Registration Dossier
Registration Dossier
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EC number: 293-314-4 | CAS number: 91053-49-5 Insoluble substance obtained during dissolution of zinc ores or concentrate in sulfuric acid for the production of zinc sulfate solutions after physical separation such as flotation and filtration.
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- 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:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- GLP compliance:
- not specified
- Type of method:
- thermal analysis
- Decomposition:
- yes
- Decomp. temp.:
- ca. 630 °C
- Remarks on result:
- other: results obtained in nitrogen
- Decomposition:
- yes
- Decomp. temp.:
- ca. 700 °C
- Remarks on result:
- other: results obtained in air
- Conclusions:
- test done according to standard protocol, useful to assess the characteristic of the substance
- Executive summary:
The melting point of the substance was determined by thermo gravimetrical (TGA) measurements.
Sulfate decomposition starts in nitrogen at ca. 630°C and in air at ca. 700°C.
Reference
During the melting test the studied neutral leach residue sample the exothermic peaks in the curve are at the temperature range 689 – 700 °C and 830 - 842 °C. These peaks indicate reactions with nitrogen.
The endothermic peak in the curve is at the temperature 730 – 751 °C, which indicate sulphate decomposition.
The mass of the sample decreases step by step all the time, which indicates dehydration.
During the oxidation test of the studied neutral leach residue sample no endothermic or exothermic peaks in the curve were found. The mass of the sample decreases step by step all the time, which indicates dehydration and sulphate decomposition.
Description of key information
Sulfate decomposition starts in nitrogen at ca. 630°C and in air at ca. 700°C (Outotec, 2010).
Key value for chemical safety assessment
Additional information
Various types of leach residues were analyzed. They display differences in phys-chem. properties depending on their chemical composition. The most representative leach residue was used.
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