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        How to identify bentonite

        Bentonite use montmorillonite as the main mineral composition of nonmetallic minerals refractory raw material.Bentonite use montmorillonite as the main mineral composition of nonmetallic minerals refractory raw material, it’s also called spot to take off the rock. It’s the main mineral composition of montmorillonite, which content in 85-90%, some properties of bentonite are also determined by the montmorillonite. It can display a variety of color, such as yellow, green, gray, white, and so on. It can be dense patches, also be used for the loose soil, you have slippery feeling by hand grinding, small block water volume swell after several times to 20-30 times, are suspended in the much water, paste in the little water. The properties of the montmorillonite based on its chemical composition and internal structure.

        To the naked eye, the identification of a high quality of bentonite is pure white, generally also have gray or pale yellow white, often because of the suction or contains impurities and was weak green, weak, rosy color, etc. Dried still is pure white, gray or pale yellow white. With the hand break after cross section is uneven, and frozen gel. Have oily luster, touching the slippery feeling. Can swell, good can become colloid. If after long-term dry moisture loss, it can become incompact again. Bentonite by a strong force of ion exchange, so it will adsorption or absorption of all sorts of color. It is mixed with oil, can make the oil glossy. Its fine powder and water suspension, dispersion (divergence) is very good, not easy to sink in. Natural bentonite type, mainly by the montmorillonite relative content is divided into the type of cation that calcium, sodium, hydrogen, lithium montmorillonite, etc., which is given priority to with calcium montmorillonite clay called calcium base bentonite.


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