摘要
文章以磷矿采选废弃物浮选尾砂、重选尾泥为细骨料,以磷尾矿为粗骨料,和水泥制备胶结充填材料。在料浆质量比为85%、水泥质量比为7%的情况下,研究添加不同掺量尾砂、混合添加尾砂和尾泥对胶结充填材料流动性、稳定性及力学强度性能的影响。结果表明:随着尾砂掺量的增加,坍落度、扩散度及稠度总体上都呈先增加后减小的趋势,泌水率呈逐渐减小趋势,分层度呈先增大后减小趋势,抗压强度呈逐渐增大的趋势;当混合添加尾砂和尾泥的质量占总干质量40%时,随着尾泥掺量增加,坍落度、扩散度、稠度、泌水率、分层度及抗压强度总体上均呈逐渐减小的趋势。综合分析,当细骨料占干质量40%,w(尾砂)∶w(尾泥)为3∶1时,磷尾矿胶结充填材料的各项性能表现良好。
Cemented filling materials were prepared with flotation tailings and gravity tailing mud of phosphate mining waste as fine aggregate,phosphate tailings as coarse aggregate and cement.In the case of slurry concentration of 85%and cement concentration of 7%,the effect of the amount of flotation tailings and mixture of flotation tailings and gravity tailing mud on the slurry fluidity,stability and mechanical properties of cemented filling materials was studied.The results show that with the increase of flotation tailings,the slump,slump flow and consistency of the slurry increase first and then decrease;the bleeding rate gradually decreases,and the delamination increases first and then decreases;the uniaxial compressive strength shows a rising trend.When the mass of flotation tailings and gravity tailing mud accounts for 40%of the total dry weight,with the increase of tailing mud content,the slump,slump flow,consistency,bleeding rate,delamination and uniaxial compressive strength gradually decrease.Taking above aspects into account,when the fine aggregate accounts for 40%of dry weight and the mass ratio of flotation tailings(w)and gravity tailing mud(w)is 3∶1,the performance of cemented filling materials with phosphate tailings is well.
作者
张倓
李延杰
胡传宇
梅甫定
黄湛煐
周克清
ZHANG Tan;LI Yanjie;HU Chuanyu;MEI Fuding;HUANG Zhanying;ZHOU Keqing(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2018年第7期973-977,共5页
Journal of Hefei University of Technology：Natural Science
基金
湖北省自然科学基金青年基金资助项目(2017CFB315)
关键词
磷尾矿
浮选尾砂
重选尾泥
胶结充填
混合骨料
phosphate tailings
flotation tailings
gravity tailing mud
cemented filling
mixed aggregate
