The pulping rate is the dispersion of bentonite particles in water to form a suspension, and when the apparent viscosity of this suspension is 15*10-3Ps·s, the number of cubic meters of pulp per ton of bentonite is an important indicator to measure the quality of bentonite. The pulping performance of sodium bentonite is better than that of calcium bentonite.
The cations can bind the bentonite particles together and restrict the dispersion of the bentonite particles. The charge density of multivalent ions is larger than that of monovalent ions, and a strong electrostatic attraction is generated between particles, which makes the binding ability of bentonite particles strong. Therefore, the dispersing ability of calcium bentonite is weaker than that of sodium bentonite.
The type of interlayer cation of bentonite determines the type of bentonite. When the interlayer cation is Na+, it is called sodium bentonite; when the interlayer cation is Ca+, it is called calcium bentonite. The properties of sodium montmorillonite (or sodium bentonite) are better than those of calcium. . However, the distribution of calcareous soil is far wider than that of sodium soil in the world, so in addition to strengthening the search for sodium soil, it is necessary to modify the calcareous soil to make it a sodium soil.