The ultrafine refinement of magnesium hydroxide powder has become a hot topic. The smaller the particle size of magnesium hydroxide flame retardant, the better its flame-retardant effect. As the particle size of magnesium hydroxide powder decreases, its specific surface area increases, and its surface properties also change, which helps improve the mechanical properties of the product. Therefore, compared with other approaches, particle size ultrafine refinement is more conducive to enhancing a company's market competitiveness. Particle size refinement is simpler than other processing methods, enabling the production of high-grade powder at low cost, and the resulting product is more versatile.

Ultrafine grinding of high-purity magnesium hydroxide is generally carried out usingJet mill, ultra-fine powders in the range of 1-74 microns can be easily obtained.

A jet mill for producing high-purity magnesium hydroxide, comprising a material bin, a jet milling device, a jet classification device, a cyclone collection device, a dust removal device, and an induced draft fan connected in sequence. The crushing chamber of the jet milling device is fixed on a support frame, and a gas distribution plate is provided on the outer side of the crushing chamber. The gas distribution plate is connected to the compressed air outlet of an air compressor via a gas transmission pipe. The compressed air is distributed by the gas distribution plate and then supplied to nozzles whose spray holes communicate with the inner cavity of the crushing chamber. The device is characterized in that an air filtration device is provided at the air inlet of the air compressor. The air filtration device comprises a housing and a filter element, both of which are hollow structures. The upper end of the housing is provided with an end cover, and the lower end is provided with an air outlet. An air inlet is provided at the center of the end cover. The filter element is arranged inside the housing, with its lower end fixed on the bottom surface of the housing and coaxially arranged with the air outlet. The filter element is made of a breathable material. The outer wall of the filter element is sequentially wrapped with a filter screen, a filter layer, and a filter cloth from the inside out. The filter layer consists of at least one layer of filter paper folded along the circumferential direction of the outer wall of the filter element to form an annular pleat connected end to end, and activated carbon particles are attached to the filter paper.
Using an airflow mill to process magnesium hydroxide not only achieves high crushing precision and efficiency but is also safe and environmentally friendly. It operates in a fully enclosed negative pressure system, ensuring no dust in the workspace, making it highly suitable for large-scale processing and continuous production. It has now been widely adopted.