锂膨润土粘土砂的实验研究
Experimental Research on Lithium Bentonite Clay Sand
潘嘉褀， 孙亚琴， 陈麒忠
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作者单位：（上海应用技术学院 材料科学与工程学院， 上海 200235）
中文关键字：粘土砂； 粘土； 锂化改性
英文关键字：clay sand; clay; lithium modification
中文摘要： 对钙-钠膨润土的锂化改性进行了研究，温度、碳酸锂加入量和溶液的pH值是锂化过程的三个重要参数，实验得出了这3个参数合适的取值范围。经XRD和红外光谱的微观分析，当锂离子置换钙离子后，膨润土的晶格间距减小，结构中的水分子减少。实验将两种膨润土作为粘结剂的型砂性能进行了测定，表明锂化改性的膨润土的各项技术指标优于钙-钠膨润土；相应粘土砂的综合性能，前者比后者有较大的提高。
英文摘要：The calcium sodium bentonite of lithium modification was studied, the temperature, dosage of lithium carbonate and lithium solution pH value are three important parameters, their appropriate value was obtained by experiment. Through microscopic analysis of XRD and infrared spectra, when calcium ion is replaced by lithium ion, the lattice spacing of bentonite and the water molecule number in the structure decrease. The performances of molding sands with two kinds of bentonites as sand binders are determined, the all technical indicators of lithium modified bentonite are superior to that of calcium-sodium bentonite; the overall performance of clay sands with the former has a greater improvement than that of with the latter.