硫酸钾盐析法加工分离钠镁矾技术研究

Processing bloedite by potassium sulfate salting out method

钠镁矾类矿物在我国储量十分丰富,对其加工分离和高效综合利用具有重要意义。基于0时Na_(2)SO_(4)-MgSO4-K_(2)SO_(4)-H_(2)O四元体系相平衡特征,研究硫酸钾盐析法加工分离钠镁矾技术。设计以白钠镁矾和硫酸钾为原料生产钾镁复合肥和硫酸钠的技术:0时白钠镁矾溶于水,反应平衡后可直接得到硫酸钠,剩余母液加入硫酸钾可生成钾镁复合物用作农用复合肥,剩余母液返回原液中可实现循环生产。工艺计算得出:硫酸钠和硫酸镁的一次收率分别可达82.79%和50.19%。该技术为钠镁矾资源综合利用提供了理论依据和数据支持。

Astrakanite resources are rich in the northwest of China,and it is of great significance to process and utilize them efficiently and comprehensively.Based on the phase equilibrium characteristics of Na_(2)SO_(4)-MgSO_(4)-K_(2)SO_(4)-H_(2)O quaternary system at 0℃,the technology of processing and separating bloedite by potassium sulfate salting-out method was studied.The technology of producing potassium-magnesium compound fertilizer and sodium sulfate was proposed using bloedite and potassium sulfate as the raw materials,and the process calculation was carried out.Sodium sulfate was produced when reaching phase equilibrium in aqueous solution of bloedite at 0℃.Then potassium-magnesium compound was precipitated by adding potassium sulfate into the mother solution,which can be used as a compound fertilizer for agriculture.The remaining solution can be recycled back to the original liquid for continuous production.According to process calculations:the primary yield of sodium sulfate and magnesium sulfate can reach 82.79%and 50.19%respectively.A theoretical basis and data support for the comprehensive utilization of bloedite resources was provided.