Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5468641 | Applied Clay Science | 2017 | 6 Pages |
Abstract
This study reports a series of experiments conducted to evaluate the suitability of thiourea dioxide (TD) under mechanical activation, in bleaching iron-bearing impurities from raw kaolin. The optimum conditions for the maximum whiteness of 76.32% were determined as follows: rotation speed of ball mill, 400Â rpm; activation time, 1.5Â h; TD dosage, 0.8% of kaolin mass; solid-to-liquid ratio, 1:2; pH, 8.0; room temperature. The effect of grinding causes the partial surface amorphization of kaolin particles and a decrease in the dehydroxylation temperature. The assistance of grinding leads to a higher iron removal when compared with the conventional bleaching method using sodium hydrosulfite.
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Authors
Mang Lu, Guanghua Xia, Xiaolin Zhang,