正交试验法确定低品位钾矿溶解的最佳条件

以青海马海盐矿为原料，采用正交试验法研究盐矿中K+、Na+的溶解规律。一定的溶矿时间后，用正交试验法研究了液固比、溶剂中氯化钠的含量及溶剂中氯化镁的含量这3个素对矿液中K+、Na+含量的影响，并对正交试验的结果做了SPSS分析。3因素对试验结果中K+、Na+含量影响的主次顺序：液固比＞溶剂中氯化钠的含量＞溶剂中氯化镁的含量。实验确定了溶矿的最佳条件：液固比为1∶0.5、溶剂中氯化钠的质量分数为其饱和度的50%、溶剂中氯化镁的质量分数为3%。最佳条件下KCl的质量分数大于1.2%，符合要求，且NaCl的溶解量很小，达到不使盐矿骨架坍塌的要求。

Optimum conditions for dissolution of low grade potassium ore confirmed by orthogonal test

With Mohair salt mine，in Qinghai Province as raw material，the dissolution laws of K+ and Na+ from the salt mine were studied by orthogonal experiments.After a certain time of dissolution mine，the influences of three factors，ratio of liquid to solid，sodium chloride content in the solvent，and magnesium chloride content in the solvent on the contents of  K+ and Na+ in the liquid were investigated by orthogonal test method and the experiment results were analyzed with SPSS. The test results showed the influencing order for K+ and Na+ contents was：liquid to solid ratio>sodium chloride in solvent>magnesium chloride in solvent.The optimum conditions for the mineral dissolution were confirmed as follows：liquid-solid ratio was 1∶0.5，the content of sodium chloride was 50%（mass fraction，and same below） of its saturation in the solvent，the content of magnesium chloride was 3% in the solvent.Under optimal conditions the content of KCl was more than 1.2% which met the relevant requirements，and the small amount of dissolved NaCl also reached the requirements that the salt mine skeleton will not collapse.