钙芒硝盐岩溶解的温度效应

Temperature Effect of Glauberite Salt Rock Dissolution

钙芒硝盐岩化学成分为硫酸钠与硫酸钙的化合物,其化学成分的复杂性决定了其属于难溶性盐。溶解机理分析发现,其溶解过程包括硫酸钠和硫酸钙的溶解与其结晶,但硫酸钙结晶后会形成一层膜覆盖在矿物表面,减少溶解表面面积,对硫酸钠的溶解有抑制作用。实验发现,钙芒硝的溶解具有温度效应：温度越高使溶解速率及溶解速度下降越迅速,使钙芒硝溶解变慢。压力浸泡溶解开采使现场采出效率提高了30%-40%。

The glauberite salt rock consists chiefly of sodium sulfate and calcium sulfate,the complexity of its chemical constituent determines it belongs to a salt hard to dissolve.By analyzing dissolving machine of glauberite salt rock,it was found that in its dissolving process there are the dissolution and crystallization of sodium sulfate and calcium sulfate,but the crystallization of calcium sulfate will form a layer on the surface of the minerals,resulting in decrease of dissolving surface area and thus producing a inhibiting effect to sodium sulfate dissolution.Through the experiment,itwas found that the dissolution of glauberite shows the effect of temperature,the higher the temperature is,faster the droppings of dissolving speed rate and dissolving speed are,making the dissolution of glauberite change down.In-situ press-dipping solution mining can increase the recovery ratio by 30%-40%.