摘要
钢渣是一种大宗工业废弃物,由于存在安定性不良的缺点,利用率一直较低。该文将多聚磷酸盐改性钢渣用于蒸压尾矿砖的生产,对影响产品性能的主要因素进行了系统研究,确定了适宜的蒸压砖工艺条件和蒸养制度:成型水量为9%;成型压力为20 MPa;蒸养制度为"升温4 h-180℃恒温4 h-自然冷却降温"。蒸压砖中钢渣粉用量由原来的11%(未改性,未粉磨)提高到25%(改性),水泥用量由原来的7%下降到5%,抗压强度则由11.6 MPa大幅度提高到22.1 MPa,产品满足《粉煤灰砖》(JC 239-2001)标准要求,达到了MU20等级。多聚磷酸盐改性剂除了有效改善钢渣的安定性之外,还对钢渣和尾矿具有良好的活性激发作用,进而强化了蒸压过程中的水化反应。借助XRD和SEM分析了蒸压试块的水化产物及微观结构,探讨了改性钢渣-尾矿蒸压砖的水化与强度形成机理。
Steel slag is a major industrial waste. Because of poor volume stability, its utilization was limited. Polyphosphate modified steel slag and tailings were used to produce the autoclaved brick. The effects of various factors influencing the performance of brick were investigated, and the results were obtained as forming water 9%, forming pressure 20 MPa, curing regime 4 h（temperature rising）-4 h（temperature holding at 180℃）-natural cooling（ temperature dropping）. With the content of steel slag in brick increased from 11% to 25%, the content of cement reduced from 7% to 5%, the compressive strength value increased from 11.6 MPa to 22.1 MPa. The product conforms to JC 239-2001（MU20）. Besides improving the soundness of steel slag, polyphosphate modifier can activate steel slag and tailings effectively, strengthening the hydration reaction of the autoclaved process. The hydration products and microstructure of autoclaved block were analyzed by using Xray spectrometer and electron scanning microscope.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2016年第4期102-106,共5页
Environmental Science & Technology
基金
河北省重点科技支撑计划项目(14273804D)
关键词
钢渣
尾矿
工艺参数
蒸压砖
抗压强度
steel slag
tailings
factors
autoclaved brick
compressive strength
作者简介
李鹏冠（1989-），男，硕士研究生，主要从事固体废弃物资源化利用研究，（电子信箱）564663554@qq．com；
通讯作者，男，教授，博士，主要从事固体废弃物资源化利用研究，（电子信箱）zhaofq3366@126．com。
