氢氧化钠法提取镁元素的资源化利用研究

Study on resource utilization of magnesium extracted by sodium hydroxide method

基于海水提镁的原理,以反渗透海水淡化后的浓水为原料,采用Na_2CO_3做脱钙剂,改变Na_2CO_3的量,反应时间,反应温度,确定出了最佳脱钙条件并向脱钙母液中滴加NaOH,改变其物质的量、反应温度、反应时间及静置时间,考察其对Mg(OH)_2产率及纯度的影响。

Based on the principle of extraction of magnesium from seawater. The optimum decalcification conditions were determined by using concentrated water after reverse osmosis seawater desalination as raw material,Na2 CO3 as decalcification agent,changing the amount of Na2 CO3,reaction time and reaction temperature. The optimum decalcification conditions were determined as follows： Na OH was added dropwise to decalcified mother liquor,and the effects of Na OH on the yield and purity of Mg（ OH）2 were investigated by changing the amount of the substance,reaction temperature,reaction time and standing time.