Magnesia is generally derived from the mineral magnesite or from magnesium salts in seawater and some naturally occurring brines. 氧化镁一般来源于菱镁矿，或者来源于海水以及其他天然存在的盐水中的镁盐。
The article introduces the determination and computing method of basicity of the polysalt like polymeric aluminum ferric-calcium magnesium salt flocculants. 本文介绍了多元盐如复合铝铁钙镁盐絮凝剂盐基度的测试及其计算方法。
