摘要
采用EDTA络合-球磨法在室温下制备超细沉淀BaSO_4,研究了工艺参数对BaSO_4粒度分布和形貌的影响。通过XRD、SEM、激光粒度分布仪和FTIR等分析手段对产物的晶相、形貌和粒度进行表征,并探讨了反应机理。结果表明:BaCO_3浓度、EDTA的添加量和反应时间对BaSO_4的粒径影响较大,Na_2SO_4的添加速度对粒度影响相对较小。随着反应体系pH增大,BaSO_4颗粒形貌由不规整的针状逐渐转变为竖直排列的棒状团簇体,并且颗粒边缘趋于光滑。在BaCO_3浓度为0.2 mol·L~(-1),BaCO_3、EDTA、Na_2SO_4摩尔质量比为1:0.5:1.2,反应体系pH=8时可以得到平均粒径为130 nm均匀分散的棒状团簇体沉淀BaSO_4微粒。
Ultrafine precipitated barium sulfate was synthesized by wet ball milling in the presence of EDTA at room temperature. Effects of preparation parameters on BaSO_4 size distribution and morphology were investigated. XRD, SEM, FTIR and laser particle size analyzer were used to characterize crystalline,morphology and particle size of BaSO_4 particles. Furthermore, the reaction mechanism was discussed. The results show that BaCO_3 concentration, EDTA amount and reaction time have obvious effects on BaSO_4 particle size. However, feeding rate of Na_2SO_4 has few effects on BaSO_4 size distribution. The morphology of BaSO_4 particles changes from needle-like to vertical arrangement of rod-like clusters with pH increase, and particle edge becomes smooth. The well-dispersed rod clusters with average size of 130 nm are synthesized at c(BaCO_3)= 0.2 mol·L~(-1), x(BaCO_3):x(EDTA):x(Na_2SO_4) = 1:0.5:1.2 and pH = 8.
引文
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