Caustic Roasting and Leaching of Electric Arc Furnace Dust ...
Electric arc furnace (EAF) dust is produced when iron and steel scrap is remelted in an electric arc furnace. There are still significant problems associated with the pyrometallurgical and/or hydrometallurgical processes for the treatment of this dust. In the present research, the dust was roasted with caustic soda at low temperatures.
Lead and zinc selective precipitation from leach electric ...
2.2 Preparation of Alkaline Solution from EAF Dust Treatment. EAF dust samples were treated using an integrated process that combines three steps: EAF dust hydrolysis, fusion with caustic soda and then leaching, as described by Youcai and Stanforth [8] and Lenz et al. [13].
US6221124B1 - Fluidized bed treatment of EAF dust - Google ...
The invention concerns a method of treating electric arc furnace (EAF) dust. In the method the dust is preheated and decontaminated under conditions which oxidize the magnetite content of the dust to hematite. Thereafter the preheated and decontaminated dust is introduced into a fluidized bed reactor in which hematite is reduced, by means of a hot reducing gas generated by reforming natural ...
Effect of Acid Treatment on the Recovery of Valuable ...
Caustic soda leach of electric arc furnace dust. Turkish J Eng Environ Sci 1999; 23(3): 199-207. [32] Jezierski J, Janerka K. Selected aspects of metallurgical and foundry furnace dust …
(PDF) Caustic Soda Leach of Electric Arc Furnace Dust
In this study, caustic soda leach experiments were conducted with an EAF dust sample containing 23 % Zn, 5 % Pb and 30 % Fe obtained from by a plant located in Alia ga/_Izmir. Optimum leach ...
Hydrometallurgical Treatment of EAF Dust by Direct ...
The present paper presents a part of the research efforts of the laboratory of Metallurgy, National Technical University of Athens, Greece, aiming at developing a purely hydrometallurgical method, able to treat the zincferous dust, generated during the production of steel from scraps in Electric Arc Furnace (EAF), efficiently and economically and especially so for annual capacities lower than ...
RECOVERY OF ZINC FROM FERRITE ELECTRIC FURNACE
Based on the unique properties of caustic soda (Le. low melting point), the research involved a low temperature caustic roasting process for both the synthetic zinc femte and the zinc femte in the EAF dust followed by dilute caustic leaching of the roasted …
Hydrothermal treatment of electric arc furnace dust ...
1. Introduction. The treatment and recovery of electric arc furnace dust (EAFD) has been intensively studied, triggering the development of many recycling and recovery processes during the past decades,,,, .Most of the pyrometallurgical processes focus on the recovery of zinc oxide and direct-reduced iron, using the carbon-thermal reduction process.
ALKALINE LEACHING OF ZINC FROM STAINLESS STEEL …
dust back into furnaces. In this paper two different stainless steel electric arc furnace dusts (EAF1 and EAF2) from Outokumpu Stainless (Tornio, Finland), were leached using NaOH solutions. The purpose was to selectively leach out zinc from the dusts and to find factors that affected most dissolution of zinc.
US20080011123A1 - Alkaline electro-hydrometallurgical ...
An electro-hydrometallurgical process that extracts zinc from electric furnace dust (EAF dust) to produce zinc of high purity and fine particle size, including leaching EAF dust with an alkaline solution to form a zincates solution, separating the liquid and gangue in the zincate solution; inertizing the gangue, purifying the liquid by cementation and separating the liquid from precipitated ...
Thermodynamic and Kinetic Investigations of Leaching ...
[4] J. Frenay., J. Hissel, S. Ferlay, Recovery of lead and zinc from electric steel-making furnace dusts by the Cebedeau process in Recycle and Secondary Recovery of Metals, TMS, 1985, 195-202. [5] H. Mordogan, T. Cicek, A. Isik, Caustic Soda Leach of Electric Arc Furnace Dust, Tr.J. of Engineering and Environmental Science, 23 (1999), 199-207.
Caustic roasting and leaching of electric arc furnace dust ...
Abstract. Electric arc furnace (EAF) dust is produced when iron and steel scrap is remelted in an electric arc furnace. There are still significant problems associated with the pyrometallurgical and/or hydrometallurgical processes for the treatment of this dust. In the present research, the dust was roasted with caustic soda at low temperatures.
Caustic soda leach of electric arc furnace dust | AVESİS
Caustic soda leach of electric arc furna... Caustic soda leach of electric arc furnace dust Atıf İçin Kopyala MORDOĞAN H., Çïçek T., IŞIK A. T. Turkish Journal of Engineering and Environmental Sciences, cilt.23, sa.3, ss.199-207, 1999 (Diğer Kurumların Hakemli Dergileri) Yayın Türü: Makale / …
SCIENCE: Leaching properties of electric arc furnace dust ...
Electric arc furnace (EAF) dust is a major by-product hazardous waste generated by the secondary steelmaking industry. It is a complex, fine-grained, high-density material. The composition of EAF dust is directly associated with the chemistry of the metallic charges used in process.
Integrated hydrometallurgical process for production of ...
In this study, a novel and integrated hydrometallurgical process for the production of zinc powder from electric arc furnace (EAF) dust in alkaline medium is reported. The dust is firstly hydrolysed in water, and then fused in caustic soda at 350°C for 1 h, followed by leaching in alkaline solution in which both zinc and lead are effectively ...
US6258245B1 - Copper leach process aids - Google Patents
A method for enhancing the operation of an acid solvent extraction and electrowinning operation by inhibiting acidic aerosol formation, allowing increased acid concentration and allowing higher operating temperature is disclosed wherein an anti formulation stable at a solution pH of about 1 to 2 is added. A preferred anti formulation comprises a glycol ester and an alkyl phenol ...
Recycling EAF dust leaching residue to the furnace: A ...
Simulation programs have been devel oped to study the effect of recycling the electric arc furnace dust leaching residues to the furnace. Residues from sulfuric acid and sodium hydroxide leaching have been tested. Results enable the furnace-leaching response to be defined in accord with the recycling rate and conditions for zero stabilization to be determined. Either of the two alternative ...
Alkaline leaching of iron and steelmaking dust
Steel production generates significant quantities of dust and sludge in blast furnaces (BF),basic oxygen furnaces (BOF), and electric arc furnaces (EAF). These dusts contain toxicelements, such as heavy metals, and are thus classified as harmful waste making the disposalof them expensive.
Extraction of zinc from electric arc furnace dust by ...
Extraction of zinc from electric arc furnace dust by alkaline leaching followed by fusion of the leaching residue with caustic soda April 2004 Chinese Journal of Chemical Engineering 12(2):174-178
Electric arc furnace Research Papers - Academia.edu
In this study, a novel and integrated hydrometallurgical process for the production of zinc powder from electric arc furnace (EAF) dust in alkaline medium is reported. The dust is firstly hydrolysed in water, and then fused in caustic soda at 350 degrees C for 1h, followed by leaching in alkaline solution in which both zinc and lead are ...
Alkaline leaching of iron and steelmaking dust
processes, such as roasting, can be used prior to leaching. By roasting with caustic soda prior to alkaline leaching zinc ferrites can be decomposed and leaching of zinc could be improved. Keywords BF dust, BOF dust, EAF dust, NaOH leaching, zinc recovery ISBN (printed) 978-952-60-4462-0 ISBN (pdf) 978-952-60-4463-7
Key Words: Zinc, dust, leach, electric arc furnace ...
Therefore, the recycling of Turkish EAF dust could contribute greatly to the economy. In this study, caustic soda leach experiments were conducted with an EAF dust sample containing 23 % Zn, 5 % Pb and 30 % Fe obtained from by a plant located in Aliaga/_Izmir. Optimum leach …
The kinetics of zinc silicate leaching in sodium hydroxide ...
The leaching in alkaline media (ammonia, caustic soda, ... Investigation of kinetics of zinc leaching from electric arc furnace dust by sodium hydroxide. Materials Chemistry and Physics, 77 (2) (2003), pp. 531-535. Article Download PDF View Record in …
US5942198A - Beneficiation of furnace dust for the ...
The beneficiation of an electric arc furnace (EAF) dust waste stream comprising zinc compounds by collecting and combining dust from two or more EAF batches with coal fines to form briquettes, adding the briquettes to a final EAF batch with the charge, and collecting the dust from the final EAF batch, so that the zinc in the beneficiated dust is of a greater proportion than in a typical batch ...
Application of alkaline solid residue of electric arc ...
Academia.edu is a platform for academics to share research papers.
Effect of NaOH concentration on zinc extraction (800 r/min ...
The Effectiveness of Zn Leaching from EAFD Using Caustic Soda. Article. Full-text available. Jan 2018; ... Cr and Mn during leaching of Electric Arc Furnace (EAF) dust in acid medium has been ...
Study of Zinc Leaching of EAF Flue Dust Using Sodium …
before and after leaching. The optimum alkali concentration for selective leaching of zinc was found to be 4 M with a zinc recovery of 90 %. Keywords: EAF dust, Leaching, Sustainable environment, Zinc recovery.-----Introduction In steel-making plant, the production of Electric Arc Furnace (EAF) dust is 1–2 % of total steel
Hydrothermal treatment of electric arc furnace dust ...
D.K. Xia, C.A. Pickles, Caustic roasting and leaching of electric arc furnace dust (1999) 00014–2.
The Effectiveness of Zn Leaching from EAFD Using Caustic …
12%Electric arc furnace dust (EAFD) is a toxic waste which is mainly rich in iron oxide, zinc, and lead. Hydrometallurgical extraction of zinc from Jordanian EAFD in alkaline medium was investigated; NaOH, NaHCO 3, and Na 2 CO 3 were used as leaching agents. The pH values for the prepared solutions were 8.3, 8.2, and 12.55 for NaHCO 3, Na 2 CO 3, and NaOH, …
Alkaline leaching of iron and steelmaking dust
The dusts are very fine (usually < 0.01 mm) and have tendency to agglomerate. Metal extraction from the dusts is difficult due to their complex composition and finding asuitable process is complicated as each dust is unique. The advantage of caustic soda leachingis its selectiveness in leaching zinc compared to iron compounds.
