Fundamental Properties of Blocks which Set Steel Slag by Hydration Reaction and Biofouling Build-up Properties on Exposure to Marine Environment

Matsunaga, Hisahiro; Takagi, Masaaki; Kogiku, F.

doi:10.2355/tetsutohagane1955.89.4_454

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…Finally, the attachment of aquatic organisms to the tested slag surface is examined. 3) Values for respective elements of EQS have generally been established based on the sensitivity of some model organisms to each element. Consequently, exposures of organisms to multiple elements such as slag eluate have not been considered on EQS.…”

Section: )mentioning

confidence: 99%

“…Then they were estimated as the amounts of total carbonate species. Each concentration of CO 2 (aq), HCO 3 − , and CO 3 2 − was calculated from the amounts of total carbonate species and pH values using the following Henderson-Hasselbalch Eqs. (4) and (5).…”

Section: Effects Of Slag Eluate On Concentrations Ofmentioning

confidence: 99%

“…Figure 7 represents the relation between the fraction of carbonate species calculated with Henderson-Hasselbalch equations and their respective pH levels. The fraction of HCO 3 − was the highest content of carbonate species at pH 7.2, which was experimental conditions used in this study. Therefore, Ca 2 + in eluate presumably reacted with HCO 3 − as described in Eq.…”

Section: Relation Between Calcium Of Alkaline Earth Metalsmentioning

confidence: 99%

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Bioassay of Components Eluted from Electric Arc Furnace Steel Slag Using Microalgae <i>Chlorella</i>

Takahashi

Yokoyama

2016

ISIJ International

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Several amounts of electric arc furnace (EAF) steel slag ultimately end up in final landfill sites. After developing a method to estimate the impacts of eluate from slag, particularly on phytoplankton, this study assessed novel slag applications to aquatic environments. First, metal components were eluted from EAF slags of common steel or stainless steel with a leaching condition based on JIS K 0058-1. The metal components in slag were analyzed using emission spectrochemical analyses. After incubation of green algae Chlorella as phytoplankton with culture media containing eluates from the respective slags, the effects of the respective eluates on algae were investigated using microscopy and flow cytometry. Results demonstrated that concentrations of metal effluents from slags, even for EAF steel slag, which included more hazardous materials than common slag, were almost all lower than environmental quality standards for effluent and drinking water. Analyses of algal cells treated with each eluate revealed that eluate induced neither lethality nor growth inhibition. Instead of cytotoxicity, the addition of each eluate enhanced algal growth. Infrared spectroscopy and potentiometry using a diaphragm-type electrode to measure aquatic CO 2 revealed that metal components from both slags in media produced greater amounts of aquatic CO 2 available for photosynthesis, thereby enhancing algal proliferation. Taken together, results show that using EAF slag in aquatic environments might be beneficial, not toxic, for photosynthetic organisms. Furthermore, bioassay using flow cytometry can estimate vigorous and aberrant algal growth simultaneously.

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Section: )mentioning

confidence: 99%

Section: Effects Of Slag Eluate On Concentrations Ofmentioning

confidence: 99%

Section: Relation Between Calcium Of Alkaline Earth Metalsmentioning

confidence: 99%

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Bioassay of Components Eluted from Electric Arc Furnace Steel Slag Using Microalgae <i>Chlorella</i>

Takahashi

Yokoyama

2016

ISIJ International

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“…This estimation, based partly on the observation shown in Fig. 6 (Matsunaga et al, 2003), is as follows. If a sea bed area of 1082 km 2 (which equals three times the area of Japan) at shallow depth were chosen near Japan and capped by steelmaking slags of 0 .…”

Section: Promotion Of Scrap Recyclingmentioning

confidence: 99%

Strategies and achievements for moving towards minimum wastes and emissions in Asian steel industry

Emi¹,

Min²

2005

Ironmaking & Steelmaking

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Strategies and achievements in the Asian steel industry in constructing an industrial ecological chain are reviewed, largely for the cases of Japan, Korea and China. Emphasis is placed on the development of a resource recycling system for the minimisation of various wastes and emissions of greenhouse gases, toxic gases and polluting particulates. The minimisation strategy includes: N rationalisation of ironmaking and steelmaking processes N implementation of available relevant measures/technologies N life cycle assessment in designing steel from semis to assembled products N reduction, reuse and recycling of materials and energies N utilisation of competent core technologies to process domestic and industrial wastes.In view of the global nature of the above waste and emission issues, interindustrial linkage and international cooperation across the borders among Asian countries have become more important. Interindustrial linkage definitely serves to cut back wastes and emissions. Examples of such linkage and factors influencing the sustainability of the linkage are described, with expectation of further development of the linkage. The importance of international cooperation cannot be overstressed under the circumstances where steel production in 2004 exceeded 260 Mt in China and 1 Gt worldwide and is still increasing. Practical measures are discussed to enhance the linkage and cooperation for effectively promoting reduction, reuse and recycling, including implications for the nonferrous industry.

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“…Particularly in the event of CaO hydration, steelmaking slag exhibits the hydration swelling 5) due to the free lime, thus restricting the applicatory use of the steelmaking slag. Under such circumstances, some stabilizing treatment methods such as aging, 6) carbonation, 7) etc. are under review.…”

Section: Introductionmentioning

confidence: 99%

The Application of Infrared Spectrophotometry to Analysis of Dehydration Process of Inorganic Hydroxides and Evaluation of Monolithic Refractories

Saito

Goto²,

Fujioka

et al. 2008

ISIJ Int.

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Inorganic oxides are widely used as raw materials and formed as byproducts in iron and steelmaking processes. Some inorganic oxides such as CaO and MgO absorb water to form inorganic hydrates. When hydrates form, they expand. On the other hand, hydrates often dehydrate on heating to form oxides. To analyze hydrates in oxides is therefore important in order to examine hydration and dehydration processes.This paper concerns with the analysis of dehydration processes of Mg(OH) 2 , Ca(OH) 2 and Al(OH) 3 in which high temperature infrared spectrophotometry and thermogravimetry (TG) were used to elucidate the expansion behavior of monolithic refractories. Two monolithic refractories, which contained the same amount of MgO, were investigated with hydration. Mg(OH) 2 was observed in the samples that expanded after pressed. No Mg(OH) 2 was observed in the sample that did not expand after pressed. In addition, infrared spectrums give the amount of Mg(OH) 2 . Infrared spectrophotometry can be used for the quantitative analysis of the small amount of inorganic hydrates in oxides.

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Fundamental Properties of Blocks which Set Steel Slag by Hydration Reaction and Biofouling Build-up Properties on Exposure to Marine Environment

Cited by 9 publications

References 4 publications

Bioassay of Components Eluted from Electric Arc Furnace Steel Slag Using Microalgae <i>Chlorella</i>

Bioassay of Components Eluted from Electric Arc Furnace Steel Slag Using Microalgae <i>Chlorella</i>

Strategies and achievements for moving towards minimum wastes and emissions in Asian steel industry

The Application of Infrared Spectrophotometry to Analysis of Dehydration Process of Inorganic Hydroxides and Evaluation of Monolithic Refractories

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