基于瓦斯燃烧余热利用的煤矸石快速风化成土  

Rapid weathering and pulverization of coal gangue based on gas waste heat utilization

作　　者：胡寒 谢迩嫚 张清 田森林[1] 胡学伟[1] HU Han;XIE Erman;ZHANG Qing;TIAN Senlin;HU Xuewei(Kunming University of Science and Technology,Faculty of Environmental Science and Engineering,Kunming 650500,China;Yunnan Coal Industrial Group Limited Co.,Ltd,Kunming 650231,China)

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]云南省煤炭产业集团有限公司,昆明650231

出　　处：《环境工程学报》2023年第10期3359-3366,共8页Chinese Journal of Environmental Engineering

基　　金：云南省重点研发计划资助项目(202303AC100007);云南省生态环境厅资助项目(YNJH2019224);四川省区域创新合作资助项目(2022YFQ0081)。

摘　　要：基于瓦斯燃烧的余热利用,对煤矸石进行高频率的干湿/冷热交替处理,加速煤矸石结构风化粉化,提升风化产物的保墒-透气-蓄肥等土壤学性能。结果表明煤矸石在50℃下经30次干湿/冷热交替后粒径显著下降,粗砂(5~10 mm)比例下降43%,细砂(<1 mm)含量上升35%,持水率可达12.78%,达到砂土持水标准,持水率、微粒含量、毛管孔隙度与循环次数呈正比;颗粒粉化主要受矿物溶出产生溶蚀裂隙、矿物重构并干燥产生盐结晶强化裂隙涨裂,以及黏土矿物的不均匀性膨胀/收缩的影响;风化产物种植紫花苜蓿,发芽率在80%以上,发芽时间、茎长等优于低扰动样品。本研究结果可为瓦斯与煤矸石的能源化、资源化协同利用提供参考。Utilizing waste heat generated from gas combustion,this study explored the rapid weathering and pulverization of coal gangue through high-frequency dry/wet/cool/hot alternating treatments.The objective was to enhance the soil properties of the weathered products,including moisture retention,ventilation,and fertilizer storage.Experimental results demonstrated that after 30 cycles of dry/wet/hot/cold alternating treatment at50℃,the particle size of coal gangue significantly decreases,with a corresponding 43%reduction in coarse sand(5~10 mm)content and a 35%increase in fine sand(<1 mm)content.The water holding rate reached12.78%,meeting the standards for moisture retention in sandy soil.Moreover,the water holding rate,particle content,and capillary porosity exhibited a proportional relationship with and number of cycles.Particle pulverization primarily resulted from mineral dissolution,which generated etching cracks,mineral restructuring under dry conditions leading to salt crystallization-induced crack strengthening,and clay minerals'uneven expansion/contraction.Planting alfalfa using the weathered products yielded a germination rate of over 80%,surpassing that of low-disturbance samples in terms of germination time and stem length.This research provides valuable insights for the collaborative utilization of gas and coal gangue,aiming to facilitate their energy and resource co-utilization.

关 键 词：瓦斯 煤矸石 余热利用 风化粉化 矿物溶解重构 

分 类 号：X752[环境科学与工程—环境工程]