Slags, steelmaking, converter

Distribution modelling

Administrative data

Endpoint:

distribution modelling

Type of information:

other: Modelling of environment

Adequacy of study:

other information

Study period:

2006

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Data from peer-reviewed handbook or collection of data

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

2006

Materials and methods

Model:

other: Soil, groundwater and surface waters were modelled.

Calculation programme:

Several progammes used

Media:

water - soil

Test material

Test material information

Constituent 1

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

Constituent 2

Reference substance name:

Slags, steelmaking, converter

EC Number:

294-409-3

EC Name:

Slags, steelmaking, converter

Cas Number:

91722-09-7

Molecular formula:

~ Al(n)Ca(m)Fe(o)Mg(p)Mn(q)Si(r)O(3n/2+m+o+p+q+2r)

IUPAC Name:

Aluminium-Calcium-Iron-Magnesium-Manganese-Silicium oxide equivalent

Constituent 3

Reference substance name:

Slags, steelmaking, elec. furnace

EC Number:

294-410-9

EC Name:

Slags, steelmaking, elec. furnace

Cas Number:

91722-10-0

IUPAC Name:

Slags, steelmaking, elec. Furnace

Results and discussion

Any other information on results incl. tables

Ratio between MTT-groundwater and background levels for deep groundwater according Crommentuijn (1997), and measured background levels in deep groundwater according Fraters (2001). MTT is lower than background levels

Component	Background level groundwater (Cbdeep µg/l) (Crommentuijn 1997)	Background level deep groundwater (ACdeep µg/l) (Fraters 2001)	MTTgw/Cbdeep (Crommentuijn 1997)	MTTgw/ACdeep (Fraters 2001)
Sb	0.09	0.16	69	39
As	7.0	5.4	3.4	4.4
Ba	200	160/990	0.15	0.18/0.03^1
Cd	0.06	0.05	5.7	6.8
Cr(III)	2.4	3.2	3.6	2.7
Co	0.6	0.7	5.0	4.3
Cu	1.3	<0.63	0.85	>1.8
Hg	-	0.05	-	4.6
Pb	-	1.3	6.9	8.5
Mo	0.7	1.6	41	18
Ni	2.1	8.8	0.90	0.22/2^1
Se	0.02	0.06	265	88
Sn	<2	<2	>10	>10
V	1.2	2.7	2.9	1.3
Zn	24	26	0.3	0.3

¹resp. sand, clay, peat

MTT = estimated additional toxic burden

Applicant's summary and conclusion

Conclusions:

Scientific assessment descibes the condition for use of slags in the environment.

Executive summary:

Proposals are made for Revision of the Building Materials Decree in the Netherlands (1999). Emission values were proposed for environmental politics to balance environmental protection with other socio-economic concerns.

Emission limit values for inorganic materials depend on the environmental compartment, the required protection, and the use pattern of the building material.

Soil, groundwater and surface waters were modelled. Soil modelling took into account e.g. time-dependent exposure of the soil to leachate, vertical transport through the soil profile and retardation of leachates in the soil profile. Surface water modelling took into account dilution assuming certain mixing zones, dependent on the size of the surface waters.

For proposing permitted emission levels, two alternatives were presented: a stand-still approach (based on quality target values) and a risk-based approach (based on PNECs). Both models were evaluated and proposals for leaching limit values of building materials were made on the basis of the foreseen use. Slags can be used as construction material in the environment provided that preconditions are fulfilled e.g. a certain ratio of water volume to slag weight is ensured.