Key data
| Stowage factor | 0.34–0.45 m³/t (typical 0.38)12.0–15.9 ft³/t (typical 13.4) |
|---|---|
| Form | Bulk |
| IMSBC group | A Cargoes that may liquefy if shipped above their moisture limit. |
| BCSN | ZINC CONCENTRATE |
ft³/t values are per metric tonne (1 m³/t ≈ 35.31 ft³/t). Stowage factors are indicative — see note below.
Description
Zinc concentrate is a fine, heavy product of ore processing, shipped to smelters. At around 0.38 m3/t it is a dense, deadweight cargo. It carries the classic concentrate hazards: a Group A liquefaction risk if shipped too wet, concentrated weight, and toxic, metal-bearing dust.
Stowage & loading
Loading proceeds only with moisture content shown to be below the transportable moisture limit, supported by certificates and checks, as wet concentrate can liquefy. The dense cargo is loaded by grab or conveyor with attention to tank-top strength and even weight distribution.
Hazards & handling
Liquefaction is the headline risk: moisture above the TML lets the cargo flow and form a destabilising free surface. The high density can overstress the structure if poorly distributed, and the fine dust contains heavy metals, so dust control and hygiene protect both ship and crew.
Carriage & discharge
The stow is monitored for moisture migration, free water or surface movement, with conditions logged. Discharge is by grab from a stable face; the toxic dust is controlled, and holds are cleaned thoroughly of the clinging, metal-bearing residue on completion.
Key hazards
- Liquefaction if moisture exceeds the transportable moisture limit
- Structural overstress from concentrated weight
- Toxic, heavy-metal-bearing dust
Loading precautions
- Confirm moisture is below the TML with certificates and own checks
- Distribute the dense load to respect tank-top strength
- Control toxic dust and observe hygiene precautions
Stowage factors are indicative and vary with grade, origin, moisture and packing. Always verify against the shipper's cargo declaration and the applicable IMSBC Code schedule before fixing or loading. This is general information, not professional or safety advice.