A PROCESS FOR THE MANUFACTURE OF COMPOSITE BRIQUETTES OF IRON AND STEEL PLANT WASTES BY COLD BRIQUETTING

摘要

The present invention provides a process for the manufacture of composite briquettes of iron and steel plant wastes by cold briquetting, which are otherwise unutilised and are an environmental hazard. The steel plant wastes used in cold briquetting of the present invention are in a combination of iron ore fines of - 6 mm size, flue dust of - 3 mm size, mill scale of - 6 mm size and coke fines of - 6 mm size. The combination of inorganic binders used on the basis of wt % of charge materials are: pyrophilite in the range of 5 - 10%, cement/granulated slag of (-100µ size) in the range of 5 - 10% and activated commercial grade sodium silicate (Na2O :SiO2 ≈1:1) in the range of 3 - 7%. The composite briquettes obtained by the process of the present invention using different binder combinations have sufficient green strength (above 4 drops), cold-crushing strength of above 250 kg/briquette for cylindrical briquettes and above 130 kg/briquette for elliptical briquettes and RDI of below 30%, and are suitable for charging into blast furnace for further processing.