低品位膨润土的提纯及其钠化工艺条件优化研究

以内蒙古某矿低品位钙基膨润土为试验研究对象,采用湿法提纯工艺,选用0.5%六偏磷酸钠为分散剂,矿浆浓度15%,将膨润土纯度从66.50%提高到95%;通过正交试验确定了影响钠化的主要因素和钠化的最佳工艺条件,制得的钠基膨润土其d001为1.2513nm,其阳离子交换容量和膨胀容分别为118.23 mmol/100g和30mL/g,为优质的钠基膨润土。

STUDY ON PURIFICATION OF A LOW GRADE Ca-BENTONITE AND OPTIMAL TECHNOLOGICAL CONDITIONS OF ITS Na-ACTIVATION

A low grade Ca-bentonite from Inner-Mongolia is taken as the object of the study.The wet processing technology of purification is carried out to enhance the grade from 66.5% up to reach 95% under the condition of using sodium polyacrylate 0.5% as dispersantant and a slurry density of 15%.The optimal technological conditions of Na-activation are found by orthogonal test.A high quality Na-bentonite is obtained with d001-value of 1.2513nm,CEC-value of 118.23mmol/100g and swelling capacity of 30mL/g.