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:
Apr. 23, 1985
Filed:
Apr. 30, 1984
Johan S Leirnes, Skelleftehamn, SE;
Malkolm S Lundstrom, Skellefte.ang., SE;
Martin L Hedlund, Ursviken, SE;
Kurt J Buren, Skelleftehamn, SE;
Boliden Aktiebolag, Stockholm, SE;
Abstract
The invention relates to a method for producing lead from moist lead-sulphide concentrates and oxidic and/or sulphatic lead raw materials by the known roasting and reaction process. According to the method granules or pellets of oxidic and/or sulphatic lead raw materials are brought together with the moist lead concentrate in a drum-like vessel arranged for rotation about its longitudinal axis. Said moist concentrate is dried while rotating said drum-like vessel to form sulphide-containing granulates. The formed granulates are introduced into a furnace together with flux in given proportions. The charge is vigorously agitated and turbulence created in the resultant melt, while effecting the roasting and reaction process to form a liquid slag and a molten lead phase. Both the drying and the smelting may be provided in the same unit if a top-blown rotary converter is employed.