黏土矿物复合材料固化电解锰渣中Mn的研究

Study on Solidification Efficiency of Mn in Electrolytic Manganese Residue by Clay Mineral Composites

该文对黏土矿物基础材料进行改性,并优选黏土矿物改性材料与腐殖酸钠、酚醛树脂进行复合,制备出黏土矿物复合材料,探究不同黏土矿物材料对电解锰渣中Mn的固化效果以及它们在水相中的Mn^(2+)吸附特性。在黏土矿物材料添加量为10%时,高岭土、蒙脱石和伊利石对锰渣中Mn的固化效率最高仅为24.5%;对黏土矿物基础材料进行亚硫酸钠或硝酸改性后,固化效率可提高到38.1%;将黏土矿物改性材料与腐殖酸钠、酚醛树脂复合制备的材料施加到电解锰渣后,Mn固化效率最高可达67.1%,相比黏土矿物改性材料的固化效率有明显的提升。吸附实验表明,相比Freundlich吸附模型,黏土矿物复合材料对Mn^(2+)的吸附特征与Langmuir吸附模型的特征更加匹配,且Mn^(2+)饱和吸附量达到14.458 mg/g,明显优于腐殖酸类材料。

In the present experiment,natural clay minerals are modified,which were optimized to compound with sodium humate and phenolic resin.Thereby,clay mineral composite materials are prepared,based on which,investigation of the solidification effects of different clay minerals on Mn in electrolytic manganese residue and their adsorption characteristics of Mn^(2+)in water phase were carried out.As a result,with the added amount of clay mineral composite materials equals 10%,the curing efficiency of kaolin,montmorillonite and illite is merely 24.5%,but after the modification process with sodium sulfite or nitric acid,the curing efficiency is raised to 38.1%;furthermore,by compounding with sodium humate and phenolic resin,the Mn curing efficiency of clay mineral composites in electrolytic manganese residue can significantly improve,being up to67.1%.According to the adsorption experiment,the adsorption characteristics of Mn^(2+)on clay mineral composites better conform to Langmuir adsorption model than to Freundlich adsorption model;and the saturated adsorption capacity is as high as 14.458 mg/g,which is obviously better than that of humic acid materials.