Refractory castables for cement kiln mouths and coal injection pipes use andalusite, silicon carbide, corundum, high-quality bauxite as the main raw materials, use cement as a binder and add high-efficiency water reducers and other additives. They have good thermal shock resistance, corrosion resistance and alkali resistance. They are used in cement rotary kiln mouths and coal injection pipes. They have the advantages of high strength, wear resistance, good thermal shock resistance and corrosion resistance.
Cement kiln mouth castables are closely related to coal injection pipe castables. Although they are used in different parts and have different performance requirements, they are almost interchangeable. Kiln mouth castables are mainly aluminum-magnesium spinel series and aluminum-silicon-silicon carbide series, which are divided into three grades: YK-1, YK-2, and YK-3, which correspond to aluminum-magnesium spinel series, corundum-silicon carbide series, and aluminum-silicon-silicon carbide series; coal injection pipe castables can also be divided into two series: aluminum-magnesium spinel series and aluminum-silicon-silicon carbide series, which are divided into three grades: PMG-1, PMG-2, and PMG-3, which correspond to aluminum-magnesium spinel series. , Corundum-silicon carbide system, aluminum silicon-silicon carbide system.
JC/T 1244-2013 “Refractory Castables for Cement Kiln Kilns and Coal Injection Pipes” (hereinafter referred to as the standard), compiled by the National Refractory Products Quality Inspection and Testing Center (Beijing) (hereinafter referred to as the Center), has requirements for grades, marks, technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and quality certificates of refractory castables for cement kiln mouths and coal injection pipes. In this issue, the editor will introduce the index requirements and testing methods of refractory castables for cement kiln mouths and coal injection pipes.
Refractory castables for cement kiln mouths are divided into three grades according to composition: YK-1 (Al2O3≥70% and Al2O3+MgO≥90%), YK-2 (Al2O3≥65% and Al2O3+SiO2+SiC≥90%), YK-3 (Al2O3≥40% and Al2O3+SiO2+SiC≥90%). The refractory castables for cement kiln coal injection pipes are divided into three grades according to the composition: PMG-1 (Al2O3≥70% and Al2O3+MgO≥90%), PMG-2 (Al2O3≥65% and Al2O3+SiO2+SiC≥90%) and PMG-3 (Al2O3≥40% and Al2O3+SiO2+SiC≥90%). Among them, Y, K are the initials of the Chinese pinyin of kiln and mouth, P, M, and G are the initials of the Chinese pinyin of spray, coal, and pipe, and the numbers are classification numbers. 1 corresponds to the aluminum-magnesium spinel system, 2 corresponds to the corundum-silicon carbide system, and 3 corresponds to the aluminum-silicon-silicon carbide system.