METHOD FOR IMPROVING FILTRATION EFFICIENCY IN NEUTRALIZATION-SYNTHESIZING PROCESS BY WET METHOD

摘要

PURPOSE: A method for improving filtration efficiency in a neutralization-synthesizing process by a wet method is provided which controls the increase of the specific surface area of particles by adjusting the pH value so that the filtration efficiency in a filtering process is improved. CONSTITUTION: A synthesizing method of an oxide or a hydroxide comprises steps of: (i) after mixing starting raw materials in an adequate ratio, neutralization-synthesizing the mixed materials by a wet method; (ii) separating an oxide or a hydroxide sludge from the product of the step (i); and (iii) removing impurities from the oxide or hydroxide sludge by repeatedly washing and filtering the separated oxide or hydroxide sludge to obtain the oxide or hydroxide. Wherein, the pH value of the oxide or hydroxide sludge maintains to 10-11 in the step (iii) to improve the filtration efficiency.