How to increase the expansion times of calcium bentonite?
Bentonite has a strong moisture absorption, can be equivalent to its own volume of 8, 20 times the water and expanded to 30 times; in water medium can be dispersed as colloidal suspension
The activation of acid treated bentonite in aqueous solution, calcium and magnesium cations adsorbed on the surface by hydrogen ion substitution, volume significantly expanded, acidity is inadequate activation is not complete, the expansion degree is low, not inflated lower degree of adding acid, different solubility of bentonite in acid with acid, concentration and treatment when the temperature and time of change, the greater acidity oxidation three longer dissolved aluminum two more, with 1N sulfuric acid and hydrochloric acid as the contrast test of bentonite in sulfuric acid deposition speed, liquid is slightly turbid phenomenon, the expansion degree is high.
Has certain viscosity, thixotropy and lubricity, admixture and sand it has plasticity and adhesion, strong cation exchange capacity and adsorption capacity. The application of bentonite, bentonite with good physical and chemical properties, known as the "universal" clay said, as binder, suspension agent, thixotropic agent, stabilizer, purification and decoloring agent, filler, catalyst feed, etc., are widely used in metallurgy, petroleum, chemical, food, casting, environmental protection and other industrial sectors
