2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 9. Iron and Steel, Metals and Alloys

Editors:Kongoli F, Conejo A, Gomez-Marroquin MC
Publisher:Flogen Star OUTREACH
Publication Year:2017
Pages:242 pages
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Cleaning Process of the Coarse Steel Maker Sludge with Recovery of the Metallic Content and Consequent Carbon Sequestration

    Erivelto Souza1; Fernando Gabriel Silva Araujo2; Cristovam Paes Oliveira3; Jose Emanuel Lopes Gomes3;
    Type of Paper: Regular
    Id Paper: 200
    Topic: 2


    This work describes a process of steel waste treatment— primarily steelmaking— of thick sludge, through a technique of ultrasonic bombing aiming to recover the metal content of this waste. During the manufacturing process of steel in LD converters, the liquid iron designed in oxidizing atmosphere converter, solidifies in the form of small spheres with a wide range of sizes. However, not all the spheres are perfect, because some will ultimately not be able to complete spheres formation due to variations in size, cooling speed, and surface tensions. The smaller the size of the spherical particles, the greater the degree of oxidation, which forms a dust that generates a "cement" ligand upon contact with water, and aggregates the other spheres with non-metallic particles involved in the production of steel (slag; Coke; Cao; etc.). This "dust" fills even some of the cavities’ hollow spheres. After washing of gases, the "sludge" formed will contain steel bead, which will then be bonded with each other and with impurities through the aggregate action of fine particles, here called "dust". The technique in question consists of the application of ultrasonic waves on a pulp, formed by the addition of water to the thick sludge. This ultrasonic bombing promotes dispersion of micro-particles of sludge binders and, consequently, of larger particles, causing individualization and cleaning of the interior of the hollow particles. After the break, the particles that make up the pulp will be completely released. The pulp is then forwarded to a gravity concentration step for recovery of spherical particles of high metal content (90 to 96% Fe). Each ton of recovered metallic material is used as scrap in steel fabrication while avoiding the consumption of 1.4 t of ore, 1.5 t of CO2 generated, and 440 kg of Coke consumption, to the same productivity of steel.


    CO2; Dust; Emissions; Gas; Industry; Optimization; Recovery; Steel; Sustainability; Technology; Waste;


    [1] Z. Wozniacki, T. Telejko, R. Kenig, Sintering as the method of utilization of steelmaking dusts with a high content of zinc oxides. Hutnik-WH 81, 166–171 (2014);
    [2] Steel Dust Recycling, Waelz Kiln Technology. Available: http://www.globalsteeldust.com/waelz_kiln_technology [06/10 2016]
    [3] N.G. Gandiaga, B.G.E. Vergara, Proceedings of the “Rewas” 99: Global symposium on recycling, waste treatment and clean technology, TMS, INASMET, San Sebastian, (1999) pp. 1511–152
    [4] M. Holtzer, A. Kmita, A. Roczniak, The recycling of materials containing iron and zinc in the oxycup process. Arch. Foundry Eng. 15, 126–130 (2015)
    [5] M.A.V. Abdel-Latif, Fundamentals of zinc recovery from metallurgical wastes in the enviroplast process. Miner. Eng. 15, 945–952 (2002)
    [6] AUMÔNIER, J.; JUCKES, L.M.; TRAICE, F.B.; A Caminho da Eliminação Total de Bota-Foras. Seminário sobre Processamento, Utilização e Descarte de Resíduos na Indústria Siderúrgica. Balatonszéplak, Hungria. 1996.
    [7] BERGMANN L.; HATFIELD, H.S.; Ultrasonics and their scientific and technical applications, John Willey and Sons, New York, 1938.
    [8] CASTRO NETO, P.P..; Modelo para avaliação qualitativa e quantitativa de resíduos sólidos industriais. São Paulo, 1987. + anexos. Dissertação (Mestrado) - orientada por Pereira, Helena A dos S Lima, FSP/USP 0389.
    [9] Metallurgical Plant and Technology - International; N.º 2, 2004, April.
    [10] OLIVEIRA, M.B.P.; SCHALCH, V.; Processos de reciclagem de resíduos sólidos industriais. In: Congresso de Iniciação Científica e Tecnológica em Engenharia, 13, São Carlos, 1994. Anais. São Carlos: EESC-USP, 1994. p.55. EESC/USP 0439.
    [11] Paul Wurth do Brasil Ltda. PRIMUS®, Processo para reciclagem de sub-produtos. Disponível em: http://www.paulwurth.com.br/novidades.htm. Acesso em: 20/02/2003.
    [12] SILVA, H.V.O.; Programa de Gestão de Resíduos Industriais: Do Planejamento à Auditoria Ambiental. 20o Congresso Brasileiro de Engenharia Sanitária e Ambiental. 2000. Available in: http://www2.ciesp.org.br/bolsa/index2.htm. Acess in: 01/02/2003.
    [13] SOUZA, E. L. Estudo e Desenvolvimento de um Processo de Tratamento de Resíduos Siderúrgicos Através da Técnica de Bombardeamento Ultra-Sônico. Doctoral Thesis. 2006.
    [14] SOUZA, E. L., GOMES, J. E. L., ARAÚJO, F.G.S., OLIVEIRA, C.P. Improvement of Metallic Joint Electrical Conductivity Using a Novel Conductive Paste Produced from Recycled Residues. Revista Escola de Minas. 2006, Vol. 59.

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    Souza E, Araujo F, Oliveira C, Lopes Gomes J. (2017). Cleaning Process of the Coarse Steel Maker Sludge with Recovery of the Metallic Content and Consequent Carbon Sequestration. In Kongoli F, Conejo A, Gomez-Marroquin MC (Eds.), Sustainable Industrial Processing Summit SIPS 2017 Volume 9. Iron and Steel, Metals and Alloys (pp. 151-165). Montreal, Canada: FLOGEN Star Outreach