Fig: Discharging iron ore -final stage
When loading any of these iron ore products, care should be taken to monitor the temperature of the cargo itself whether it is in pellet, lump or briquette form. If the temperature exceeds 65°C, it must not be loaded onboard. The alternate option is that the shipper's declaration provides information as to whether the cargo has been sufficiently treated for oxidation/ corrosion inhibition to avoid any chance of spontaneous combustion on increase in the moisture content.
Blended iron-ore
Blended iron-ore containing DRI (C) can be identified by its chemical composition, which must include: total iron (Fe) content; metallic iron (Feo) content; and moisture content. The information must be supported by a certificate from an independent testing laboratory and be related to the cargo offered for shipment. The certificate should state the method and standards followed when obtaining the tested samples (preferably ISO 10835) and when determining the metallic iron content (preferably ISO 5416).
If a blended iron-ore cargo contains any metallic iron it should be regarded as DRI (C) and carried in accordance with the IMSBC Code.
Problem with Mill Scale
Mill Scale, a by product of hot rolled steel-making, is a bulk commodity liable to liquefaction, like iron ore fines. Mill Scale and Mill Scale Fines possess a transportable moisture limit (TML) and have thus been confirmed as Group A cargoes, which should not be accepted for loading without the shipper having certified the moisture content and TML. Due to the high density of the cargo, the IMSBC Code requires that it should be trimmed flat for the voyage, distributing the weight evenly over the tank top - wet base cargoes are prone to shifting, as the bottom liquefies and the top of the stow becomes free to slide over the base.
More topics on iron ore
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