Abstract
A method of hydrothermal treatment has been tested to refine low-grade Amakusa pottery stones in both size ranges from 2.36 to 4.75 and from 4.75 to 9.5mm in order to upgrade for pottery use. Hydrochloric acid, 0.14mol/l, with addition of aluminum chloride is proved effective to alter albite into kaolin mineral under the hydrothermal condition at 200°C. This improves in the refractoriness of the treated samples as much as the same grade of the common high-grade Amakusa pottery stone. The treatment contributes to whiteness by decreasing Fe2O3 content of the products.
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