Direct transformation of FGD gypsum to calcium sulfate hemihydrate whiskers:Preparation,simulations,and process analysis

作     者：Miao Miao Xin Feng Gangling Wang Shaomei Cao Wen Shi Liyi Shi 

作者机构：Nano Science and Technology Research CenterShanghai University 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第2期

页      面：53-59页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the Shanghai Foundation of Excellent Young University Teachers the Science and Technology Commission of Shanghai Municipality(13ZR1415100,13JC1402700,14195800600) the Science and Technology Development Fund of Pudong New Area(PKJ2012-C05) 

主　　题：FGD gypsum Calcium sulfate Whisker Direct transformation Simulation analysis 

摘      要：Calcium sulfate hemihydrate （CSH） whiskers were synthesized by phase transition in CaCl2 solution under atmospheric pressure. Analytical-grade calcium sulfate dihydrate （AR CSD） was used as the raw material for the synthesis of CSH whiskers, according to orthogonal experiments. The effects of reaction tem- perature, AR CSD content, H2SO4 content, and reaction time were investigated, and the crystallization conditions were optimized. The as-prepared CSH whiskers displayed a regular morphology and a highly uniform size, with an aspect ratio of 105, A simulation system was also established by blending various sulfates with AR CSD, to evaluate the effects of impurities in flue gas desulfurization （FGD） gypsum. The main aim was to prepare CSH whiskers directly from FGD gypsum, without any purification, using the optimized conditions. This is a facile potential alternative process for large-scale production of CSH whiskers using abundant FGD gypsum as source materials.