煤矿新型胶凝充填材料配比试验及水化机理研究  

Study on proportioning test of a new cementing filling material and hydration mechanism

作　　者：杨宝贵[1] 杨捷[1] 于跃[1] 李多[1] 蒋斌[1] 程坤[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《矿业科学学报》2017年第5期475-481,共7页Journal of Mining Science and Technology

基　　金："十一五"国家科技支撑计划(2009BAB48B02)

摘　　要：针对新阳煤矿充填开采,利用粉煤灰、石灰、脱硫石膏等固体废弃物加少量水泥进行新型充填胶凝材料强度试验研究,采用正交试验法确定煤矿新型胶凝材料中水泥、石灰、脱硫石膏和粉煤灰的最佳配比。借助XRD衍射仪和扫描电镜(SEM)研究新型充填胶凝材料的水化机理,揭示了不同龄期胶凝材料的水化产物类型与微观发育形态,最后以该胶凝材料与煤矸石和水按一定比例混合制备充填料浆,并与相同质量浓度下的高浓度胶结充填料浆性能进行对比。结果表明:煤矿新型胶凝材料的最佳配比为水泥∶石灰∶脱硫石膏∶粉煤灰=10%∶1.8%∶9%∶79.2%;新型胶凝材料养护龄期3 d时,水化产物主要以针状存在,通过团絮状、丝状产物相联结;养护龄期到达28 d时,水化产物间主要以团状、块状或成片状物质形式存在,水化产物黏结得较紧密;相同质量浓度下,新型充填材料和高浓度胶结充填材料相比,尽管强度和泌水率等指标略低,但已经满足新阳煤矿充填开采的要求,并极大地降低了胶凝材料的成本。The strength of the new filling cementing material which is mixed by fly ash,lime,desulfurization gypsum and a small amount of cement is tested in order to apply to backfill mining in Xinyang coal mine.The optimum ratio of cement,lime,desulfurization gypsum and fly ash in coal mine is determined by orthogonal test method.Hydration mechanism of new filling materials is studied by the XRD and electron microscope scanning(SEM).The types of hydration products and the micro development form of cementitious materials at different ages are revealed.Finally a new type of backfilling cementing material is invented by mixing cementitious materials,coal and water and it's characteristics is compared with previous version.The results show that the best ratio of new cementing material for coal mine is Cement ∶ Lime ∶ Desulfurization gypsum ∶ Fly ash = 10% ∶ 1.8% ∶ 9% ∶ 79.2%;The main presence of hydration products is needle,linked through flocculent filamentous product when the curing age of the new cementing material is 3 days;The main forms of the hydration products are clusters,blocks or patches,and hydration products were closely bonded when the curing period reached 28 days;It was found that the new filling material can greatly reduce the cost of the cementitious material and apply to the requirement of filling mining in the Xinyang coal mine despite the intensity and bleeding rate and other indicators decreased slightly through comparing new type of backfilling cementing material with the high concentration of cemented filling materials at the same concentration.

关 键 词：新型胶凝充填材料 正交试验 水化产物 微观发育形态 高浓度胶结充填材料 

分 类 号：TD823.7[矿业工程—煤矿开采]