Controlling Its Shape In The Process Of Preparing Carbonate Manganese

Manganese carbonate has extensive application in many fields such as electronic engineering, ceramic, medicine, dope, cosmetic, et al. The technology of controlling manganese carbonate morphology has been increasingly lay store by researchers and has become a studying hot spot with the development of high technology in recent years in chemistry and materials field because manganese carbonate particals which have unique crystal morphology and even particle size distribution have excellent application potentials in fields such as biology, medicine, electronic, new material, et al.MnCO₃ particals which had regular appearance were prepared by taking MnSO₄ as the raw material and NH4HCO3 as the precipitating agent. Characterized by micrograph analyzer, scanning electron microscopy and X-ray powder diffraction, the key research was the craft parameters that affect manganese carbonate's crystal morphology during the crystallization process. Through analyzing rule of controlling crystal morphology, finally determined the best craft condition of preparation of MnCO₃ which has unique crystal morphology.It was found that: during the manganese carbonate low-temperature reaction crystallization, craft parameter such as pH, crystal additive, reaction temperature, NH4HCO3 concentration, agitation speed, reaction time, et al had varying degree influence on crystal morphology of manganese carbonate. It was the key factors that there were pH, ratio of crystal additive, reaction temperature. Manganese carbonate partials were more dispersed when reaction temperature was reduced and they tended to bccome uniformly spherical particles, but size of manganese carbonate mini-crystal became larger. PH value of the reaction solution was the key factor which influenced the morphology and particle size. The morphology of MnCO₃ crystalloid transformed from cubic one to spherical one when pH value decreased gradually between 8.0 and 7.0. But when pH was less than 7.0, sphericity of it would be more imperfect.Result showed that spherical manganese carbonate particals, cubic manganese carbonate particals and hollow spherical ones could be prepared by changing the physical quantity of various craft parameters. The result of this research could provide fundamental data to control the morphology of manganese carbonate.