Substance description/characteristics
1. Name and other identifiers of the substance:
The substance Leach residues, zinc ore-calcine, zinc cobalt is a UVCB (origin: inorganic)
| EC number: | 273-769-5 |
| EC name: | Leach residues, zinc ore-calcine, zinc cobalt |
| CAS number (EC inventory): | 69012-72-2 |
| IUPAC name: | |
| Description: | Insoluble cobalt-nickel containing residue after reduction of those elements from pregnant solutions |
| Molecular formula: | n.a. |
| Molecular weight range: | n.a. |
| Physical state: | solid at 20°C and 1013 hPa |
2. Source, Process and Conclusion
| Source |
Cobalt-Nickel loaded zinc sulphate solution |
| Process |
A reducing agent is added (e.g. Zinc powder, PbO and As/Sb salts ...) to the Cobalt and Nickel loaded Zinc Sulphate solution and precipitation (cementation) of a Cobalt/Nickel-rich metallic precipitate ensues. After that 'cementation' reaction, separation of the precipitate occurs in dedicated settler. The precipitate is optionally re-pulped in a second reaction tank with a slightly acidic sulphate solution in order to dissolve the excess of un-reacted zinc powder and potentially co-precipitated Cadmium. Eventually, the Cobalt/Nickel-rich filter-cake is washed and filtered out of the suspension using press-filters. The Co/Ni rich filter-cake is stored (covered) before being transferred as Intermediate to the special treatment unit, typically used in production units of Cobalt and Nickel recovery. In case of transport to other premises, the Intermediate will be loaded in ADR-regulated big-bags or containers (barrels, small containers, bulk containers, silo-trucks, …). The ‘Cobalt/Nickel cement’ is optionally blended with other Cobalt / Nickel -containing primary or secondary materials. |
| Conclusion |
Insoluble cobalt-nickel containing residue after reduction of those elements from pregnant solutions, typically used in production units of Cobalt and Nickel recovery. |
3. Composition
The boundary composition of Leach residues, zinc ore-calcine, zinc cobalt is detailed here below.
Elemental composition - boundary:
| Core | min (% w/w) | max (% w/w) | typical (% w/w) |
| Zn | 1 | 30 | 11,6 |
| Cu | 1 | 80 | 18,8 |
| Cd | 0,1 | 20 | 0,53 |
| Co | 1 | 15 | 4,02 |
| Ni | 0,5 | 40 | 2,53 |
| Fe | 0,1 | 15 | 0,97 |
| Pb | 0,3 | 30 | 15,7 |
| Si | 0 | 1,4 | 0,57 |
| As | 0 | 3 | 0,006 |
| Sb | 0,1 | 3 | 0,4 |
| Ca | 0 | 0,6 | 0,14 |
Mineralogical composition - boundary:
| Core | min (% w/w) | max (% w/w) | typical (% w/w) |
| PbSO4 | 0,35 | 35,13 | 18,38 |
| CuSO4 | 1,35 | 99,9 | 25,47 |
| Cu(OH)2 | 0,23 | 18,44 | 4,33 |
| Zn(OH)2 | 0,3 | 9,12 | 3,53 |
| ZnSO4 | 1,73 | 51,85 | 20,05 |
| Zn | 0,1 | 3 | 1,16 |
| Cu | 0,4 | 32 | 7,52 |
| CdSO4 | 0,18 | 37,09 | 0,98 |
| Co2O3 | 1,4 | 21,1 | 5,66 |
| NiO | 0,63 | 50,9 | 3,22 |
| Fe(OH)2 | 0,16 | 24,14 | 1,56 |
| Pb | 0,06 | 6 | 3,14 |
| SiO2 | 0 | 1,4 | 1,23 |
| As2O3 | 0 | 3,96 | 0,008 |
| Sb2O3 | 0,12 | 3,59 | 0,4 |
| CaSO4 | 0 | 2 | 0,47 |
4. Classification
| The classification is always based on the worst case. For the Leach residues, zinc ore-calcine, zinc cobalt, this corresponds to: | |
|
Acute toxicity - oral |
Acute oral 3 |
|
Acute toxicity - inhalation |
Acute inhal. 4 |
|
Skin corrosion / irritation |
Skin irrit. 2 |
|
Serious eye damage / eye irritation |
Eye damage 1 |
|
Skin sensitisation |
Skin sens. 1A |
|
Respiratory sensitisation |
Resp. sens. 1B |
|
Germ cell mutagenicity |
Muta. 2 |
|
Carcinogenicity |
Carc. 1A |
|
Reproductive toxicity |
Repr. 1A |
|
Specific target organ toxicity - repeated (STOT-RE) |
STOT RE 1 |
|
Hazardous to the aquatic environment (acute / short-term) |
Aquatic Acute 1 |
|
Hazardous to the aquatic environment (long-term) |
Aquatic Chronic 1 |