Application Of Pneumatic Lifting Homogenizer In Preparation Of Nanometer Magnesium Hydroxide

Application of Pneumatic Lifting Homogenizer in Preparation of Nanometer Magnesium Hydroxide
 China is a large resource of magnesium resources, the western salt lake is particularly rich in magnesium resources, mainly in the form of water brucite, the cost is very low. China's use of magnesium resources at a low level, mainly in the form of direct export MgCl2 # 6H2O, resulting in waste of resources. Therefore, the use of Pneumatic Lifting Homogenizer to improve its quality, to optimize the use of resources, is very necessary.
Magnesium hydroxide has the characteristics of high decomposition temperature, good thermal stability, non-toxic, smoke-free and smoke suppression, and can be used as high-performance inorganic flame retardant in polymer materials. Environmentally friendly flame retardant magnesium hydroxide has been the attention of all countries, the research and production activities are very active, especially high purity, ultra-fine magnesium hydroxide flame retardant has become a hot research and development at home and abroad. The preparation method of superfine Mg (OH) 2 powder at home and abroad is mainly composed of precipitation synthesis method, hydrothermal method, reverse precipitation method and precipitation-azeotropic distillation method. However, there are still many problems such as large particle size , The purity is not high, product agglomeration serious, uneven particle size distribution and equipment requirements, complex operation and other shortcomings.
In this paper, self-made hexamethionium chloride as raw material, the use of direct alkali solution, the surface treatment, filtration washing, drying process to prepare high-purity nano-hydroxide Magnesium is a new process for the preparation of high purity nano magnesium hydroxide. To prepare pure sodium hydroxide, potassium hydroxide as raw material, the preparation of different concentrations of dilute alkali solution; weighed a certain amount of self-made six ammonium magnesium chloride, alcohol solution is prepared with the reaction of brucite, its purity up to More than 99.18%. In the Pneumatic Lifting Homogenizer under the conditions of stirring into a certain volume of dilute alkali solution hydrolysis 2 ~ 5h; aging 24 hours later, using water or methanol, ethanol, the suspension will be filtered to chloride ions can not be detected. The washed cake was dried at 120e for 2 ~ 3h, and the obtained magnesium hydroxide was analyzed by chemical composition and the particle size and morphology were observed by transmission electron microscopy.
The other reagents or starting materials used in the experiment were of analytical grade. Pneumatic Lifting Homogenizer production, model BME100LX. 100 g of magnesium chloride in hexahydrate was added to 2 L 10% NaOH aqueous solution at 30 and 50e, and reacted for 5 hours under the agitation of the Pneumatic Lifting Homogenizer for 24 h, washed with water and ethanol, filtered to chloride ion ( With 011mol # L-1AgNO3) aqueous solution can not be detected. The resulting cake was dried at 120e for 2 to 3 hours and sampled. The results of transmission electron microscopy showed that the difference of particle size of nanometer magnesium hydroxide was less than 100nm, but the results were slightly better. Therefore, the temperature conditions under the conditions of the process is not significant. The preparation conditions of high purity nano-magnesium hydroxide were as follows: 10% NaOH was reacted with homemade hexamethoxysilane under aerobic homogenizer for 5 hours, aged 24 hours, washed with water and ethanol, To chloride ions (011mol # L-1AgNO) water can not be detected, washed the cake at 120e dry 2 ~ 3h.