Tratamento químico da poeira de aciaria elétrica e utilização na síntese de Ferrita de Zinco (ZnFe2O4)

Abstract

This work presents a study on the use of solid inorganic residue from steel industry , electric arc furnace dust (EAFD), using as a basic compound for the production of advanced ceramics, zinc ferrite ( ZnFe2O4 ) through a chemical treatment. The EAFD is a waste by product of steelmaking generated in steel mills that operate electric arc furnaces (EAF) , which is classified as a solid hazardous waste Class I ( NBR / ABNT 10004 , 2004) due to the existence of some heavy metals in their composition. Despite being a material with aggregate economic potential , it contains elements of interest to the industry in significant amount , and the existence of mechanisms able to exploit this potential , this material is still considered a big problem in search of a solution , given its great volume generated annually . Chemical treatment and production of such material for the synthesis of advanced ceramics represent a proposal to be added to efforts to resolve this issue . The obtained results in the chemical waste treatment have shown promise. The process developed was able to extract the material composition such as of the thin carbon , crystalline phases of lead and salt. The recovered material for the synthesis of advanced ceramics allowed obtaining of the zinc ferrite phase and x-ray diffraction the characterization of the samples showed that it is possible to produce single phase with crystallite size in nano dimensions (16nm). The research was able to develop a method for the treatment and application of the material recovered on laboratory scale, envisioning the possibility of an application of noble level to the residue.