N water present in the crystals of certain compounds. It is chemically combined in stoichiometric amounts, usually by coordinate or hydrogen bonds, but can often be easily expelled 结晶水
Second step , the nanometer tin dioxide powder aspects are gone except the water of crystallization system by the way of hydrothermal.
第二步，利用水热脱水法去除凝胶中的结晶水制得纳米二氧化锡粉体。
If crystallization occurs, use water bath heating to dissolve it, which will not affect the performance of product.
发生结晶时只需用水浴加热溶解，不影响使用效果。
It introduces the methods of recovering waste acid and water with waste acid and oily impurity using the natural cooling crystallization, the dialyzing diffusing and roasting.
介绍用自然冷却结晶法、 渗析扩散法和焙烧法回收废酸及合废酸、含石油类杂质废水的处理方法。
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