Registration Dossier
Registration Dossier
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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.
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1992
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Guideline study using national guidelines. Study meets generally accepted scientific principles. Study acceptable for assessment
Data source
Reference
- Reference Type:
- publication
- Title:
- Unnamed
- Year:
- 1 992
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: DIN 38414-4:1984-10 German standard methods for the examination of water, waste water and sludge; sludge and sediments (group S); determination of leachability by water (S4)
- Deviations:
- not specified
- Principles of method if other than guideline:
- pH measurement with standard laboratory equipment (pH electrode)
- GLP compliance:
- no
- Remarks:
- FEhS uses national guidelines and has several SOP (standard operation procedures)
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:
- Blast furnace slags can crystallize depending on the chemical composition, pH value and cooling velocity. The structure of the solid liquid is to some extend crystalline, with the minerals embedded in a vitreous matrix. The slower the cooling process, the more crystalline structures will be formed. Slags are very similar to natural rocks, e.g. basalt or granite.
Constituent 1
Results and discussion
pH valueopen allclose all
- pH value:
- 11
- Temp.:
- 20 °C
- Concentration:
- ca. 100 g/L
- Remarks on result:
- other: result reported for ABS
- pH value:
- 10
- Temp.:
- 20 °C
- Concentration:
- ca. 100 g/L
- Remarks on result:
- other: result reported for GBS
Applicant's summary and conclusion
- Conclusions:
- Leachates of cooled blast furnace slags are basic.
- Executive summary:
The pH of leachates according to DIN 38414 DEV S4 (100 g/L) of air-cooled blast furnace slags (ABS) is (approximately) 11, and the pH of leachates of granulated blast furnace slags is (approximately) 10.
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