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Orthogonal Experiments for Kaolin Bleaching by Using Sodium Dithionite and Sulfuric Acid

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Abstract:

The quality of the kaolin is always measured by iron contents since this element gives undesirable reddish color which limits the usage of this type of minerals. Reducing the iron contents to increase the value of kaolin by bleaching process is investigated. The effects of factors which can improve the whiteness of kaolin have been studied. The dosage of sodium dithionite, pH value, solid-to-liquid ratio and reaction time were chose as factors based on mono-factor experimental results. Orthogonal experiments were carried out and the optimum processing conditions of the reductive bleaching were obtained as the dosage of sodium dithionite 3%, pH 2, solid-to-liquid ratio 1:3 and reaction time 45min. After bleaching process described above, we obtained a great improvement in the whiteness from 69.93% to 81.31% and a decrease of Fe2O3 content from 0.52% to 0.40% of the kaolin.

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Periodical:

Advanced Materials Research (Volume 968)

Pages:

116-121

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.968.116

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Online since:

June 2014

Authors:

Jin Tang Li*, Xue Zeng, Chuan Hai Gan, Shi Qiu, Rong Yi Chen, Xue Tao Luo

Keywords:

Bleaching, Kaolin, Sodium Dithionite, Whiteness

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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