Caracterização e adição de poeira de aciaria elétrica em ferro-gusa

Abstract

ResumoO objetivo desse trabalho é estudar a redução dos óxidos de ferro e zinco contidos na poeira de aciaria elétrica (PAE), na forma de briquete, por um banho de ferro-gusa líquido com elevado teor de silício. A poeira de aciaria foi caracterizada através das seguintes técnicas: análise química, análise granulométrica, difração de raios X, microscopia eletrônica de varredura (MEV) e análise de microrregiões por EDS. Os experimentos foram realizados em escala de laboratório em um forno tubular vertical, com um fluxo argônio. Periodicamente, foram retiradas amostras do banho para a verificação dos teores de silício do banho. Os óxidos de zinco, ferrita de zinco e outros óxidos foram reduzidos, volatilizados e coletados pelo sistema de limpeza de gás, montado na parte superior do forno. Foi possível obter picos no EDS, que identificaram uma composição de, aproximadamente, 55,00% de zinco, além de conseguir reduzir o FeO pelo silício e carbono do ferro-gusa.Palavras-chave: Pó de FEA, briquetagem e reciclagem. Abstract The aim of this work was to study the iron oxides and zinc reduction of from Electric Arc Furnace Dusts (EAFD), added in the form of a briquette with high silicon content present in hot metal bath. The EAFD will be. This study has begun with the EAFD characterization by chemical analysis, particle size determination, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy

<b>Steel waste used in reducing emissions of nitrous oxide

“…A characteristic peak at 2Ɵ = 26.60° (Xpert N. 01-0649), identified in the lamination waste, confirms the presence of alpha-quartz. The presence of silicon oxide (quartz) in the steel wastes was also reported by other authors (Grillo, Tenório, & Oliveira, 2013;Lima, Reis, & Borges, 2013). It may also be enhanced that rhodium was detected in the qualitative analysis of XRF but it was not registered by XRD, probably due to its low content in the wastes.…”

Study on Effect of EAFD Particulate Reinforcement in AA7075 Aluminum Matrix Composites

“…The results reveal that EAFD has other peaks for minority elements, but in insufficient amounts for appropriate detection. Other phases tipically found in the literature 2,4,7,8 and the peaks overlap can interfere in the identication of phases belonging to the spinel group 27 .…”

“…The type of scrap metal melted inside the electric arc furnace (EAF) determines the chemical composition of the dust, which is defined as a rich material in ferrous or nonferrous metal. EAFD is composed of iron and zinc oxide, which is volatilized, and also calcium, chromium, magnesium, sílica and, other toxic compounds as lead and cadmium 2,3,4,5 .…”

“…Among the suggested methods for recycling this solid waste, pyrometallurgical processes, as well as its application in the ceramic materials field, have been widely used in industry. However, about 60% of dust produced all over the world is still being stored in yards 4,6,10,11,12,13 .…”

“…Many solutions have been proposed for the technical utilization of the EAFD in several fields. The main approaches for recycling the waste are related to pyrometallurgical process, by agglomeration of dust and briquette manufacture to recovery of iron contained in the EAFD 4 . Havlik et al 7 study efficiency of recovery of zinc with sulfuric acid as the leaching agent.…”