slag, copper smelting

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Well documented study performed according to EU acceptable method

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Remarks:

Other quality assurance

Type of method:

thermal analysis

Test material

Test material information

Constituent 1

Reference substance name:

Iron silicate, copper smelting and refining

EC Number:

701-480-0

Cas Number:

67711-92-6

IUPAC Name:

Iron silicate, copper smelting and refining

Details on test material:

Melting point was tested on two representative sample types :
Type I: Slag, Granules, Primary ( Sample 09TT02641)
Type III: Slag, Slow cooled, primary ( Sample 09TT05244)
Due to differences in crystalization during slag cooling ( rapid coolig /granulation or slow cooling) and silacate phases formed an effect on melting point is expected.
Sampling and sample preparation was performed according to ECI/REACH C1 Sampling Protocol. The C1 sampling protocol also provides detailed information on the identity of the samples (see IUCLID section 1.4).

Results and discussion

Melting / freezing point

Melting / freezing point 1

Melting / freezing pt.:

ca. 1 341 °C

Decomposition:

yes

Decomp. temp.:

ca. 1 341 °C

Remarks on result:

other: Sample 09TT02641

Melting / freezing point 2

Melting / freezing pt.:

ca. 1 027 °C

Decomposition:

yes

Decomp. temp.:

ca. 1 027 °C

Remarks on result:

other: Sample 09TT05244

Any other information on results incl. tables

During the TG/DSC tests the sample was heated in Al₂O₃crucible using nitrogen atmosphere and air atmosphere.

Sample Type I (09TT02641)

No endothermic peaks were found during the test in nitrogen atmosphere. The test in air atmosphereshowed endothermic peaks at the temperature ranges 1341 – 1360 °C and 1412 – 1429 °C. These peaks indicate melting.

 

Sample Type III (09TT05244)

No endothermic peaks were found during the test in nitrogen atmosphere. The test in air atmosphere showed endothermic peak at the temperature range 1027 – 1043 °C, which indicates melting. The mass of the sample starts to decrease at the temperature ~1150 °C, which indicate some decomposition and evaporation.

Results from thermal analysis are:

Sample type	Slag Type I	Slag Type III
Outotec code	09TT02641	09TT05244
First endothermic peak in nitrogen	No	No
Melting starts in air	1341 °C	1027 °C

Applicant's summary and conclusion

Conclusions:

Based on the TG/DSC measurements, the melting in air starts at the temperature 1341 °C for granulated type slags and at temperature 1027 °C for slow cooled type slags..

Executive summary:

Based on the TG/DSC measurements, the melting in air starts at the temperature 1341 °C for granulated type slags and at temperature 1027 °C for slow cooled type slags.