Strontium ferrite powders prepared from oily cold rolling mill sludge by solid-state reaction method

Liu, Bo; Zang, Shen-Gen; Tian, Jianjun; Pan, De’an; Zhu, Hang-Xin

doi:10.1007/s12598-013-0155-5

Cited by 15 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, the chemical composition of the mill scale varies according to the type of steel produced and the process used. Maghemite (Fe 2 O 3 ) and pure iron (Fe) were identified to be the most abundant iron phases from a cold rolling mill sludge (Liu et al, 2013b), while others have reported a rolling mill scale comprised mainly of metallic iron and a mixture of the iron oxides wüstite (FeO), hematite (α-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) (Martín et al, 2012). Our material appears closer to this latter composition.…”

Section: Msupporting

confidence: 61%

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Gómez

Wright

Esquenazi

et al. 2019

Journal of Cleaner Production

View full text Add to dashboard Cite

Oily hot rolling mill (HRM) sludge containing a high percentage of iron oxides has been treated under microwave irradiation, and the products compared to hexane washed and thermal treated sludges. Metals present in the sludge act as a highly microwave-absorbent material, creating hot spots that trigger the stripping of the water and oils under air. The sludge looses 5 wt.% of water and volatiles under 5 min of microwave irradiation (1000 W at 2,450 MHz), which represents a similar reduction in weight as 4 h heating at 200 °C, but with savings in energy and time. Most importantly, after microwave irradiation, the material also shows an improvement in its rheological properties (free flowing and smaller particle size) and changes in its chemical composition. Microwaved samples are less oxidized than heated ones (lower Fe 3+ content), which is an advantage recycling the sludge as a source of iron with lower oxidation state necessitates a lower coke:ore ratio for blast furnace operation. Highlights• Oily hot rolling mill (HRM) sludge treated with microwave radiation.• Water and hydrocarbon content reduced by microwave treatment.• Reduction of the iron oxidation state of the iron oxides after microwave treatment.

show abstract

Section: Msupporting

confidence: 61%

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Gómez

Wright

Esquenazi

et al. 2019

Journal of Cleaner Production

View full text Add to dashboard Cite

show abstract

“…It has been estimated that 2 tons of oil sludge are generated from the treatment of 400 t of wastewater. The oily sludge (also known as cold-rolling sludge) is rich in iron, containing 40.5-47.6 wt.% Fe, thus being a potential secondary raw material source [83].…”

Section: Industrial Synergies and Recovery Technologies-metal Processingmentioning

confidence: 99%

Potential Industrial Synergies in the Steelmaking and Metal-Processing Industry: By-Products Valorization and Associated Technological Processes

Henriques,

Castro,

Dias

et al. 2023

Sustainability

View full text Add to dashboard Cite

Steelmaking and ferrous metal processing companies are suppliers of great importance to a wide array of industries, thus being quintessential for the social and financial growth of regions and countries. Most used processes (i.e., blast furnace, basic oxygen furnace, and electric arc furnace-based) are, however, highly pollutant, generating hazardous wastes that were usually landfilled. Generated wastes are important sources of secondary raw materials such as zinc and iron, presenting interesting market value. Hence, aiming to develop green procedures, industries have been using diverse approaches to treat and detoxify hazardous wastes, extract and reuse added value components, or even use their existing infrastructures to convert the wastes generated by other industries into secondary raw materials for steel manufacturing. This paper reviews the main industrial processes, focusing on the waste-generating steps, and discloses the most recent and relevant industrial synergies toward a circular economy. The final contribution of this study consists of the compilation of industrial synergies and recovery technologies for the steelmaking and metal processes.

show abstract

“…102,103 Vacuum chloration and vacuum distillation were combined to recover rare earths chlorides (neodymium and dysprosium) from neodymium magnet sludge. 104 Vacuum distillation and vacuum pyrolysis were used for recycling oily cold rolling mill sludge 105 and plant oil asphalt, 106 respectively. Additionally, some other VMS methods are attempted for some special wastes recycling, like vacuum dynamic flash reduction and so on.…”

Section: Perspectives On Vmsmentioning

confidence: 99%

State-of-the-Art of Recycling E-Wastes by Vacuum Metallurgy Separation

Zhan

2014

Environ. Sci. Technol.

View full text Add to dashboard Cite

In recent era, more and more electric and electronic equipment wastes (e-wastes) are generated that contain both toxic and valuable materials in them. Most studies focus on the extraction of valuable metals like Au, Ag from e-wastes. However, the recycling of metals such as Pb, Cd, Zn, and organics has not attracted enough attentions. Vacuum metallurgy separation (VMS) processes can reduce pollution significantly using vacuum technique. It can effectively recycle heavy metals and organics from e-wastes in an environmentally friendly way, which is beneficial for both preventing the heavy metal contaminations and the sustainable development of resources. VMS can be classified into several methods, such as vacuum evaporation, vacuum carbon reduction and vacuum pyrolysis. This paper respectively reviews the state-of-art of these methods applied to recycling heavy metals and organics from several kinds of e-wastes. The method principle, equipment used, separating process, optimized operating parameters and recycling mechanism of each case are illustrated in details. The perspectives on the further development of e-wastes recycling by VMS are also presented.

show abstract

Strontium ferrite powders prepared from oily cold rolling mill sludge by solid-state reaction method

Cited by 15 publications

References 17 publications

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Potential Industrial Synergies in the Steelmaking and Metal-Processing Industry: By-Products Valorization and Associated Technological Processes

State-of-the-Art of Recycling E-Wastes by Vacuum Metallurgy Separation

Contact Info

Product

Resources

About