Preparation of high-purity magnesium hydroxide from magnesite: the latest process research and environmentally friendly production technology

The research on new processes for producing magnesium hydroxide from magnesite mainly focuses on the following aspects to improve production efficiency, reduce costs and improve product quality:

Direct production process: This method usually involves direct calcination of magnesite, which is then converted into magnesium hydroxide by hydration or other chemical means. For example, magnesite is calcined at a temperature range of 700 to 900°C to produce magnesium oxide, which is then hydrated to obtain magnesium hydroxide. The key to this process is to control the calcination temperature to ensure the formation of magnesium oxide and optimize the subsequent hydration step to obtain a product with high purity and good crystalline morphology.

Efficient Utilization of Low-Grade Magnesite: The research focuses on how to effectively utilize low-grade magnesite resources, remove impurities and improve magnesium extraction efficiency by optimizing pretreatment, selective leaching or chemical conversion technologies, thereby reducing production costs and protecting high-quality mineral resources.

Environmentally friendly processes: Develop green production processes, such as using more environmentally friendly solvents or catalysts to reduce energy consumption and waste emissions. At the same time, explore closed-loop circulation systems to achieve the recycling and reuse of wastewater and by-products in line with sustainable development requirements.

Crystal form control and surface modification: Study how to regulate the crystal form and crystal size of the product by accurately controlling reaction conditions (such as temperature, pressure, reaction time, pH value, etc.), such as producing products with specific morphologies (such as hexagonal flakes) of magnesium hydroxide, which plays an important role in improving the flame retardant performance and adsorption performance of the material. In addition, surface modification technology can improve the dispersion and compatibility of magnesium hydroxide with other materials.

Continuous and automated production: Promote the automation and continuous operation of production lines to improve production efficiency and product quality stability. This includes developing advanced reactor design, automatic control systems and online monitoring technologies to achieve more precise process control.

The research on new processes for producing magnesium hydroxide from magnesite is constantly advancing, aiming to achieve efficient use of resources, improve product quality, and optimize the environmental protection and economic efficiency of the production process. These studies are of great significance to promoting technological progress and industrial upgrading of the magnesite industry.