一种元明粉的精制方法
本发明涉及一种元明粉的精制方法,属于无机化工提纯技术领域。该方法以采自矿点的天然芒硝为起始原料,依次经溶解过滤除杂、复合沉淀剂碱性沉淀、螯合树脂离子交换、膜蒸馏浓缩、硅烷偶联剂改性十水硫酸钠晶种诱导冷却结晶及干燥脱水步骤,制备得到高纯元明粉。本发明通过将化学沉淀、氧化降解、离子交换、物理吸附、低温膜浓缩与表面改性诱导结晶技术有机衔接,实现了对天然芒硝中黏土矿物、钙镁铁离子及微量有机物和色素的逐级协同脱除,所得产品纯度高、白度好,工艺过程能耗低、绿色环保,适宜工业化应用。
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