Extraction of Chromium from Carbon Ferrochromium Residual Wastes

Studying the physical­chemical properties of alloyed metallurgical waste as secondary resource­saving raw materials

“…The respective examined samples probably had the clusters of inclusions of these phases. This is consistent with the results of papers [7,8,13], which noted in the examined samples the presence of a metallic component. The microstructure of the examined slags is heterogeneous, consisting of disordered particles (Fig.…”

“…Other components are represented by Al 2 O 3 , MgO, SiO 2 , CaO, FeO and SiC. In paper [8], authors determined using an X-ray phase diffraction analysis that the slag from alumothermic ferrochromium production consists mostly of the phases of Al 2 O 3 and metallic Cr. Moreover, the diffraction peak of Cr had a relatively high intensity.…”

“…One of the most common of them is the grade R6M5. There are also significant achievements in the research into the composition of slag from metallurgical production for the purpose of further processing, reported by authors of studies [7][8][9][10][11]. The slags of alumothermic production of ligatures of refractory elements are one of the most promising for processing and extraction of high-cost components; results of studying them are given in papers [12,13].…”

Theory and Technology of Manufacturing a Ferroalloy From Carbon Ferrochrome Dusts

“…The specific dust yield also depends on the furnace design [4,5]. The dust yield at the smelting carbon ferrochrome ranges from 12 kg to 150 kg [5][6][7][8] per 1 tonne of the alloy. The dust contains 10-15% of SiO2, 15-43.6% of Cr2O3, 13-33% of MgO, 3-8% of Al2O3, 0.2-4.5% of CaO, 4-6% of FeO, 1-1.2% of S, up to 6.2% of C. The dust formed during the producing ferrochrome in electric arc furnaces contains various metals, such as chromium, zinc, iron, aluminum and magnesium.…”

“…To extract zinc from the ferrochrome dust collected in bag filters, a two-stage leaching procedure is proposed, which allows extracting zinc by 71.2% [12]. A hydrometallurgical method on the processing of carbon ferrochrome dust was suggested, which allows to obtain a chromium concentrate, followed by obtaining chromium metal by aluminothermic reduction [6]. The paper [13] describes the results of electric melting of high-carbon ferrochrome dusts (Aktobe Ferroalloy Plant, Aktobe, Kazakhstan) in a direct current arc furnace (DCAF-1).…”