black copper, copper smelting

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No GLP study but other quality assurance

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Test guideline

Qualifier:

according 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:

copper

EC Number:

918-452-0

IUPAC Name:

copper

Details on test material:

Representative samples were collected according to standards sampling protocols from the REACH Copper Consortium (in attachment in iuclid 1.4 & 4.1)
B5, description: low Ni content (representative, not sieved granules), sampling code: MC_B5_El LNi_1A_comp0902_0904, lab code: 09TT02791
B5, description: low Ni content (homogenized, drilled, sieved), sample code: MC_B5_El LNi_1B_comp0902_0904, lab code: 09TT02772
B5, description: High Ni content (representative, not sieved granules), sample code: MC_B5_El HNi_2A_comp0902_0904, lab code: 09TT02792
B5, description: high Ni content (homogenized, drilled, sieved), sample code: MC_B5_El HNi_2B_comp0902_0904, lab code: 09TT02774

Results and discussion

Melting / freezing point

Melting / freezing point 1

Melting / freezing pt.:

643 - 774 °C

Remarks on result:

other: sample 09TT02771

Melting / freezing point 2

Melting / freezing pt.:

652 - 830 °C

Remarks on result:

other: Sample 09TT02773

Any other information on results incl. tables

During the melting tests of the two (2) black copper samples were heated in Al₂O₃ crucible using nitrogen atmosphere.

Table 6: Melting and oxidation

Sample	Black Copper	Black Copper
Sample	B5	B5
Outotec code	09TT02771	09TT02773
First endothermic peak in nitrogen	643 - 774 °C	652 - 830 °C
Decomposition and/or melting starts	643 °C	652 °C

09TT02771

The endothermic peaks in the curve are at the temperature ranges 643 – 774 °C, 905 – 924°C and 1029 – 1073 °C. The mass of the sample starts to decrease slowly at the temperature range ~200 °C and decreasing becomes faster at ~800 °C. This indicates evaporation or decomposition of some components. The peak at the temperature range 1029 – 1073 °C indicates melting.

09TT02773

The endothermic peaks in the curve are at the temperature ranges 652 – 830 °C and 1036 – 1150 °C. Because the mass of sample starts to decrease later than the first peak is, this indicate, that some components melt already at the temperature 652 – 830 °C.  Evaporation and decomposition starts above 750 °C.

Applicant's summary and conclusion

Conclusions:

Based on the TG/DSC measurements, the melting of the black copper samples 09TT02771 and 09TT02773 start at 643 °C and 652 °C.