Experiments show that when the pH value of ammonia water is low, the supersaturation of the reaction is low, so the magnesium hydroxide particle size is large and the sedimentation time is short; when the pH value of ammonia water is high, the supersaturation of the reaction is high and the sedimentation time of magnesium hydroxide is long. At a certain temperature, the supersaturation ratio has the greatest influence on the nucleation rate. Therefore, it is also necessary to maintain a large solution pH value (pH=1315) during the experiment, that is, a large OH- ion concentration. Effect of reaction temperature on the sedimentation performance of magnesium hydroxide When the reaction temperature is too low, the magnesium hydroxide generated by the reaction is in a colloidal state and has poor filtration performance. With the increase of reaction temperature, the reaction is more than 10%. If it is cooled to room temperature in a closed environment, its hydration rate can be less than 3%, which can meet the requirements of the hydration rate of silicon steel grade magnesium oxide.
Key technology research and development project for the preparation of ultrafine and special morphology oil-soluble magnesium hydroxide by covalent cross-linked magnetic core-shell technology. This project studies the preparation of magnetic composite materials and their application in copper-containing wastewater. The project has achieved a breakthrough in the key process of continuous production of high-end magnetic magnesium hydroxide flame retardants, and established a test device with an annual output of 1,000kg of high-purity, ultrafine and special morphology highly dispersed magnetic magnesium hydroxide composite materials. It has explored the influencing factors of performance parameters such as the structure, pyrolysis and surface chemical characteristics of magnesium hydroxide on the performance of flame-retardant polymer materials, provided new ideas for surface modification of different flame-retardant polymer materials, expanded the application field of high value-added magnesium hydroxide, and promoted the development of environmentally friendly flame-retardant polymer composite materials.
