Wyniki wyszukiwania - BazTech

1

Alkaline Leaching of Low Zinc Content Iron-Bearing Sludges

Gargul K., Jarosz P., Małecki S.

Archives of Metallurgy and Materials

|

2016

|

Vol. 61, iss. 1

43--50

EN

Various types of waste materials containing zinc (e.g. dusts and sludges from gas dedusting process) are obtained in steel industry. The contents of Zn in these materials may vary considerably. Even a low concentration of zinc in recirculated products precludes their recycling in ferrous metallurgy aggregates. Long storage of this type of material can lead to contamination of soil and water by zinc compounds which can be leached out by acid rain, for example. This paper focuses on research involving alkaline leaching tests of low zinc content iron-bearing materials. These tests were preceded by the analysis of the elemental, phase and grain size composition, and analysis of the thermodynamic conditions of the leaching process. The main aim of research was to decrease the content of the zinc in the sludge to the level where it is suitable as an iron-bearing material for iron production (~1% Zn). Leaching at elevated temperatures (368 K, 60 min) has led to a decrease in the zinc content in the sludge of about 66%. The research revealed that long hour leaching (298 K, 100 hours) carried out at ambient temperatures caused a reduction in zinc content by 60% to the value of 1.15-1.2% Zn.

2

Removal of zinc from dusts and sludges from basic oxygen furnaces in the process of ammoniacal leaching

Gargul K., Boryczko B.

Archives of Civil and Mechanical Engineering

|

2015

|

Vol. 15, no. 1

179--187

EN

More than 20 kg of dust and sludge per 1 ton of produced metal are generated in the basic oxygen furnaces used in steel metallurgy. In this type of waste there may be many non-ferrous metals, including also zinc. The content of this metal in dusts ranges from 1 to 6%. After lowering the zinc content to a level of about 1%, such type of waste may become a full-fledged iron-bearing material used in ferrous metallurgy. There is also a possibility to recover and manage the zinc removed from waste materials. Recycling of these materials also reduces the risk to the natural environment, resulting from e.g. the transition of metal compounds contained in stored waste materials into the groundwater and soil. The article presents the results of ammonia leaching of wastes from basic oxygen furnaces where the zinc content is 2.82%. Ammonia leaching allows the turn zinc into the liquid phase with minimal loss of iron in this process. The examinations apply three compounds of ammonia (NH4Cl, (NH4)2CO3 and NH4OH) to analyze the efficiency of the leaching process at different times, temperatures, concentrations of applied compounds and ratios of liquid phase to the solid phase.

3

Zastosowanie roztworów KOH do ługowania szlamów i pyłów stalowniczych

Gargul K., Palimąka P., Boryczko B.

Hutnik, Wiadomości Hutnicze

|

2013

|

Vol. 80, nr 11

735--738

PL

W pracy przedstawiono wyniki badań ługowania szlamów i pyłów stalowniczych o niskiej zawartości cynku. Czynnikiem ługującym był roztwór KOH, próby przeprowadzono dla różnych wariantów zmiennych parametrów (czas, temperatura, stężenie KOH, stosunek faza ciekła/faza stała). Przeprowadzone badania wskazują na możliwość obniżenia zawartości Zn w ługowanym materiale do poziomu około 1% i zastosowania go jako komponentu wsadu do produkcji żelaza i stali. Elektroliza roztworu po ługowaniu prowadzi do odzysku cynku i regeneracji roztworu ługującego.

EN

This paper presents the results of leaching steelmaking sludge and dust with a low zinc content. Leachant was KOH solution, tests were performed for various combinations of variables (time, temperature, KOH concentration, the ratio of the liquid phase/solid phase). Research has indicated the possibility of reducing the content of Zn in leaching material to approximately 1% and use it as a feed component for the production of iron and steel. Electrolysis of the leach solution leads to zinc recovery and regeneration of the leaching solution.