C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/10
C22B 1/243 (2006.01) C21B 13/00 (2006.01)
Patent
CA 1178059
ABSTRACT OF THE DISCLOSURE In a process for treating porous iron-containing particles, in particular iron sponge, for preventing reoxi- dation and/or corrosion during storage and transport, the iron sponge particles are rolled in calcined lime stone dust (lime dust) and then the particles are humidified with an amount of water which is less than that required for completely hydrating the calcined lime stone. Hydrophobing additives such as stearates, oleates, paraffins, oils, soaps or waste materials containing fats and soaps are added to the calcined lime stone dust, said hydrophobing additives being preferably added to the slaking water in form of water-soluble compounds such as ammonium stearate. The hydrophobic additives can be mixed with the calcined lime stone and optionally iron oxide dust. The process can also be performed such that two coatings are applied to the iron sponge particles to be treated in which case the hydrophob- ing additives are added within the second coating only.
387050
Saiger Gunther
Stift Kurt
Sulzbacher Horst
Marks & Clerk
Voest - Alpine Aktiengesellschaft
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