CN213388749U - All-vanadium pellet reduction device - Google Patents

Abstract

The utility model provides an all-vanadium pellet reduction device, which comprises a charging mechanism, a reduction mechanism, a discharging mechanism and a gas distribution mechanism, wherein the charging mechanism comprises a bin and a charging bucket which are connected in series from top to bottom; the reduction mechanism comprises a shaft furnace and a reduction heating assembly arranged on the outer wall of the shaft furnace, the top of the shaft furnace is provided with a material inlet and a top gas outlet, the bottom of the shaft furnace is provided with a discharge hole and a reducing gas inlet, and the material inlet is communicated with the bottom of the charging bucket; the discharging mechanism comprises a discharger and a storage bin, the discharger is arranged at the bottom of the shaft furnace and communicated with the discharge port, and the storage bin is arranged at the bottom of the discharger to store a reduction product discharged by the discharger; the gas distribution mechanism comprises a gas storage tank, a reducing gas pipeline and a reducing gas heating assembly, wherein the reducing gas pipeline is respectively connected with the gas storage tank and a reducing gas inlet, and the reducing gas heating assembly is arranged on the outer side of the reducing gas pipeline. The reduction device has reasonable structural design, can directly reduce the vanadium pellet and has high metal yield.

Description

All-vanadium pellet reduction device

Technical Field

The utility model belongs to the technical field of full vanadium pellet smelting, more specifically say, relate to a full vanadium pellet reduction device.

Background

The vanadium-containing ilmenite in the Panxi area of China belongs to typical rock ore type minerals, and is low in weathering degree, compact in structure and difficult to reduce.

At present, in industrial production, the utilization of ilmenite is mainly carried out by adopting an electric furnace smelting method, firstly, ilmenite and coal or coke are smelted in an electric furnace, the electric furnace is heated to more than 1700 ℃, iron oxide in the ilmenite is reduced into metallic iron by smelting for about 8 hours, and slag-iron separation is realized in the furnace, so that pig iron and high-titanium slag are obtained. However, the electric furnace method has high reduction temperature and long reduction time, and therefore, the comprehensive energy consumption is high. In addition, because slag and iron are separated in the furnace, in order to ensure the fluidity of the obtained slag charge, 8-12% of FeO must be kept in the slag, so that the grade of the obtained blast furnace slag is low, the metallization rate of iron element is insufficient, and the recovery rate of the iron element is influenced. Therefore, the traditional method for preparing the high-titanium slag by the electric furnace smelting process has the problems of complex process, high cost, high energy consumption and the like, so that the research and development of a novel ilmenite reduction technology which accords with the characteristics of minerals becomes the key for reasonably utilizing the Panzhihua titanium resource.

The gas-based shaft furnace direct reduction process is a process for reducing iron ore or oxidized pellets into direct reduced iron (DRI-direct reduction iron, hereinafter referred to as DRI, sponge iron) by using a gas reducing agent, and has the advantages of high technical maturity, high single-machine productivity, low process energy consumption and low unit productivity investment. The direct reduced iron has stable chemical components and low impurity content, not only can solve the problem of shortage of high-quality scrap steel, but also can produce high-quality pure iron raw materials for steelmaking, and creates conditions for improving the quality, the grade and the added value of products. Therefore, the direct reduction of the gas-based shaft furnace is an important development direction of the iron making process in China.

SUMMERY OF THE UTILITY MODEL

To overcome the deficiencies in the prior art, one of the objects of the present invention is to solve one or more of the problems of the prior art. For example, one of the objects of the present invention is to provide a reduction apparatus capable of reducing a gas-based shaft furnace.

An all-vanadium pellet reduction device can comprise a charging mechanism, a reduction mechanism, a discharging mechanism and a gas distribution mechanism, wherein the charging mechanism comprises a bin and a charging bucket which are connected in series from top to bottom; the reduction mechanism comprises a shaft furnace and a reduction heating assembly arranged on the outer wall of the shaft furnace, the top of the shaft furnace is provided with a material inlet and a furnace top gas outlet, the bottom of the shaft furnace is provided with a discharge port and a reducing gas inlet, and the material inlet is communicated with the bottom of the charging bucket; the discharging mechanism comprises a discharger and a storage bin, the discharger is arranged at the bottom of the shaft furnace and communicated with the discharge port, and the storage bin is arranged at the bottom of the discharger to store a reduction product discharged by the discharger; the gas distribution mechanism comprises a gas storage tank, a reducing gas pipeline and a reducing gas heating assembly, wherein the reducing gas pipeline is respectively connected with the gas storage tank and a reducing gas inlet, and the reducing gas heating assembly is arranged on the outer side of the reducing gas pipeline.

Compared with the prior art, the beneficial effects of the utility model include: the utility model discloses a reduction device can realize the segmentation reduction to full vanadium titanium pellet, has avoided full vanadium titanium pellet to be heated inhomogeneous problem in reduction process, can effectual improvement metal reduction rate.

Drawings

The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

fig. 1 shows a schematic diagram of an all vanadium pellet structure according to an exemplary embodiment of the present invention;

FIG. 2 shows a cross-sectional view of a shaft furnace according to an exemplary embodiment of the present invention;

description of reference numerals:

1-stock bin, 2-charging bucket, 3-shaft furnace, 301-material inlet, 302-top gas outlet, 303-discharge outlet, 304-reducing gas inlet, 305 a-first material pushing component, 305 b-second material pushing component, 306 a-first inspection hole, 306 b-second inspection hole, 307-reducing gas replenishing hole, 4-reducing heating component, 5-discharger, 6-storage bin, 7-gas storage tank, 8-reducing gas pipeline, 9-reducing gas heating component, 10-first valve, 11-second valve, 12-cooling gas storage tank, 13-cooling pipeline, 14-pressure stabilizing tank, 15-third valve, 16-gas heating furnace, 3001-first convex body, 3001 a-first inclined surface, 3001 b-a second inclined plane, 3002-a second hollow convex body, 3002 a-a third inclined plane, 3002 b-a first vertical plane, 3002 c-a first horizontal plane, 3003-an inclined hearth surface, 3 a-a first inclined circulation cavity, 3 b-a second inclined circulation cavity, 3 c-a third vertical circulation cavity, 3 d-a fourth inclined circulation cavity, and 3010-a heat insulation layer.

Detailed Description

Hereinafter, an all-vanadium pellet reduction apparatus according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

The utility model provides an all-vanadium pellet reduction device the utility model discloses an in one exemplary embodiment of all-vanadium pellet reduction device, can include charging mechanism, reduction mechanism, arrange material mechanism and valve mechanism. Wherein,

the charging mechanism is arranged above the shaft furnace. The charging mechanism can comprise asilo 1 and acharging bucket 2 which are arranged in series from top to bottom. Acharging bucket 2 is arranged between thesilo 1 and theshaft furnace 3. Thestorage bin 1 is connected with thecharging bucket 2, and thecharging bucket 2 is connected with theshaft furnace 3 through pipelines. The stock bin 1, thecharging bucket 2, theshaft furnace 3 and the pipeline can be fixed by welding. Thestorage bin 1 and thecharging bucket 2 can be of inverted cone structures, and charging and discharging are facilitated.

The reduction mechanism may comprise ashaft furnace 3 and a reduction heating assembly 4 arranged outside the furnace body of theshaft furnace 3. The reduction heating assembly 4 is tightly attached to the outer wall of theshaft furnace 3. The reduction heating assembly 4 is used for heating theshaft furnace 3. Amaterial inlet 301 and atop gas outlet 302 are arranged at the top of theshaft furnace 3. Thematerial inlet 301 is communicated with the bottom of thecharging bucket 2 and is used for adding the all-vanadium pellet ore materials. Thetop gas outlet 302 is used for the discharge of reduced gas from theshaft furnace 3. An exhaust pipe may be connected to thetop gas outlet 302. At the bottom of theshaft furnace 3, a discharge opening 303 and a reducinggas inlet 304 are provided. The discharge opening 303 and the reducinggas inlet 304 may also be opened in the furnace wall.

The discharge mechanism may comprise adischarger 5 and a storage bin 6. Thedischarger 5 is communicated with thedischarge port 303 and is used for discharging reduced products, namely the simple substance iron and the titanium dioxide. Thedischarger 5 is connected to the discharge opening 303 through a pipe. The two ends of the pipe can be respectively fixed with thedischarger 5 and the discharge opening 303 through welding. The storage bin 6 is arranged at the lower part of thedischarger 5. The storage bin 6 and thedischarger 5 can be connected through a pipeline. The reduced material is discharged from thedischarger 5 and collected by the storage bin 6.

The valve train may include agas storage tank 7, a reducinggas line 8, and a reducing gas heating assembly 9. The gas distribution mechanism is used for providing reducing gas for the shaft furnace. The reducinggas inlet 304 is communicated with thegas storage tank 7 through a reducinggas pipeline 8. The reducing gas heating assembly 9 is arranged outside the reducinggas pipeline 8 and used for heating and warming the reducing gas. For example, the reducing gas heating unit 9 is attached to the outer wall of the reducinggas pipe 8. The heating temperature of the reducing gas heating assembly 9 can be 900 ℃ to 1000 ℃. The reducinggas line 8 may be an externally insulated stainless steel. The reducing gas is heated and then is introduced into the shaft furnace through the stainless steel with external heat preservation.

Further, as shown in fig. 1, afirst valve 10 is disposed on a pipeline between thesilo 1 and thebucket 2. Asecond valve 11 is arranged on the pipeline between thecharging bucket 2 and thematerial inlet 301. The addition of the all-vanadium pellet material can be controlled by opening and closing thefirst valve 10 and thesecond valve 11. Thefirst valve 10 and thesecond valve 11 may be stainless steel ball valves. The provision of thefirst valve 10 and thesecond valve 11 also prevents leakage of the reducing gas.

Further, the reduction device also comprises a cooling mechanism. The cooling mechanism may include a chilledgas storage tank 12 and acooling line 13, as shown in fig. 1. One end of thecooling pipeline 13 is connected with the storage bin 6, and the other end is connected with the coolinggas storage tank 12. The cooling mechanism can cool the reduction product in the storage bin 6. The cooling gas stored in the coolinggas storage tank 12 may be nitrogen gas.

Further, the reducing heating unit 4 and the reducing gas heating unit 9 may be jacketed electric furnaces. The reduction heating assembly 4 is a jacket type electric heating furnace and can effectively control the heating temperature of different sections of the shaft furnace.

Further, the gas distribution system may further include asurge tank 14, a flow meter (not shown in fig. 1), athird valve 15, and agas heating furnace 16. Apressure stabilizing tank 14 is provided between thegas storage tank 7 and the reducing gas heating assembly 9 for stabilizing the pressure of the reducing gas. Thegas container 7 may include a plurality of sub gas containers, each of which may store different gases therein. For example, as shown in fig. 1, the hydrogen storage tank includes 3 sub gas storage tanks for storing hydrogen, carbon monoxide and carbon dioxide, respectively. Carbon monoxide and hydrogen are used as the reducing gas of the vanadium pellets. Athird valve 15 and a flow meter are arranged in sequence at the outlet end of thegas reservoir 7. Thethird valve 15 may be closer to the outlet of theair reservoir 7. Thegas heating furnace 16 is provided on the reducinggas line 8. The reducing gas heating unit (9) is disposed outside the gas heating furnace (16). The third valve can effectively avoid the leakage of the reducing gas.

Further, thedischarger 5 may be a star discharger. Thedischarger 5 may be provided with water cooling.

Further, the bottom of the storage bin 6 is provided with a certain inclination for discharging. For example, the bottom of the storage bin 6 may be at an angle of 20 ° -45 ° to the horizontal.

Further, the structure of the shaft furnace may be as shown in fig. 2. The inner wall of the shaft furnace is provided with afirst protrusion 3001 and a secondhollow protrusion 3002 opposite to thefirst protrusion 3001. In the vertical cross section of the shaft furnace, the firsthollow protrusion 3001 is wedge-shaped and attached to the furnace wall, and the secondhollow protrusion 3002 is also attached to the furnace wall while being trapezoidal. Due to the existence of the firstconvex body 3001 and the second hollowconvex body 3002 arranged in the furnace body, the space in the hearth is divided into a firstinclined circulation cavity 3a, a secondinclined circulation cavity 3b, a thirdvertical circulation cavity 3c and a fourthinclined circulation cavity 3 d. The first diagonal flow-throughchamber 3a communicates with thematerial inlet 301. The fourth diagonal flow-throughchamber 3d communicates with thedischarge opening 303. Further, the firstconvex body 3001 includes a firstinclined surface 3001a and a secondinclined surface 3001b which form an acute angle with each other. The secondhollow protrusion 3002 includes a thirdinclined surface 3002a, a firstvertical surface 3002b, and a firsthorizontal surface 3002 c. The thirdinclined surface 3002a has an upper end connected to the wall of theshaft furnace 3, a lower end connected to the upper end of the firstvertical surface 3002b, one end (left end) of the firsthorizontal surface 3002c connected to the lower end of the firstvertical surface 3002b, and the other end (right end) connected to the wall of theshaft furnace 3. A firstinclined flow cavity 3a is formed between the firstinclined surface 3001a and the top of theshaft furnace 3. A seconddiagonal flow cavity 3b is formed between the secondinclined surface 3001b and the thirdinclined surface 3002 a. A third vertical flow-throughchamber 3c is formed between the firstvertical surface 3002b and the furnace wall, and a fourth inclined flow-throughchamber 3d is formed between the firsthorizontal surface 3002c and aninclined hearth surface 3003 provided on the hearth surface. For example, the angle between the firstinclined surface 3001a and the horizontal plane may be 10 ° to 30 °, which ensures that the material has a slower speed of descent to allow sufficient time for the material to complete the first stage reduction. The material is then reduced in the first inclined flow-throughchamber 3002a and enters the second inclined flow-throughchamber 3002b, where it undergoes a second stage reduction in the second inclined flow-throughchamber 3002 b. The thirdinclined surface 3002a has a larger angle with the horizontal plane, so that the material can pass through the secondinclined flow cavity 3002b in a shorter time. For example, the third inclined surface (3002 a) may have an angle of 45 ° to 50 ° with respect to the horizontal plane. Then, the material enters a fourth oblique circulating cavity (3 d) for fourth-stage reduction after being subjected to third-stage reduction through a third vertical circulating cavity (3 c). The included angle between the inclinedfurnace bottom surface 3003 and the horizontal plane can be 10-30 degrees. The heating temperature of different sections in the shaft furnace can be effectively controlled through the arranged jacket type heating furnace. By matching with the shaft furnace structure, different heating temperatures can be formed in the processes of first-stage reduction, second-stage reduction, third-stage reduction and fourth-stage reduction so as to realize the sectional reduction of the vanadium pellets. The residence time of the material flow in different reaction stages can be realized by setting different inclined angles of the inclined planes. The full vanadium-titanium pellet is subjected to segmented reduction, so that the problem that the full vanadium-titanium pellet is heated unevenly in the reduction process is solved, and the metal reduction rate can be effectively improved. The fixing of the first spur and the second hollow spur in the shaft furnace to the shaft furnace wall and between the respective faces may be conventional. For example, the metal material may be a weld, and the refractory bricks may be constructed with refractory mortar.

Further, the first inclined surface (3001 a), the third inclined surface (3002 a) and the inclined furnace bottom surface (3003) can be wave-absorbing wear-resistant sliding plates. The second inclined surface (3001 b) and the first vertical surface (3002 b) may be formed of a nanocomposite corundum material.

Further, aninsulation layer 3010 made of an insulation material may be provided on the inner side of the metal furnace wall. The firstconvex body 3001 may be filled with a heat insulating material. The inside of the secondhollow protrusion 3002 may be provided as a cavity. The inner layer of the secondhollow protrusion 3002 may also be provided with a thermal insulation material layer. The heat insulation material can be heat insulation bricks and the like.

Further, as shown in fig. 2, the shaft furnace further comprises a first pushingmember 305a and a second pushingmember 305 b. The first pushingmember 305a and the second pushingmember 305b are both disposed on the furnace wall and can slide toward the inside of the furnace chamber to push the material. The first pushingmember 305a includes a first pull ring and a first pushing body connected to the first pull ring. The lower surface of the first push body is attached to the firstinclined surface 3001a and is slidable on the firstinclined surface 3001 a. The first pushingmember 305a can push the material on the firstinclined surface 3001a from the firstinclined circulation chamber 3a into the secondinclined circulation chamber 3 b. The second pushingmember 305b includes a second pull ring and a second pushing body connected to the second pull ring. The lower surface of the second pushing body is attached to the inclinedfurnace bottom surface 3003 and can slide on the inclinedfurnace bottom surface 3003. The second pushingmember 305b is capable of pushing material on theinclined hearth floor 3003 from the fourthinclined flow chamber 3d into thedischarge opening 303. The first material pushing component and the second material pushing component are arranged to control the reduction speed of the material, and the reduction effect is improved.

Furthermore, a first access opening 306a and a second access opening 306b may be provided in the shaft furnace. The first access opening 306a and the second access opening 306b are provided to facilitate the servicing of the shaft furnace. The covers provided on the first access opening 306a and the second access opening 306b can be opened. The cover is supported by a beam member provided at a lower portion of the cover. The beam may be a wave resistant refractory beam. The cover body is made of heat-resistant materials.

Furthermore, a reducinggas replenishing port 307 may be provided on the outer furnace wall of the firstinclined circulation chamber 3 a. The reducinggas replenishment port 307 may be disposed in parallel with the reducinggas inlet 304. The reducing gas supplementing port is arranged, so that the reducing gas can circularly reciprocate in the furnace chamber, the utilization rate of the reducing gas is improved, and the reduction rate is ensured.

The utility model discloses an operating mode is for mixing the back with the reducing gas in the gas holder according to the equal proportion, and the gas after the mixture passes throughsurge tank 14, then sends intogas heating furnace 16 and heats. The heated gas enters theshaft furnace 3 through a reducinggas pipeline 8 to carry out the reduction of the vanadium pellets. The reduced gas is discharged from thetop gas outlet 302 of the upper part of theshaft furnace 3 and ignited. All-vanadium pellets with a certain particle size (8-16 mm) are loaded into the shaft furnace from the top through amaterial inlet 301 at the upper part of theshaft furnace 3, and enter a storage bin 6 from the bottom of theshaft furnace 3 through adischarger 5 after reduction is finished. Cooled in the storage bin 6 for later use.

Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The all-vanadium pellet reducing device is characterized by comprising a charging mechanism, a reducing mechanism, a discharging mechanism and a gas distribution mechanism, wherein,

the charging mechanism comprises a bin (1) and a charging bucket (2) which are arranged in series from top to bottom;

the reduction mechanism comprises a shaft furnace (3) and a reduction heating assembly (4) arranged on the outer wall of the shaft furnace, the top of the shaft furnace (3) is provided with a material inlet (301) and a furnace top gas outlet (302), the bottom of the shaft furnace (3) is provided with a discharge outlet (303) and a reduction gas inlet (304), and the material inlet (301) is communicated with the bottom of the charging bucket (2);

the discharging mechanism comprises a discharger (5) and a storage bin (6), the discharger (5) is arranged at the bottom of the shaft furnace (3) and communicated with the discharge port (303), and the storage bin (6) is arranged at the bottom of the discharger (5) to store a reduction product discharged by the discharger (5);

the gas distribution mechanism comprises a gas storage tank (7), a reducing gas pipeline (8) and a reducing gas heating assembly (9), wherein the reducing gas pipeline (8) is respectively connected with the gas storage tank (7) and a reducing gas inlet (304), and the reducing gas heating assembly (9) is arranged on the outer side of the reducing gas pipeline (8).

2. The all-vanadium pellet reduction device according to claim 1, wherein a first valve (10) is arranged between the bin (1) and the charging bucket (2), and a second valve (11) is arranged between the charging bucket (2) and the material inlet (301).

3. The all-vanadium pellet reduction plant according to claim 1 or 2, further comprising a cooling mechanism, wherein the cooling mechanism comprises a cooling gas storage tank (12) and a cooling pipeline (13), and the cooling pipeline (13) is respectively connected with the storage bin (6) and the cooling gas storage tank (12).

4. The all-vanadium pellet reduction apparatus according to claim 1 or 2, wherein the reduction heating unit (4) and the reducing gas heating unit (9) are jacketed electric furnaces.

5. The all-vanadium pellet reduction apparatus according to claim 1 or 2, wherein the gas distribution mechanism further comprises a surge tank (14), a flow meter, a third valve (15) and a gas heating furnace (16), the surge tank (14) is disposed between the gas storage tank (7) and the gas heating furnace (16), the reducing gas heating assembly (9) is disposed outside the gas heating furnace (16), and the flow meter and the third valve (15) are disposed at an outlet end of the cooling gas storage tank (12).

6. The all-vanadium pellet reduction device according to claim 1 or 2, wherein the bottom of the storage bin (6) is arranged to be an inclined bottom forming an included angle of 20-45 degrees with the horizontal plane.

7. The all-vanadium pellet reduction device according to claim 1 or 2, wherein a first convex body (3001) and a second hollow convex body (3002) are oppositely arranged on the inner wall of the furnace body of the shaft furnace (3), the longitudinal section of the first convex body (3001) is wedge-shaped, the longitudinal section of the second hollow convex body (3002) is trapezoid, the first convex body (3001) and the second hollow convex body (3002) divide the furnace chamber into a first inclined flow cavity (3 a), a second inclined flow cavity (3 b), a third vertical flow cavity (3 c) and a fourth inclined flow cavity (3 d) for material circulation, the first inclined flow cavity (3 a) is communicated with the material inlet (301), and the fourth inclined flow cavity (3 d) is communicated with the material outlet (303).

8. The all-vanadium pellet reduction apparatus according to claim 7, wherein the first protrusion (3001) comprises a first inclined surface (3001 a) and a second inclined surface (3001 b) which form an acute angle with each other, the second hollow protrusion (3002) comprises a third inclined surface (3002 a), a first vertical surface (3002 b) and a first horizontal surface (3002 c), an upper end of the third inclined surface (3002 a) is connected to the wall of the shaft furnace (3), a lower end thereof is connected to one end of the first horizontal surface (3002 c) through the first vertical surface (3002 b), the other end of the first horizontal surface (3002 c) is connected to the wall of the shaft furnace (3), a first inclined flow cavity (3 a) is formed between the first inclined surface (3001 a) and the ceiling of the shaft furnace (3), a second inclined flow cavity (3 b) is formed between the second inclined surface (3001 b) and the third inclined surface (3002 a), a third inclined flow cavity (3003 c) and a first horizontal surface (3002 c) are formed between the first vertical surface (3002 b) and the wall of the furnace And a fourth inclined circulation cavity (3 d) is formed between the inclined hearth surface (3003) and the inclined hearth surface.

9. The all-vanadium pellet reduction apparatus according to claim 8, wherein the first inclined surface (3001 a), the third inclined surface (3002 a) and the inclined hearth surface (3003) are wave-absorbing wear-resistant sliding plates, and the second inclined surface (3001 b) and the first vertical surface (3002 b) are formed of a nano composite corundum material.

10. The all-vanadium pellet reduction device according to claim 8 or 9, wherein the wall of the shaft furnace (3) is further provided with a reducing gas replenishing port (307), and the reducing gas replenishing port (307) is communicated with the first inclined flow cavity (3 a).

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