摘要
开发基于煤矿固体废物煤泥的光热材料处理高矿化度矿井水是同时实现矿区固废和矿井水资源化利用的重要手段.将煤泥煅烧和酸洗加工成具有良好光吸收和光热转换性能的煤基碳材料,在200~2500nm范围的光吸收率达95.0%,光照180s温度达55.1℃.通过在煤基碳材料中加入海藻酸钠,利用其与氯化钙交联反应,以碳酸氢钠作为造孔剂、聚乙烯醇作为稳泡剂,通过注滴法制备了一种耐高盐可自悬浮的球状蒸发器.测试不同前体物添加量下该蒸发器对高盐水的蒸发性能,结果表明:SA_(2/1)-MC_(2)具有较好的光热转换性能,在1kW/m^(2)光照下对20.0wt%NaCl溶液的蒸发速率达0.97kg/(m^(2)·h).将其用于高矿化度矿井水脱盐工艺中反渗透浓水的蒸发,蒸发速率达0.99kg/(m^(2)·h),在连续10h运行后仍保持稳定,是高矿化度矿井水除盐的理想材料.
The development of photothermal materials derived from coal slime,a solid waste from coal mining,offers a promising approach for the resource utilization of both coal waste and highly mineralized mine water.Coal slime was processed into coal-based carbon material(MC)through calcination and pickling processes.The MC exhibited excellent light absorption(~95.0%in the 200~2500nm)and photothermal performance,with the surface temperature reaching 55.1°C within 180s of illumination.A spherical evaporator with high-salinity resistance and self-suspension was prepared by incorporating sodium alginate into MC and crosslinking it with calcium chloride,using sodium bicarbonate as a pore-forming agent and polyvinyl alcohol as a foam stabilizer,via the dropwise method.The optimized composite(SA_(2/1)-MC_(2))showed strong photothermal performance,achieving evaporation rates of 0.97kg/(m^(2)·h)for 20.0wt%NaCl solution and 0.99kg/(m^(2)·h)for reverse osmosis concentrated mine water,with stable operation over 10h.These results demonstrate that SA2/1-MC2 is an effective material for treating highly mineralized mine water.
作者
李晓璐
吴尚迪
杨晨毅
陈欢
LI Xiao-lu;WU Shang-di;YANG Chen-yi;CHEN Huan(School of Geographic Sciences,Taiyuan Normal University,Jinzhong 030619,China;CCTEG Nanjing Design&Research Institute Co.,Ltd,Nanjing 210031,China;School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《中国环境科学》
北大核心
2025年第10期5489-5499,共11页
China Environmental Science
基金
低碳智能燃煤发电与超净排放全国重点实验室开放课题(2023FK098)。
关键词
高矿化度矿井水
光热蒸发技术
煤基碳材料
海藻酸钠
highly mineralized mine water
photothermal technology
carbon-based materials
sodium alginate
