Effect of WO3 on Hydration Resistance of CaO Aggregate Prepared by Thermal Decomposition

作者：ZHANG Tao,WEI Yaowu,LI Nan,LI Bingrong,WANG Jinhu

摘要：The application of CaO refractories was limited due to its poor hydration resistance.Introducing appropriate additive is an effective way to improve its hydration resistance.Additive WO3 was introduced in the preparation of CaO aggregates using calcination method in this study.The introduction of WO3 decreased the apparent porosity of CaO aggregates and promoted the grain growth of CaO by the formation of liquid at high temperatures.The average grain size of the specimens with 0.4 mass%WO3 and treated at 1550℃was increased to 51.6μm comparing to 33.5μm that without WO3 additive.As a result,the hydration resistance of CaO aggregate was significantly improved.Besides,WO3 sublimate easily,therefore,less WO3 was remained after the heat treatment.The further increase of WO3 addition had little effect on the hydration resistance of CaO specimens.

发文机构：The State Key Laboratory of Refractories and Metallurgy

关键词：CAOWO3CALCINATIONhydrationresistance

分类号： TQ1[化学工程]