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Recycling of oxides from industrial ash waste for the steel-making industry.

Development of recycling technologies for the production of
steel-making modifiers from industrial ash waste instead of
natural products such as caf2, cac2, al, mg and others.

The target of the proposed project is the development and optimization of technology for processing of slags, scrap, ash and other powder wastes in order to re-use them - in the steel-making industry. The main advantages of the suggested modifiers are: a) Today's customers (in the steel manufacturing industry) use traditional modifiers that are: not-effective, heavily polluting and expensive in comparison to the suggested new modifiers. Examples: - Customers use Calcium Fluoride (environmental hazard) to reduce the viscosity of steel slag. - Applying magnesium powder and Calcium Carbide for sulphur removal. - Applying Ferrous alloys of various types for de- oxidization. - Using conventional ferrous scrap for steel manufacturing. b) The suggested new modifier will improve the customer manufacturing process (being more efficient, effective and economic) and eliminate environmental problems. The developed new modifiers will be: 1. Ferrous Oxide - Carbon briquettes with exothermal additives, which substitute ferrous scrap and reduce energy consumption during the steel making process. Ferrous oxide - carbon briquettes are cheaper in comparison with conventional scrap. 2. Steel slag formers - non-ferrous metal granules and oxide mixtures made from industrial wastes. They are applied to protect, refine and to de-oxidize molten steel at the end of the processing steps. The new composition of mixtures ensures high effectiveness and consequently less consumption in comparison to the existing modifier (mixture 'Scorialit SPH'). Our product is prepared from dust wastes and granules and costs less than other conventional mixtures. 3. Aluminium waste briquettes for reducing steel slag viscosity substitute calcium fluoride in the steel making process. They are at least 50% cheaper than calcium fluoride; however the quality of steel is at the same high level. Summary: The advantages of the suggested steel manufacturing modifiers are as follows: 1. High effective modifiers with new compositions, by applying magnesium oxides. 2. Low price of our modifiers in comparison to conventional products such as fluoride, calcium carbide and others. 3. Replacement of usual ferrous scrap by low price, oxide- carbon briquettes with exothermic additives. 4. Ecologically-friendly modifiers without fluoride content. For production of these products the special powder technology is offered and will be developed. The main feature of PM technology offered is the development of the new flexible shear warm compaction technology. The main operations of this technology are mixing and heating of the mixture due to exothermic reactions effect, shear warm compaction of the mixture with definite composition, drying and packing of products. The new shear warm compaction technique ensures obtaining high density and high strength of briquettes that consist of reactive ingredients. This flexible technology is applied: 1. To compact ferrous oxide-carbon briquettes with exothermic additives. 2. To compact briquettes from reactive aluminium slag dust wastes. 3. To compact high density metal pallets (bars, wires and others) from scrap and powders. The shear forming (compaction) technology will be combined with granulation operation in order to obtain non-ferrous metal granules in a single production cycle of preparing of steel slag formers of various types. Keywords: recycling, metallurgy, slag.
Project ID: 
2 609
Start date: 
01-01-2002
Project Duration: 
36months
Project costs: 
850 000.00€
Technological Area: 
Recycling, Recovery
Market Area: 
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Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.