What are the properties of bentonite? What are the absorbent resins? It's best to check their uses and prices
The method for the determination of CEC is divided into two categories: one is the Kjeldahl distillation method, the other is barium chloride - sulfate method.Absorbent bentonite can absorb 8~15 times the volume of water, the volume expansion after water absorption, volume expansion can increase several times to more than ten times. Water absorption of bentonite is expressed by water absorption ratio and water absorption ratio. The weight of the water absorbed by the unit weight of the bentonite is called water absorption, expressed as a percentage. In the initial stage, it increases with time, and finally reaches saturation. The percentage of water absorbed in the first ten minutes and the amount of water absorbed in two hours is called the water absorption ratio.
The swelling property of bentonite is expressed in terms of expansion capacity. The volume after expansion of bentonite in dilute hydrochloric acid solution is called expansion volume, expressed in ml / g sample. Sodium base bentonite, calcium base acid bentonite swelling capacity is high; the same type of bentonite, montmorillonite containing the higher swelling capacity. Swelling capacity is one of the technical indexes to determine the type of bentonite ores and evaluate the quality of bentonite.Adsorption of bentonite has certain adsorption capacity of various gases, liquids, organic substances, the maximum adsorption capacity of up to 5 times its weight, especially acidic bentonite and treated by acid activation of activated clay has good bleaching performance of various oils. In the past, the decolorization and decoloration capacity of bentonite were characterized by decolorization and specific surface area.
Determination of bentonite cation exchange capacity and exchangeable cation is the main basis for judging the quality of bentonite and classification of bentonite ore type. The cation exchange capacity refers to the total amount of cations such as K+, Na+, Ca2+ and Mg2+ absorbed under the pH value of 7, and the unit is mmol/100g soil. The English name for cation exchange capacity is Cation Exchange Capacity, referred to as CEC. The larger the CEC value of bentonite is, the greater the negative power is, the stronger its hydration, expansion and dispersion are, and the worse its hydration, expansion and dispersion.
Exchange cations in the montmorillonite layer can exchange properties in physical and chemical conditions, not only Ca2+, Mg2+, Na1+, K1+ and H+ can be exchanged, and polynuclear metal cations (such as hydroxyl aluminum thirteen dimer), organic cations (e.g. two methyl eighteen alkyl ammonium chloride) can also be cation exchange between the crystal layer. Cation exchange process is an important characteristic of bentonite, using the characteristic of modified bentonite, CA bentonite modified sodium bentonite; preparation of activated clay, lithium bentonite, organic bentonite, pillared montmorillonite and other products.
