利用原状脱硫石膏制备高强耐水新型建材.pdf

第36卷第2期
非金属矿
Vol 36 No. 2
2013年3月
Non-metallic Mines
March. 2013
利用原状脱硫石膏制备高强耐水新型建材
林海燕旧勇福郭献军王晓峰
(洛阳理工学院材料科学与工程系,河南洛阳471023)
摘要以原状脱硫石膏、拜尔法赤泥、矿渣等为主要原料,水泥熟料作为激发剂,制备高强耐水建筑试块,研究自然养护和75℃高温养护条
件下试块的抗压强度及耐水性。结果表明,水泥熟料的加入促进了石膏胶凝材料的水化速度,自然养护和蒸汽养护下,试块都具有較高强度,14d
抗压强度均大于20MPa;75℃高温养护明显促进了胶凝材料体系的水化进程。石膏胶凝试块软化系数高,耐水性良好;自然养护条件下,随着水
泥熟料用量的增加,二次钙石生成量增大,软化系数降低,耐水性变差;高温养护早期水化充分,强度較高,且二次钙矾石生成较少,试块软化系
数稳定且保持较高水平。
关键词原状脱硫石膏高强耐水石膏胶凝材籵二次钙矾石
中图分类号:TQ173*75;TU522-36文献标识码:A文章编号:100080982013)02-0054-03
Preparation of High-strength and Water-resistant New Buiding Materials by FGD Gypsum
Lin Haiyan Yang Yongfu Guo Xianjun Wang Xiaofeng
(Department of Material Science and Engineering, Luoyang Institute of Technology, Luoyang, Henan 471023
Abstract The high strength and water resistant blocks were produced from FGD gypsum, Bayer red mud, slag and cement clinker, and
compressive strength and water resistance under the natural conservation and 7C steam curing condition were studied. The results showed that the
gypsum cementitious material hydration speed was promoted when cement clinker was added. Whether natural or steam maintenance, blocks have
higher strength, compressive strength of 14 d is above 20 Mpa. The cementitious material hydration process is promoted evidently on steam curing
condition. The softening coefficient of gypsum cementitious bloek is high, and water resistance is very good. On natural curing condition, delayed
ettringite formation is increasing with the increase of the content of cement clinker, but softening coefficient and water resistance decreases. On steam
curing condition, early ation is y ficin, and omei en h is i he delayed ettringite formation is less, the softening coefficient is
high and stable
Key words FGD gypsum high strength and water resistant gypsum binding material delayed ettringite
脱硫石膏是火电厂进行烟气脱硫过程中产生的
实验部分
一种以二永硫酸钙为主要成分,含有一定量杂质和附1.1原料脱硫石膏取自洛阳首阳山电厂,含水量
着水的工业废渣。随着火电厂脱硫装置的安装、运行,201%;拜尔法赤泥取自郑州铝业有限公司,pH值为
脱硫石膏排放量越来越大,堆存对周边环境造成严重13,碱度较大,AlO含量较高;矿渣磨细后比表面积
污染。目前我国脱硫石膏主要用于生产建筑材料り明。大于等于450m2kg,具有很高的潜在活性;水泥熟料
由于脱硫石膏中附着水含量较高,原状脱硫石膏在运取自洛阳黄河同力水泥厂,磨细过008m筛备用。
输、储存、计量等方面存在诸多不便,需经造粒、干燥各原料的化学成分见表1。脱硫石膏与拜尔法赤泥
等工序オ能应用,增大了利用成本。生产建筑石膏粉,的XRD分析表明,脱硫石膏主要成分为二水硫酸钙,
必须使用专用石膏干燥煅烧脱水设备,生产1t半水石拜尔法赤泥主要成分为水化石榴石和赤铁矿。
膏需耗用约60kg标准煤和35kWh电,设备投资大
表1原料化学成分/%
生产费用高“0。本实验直接利用原状脱硫石膏制备
原料
Sio2 Al]O; Fe20; Cao SO, Mgc
高强耐水石膏基胶凝材料,免去烘干、煅烧等工序,筒原状脱硫石膏1820.3902031244.80064
化工艺流程,降低生产成本,以期实现原状脱硫石膏拜尔法赤泥2488195515962246
在新型建材中的广泛应用。
矿渣
33.8214.441.4440.740.230.36
水泥熟料21.655.272.9563.772.553.70
收稿日期:2013-01-28
基金项目:河南省科技斤资助项目(092300410128)。
12仪器设备J-5型水泥胶砂搅拌机;混凝土振动