脱硫石膏重结晶过程控制生长高纯硫酸钙晶须  

Controlled growth of high-purity calcium sulfate whiskers from FGD gypsum by recrystallization method

作　　者：王钢领[1] 冯欣[1] 苗苗[1] 时雯[1] 施利毅[1] 

机构地区：[1]上海大学纳米科学与技术研究中心,上海200444

出　　处：《现代化工》2014年第4期61-65,共5页Modern Chemical Industry

基　　金：上海市科委自然基金(13ZR1415100);上海市科委基础研究领域项目(13JC1402700);上海浦东新区科技发展基金(PKJ2012-C05);上海高校青年教师培养资助计划(B.37-0407-12-005)

摘　　要：利用硫酸钙在盐酸溶液中溶解结晶特点,采用重结晶技术对脱硫石膏进行提纯处理,并通过溶解结晶过程控制实现硫酸钙晶须的可控生长。研究了固液比、盐酸浓度、反应温度、反应时间等工艺条件对脱硫石膏成分和颗粒级配的影响,经重结晶技术制备的硫酸钙晶须白度值由44.7%提高至94.5%,纯度达99%以上。在氯化镁、KH570、油酸等媒晶剂的结构导向作用下,优化结晶时间制备了形貌规整、高长径比的硫酸钙晶须。Recrystallization method is used to prepare high-purity calcium sulfate whiskers （CSW） at ambient pressure with desulphurized gypsum （FGD gypsum） as raw material.This technique has played great roles in purification and improving particle size distribution of FGD gypsum.Several factors which affect the quality of product are investigated such as the solid-to-liquid ratio,hydrochloric acid concentration,reaction temperature and time.The chemical analysis indicates that the purity and whiteness of CSW can reach above 99％ and 94.5％,respectively.The CSW with regular morphology and high length-diameter ratio are successfully prepared using magnesium chloride,KH570 and oleic acid as medium crystal agents in optimization crystallization time,respectively.

关 键 词：脱硫石膏 硫酸钙晶须 重结晶 媒晶剂 

分 类 号：TQ343[化学工程—化纤工业]