Pyrites, Calcined (calcined Pyrites)
PYRITES, CALCINED (calcined pyrites)
Schedule source MSC.539(107), Annex 9, Appendix 1, IMSBC Code Amendment 07-23 · pages 367, 368
Description
Dust to fines, calcined pyrites is the residual product from the chemical industry where all types of metal sulphides are either used for the production of sulphuric acid or are processed to recover the elemental metals – copper, lead, zinc, etc. The acidity of the residue can be considerable, in particular, in the presence of water or moist air, where pH values between 1.3 and 2.1 are frequently noted.
Hazard
Highly corrosive to steel when wet. Inhalation of dust is irritating and harmful. This cargo may liquefy if shipped at a moisture content in excess of its transportable moisture limit (TML). See sections 7 and 8 of IMSBC Code. This cargo is non-combustible or has a low fire risk.
Stowage and Segregation
“Separated from” foodstuffs.
Hold Cleanliness
Due consideration shall be given to cleaning and drying of the cargo spaces.
Weather Precautions
This cargo shall be kept as dry as practicable before loading, during loading and during the voyage. This cargo shall not be loaded during precipitation. During loading of this cargo, all non-working hatches of the cargo spaces to which this cargo is loaded, or to be loaded, shall be closed.
Loading
Trim in accordance with the relevant provisions required under sections 4 and 5 of IMSBC Code. As the density of the cargo is extremely high, the tank top may be overstressed unless the cargo is evenly spread across the tank top to equalize the weight distribution. Due consideration shall be given to ensure that the tank top is not overstressed during the voyage and during loading by a pile of the cargo.
Precautions
Bilge wells shall be clean, dry and covered as appropriate, to prevent ingress of the cargo. Ceiling boards shall be removed or sealed to prevent penetration by this cargo. The tank top on which this cargo is to be loaded shall be covered with protective coating such as lime-wash before loading to avoid any potential corrosive reaction between the cargo, water and steel.
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