摘要
煤气化细渣是煤炭气化过程中产生的固体废弃物之一,主要通过填埋或堆放进行处理,尚未实现规模化、工业化应用。针对气化细渣高灰、孔隙度高且具有较多连生组分的特性,以北方某地干粉煤气化细渣为研究对象,在查明物质组成、粒度组分布、表面形貌和内部结构的基础上,采用ALC-1.5型磨机进行预先磨矿,使残碳与玻璃体充分解离,再结合浮选的方式对气化细渣进行碳灰分离。试验结果表明,经过磨机精细磨矿后,气化细渣暴露其残碳表面,可浮性大幅提高;采用二次浮选工艺,当磨矿时间为3.5 min,粗选3#油用量为14 kg/t、甲基异丁基甲醇(MIBC)用量为3 kg/t,扫选3#油用量为14 kg/t、MIBC用量为1.5 kg/t,精矿产率为3.20%,精矿灰分为26.91%,尾矿产率为37.67%,尾矿灰分为91.77%,烧失量为8.23%,尾矿产品达到Ⅲ级粉煤灰要求。
Coal gasification fine slag is a solid waste generated during the coal gasification process.Typically,it is mainly disposed of through landfill or stacking and has not yet been widely utilized on a large-scale industrial level.This study focused on the dry coal gasification fine slag obtained from a specific location in the North of China,considering its characteristics such as high ash content,high porosity,and continuous components.In order to fully dissociate the residual carbon and vitreous body,the ALC-1.5 grinder was employed for pre-grinding after identifying the material composition,particle size composition,surface morphology,and internal structure of the slag.Subsequently,flotation was utilized to separate carbon and ash in the gasification fine slag.Experimental results revealed that fine grinding significantly increased the exposure of the slag′s residual carbon surface,greatly enhancing its floatability.Using the secondary flotation process with a grinding time of 3.5 min,the roughing flotation progress employed 14 kg/t of 3#oil and 3 kg/t of Methyl Isobutyl Methanol(MIBC),while the scavenging flotation progress used 14 kg/t of 3#oil and 1.5 kg/t of MIBC.The resulting concentrate exhibited a rate of 3.20%with an ash content of 26.91%.The tailings had a mineral content of 37.67%and an ash content of 91.77%.The loss on ignition(LOI)was measured at 8.23%.Overall,the tailings product met the requirements of Class III fly ash.
作者
解维伟
张子洞
李梓赫
付祥康
XIE Weiwei;ZHANG Zidong;LI Zihe;FU Xiangkang(School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《能源环境保护》
2023年第6期138-146,共9页
Energy Environmental Protection
基金
国家重点研发计划资助项目(2021YFC2902602)。
关键词
煤气化细渣
脱碳
磨矿
浮选
烧失量
Coal gasification fine slag
Decarbonization
Grinding
Flotation
Loss on ignition
