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EC number: 266-002-0 | CAS number: 65996-69-2 The fused substance formed by the action of a flux upon the gangue of the iron-bearing materials charged to a blast furnace and upon the oxidized impurities in the iron produced. Depending upon the particular blast furnace operation, the slag is composed primarily of sulfur and oxides of aluminum, calcium, magnesium, and silicon.
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Additional ecotoxological information
Administrative data
- Endpoint:
- additional ecotoxicological information
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1995-2000
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Guideline study using national guideline. Study meets generally accepted scientific principles. Study acceptable for assessment
Cross-reference
- Reason / purpose for cross-reference:
- reference to same study
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- Physical and chemical characteristics of blast furnace, basic oxygen furnace, and electric arc furnace steel industry slags
- Author:
- Proctor DM, Fehling KA, Wittenborn JL, Green JJ, Avent C, RD Bigham, Connolly M, Lee B, Shepker TO, Zak MA
- Year:
- 2 000
- Bibliographic source:
- Environ. Sci. Technol. 34, 1576-1582.
- Reference Type:
- other: Guidance document used in this study
- Title:
- Unnamed
- Year:
- 1 989
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: ASTM 1311 Toxicity Characteristic Leaching Procedure
- Deviations:
- no
- Principles of method if other than guideline:
- US EPA (Environmental Protection Agency), Office of Emergency and Remedial Response 1989 Assessment Guidance for Superfund Volume 1, Human Health Evaluation Manual Part A; interim final; EPA/540/1-89/002; US Government Printing Office: Washington, DC
- GLP compliance:
- not specified
- Type of study / information:
- Assessment by comparison of slag leachates (from acidic elution) with US TCLP screening criteria; Risk Assessment Guidance for Superfund Volume 1, Human Health Evaluation Manual Part A; interim final; EPA/540/1-89/00
Test material
- Reference substance name:
- Slags, ferrous metal, blast furnace
- EC Number:
- 266-002-0
- EC Name:
- Slags, ferrous metal, blast furnace
- Cas Number:
- 65996-69-2
- Molecular formula:
- ~ Al(n)Ca(m)Mg(o)Si(p)O(3n/2+m+o+2p)
- IUPAC Name:
- Aluminium-Calcium-Magnesium-Silicium oxide equivalent
- Details on test material:
- see below for ananlytical information
Constituent 1
Results and discussion
Any other information on results incl. tables
Comparison of metal concentrations of acidic slag leachates (TCLP) to US TCLP criteriaf
Metal |
TCLP screening criteriona(mg/L) |
BF95% upper confidence limit (TCLP)b |
Criterion exceeded? BF |
Arsenic |
5 |
0.0048c |
no |
Barium |
100 |
1.2d |
no |
Cadmium |
1 |
0.0054e |
no |
Chromium(VI) |
5 |
0.026c |
no |
Chromium (total) |
5 |
0.22d |
no |
Lead |
5 |
ND |
no |
Mercury |
0.2 |
ND |
no |
Selenium |
1 |
ND |
no |
Silver |
5 |
ND |
no |
aASTM 1311 Toxicity Characteristic Leaching Procedure.b95percentile upper confidence limit.cMaximum leachate concentration if detection frequency is less than 50%.dMaximum concentration if exceeded by the 95percentile upper confidence limit.elog-normal 95percentile upper confidence limit.fTCLP, toxicity characteristics leaching potential; ND, not detected.
Applicant's summary and conclusion
- Conclusions:
- Not ecotoxic
- Executive summary:
Major analytical constituents of ferrous slag are aluminium, calcium, iron, magnesium, manganese, phosphorus, silicon, and sulfur.
The essential elements calcium, carbon, magnesium, phosphorus and sulfur are ubiquitous in the earth´s crust and are not relevant for risk assessment (US EPA 1989).
The release of metals from the matrix into the leaching liquid was very low. In general, it was less than 0.1 % of the metals.
None of the metal concentrations in the leachates exceeded US EPA leaching threshold values for (eco)toxicity (Proctor et al. 2000).
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