The purpose of the study was to evaluate the physical and chemical properties of bentonite from Thailand in the province. Sara Buri and Kanchanaburi Test chemical properties such as pH - pH measured by using pH - alkaline (pH meter) of type of ore. By using X-ray Nintendo length (X-ray Diffraction, XRD) test for physical properties of bentonite. The percentage of humidity (moisture) color (Color) method to test the physical properties of water, mud and specific gravity (Specific density) Density (Density), viscosity (Viscosity) Resistance (Resistivity) of sand (Sand Content) volume. solid (Solid content), and the diffusion of shale (Filtration) standards of API RP 13B, 1976 by testing samples of mud mixed with bentonite from Thailand (Lopburi. Sara Buri and Kanchanaburi) and the US By testing samples of muddy water. In the temperature range 25, 50, 75, 100 ° C, and then testing to improve the efficiency of muddy water. Bentonite mixture of Lopburi. Sara Buri and Kanchanaburi The addition of various additives
such as: CMC soda ash polymer using a ratio of 1 cent, 5 and 10, respectively, by comparison of the temperatures 25, 50, 75, 100 degrees Celsius to optimize it accordingly. The following standard API
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