Justification of manufacturing parameters for extrusion smelt-and-fuel briquetting

Abstract

Extrusion smelt-and-fuel briquettes represent an agglomerate of fine disperse metal and fuel component. The fuel and, simultaneously, binding component is peat. The peat mix is recommended to be compacted using stiff extrusion. Two methods are proposed to improve stiff extrusion of peat composite mixes. The first method is to make a jacket from disperse plastic peat as a surface layer of a briquette. The second method is to use heating equipment, in particular, a thermal snout which allows reducing friction between the formed mass and the internal surface of the equipment. Stiff extrusion agglomeration of peat mineral composite mixtures and induced oscillatory drying of wet briquettes allows production of high-quality smelt-and-fuel briquettes. Such technology of disperse material agglomeration is applicable to various metallurgy waste (dust, slag, etc.). The studies into properties of extrusion smelt-and-fuel briquettes including peat and disperse metalcontaining waste at a ratio from 1:3 to 1:7 by dry weight allowed drawing some conclusions. The composition density in blending varies within the ranges of 1370–1390 kg/m3, and their density after ex trusion ranges as 1836–2160 kg/m3. The porosity factor of the composite mix during extrusion drops by 1.5 times, which contributes to denser compaction of peat and aggregate and improves the structure of briquettes. Extrusion is carried out by two methods: making of a disperse peat jacket and using heating snouts with moulding equipment.