Reciclagem da poeira de aciaria elétrica na sinterização de minério de ferro visando a eliminação de zinco.

Telles, Victor Bridi

doi:10.11606/d.3.2010.tde-10012011-142919

Cited by 8 publications

(14 citation statements)

References 18 publications

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“…The zinc concentration of 10.63% in EDS technique, was identified as ZnO and associated with iron as franklinite, according to the results obtained by X-ray diffraction. These results are in agreement with previous works reported at the literatures 24,25 . The quantity of oxygen and carbon detected by EDS technique are not reliable since a few fields of the sample were analyzed however, mass balance of these elements were used to estimate the elements of inaccurate determination.…”

Section: Results Of Chemical Characterizationsupporting

confidence: 94%

“…The results obtained by X-ray diffraction show the major elements are carbon, oxygen (by mass balance), zinc and iron. As presented in Figures 1, 2, this study confirms the range of the main components presented in the self-reducing agglomerates of EAF dust obtained by previous works [6][7][8][24][25][26][27] besides the higher concentrations of zinc and iron based phases. Figure 2 shows the mean result for spectra obtained for each part of the pellet using the software Match v.1.0, and the composition of each phase calculated by the software.…”

Section: Results Of Chemical Characterizationsupporting

confidence: 89%

“…A summary of the average elemental analysis obtained by different techniques is presented in Table 1 for self-reducing pellets of EAF dust. In this kind of material, the carbon content is higher than the necessary amount for the reduction of the oxides in selfreducing pellets of EAF (usually until 15%) and contributes to dilute the large zinc amount present in the EAF dust and enable the production of agglomerates suitable to be used as raw materials for processes based on self-reducing technology 17,[24][25][26][27] .…”

Section: Results Of Chemical Characterizationmentioning

confidence: 99%

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Characterization and three-dimensional reconstruction of pores of self-reducing pellets done by EAF dust

Rocha

Castro

2013

Mat. Res.

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This work focused on the characterization physical and microstructural of the self-reducing pellet made of Electric Arc Furnace (EAF) dust using different low cost techniques. The serial sectioning technique was used to evaluate detailed measurements of pore connections, tortuositiy of pores and porosity distribution. The chemical analysis using Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Scanning Electron Microscopy (SEM), Optical Microscopy (OM) and X-ray diffraction were carried out to identify the common phases presented in EAF dust agglomerate. It was observed that the pellet phase composition is formed by iron as magnetite, metallic iron, wustite, and zinc ferrite. The visualization of the reconstructed 3D microstructure provided average qualitative and quantitative analysis of the porosity (41.61%), a consistent result and in accordance with that obtained by pycnometry technique (41.53%). As expected, these results are more precise when compared with the result obtained by two-dimensional technique (23.41%). In addition, it was calculated the value of the tortuosity parameter (0.84) that suggested a morphological structure closest to cylindrical shape.

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Section: Results Of Chemical Characterizationsupporting

confidence: 94%

Section: Results Of Chemical Characterizationsupporting

confidence: 89%

Section: Results Of Chemical Characterizationmentioning

confidence: 99%

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Characterization and three-dimensional reconstruction of pores of self-reducing pellets done by EAF dust

Rocha

Castro

2013

Mat. Res.

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“…Por consequência, esse elemento de baixo ponto de fusão passou a fazer parte da composição normal do pó de aciaria elétrica (PAE) a partir de fatores como: vaporização seguida de condensação em partículas ejetadas; oxidação na presença de CO2; e ejeção de partículas do espinélio ZnFe2O4 ou (Mn,Zn)Fe2O4-Fe3O4 a partir da escória [1,2]. Por causa disso, o PAE tornou-se um importante subproduto rico em zinco, e, por essa razão, diversos processos já foram desenvolvidos a fim de reciclá-lo.…”

Section: O Forno Waelzunclassified

Modelo Termodinâmico Para O Forno Waelz

Reis¹,

Heck²

2018

ABM Proceedings

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ResumoO pó de aciaria elétrica (PAE) é um importante subproduto da indústria siderúrgica devido ao seu alto teor de Zn. Assim, tecnologias vêm sendo desenvolvidas visando seu aproveitamento, sendo o forno Waelz a mais difundida delas atualmente. Sua operação, por contar com um forno rotativo de grandes dimensões, que abriga uma infinidade de fenômenos físico-químicos, apresenta difícil previsibilidade ab initio. Por essa razão, este trabalho faz uso de uma ferramenta avançada da termodinâmica computacional, destinada à modelagem de processos, chamada SimuSage, a fim de modelar o seu comportamento. Para a criação do modelo utilizou-se também uma base de dados termodinâmicos advinda do software FactSage e a plataforma Lazarus. Com base em dados e resultados operacionais da literatura, foi possível realizar simulações no modo adiabático e comparar os resultados com os da prática industrial. Constatou-se uma grande sensibilidade do modelo com relação à quantidade de ar de entrada considerada no sistema, mas, também, boa aproximação dos resultados com relação à composição química dos produtos Óxido Waelz e Escória Waelz. Palavras-chave: Pó de aciaria elétrica; Forno Waelz; SimuSage. THERMODYNAMIC MODEL FOR THE WAELZ KILN AbstractThe electric arc furnace dust (EAFD) is a by-product of the steel industry due to its high content of Zn. Thus, technologies have been developed aiming for its use, and the Waelz Kiln is the most widespread of them today. However, counting on a very large rotary kiln that houses an infinity of physico-chemical phenomena, its operation is difficult to predict ab initio. For this reason, this work uses an advanced tool of computational thermodynamics, designed to process modelling, called SimuSage in order to model its behavior. To create the model, a thermodynamic database coming from the FactSage software and the Lazarus platform were also used. Based on operational data and results from de literature, it was possible to perform simulations on adiabatic mode and compare its results with the industrial practice. A high sensibility of the model was found related to the amount of input air considered in the system, but also good approximation of results regarding the chemical composition of products, Waelz Oxide and Waelz Slag.

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“…Figura 4 -Processo de formação de poeira no forno elétrico a arco (25) . (30) Telles (2010) (31) Vargas, Masuero e Vilela (2006) (32) Franklinita…”

Section: Poeira De Aciaria Elétricaunclassified

Reciclagem de poeira de aciaria: estudo da redução da poeira de aciaria LD, elétrica e ferrita de zinco.

Junca¹

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Resumo Uma grande quantidade de poeiras e fumos contendo óxidos de ferro, zinco, alumínio, cálcio, chumbo, magnésio e cádmio são habitualmente gerados durante a produção do aço em usinas siderúrgicas semiintegradas. Processos hidrometalúrgicos e pirometalúrgicos têm sido desenvolvidos para o tratamento da poeira de aciaria elétrica (PAE). O processo Waelz, que recupera parte destes resíduos por meio de reações metalúrgicas de redução e oxidação em um forno rotativo, é uma tecnologia de destaque empregada para a recuperação dos metais voláteis, e tem sido a mais usada nos últimos 40 anos. Neste trabalho, foi realizado um estudo termodinâmico do processo Waelz, visando à otimização das condições metalúrgicas necessárias para garantir a recuperação dos metais voláteis (em especial zinco), de forma a assegurar a minimização de impactos ambientais e maximização de opções de processamento para a recuperação do zinco contido. As variáveis cinéticas foram estudadas por meio da execução de uma serie de 6 experimentos, englobando os principais fatores do processamento, tais como: tipo de redutor e tempo/temperatura de processamento. Também foi avaliado o comportamento mecânico das pelotas para cada formulação. Caracterizações por meio de microscopia eletrônica com microanálise via EDS, difração de raios X, fluorescência de raios X, análise granulométrica a laser, resistência à compressão, porcentagem de matéria volátil, carbono fixo e cinzas foram empregados. Palavras-chave: Pelotas autorredutoras; Recuperação do zinco; Tratamento de resíduo de aciaria; Processo Waelz. Abstract A high amount of residues such as dust and fumes containing iron oxides, zinc, aluminum, calcium, lead, magnesium and cadmium are usually generated during the steel production in steel mills, which produce it from scrap melting. Hydrometallurgical and pyrometallurgical processes have been developed to the treatment of electric arc furnace dust (EAF). The Waelz process, that recovers part of these residues through metallurgical reactions of oxidation and reduction in a rotary kiln, is a leading technology used for the recovery of volatile metals, and has been widely used over the past 40 years. In this work, an initial thermodynamic and kinetic study of the Waelz reduction process was conducted, aiming to optimize the metallurgical conditions needed to ensure the recovery of volatile metals (especially zinc) and therefore assure the minimization of environmental impacts and maximization of more sustainable processing options and with higher added value due to the increase of zinc recovery from the dust and metallurgical residues. Kinetic variables were studied by running a series of six experiments, covering the main processing variables such as content and type of the binder, content and type of the reducer and processing time/temperature. The behavior and thermomechanical properties will also be assessed. There were used characterizations by electron microscopy, X-ray diffraction, X-ray fluorescence, particle size analysis with laser, compressive ...

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Reciclagem da poeira de aciaria elétrica na sinterização de minério de ferro visando a eliminação de zinco.

Cited by 8 publications

References 18 publications

Characterization and three-dimensional reconstruction of pores of self-reducing pellets done by EAF dust

Characterization and three-dimensional reconstruction of pores of self-reducing pellets done by EAF dust

Modelo Termodinâmico Para O Forno Waelz

Reciclagem de poeira de aciaria: estudo da redução da poeira de aciaria LD, elétrica e ferrita de zinco.

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