建平膨润土的提纯工艺探索及其表征

An exploration of the purification of Jianping bentonite and its characterization

采用湿法工艺对辽宁低品位钙基膨润土进行提纯,研究了分散剂的类型以及用量、液固比、离心时间、离心速度以及膨润土温度对蒙脱石含量的影响,并通过X-射线衍射对原土及提纯土的结构进行了表征。结果表明,建平膨润土最佳提纯条件为:分散剂用量0·5%、最佳液固比12、离心时间9min、离心速度2500r/min、膨润土温度60℃。最佳条件下蒙脱石含量可以提高到92%以上。

In this paper, the low grade Ca-bentonite from Liaoning was taken as the object of the study and the wet processing technology of purification was employed. The influence of such factors as the tape and dosage of dispersants, the liquid-solid ratio, the speed of eentrifugation, the time of centrifugation and the temperature of bentonite on the content of bentonite was determined. The characterization of original soil and the purity of ben- tonite were tested by the X-ray diffraction photographs. The experiments show that the best conditions for pu~ rification are as follows： the concentration of dispersant is 0.5 %, the liquid-solid ratio is 12, the time of centrifugation is 9 min, the speed of centrifugation is 2 500 r/min, and the temperature of bentonite is 60℃ The purity of montmorillonite can be raised up to over 92 % after purification.