Abstract:
A method and apparatus for tapping a metal refining furnace which is tiltable about a horizontal axis, including an externally mounted chamber or "hot spout" at the side of the furnace communicating with the interior of the furnace, a nozzle situated in the bottom wall of the chamber, stopper rod or sliding gate means associated with the chamber for closing the nozzle opening, and heating means in the chamber for maintaining a high temperature within the chamber. An associated receiving vessel is capable of monitoring the amount of molten metal in the vessel and generating a signal to stop the pouring operation.
Abstract:
Apparatus for the continuous making of steel in an electric steelmaking furnace, having a charge material preheater, continuous charging means, and means for removing refined steel without removing the furnace electrodes from operation, wherein charging and tapping are accomplished while maintaining full electric power, and allowing for good control over both product quality and product chemistry.
Abstract:
An apparatus and method for processing liquid slag and baghouse dust from a steelmaking furnace such as an EAF to recover valuable metals from the slag and dust includes a treatment vessel having a movable lower shell portion for receiving liquid slag and an upper shell portion that couples with the movable lower shell portion during heat activation of the treatment vessel. The slag is combined with silicon dioxide, a reducing agent, baghouse dust, and an inert gas before being heated to between approximately 1400° C. and 3000° C. The heat treatment results in a molten reduced iron and manganese metallic material, a treated slag layer, and an off-gas containing lead, zinc, and carbon monoxide. The off-gas is combusted, cooled, and solidified, resulting in lead oxide and zinc oxide. The slag layer is tapped, cooled, and solidified. The metallic layer is tapped for recycle in the steel making process.
Abstract:
A method and apparatus for improved control of continuous electric arc furnace steelmaking in which a charge velocity detector measures charge velocity of metallic charge introduced to the furnace. A charge mass detector measures a charge mass of metallic charge introduced to the furnace. A computer determines a feed rate based on the charge velocity and the charge mass. An automatic bath level probe detects a steel bath. The computer determines a steel bath level and optimal positions to insert a temperature probe and an oxygen lance, and further predicts new bath levels from one tapping time to the next tapping time. The temperature probe is inserted to an optimal measurement position based on the steel bath level and measures a steel bath temperature. The oxygen lance is positioned and maintained at an optimal oxygen injection position and injects oxygen into the bath.
Abstract:
An apparatus and method for charging a melting furnace having a charging opening in its sidewall, in which a closed housing contains a vibrating pan having an intergal discharge chute adapted to extend into the charging opening in the furnace sidewall; and a truck-mounted carriage for moving the charging apparatus into the charging opening of the furnace and removing the apparatus to a position remote therefrom. A method for feeding the furnace over a predefined area, and continuously feeding the furnace during all phrases of operation, including slagging and tapping, is also disclosed.
Abstract:
An improved method and apparatus for preheating, melting, refining and casting of steel. The apparatus has a variable length secondary belt conveyor positioned in a charging area for introducing minute charge materials or slag formers, a skirted self-positioning charging cart engaging the secondary conveyor, a charge conveyor for receiving charge material having a means for maintaining a homogeneous scrap bed height that is coupled to the self-positioning cart, a dynamic gas seal coupled to both the charge conveyor and a preheater, the preheater communicating with the charge conveyor for preheating the charge materials on the charge conveyor, a connecting car for feeding charge materials into a furnace bath that is removably coupled to the preheater and charge conveyor, an electric arc furnace for melting and refining metallic charge therein, at least one electrode sealing ring that is coupled to the electrodes of the furnace, a directly fed intermediate metallurgical vessel that receives the molten metal discharged from the furnace, and a continuous casting device that receives refined-alloyed steel from the intermediate metallurgical vessel. No ladle is used so that the furnace pours directly into the intermediate metallurgical vessel thereby eliminating the requirements for both a ladle and ladle handling equipment.
Abstract:
A method and apparatus for heat treating of hazardous waste by heating the waste in a pyrolyzing chamber and forming an off-gas, heating the off-gas for a sufficient time to destroy dioxins and furans, then reducing and cooling the off-gas in a secondary treating chamber having a graphite stack and recovering metallics by distillation.
Abstract:
A method and apparatus for reducing the production or emission of noxious gases while continuously preheating a mixture of iron-bearing scrap charge materials for an electric steelmaking furnace operation with off-gas from, the furnace, including provision for controlled combustion within the preheating chamber. Removed gases are then treated by thermal incineration of combustible residual matter before release into the atmosphere to insure that no noxious gases are emitted.
Abstract:
An apparatus and method for charging a melting furnace having a charging opening in its sidewall, in which a closed housing contains a pivotally mounted receiving pan having a discharge chute on one side thereof, the discharge chute adapted to extend into the charging opening in the furnace sidewall; and means for moving the charging apparatus into the charging opening of the furnace and removing the apparatus to a position remote therefrom. A method for feeding the furnace over a predefined area, and continuously feeding the furnace during all phases of operation, including slagging and tapping, is also disclosed.
Abstract:
An improved method and apparatus for charging, preheating and refining steel. The charging apparatus has a skirted charging section for introducing charge materials, a dynamic gas seal adjacent the charging section and a preheater, the preheater for preheating the charged materials, a connector adjacent the preheater and removably insertable into an electric arc furnace for feeding charged materials into a furnace bath for melting and refining metallic charge therein, and a vibrating conveyor which extends throughout the charging apparatus. The charging apparatus is positioned on rails to be movable by a hydraulic cylinder between a charging position wherein the connector is fully inserted into the furnace, a retracted position where the connector is partially inserted into the furnace and a disconnected position where the connector is fully removed from the furnace.