结合剂对莫来石-碳化硅耐火泥浆性能的影响  

Effects of binders on the properties of mullite-silicon carbide mortar

作　　者：冯子阔 王涵宇 孙伙长 赵燕 郑华 占华生 Feng Zikuo;Wang Hanyu;Sun Huochang;Zhao Yan;Zheng Hua;Zhan Huas heng(Beijing Jinyu Tongda Refractory Technology Co.,Ltd.,Beijing 100043,China)

机构地区：[1]北京金隅通达耐火技术有限公司,北京100043

出　　处：《耐火与石灰》2024年第3期25-29,共5页Refractories & Lime

摘　　要：针对干熄焦斜道区特殊的工况条件,按照<0.044 mm的矾土粉45%、<0.044 mm的碳化硅粉40%、α-Al_(2)O_(3)微粉10%、黏土粉5%,外加水玻璃、磷酸二氢铝、树脂作为莫来石-碳化硅耐火泥浆结合剂,进行对比各结合剂对耐火粉料的适配性及所制备泥浆的抗折粘接强度、耐磨强度。结果表明:1)浓度大的水玻璃与酸洗、碱洗和无处理碳化硅均剧烈反应,鼓胀发泡严重。其原因是结合剂会与粉料中Si发生化学反应产生气体,导致发泡鼓胀。随着水玻璃浓度降低,碱性变弱,与莫来石-碳化硅粉料的适配性提高。当促硬剂A的加入量为2%时,可以实现8 h内硬化需求。2)磷酸二氢铝溶液与莫来石-碳化硅粉料的反应产生鼓胀程度相对较小,粉料中的单质Fe与磷酸二氢铝反应产生气体并形成发泡鼓胀。采用酸洗碳化硅可有效降低胶泥鼓胀程度。当促硬剂B的加入量为3%时,可以起到很好的促硬作用。3)树脂与莫来石碳化硅粉料的适配性好,不产生发泡鼓胀现象,但其高温粘接强度远远低于水玻璃和磷酸二氢铝溶液粘接的强度,建议在牛腿区慎重使用。In view of the special working conditions of the inclined channel area of the dry quenching coke oven,45%of bauxite powder less than 0.044 mm,40%of silicon carbide powder less than 0.044 mm,10%ofα-Al_(2)O_(3)micropowder,5%of clay powder,water glass,aluminum dihydrogen phosphate and resin were used as mullite-silicon carbide refractory slurry binders to compare the adaptability of each binder to refractory powder and the flexural bonding strength and wear resistance of slurry.The results show that:1)the water glass with high concentration reacts violently with acid washing,alkali washing and untreated silicon carbide,and the bulging and foaming are serious;the reason is that the binder will react with Si in the powder to produce gas,resulting in foaming swelling.As the concentration of water glass decreases,the alkalinity becomes weaker,and the compatibility with mullite silicon carbide powder is improved.When the amount of hardening agent A is 2%,the hardening requirement can be achieved within 8 hours.2)The reaction between aluminum dihydrogen phosphate solution and mullite silicon carbide powder produces a relatively small degree of swelling.The elemental Fe in the powder reacts with aluminum dihydrogen phosphate to produce gas and form foaming swelling.Pickling silicon carbide can effectively reduce the swelling degree of cement.When the amount of hardening agent B is 3%,it can play a good hardening effect.3)The compatibility of the resin and mullite silicon carbide powder is good,and there is no foaming and bulging phenomenon,but its high temperature bonding strength is much lower than that of water glass and aluminum dihydrogen phosphate solution,and it is recommended to be used carefully in the corb el area.

关 键 词：耐火泥浆 结合剂 发泡 硬化 

分 类 号：TQ175.712.1[化学工程—硅酸盐工业]