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:
Feb. 18, 1986
Filed:
Jun. 25, 1984
Kurt J Buren, Skelleftehamn, SE;
Martin L Hedlund, Ursviken, SE;
Malkolm S Lundstrom, Skellefte.ang., SE;
Boliden Aktiebolag, Stockholm, SE;
Abstract
The invention relates to a method for recovering lead and lead-alloying elements from battery-type lead waste products, and fractions thereof, such as battery mud, and similar oxidic-sulphatic materials. In accordance with the method, the waste products, together with a solid reduction agent, are introduced to a furnace in which the contents thereof can be vigorously agitated. The amount of solid reduction agent charged is selected so as to ensure the chemical reduction of substantially all the non-metallic lead contained by the waste products, and the alloying elements present therein. The material charged to the furnace is heated to a temperature of between about 1050.degree. C. and 1250.degree. C., while vigorously agitating the furnace contents, so as to melt, split-off and chemically reduce the waste products, to form a lead melt containing the aforementioned alloying elements. The furnace used is preferably a top-blown rotary converter of the Kaldo type, in which the furnace contents can be agitated by rotating the furnace.