Abstract
High-energy consumption in primary aluminum production (from bauxite ores) makes secondary aluminum production (from metallic raw materials such as scrap and dross) very critical. Aluminum dross, as a waste, arises in pyrometallurgical processes, and it is the mixture of metallic Al, Al2O3, other metal oxides, metal halides, and some other compounds like AlN. Aluminum dross has two subgroups (white and black) with respect to its metallic aluminum content. White dross is a secondary aluminum resource because of its high metallic aluminum content, whereas black dross, having low metallic aluminum content, is generally disposed in dumping areas. In the present study, it was aimed to develop a simple technique to valorize aluminum black dross in the form of alumina-based ceramic materials through pyrometallurgical (calcination) and hydrometallurgical (leaching) operations. Moreover, thermochemical simulations were conducted by using HSC Chemistry 6.12 software to simulate calcination conditions. After leaching experiments, an alumina-based ceramic containing approximately 36.8% Al2O3, 61.4% MgAl2O4 with 1.8% Na2FeO4, which might be available to use as a spinel refractory in steel smelting furnaces, was obtained in the experiment carried out in a solution containing 10 mL H2SO4 and 40 mL distilled water (3.5 M). Moreover, the sinterability of the alumina-based ceramic was investigated at the temperatures from 1350 to 1550 °C. In the sample which was sintered at 1550 °C, a density value of 3.15 g cm−3 and a hardness value of 69.58 HV were measured.
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The authors give thanks to Mr. Emin Akidil for providing raw material.
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Yalova University, Scientific Research Projects Department under grant number 2019/YL/0002.
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U. Cinarli: investigation, software, writing—original draft; A. Turan: conceptualization, methodology, software, validation, supervision, writing—review and editing.
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Cinarli, U., Turan, A. Investigation of Alumina-Based Ceramic Production from Aluminum Black Dross. Mining, Metallurgy & Exploration 38, 257–267 (2021). https://doi.org/10.1007/s42461-020-00344-0
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DOI: https://doi.org/10.1007/s42461-020-00344-0