A control method and apparatus for inhibiting slag entrapment in ladle (1) during continuous casting production. An optimal control model calculating unit (11) receives related signals and data sent by a ladle weight detector (4), a molten steel flow field detector (5), a slag detector (7), a sliding gate opening detector (9), and a process signal interface unit (10), performs calculation and analysis according to an optimal control model to obtain a corresponding optimal control strategy, and outputs the strategy to an electromagnetic brake (6) and a sliding gate controller (8) for slag entrapment inhibition control. Regarding the two processes where a vortex may be formed, by means of different optimal control strategies, which respectively inhibit or destroy the formation of a vortex, slag generation is postponed, and molten steel may flow out without bringing slag out, thereby reducing residual ladle steel and improving molten steel yield.

A telescoping thermal lance assembly including a housing with an oxygen inlet port. An extension tube disposed in the housing. The extension tube having a cylindrical interior cavity. The extension tube configured to slide at least partially out of the housing when pressurized oxygen is channeled into the inlet port. A cylindrical lance tube is located within the interior cavity of the extension tube and slides partially out of the extension tube when pressurized oxygen is channeled into the housing. A slice rod is located within the lance tube. A cap is attached to the top of the extension tube and spaced apart from the tip of the lance tube. A gas turbine assembly attached above the cap and including a turbine and a plurality of blades that rotationally drive the turbine, rotation of the turbine generating a spark in the igniter section.

A tap hole cleaning apparatus (20) for an electric arc furnace and a corresponding electric arc furnace (1) enable the cleaning of a tap hole (12) of an electric arc furnace (1) comprising a furnace vessel (2) having an eccentric or offset bottom tap hole (12). A lance head (24) is movable in a first step from a lower end position to an upper end position into and through the tap hole (12), and in a second step, the lance head (24) is movable back through the tap hole (12) from the upper end position to the lower end position while ejecting oxygen through one or more lateral oxygen ejection nozzles to clean the inner periphery of the tap hole (12).

A second-level liquid slag cache system with flow and temperature monitoring and control functions is disclosed. A slag inlet is located at an upper portion of the slag ladle casing; at least one slag discharging unit is located at a side of a lower portion of the slag ladle casing; one slag discharging unit is corresponding to one stopper; the stopper includes a stopper head, a stopper rod and a stopper control mechanism; the stopper control mechanism is configured to control the flow area between the stopper head and the sizing nozzle; a sealing cover is disposed outside the sizing nozzle; a slag control tube is installed at a bottom of the sealing cover. The present invention is able to achieve liquid slag buffer, flow control and heat compensation, so as to allow liquid slag to continuously stably perform a subsequent granulation process.

A second-level liquid slag cache system with flow and temperature monitoring and control functions is disclosed. A slag inlet is located at an upper portion of the slag ladle casing; at least one slag discharging unit is located at a side of a lower portion of the slag ladle casing; one slag discharging unit is corresponding to one stopper; the stopper includes a stopper head, a stopper rod and a stopper control mechanism; the stopper control mechanism is configured to control the flow area between the stopper head and the sizing nozzle; a sealing cover is disposed outside the sizing nozzle; a slag control tube is installed at a bottom of the sealing cover. The present invention is able to achieve liquid slag buffer, flow control and heat compensation, so as to allow liquid slag to continuously stably perform a subsequent granulation process.

Exemplary embodiments of mud gun caps are disclosed herein. An exemplary mud gun cap includes a flame-resistant body that has a tap hole contacting surface. The flame-resistant body has side wall; a first bore and a second bore located within the flame-resistant body. The first bore has a first diameter and second bore has a second diameter. The first diameter is smaller than the second diameter and the second bore is located farther away from the tap hole contacting surface than the first bore.

A melting furnace for metallurgical plant comprising a vessel provided with a bottom; a tapping duct passing through the bottom; rotation means to rotate the vessel so that the tapping duct passes from a first reference position to a second position inclined with respect to said first reference position, and vice versa; wherein said tapping duct has a first stretch arranged in the thickness of the bottom and completely passing through the bottom, and a second stretch, adjacent to the first stretch, protruding inside the vessel; wherein there is provided a cover of the second stretch shaped as a tube closed at an upper end thereof and open at a lower end thereof; said tube being coaxial and spaced from said second stretch, and being spaced from a zone of the bottom which includes the first stretch of the tapping duct, whereby the cover, in cooperation with the second stretch of the tapping duct, acts as a tapping hood.

Method for determining the state of a fire-resistant lining of a vessel containing molten metal in particular in which maintenance data, production data, and wall thicknesses at least at locations with the highest degree of wear are measured or ascertained together with additional process parameters of at least one identical/similar vessel after the vessel has been used. The data is collected and stored in a data structure. A calculating model is generated from at least some of the measured or ascertained data or parameters, and the data or parameters are evaluated using the calculating model using calculations and subsequent analyses. Thus, related or integral ascertaining processes and subsequent analyses can be carried out, on the basis of which optimizations relating to both the vessel lining as well as the complete process of the molten metal in the vessel are achieved.

The present invention relates to delivering sand to a metal melting furnace to fill a tap hole. The swiveling sander moves into position through a horizontal arcing movement. The Swiveling Sanding Systems comprises a swiveling sander with slag plunger. The Swiveling Sander swivels from a home position into a sanding position in order to add sand to a metal melting furnace at the same time as the slag plunger moves out of the way. After delivering sand, the swiveling sander swivels back to home position while the slag plunger also moves back to home position followed by the plunger clearing any slag.

A tap hole cleaning apparatus (20) for an electric arc furnace and a corresponding electric arc furnace (1) enable the cleaning of a tap hole (12) of an electric arc furnace (1) comprising a furnace vessel (2) having an eccentric or offset bottom tap hole (12). A lance head (24) is movable in a first step from a lower end position to an upper end position into and through the tap hole (12), and in a second step, the lance head (24) is movable back through the tap hole (12) from the upper end position to the lower end position while ejecting oxygen through one or more lateral oxygen ejection nozzles to clean the inner periphery of the tap hole (12).