The Study of Laterite Soil, Soda Feldspar and Kaolin for Ceramics Products Glazing

Abstract

The objectives of this research are to study the chemical composition of laterite soil from San Pa Pao Sub-district, Doisaket District, Chiang Mai Province and to study the mixture rate of laterite soil, soda feldspar and Lampang Kaolin from Northern Chemicals and Glassware Co., Ltd. All 3 kinds of raw materials are coarsely grinded with a jaw Crusher and then ground in a masher. The chemical compositions of laterite soil were analyzed. All 3 kinds of raw materials which have been ground and sifted through a 325 mesh sieve were weighed according to the mixture ratio. Each ingredient was stirred in a stirring tank and workpieces were glazed with 66 formulations. The glazed workpieces was fired in an oxidation atmosphere with an electric furnace in the ceramics laboratory of the Ceramics Technology Program, Faculty of Science and Technology, Chiang Mai Rajabhat University. The analysis of chemical compositions of laterite soil were found light element 57%, 25.62% of silicon, 4.06% of iron and 3.81% of potassium. Of all 66 ceramic glaze formulations, it was found that there are 7 best and suitable formulations for glaze ceramics applications, which have the appearance of smooth, glossy, beautiful color, including formulation 21 is brown, formulation 38 and 54 are light brown, formulation 46 and 56 are gray, formulation 57 is dull gray, and formulation 58 is light gray.