硫酸镁在氯化物溶液中的结晶平衡

Crystalline Equilibrium of Magnesium Sulfate in Chloride Solutions

研究了氯化物溶液体系中不同条件下与硫酸镁晶相平衡的Mg2+浓度的变化规律。试验结果表明:在75℃条件下形成硫酸镁结晶并达到平衡时,溶液中Mg2+浓度随H+、Fe3+浓度升高和SO2-4在阴离子中占比增大而降低;Fe3+浓度超过0.5mol/kg时,平衡固相为MgSO_4·H_2O和FeH(SO_4)_2·4H_2O的混合物;Fe^(3+)低于0.5mol/kg时,平衡固相为MgSO_4·H_2O。

The changing rule of magnesium ions concentration equilibrating with crystal magnesium sulfate in chloride solution systems at different conditions was studied. The results show that the Mg2＋ concentration decreases with increasing of H＋ ,Fe3＋ concentration and the certain proportion of SO4 2- in the total anion at 75℃. The crystalline products are the mixture of MgSO4 · H2O and Fell （SO4）2 · 4H2O when the Fe3＋ concentration is over 0. 5 mol/kg. At the conditions of Fea＋ concentration less than 0.5 mol/kg,however ,the equilibrium solid phase is pure MgSO4 · H2O.