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Recovery "in situ" of EAFD metals by means of process INTECT in the laboratoy and pilot plant experimentations

Abstract : This paper summarizes the INTECT process devoted to the recovery of valuable elements from electric arc furnace dust 'EAFD' "in - situ". Acidic leaching of EAFD, separation of solid/liquid, cementation of obtained ZnCl2 solution, precipitation of hydroxy-carbonate, calcinations of Zn-5(CO3)(2)(OH)(6) to obtain ZnO were successful tasks on the laboratory and pilot plant scales. The electrodialysis unit for NaCl splitting, to generate NaOH and HCI, was successful on the laboratory scale, its scaling up to the pilot scale was half success. Manufacturing of 400 tons of briquettes devoted to the study the impact of recycling of leaching's solid residue in the electric arc furnace was successful. Results of industrial trials confirm that including briquettes up to 2% of the charge of EAF doesn't modify the quality of the produced steel. The off gases' chemical composition was almost identical to that of normal operations. Moreover, the physico-chemical characteristics of the dust and the slag weren't modified. In addition, the generated dust had a higher content of Zn and there were no modifications of working conditions. Environmental assessment of the INTECT process is positive since recycling of EAFD will allow the conservation of mineral and energetic resources and will contribute indirectly to lower the CO2 emission.
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Submitted on : Thursday, April 20, 2017 - 10:28:50 AM
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R. Solozabal, A. Arteche, Ndue Kanari, I. Gaballah, A Ugarte. Recovery "in situ" of EAFD metals by means of process INTECT in the laboratoy and pilot plant experimentations. Afinidad, Asociacion de Quimicos, 2005, 62 (519), pp. 373-382. ⟨hal-01510945⟩



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