碳酸钙纳米棒制备研究

摘要

Technology of preparation of calcium carbonate nano-rods using dolomite as raw material, through the processes of calcination, digestion, twice-carbonization, filtrating, washing, and drying was studied.SEM and XRD were employed to characterize the prepared samples.Effects of reaction temperature,mass concentration of calcium hydroxide,amount of crystal controlling agents,and type of added dispersant on product's particle size in twice-carbonization process were investigated. Experimental results showed that in twice-carbonization process, the calcium carbonate nano-rods whose average particle diameter of about 150 nm, average length of about 1 μm, and average aspect ratio of at 6～8 could be prepared under conditions of carbonization temperature of 20℃ (mass fraction) ,mass fraction of calcium hydroxide of 6% by adding 2% (mass fraction) crystal controlling agent and polyvinyl alcohol dispersant.%研究了以白云石为原料经过煅烧、消化、二次碳化、过滤、洗涤、干燥制备碳酸钙纳米棒的工艺.用扫描电镜(SEM)、X射线衍射(XRD)对合成的样品进行表征.重点考查了二次碳化工序反应温度、氢氧化钙质量浓度、晶型控制剂用量及添加的分散剂种类对产品粒径的影响.结果表明,在二次碳化工序中,在碳化温度为20℃、氢氧化钙质量分数为6％条件下,加入2％(质量分数)晶型控制剂和聚乙烯醇分散剂,可以制得平均直径约150 nm、平均长度约1μm、平均长径比为6～8的碳酸钙纳米棒.