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Investigations of Dual Plug Argon Blowing for Efficient Mixing at Ladle Furnace Station

Warzecha Marek, Hutny A., Warzecha P., Kutyła Z., Merder T.

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 2

561--572

EN

The article presents the results of model research concerning the change of technology of argon blowing into liquid steel at the ladle furnace, using the dual plug system. The results of numerical simulations were verified with experimental data carried out on the water model device. The verified model was used to perform numerical simulations to predict the impact of using a new gas injection technology - with different flow rates - on the time to achieve the assumed degree of metal chemical homogenization after alloy addition. Simulation results show that argon blowing metal bath in dual plug mode can effectively reduce mixing time compared to conventional technology with the same gas flow rates. Generally, the use of the dual plug system is beneficial for reducing the bath mixing time, however, the assumed optimal proportion of gas blown through individual plug should be followed. Finally, numerical predictions were used to perform experimental melt under industrial conditions. Industrial verification has clearly confirmed the validity of numerical modeling and showed that also in industrial conditions, a shorter time of chemical homogenization was obtained for the dual plug system.

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Application of oxalic acid as an efficient leaching agent of aluminum from industrial waste

Pospiech Beata, Warzecha Marek

Physicochemical Problems of Mineral Processing

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2020

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Vol. 56, iss. 2

264--270

EN

The leaching with acids is one of many methods used for recovery of valuable components from industrial wastes. The processing and neutralization of this type of waste is very difficult due to toxic properties. This work shows the results of aluminum leaching from industrial black dross with oxalic acid depending on temperature, acid concentration, effect of liquid to solid ratio (L/S) and time process. The oxalic acid has not been used so far for processing of aluminum black dross. The main purpose of this work was to determine the optimal conditions of this process. The results show that the maximum leaching efficiency of aluminum (75.2 %) was obtained with a liquid to solid ratio of 20:1 using 0.5 mol·dm-3 oxalic acid at 75 °C for 3 h.

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Badania filtracji ciekłej stali przez wielootworowe filtry ceramiczne w zależności od powierzchni kontaktu ciekła stal-filtr

Bogdał Agnieszka, Walaszczyk Klaudia, Felis Piotr, Superniak Adrian, Warzecha Marek

Hutnik, Wiadomości Hutnicze

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2020

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Vol. 87, nr 9

221--224

PL

W pracy przedstawiono wyniki badań filtracji ciekłej stali przez wielootworowe filtry ceramiczne. Przedmiotem badań była stal wysokowęglowa z gatunku C70D. Proces przeprowadzono z zastosowaniem filtrów o różnej wysokości, a zarazem o różnej powierzchni filtracji, w układach filtru pojedynczego oraz podwójnego i potrójnego. Przeprowadzone badania miały na celu zbadanie procesu filtracji stali poprzez wyznaczenie ilości wtrąceń niemetalicznych i ich udziałów powierzchniowych przed i po procesie filtracji. Kolejnym etapem badań było określenie skuteczności filtracji względem ilości wtrąceń niemetalicznych i udziałów powierzchniowych.

EN

The paper presents the results of research on filtration process of high-carbon steel (grade C70D) through multi-hole ceramic filters. The process was carried out using filters with different highs - single filter, double and triple filter system. The research was aimed at determining the amount of nonmetallic inclusions and their surface shares before and after the filtration process. The next stage of the study was to determine the filtration efficiency relative to the amount of non-metallic inclusions and surface shares.