Eng
Ukr
Rus
Print
2018 №04 (05) DOI of Article
10.15407/sem2018.04.06
2018 №04 (01)

Electrometallurgy Today 2018 #04
SEM, 2018, #4, 70-74 pages
 
Innovative hydrovacuum technology of granulation of metal melts

Journal                    Sovremennaya Elektrometallurgiya
Publisher                 International Association «Welding»
ISSN                      2415-8445 (print)
Issue                       № 4, 2018 (November)
Pages                      70-74
 
 
Authors
G. V. Janndieri1, I. F. Gorbenko3, D. V. Sakhvadze2,3, T. I. Tsirekidze3
1Metallurgical Engineering and Consulting LTD, Tbilisi, Georgia. E-mail: Gigo.jandieri@yahoo.com
2State Scientific-Technical Center: «Delta» Georgia.
3G-Metall LLC, Georgia.

The efficiency of granulation of molten processed ferroalloys under conditions of semi-industrial testing of new method and equipment for hydrovacuum dispersion of melts was considered. The novelty of the presented development is the fact that the working fluid (high-pressure technical water) is running in closed channels around the closed contour in end head of the installation in the zone of mating the main channel and a special tip, immersed into a molten alloy. Due to a sharp change in shape and diameter of the main channel a toroidal vortex is created which forms rarefaction at the tip outlet, thus suctioning the melt by vacuum. The vertical melt flow is subjected during passing through the toroidal vortex to tensile effects, as a result of which it is widened many times and separated into fine granules (flakes). The produced shots, mixed with water, are removed by the same water to the pulp sewage tank Presented are the scheme and appearance of the working installation, as well as main experimental data of the process under the conditions of granulation of high-silicon processed silicomanganese FeMnSi28. The graphical dependence of granules dispersion, process efficiency and consumption of circulating water on initial temperature of melt and diameter of vacuum channel of a suction tip, morphology of surfaces and structure of produced granules (approximately 2.5 mm) are given. A principal feasibility of producing spherical fine-dispersed (approximately 50 μm) powders suitable both for the precision ladle treatment of metal melts, and for the additive production is shown. Ref. 12, Fig. 5.
Key words: molten ferroalloys; granules; hydrovacuum; hydrodynamic dispersion; granules; powders
 
Received:                06.06.18
Published:               15.11.18
 
 
References
1. Ervin, J.F. (1939) Method of disintegrating metal into shotting. Pat. 2159433, US https://patents.google.com/patent/US2159433.
2. (2000) Encyclopaedia on metallurgy. Ed. by N.P. Lyakishev. Moscow, Intermet Engineering. https://metallurgicheskiy.academic.ru/2421 [in Russian].
3. (2017) NPAOP 27.35-1.01–09: Regulations of occupational safety in ferroalloy production. Pt 11: Granulation of ferroalloys. http://ohranatruda.in.ua/pages/481/ [in Russian].
4. Vesterberg, P., Beskow, K., Rick, C.-J. (2013) Granulation of ferroalloys — results from industrial operations and comparative study on fines generation. In: Proc. of the 13th Int. Ferroalloys Congress Infacon XIII (Almaty, Kazakhstan) 140–141.
5. Uvan Holding AB (2015) Granulation of molten material. Pat. WO 2015/034425 A1, Int. Cl. B22F 9/10, B22F 9/08.
6. Godetsky, E.V. (1974) Method of slag removal. USSR author's cert. 433214, C21C 5/52 [in Russian].
7. Sakhvadze, D., Jandieri, G., Tsirekidze, T., Gorbenko, I. (2015) Device for producing metallic powder from melt. Pat. GE P20156384 (B), Int. Cl. B22F9/08.
8. Sakhvadze, D., Jandieri, G., Gorbenko, I. et al. (2015) Device of molten granulation for obtaining the powder materials for SHS. In: Proc. of 13th Int. Symp. on SHS (Antalya, Turkey), 140–141.
9. Sakhvadze, D., Gorbenko, I., Jandieri, G., Tsirekidze, T. (2015) Obtaining metal powders in hydrovacuum melt suction plant. In: Proc. of Int. Sci.-Techn. Conf. on Innovative Technologies in Metallurgy and Materials Science (Georgia, Tbilisi), 38–44.
10. Sakhvadze, D., Jandieri, G., Bolqvadze, A. et al. (2017) Morphological and metallographic analysis of metallic powders produced by the method of hydro-vacuum dispersion of melts. In: Proc. of 14th Int. Symp. on SHS (Tbilisi, Georgia), 218–221.
11. Kablov, E.N., Ospennikova, O.G., Bakradze, M.M., Vostrikov, A.V. et al. (2017) Granulated super high-temperature nickel alloy and product manufactured from it. Pat. 2623540C1, Russia, 217.015.D91F [in Russian].
12. (2017) Micropowders for AM-technologies. SRI TP. http://progress.institute/am-texnologij/ [in Russian].
>