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:
Aug. 09, 2005
Filed:
Nov. 13, 2001
Pekka Taskinen, Pori, FI;
Maija-leena Metsärinta, Vanha-Ulvila, FI;
Jens Nyberg, Kokkola, FI;
Aija Rytioja, Kokkola, FI;
Pekka Taskinen, Pori, FI;
Maija-Leena Metsärinta, Vanha-Ulvila, FI;
Jens Nyberg, Kokkola, FI;
Aija Rytioja, Kokkola, FI;
Outokumpu Oyj, Espoo, FI;
Abstract
This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed and the roasting gas, which causes the fluidizing, is fed into the bottom of the furnace through a grate. In this method, the total amount of oxygen in the roasting gas to be fed and the average total oxygen requirement of the material to be roasted are calculated and the ratio between them regulated so that the oxygen coefficient in the bed is over 1.