Briquetting of steel plant wastes suitable for charging in blast furnace

摘要

Steel plants generate huge amount of wastes like iron ore fines, flue dust, granulated slag, mill-scale, coke breeze etc. These wastes are briquetted using organic, inorganic binders and also combination of both. Various organic binders are tried in combination with lime. The briquettes obtained with organic binder have sufficient green strength (+5 drops) but have poor reduction disintegration index (RDI). Whereas the briquettes obtained with a combination of organic and inorganic binders have improved green strength (10 drops) with high cold crushing strength (CCS) but with insufficient RDI. Activated inorganic binder along with refractory grade binder improves the briquette characteristics in terms of green strength, CCS and RDI. The briquettes obtained using this combination of binders have sufficient green strength (3 drops), CCS (above 200 kg/ briquette) and RDI (10-20 percent) which are found to be suitable for charging into blast furnace.