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| Number | Title | Issue Date |
| 7846379 | Industrial furnace The invention relates to an industrial furnace for melting and gas-treating nonferrous metals. ... | 12/07/2010 |
| 6135766 | Rotary hearth furnace and method of operating the same A feed stock composed of an iron ore and a solid reducing material is supplied in a movable hearth furnace provided with a unidirectionally movable hearth, stacked on the movable hearth and then subjected to a series of operations of preheating, reduction... | 10/24/2000 |
| 5320799 | Apparatus for continuous copper smelting There is disclosed an apparatus for smelting copper which includes a smelting furnace, a separating furnace, a converting furnace, and launders connecting these furnaces in series. In the smelting furnace, copper concentrate is melted and oxidized to prod... | 06/14/1994 |
| 4547220 | Reduction of MoO3 and ammonium molybdates by ammonia in a rotary furnace A method is disclosed for the intermediate reduction of a molybdenum compound selected from the group consisting of MoO3 and ammonium molybdate to MoO2. The molybdenum compound is fed to an indirectly fired inclined rotary calciner a... | 10/15/1985 |
| 4273314 | Direct reduction rotary kiln with improved air injection In the direct reduction process for reducing iron ore to sponge iron of the type disclosed in U.S. Pat. No. 3,890,138 to Hockin wherein all of the air supply tubes along the rotary kiln inject air toward the discharge end of the kiln it has been found tha... | 06/16/1981 |
| 4245821 | Refining furnace for nonferrous metal A furnace for the refining of nonferrous metal such as copper comprising a drum structure rotatable about a substantially horizontal axis and formed along the same side of the shell with a tapping box for discharging the molten metal and a slag-dischargin... | 01/20/1981 |
| 4226588 | Smelting furnace A smelting furnace for metal such as aluminum or aluminum-base alloy having a relatively low melting point comprising a rotatable lower furnace body having an upper opening and an upper furnace body secured to a frame and having a lower opening for coveri... | 10/07/1980 |
| 4032121 | Process for the production of iron from iron ores and apparatus for carrying out said process A process and apparatus for the production of iron from iron ores, in which the ore is being heated and reduced in a rotary kiln by a treatment with solid carbon and with flame gas flowing in a countercurrent, the reduced iron is being collected and overh... | 06/28/1977 |
| 3991987 | Rotary kiln and hearth furnace A joint between a rotary kiln and a tiltable hearth furnace, characterized in that a part of the hearth furnace embraces the discharge end of the rotary kiln and the pivotal axis of the hearth furnace coincides with the axis of rotation of the rotary kiln... | 11/16/1976 |
