Method for preparing calcium sulfate whisker with high length-diameter ratio from industrial byproduct gypsum through secondary hydrothermal method

The invention discloses a method for preparing calcium sulfate whiskers with a high length-diameter ratio from industrial byproduct gypsum through secondary hydrothermal treatment. The method comprises the following steps: firstly, grinding and screening industrial byproduct gypsum, and preparing the calcium sulfate whisker with high length-diameter ratio by adopting an acid-free process of primary hydrothermal-gravity classification-secondary hydrothermal. The calcium sulfate whisker prepared by the method is uniform in morphology, good in dispersity and relatively high in length-diameter ratio. On the premise of not using other chemical additives, impurity removal of the industrial byproduct gypsum is realized, the calcium sulfate whisker with the high length-diameter ratio is prepared, and the method is simple to operate, green and environment-friendly. 本发明公开了一种由工业副产石膏二次水热制备高长径比硫酸钙晶须的方法。首先对工业副产石膏进行研磨筛分，采用一次水热-重力分级-二次水热的无酸工艺制备得到了高长径比硫酸钙晶须。该方法制得的硫酸钙晶须形貌均匀、分散性好，有较高长径比。本发明在不使用其他化学添加剂的前提下，实现了工业副产石膏的除杂，并制备了高长径比的