发泡注浆法合成莫来石轻质耐火材料

以工业废弃物粉煤灰和当地粘土为主要原料,十二烷基苯磺酸钠为发泡剂,采用发泡注浆法制备轻质莫来石耐火材料,研究了烧结温度对耐火材料晶相的影响以及发泡剂的种类、添加量和浆料固含量对轻质耐火材料常温物理性能的影响。结果表明,适当的烧结温度可改善耐火材料的晶相,同时对制品的孔隙率也有一定影响。选择适宜的发泡剂及添加量,在一定的浆料固含量范围内,可以制备容重小,孔隙率高,导热系数小,机械强度适中的轻质耐火材料。

Preparation of lightweight mullite refractories by foaming method

Lightweight mullite refractories were prepared by the foaming method using industrial waste flyash and clay as raw materials, with sodium dodecyl benzene sulfonate as foaming agent. The influences of synthesis temperature on crystalline phase of refractories were investigated. The influences of different types of foaming agent, the concentration of foaming agent and slurry solid content on the physical properties at room temperature of the lightweight mullite material were also investigated. The results show that appropriate sintering temperature can improve crystalline phase of refractories, and also impact the porosity of the refractories. The sintered samples have lower bulk density, high porosity, low thermal conductivity and moderate mechanical strength by choosing the most suitable foaming agent, changing their dosage and solid content of slurry.