The Chemical Composition Of Metallurgical, Ash, Char And Dust

932 Words Oct 5th, 2016 4 Pages
Large amount of unmanaged solid waste particularly from industries in the form of slag, ash, char and dust etc. has resulted in an increased environmental concern. Slags are produced in a very large amount in pyro metallurgical processes, and are huge sources of waste if not properly recycled and utilized. With rapid growth of industrialization, the available land for land-filling of large quantity of metallurgical slags is reducing all over the world and, correspondingly, the disposal cost becomes increasingly higher. Ferrochrome (FeCr) Slag is basically a waste in the production of FeCr which is the most common alloying material for the production of different grades stainless steel. The constituents of chrome ore are essentially Cr2O3, FeO, Al2O3, MgO, CaO and SiO2. Ferrochromium is produced pyrometallurgically by carbothermic reduction of chromite ore (FeO·Cr2O3). The valuable minerals in the Chromium ore are Cr2O3 and FeO, which are reduced to chromium and iron in the furnace, and make up the high-carbon ferrochromium alloy sought. The chemical composition of the ferrochrome slag includes three major elements; silicon (Si), manganese (Mg) and aluminium (Al). Together with their oxides these components make up 83% of the slag. The chromium content in slags is 2–12%, in oxide and metal form. Slag is discarded as a waste material in huge quantities during the ferrochrome production. A relatively small percentage of this material finds application, but the…

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