热驱动煤矸石碳氧化过程及产物土壤性能研究  

Study on carbon oxidation process of coal gangue driven by heat and soil properties of its products

作　　者：胡寒 张清 谢迩嫚 张鑫广 宋浩然 田森林[1] 胡学伟[1] HU Han;ZHANG Qing;XIE Er-man;ZHANG Xin-guang;SONG Hao-ran;TIAN Sen-lin;HU Xue-wei(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,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,云南昆明650500 [2]云南省煤炭产业集团有限公司,云南昆明650231

出　　处：《中国环境科学》2024年第10期5670-5677,共8页China Environmental Science

基　　金：云南省重点研发计划项目(202303AC100007);国家重点研发计划项目(2023YFC3708103);四川省区域创新合作资助项目(2022YFQ0081)。

摘　　要：针对煤矸石本身所含的碳基矿物,本研究对煤矸石进行中低温微氧化,研究温度、时间对碳基矿物转化效率的影响,阐明煤矸石所含碳基组分向腐殖质转化的过程机理.研究表明,中低温(150~180℃)氧化1~3h后,煤矸石热氧化产物中溶解性有机碳含量提升20倍以上,由8.76mg/L提升至176.72mg/L,有机碳比例可提升5倍,由1.2%提升至6%以上,有机质养分水平类似土壤普查养分分级中的1级土.有机碳提升的原因是热氧化过程使碳基矿物的C-C、C=C键向C=O键转变形成羧基、羟基等官能团,碳基矿物发生氧解向富里酸等腐殖类物质转化.腐殖酸含量的提升可有效改良煤矸石风化产物的保墒及团聚性能,使产物持水率超过砂质土壤标准,从而显著提升冬牧70的生物量.This study focused on the carbon-based minerals contained within coal gangue and subjected them to low-temperature thermal oxidation to investigate the effects of temperature and time on the conversion efficiency of these minerals and to understand the process by which the carbon-based components in coal gangue were converted into humus.After undergoing 1-3 hours of oxidation at medium and low temperatures(150~180℃),the dissolved organic carbon content of the coal gangue thermal oxidation products increased by more than 20times,from 8.76mg/L to 176.72mg/L.The proportion of organic carbon also increased fivefold,from 1.2%to over 6%,and the level of organic matter nutrients became comparable to that of grade 1soil as classified in soil survey nutrient categories.The enhancement in organic carbon content was attributed to the thermal oxidation process,which transformed the C-C and C=C bonds of the carbon-based minerals into C=O bonds,resulting in the formation of carboxyl and hydroxyl groups,as well as other functional groups.The carbon-based minerals underwent oxygen hydrolysis,leading to their transformation into humic substances such as fulvic acid.The increase in fulvic acid content was shown to effectively improve the moisture retention and aggregation performance of the coal gangue weathering products,enabling the products'water retention to exceed the standard for sandy soil and significantly boosting the biomass of winter pasture by 70%.

关 键 词：热驱动 煤矸石 碳基矿物 腐殖化 土壤性能提升 

分 类 号：X752[环境科学与工程—环境工程]