Precursor particle size control and active magnesia powder preparation

With brine and lime as raw materials,adopting seed crystal circulation growth for the control of different particle size of magnesium hydroxide precipitate,respectively in different thermal system decomposition and preparation of magnesia powder,study on precursor particle size and magnesium oxide activity relationship.The results show that,a small particle size of magnesium hydroxide(only one quick reaction to obtain) in lower decomposition temperature(such as 500-600℃) and appropriate decomposition of the time(4h) conditions,the prepared magnesium oxide with high sintering activity,thereby obtaining high temperature sinter-magnesia with high compactness(volume density of 3.47g/cm3).