硬石膏煅烧-酸浸提增白技术的研究  

Research on the technology of uniting calcining with acid-leaching for anhydrite

作　　者：付彦林[1] 李博[1] 崔鹏[1] 

机构地区：[1]合肥工业大学化学工程学院,可控化学与材料化工安徽省重点实验室,安徽合肥230009

出　　处：《应用化工》2012年第1期16-18,22,共4页Applied Chemical Industry

基　　金：国家自然科学基金项目(20876030)

摘　　要：利用煅烧-酸浸提增白技术对安徽含山硬石膏原矿进行增白研究,考察了煅烧时间和温度、煅烧添加剂及用量、浸提酸浓度及温度等因素对石膏白度的影响。结果表明,优化增白工艺条件为:煅烧温度为800℃,煅烧时间为2 h,煅烧添加剂为NH4Cl,添加量为5%,浸提酸浓度为0.6 mol/L,浸提温度为70℃。可将硬石膏原矿白度从86.8%提高到100.8%。Anhydrite of Hanshan in Anhui was studied by acid-leaching method.The effect of calcining time and temperature,calcined additives and the added amount,acid concentration and leaching time on whitening process were investigated.The optimized process conditions were obtained as follows：calcining temperature 800 ℃,calcining time 2 h,NH4Cl was selected as calcined additives and 5% on better,acid concentration was 0.6 mol/L,leaching temperature was 70 ℃.The whiteness of anhydrite was improved from 86.8% to 100.8%.

关 键 词：硬石膏 煅烧 酸浸提 增白 

分 类 号：TQ177.37[化学工程—硅酸盐工业]