Study On Preparation Of Different Morphology Of Barium Carbonate

As an important mineral products, barium carbonate is widely used in ceramics,glass, capacitors, building materials, chemical and other industries. Different areashave different requirements on morphologies of barium carbonate crystals, so thepreparation of barium carbonate crystals with different morphologies is an importantresearch of barium carbonate preparation. In this paper, selecting two main methodsof preparation of barium carbonate crystals present: co-precipitation andhomogeneous precipitation method, to analyze affects on the morphology of bariumcarbonate in two different reaction systems and reaction conditions by the SEM, IR,XRD and other means of specific research methods. At the same time, studies thefeasibility of prepared barium carbonate crystals by a new induction method usingmicrobial, establishes the preparation method system of barium carbonate crystalsbased on the new method. Experimental results show:In the direct precipitation method, morphology of barium carbonate crystalsprepared are different between Ba（NO3）2with （NH4）₂CO₃liquid phase reactionsystem and BaCl₂2H₂O with Na₂CO₃liquid phase reaction system in the sameexperimental conditions. The impact of crystal control agent on size and morphologyof barium carbonate crystal is also different.In the homogeneous precipitation method,（C₂H₅）₂CO₃with BaCl₂2H₂O liquidphase reaction system is more likely to occur than （NH2）2CO with Ba（OH）28H₂Oreaction liquid phase reaction system, and in any cases changing the reactionconditions, morphology of barium carbonate crystals prepared in the systemⅠareflower-like or dendritic, by contrast, in systemⅡmainly columnar or needle-like.In the induction method using microbial, the ideal reaction conditions: c（BaCl₂2H₂O）=0.1mol/L,n（BaCl₂2H₂O）:n（（NH₂）₂CO）=1:6, reaction time16h, temperature30℃, Bacillus pasteurii incubation temperature at30℃, shaking speed200rpm.