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:
May. 16, 2006
Filed:
Nov. 13, 2001
Pekka Taskinen, Pori, FI;
Maija-leena Metsärinta, Vanha-Ulvila, FI;
Juha Järvi, Vanha-Ulvila, FI;
Jens Nyberg, Kokkola, FI;
Heikki Siirilä, Kokkola, FI;
Pekka Taskinen, Pori, FI;
Maija-Leena Metsärinta, Vanha-Ulvila, FI;
Juha Järvi, Vanha-Ulvila, FI;
Jens Nyberg, Kokkola, FI;
Heikki Siirilä, Kokkola, FI;
Outokumpu Technology Oy, Espoo, FI;
Abstract
The present invention relates to method, which helps to reduce and remove the build-up forming on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster from the wall of the furnace, and oxygen-containing gas is fed via gas nozzles under the grate in the bottom of the furnace in order to fluidize the concentrate and oxidize it during fluidization. Below the concentrate feed point, or feed grate, the oxygen content of the gas to be fed is raised compared with the oxygen content of the gas fed elsewhere.