简介:Thepropertiesofcastablesforironmaintroughhavebeenimprovedbymeansofincreaingthecastable'scriticalsizeandaddingexpandablemate-rial,TheprecastblocksmadefromthiscastablehavebeenusedasthescumwallofthemaintroughinBaosanI&sCo.,Whichhavesolvedtheproblemsusuallyoccurredinthisarea,suchasseriousero-sion,easycrakingandlowerservicelife.