Difference between calcium base and sodium base
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.