METHOD FOR DISPOSING OF IRON-BEARING PARTICULATE WASTES

摘要

1466188 Recovering iron from waste matter FERRO-CARB AGGLOMERATION Ltd 7 May 1974 [14 May 1973 19 Nov 1973] 20045/74 Heading C7D Particulate waste containing carbon and at least 5% of Fe is mixed with a bituminous binder which is free of combustibles volatile at 500‹F and has a ball and ring softening point below 212‹F so that the mixture contains 2-15% of binder. Briquetted mixture is then heated in a gas containing at least 10% of oxygen at 350-600‹F for 30-90 minutes and the briquettes are then utilized in a subsequent operation such as steelmaking. The starting material may be a mixture of blast furnace and basic oxygen furnace dust with mill scale, flux and coke. After the above thermal treatment the briquettes may be heated to above 1400‹F in an inert atmosphere to reduce the content of volatile matter to below 3%.