The present invention relates to a process and to a system for eliminating the expandability of steel-plant slag, which comprises a primary crusher (3) to reduce the fragments according to their granulometry; a magnetic separator (4) to remove metallic fragments bigger than a determined granulometry (5); a rotary dryer (6) to dry slag free from bigger metallic fragments; an impact mill (11) to disaggregate and fragment slag particles that are bigger than a predetermined granulometry; a classifier (12) for aero-classification and drag of fine and superfine particles; a cooler (17) for cooling slag particles bigger than a predetermined granulometry by means of heat exchange and removal of the fine and superfine particles that were not collected by the impact mill (11); a vibrating sieve (21) provided with two or more decks (23, 24, and 25) with screens of predetermined sizes; low-intensity magnetic separators (26, 27 and 28), with generation of non-magnetic slag fractions free from metallic iron and from iron monoxide, and of magnetic fractions composed by metallic iron and iron monoxide; and low-intensity magnetic separators (35, 36 and 37) to reprocess the magnetic fractions with generation of concentrate with high metallic iron contents and a product with high concentration of iron monoxide.

Method for the production of metal products starting from ferrous material, by means of an electric arc furnace.

An example embodiment of the present invention provides a system for preheating ferromagnetic scrap. The system can include a preheating unit that is configured to hold ferromagnetic scrap and to receive hot gases. The preheating unit may include a removable cover that can include an electrical magnet system. The electrical magnet system can comprise an electrical magnet, a lifting device configured to lower and raise the electrical magnet, a power system configured to provide electrical power to the electrical magnet, and an electrical control system configured to operate the magnet. A hot gases cleaning system may be fluidly connected to the preheating unit.

The present invention discloses a scrap steel preheating type electric arc furnace and a method for improving a heating cold region of a side wall charging electric arc furnace. This invention includes an electric arc furnace body and an inclined scrap steel preheating chamber. An included angle between the inclined scrap steel preheating chamber and a horizontal plane is 30 to 65. Flue gas enters the inclined scrap steel preheating chamber, penetrates through the material blocking tooth rake and the scrap steel and is sucked out. The preheated scrap steel slides to a center of the electric arc furnace body along a slot bottom of the inclined scrap steel preheating chamber. The present invention overcomes a problem of lateral stacking of the side wall charging electric arc furnace, reducing impact force of the scrap steel to the device and greatly enhancing reliability of the device.

A method for recycling used cells such as saline cells, alkaline cells, button cells and used rechargeable batteries, includes the step of introducing the cells and/or rechargeable batteries as feedstock into a metal melting furnace, at the charging door thereof. The cells and/or rechargeable batteries are subjected to a compression operation in order to remove the electrolytes contained in the cells and/or rechargeable batteries, prior to introducing the cells and/or rechargeable batteries into the metal melting furnace.

The method can be used for recycling used cells and rechargeable batteries.

A process and system having a primary crusher to reduce the fragments according to their granulometry; a magnetic separator to remove metallic fragments bigger than a determined granulometry; a rotary dryer to dry slag; an impact mill to disaggregate and fragment slag particles; a classifier for aero-classification and drag of fine and superfine particles; a cooler for cooling slag by means of heat exchange and removal of the fine and superfine particles that were not collected by the impact mill a vibrating sieve provided with two or more decks with screens of predetermined sizes; low-intensity magnetic separators, with generation of non-magnetic slag fractions free from metallic iron and from iron monoxide, and of magnetic fractions composed by metallic iron and iron monoxide; and low-intensity magnetic separators to reprocess the magnetic fractions with generation of concentrate with high metallic iron contents and a product with high concentration of iron monoxide.

Solid agglomerated product, such as a briquette (B), which can be used as charge material for an electric arc furnace, comprising at least one by-product fraction (M; M1, M2, M3) deriving from a steel plant and comprising a first part containing ferrous oxide FeO and a second part containing ferric oxide Fe.sub.2O.sub.3, a solid fuel fraction (CR) containing a quantity of carbon (C_fix) and at least one inorganic binder to agglomerate a by-product fraction (M; M1, M2, M3) and the solid fuel fraction (CR) together and give the required mechanical properties to the agglomerate.

A scrap steel preheating type electric arc furnace and a method for improving a heating cold region of a side wall charging electric arc furnace are provided. The scrap steel preheating type electric arc furnace includes an electric arc furnace body and an inclined scrap steel preheating chamber. An included angle between the scrap steel preheating chamber and a horizontal plane is 30? to 65?. The scrap steel preheating chamber is connected with the electric arc furnace body. A dust removal pipe chamber is at an upper end. A material blocking tooth rake is on the scrap steel preheating chamber. A driving mechanism is below the material blocking tooth rake. Flue gas enters the scrap steel preheating chamber, penetrates through the material blocking tooth rake and the scrap steel and is sucked out by the dust removal pipe chamber. The scrap steel is preheated; then, the material blocking tooth rake is opened; and the preheated scrap steel slides to a center of the electric arc furnace body along a slot bottom of the inclined scrap steel preheating chamber. A falling angle of the scrap steel is changed through a method of matching the scrap steel preheating chamber with a large inclined angle and the material blocking tooth rake, thereby overcoming a problem of lateral stacking of the side wall charging electric arc furnace, reducing impact force of the scrap steel to the device and greatly enhancing reliability of the device.

An example embodiment of the present invention provides a system for preheating ferromagnetic scrap. The system can include a preheating unit that is configured to hold ferromagnetic scrap and to receive hot gases. The preheating unit may include a removable cover that can include an electrical magnet system. The electrical magnet system can comprise an electrical magnet, a lifting device configured to lower and raise the electrical magnet, a power system configured to provide electrical power to the electrical magnet, and an electrical control system configured to operate the magnet. A hot gases cleaning system may be fluidly connected to the preheating unit.

A metallurgical melting vessel has a vertical shaft, surrounded by a housing wall, which receives steel scrap. At least one closure element, having laterally spaced-apart fingers extending parallel to one another, is mounted such that it can move between a closed position and an open position. In the closed position, the fingers protrude at least partially into the shaft for the purpose of holding back steel scrap. In the open position, the fingers free the shaft at least to such an extent that the steel scrap can fall from the shaft into the melting vessel. The at least one closure element is mounted so as to be movable from the side of the shaft into the shaft and laterally thereoutof.