Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1996-02-21
1997-09-16
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75420, 75570, 75724, 75961, C22B 314
Patent
active
056675550
ABSTRACT:
A method for the removal of calcium byproducts created during the production of an iron-based feedstock suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by treating the waste stream with an ammonium chloride leaching solution, treating the leachant with a soluble ammonium salt in which the negative ion will form an insoluble compound with calcium, and separating the undissolved precipitates comprising iron compounds and calcium compounds from the leachant solution. The undissolved precipitants may be treated further by elevated temperature roasting, resulting in the iron-based feedstocks.
REFERENCES:
patent: 5464596 (1995-11-01), Myerson
Burrows Charles A.
DiBella Paul R.
Myerson Allan S.
Sanzenbacher Charles W.
Andrews Melvyn
Metals Recycling Technologies Corp.
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