Process for preparing a smelter furnace charge composition
AssigneeMcDowell-Wellman Engineering Company
InventorThomas E. Ban
Life of this patent
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Abstract
There is provided an improved process for preparing a charge composition for a smelting furnace in accordance with which a deficiency of nonagglomerating carbonaceous material is utilized within pellets formed from iron oxide ore with or without an added flux material, and these pellets sintered on a traveling grate machine in the presence of externally supplied carbonaceous material in the sinter bed sufficient to make up the deficiency within the pellets.
Claims5
A process for the preparation of a complete self-reducing charge composition including prereduced metal pellets having a crushing strength of from about 40 to about 150 pounds comprising the step of prereducing on a traveling grate:
- a. green pellets comprising iron oxide, water, and a nonagglomerating carbonaceous material without any additional binder for binding the pellet during and after prereduction said nonagglomerating carbonaceous material supplying an amount of fixed carbon which is insufficient to reduce 100% of the iron oxide to metallic iron and is in the range of from 40% to 80% of that required to:
- 1. carburize the iron so produced;
- and
- 2. reduce all the iron oxide constituents to the metallic state;
- b. external corrective coarse carbonaceous material in an amount sufficient to supply the balance of the required amount of fixed carbon to:
- 1. carburize the iron so produced;
- and
- 2. reduce all the iron oxide constituents to the metallic state,
- said prereducing being at a temperature of at least 1800.degree. F to reduce at least a portion of the iron oxide to metallic iron, and said external carbonaceous material being physically blended with said green pellets.
A process for the preparation of a smelter furnace charge composition including prereduced metal pellets having a crushing strength in excess of 40 lbs. comprising the steps of:
- a. forming green moist pellets consisting essentially of granular iron oxide, water, and nonagglomerating carbonaceous material, said nonagglomerating carbonaceous material supplying an amount of fixed carbon which is insufficient to reduce 100% of the iron oxide to metallic iron and sufficient to provide a ratio to the reactable oxygen of from 0.2 to 0.7 in the fixed pellet;
- b. adding external carbonaceous material to said pellets as a burden to a traveling grate, said external carbonaceous material being in an amount sufficient to supply the balance of fixed carbon to:
- 1. reduce all the iron oxide constituents to metallic iron;
- 2. carburize the metallic iron;
- and
- c. sintering the charge at a temperature of from 1800.degree. to 2400.degree. F for a period of time to prereduce and remove at least 50% of the oxygen from the iron oxide.
A process for the preparation of a smelter furnace charge composition including prereduced metal pellets having a crushing strength in excess of 40 lbs. comprising the steps of:
- a. forming green moist pellets consisting essentially of granular iron oxide, water, nonagglomerating carbonaceous material, and flux material, said nonagglomerating carbonaceous material supplying an amount of fixed carbon which is insufficient to reduce 100% of the iron oxide to metallic iron and sufficient to provide a ratio to the reactable oxygen of from 0.2 to 0.7 in the fixed pellet;
- b. adding external carbonaceous material to said pellets as a burden to a traveling grate, said external carbonaceous material being in an amount sufficient to supply the balance of fixed carbon to:
- 1. reduce all the iron oxide constituents to metallic iron;
- 2. carburize the metallic iron;
- and
- c. sintering the charge at a temperature of from 1800.degree. to 2400.degree. F for a period of time to prereduce and remove at least 50% of the oxygen from the iron oxide.
Dependencies are inferred from the claim text.