拜耳法低铁赤泥在电石渣-脱硫石膏体系中的水化硬化特性  

Characteristics of Hydration and Hardening of Red Mud of Bayer Process in Carbide Slag-Flue Gas Desulfurization Gypsum System

作　　者：刘英[1] 倪文[1] 黄晓燕[1] 马旭明[1] 李德忠 

机构地区：[1]北京科技大学土木与环境工程学院,工业典型污染物资源化处理北京市重点实验室,北京100083 [2]中节能工程技术研究院有限公司,北京100082

出　　处：《材料导报》2016年第14期120-124,共5页Materials Reports

基　　金：国家自然科学基金青年科学基金(51504014)

摘　　要：为促进拜耳法赤泥在胶凝材料中的大宗化和高附加值利用,以山西孝义拜耳法低铁赤泥为研究对象,借助XRD、FTIR、SEM、ICP-OES等现代测试手段,研究了拜耳法赤泥在电石渣-脱硫石膏体系中的水化硬化特性。研究表明,拜耳法低铁赤泥具有潜在活性,氧化铝为其活性的最主要来源,在电石渣-脱硫石膏体系中,通过电石渣的补钙作用和脱硫石膏的促进激发作用,赤泥中的氧化铝得以有效激发,其水化产物主要为钙矾石、C-S-H凝胶、水化硫铁酸钙、钙霞石、无水芒硝和氢氧化铝。In order to promote large quantity and high value-added utilization of red mud from Bayer process in cementitious material, the hydration and hardening characteristics of red mud from Bayer process under the activation of carbide slag and flue gas desulfurization gypsum were investigated with XRD, FTIR, SEM and ICP-OES. The results indicated that the red mud from Bayer process possessed potential activation and the major source of activity was the aluminium oxide. In carbide slag-flue gas desulfurization gypsum system, aluminium oxide was effectively stimulated by the calcium suppliment effect of carbide slag and the activation of flue gas desulfurization gypsum. Ettringite, C-S-H gel, calcium sulfate hydroxide hydrate, cancrinite, thenardite and aluminum hydroxide were formed after hydration reaetions.

关 键 词：拜耳法赤泥 电石渣 脱硫石膏 水化硬化 微观结构 钙矾石 离子浓度 

分 类 号：TD982[矿业工程—选矿]