Research progress on preparation and mechanism of brucite powder

Brucite powder, also known as magnesium hydroxide, is widely used in many fields due to its high magnesium content and environmentally friendly properties. This article reviews the latest preparation methods and mechanism research progress of brucite powder, including mechanical activation, hydrostatic pressure influence, surface modification, and hydrothermal synthesis, etc., aiming to provide scientific basis for the industrial production and application of brucite powder.

1. Preparation method of brucite powder

There are various preparation methods for brucite powder, including mechanical activation, hydrothermal synthesis and highly dispersed and highly fine flame-retardant magnesium hydroxide synthesis process. Mechanical activation is used to prepare ultrafine brucite powder by high-energy ball milling. The study found that mechanical force has a significant impact on the crystal structure of brucite powder under different ball milling times. The hydrothermal synthesis method prepares ultra-fine, high-purity, uniform and evenly dispersed magnesium hydroxide particles through hydrothermal treatment. The crystal phase, morphology and particle size of the obtained magnesium hydroxide particles are characterized by XRD and SEM.

2. Effect of hydrostatic pressure on brucite crystal structure

The study also found that hydrostatic pressure plays an important role in the crystal structure of brucite. As the hydrostatic pressure increases, the band gap of brucite increases, mainly due to the movement of the Mg 2p conduction band to the high-energy direction. The electron density difference results show that H bonds rearrange as the hydrostatic pressure increases, and the H bond angles calculated theoretically are very close to the experimental values.

3. Surface modification of brucite powder

Surface modification is an important means to improve the application performance of brucite powder. Surface modification of brucite powder by silane coupling agent can effectively reduce its surface energy and improve the dispersion of the powder, thereby reducing agglomeration in the dry state. FTIR analysis shows that silane coupling agent molecules are adsorbed on the surface of the modified brucite powder, changing its surface properties.

4. Adsorption mechanism of brucite powder

Research on the adsorption mechanism of brucite powder mainly focuses on its adsorption performance for heavy metal ions. Research shows that the adsorption process of Pb2+ by brucite powder conforms to the pseudo-second-order kinetic model and Langmuir isotherm model, indicating that the adsorption of Pb2+ by loaded brucite and loaded hydrotalcite is a surface chemical adsorption process. The saturation adsorption capacities calculated by the Langmuir isotherm model are 442.5 mg/g and 246 mg/g, which are consistent with the experimentally measured values and higher than those reported in the literature. Hydrotalcite can be effectively produced through different preparation methods and surface modification technologies. Improve the performance of brucite powder and enhance its application potential in environmental protection, flame retardant and other fields. Future research will further explore the optimization of the preparation process and application mechanism of brucite powder to achieve efficient utilization in industrial production.