Structure of Periclase-Chromite Refractories After the Service Life in Furnaces for the Processing of Sulfide Raw Material

Abstract

The chemical and mineral compositions of periclase-chromite refractories used in the lining of the furnace for the processing of sulfide raw materials were investigated before and after the overhaul period. It was shown that dusty gas has an effect on the refractories composition and structure, causing saturation of the surface layer with both dust and gas components. Copper, zinc and lead penetrate the materials at a depth of up to 5 mm, whereas traces of elevated levels of sulfur associated with the formation of sulfates Fe₁₂S₁₁O₅₁, MgSO₄ and PbSO₄ were detected at 20 mm deep. Waste refractories can be used as lining at the non-critical components of thermal units and kilns, and as refractory powder to prepare gun mixtures.