Recovering Zn, Pb, Cd and Fe from electric furnace dust

Wang, J. C.; Hepworth, M.T.; Reid, Ken

doi:10.1007/bf03220923

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…According to the International Iron and Steel Institute (IISI) [3], world production of crude steel by electric way was about 286 millions of ton in the year 2000. In a typical electric-arc furnace (EAF) operation, approximately 1-2% of the charge is converted into dust [4]. Thus, world production of EAF dust is about 2.9-5.7 millions of ton per year.…”

Section: Introductionmentioning

confidence: 99%

Lead and zinc selective precipitation from leach electric arc furnace dust solutions

Lenz

Martins

2007

Matéria (Rio J.)

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Electric-arc furnace (EAF) dust is considered a hazardous industrial waste. In this work, chemical and mineralogical investigations of EAF dust from Siderúrgica Rio-Grandense (RS, Brazil) were performed. The elements aluminum, calcium, lead, cadmium, chromium, magnesium, manganese, nickel, potassium, silicon, sodium, tin, iron, zinc, sulphur, oxygen, and carbon were found in EAF dust. The concentration of zinc and iron showed an average value of approximately 20% (weight basis) and these elements are mainly present as ZnO.Fe 2 O 3 (zinc ferrite) and ZnO (zincite) mineralogical phases. Also, EAF dusts were submitted to an integrated hydrometallurgical process composed by a hydrolyzed step, followed by a fusion step and a strong alkaline leaching. A subsequent chemical precipitation was carried out in order to promote selective separation of zinc and lead from the leach solution. Sodium sulphide was successfully employed as precipitant agent. When the weight ratio of sodium sulphide to lead was around 2.0, lead could be selectively extracted from leach solution. After lead precipitation without zinc concomitant loss, a weight ratio of sodium sulphide to zinc of around 3.0 was used to precipitate all zinc. Thus, EAF dust has a great potential to be used as a source of metals extraction due to its rich chemical composition and also for the viability of the proposed selective separation process.

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Section: Introductionmentioning

confidence: 99%

Lead and zinc selective precipitation from leach electric arc furnace dust solutions

Lenz

Martins

2007

Matéria (Rio J.)

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“…In a typical EAF operation, approximately 1-2% of the charge is converted to dust, which is collected in the baghouse. [1][2][3] Dusts generated during carbon steelmaking tend to be richer in zinc and lead, while EAF dusts from stainless steelmaking are relatively low in zinc and lead, but richer in alloying elements such as chromium and nickel. 4 EAF dust has been classified by various government regulatory agencies as a hazardous waste, because of the leachability of heavy metals such as lead, cadmium and chromium.…”

Section: Introductionmentioning

confidence: 99%

EAF and secondary dust characterisation

Mantovani¹,

Takano²,

Büchler³

2004

Ironmaking & Steelmaking

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The basic knowledge of the physical and chemical properties of the electric arc furnace (EAF) and secondary dust (SD) obtained by the characterisation provides important information on the potential problems that could be encountered during the processing of such materials. EAF dust consists mainly of very fine spherical particles. The most common phases in the EAF dust are solid solution of iron spinels generally enclosed into a matrix of calcium-iron silicate glass. Leaching tests show that as the Zn/Fe ratio increases, there is an increase in the zinc extraction, whereas the iron extraction decreases as the Zn/Fe ratio increases. It was possible to produce a SD containing 55 . 8% zinc by means of charging EAF primary dust-coal composite pellets into an induction furnace. SD consists of very fine particles presenting a mean particle size of 0 . 26 mm. In addition, SD contains significant levels of iron, chloride and fluoride. The iron content in the SD was identified as being iron droplets ejected from the bath caused by high intensity gas generation during the smelting of the EAF primary dust-coal composite pellets.

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“…[12] In 2018, the global steel production was 1807 million tons (MT), 520 MT of which were produced via the EAF route. [13] Per ton of liquid EAF steel [14][15][16] 10 to 25 kg of EAFD are typically generated (depending on scrap composition and furnace operation, [12,17] ) which sum to approximately a yearly EAFD generation of 5.2 to 13 MT. [18] Moreover, the EAF steel production is forecasted to increase up to 1000 MT in 2050, in which case the annual dust generation could increase up to 25 MT.…”

Section: Introductionmentioning

confidence: 99%

Carbothermic Reduction of Zinc Containing Industrial Wastes: A Kinetic Model

Leuchtenmueller

Legerer

Brandner

et al. 2021

Metall Mater Trans B

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Effective recycling of zinc-containing industrial wastes, most importantly electric arc furnace dust, is of tremendous importance for the circular economy of the steel and zinc industry. Herein, we propose a comprehensive kinetic model of the combined carbothermic and metallothermic reduction of zinc oxide in a metal bath process. Pyro-metallurgical, large-scale lab experiments of a carbon-saturated iron melt as reduction agent for a molten zinc oxide slag were performed to determine reaction constants and accurately predict mass transfer coefficients of the proposed kinetic model. An experimentally determined kinetic model demonstrates that various reactions run simultaneously during the reduction of zinc oxide and iron oxide. For the investigated slag composition, the temperature-dependent contribution of the metallothermic zinc oxide reduction was between 25 and 50 pct of the overall reaction mechanism. The mass transfer coefficient of the zinc oxide reduction quadrupled from 1400 °C to 1500 °C. The zinc recovery rate was > 99.9 pct in all experiments.

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Recovering Zn, Pb, Cd and Fe from electric furnace dust

Cited by 10 publications

References 5 publications

Lead and zinc selective precipitation from leach electric arc furnace dust solutions

Lead and zinc selective precipitation from leach electric arc furnace dust solutions

EAF and secondary dust characterisation

Carbothermic Reduction of Zinc Containing Industrial Wastes: A Kinetic Model

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