Test of Chlorides Mixed with $\mathrm{CaO}$ , $\mathrm{MgO}$ , and Sodium Silicate for Dust Control and Soil Stabilization

It is well known that ${\mathrm{CaCl}}_2$ and ${\mathrm{MgCl}}_2$ can been used for dust control and soil stabilization in many fields. However, solutions of ${\mathrm{CaCl}}_2$ and ${\mathrm{MgCl}}_2$ are slightly acidic and their application is often forbidden in the area where acid is restricted. Furthermore, in wet seasons, ${\mathrm{CaCl}}_2$ and ${\mathrm{MgCl}}_2$ can be partly leached away by water and result in other pollution. In order to solve such problems, $\mathrm{CaO}$ , $\mathrm{MgO}$ and sodium silicate were individually mixed to the chlorides to reduce their acidity in the investigation. Based on a large number of experiments, the principal results are as follows: $\mathrm{CaO}$ , $\mathrm{MgO}$ , and sodium silicate cannot only reduce effectively the acidity of the solutions but also decrease greatly the water absorption capacity of the chlorides. The more $\mathrm{CaO}$ , $\mathrm{MgO}$ , and sodium silicate are added, the less its water absorption rate of the chlorides will be. At the same time, $\mathrm{CaO}$ , $\mathrm{MgO}$ , and sodium silicate can react with the chlorides, some ions on the surface of soil and dust particles, water and ${\mathrm{CO}}_2$ in atmosphere, and their formation products can also bind dust and soil effectively. The binding principles of dust and soil are also explained in detail in this paper.