marras . 27, 2023 08:39 Takaisin listalle

Bentonite is a non-metallic mineral with montmorillonite as its main mineral component.

Bentonite (montmorillonite) because of its good physical and chemical properties, can be used as purification decolorizing agent, binder, thixotropic agent, suspension agent, stabilizer, filler, feed, catalyst, etc., widely used in agriculture, light industry and cosmetics, pharmaceuticals and other fields, so montmorillonite is a widely used natural mineral materials.

Bentonite can be used as a waterproof material, such as bentonite waterproof blanket, bentonite waterproof board and its supporting materials, laying by mechanical fixing method. Applied to the underground environment with a pH value of 4 to 10, the environment with a higher salt content should use modified bentonite, and should be used after testing qualified.

Adsorption is a natural phenomenon that occurs in all solid substances. The phenomenon that we gather certain molecules on the surface of bentonite is called adsorption of bentonite. This adsorption has been widely used in industry. For example, drilling mud often uses the adsorption characteristics of bentoniitti minerals to adjust the mud parameters for different purposes, such as adding filtration reduction agent, which is an indirect connection between bentonite particles and water molecules through the adsorption of one end of the polymer on the surface of the bentonite particles, and the other end soluble in water. A bridging effect is formed, which reduces the free water in the mud, changes the performance parameters of the mud, and achieves the purpose of reducing the filtration rate.

Bentonite expands when it meets water. The main reason for this natural phenomenon is that the crystal layer spacing of bentonite minerals increases, and water molecules enter the crystal layer of minerals. In addition, the cation exchange of bentonite minerals also causes the expansion of bentonite. The expansibility of sodium bentoniitti is obviously stronger than that of calcium bentonite. In addition, the expansibility of bentonite with higher purity and montmorillonite content is stronger. Therefore, in practical application, if we mainly want to use the expansibility of bentonite minerals, then we should first choose sodium bentoniitti ore when considering the type of bentonite minerals, and then consider sodium bentoniitti with high montmorillonite content. In the work of mechanical casting and iron ore pelletizing, the requirement of expansibility is high. A large amount of calcium bentonite can not meet the requirements of use, so it is necessary to modify the calcium bentonite before use.

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