马海盐湖溶采卤水高温梯级蒸发实验研究

针对马海盐湖溶采卤水日晒蒸发制取光卤石（Car）过程中成矿和加工周期长、杂盐含量高、产品质量难以控制的问题，采用高温蒸发的方法制备光卤石，开展梯级蒸发工艺研究。实验结果表明：卤水相对密度为1.367 8时进行固液分离可得到氯化钠质量分数为92.23%的固相产品；卤水相对密度为1.417 5时进行固液分离可得到光卤石品位为64.6%的固相，氯化钾和氯化钠质量的比值达到1.94。在60~85 ℃蒸发，温度对蒸发结晶制备光卤石的固液分离点没有明显影响，但卤水中镁离子的含量对卤水的黏度影响很大。通过梯级蒸发工艺研究，可有效分离光卤石和氯化钠，缩短光卤石的成矿时间。

Study on stepped high temperatrue evaporation of dissolved brine in Mahai salt lakes

Based on the problems，such as long mineralization and processing cycle，high impurity content，and difficult control to product quality，in the production of carnallite from the dissolved brine of Mahai salt lake with solarization process，a high temperature evaporation method was introduced for preparing carnallite and stepped evaporation research was carried out.Results showed solid product containing 92.23%（mass fraction） NaCl could be prepared with solid-liquid separation when the relative density of brine was 1.367 8；carnallite with the grade of 64.6% could be prepared by solid-liquid separation and the mass ratio of KCl to NaCl reached 1.94 when the relative density of brine was 1.417 5.In the range of 60~85 ℃，the temperature had  no significant impact on the solid-liquid separation in the preparation of carnallite，but Mg²⁺ content had a great influence on the viscosity of the brine.Through researching on the stepped evaporation process，carnallite could be separated from sodium chloride effectively and the carnallite mineralization could also be shortened.