Fe^(3+)、Al^(3+)、Mg^(2+)对石膏结晶习性影响的研究

The Effects of Fe 3+ ,Al 3+ and Mg 2+ on the Crystal Habits of Gypsum

本文在ＭＳＭＰＲ结晶器中研究了无Ｆ－存在下，Ｆｅ３＋、Ａｌ３＋、Ｍｇ２＋三种离子共存时对石膏结晶习性的影响，结果发现，无论硫酸根过量２．４％还是过量４．８％，Ｆｅ３＋、Ａｌ３＋、Ｍｇ２＋共存得到的石膏晶体几乎都是针状晶体；当硫酸和另两种相应的离子浓度保持一定水平时：增大Ｆｅ３＋含量，石膏晶体变长；增长Ｍｇ２＋含量，石膏晶体变小；增长Ａｌ３＋含量，石膏晶体长大。Ｆ－与Ａｌ３＋同时存在有利于石膏聚晶的形成。

The effects of Fe 3+ ,Al 3+ and Mg 2+ on the crystal habits of gypsum in wet phosphoric acid in the absence of F - were studied in a continous MSMPR crystallizer.The results of the experiments showed that the crystals of Gypsum were of meedle shape no matter whether the free excess of SO 2- 4 was 2 4% or 4 8%.When the concentrations of SO 2- 4 and the other two corresponding impurities were kept constant,the crystal length of gypsum increased with the increase of Fe 3+ content;the crystal size of gypsum decreased with the increase of Mg 2+ content and increased with the increase of Al 3+ content.The presence of F - and Al 3+ would promote the formation of aggregating crystal.