Magnesium hydroxide is an important chemical product and intermediate, which can be used as flame retardant of rubber, plastic, fiber, resin and other polymer materials, wastewater neutralizer, flue gas desulfurization agent or coal solid sulfur agent, also can be used as electronic materials or pharmaceutical preparations. In the above applications, except for wastewater neutralization agent and flue gas desulfurization, coal-fired sulfur fixing agent, all have special requirements for its microscopic form.
For example, rubber, plastic flame retardant with magnesium hydroxide, it is required to have a good flake, fibrous shape, because such a shape can be better matched with the raw material, without affecting the physical properties of the raw material such as strength. When used as flame retardant, the amount of magnesium hydroxide added is about 40%, if the matching is not good, the strength of rubber or plastic will be greatly reduced, affecting its performance.
Electronic materials with magnesium hydroxide not only requires a small enough particle size, and preferably with a flake shape. Because the process of electronic materials is a solid-phase reaction, after sufficient grinding to calcine or sintering, flake shape can be better and other materials mixed uniformly, combined with tight. This kind of powder material is good for the diffusion of ions and solid phase reaction when calcined, which can not only shorten the calcination time, but also can get the electronic ceramics with excellent performance.
Therefore, it is very important to study the microscopic morphology of magnesium hydroxide to improve the quality of electronic materials. It has been shown that the microscopic morphology of magnesium hydroxide is directly related to its particle size, i.e., the particle size of magnesium hydroxide often determines its microscopic morphology. We used the brine-ammonia-precipitation process to study the relationship between the particle size and the microscopic morphology of magnesium hydroxide initially, and obtained a more definite conclusion.