INCORPORATION OF RESIDUAL DUST GENERATED IN STEP OF ALUMINA ELECTROFUSED PRODUCTION IN RED CERAMIC.

Reference Presenter Authors
(Institution)
Abstract
06-207 Geovana Carla Girondi Delaqua NICOLITE, M.(Universidade Estadual do Norte Fluminense - Darcy Ribeiro); Delaqua, G.C.(Universidade Estadual do Norte Fluminense Darcy Ribeiro); Amaral, L.F.(Universidade Estadual Norte Fluminense Darcy Ribeiro); Vernilli, F.(Escola de Engenharia de Lorena); Vieira, C.M.(Universidade Estadual do Norte Fluminense Darcy Ribeiro); The abrasive grain industry uses bauxite as the main raw material for the electrofused alumina production. In this process, bauxite along with other raw materials are heated in electrofusion furnaces reaching temperatures above 2000°C. The exhaust system used in this furnace capture fine particles generated in the power of the raw materials. Due to the small particle size of this powder cannot be reinserted into the process and must therefore suffer the disposal. In this sense, it becomes necessary to develop alternatives, which aim to recycle and/or reuse of industrial waste. The inclusion of waste in production cycles are emerging as an alternative form of reuse, which is interesting both in the environmental and economic aspect. Therefore, the technical viability of the incorporating this residue in the productive cycle of red ceramic becoming a decisive factor in the sustainable development, may also generate economic benefits for both companies. This study evaluates the effect of the incorporation of particulate matter generated in the electrofusion alumina step an abrasive industry in the physical and mechanical properties of the ceramic. Also, determine the amount of residue limit that can be incorporated into the ceramic bodies, where in the limit is based on ratio limits set by standards and recommendations for brickwork. Ceramic bodies containing two kaolinite clays and sand Campos dos Goytacazes municipality were prepared with 0; 2.5; 5; 7.5 and 10 wt.% waste. Rectangular specimens were molded by uniaxial pressing at 34 MPa followed by firing at a temperature of 750 and 950°C. The properties evaluated are: linear shrinkage, water absorption and flexural rupture strength (three points). The results indicated that the use of the residue in the manufacture of sealing blocks is totally viable.
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