With respect to an unprecedented process of preparation of inorganic fluorescent markers under the action of infrared light, for identification and marking, by a specific insertion process, in explosives, fuses, ammunition after detonation, as well as the identification and marking of steel and metal alloys of firearms and metal projectiles an improvement includes the physical insertion of the markers in the channel and in the crucible of the pig iron production process; in this improved process, marking was carried out in the ratio of 1 part of the marker to 1,325,750 parts per mass of pig iron.

With respect to an unprecedented process of preparation of inorganic fluorescent markers under the action of infrared light, for identification and marking, by a specific insertion process, in explosives, fuses, ammunition after detonation, as well as the identification and marking of steel and metal alloys of firearms and metal projectiles an improvement includes the physical insertion of the markers in the channel and in the crucible of the pig iron production process; in this improved process, marking was carried out in the ratio of 1 part of the marker to 1,325,750 parts per mass of pig iron.

A method for iron making by continuous smelting reduction, including: (1) mixing iron-containing mineral powder with a reducing agent and a slag former to obtain mixed powder materials; (2) placing furnace startup materials in a reducing furnace, and heating the furnace startup materials to be in a molten state to form a furnace startup molten pool; (3) conveying the mixed powder materials into the reducing furnace, and blowing oxidizing combustibles into the reducing furnace for heating; (4) performing stirring by a stirring paddle to form a molten slag layer and a molten iron layer; and performing stirring so that a vortex is formed in the molten slag layer; and (5) adjusting a position of the stirring paddle, a stirring speed and a conveying quantity of the mixed powder materials to enable the molten iron and the reduced molten slag to be respectively continuously discharged.

A method for iron making by continuous smelting reduction, including: (1) mixing iron-containing mineral powder with a reducing agent and a slag former to obtain mixed powder materials; (2) placing furnace startup materials in a reducing furnace, and heating the furnace startup materials to be in a molten state to form a furnace startup molten pool; (3) conveying the mixed powder materials into the reducing furnace, and blowing oxidizing combustibles into the reducing furnace for heating; (4) performing stirring by a stirring paddle to form a molten slag layer and a molten iron layer; and performing stirring so that a vortex is formed in the molten slag layer; and (5) adjusting a position of the stirring paddle, a stirring speed and a conveying quantity of the mixed powder materials to enable the molten iron and the reduced molten slag to be respectively continuously discharged.

A method for manufacturing pig iron in an electrical smelting furnace including a vessel, the method including the following successive steps: loading DRI product in the vessel melting the DRI product to form a pig iron layer topped by a slag layer and tapping the pig iron into a ladle and adding a silicon containing material directly in the pig iron in the runner of at least one of the smelting furnace tap holes. It also deals with the manufacturing of steel from the pig iron and an associated electrical smelting furnace.

A method for manufacturing pig iron in an electrical smelting furnace including a vessel, the method including the following successive steps: loading DRI product in the vessel melting the DRI product to form a pig iron layer topped by a slag layer and tapping the pig iron into a ladle and adding a silicon containing material directly in the pig iron in the runner of at least one of the smelting furnace tap holes. It also deals with the manufacturing of steel from the pig iron and an associated electrical smelting furnace.

A method for manufacturing pig iron in an electrical smelting furnace including a vessel, the method including the following successive steps: loading DRI product in the vessel, melting the DRI product to form a pig iron layer topped by a slag layer and, tapping the pig iron into a ladle, and adding a carbon containing material directly in the pig iron in the runner of at least one of the smelting furnace tap holes. It also deals with the manufacturing of steel from the pig iron and the associated electrical smelting furnace.

A method for manufacturing pig iron in an electrical smelting furnace including a vessel, the method including the following successive steps: loading DRI product in the vessel, melting the DRI product to form a pig iron layer topped by a slag layer and, tapping the pig iron into a ladle, and adding a carbon containing material directly in the pig iron in the runner of at least one of the smelting furnace tap holes. It also deals with the manufacturing of steel from the pig iron and the associated electrical smelting furnace.

A method for producing pig iron using a blast furnace including a tuyere, the method including charging a first layer containing an iron ore material and a second layer containing coke alternately in the blast furnace and reducing and melting the iron ore material in the first layer while injecting an auxiliary reductant into the blast furnace by hot air blown from the tuyere. The iron ore material contains a reduced iron molded product obtained by compression molding of reduced iron, the auxiliary reductant contains pulverized coal, a blending amount of the reduced iron is greater than or equal to 200 kg per ton of pig iron to be produced, a reducing agent ratio of a reducing agent containing the coke and the pulverized coal is less than or equal to 440 kg/tp, and a pulverized coal ratio is greater than or equal to 130 kg/tp.