The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1997
Filed:
Feb. 21, 1996
Allan S Myerson, Brooklyn, NY (US);
Charles A Burrows, Atlanta, GA (US);
Charles W Sanzenbacher, Charlotte, NC (US);
Paul R DiBella, Ball Ground, GA (US);
Metals Recycling Technologies Corp., Atlanta, GA (US);
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.