Abstract
Bleaching and calcining are the major whitening process in kaolin industry. However, the whitening mechanism has not been clarified yet. In this paper, the whitening mechanism of kaolin was investigated. Kaolin was bleached with hydrosulfite and calcined under different temperature separately, the whiteness and microstructure were detected throughly by X-ray diffraction and scanning electron microscope. The soluble and insoluble Fe content were determined by phenanthroline spectrophotometry. Effect of chemical bleaching, calcined temperature on mineral characteristics and whiteness was discussed. The mechanism of whitening was analyzed systematically.
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