High-alumina technogenic raw material

Abstract

The substance composition, properties, and areas for use of five large scale varieties of technogenic high-alumina mineral raw materials are considered: aluminothermal slags, organic synthesis catalysts, abrasive slurries, aluminium slags and alumina dust. With combined use on the basis of this secondary raw material it is possible to produce more than twenty forms of different product:Currently in the Ural region a number of scientific organizations and industrial enterprises are participating in the fulfilment of Regional and Federal programs for processing technogenic formations. In 2008 the presidium of the Russian Academy of Sciences developed and approved a comprehensive program for study and assimilation of untraditional sources of mineral raw material, including technogenic formations. Main attention in the academic program is devoted to high-alumina natural and technogenic raw material sources: minerals of the kyanite, andalusite, silimanite, kaolinite and pyrophilite groups, aluminosilicate waste from thermal power engineering, high-alumina slags, slurries, dust, etc. Within the scope of fulfilling these programs there is research work, a study of substance composition and properties of mineral raw materials, and promising areas are being developed for use of the most valuable varieties of technogenic high-alumina materials. Among the latter are the following large-scale technogenic formations are of greatest practical interest (limits of Al 2 O 3 content, wt.%, are shown in brackets): aluminothermal slags in the production of the majority of ferroalloys and master alloys (50 -85), wastes of catalyst production or synthetic rubber (65 -75), corundum slurry from abrasive production (82 -96), dust from alumina calcining furnaces (90 -97), and metal-mineral waste from the production of secondary aluminum (60 -72).Technogenic "deposits" are primarily a potential raw material for synthesis of refractories, heat-resistant, and ceramic fuzed materials of different composition: alloyed corundum, mullite-corundum, spinel, codierite, etc. In view of the wide range of mechanical, thermal and chemical properties many varieties of technogenic mineral raw materials may be used effectively, not only in the refractory branch, but also in the production of abrasives, binders, heat insulation and other functional materials and objects [1 -3]. In order to develop effect areas for recycling secondary mineral resources complete information si necessary about the substance, grain size composition and physicochemical properties of each variety of technogenic polyphase and often polydispersed technogenic raw material. ALUMINOTHERMAL SLAGS FROM FERROALLOY AND MASTER ALLOY PRODUCTIONOAO Klyuchev Ferroalloy Plant is the sole enterprise in the RF and CIS producing more than thirty named unique ferroalloys and master alloys by the method of aluminothermal reduction of metals from oxides and other com-. 3 OOO Klyuchev Enrichment Plant, Dvurechensk, Sverdlovsk Region, Russia. 4 OAO UK RosStetsSplav, Yekaterinburg, Russia. 5 OOO NPO V...

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