Use este identificador para citar ou linkar para este item: https://rd.uffs.edu.br/handle/prefix/1835
Tipo: Artigo de Periódico
Título: Aluminothermic reduction of Cr2O3 contained in the ash of thermally treated leather waste
Autor(es): Wenzel, Bruno München
Zimmer, Tomás Henrique
Fernandez, César Sória
Marcilio, Nilson Romeu
Godinho, Marcelo
Abstract: In this study the viability of utilising ashes with high chromium oxide content, obtained by thermal treatment of footwear leather waste, in the production of low-carbon ferrochromium alloy (Fe-Cr-LC) by aluminothermic reduction was investigated. The following key-factors were selected for process modelling: the quantity of aluminium (Al) employed in the reaction, the iron amount added, the iron compound (Fe and/or Fe2O3) used, and the chromic acid addition. The process was investigated using a 24 full factorial design where the percentage of Cr2O3 reduced was used as the response. Variance analysis was employed to determine the significant effects and to validate the obtained model. The model was useful for finding the optimal operating conditions, including the maximisation of chromium conversion and the gross margin. Both resulted in similar process conditions, with 76.8±12.3% of chromium being reduced to the metallic phase, and 1.65±0.52 USD (kg ash)-1 as the gross margin. The qualities of some alloys obtained were investigated by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy analysis (SEM/EDS). The results showed that the main problem for these alloys in a standard specification was the P and S content, suggesting that a pre-treatment is required.
Palavras-chave: chromium oxide
Footwear leather waste
Aluminothermic reduction
Low-carbon ferrochromium
Statistical experimental design
Optimisation
Resíduos de couro de calçados
Óxido de cromo
Redução aluminotérmica
Idioma: por
País: Brasil
Editor: Brazilian Society of Chemical Engineering
Sigla da Instituição: ABEQ
Tipo de Acesso: Acesso Aberto
URI: https://rd.uffs.edu.br/handle/prefix/1835
Data do documento: 2013
Título: Brazilian Journal of Chemical Engineering
Nímero: 1
Volume do Periódico: 30
Aparece nas coleções:Engenharias

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