Bethlehem Steel Corporation

Colvin W Smith

John D Lynn

Glenn C Keyser

Richard V Fekete

Marvin S Stern

A slag conditioner for extending the life of a BOF vessel lining utilizing recycled blast furnace filter cake dewatered by contact with a hot slag; its process of production, and method of use.

Steelmaking slag conditioner and method

Specific recycle materials are blended with hot slag and wet sludge to make a recyclable steelmaking revert. The specific recycle materials are kish, lime, glass, ferro-manganese and the like. The specific materials are blended with the slag and sludge individually or in any desirable combination to form a steelmaking revert. After the recycle materials are blended with the slag and sludge, the recycle blend slag/sludge mixture is allowed to rest to bring the moisture content to less than 10% by weight. The steelmaking revert and process for making the same reduce the need for steelmaking raw materials by employing recycle materials from land fills. Thus, the cost of steel production is reduced.

Steel making revert and process for preparing

A method is provided for improving the efficiency of a basic oxygen furnace operation and/or regulating its rate of molten iron consumption to accommodate interruptions in downstream production. The method comprises the steps of combining a wet scrubber sludge with hot slag to provide a slag/sludge mixture, commencing a steelmaking operation of the basic oxygen furnace (BOF), and introducing the slag/sludge mixture into the BOF during the steelmaking operation so that the BOF produces a desired quantity and quality of steel in a manner that is more efficient than without the slag/sludge mixture. Also provided is a system for improving the efficiency of a BOF operation. The system comprises a mixer and an introduction mechanism. The mixer is connected to a source of wet scrubber sludge and a source of hot slag. The mixer is adapted to combine the wet scrubber sludge with the hot slag to provide a slag/sludge mixture. The introduction mechanism is adapted to transport the slag/sludge mixture from the mixer to a BOF and is adapted to introduce the slag/sludge mixture into the BOF during a steelmaking operation of the BOF. The mixer and introduction mechanism are operable in conjunction with the BOF so that the BOF produces a desired quantity and quality of steel in a manner that is more efficient than without the slag/sludge mixture. Improvements in efficiency include reduced heat cycle times, reduced oxygen blow times, reduced demand for raw materials outside of the slag/sludge mixture, reduced disposal and transportation costs, and increased productivity.

Method and system for improving the efficiency of a basic oxygen furnace

The invention is directed to a process for agglomerating high-carbon dust, such as kish. The process comprises the steps of providing a supply of the high-carbon dust, applying a suifactant and water to the high-carbon dust, and applying a bonding agent to the high-carbon dust so that the high-carbon dust becomes agglomerated. The process provides a product having favorable characteristics. A substantially non-dusting high-carbon composition, for example, can be provided. The high-carbon composition comprises high-carbon dust, a surfactant, and a bonding agent in an amount by weight between about {fraction (1/20,000)} and about {fraction (1/200)} of the weight of the high-carbon dust. The high-carbon dust, surfactant, and bonding agent are agglomerated to form a clay-like material. A kish agglomerating system also is provided. The system comprises a kish storage container, a mixing tank, and a transport mechanism. The mixing tank has an agitator adapted to mix kish, surfactant and bonding agent so that the kish, surfactant and bonding agent become agglomerated. Also provided is a kish collection and treatment vessel. The vessel comprises a wall structure, a closure device, and a treatment applicator. The wall structure defines outer boundaries of a kish collection cavity. The treatment applicator has an inlet outside of the kish collection cavity and at least one outlet in communication with the kish collection cavity to permit treatment of any kish in the kish collection cavity even when the closure device is in the closed position.

Process of agglomerating high carbon dusts and a substantially non-dusting high carbon composition therefrom

The invention is directed to a process for dehydrating and recycling back into a BOF converter wet BOF scrubber sludge to produce a steelmaking revert having an improved flow rate when handled in a recycle stream. Wet sludge is combined with hot BOF slag to provide a slag/sludge mixture. The wet sludge causes the mixture to have a moisture content greater than 10% water by weight, and the hot slag, having a temperature below the molten liquid state, vaporizes the water in the mixture and reduces the moisture content to about 4% water by weight or less. The dehydrated mixture has improved flow rate properties when it is recycled as a steelmaking revert.

Method of recycling iron-bearing waste material back into a basic oxygen

Revert manufactured from iron-bearing waste material

The invention is directed to a process for dehydrating wet BOF scrubber sludge to produce a steelmaking revert having an improved flow rate when handled in a recycle stream. Wet sludge is combined with hot BOF slag to provide a slag/sludge mixture. The wet sludge causes the mixture to have a moisture content greater than 10% water by weight, and the hot slag, having a temperature below the molten liquid state, vaporizes the water in the mixture and reduces the moisture content to about 4% water by weight or less. The dehydrated mixture has improved flow rate properties when it is recycled as a steelmaking revert.

Method for recycling iron bearing sludges in a steelmaking operation

A method for retaining slag in a ladle or similar vessel containing molten metal such as used in the steel industry. Lumps of a highly refractory material having a density between the density of the molten metal and the density of the slag are added to the vessel. As the molten metal is drained from the vessel, the lumps agglomerate around the drain orifice and block the discharge of the slag from the vessel.

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Caton, MD, United States of America

Colvin W Smith