Determining the physical-chemical characteristics of the carbon-thermal reduction of scale of tungsten high-speed steels
DOI:
https://doi.org/10.15587/1729-4061.2018.125988Keywords:
alloyed technogenic wastes, high speed steel, carbon-thermal reduction, microscopic analysis, carbide formationAbstract
We determined that scale of the high-speed steel R18 is composed of the phases of Fe3O4, Fe2O3, FeO, with the presence of alloying elements as the replacement atoms. The microstructure is disordered and non-uniform. In the examined area, in addition to Fe, we revealed the presence of, % by weight: W – 16.34, Cr – 2.68, V – 1.82, and others. The content of O was 15.32 %. It was established that the reduction of scale at 1,523 K proceeds with the formation of α-Fe and carbides Fe3W3C, (Fe, Cr)7C3, W2C, V2C, Fe3C, Fe2C. Manifestation of carbides of alloying elements decreased with an increase in the degree of reduction. The microstructure of reduction products is heterogeneous, containing particles with a different content of alloying elements and has a spongy structure. The conditions are provided for the absence of phases subject to sublimation. We conducted experimental-industrial tests of using the metallized scale while smelting high-speed steel with a degree of disposal of alloying elements at the level of 92‒94 %. Improvement of environmental safety was implemented by the replacement of reduction melting with the newest methods of powder metallurgy employing the solid-phase reduction.
References
- Tarasov, A. V. (2011). Mineral'noe syr'e, novye tekhnologii i razvitie proizvodstva tugoplavkih redkih metallov v Rossii i stranah SNG. Cvetnye metally, 6, 57–66.
- Jung, W.-G. (2014). Recovery of tungsten carbide from hard material sludge by oxidation and carbothermal reduction process. Journal of Industrial and Engineering Chemistry, 20 (4), 2384–2388. doi: 10.1016/j.jiec.2013.10.017
- Golovchenko, N. Y., Bairakova, O. S., Ksandopulo, G. I., Aknazarov, S. K. (2011). Reception ferrotungsten from wolframite concentrate by alumimotermic method. Eurasian Chemico-Technological Journal, 13 (3-4), 205–212. doi: 10.18321/ectj86
- Leont’ev, L. I., Grigorovich, K. V., Kostina, M. V. (2016). The development of new metallurgical materials and technologies. Part 1. Steel in Translation, 46 (1), 6–15. doi: 10.3103/s096709121601006x
- Mechachti, S., Benchiheub, O., Serrai, S., Shalabi, M. (2013). Preparation of iron Powders by Reduction of Rolling Mill Scale. International Journal of Scientific & Engineering Research, 4 (5), 1467–1472.
- Vyatkin, G. P., Mikhailov, G. G., Kuznetsov, Y. S., Kachurina, O. I., Digonskii, S. V. (2013). Reduction of iron oxides by wet gas in the presence of carbon. Steel in Translation, 43 (4), 161–167. doi: 10.3103/s0967091213040153
- Kozyrev, N. A., Bendre, Yu. V., Goryushkin, V. F., Shurupov, V. M., Kozyreva, O. E. (2016). Termodinamika reakciy vosstanovleniya WO3 uglerodom. Vestnik Sibirskogo gosudarstvennogo industrial'nogo universiteta, 2 (16), 15–17.
- Ryabchikov, I. V., Belov, B. F., Mizin, V. G. (2014). Reactions of metal oxides with carbon. Steel in Translation, 44 (5), 368–373. doi: 10.3103/s0967091214050118
- Shveikin, G. P., Kedin, N. A. (2014). Products of carbothermal reduction of tungsten oxides in argon flow. Russian Journal of Inorganic Chemistry, 59 (3), 153–158. doi: 10.1134/s0036023614030206
- Liu, W., Song, X., Zhang, J., Zhang, G., Liu, X. (2008). Thermodynamic analysis for in situ synthesis of WC–Co composite powder from metal oxides. Materials Chemistry and Physics, 109 (2-3), 235–240. doi: 10.1016/j.matchemphys.2007.11.020
- Smirnyagina, N. N., Khaltanova, V. M., Kim, T. B., Milonov, A. S. (2012). Thermodynamic modeling of the formation of borides and carbides of tungsten, synthesis, structure and phase composition of the coatings based on them, formed by electron-beam treatment in vacuum. Izvestiya vysshih uchebnyh zavedeniy. Fizika, 55 (12 (3)), 159–163.
- Ryabchikov, I. V., Mizin, V. G., Yarovoi, K. I. (2013). Reduction of iron and chromium from oxides by carbon. Steel in Translation, 43 (6), 379–382. doi: 10.3103/s096709121306017x
- Simonov, V. K., Grishin, A. M. (2013). Thermodynamic analysis and the mechanism of the solid-phase reduction of Cr2O3 with carbon: Part 1. Russian Metallurgy (Metally), 2013 (6), 425–429. doi: 10.1134/s0036029513060153
- Simonov, V. K., Grishin, A. M. (2013). Thermodynamic analysis and the mechanism of the solid-phase reduction of Cr2O3 with carbon: Part 2. Russian Metallurgy (Metally), 2013 (6), 430–434. doi: 10.1134/s0036029513060165
- Chen, S. Y., Chu, M. S. (2014). A new process for the recovery of iron, vanadium, and titanium from vanadium titanomagnetite. Journal of the Southern African Institute of Mining and Metallurgy, 114 (6), 481–488.
- Zhao, L., Wang, L., Chen, D., Zhao, H., Liu, Y., Qi, T. (2015). Behaviors of vanadium and chromium in coal-based direct reduction of high-chromium vanadium-bearing titanomagnetite concentrates followed by magnetic separation. Transactions of Nonferrous Metals Society of China, 25 (4), 1325–1333. doi: 10.1016/s1003-6326(15)63731-1
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Copyright (c) 2018 Stanislav Hryhoriev, Artem Petryshchev, Karina Belokon’, Kristina Krupey, Mykhail Yamshinskij, Grigoriy Fedorov, Dmytro Stepanov, Andrii Semenchuk, Elena Matukhno, Alexander Savvin
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