A method for distributing iron-containing materials in an energy-saving iron ditch

Abstract

The present invention relates to the technical field of ironmaking, and specifically discloses an energy-saving method for distributing iron-containing materials in a molten iron ditch, comprising the following steps: 1) placing pellets made of iron-containing dust or light and thin scrap steel materials in a storage tank; 2) the pellets or light and thin scrap steel materials at the bottom of the storage tank leave the storage tank and fall onto a conveyor belt driven by a discharging device; 3) as the conveyor belt rotates, the pellets or light and thin scrap steel materials are evenly distributed on the surface of flowing molten iron in the molten iron ditch; the present invention utilizes the principle that the density of iron-containing dust pellets and light and thin scrap steel materials is much lower than that of molten iron, and evenly distributes the iron-containing dust pellets or light and thin scrap steel materials on the surface of the molten iron according to the flow rate of the molten iron, thereby playing the role of heat preservation of the molten iron and reducing the thermal radiation of the molten iron, thereby achieving the purpose of energy saving and consumption reduction, and at the same time avoiding the disadvantage that the temperature drop of the molten iron is too large and cannot meet the requirements of steelmaking production due to the artificial throwing of iron-containing dust pellets and light and thin scrap steel materials into the molten iron ditch.

Description

Technical Field

[0001] The invention relates to the technical field of ironmaking, and in particular to a method for distributing iron-containing materials in an energy-saving iron ditch. Background Art

[0002] Iron-containing dust sludge generated by steel mills is generally pretreated to return to the sintering feed after high-toxic element content. Scrap with low toxic element content and a high TFe content (>50%) can be directly returned to the sintering feed or pressed into pellets for use as a steelmaking coolant. Currently, pelletizing iron-containing dust sludge is the most economical method for use as a steelmaking coolant, but the steelmaking process cannot consume such a large amount of iron-containing dust. The remaining iron-containing dust sludge that meets the requirements must be returned to the sintering feed. Light and thin scrap steel is pressed into briquettes and used as a raw material for steelmaking. However, due to its low density and tendency to carry impurities, it is not favored by steelmakers.

[0003] As steelmakers continue to pursue energy conservation and consumption reduction in their processes, some have proposed spreading pellets or light scrap material made from iron-containing dust and sludge with low harmful elements and high TFe content (>50%) into the molten iron trough during blast furnace tapping. This proposal has been implemented in some steel mills. The benefits of this approach include: 1) increased molten iron output; 2) reduced fuel consumption; and 3) the need for compaction of the light scrap material. In existing steel mills, workers simply toss pellets or light scrap material into the trough in proportion to the molten iron. This results in a significant drop in molten iron temperature, which in turn impacts the normal operation of subsequent steelmaking processes. Therefore, it is necessary to develop a method for distributing ferrous material into the trough that is rationally designed, uniformly distributed, and more energy-efficient, in order to minimize the temperature drop of molten iron. Summary of the Invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide an energy-saving method for distributing iron-containing materials in iron troughs.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for distributing iron-containing materials in an energy-saving iron ditch, comprising the following steps:

[0006] 1) Place pellets made from iron-containing dust or thin scrap steel into a storage tank;

[0007] 2) The pellets or thin scrap steel at the bottom of the storage tank leave the storage tank and fall onto the conveyor belt driven by the discharge device;

[0008] 3) As the conveyor belt rotates, the pellets or thin scrap steel are evenly distributed on the surface of the flowing molten iron in the molten iron ditch.

[0009] Specifically, the size of the light and thin scrap steel in step 1) is the same as the size of the iron-containing dust pellets.

[0010] Specifically, the conveying track in step 2) is an alloy steel track that can withstand temperatures of 1600°C.

[0011] Specifically, the position of the conveying belt close to the molten iron in step 2) is parallel to the molten iron surface, and the rotation speed of the conveying belt is the same as the flow rate of the molten iron.

[0012] Specifically, the density of the pellets or light scrap steel in step 3) is much lower than that of molten iron. When the pellets or light scrap steel are spread on the molten iron, they are evenly suspended on the surface of the molten iron, adding a thermal insulation layer to the upper surface of the molten iron.

[0013] The present invention has the following beneficial effects:

[0014] The energy-saving method of distributing iron-containing materials in the molten iron ditch designed by the present invention utilizes the principle that the density of iron-containing dust and mud pellets and light and thin scrap steel materials is much lower than the density of molten iron. The iron-containing dust and mud pellets or light and thin scrap steel materials are evenly distributed on the surface of the molten iron according to the flow rate of the molten iron, which plays a role in keeping the molten iron warm and reducing the thermal radiation of the molten iron, thereby achieving the purpose of energy saving and consumption reduction. At the same time, it avoids the disadvantage that the temperature drop of the molten iron is too large and cannot meet the requirements of steelmaking production due to the artificial throwing of iron-containing dust and mud pellets and light and thin scrap steel materials into the molten iron ditch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a process flow chart of an energy-saving method for distributing iron-containing materials in iron troughs. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] like Figure 1 As shown, a method for distributing iron-containing materials in an energy-saving iron ditch comprises the following steps:

[0018] 1. Place the pellets made of iron-containing dust or thin scrap steel in a storage tank. To facilitate unloading, it is recommended that the size of the thin scrap steel be similar to that of the iron-containing dust pellets.

[0019] 2. The pellets or light scrap steel at the bottom of the storage tank leave the storage tank and fall onto the conveyor belt driven by the discharging device. The conveyor belt is an alloy steel belt that can withstand 1600℃. The position of the conveyor belt close to the molten iron is parallel to the molten iron surface, and the rotation speed of the conveyor belt is the same as the flow rate of the molten iron.

[0020] 3. As the conveyor belt rotates, pellets or light scrap steel materials are evenly distributed on the surface of the flowing molten iron in the molten iron groove. Because the density of pellets and light scrap steel materials is much lower than that of molten iron, pellets or light scrap steel materials are evenly suspended on the surface of the molten iron when they are distributed on the molten iron, adding a layer of insulation to the surface of the molten iron, which plays a role in reducing the heat radiation of the molten iron, thereby achieving the purpose of energy saving and consumption reduction.

[0021] Example 1:

[0022] The temperature of the molten iron upon arrival in the converter is required to be no less than 1250°C. Without iron-containing dust pellets, the molten iron has a discharge temperature of 1540°C and a converter temperature of 1270°C. If 10kg of iron-containing dust pellets are added to 1 ton of molten iron and manually added to the molten iron ditch, the discharge temperature is 1540°C and the converter temperature is 1240°C. Using the method provided by the present invention, the discharge temperature is 1540°C and the converter temperature is 1260°C.

[0023] Example 2:

[0024] The temperature of the molten iron upon arrival at the converter is required to be no less than 1250°C. Without the addition of light scrap, the molten iron reaches a temperature of 1540°C out of the furnace and 1270°C in the converter. If 10kg of light scrap is added to 1 ton of molten iron and manually added to the molten iron ditch, the temperature at the exit of the furnace is 1540°C and the temperature at the converter is 1235°C. Using the method provided by the present invention, the temperature at the exit of the furnace is 1540°C and the temperature at the converter is 1255°C.

[0025] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

[0026] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A method for distributing iron-containing materials in an energy-saving iron ditch, characterized in that: The following steps are involved: 1) Place pellets made from iron-containing dust or thin scrap steel into a storage tank; 2) The pellets or light scrap steel at the bottom of the storage tank are driven by the discharge device to leave the storage tank and fall onto the conveyor belt. The conveyor belt is made of alloy steel that can withstand 1600℃. The position of the conveyor belt close to the molten iron is parallel to the molten iron surface, and the rotation speed of the conveyor belt is the same as the flow rate of the molten iron. 3) As the conveyor belt rotates, the pellets or thin scrap steel are evenly distributed on the surface of the flowing molten iron in the molten iron ditch.

2. The method for distributing iron-containing materials in an energy-saving iron ditch according to claim 1, characterized in that: The size of the light and thin scrap steel in step 1) is the same as the size of the iron-containing dust pellets.

3. The method for distributing iron-containing materials in an energy-saving iron ditch according to claim 1, characterized in that: The density of the pellets or light scrap steel in step 3) is much lower than that of molten iron. When the pellets or light scrap steel are spread on the molten iron, they are evenly suspended on the surface of the molten iron, adding a thermal insulation layer to the upper surface of the molten iron.

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