Characterization of blast furnace sludge and removal of zinc by microwave assisted extraction

Vereš, Ján; Lovás, Michal; Jakabský, Štefan; Šepelák, V.; Hredzák, Slavomír

doi:10.1016/j.hydromet.2012.09.008

Cited by 97 publications

(55 citation statements)

References 23 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the recovery of iron in the residue was 91%. These results are in line with results presented in the literature, 7) suggesting that, indeed, sulfuric acid is a good leaching agent for dezincing BF sludge while maintaining most of the iron in the residue.…”

Section: Hot Sulfuric Acid Leachingsupporting

confidence: 92%

“…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: 45%

“…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%

See 3 more Smart Citations

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Section: Hot Sulfuric Acid Leachingsupporting

confidence: 92%

Section: Characterizationcontrasting

confidence: 45%

Section: Hot Sulfuric Acid Leachingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2017

View full text Add to dashboard Cite

show abstract

“…), several alternative processes using mechanochemical, electrochemical and sonochemical treatments have been tested and reported, but they were focused mainly on primary sulfide minerals such as chalcopyrite and chalcocite. In particular, the mechanochemical process has advantages over the others, including no need for additional equipment and procedural simplicity, despite this method had some drawbacks such as agglomeration of fine particles and the relatively lower energy efficiency in the prolonged grinding [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Lee

Kim

et al. 2018

Metals

View full text Add to dashboard Cite

Abstract:The effect of mechanical activation on the copper leaching of copper sulfide, CuS, in 1 M HNO 3 (slurry density: 10 g/L) was investigated by analysis of the leachability and the apparent activation energy. Mechanical activation produced an increase in the leachability and a decrease of the activation energy in this leaching reaction. The leachability increased proportionally to the degree of mechanical activation, reaching 96.6% leaching within 60 min at 80 • C from CuS ground at 700 rpm for 15 min. This leaching process was controlled by surface chemical reaction following the shrinking-core model. The apparent activation energy of leaching for CuS (71.5 kJ/mol) in the range of 50 to 80 • C decreased with an increase of the degree of mechanical activation, reaching 44.3 kJ/mol for Cu leaching from CuS ground at 700 rpm for 15 min.

show abstract

Life Cycle Assessment of Microwave Hot Air Systems

Chen

Peng

2013

4th International Symposium on High‐Temperature Metallurgical Processing

View full text Add to dashboard Cite

Characterization of blast furnace sludge and removal of zinc by microwave assisted extraction

Cited by 97 publications

References 23 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

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Life Cycle Assessment of Microwave Hot Air Systems

Contact Info

Product

Resources

About