Macroscopic identification, high-quality bentonite was pure white, generally also gray or no yellow-white, often due to water or impurities and pale green, light green, rose red and other colors. After drying is still pure white, gray or light yellowish white. Hand breaking apart after the section is not flat, and was jelly-like. There is grease shiny, hand touch with a sense of sliding. Can be water swelling, good can become colloidal. If the long-term dry water after the loss, but also become loose. Bentonite has a strong ion exchange force, it can absorb or absorb a variety of colors. Mix it with grease to make grease more smooth. It's fine powder add water to the suspension, disperse (divergence) well and not easy to precipitate.
Natural bentonite type, mainly based on the type of cations of montmorillonite is divided into calcium, sodium, hydrogen, montmorillonite, etc., of which the main material of calcium montmorillonite is called calcium bentonite. Most of our bentonite ore to produce calcium-based bentonite-based, calcium-based bentonite cheaper than sodium bentonite, and easy to hand, so we in broiler and laying hens are used calcium base soil. Feed the chicken with bentonite, because the palatability is good, chicken love to eat.