Title:
METHOD OF RECOVERING METALS FROM METALLURGICAL WASTE
Document Type and Number:
WIPO Patent Application WO/2024/010474
Kind Code:
A1
Abstract:
A method for the recovery of metals from metallurgical waste, especially zinc and iron from dusts is characterized in that the zinc-bearing dusts are granulated with the addition of a reducing agent (coal dust, carboniser, fly ash) in an amount of 7 - 25 % by weight of the metal-bearing charge and material thus prepared is directed to an electric arc-resistive furnace where it is melted at a temperature of 1350 - 1600ºC, where the processes of reduction of zinc and iron oxides take place simultaneously, after which the zinc in gaseous form is stripped and oxidised in the air stream, followed by a two-stage dedusting of the gaseous phase, where a coarser dust fractions are collected in the pre-dusting chamber and returned to the process, further in the dedusting system, the gases are cooled to below 200°C and directed to bag filters for the capture and recovery of zinc oxide in the form of fine dust, while an iron alloy and a waste slag are drained from it, after which the ferrous alloy is directed to an induction or arc furnace, where its chemical composition is modified by removing excess of carbon, sulphur and phosphorus and by adding a steel scrap or an alloying additives to a commercial alloys.
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Inventors:
HUTNY ARTUR (PL)
WARZECHA MAREK (PL)
STRADOMSKI GRZEGORZ (PL)
MAŁECKI STANISŁAW (PL)
GARGUL KRZYSZTOF (PL)
JAROSZ PIOTR (PL)
DOBRZYŃSKI MICHAŁ (PL)
WARZECHA MAREK (PL)
STRADOMSKI GRZEGORZ (PL)
MAŁECKI STANISŁAW (PL)
GARGUL KRZYSZTOF (PL)
JAROSZ PIOTR (PL)
DOBRZYŃSKI MICHAŁ (PL)
Application Number:
PCT/PL2023/050050
Publication Date:
January 11, 2024
Filing Date:
July 05, 2023
Export Citation:
Assignee:
P P H U STILMAR MICHAL DOBRZYNSKI (PL)
International Classes:
C22B7/02; C21B11/10; C21C5/52; C22B1/245; C22B5/10; C22B19/30; C22B19/34
Domestic Patent References:
| WO2010023691A1 | 2010-03-04 |
Foreign References:
| US6102982A | 2000-08-15 | |||
| US6372011B1 | 2002-04-16 | |||
| AU2016253551A1 | 2018-05-17 | |||
| GB2578275A | 2020-05-06 | |||
| PL288418A1 | 1991-09-23 | |||
| PL174046B1 | 1998-06-30 | |||
| PL314353A1 | 1997-11-24 | |||
| PL225632A1 | 1982-01-18 |
Other References:
MAIA THALES A. C. ET AL: "Survey on the electric arc furnace and ladle furnace electric system", IRONMAKING & STEELMAKING: PROCESSES, PRODUCTS AND APPLICATIONS, vol. 49, no. 10, 26 November 2022 (2022-11-26), United Kingdom, pages 976 - 994, XP093093914, ISSN: 0301-9233, DOI: 10.1080/03019233.2022.2128550
Attorney, Agent or Firm:
DAMIAN KUBERA YOSHI INTELLECTUAL PROPERTY SP Z O.O. (PL)
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