In addition, MgCl2 is a more soluble salt than KCl. This means that it can be used at higher concentrations, which also leads to more effective coagulation.
Finally, MgCl2 is less expensive than KCl. This makes it a more economical choice for use as a coagulant.
Here is a more detailed explanation of the coagulation process:
1. When MgCl2 is added to the AS2S3 sol, the Mg2+ ions are attracted to the negatively charged AS2S3 particles.
2. The Mg2+ ions form a layer of positive charge around the AS2S3 particles, which neutralizes the negative charge on the particles.
3. This causes the AS2S3 particles to come closer together and collide with each other.
4. The collisions cause the AS2S3 particles to stick together and form larger particles.
5. The larger particles settle out of the solution, which is known as coagulation.
The charge density of the coagulant ions is an important factor in determining the effectiveness of the coagulation process. The higher the charge density, the more strongly the ions are attracted to the oppositely charged particles, which leads to more effective coagulation.
The solubility of the coagulant salt is also an important factor. The more soluble the salt, the higher the concentration that can be used, which also leads to more effective coagulation.
The cost of the coagulant is also an important factor. MgCl2 is less expensive than KCl, which makes it a more economical choice for use as a coagulant.
In conclusion, MgCl2 is a better coagulant than KCl for AS2S3 sol because it has a higher charge density, is more soluble, and is less expensive.
