Welcome to the official website of Ningcheng Qiyun Bentonite Co., Ltd!
Adsorption of Bentonite
Published:
2022-10-25
Adsorption is a natural phenomenon in the presence of all solid substances. The phenomenon that certain molecules gather 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 bentonite minerals to adjust mud parameters for different purposes of use. For example, adding a fluid loss additive means that one end of the polymer is adsorbed on the surface of the bentonite particles, and the other end is dissolved in water, creating an indirect connection between the bentonite particles and water molecules. A bridging effect is formed, which reduces the free water in the mud, changes the performance parameters of the mud, and achieves the goal of reducing the filtration rate.
Bentonite adsorption can be divided into three types: physical adsorption, chemical adsorption, and ion exchange adsorption.
l) Physical adsorption. Physical adsorption is generated by the intermolecular attraction between the adsorbent and the adsorbate, which is often referred to as the van der Waals force. Physical adsorption is a reversible adsorption process in which the adsorption rate and desorption rate are in dynamic equilibrium under certain conditions. The main reason for physical adsorption is that the molecules on the surface of bentonite have surface energy. Due to the high dispersion of bentonite in water, the physical adsorption phenomenon is very obvious.
2) Chemical adsorption. Chemical adsorption is generated by the chemical bond force between the adsorbent and the adsorbate, and chemical adsorption is generally irreversible. The application of chemical treatment agents in drilling mud is a typical example of chemical adsorption, such as the addition of iron chromium lignosulfonate to bentonite mud, which utilizes chromium ions to undergo integrated adsorption on the edges of bentonite crystals. This chemical adsorption is significantly more stable than physical adsorption. Therefore, bentonite mud treated with iron chromium lignosulfonate has high temperature resistance, and can be used as a high-temperature resistant mud system for geothermal and ultra-deep wells.
3) Ion exchange adsorption. Bentonite mineral crystals generally have a negative charge, so it is necessary to adsorb equivalent amounts of oppositely charged cations on the surface of the bentonite particles. The adsorbed cation can exchange with the cation in the solution, which is called ion exchange adsorption. The characteristics of ion exchange adsorption are: the same number of ions are exchanged with each other, and the isoelectric quantity is exchanged with each other. The reaction of ion exchange adsorption is reversible, and the speed of adsorption and desorption is affected by the ion concentration, which conforms to the law of mass action.
Related information
Contact
Customer Service Center
Person in charge of casting soil Mr. Zhang：+86-13948669997
Person in charge of cat litter Mr. Wen：+86-15947134515
Person in charge of casting soil Mr. Zhang：+86-13948669997
Person in charge of cat litter Mr. Wen：+86-15947134515
Project Cooperation
Tel：+86-476-4233065
E-mail：ncqiyun@163.com(Ningcheng Qiyun Bentonite Co., Ltd. )
E-mail：ncxingmei@163.com(Ningcheng Xingmei Technology Co., LTD.)
Transportation Guide
Address: Zhongjing Industrial Park, Ningcheng County, Chifeng City, Inner Mongolia
Keywords: foundry bentonite, montmorillonite, cat's litter, bentonite raw ore, papermaking soil, impervious particles, metallurgical pellets