STUDY OF DRYING EFFECT ON MECHANICAL STRENGTH OF BRIQUETTES FROM METALLURGICAL WASTES

Abstract

The paper presents the results of the study of the effect of drying on the strength characteristics of briquettes consisting of 40% oil scale and 60% dust of gas purges of electric steel making by extrusion using the binder Floform 9309 S. Drying was carried out at temperatures of 100, 150, 200 and 250 °C for 60 minutes, followed by settling the briquettes in open air at room temperature for 72 hours with a measurement of compressive strength and dropping every 24 hours. Determination of compression strength of briquettes was carried out according to the procedure GOST 24765–81 on a hydraulic small-sized press PGM-100MG4. The briquette drop strength was determined according to the procedure GOST 25471–82 by three times dropping briquettes on a steel plate from two meters and subsequent screening on a 5 mm screen with determination of class output. The worst strength characteristics are observed in briquettes dried at 250 °C, even in comparison with briquettes that were not dried. The optimal drying temperature is 150 °C, at which the maximum compressive strength is achieved, there is no smoke emission, and the decrease in drop strength compared to non-dried briquettes is insignificant and does not affect the performance of the briquettes. Studies have shown that drying briquettes at 150 °C for 60 minutes provides an optimal combination of high strength characteristics of briquettes and process safety.