Build-ups in careless induction furnaces used to melt cost iron consist mainly of oxides. Their reduction requires careful study, because they can be caused by the raw materials, the furnace and its lining, the operation of the furnace, or interactions among any combination of these factors. This article attempts to provide an overview of this phenomenon. Analyses of build-ups taken from furnaces partially illustrate the difficulty of the subject. Study of the physical and thermochemical properties of the materiel is a first approach to the problem. The manner in which the furnace and lining are designed, installed and used provides another approach to the problem. Solutions that can avoid or reduce these build-ups are proposed for use by foundrymen.
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