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Singe Phase Iron Boride (Fe2B) Particle Production from Pickling Wastes by One Step Carbothermic Reduction

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Abstract

Removal of oxides on the surface of flat steels with hydrochloric acid before galvanising is a common process in steel manufacturing. During this process, a significant amount of iron ions accumulates in the spent acid solution. Recovery of metals and acids from pickling solutions is essential for environmental protection and the economy. Therefore, different techniques are developed for acid and metal recovery from spent pickling solutions. Spray roasting is one of the most widely used techniques for the recovery of HCl from pickling solutions. In this process, while HCl is recovered by evaporation, iron is obtained as iron oxide (FexOy) granules. In this study, the production of iron boride (Fe2B) from high purity iron oxide produced as pickling waste was investigated. Single-phase nanocrystalline Fe2B production by a one-step carbothermic reduction process using waste FexOy and diboron trioxide (B2O3) has been carried out for the first time. The effect of temperature (1273–1473 K) and time (30–270 min) on Fe2B production at constant stoichiometric weight ratios of FexOy/B2O3/C = 3.47/1.56/1.53 was investigated. The produced particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and a vibrating sample magnetometer (VSM). XRD results showed that synthesis temperature and duration primarily control Fe2B formation. Fe2B particles with a crystalline size of 39 nm were successfully produced at 1473 K and 270 min. The saturation magnetization, permanent magnetization, and coercivity values of the produced nanocrystalline alloy were determined as 137 emu/g, 22.51 Oe, and 0.812 emu/g, respectively.

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  1. Department of Metallurgical & Materials Engineering, Hitit University, 19030, Corum, Turkey

    Levent Kartal

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Kartal, L. Singe Phase Iron Boride (Fe2B) Particle Production from Pickling Wastes by One Step Carbothermic Reduction. J. Sustain. Metall. 9, 1660–1669 (2023). https://doi.org/10.1007/s40831-023-00755-5

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