Influence of Setting Accelerating Agents on Properties of Colloidal Alumina Bonded Corundum Castables

作者：ZHANG Xiaohui,YU Xingguo,WANG Baoyu,ZHU Boquan

摘要：In order to improve the flow ability and early-stage strength of colloidal alumina bonded corundum castables,the colloidal alumina with 20%of solid content was used as the binder,and tabular corundum aggregates and fines,and active alumina micropowder CL370 as the main starting materials.Influences of setting accelerating agents(magnesia fines and sodium meta-aluminate)on the linear change rate,the modulus of rupture and the microstructure of corundum castables after different heat-treatments were researched.The results show(1)cement bonded corundum castables have the highest modulus of rupture after 24 h of demolding,and colloidal alumina bonded corundum castables have the lowest one;both magnesia fines and sodium meta-aluminate can improve the strength after 24 h of demolding;(2)after firing at 1000℃for 3 h,the modulus of rupture of all specimens decreases,even lower than that after 24 h of demolding;(3)after firing at 1600℃for 3 h,the castable specimen added with 0.1 mass%magnesia fines has the highest modulus of rupture;the tabular phases appear interwovenly in the specimen;(4)taking the comprehensive properties into account,0.1 mass%of magnesia fines is appropriate,and the addition of sodium meta-aluminate shall be lower than 0.3%.

發文機構：Sinosteel Luoyang Institute of Refractories Research Co. Jiangsu Chianaref Refractory Co. The State Key Laboratory of Refractories and Metallurgy

關鍵詞：CORUNDUMCOLLOIDALALUMINASETTINGacceleratingagentmagnesiaFINESsodiummeta-aluminate

分類號： TQ1[化學工程]