泡沫胶凝法制备轻质钙长石耐火材料的工艺研究  

Preparation of lightweight anorthitic refractories by foaming-gel method

作　　者：夏光华[1,2] 谢穗[1,2] 何婵[1,2] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院,江西景德镇333403 [2]先进陶瓷材料江西省重点实验室,江西景德镇333001

出　　处：《耐火材料》2011年第3期187-190,共4页Refractories

基　　金：科技部中小企业科技创新基金项目(06C26213601348)

摘　　要：以煅烧矾土、煅烧高岭土、硅灰石、蛋白质发泡剂、明胶、聚乙烯醇、硅溶胶和聚合硫酸铝为原料,采用泡沫胶凝法制备了轻质钙长石材料,主要研究了蛋白质发泡剂加入量、明胶加入量、硅溶胶和聚合硫酸铝的加入时机以及硅溶胶加入量等对泡沫胶凝成型工艺的影响,并分析了烧成后轻质钙长石材料的物相组成、显微结构和性能。结果表明:1)蛋白质发泡剂-水泡沫体系中蛋白质发泡剂的体积分数为15%时,体系的发泡倍数达到最大;每100 mL蛋白质发泡剂-水泡沫体系中加入1.2 g明胶时,泡沫的沉陷率最小,稳定性最好;将聚合硫酸铝促凝剂分散到黏稠泥浆中,制成泡沫泥浆后,在高速搅拌下按1 L泡沫泥浆加入137 mL硅溶胶的比例缓缓加入硅溶胶,搅拌结束15 m in后体系发生胶凝。2)按试验确定的最佳工艺成型并于1 280℃保温0.5 h烧成后的轻质钙长石材料,以钙长石为主晶相,并有少量刚玉相;烧成后的轻质钙长石材料为多孔结构,其气孔多为封闭气孔,且分布较均匀,平均孔径约200μm;烧成后的轻质钙长石材料的性能参数已达到,有的甚至已超过德国的Jm23砖。Lightweight anorthitic was prepared by foaming-gel method using calcined bauxite,calcined kaolin,wollastonite,protein foaming agent, gelatin, polyvinyl alcohol, silica sol, and polymeric aluminum sulfate as starting materials. The influences of protein foaming agent addition, gelatin addition, adding occasions of silica sol and polymeric aluminum sulfate as well as the silica sol addition on the foam-gel shaping were discussed,and the chemical composition, microstructure, and properties of the fired lightweight anorthitic were analyzed. The results show that： （ 1 ） when volume content of protein foaming agent in protein foaming agent-water system is 15% ,the foaming multiple of the system is the biggest;when adding 1.2 g gelatin in 100 mL protein foaming agent-water system,the subsidence rate of bubble is the lowest and its stability is the best;when spreading polymeric aluminum sulfate coagulant to sticky mud to prepare foemed mud,stir- ring at high speed,slowly adding silica sol in proportion of 137 mL silica sol in ：1 L slurry bubble,：15 min after stirring,the system begins to have the gelation ;2）the lightweight anorthite material shaping by the optimum technology and firing at ：1 280 ~C for 0.5 h,consists of anorthitic as principal crystalline phase and a small amount of corundum phase ;the fired anorthite lightweight material has porous structure,and its Pores are mostly closed with average size of about 200 μm and distribute uniformly; performance parameters of fired anorthite lightweight materials have achieved or even surpassed those of Germany＇s Jm23 brick.

关 键 词：蛋白质发泡剂 胶凝成型 钙长石 轻质耐火材料 

分 类 号：TQ175.713[化学工程—硅酸盐工业]