煤矿安全2024，Vol.55Issue(12)：22-30,9.DOI:10.13347/j.cnki.mkaq.20240615
多源煤基固废制备矿用充填胶凝材料研究
Experimental study on preparation of mine-used filling cementitious material from multi-source coal-based solid wastes
摘要
Abstract
In order to reduce the cost of coal mine filling and mining,and achieve the synergistic utilization of multi-source coal based solid waste,special filling cementitious material is prepared using solid waste such as fly ash,gasification slag,and desulfuriz-ation gypsum as the main raw materials.By conducting orthogonal test,the optimal ratio of each component in the cementitious ma-terial was determined,and the Tesser five-step method was used to study the occurrence and leaching characteristics of heavy metal elements in the cementitious material.The results show that the optimal ratio of cementitious material,fly ash∶furnace bottom ash∶gasification slag∶cement clinker∶desulfurization gypsum∶quicklime,is 39.1%∶23.4%∶15.6%∶10.9%∶4.7%∶6.3%;after curing for 7 days,the hydration products mainly exist in the form of needles and are connected by flocculent and filamentous products;the curing age reaches 28 days,and the hydration products mainly exist in the form of clumps or blocks.The hydration products bind tightly,and the net slurry strength of the cementitious material reaches 1.83 MPa and 2.44 MPa at 7 and 28 days,re-spectively.The filling cementitious material prepared from solid waste such as fly ash can effectively solidify heavy metals and has no risk of heavy metal pollution to the underground environment.关键词
胶凝材料/煤基固废/充填开采/重金属元素/正交试验Key words
cementitious material/coal-based solid waste/filling mining/heavy metal element/orthogonal test分类
矿业与冶金引用本文复制引用
刘志飞,吴维,毕忠伟,付兴玉,郎叶青,侯清利,贾新果..多源煤基固废制备矿用充填胶凝材料研究[J].煤矿安全,2024,55(12):22-30,9.基金项目
国家自然科学基金资助项目(52204138) （52204138）
煤炭科学技术研究院有限公司技术创新基金资助项目(2022CX-Ⅱ-03) （2022CX-Ⅱ-03）
