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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.
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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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