Slags, copper refining

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

Type of method:

thermal analysis

Test material

Test material information

Constituent 1

Reference substance name:

Slag, copper refining

IUPAC Name:

Slag, copper refining

Details on test material:

Sample collection made according to ECI/REACH Copper Consortium Standards Protocols (see IUCLID section 1.4)
Sample Description Sample Code Lab code
B8 copper-rich slag from Secondary smelter MC_B8_531_xxx_0904 09TT03335
B8 Cu-rich slag, from slag concentrator, primary smelter (representative, homogenized) slag concentrate 09TT03987
B8 Cu-rich slag from FSF, primary smelter (representative, homogenized) slag from FSF, primary smelter 09TT05248
B8 Cu-rich slag from anode furnace, primary smelter (representative, homogenized) slag from anode furnace 09TT05247

Results and discussion

Melting / freezing point

Melting / freezing point 1

Melting / freezing pt.:

738 °C

Remarks on result:

other: 09TT03335

Melting / freezing point 2

Melting / freezing pt.:

1 044 °C

Remarks on result:

other: 09TT05247

Melting / freezing point 3

Melting / freezing pt.:

1 051 °C

Remarks on result:

other: 09TT05248

Any other information on results incl. tables

During the melting tests of thefour (4) slag samples were heated in Al₂O₃crucible using nitrogen atmosphere. Based on the TG/DSC measurements, the melting and decomposition of the slags 09TT03335, 09TT05247 and 09TT05248 start at 738^oC, 1044 °C and 1051°C and these materials are completely oxidized.

09TT03335, Slag recycled

The endothermic peaks in the curve are at the temperature ranges 738 – 844 °C, 873 – 1026 °C and 1179 – 1357 °C. The mass of the sample starts to decrease, when temperature has increased higher than 900 °C. The first peak indicates melting of some components of the sample (perhaps lead or tin components), but when temperature is higher than 900 °C also decomposition and evaporation takes place, because the mass of the sample decreases. 

09TT03987, Slag concentrate

The endothermic peak in the curve is at the temperature range 1102 – 1121 °C. The mass of the sample starts to decrease at the temperature ~750 °C, which indicates decomposition of some sulphides. Melting starts at 1102 – 1121 °C.   

09TT05247, Anode furnace slag

The endothermic peaks in the curve are at the temperature ranges 1044 – 1082 °C and 1143 – 1191 °C. The first peak indicates melting, because the mass of the sample does not change. The second peak indicates decomposition and evaporation, because the mass of the sample starts to decrease. 

09TT05248, Flash smelting slag

The endothermic peak in the curve is at the temperature range 1051 – 1129 °C and at the same time the mass of the sample starts to decrease, which means, that melting starts, but some components also decompose or evaporate.

Applicant's summary and conclusion

Executive summary:

Based on the TG/DSC measurements, the melting and decomposition of the slags 09TT03335, 09TT05247 and 09TT05248 start at 738^oC, 1044 °C and 1051°C and these materials are completely oxidized.