Study on Sodium Modification of Inferior Ca-Based Bentonite by Suspension Method
Study on Sodium Modification of Inferior Ca-Based Bentonite by Suspension Method
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DOI：
10.5402/2011/953132
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
Yuanbo Zhang;T. Jiang;Liyong Chen;Guanghui Li
中科院分区：
文献类型：
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作者：
Yuanbo Zhang;T. Jiang;Liyong Chen;Guanghui Li
浑源钙基膨润土是中国大型膨润土矿床之一，储量在1.5亿吨以上。然而，它们在球团矿生产中并没有得到完全的利用。工艺矿物学研究表明，该膨润土是一种典型的钙基膨润土(CaBent)。本文采用悬浮法对样品进行了钠化改性研究。结果表明，在Na2CO3用量3.0%、矿浆浓度20%、钠温度55℃、钠时间0.5h的最佳条件下，改性钠基土的碱系数K由0.34提高到1.33，2HWA值、膨胀度和胶体指数分别提高到601%、32.4mL/g和87.6mL/(3g)，样品的d(001)由1.5539 nm降到1.2467 nm，2θ(001)由5.6875°增加到7.0907°。结果表明，样品中的钙基膨润土被有效地改性为钠基膨润土。
Hunyuan Ca-based bentonite is one of large-type bentonite deposits in China, the reserve of which is more than 0.15 billion tons. However, they are not completely utilized in the pellet production. Process mineralogy investigation shows that the bentonite is a kind of typical Ca-bentonite (Ca-Bent). The sodium modification of the sample is studied by suspension method in this study. Results present the alkali coefficient K of modified Na-bentonite that is increased from 0.34 to 1.33, and the 2HWA, dilation, and colloid index are, respectively, increased to 601%, 32.4 mL/g and 87.6 mL/(3 g) under optimal conditions of Na2CO3 dosage 3.0%, pulp density 20%, sodium temperature 55°C, and sodium time 0.5 h. The XRD patterns show that d(001) of the sample bentonite is reduced from 1.5539 nm down to 1.2467 nm, and 2θ(001) of the sample bentonite is increased from 5.6875° to 7.0907°, indicating that the sample Ca-Bent is effectively modified into Na-Bent.