高镁溶液对光卤石分解影响的初步研究

Preliminary study on effect of high-magnesium solution on carnallite decomposition

光卤石分解过程中,氯化钠在最初低镁的溶液中溶解很快,但随着分解过程的进行,由于氯化镁的溶解速率很快,从而使分解液中氯化钠的饱和度减小,最终使先前溶解的氯化钠又重新结晶析出,这对氯化钾从溶液中结晶析出产生影响。针对这个问题,通过相图计算和分析,加入不同浓度的氯化镁溶液,研究高镁溶液对光卤石分解的影响。结果表明:高镁溶液的加入使钾收率提高近1.1%,分解完后细粒氯化钠的质量分数降低近30%,光卤石分解转化收率提高约1.2%。

Sodium chloride dissolved rapidly in the initial low-magnesium solution during the course of carnallite decompo- sition.With the decomposition process went, as the dissolution velocity of magnesium chloride was so fast that the saturation degree of sodium chloride in the decomposing solution was decreased, the sodium chloride in the previous solution was re- crystallized and the crystallization of potassium chloride was impacted.The effect of high-magnesium solution on carnallite decomposition was discussed by calculating and analyzing phase diagram data through adding magnesium chloride solutions with different concentrations.Results showed that potassium yield was improved nearly by 1.1%, mass fraction of fine sodium chloride was reduced near/y by 30%,and earnallite decomposition rate increased by 1.2% through adding high-magnesium solution.