CN215887083U - Blast furnace for producing manganese-rich slag by coal injection method - Google Patents
Blast furnace for producing manganese-rich slag by coal injection method Download PDFInfo
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- CN215887083U CN215887083U CN202122367592.9U CN202122367592U CN215887083U CN 215887083 U CN215887083 U CN 215887083U CN 202122367592 U CN202122367592 U CN 202122367592U CN 215887083 U CN215887083 U CN 215887083U
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Abstract
The utility model discloses a blast furnace for producing manganese-rich slag by a coal injection method, and belongs to the technical field of blast furnace metallurgy. The blast furnace for producing the manganese-rich slag by the coal injection method comprises a blast furnace body and a coal injection assembly, wherein a plurality of hot air branch pipes are arranged at the furnace belly of the hot air branch pipe blast furnace body, and the feeding ends of the hot air branch pipes are connected with a hot air main pipe. The hot air branch pipe coal injection assembly comprises a plurality of coal injection guns, and the outlet ends of the hot air branch pipe coal injection guns are arranged in the hot air branch pipe of the hot air branch pipe and are close to the pipe orifice of the hot air branch pipe. During smelting, hot air is introduced into the blast furnace body of the hot air branch pipe, and simultaneously, coal powder is sprayed, and the coal powder is quickly oxidized and releases heat under high-temperature and low-oxygen environments and is used as a reducing agent and a heat source medium to replace part of coke, so that the addition amount of initial coke is reduced. Practice shows that the coal powder can replace 900kg coke of 800-.
Description
Technical Field
The utility model belongs to the technical field of blast furnace metallurgy, and particularly relates to a blast furnace for producing manganese-rich slag by a coal injection method.
Background
Manganese plays an important role in national economic development, manganese ores in China mostly belong to poor ores, and common manganese ore dressing methods are mechanical dressing, pyrogenic process enrichment, chemical ore dressing and the like. The pyrogenic process enrichment method of manganese ore is a separation method for treating refractory poor manganese ore with high phosphorus and high iron, and is also called as manganese-rich slag method. The high-temperature separation method is a high-temperature separation method which utilizes the different reduction temperatures of manganese, phosphorus and iron and controls the temperatures in a blast furnace or an electric furnace to carry out selective separation. The method has simple process and stable production, and can effectively separate iron and phosphorus in the ore to obtain manganese-rich, low-iron and low-phosphorus manganese-rich slag.
The blast furnace production of manganese-rich slag is one of the main production modes of manganese-rich slag, and in the prior art, for example, the Chinese invention patent with the patent number of 201410308539.3 discloses a smelting process of low-sulfur low-manganese high-iron manganese-rich slag, and the attached drawing of the specification specifically discloses an equipment flow chart of the process: the manganese-rich slag is obtained by feeding manganese-poor ores and cokes from the top of a blast furnace, forming a hot air inlet at the belly of the blast furnace, forming an iron discharge port and a slag discharge port at the hearth, controlling the furnace temperature to 1250-1350 ℃, performing selective reduction reaction in the furnace, and collecting slag at the upper part of the hearth. Firstly, coke is used as a reducing agent and a heat source, a large amount of coke is consumed, and the production cost is high. Secondly, the strength of the manganese ore and the sintered ore entering the furnace is poor, the air permeability and the liquid permeability in the furnace are poor, the root of a soft melting zone moves upwards, the thermal stability of the furnace slag is poor, and the furnace wall is easy to be thickened and nodulated when the furnace condition is difficult to operate, so that the coke ratio of production is increased, the yield is reduced, and the cost is increased.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a blast furnace for producing manganese-rich slag by a coal injection method, so as to solve the technical problems of large coke consumption and high production cost in the manganese-rich slag production process in the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a coal injection method production is blast furnace for rich manganese sediment, includes the blast furnace body, the furnace belly punishment of blast furnace body is laid and is provided with a plurality of hot-blast branch pipes, hot-blast main pipe is connected to the feed end of hot-blast branch pipe, still includes the coal injection subassembly, the coal injection subassembly includes a plurality of coal injection guns, the exit end setting of coal injection gun is in the hot-blast branch pipe, and be close to the mouth of pipe department of hot-blast branch pipe.
As a further description of the above technical solution: the outlet end of the coal injection gun is coaxial with the hot air branch pipe.
As a further description of the above technical solution: the coal injection assembly further comprises a coal powder conveying mechanism, and the discharge end of the coal powder conveying mechanism is connected with the feed end of the coal injection gun and used for conveying coal powder to the coal injection gun.
As a further description of the above technical solution: the pulverized coal conveying mechanism comprises a pulverized coal tank and an injection tank, wherein an inlet of the injection tank is connected with the outlet end of the pulverized coal tank, an outlet of the injection tank is connected with a coal conveying pipe, a pulverized coal splitter is arranged on the coal conveying pipe, and a gas phase inlet of the injection tank is connected with a nitrogen feeding pipe fitting.
As a further description of the above technical solution: the top of blast furnace body is provided with the feeding distributor, the entry end of feeding distributor is provided with the feeding lifting machine, the entry end of feeding lifting machine is provided with the blending hopper, the top of blending hopper is provided with poor manganese ore feed bin, coke feed bin and carborundum sediment feed bin.
As a further description of the above technical solution: a taphole is arranged at the bottom of a hearth of the blast furnace body, a first air nozzle is arranged above the taphole, and the first air nozzle is over against the taphole; the inlet end of the first air nozzle is connected with the hot air main pipe.
As a further description of the above technical solution: and a slag hole is also formed in the hearth of the blast furnace body, and the height of the slag hole is higher than that of the tap hole.
As a further description of the above technical solution: and a second air nozzle is arranged above the slag outlet, and the inlet end of the second air nozzle is connected with the hot air main pipe.
The utility model has the following beneficial effects: a coal injection gun for injecting coal powder into a blast furnace body is arranged in a hot air branch pipe of the blast furnace body for smelting manganese-rich slag, when the manganese-rich slag is smelted, poor manganese ore (ore or sintered block) and coke are added into the top of the blast furnace body, during smelting, the coal powder is injected into the blast furnace body from the hot air branch pipe while hot air is introduced into the blast furnace body, and the coal powder is rapidly oxidized and released heat under high-temperature and low-oxygen environments to serve as a reducing agent and a heat source medium to replace part of coke, so that the addition of initial coke is reduced. Meanwhile, more hydrogen than coke is discharged in the coal powder injection gasification process, so that the reduction capability and the penetration diffusion capability of coal gas are improved, and the reduction reaction speed of manganese ore is improved. The injected coal powder is gasified and combusted in front of the tuyere to maintain the smelting power of the blast furnace, and conditions are created for using high air temperature for smelting manganese-rich slag in the blast furnace. Practice shows that the coal powder can replace 900kg coke of 800-.
Drawings
FIG. 1 is a schematic view of the flow of a blast furnace for producing manganese-rich slag by a coal injection method;
FIG. 2 is a schematic structural view of a blast furnace body according to an embodiment;
FIG. 3 is a schematic diagram of a coal injection assembly according to one embodiment.
In the figure: the blast furnace 10 for producing manganese-rich slag by a coal injection method comprises a blast furnace body 100, a hot air main pipe 110, a hot air branch pipe 111, a feeding distributor 120, an iron outlet 130, a first air nozzle 131, a slag outlet 140, a second air nozzle 141, a coal injection assembly 200, a coal injection gun 210, a coal powder conveying mechanism 220, a coal powder tank 221, an injection tank 222, a coal conveying pipe 223, a coal powder splitter 224, a nitrogen feeding pipe 225, a feeding elevator 300, a mixing hopper 310, a manganese ore poor bin 311, a coke bin 312 and a silicon carbide slag bin 313.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, in an embodiment, the utility model provides a blast furnace 10 for producing manganese-rich slag by a coal injection method, which comprises a blast furnace body 100 and a coal injection assembly 200, wherein a plurality of hot air branch pipes 111 are arranged at the furnace belly of the blast furnace body 100, and the feeding ends of the hot air branch pipes 111 are connected with a hot air main pipe 110. The coal injection assembly 200 comprises a plurality of coal injection guns 210, and the outlet ends of the coal injection guns 210 are arranged in the hot air branch pipes 111 and are close to the pipe orifices of the hot air branch pipes 111.
When the manganese-rich slag is smelted, poor manganese ore (ore or sintered block) and coke are added from the top of the blast furnace body 100, during the smelting process, hot air is introduced into the blast furnace body 100, and simultaneously, coal powder is sprayed into the blast furnace body 100 from the hot air branch pipe 111, and the coal powder is rapidly oxidized under high-temperature and low-oxygen environments to release heat and is used as a reducing agent and a heat source medium to replace part of coke, so that the addition amount of initial coke is reduced. Meanwhile, more hydrogen than coke is discharged in the coal powder gasification process by blowing, so that the reduction capability and the penetration diffusion capability of coal gas are improved, and the reduction reaction speed of manganese ore is improved. The injected coal powder is gasified and combusted in front of the tuyere to maintain the smelting power of the blast furnace, and conditions are created for using high air temperature for smelting manganese-rich slag in the blast furnace. Practice shows that the coal powder can replace 900kg coke of 800-.
Preferably, the outlet end of the coal injection gun 210 is coaxial with the hot air branch pipe 111, at the pipe orifice of the hot air branch pipe 111, the pulverized coal sprayed by the coal injection gun 210 is fully mixed and contacted with the hot air input into the hot air branch pipe 111, and the pulverized coal is oxidized and cracked under the high-temperature and oxygen-deficient environment, releases heat energy and reducing substances, and promotes the reduction reaction of manganese ore.
For example, the specification is 300m3The blast furnace, its furnace body 100 furnace belly department evenly distributes 10 the hot- blast branch pipe 111, 10 all be provided with in the hot-blast branch pipe 111 coal powder injection gun 210, from around the blast furnace body 100 to the furnace belly department of blast furnace body 100 spouts the buggy, so that the heat distribution of blast furnace body 100 is balanced.
Referring to fig. 3, in an embodiment, the coal injection assembly 200 may inject the pulverized coal into the blast furnace body 100 by a dilute phase transportation method. In order to improve the coal injection efficiency and reduce the safety risk, the coal injection assembly 200 adopts a concentrated phase conveying mode to inject coal powder into the blast furnace body 100. For example, the coal injection assembly 200 further includes a coal powder conveying mechanism 220, and a discharge end of the coal powder conveying mechanism 220 is connected to a feed end of the coal injection gun 210 and is used for conveying coal powder to the coal injection gun 210. The pulverized coal conveying mechanism 220 comprises a pulverized coal tank 221 and an injection tank 222, wherein the inlet of the injection tank 222 is connected with the outlet end of the pulverized coal tank 221, the outlet of the injection tank 222 is connected with a coal conveying pipe 223, a pulverized coal splitter 224 is arranged on the coal conveying pipe 223, and the gas-phase inlet of the injection tank 222 is connected with a nitrogen feeding pipe 225. The pulverized coal stored in the pulverized coal tank 221 enters the injection tank 222, and the pulverized coal in the injection tank 222 is pressed into the coal conveying pipe 223 by using high-pressure nitrogen, and is delivered to the coal injection gun 210 after being split at the pulverized coal splitter 224. The concentrated phase conveying mode is adopted to convey the pulverized coal, so that the pulverized coal conveying efficiency can be improved, the cost is reduced, the concentration of the pulverized coal in the conveying pipe is high, and the safety risk is favorably reduced.
In still another preferred embodiment, a feeding distributor 120 is disposed at the top of the blast furnace body 100, a feeding elevator 300 is disposed at the inlet end of the feeding distributor 120, a mixing hopper 310 is disposed at the inlet end of the feeding elevator 300, and a lean manganese ore bin 311, a coke bin 312 and a silicon carbide slag bin 313 are disposed above the mixing hopper 310. Raw materials of manganese-poor ore, coke and silicon carbide slag (waste slag generated in the process of producing silicon carbide) respectively fall into the mixing hopper 310 from the manganese-poor ore bin 311, the coke bin 312 and the silicon carbide slag bin 313, are uniformly mixed, are lifted to the feeding distributor 120 by the feeding lifter 300, and are added into the blast furnace body 100 for smelting.
In the embodiment, the silicon carbide slag is mixed in the manganese-rich slag raw material, and the silicon carbide slag is used for replacing part of coke, so that the resource recycling of the silicon carbide slag is realized, and in the smelting process, the silicon carbide slag is preheated by the heat of the blast furnace, the heat conduction of the raw material is accelerated, and the separation of manganese, iron and phosphorus in the manganese ore is accelerated. When a certain temperature is reached, the silicon carbide slag is promoted to release heat, the heat energy improves the coke load, the blanking speed is accelerated, and the yield is improved.
In another embodiment, a tap hole 130 is formed at the bottom of the hearth of the blast furnace body 100, a first air nozzle 131 is arranged above the tap hole 130, and the first air nozzle 131 faces the tap hole 130. The inlet end of the first air nozzle 131 is connected to the hot air main pipe 110. The molten iron is discharged from the taphole 130, and hot air is blown to the taphole 130, so that part of reduced manganese metal in the molten iron is oxidized, and the reduction of the manganese content in the by-product iron slag is facilitated.
Further, a slag hole 140 is further formed in the hearth of the blast furnace body 100, the height of the slag hole 140 is higher than that of the tap hole 130, and the slag hole 140 is used for discharging manganese-rich slag.
Further, a second air nozzle 141 is arranged above the slag outlet 140, an inlet end of the second air nozzle 141 is connected to the hot air main pipe 110, and hot air is blown to the slag outlet 140, so that oxidation of part of reduced manganese metal in the manganese-rich slag is facilitated, and the recovery rate of the manganese-rich slag is further improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (8)
1. The utility model provides a coal injection method production is blast furnace for rich manganese sediment, includes the blast furnace body, the furnace belly punishment of blast furnace body is laid and is provided with a plurality of hot-blast branch pipes, hot-blast main pipe is connected to the feed end of hot-blast branch pipe, its characterized in that still includes the coal injection subassembly, the coal injection subassembly includes a plurality of coal injection guns, the exit end setting of coal injection gun is in the hot-blast branch pipe, and be close to the mouth of pipe department of hot-blast branch pipe.
2. The blast furnace for producing manganese-rich slag by the coal injection method according to claim 1, wherein the outlet end of the coal injection lance is arranged coaxially with the hot blast branch pipe.
3. The blast furnace for producing manganese-rich slag by the coal injection method according to claim 1, wherein the coal injection assembly further comprises a coal powder conveying mechanism, and a discharge end of the coal powder conveying mechanism is connected with a feed end of the coal injection gun and is used for conveying coal powder to the coal injection gun.
4. The blast furnace for producing manganese-rich slag by the coal injection method according to claim 3, wherein the pulverized coal conveying mechanism comprises a pulverized coal tank and an injection tank, an inlet of the injection tank is connected with an outlet end of the pulverized coal tank, an outlet of the injection tank is connected with a coal conveying pipe, a pulverized coal splitter is arranged on the coal conveying pipe, and a gas phase inlet of the injection tank is connected with a nitrogen feeding pipe fitting.
5. The blast furnace for producing manganese-rich slag by the coal injection method according to claim 1, wherein a feeding distributor is arranged at the top of the blast furnace body, a feeding elevator is arranged at the inlet end of the feeding distributor, a mixing hopper is arranged at the inlet end of the feeding elevator, and a lean manganese ore bin, a coke bin and a silicon carbide slag bin are arranged above the mixing hopper.
6. The blast furnace for producing manganese-rich slag by the coal injection method according to claim 1, wherein a taphole is arranged at the bottom of a hearth of the blast furnace body, a first air nozzle is arranged above the taphole, and the first air nozzle is opposite to the taphole; the inlet end of the first air nozzle is connected with the hot air main pipe.
7. The blast furnace for producing manganese-rich slag according to the coal injection method of claim 6, wherein a slag outlet is further formed in the hearth of the blast furnace body, and the height of the slag outlet is higher than that of the tap hole.
8. The blast furnace for producing manganese-rich slag by the coal injection method according to claim 7, wherein a second air nozzle is arranged above the slag outlet, and the inlet end of the second air nozzle is connected with the main hot air pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122367592.9U CN215887083U (en) | 2021-09-28 | 2021-09-28 | Blast furnace for producing manganese-rich slag by coal injection method |
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| CN202122367592.9U CN215887083U (en) | 2021-09-28 | 2021-09-28 | Blast furnace for producing manganese-rich slag by coal injection method |
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| CN202122367592.9U Active CN215887083U (en) | 2021-09-28 | 2021-09-28 | Blast furnace for producing manganese-rich slag by coal injection method |
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