摘要
本试验以钼尾矿为主要原料,添加膨润土、方解石等辅料制备陶粒,通过调节原料配比和烧结温度优化制备工艺确定性能最佳的钼尾矿基多孔陶粒。并通过静态吸附试验构建吸附动力学和等温吸附模型,研究了其对磷的吸附性能。综合评价当配方为60份钼尾矿、20份方解石、5份膨润土,烧成温度为1100℃,陶粒物理性能表现最好。陶粒对磷的吸附过程符合准二级动力学模型与Langmuir等温模型,其是以化学吸附为主导的单分子层吸附机制,平衡吸附量为0.982 mg/g。陶粒对磷的吸附贡献占比结果结合傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜-能谱(SEM-EDS)表征表明,离子交换与矿物沉淀是主要的化学吸附途径,含氧官能团的复合次之,物理吸附的贡献最小。
This study selected molybdenum tailings as the primary raw material,supplemented with bentonite,calcite,and other additives to prepare ceramsites.By adjusting the raw material ratios and sintering temperature to optimize the preparation process,the optimal performance of molybdenum tailings-based porous ceramsites was determined.Static adsorption experiments were conducted to establish adsorption kinetics and isothermal adsorption models,investigating their adsorption capacity for phosphorus.Comprehensive evaluation indicates that the optimal formulation ratio is 60 parts molybdenum tailings,20 parts calcite,and 5 parts bentonite,with a firing temperature of 1100℃,yielding the best physical properties for the ceramsites.The adsorption process of phosphorus onto the ceramsites conforms to the pseudo-second-order kinetic model and the Langmuir isotherm model,representing a chemisorption-dominated monolayer adsorption mechanism with an equilibrium adsorption capacity of 0.982 mg/g.The contribution ratio of ceramsites to phosphorus adsorption,combined with FT-IR,XRD,and SEM-EDS characterization,indicates that ion exchange and mineral precipitation are the primary chemical adsorption pathways.Oxygen-containing functional groups contribute secondarily,while physical adsorption has the smallest contribution.
作者
王云鹏
李计元
李亚静
鄂磊
Wang Yunpeng;Li Jiyuan;Li Yajing;E Lei(School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384;School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384)
出处
《非金属矿》
2025年第6期47-51,共5页
Non-Metallic Mines
关键词
钼尾矿
多孔陶粒
原料配比
烧成温度
磷吸附性能与机制
molybdenum tailings
porous ceramsite
raw material ratio
sintering temperature
phosphorus adsorption performance and mechanism
