Investigation of carboxylic acids and non-aqueous solvents for the selective leaching of zinc from blast furnace dust slurry

Steer, Julian Mark; Griffiths, Anthony John

doi:10.1016/j.hydromet.2013.08.011

Cited by 87 publications

(41 citation statements)

References 19 publications

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“…2,4,5,7,9) In the case of upgrading using hydrocyclones, the zinc content of the untreated sludge in the present study is less than 5) or in the range of 4) the zinc content of the dezinced fraction published previously. This highlights the aim of dezincing: to introduce a bleed of zinc from the furnace, regardless of how low the starting zinc content is, rather than reaching a generalized zinc content of the dezinced fraction to be recycled.…”

Section: Characterizationcontrasting

confidence: 46%

“…2,9) In both of these cases the conditions of the leaching have not justified the use of the acid, whether the conditions are too mild 2) or leaching time is unreasonably prolonged, at least for the purpose of zinc removal, resulting in a high leaching yield of iron. 9) However, studies show that the use of sulfuric acid is superior to other mineral acids such as hydrochloric acid and nitric acid when it comes to removing as much zinc as possible from BF sludge. 7,9) It has also been demonstrated that sulfuric acid is superior to hydrochloric acid and nitric acid in the leaching of zinc in synthetic zinc ferrite.…”

Section: Hot Sulfuric Acid Leachingmentioning

confidence: 99%

“…9) However, studies show that the use of sulfuric acid is superior to other mineral acids such as hydrochloric acid and nitric acid when it comes to removing as much zinc as possible from BF sludge. 7,9) It has also been demonstrated that sulfuric acid is superior to hydrochloric acid and nitric acid in the leaching of zinc in synthetic zinc ferrite. 18) In the present study, the hot acid leaching using sulfuric acid at pH 1 resulted in a leaching yield of 95% of the zinc, leaving a residue with a zinc content of 0.025%.…”

Section: Hot Sulfuric Acid Leachingmentioning

confidence: 99%

“…3,5) Furthermore, hydrocycloning in a one stage, [2][3][4][5] two stage 3,4) and a three stage 6) process has been reported. Also, zinc has been successfully leached from BF sludge using sulfuric acid, 7) hydrochloric acid 2,8) and a mix of prop-2-enoic acid and methylbenzene 9) with varying results for the unwanted dissolution of iron. Other dezincing methods that have been reported include flotation 2) and microwave heating.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Upgrading of a Low Zinc-Containing and Fine Blast Furnace Sludge – A Multi-Objective Analysis

et al. 2017

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Ore-based steelmaking generates a variety of residues including dusts, sludges and slags. Recycling of these residues within the process or via other applications is essential for sustainable production from both environmental and economic aspects. In blast furnace (BF) ironmaking, there are generally two residues leaving the gas cleaning equipment; namely, BF dust and BF sludge. Traditionally, the dust is recycled via the sinter or, in the case of pellet based BF, via cold bonded agglomerates and injection. As the main output of zinc from the BF is the top gas, the sludge has to be dezinced prior to recycling to prevent accumulation of zinc in the furnace. Although dezincing of BF sludge has been successfully accomplished using e.g., hydrocycloning, the studied sludges are generally coarse sized and high in zinc. Furthermore, information is lacking regarding the efficiency of separation of different hydrocyclone setups. In the present work, hydrocycloning of a fine sludge, with low zinc content, generated by a pellet based BF has been studied. The gas cleaning equipment used to produce the sludge was running a primary aerocyclone and a scrubber. A characterization of the sludge has been conducted together with an evaluation of the separation efficiency of the hydrocyclone in order to assess the hydrocyclone performance and limitations. Furthermore, the dezincing using the hydrocyclone has been compared to that of sulfuric acid leaching. The results suggest that 51 to 93% of the sludge can be recycled depending on the demand on zinc removal and the chosen dezincing route.

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Section: Characterizationcontrasting

confidence: 46%

Section: Hot Sulfuric Acid Leachingmentioning

confidence: 99%

Section: Hot Sulfuric Acid Leachingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and Upgrading of a Low Zinc-Containing and Fine Blast Furnace Sludge – A Multi-Objective Analysis

et al. 2017

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“…This yield can be reasonably linked to the fraction of zinc present in the phosphors as ZnO, which is soluble in carboxylic acids. 37 Since sample 1 showed the lowest ZnS concentration (0.5 wt%), it was selected for further investigation. A sample of 10 g was leached with 10 mol L À1 acetic acid under the optimised conditions (T ¼ 25 C, t ¼ 2 h, L/S ¼ 10 mL g À1 ).…”

Section: Leachingmentioning

confidence: 99%

Integrated process for the recovery of yttrium and europium from CRT phosphor waste

et al. 2019

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Development of stabilization measures aimed at removing zinc with smelting products and accumulating titanium in the hearth of a blast furnace

Semenov,

Horupakha,

Vashchenko

et al. 2024

Engineering Reports

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This paper presents the results of the development of stabilization measures aimed at the removal of zinc with the products of melting and accumulation of titanium in the hearth of a blast furnace. The relevance of the development and use in practice of such measures is due to the unstable fuel and raw materials conditions for the production of cast iron, when their stabilization is a complex and difficult task, as well as the need to extend the campaign of blast furnaces during the overhaul period. The negative effect of zinc oxides on the condition of the blast furnace shaft lining, accompanied by slab formation, and the overconsumption of specific coke consumption, which occurs when zinc circulates in the volume of the blast furnace, require measures to remove zinc from the smelting products. The article proposes such measures, which consist of flushing according to the proposed schedule during the operation of the blast furnace at planned blowing parameters and with the provision of the necessary thermal reserve. In order to lengthen the campaign of a blast furnace, one of the most common methods for protecting the hearth lining is the periodic introduction of titanium‐containing materials into the charge of blast furnaces. The entry of titanium oxides into the furnace, as a rule, is ensured by the use of concentrate or specially prepared ilmenite briquettes with a high titanium content as part of the sinter charge, which can be introduced directly into the composition of the blast furnace charge. The article analyzes the experience of using titanium‐containing materials as part of a blast furnace charge and formulates measures to intensify skull formation in the hearth.

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Investigation of carboxylic acids and non-aqueous solvents for the selective leaching of zinc from blast furnace dust slurry

Cited by 87 publications

References 19 publications

Characterization and Upgrading of a Low Zinc-Containing and Fine Blast Furnace Sludge – A Multi-Objective Analysis

Characterization and Upgrading of a Low Zinc-Containing and Fine Blast Furnace Sludge – A Multi-Objective Analysis

Integrated process for the recovery of yttrium and europium from CRT phosphor waste

Development of stabilization measures aimed at removing zinc with smelting products and accumulating titanium in the hearth of a blast furnace

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