磷石膏制备硫酸钙晶须的工艺研究  

Preparation of Calcium Sulfate Whiskers from Phosphorus Gypsum

作　　者：周华锋[1] 张肖肖[1] 李响[1] 

机构地区：[1]沈阳化工大学应用化学学院,沈阳110142

出　　处：《硅酸盐通报》2017年第6期2090-2094,共5页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省自然科学基金(2014020139)

摘　　要：采用常压酸化法对磷石膏分别进行硫酸除杂和盐酸溶解,将磷石膏中的钙富集于溶解液中。再对溶液进行处理制备硫酸钙晶须,考察硫酸钙初始浓度、结晶温度及添加助晶剂种类和用量对硫酸钙晶须组成、结构和形貌的影响。实验结果表明:所制晶须均为二水硫酸钙晶须;以乙醇作为助晶剂所制备的晶须形貌最好。当乙醇的添加量为15 m L(即V_(乙醇)∶V_(盐酸)=1∶2)时所制备的晶须比较均一,平均直径为25μm,平均长径比约为80。The phosphate gypsum was dissolved in sulfuric acid solution to remove the impurities and then the insoluble solid was dissolved in hydrochloric acid at normal pressure, the calcium in the phosphorus gypsum was enriched in the solution. The calcium sulfate whiskers were prepared by treating the solution. The effects of initial concentration of calcium sulfate, crystallization temperature, the types and amount of crystallization promoting agents op the content, structure and morphology of calcium sulfate whiskers were investigated. The results show that the whiskers are calcium sulfate dihydrate; Ethanol is the best crystallization promoting agent ; The uniform whiskers with diameter of 25 μm, aspect ratio of about 80 is prepared when the amount of ethanol is 15 mL（ Vethanol： Vhydrochloic acid = 1： 2）.

关 键 词：磷石膏 常压酸化法 硫酸钙晶须 晶型助长剂 

分 类 号：TQ132.32[化学工程—无机化工]