Mixed additives and method for producing anhydrous dead-burned type of calcium sulfate whisker

一种用于生产无水死烧型硫酸钙晶须的混合添加剂及方法

Abstract

本发明涉及一种用于生产无水死烧型硫酸钙晶须的混合添加剂,属于无机化工材料生产技术领域。本发明所述混合添加剂包括形貌控制剂,辅助控制剂及反应体系pH调控剂,所述形貌控制剂、辅助控制剂、反应体系pH调控剂的质量比为1:0~20:30~70。所述混合添加剂能够加快晶体的生长速度,缩短反应时间,同时实现对晶须形貌的控制,得到高长径比的半水硫酸钙晶须。本发明还涉及生产无水死烧型硫酸钙晶须的方法,以二水硫酸钙、水为和混合添加剂为原料,进行水热反应得半水硫酸钙晶须,然后经过滤、烘干、煅烧、冷却后得硫酸钙含量大于98wt%的无水死烧型硫酸钙晶须,本发明工艺简单、无污染、生产成本低、可操作性强、产品质量高,稳定性好。
The invention relates to a mixed additive for producing an anhydrous dead-burned type of calcium sulfate whisker, and belongs to the technical field of inorganic chemical materials production. The mixed additive of the invention comprises a morphology controlling agent, an auxiliary controlling agent and a reaction system pH controlling agent. The mass ratio of the morphology controlling agent, the auxiliary controlling agent and the reaction system pH modulator is 1:0-20:30-70. The mixed additive can speed up growth of crystals, shorten reaction time, and at the same time can implement control of whisker morphology to acquire high aspect ratio hemihydrate calcium sulfate whisker. The invention further relates to a method for producing an anhydrous dead-burned type of calcium sulfate whisker. The method comprises: using calcium sulfate dihydrate, water and the mixed additive as raw materials, performing a hydrothermal reaction to acquire hemihydrate calcium sulfate whisker; after filtration, drying,calcination and cooling, acquiring the anhydrous dead-burned type of calcium sulfate whisker with calcium sulfate content being more than 98wt%. The invention is simple in process, zero in pollution, low in production cost, high in operability, good in product quality and good in stability.

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Cited By (2)

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