Analysis of Efflorescence of Castables in Walking Beam Reheating Furnace  

作　　者：HUANG Chiapao HUANG Chiichuan WANG Chihsin 

机构地区：[1]China Ecotek Corporation,Kaohsiung 80661,China [2]China Steel Corporation,Kaohsiung 81233,China

出　　处：《China's Refractories》2019年第4期31-34,共4页中国耐火材料（英文版）

摘　　要：When the castable refractory linings are installed without drying out sufficiently and exposed to high humidity for a long time,white fibrous or powdery substance appears on the surface,which is called“efflorescence”.The main reason is the cement of castable refractory linings contacts with C02 and moisture in the atmosphere to form calcium carbonate(CaC03).In general,efflorescence takes place more readily in lightweight castable refractories.In the walking beam reheating furnace construction project,there are many white powdery substances in the walking beams,because the construction procedure causes poor ventilation in the surrounding area,and the internal moisture of castable refractory linings cannot be evaporated effectively.In future,the project programming should consider the environmental humidity and surrounding ventilation.When the castable refractory linings are installed without drying out sufficiently and exposed to high humidity for a long time, white fibrous or powdery substance appears on the surface, which is called "efflorescence". The main reason is the cement of castable refractory linings contacts with CO2 and moisture in the atmosphere to form calcium carbonate（CaCO3）. In general, efflorescence takes place more readily in lightweight castable refractories. In the walking beam reheating furnace construction project, there are many white powdery substances in the walking beams, because the construction procedure causes poor ventilation in the surrounding area, and the internal moisture of castable refractory linings cannot be evaporated effectively. In future, the project programming should consider the environmental humidity and surrounding ventilation.

关 键 词：reheating furnace EFFLORESCENCE lightweight castable refractories 

分 类 号：TQ1[化学工程]