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US 4,076,520 AGranted
Method for continuous passivation of sponge iron material
AssigneeMidrex Corporation
InventorWolfgang B. Pietsch
Life of this patent
Estimating the term…
Abstract
A method for continuous passivation of hot sponge iron material, by feeding hot sponge iron material to a compactor, compacting the material to a high density elongated strip-like mass, cutting the mass longitudinally into a plurality of strips while simultaneously compacting the freshly cut longitudinal edges, cutting the strips transversely of their longitudinal dimensions while simultaneously compacting these freshly cut transverse edges.
Claims16
A method for forming a plurality of small, passivated, compact products from hot reactive particulate sponge iron comprising:
- a. feeding said particulate sponge iron at a temperature of at least 600.degree. C to a compacting apparatus;
- b. compacting said particulate sponge iron to form a continuous densified elongated metal strip,
- c. longitudinally cutting said densified elongated strip into a multiplicity of longitudinal strips;
- and
- d. further dividing said multiplicity of longitudinal strips at regular intervals by shearing them transversely to their longitudinal dimension and simultaneously densifying the newly created surfaces normal to the longitudinal dimension, thus producing a plurality of small compacted sponge iron products, each having a dense skin on all faces, whereby the products are resistant to atmospheric oxidation and suitable for bulk handling, storing, and shipping without additional passivating steps.
2 more elements
Dependencies are inferred from the claim text.