4-AMINO-6,7-DIMETHOXY-2(5-METHANESULFONAMIDO-1,2,3,4-TETRAHYDROISOQUINOL-2YL)-5-(2-PYRIDYL)QUIANAZOLINE MESYLAT AND POLYMORPHS

摘要

1. A method for reducing and removing a build-up forming on a grate of a fluidized bed furnace in the roasting of a fine-grained material such as concentrate, in which the material 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 and oxidize the material during fluidization, characterized in that at the feed point of the fine-grained material, the oxygen content of the gas fed is increased compared to the oxygen content of the gas fed to the rest of the grate wherein the number of gas nozzles at the feed grate is at least 5% bigger than the number of gas nozzles in the rest grate area or the cross section area of the gas nozzles at the feed grate is at least 5% larger than the cross section area of the gas nozzles in the rest of the grate. 2. A method according to claim 1, characterized in that the feed point of the concentrate i.e. feed grate, forms at least 5% of the total cross-sectional area of the grate. 3. A method according to claim 1, characterized in that the feed point of the concentrate i.e. feed grate, forms 10-15 % of the total cross-sectional area of the grate. 4. A method according to claim 1, characterized in that the number of gas nozzles at the feed grate is 10-20% bigger than the number of gas nozzles in the rest grate area. 5. A method according to claim 1, characterized in that the cross section area of the gas nozzles at the feed grate is 10-20 % larger than the cross section area of the gas nozzles in the rest of the grate. 6. A method according to claim 1, characterized in that a fluidizing gas is fed into the furnace via the feed grate with an oxygen content higher than the oxygen content of the fluidizing gas in the rest of the grate. 7. A method according to claim 6, characterized in that the material to be roasted is zinc concentrate. 8. A method according to claim 6, characterized in that the material to be roasted is iron containing sulfide concentrate.