Atmospheric leaching of EAF dust with diluted sulphuric acid

Havlík, Tomáš; Turzakova, Martina; Stopić, Srečko; Friedrich, Bernd

doi:10.1016/j.hydromet.2004.10.008

Cited by 141 publications

(80 citation statements)

References 3 publications

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“…Many processes have been or are being developed worldwide to recover the values from the dust or sludge or render them nonhazardous through stabilization or vitrification. 3,4) These can be pyrometallurgical, 5,6) Hydrometallurgical, [7][8][9][10][11][12][13][14][15][16][17] or a hydration of both. 18) However, finding a cost-effective and environmental-friendly process remains the major challenge.…”

Section: Introductionmentioning

confidence: 99%

Removal Behavior of Zn, Pb, K and Na from Cold Bonded Briquettes of Metallurgical Dust in Simulated RHF

Cui

Zhang

et al. 2009

ISIJ Int.

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Removal behavior of Zn, Pb, K and Na from cold bonded briquettes made by mixing four typical metallurgical wastes, as blast furnace dust, converter dust, electric arc furnace dust and converter sludge with proper proportions, in a simulated RHF (Rotary Hearth Furnace) were investigated in this paper. Effects of temperature and C/O molar ratio on metallization rate of iron oxides, and effect of temperature on removal rate of elements Zn, Pb, K and Na were checked respectively. The results show that when reduction temperature, C/O molar ratio, reduction time are 1 300°C, 1 and 15 min respectively, removal rates of Zn, Pb, K and Na are 97.1 %, 99.4 %, 94.5 % and 89.6 % respectively, at the same time the metallization rate is 80.6 %, which can meet demands of the blast furnace. X-ray mapping analysis via scanning electron micrograph (SEM) for Zn, Pb, K and Na in the cold bonded briquettes at different reduction time and different selected areas tells that Zn, Pb, K and Na located in edge of the briquettes remove faster than those located in the center of briquettes. The dust arrested in the reduction process, called as secondary dust, is proved to be mixture of mainly Zn, ZnO, KCl and NaCl by X-ray diffraction (XRD) analysis and SEM EDS (energy-dispersive spectrometry), and contents of Zn and KCl are obtained as over 60 % and nearly 20 % respectively, while Pb is probably in an insufficient amount to be detected. Water leaching tests arrive at a conclusion that primary separation of Zn and Pb from K and Na is obtained as expected, meanwhile content of element Zn increases from 57.9 % in the initial secondary dust to 73.6 % as ZnO in the leaching residual.

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Section: Introductionmentioning

confidence: 99%

Removal Behavior of Zn, Pb, K and Na from Cold Bonded Briquettes of Metallurgical Dust in Simulated RHF

Cui

Zhang

et al. 2009

ISIJ Int.

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“…Due to the industrial importance, several techniques have been developed or proposed as the intermediate treatment process based on the hydro-metallurgical process, 1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17] carbothermic reduction, 18) iron-reduction distillation process of zinc oxide in the dust, 19,20) chlorination of heavy metals with PVC 21) and so on. In addition, fundamental studies on the characterization of the dust components, 22) behavior of halogens during the carbothermic reduction, 23) thermodynamic simulation on the selective carbothermic reduction of dust components, 24) reutilization of the dust as a catalyst of waste water treatment, 25) suppression of dust generation in EAF operation 26) have also been reported.…”

Section: Introductionmentioning

confidence: 99%

New EAF Dust Treatment Process with the Aid of Strong Magnetic Field

et al. 2008

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A new EAF dust treatment process named as "Lime Addition and Magnetic Separation Process (LAMS Process)" has been proposed to recover zinc oxide from the dust and to use solid residue as a flux for steel refining. The LAMS Process consists of the reaction of EAF dust with CaO followed by the adequate crushing and high gradient magnetic separation. The basic principle of this process has been established by revealing the phase equilibria in the CaO-Fe 2 O 3 -ZnO system where Ca 2 Fe 2 O 5 can be in equilibrium with pure ZnO rather than ZnFe 2 O 4 , which is the major component of EAF dust, at higher CaO region. The conversion of zinc ferrite in EAF dust to ZnO and Ca 2 Fe 2 O 5 has been experimentally demonstrated by heating the dust with double molar amount of CaO at 1 173 and 1 373 K. It has also been demonstrated that the formed ZnO and Ca 2 Fe 2 O 5 can be separated by the strong magnetic field. Therefore, it may be possible to recover ZnO from EAF dust without the carbothermic reduction like Waelz process.

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“…A porção não-magnética foi lixiviada em ácido sulfúrico 1 mol L -1 por 24 horas à temperatura ambiente. O ácido sulfúrico tem sido usado na lixiviação por diversos pesquisadores (Havlik et al, 2005;Padilla et al, 2005) e, apesar de ele não ser um áci-do tão forte quanto o ácido nítrico e o ácido clorídrico (Copur, 2002), é preferível usá-lo por ser mais barato, por ser ambientalmente amigável e causar menores problemas de corrosão. Também é aconselhável usá-lo como eletrólito na eletro-obtenção (Biswas et al, 1980).…”

Section: Pré-tratamento Das Pilhas E De Bateriasunclassified

Estudo eletroquímico da recuperação de metais de pilhas e de baterias descartadas após o uso

Provazi¹,

Espinosa

Tenório

2012

Rem: Rev. Esc. Minas

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ResumoO objetivo da pesquisa é recuperar os principais metais presentes em um lote com uma mistura de diversos tipos de pilhas e de baterias descartadas após o uso, lote obtido em um posto de coleta. Para esse estudo, o resíduo das pilhas e das baterias foi moído, reduzido em forno elétrico, submetido à separação magnética e lixiviado. A composição química, após a lixiviação, foi reproduzida em uma solução sintética, que foi submetida à extração por solventes e reextração sendo que as soluções obtidas, após as reextrações, foram utilizadas como eletrólitos. Manganês, cobre, cobalto e níquel são recuperados na forma metálica após um tratamento que inclui as etapas pirometalúrgica, hidrometalúrgica e eletroquímica. Estudos anteriores definiram os parâmetros das etapas pirometalúrgica, lixiviação e extração por solventes que proporcionaram separação mais seletiva dos íons metálicos que se pretende recuperar. A contribuição do presente estudo é encontrar um processo que trate de todos os tipos de pilhas e de baterias juntos e recuperar seus metais mais importantes, evitando, assim, a etapa de separação prévia das baterias. Os filmes foram analisados quanto à sua espessura e composição. Palavras-chave:Reciclagem, pilhas e baterias, eletro-obtenção. Abstract The research aims to recover the major metals present in a lot

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Atmospheric leaching of EAF dust with diluted sulphuric acid

Cited by 141 publications

References 3 publications

Removal Behavior of Zn, Pb, K and Na from Cold Bonded Briquettes of Metallurgical Dust in Simulated RHF

Removal Behavior of Zn, Pb, K and Na from Cold Bonded Briquettes of Metallurgical Dust in Simulated RHF

New EAF Dust Treatment Process with the Aid of Strong Magnetic Field

Estudo eletroquímico da recuperação de metais de pilhas e de baterias descartadas após o uso

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