机械活化对石煤提钒尾渣制备地聚物性能的影响

发布时间：2018-11-08 19:37

【摘要】：以石煤提钒尾渣为主要原料制备地聚物,不仅能减轻尾渣堆积造成的环境污染,还可以实现尾渣的二次利用,且与传统地聚物制备工艺相比,能耗大幅降低。对湖北某石煤提钒尾渣进行机械活化后制备地聚物试验,结果表明:随着尾渣粒度的减小,尾渣比表面积增大,尾渣中活性硅+铝浸出浓度提高;随着尾渣活化时间的延长,所制备的地聚物抗压强度逐渐提高;降低尾渣的粒径,有利于提高地聚物的物理性能和改善地聚物的微观结构;当尾渣与偏高岭土的质量比为7∶3,NaOH和Na_2SiO_3的掺量均为13%、胶砂比为1∶1、液固比为0.15时,尾渣活化420 s所制备的地聚物28 d抗压强度达到25 MPa。试验结果为以石煤提钒尾渣为原料绿色高效制备地聚物提供了依据。
[Abstract]:Using vanadium residue from stone coal as the main raw material to prepare the polymer can not only reduce the environmental pollution caused by the accumulation of the tail slag, but also realize the secondary utilization of the residue, and the energy consumption is greatly reduced compared with the traditional geopolymer preparation process. After mechanical activation of vanadium tailings from a stone coal in Hubei Province, the results showed that the specific surface area of the slag increased and the leaching concentration of active silicon and aluminum increased with the decrease of the size of the tailings. With the prolongation of activation time, the compressive strength of the prepared polymer increases gradually, and the decrease of the particle size of the residue is beneficial to the improvement of the physical properties and the microstructure of the geopolymer. When the mass ratio of tail-slag to metakaolin is 7: 3% NaOH and Na_2SiO_3 is 13%, the ratio of cement to sand is 1: 1, and the ratio of liquid to solid is 0.15, the compressive strength of the polymer prepared by activated 420s of tail slag reaches 25 MPa. in 28 days. The experimental results provide a basis for the green and efficient preparation of polymer from vanadium tailings from stone coal.
【作者单位】：武汉理工大学资源与环境工程学院;武汉科技大学资源与环境工程学院;矿物资源加工与环境湖北省重点实验室;
【基金】：国家自然科学基金项目(编号:51404177)
【分类号】：TQ177

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