基于碳酸盐矿化菌改良煤矸石保水性能的效果研究  

Study on Improvement Effect of Water Retention Properties of Coal Gangue Based on Carbonate Mineralizing Bacterium

作　　者：张衡 张浩宇 徐冉 马浩田 张建林 尚海丽 曹钊 张磊[3] ZHANG Heng;ZHANG Haoyu;XU Ran;MA Haotian;ZHANG Jianlin;SHANG Haili;CAO Zhao;ZHANG Lei(Ordos Tengyuan Coal Co.,Ltd.,Ordos 017000,China;College of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou,014010,China;Ordos Vocational College,Ordos 017000,China)

机构地区：[1]鄂尔多斯市腾远煤炭有限责任公司,内蒙古鄂尔多斯017000 [2]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010 [3]鄂尔多斯职业学院,内蒙古鄂尔多斯017000

出　　处：《煤炭技术》2025年第2期239-244,共6页Coal Technology

基　　金：鄂尔多斯市重点研发计划项目(YF20232342)。

摘　　要：内蒙古自治区煤炭开采区多为生态脆弱区,矿区土壤沙化严重。伴随煤炭开采和开发,煤矸石产生量大,难以消纳,侵占土地,对环境产生严重影响。为了合理利用煤矸石改良矿区沙化土壤,利用一株碳酸盐矿化菌矿化胶结煤矸石颗粒,提高矸石保水性能。采用室内小型蒸发试验,通过田间持水量、BET孔隙和比表面积、扫描电镜联合能谱面扫的分析方法,研究不同菌液量、不同钙离子浓度对煤矸石生物矿化效果的影响。研究结果表明:(1)利用碳酸盐矿化菌进行生物矿化试验能够显著提高煤矸石的保水能力,最佳菌液添加量为田间持水量的40%、最佳胶结液钙离子浓度为1.0 mol/L;(2)与未处理煤矸石相比,M_(1)(40%菌液,1.0 mol/L钙离子浓度)田间持水量提高38.89%、水分累积蒸发量减少21.86%、蒸发速率降低5.51%、比表面积增大了7.95%、总孔体积增大了20.67%、平均孔径减少了19.41%、胶结物生成量提高了93.94%。因此,利用生物矿化作用改性煤矸石颗粒可以显著提升煤矸石的保水性能,碳酸盐矿化菌联合煤矸石在提高矿区沙化土壤保水性能方面有巨大潜力。Coal mining areas in Inner Mongolia Autonomous Region are mostly ecologically fragile areas with serious soil sanding in mining areas.Along with coal mining and development,coal gangue produces a large amount,which is difficult to be absorbed,encroaches on the land and has a serious impact on the environment.In order to reasonably use the coal gangue to improve the sandy soil in the mining area,uses a strain of carbonate mineralizing bacteria to mineralize and cement the gangue particles and improve the water retention performance of the gangue.Using indoor small-scale evaporation test,through the field water holding capacity,BET pore and specific surface area,scanning electron microscope joint energy spectrum surface scanning analysis method,to study the influence of different bacterial liquid amount,different calcium ion concentration on the effect of gangue biomineralization.The results showed that:(1)the use of carbonate mineralizing bacteria for biomineralization test can significantly improve the water retention capacity of coal gangue,the optimal amount of bacterial liquid added to the field water holding capacity of 40%,the optimal calcium ion concentration of the cement solution is 1.0 mol/L;(2)compared with the untreated gangue,M_(1)(40%bacterial liquid,1.0 mol/L calcium ion concentration)field water holding capacity increased by 38.89%,The cumulative evaporation of water decreased by 21.86%,the evaporation rate decreased by 5.51%,the specific surface area increased by 7.95%,the total pore volume increased by 20.67%,the average pore diameter decreased by 19.41%,and the collodion generation increased by 93.94%.Therefore,modification of gangue particles using biomineralization can significantly improve the water retention performance of gangue,and carbonate mineralizing bacteria combined with gangue has great potential in improving the water retention performance of sandy soil in mining areas.

关 键 词：煤矸石 碳酸盐矿化菌 生物矿化 保水性能 

分 类 号：TD989[矿业工程—选矿]