,初步解决了掺杂作用的研究方法问题。

Mixation of natural waters is a widespread geological phenomenon of physi-cochemical reactions that take place when natural waters of different compositions mix one another under geological settings. 'Chanza' plays a very important rolein the evolution of natural waters, the formation of salt deposits and even the exploiting of salt lakes. Qarhan Saline Lake (QSL ) in Qaidam Basin is known as 'natural lab. ' for the study of salt deposits. Frequent mingling of brines of different compositions resulted in salting out of gypsum, halite, carnallite and other minerals, and in the change of brine compositions exerted a great influence on the evolution of the lake and the formation of potash. In the process of expoi-ting of the lake, mixation of brines may lead to unexpected dissolving and crystallizing activities that in turn harm or benifit production. It is of very important economical value to predict the dissolution and crystallization before we make any plan to let brines mix in a optimum way for production. Emphasis is made on the application of HW-model, a model of highly non-ideal multiphase electrolyte solutions based on Pitzer theory, to the study of mixation of natural waters. Field observations, lab. work and computer simulating consistently indicate that HW-model constitute the best approach to the study of mixation. Our computer program can predict what kind of physicochemical reaction will happen when two brines or waters mix, with the result coinciding with field observations and experiments very well.