基于红外光谱分析研究矿化剂对铝酸钙粉制备的影响  

Study on the Influence of Mineralizer on the Preparation of Calcium Aluminates Based on Infrared Spectroscopy

作　　者：范伟[1] 王亮[1] 郑怀礼[1,2] 陈伟[1] 唐晓旻[1] 尚娟芳[3] 钱力[4] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学低碳绿色建筑国际联合研究中心,重庆400045 [3]宜宾职业技术学院生物与化工工程系,四川宜宾644003 [4]重庆大学化学化工学院,重庆400044

出　　处：《光谱学与光谱分析》2015年第5期1214-1217,共4页Spectroscopy and Spectral Analysis

基　　金：国家科技支撑计划项目(2012BAJ25B09);国家自然科学基金项目(51078366)资助

摘　　要：研究了矿化剂对中低品位铝矾土对所制备铝酸钙粉的结构及其光谱性能的影响。以中低品位铝钒土和碳酸钙为主要原料,矿化剂CaF2为添加剂,三者经充分混合、高温煅烧和粉磨后,生产出的铝酸钙粉可直接用于制备聚合氯化铝、聚合硫酸铝、铝酸钠等水处理剂。通过调整原料中铝矾土和碳酸钙的质量比和矿化剂CaF2投加量的方法优化铝酸钙粉的制备工艺,采用红外光谱分析对铝酸钙粉和铝矾土进行表征,并对矿化剂的矿化机理进行研究。红外光谱分析结果表明:加入矿化剂CaF2,可促进铝矾土中硬水铝石、三水铝石和高岭石的分解转化,使碳酸钙的分解完全,使原料中的铝矾土与碳酸钙进行更加充分的反应,不仅有助于碳酸钙中的Ca与铝矾土中的Si结合,还有助于促进铝矾土中的Si—O,Si—O—Al及Al—Si键的断裂,使铝矾土中的Al充分溶出,从而提高Al2O3的溶出率;矿化剂CaF2的投加量(质量比)为3%时,可有效促进Al2O3的溶出;矿化剂CaF2的投加量为1.5%时,不足以起到充分的矿化作用;中低品位铝矾土较高品位铝矾土更易于烧结制备铝酸钙粉;在1 250℃下制备铝酸钙粉的最佳物料配比是:原料中铝矾土与碳酸钙的质量比为1∶0.6,矿化剂CaF2的投加量为3%。In this study,effect of mineralizer on the structure and spectraproperties of calcium aluminates formation was extensively studied.Medium or low-grade bauxite and calcium carbonate were used as raw material and mineralizer CaF2 as additive.Calcium aluminates can be obtained after mixing fully,calcination and grinding.The prepared calcium aluminates can be directly used for the production of polyaluminiumchloride（PAC）,polymeric aluminum sulfate,sodium aluminate and some other water treatment agents.The calcium aluminates preparation technology was optimized by investigating the mass ratio of raw materials（bauxiteand calcium carbonate）and mineralizer CaF2 dosage.The structure and spectra properties of bauxite and calcium aluminates were characterized by Fourier transform infrared（FTIR）spectroscopy analysis and the mineralization mechanism of the mineralizer was studied.FTIR spectra indicated that the addition of mineralizer promoted the decomposition and transformation of the diaspore,gibbsite and kaolinite,the decomposition of calcium carbonate,and more adequately reaction between bauxite and calcium carbonate.In addition,not only Ca in calcium carbonate and Si in bauxite were more readily reacted,but also Si—O,Si—O—Al and Al—Si bonds in the bauxite were more fractured which contributed to the release of Al in bauxite,and therefore,the dissolution rate of Al2O3 could be improved.The dissolution rate of Al2O3 can be promoted effectively when the mineralizer CaF2 was added in a mass ratio amount of 3%.And the mineralizer CaF2 cannot be fully functioned when its dosage was in a mass percent of 1.5%.Low-grade bauxite was easier to sinter for the preparation of calcium aluminates comparing with the highgrade one.The optimum material ratio for the preparation of calcium aluminates calcium at 1 250℃ was：the mass ratio between bauxite and calcium carbonate of 1∶0.6and mineralizer CaF2 mass ratio percent of 3%.

关 键 词：铝酸钙粉结构 矿化剂 铝矾土 光谱特性 矿化机理 水处理剂 

分 类 号：O657.3[理学—分析化学]