添加石煤提钒尾渣对建筑用烧结砖性能的影响  

Influence of Vanadium Tailings from Stone Coal on Sintering Brick for Building

作　　者：张海玲[1] Zhang Hailing(Department of Civil Engineering and Architecture,Hohhot Vocational College,Hohhot,Inner Mongolia,China)

机构地区：[1]呼和浩特职业学院建筑工程学院,内蒙古呼和浩特010070

出　　处：《矿产综合利用》2023年第2期191-196,共6页Multipurpose Utilization of Mineral Resources

基　　金：全国交通运输路桥工程类职业教育教学指导委员会教研课题(LQZZW2018234);内蒙古自治区教育科学“十三五”规划课题(NGJGH2016150)。

摘　　要：本研究以石煤提钒尾渣为原料制备了建筑用烧结砖,研究了石煤提钒尾渣细度及添加量对制品抗压强度及吸水率的影响,采用XRD和SEM表征手段分析了石煤提钒尾渣添加量调控烧结砖相组成与显微结构的机理,检测了制品的抗冻融性与使用安全性。结果表明:提高尾渣细度改善了样品的致密度与抗压强度,引入尾渣使样品的抗压强度先增大后减小。B3样品(尾渣:黏土:粉煤灰=30:30:40)经1150 o C烧成后,其抗压强度≥35 MPa,吸水率小于≤13%,综合性能满足《烧结普通砖》(GB/T 5101-2003)中Mu30的要求。XRD与SEM分析表明,添加15%~30%尾渣有利于生成液相,促进钙长石与钙黄长石的生成,晶粒与液相相互胶结,使制品具有较高的抗压强度与致密度及较好的抗冻融性能。Fired bricks for building were prepared from the tailings of vanadium extraction from stone coal.The influences of fineness and addition of tailing on the water absorption and compressive strength of samples were investigated.The mechanism of tailoring the phase compositions and microstructures of samples by tailing addition was analyzed by XRD and SEM.The freeze-thaw resistance and utilization safety of the products were tested.The results showed increasing the tailing fineness enhanced the microstructure densification and compressive strength,which firstly increased and then decreased after increasing tailing addition.B3 sample(tailings∶Clay∶fly ash=30∶30∶40)fired at 1150℃had the compressive strength of≥35 MPa and the water absorption of≤13%.The comprehensive properties meet the requirements of the Mu30 standard in the《sintered ordinary bricks》(GB/T 5101-2003).XRD and SEM analysis showed that adding 15%~30%tailing was beneficial to the formation of glass phase and promote the production of anorthite as well as anorthosite.Grain and liquid phase are cemented with each other,thus endowing the products with high compressive strength,microstructure densification,and good freeze-thaw resistance.

关 键 词：石煤提钒尾渣 建筑用烧结砖 结构 性能 

分 类 号：TD989[矿业工程—选矿]