A phosphorus recovery blast furnace for lithium iron phosphate recovery slag

Abstract

The present invention discloses a phosphorus recovery blast furnace for lithium iron phosphate recovery slag, and relates to the technical field of iron phosphate recovery. It comprises a blast furnace, wherein recovery pipes are fixed on both sides of the top of the blast furnace, and heat storage mechanisms are fixed on both sides of the bottom of the blast furnace, wherein the heat storage mechanism comprises two temperature-resistance shells, the two temperature-resistance shells are located on both sides of the blast furnace, and the two are symmetrical to each other, a heat-insulating shell is fixed on the inner wall of the temperature-resistance shell, and an air inlet pipe is fixed on one side of the outer wall of the temperature-resistance shell. The present invention adds a heat-insulating shell and a heat-conducting bend pipe to the heat-storage mechanism through the arrangement of the heat-storage mechanism. When recovering phosphorus from the lithium iron phosphate recovery slag, the heat-conducting bend pipe can quickly make the air temperature reach a predetermined temperature value due to its large number of curved surfaces. At the same time, the heat-insulating shell can reduce the loss of heat from the air, thereby improving the rate of phosphorus recovery from the lithium iron phosphate recovery slag, reducing the use cost of the hot blast furnace, and reducing air pollution.

Description

Technical Field

[0001] The invention relates to the technical field of iron phosphate recovery, in particular to a phosphorus recovery blast furnace for lithium iron phosphate recovery slag. Background Art

[0002] When recovering phosphorus from iron phosphate, we need to increase the temperature and refine it, so we need a phosphorus recovery blast furnace that can recover lithium iron phosphate slag.

[0003] For example, the patent publication number CN210568546U is an air preheater for a blast furnace, which continuously draws high-temperature flue gas into the flue gas chamber through an air supply fan, and at the same time sends cold air from the outside into the air chamber through an exhaust fan. At this time, the heat of the flue gas is transferred to the cold air through a heat conduction plate. As the air supply fan works, the flue gas inside the flue gas chamber is mixed with the drawn-in flue gas through a return pipe and enters the flue gas chamber again for continuous heat conduction to heat the air. When the air chamber is supplying air, the electric control valve opens, allowing the flue gas to be discharged to the outside through the filter layer inside the return pipe. By circulating the flue gas, the utilization rate of thermal energy is improved, and the flue gas is pretreated during discharge, which provides convenience for subsequent purification work.

[0004] However, in actual use, the above-mentioned air preheater continuously heats the external air through the heat conduction plate. When the air needs to reach a higher temperature, it is necessary to wait for a long time due to the small contact area between the air inside the device and the heat conduction plate, and it is necessary to continuously input hot air through the hot blast furnace, which increases the cost of product production, reduces the product production rate, and reduces the practicality of the device. For this reason, the applicant proposes a phosphorus recovery blast furnace for lithium iron phosphate recovery slag. Summary of the Invention

[0005] The object of the present invention is to provide a phosphorus recovery blast furnace for recovering lithium iron phosphate slag to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a phosphorus recovery blast furnace for lithium iron phosphate recovery slag, comprising a blast furnace, recovery pipes are respectively fixed on both sides of the top of the blast furnace, and heat storage mechanisms are respectively fixed on both sides of the bottom of the blast furnace, the heat storage mechanism comprises two temperature-resistant shells, the two temperature-resistant shells are located on both sides of the blast furnace, and the two are symmetrical to each other, a heat-insulating shell is fixed to the inner wall of the temperature-resistant shell, an air intake pipe is fixed to one side of the outer wall of the temperature-resistant shell, one end of the air intake pipe passes through the temperature-resistant shell and one side of the outer wall of the heat-insulating shell and is fixed with a heat-conducting bent pipe, one end of the heat-conducting bent pipe is fixed with an exhaust pipe, one end of the exhaust pipe passes through the heat-insulating shell and one side of the inner wall of the temperature-resistant shell and is fixed with an air suction pump, the air outlet end of the air suction pump is fixed with a temperature return pipe, an air suction pipe is fixed to one side of the outer wall of the temperature-resistant shell, and the air intake pipe is located inside the air suction pipe.

[0007] Preferably, a cleaning mechanism is fixed on one side of the heat storage mechanism, and the two are connected. A hot blast furnace is fixed on one side of the cleaning mechanism, and the two are connected. One end of the bottom of the heat storage mechanism is fixed to one side of the hot blast furnace, and the two are connected. A slag discharge pipe is fixed to the bottom of one side of the blast furnace, and a discharge pipe is fixed to the bottom of the other side of the blast furnace. The slag discharge pipe is located at the top of the discharge pipe, the heat storage mechanism is located at the top of the slag discharge pipe, and a feed pipe is fixed to the top of the blast furnace.

[0008] Preferably, a fixed frame is fixed to the inner wall of the intake pipe, a motor is fixed to one side of the fixed frame, a fan is fixed to the output end of the motor, valves are fixed on the other two sides of the outer wall of the temperature-resistant shell, one end of one of the valves is fixed to a fan, an air inlet pipe is fixed to the air outlet end of the fan, and a temperature detector is fixed to the top of the outer wall of the temperature-resistant shell.

[0009] Preferably, the suction pipe, air inlet pipe, heat conduction elbow, exhaust pipe, suction pump and temperature return pipe are sequentially connected, and the valve, insulation shell, fan and air inlet pipe are sequentially connected.

[0010] Preferably, the cleaning mechanism includes two shells, the two shells are located on both sides of the blast furnace, and the two are symmetrical to each other, the top and bottom of the shells are both provided with openings, slide rods are fixed on both sides of the inner wall of the shell, a filter plate is fixed on one side of the two slide rods, and an installation box is commonly threaded on both sides of the outer wall of the shell, two stretching cylinders are fixed on the top of the inner wall of the installation box, the output end of the stretching cylinder passes through the opening opened on the top of the shell and is fixed with a card block, a solid block is clamped on one side of the card block, a cleaning strip is fixed between the two solid blocks, and a top frame is fixed on the bottom of the cleaning strip.

[0011] Preferably, a bottom box is fixed to the bottom of the shell, the opening provided at the bottom of the shell corresponds to the opening at the top of the bottom box, and a collection box is slidably engaged with the inner wall of the bottom box, and auxiliary rods are fixed on both sides of the inner wall of the collection box, the top of the auxiliary rod is in contact with the bottom of the slide rod, the notches between the auxiliary rod and the slide rod are equal in size, and the notches of the two correspond to each other, a telescopic plate is fixed to the inner wall of the bottom box, a base frame is fixed on the top of the telescopic plate, the top frame and the base frame are engaged with each other, a cleaning plate is fixed on one side of the inner wall of the collection box, and a dustproof plate is fixed at the top opening of the collection box, and a suction pipe is fixed on one side of the shell, and one end of the suction pipe is fixed to the air outlet end of the hot air furnace.

[0012] Preferably, the distance between the two stretching cylinders is smaller than the length of the opening opened at the top of the outer shell, the distance between one side of the dustproof plate and one side of the inner wall of the collecting box is greater than or equal to the width of the telescopic plate, the maximum height of the telescopic plate is greater than the sum of the heights of the outer shell and the bottom box, and the minimum height of the telescopic plate is less than the height of the bottom box.

[0013] Preferably, the suction pump, motor, valve, fan, temperature detector, stretching cylinder and hot air furnace are electrically connected in sequence, and the seven share a control terminal.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The phosphorus recovery blast furnace for lithium iron phosphate recovery slag has a heat storage mechanism, in which a heat-insulating shell and a heat-conducting bent pipe are added. When recovering phosphorus from the lithium iron phosphate recovery slag, the heat-conducting bent pipe can quickly make the air temperature reach a predetermined temperature value due to its large number of curved surfaces. At the same time, the heat-insulating shell can reduce the loss of heat from the air, thereby increasing the rate of phosphorus recovery from the lithium iron phosphate recovery slag, reducing the use cost of the hot blast furnace, and reducing air pollution.

[0016] At the same time, an exhaust pipe and a temperature return pipe are added to the heat storage mechanism. When preheating the air, after the hot gas passes through the heat-conducting bent pipe, in order to reduce the heat loss of the hot gas, the hot gas will enter the temperature return pipe through the exhaust pipe, and finally return to the hot blast furnace for secondary heating, which further reduces the use cost of the hot blast furnace, reduces air pollution, and increases the rate of recovering phosphorus by lithium iron phosphate recovery slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of the present invention;

[0018] Figure 2 for Figure 1 A partial enlarged view of part A;

[0019] Figure 3 It is a schematic diagram of the top structure of the present invention;

[0020] Figure 4 Schematic diagram of the bottom structure of the present invention;

[0021] Figure 5 Schematic diagram of the heat storage mechanism structure of the present invention;

[0022] Figure 6 It is a schematic structural diagram of the cleaning mechanism of the present invention;

[0023] Figure 7 for Figure 6 A partial enlarged view of part B.

[0024] In the figure: 1. Blast furnace; 2. Recovery pipe; 3. Heat storage mechanism; 301. Temperature-resistance shell; 302. Insulation shell; 303. Inlet pipe; 304. Heat-conducting elbow; 305. Exhaust pipe; 306. Suction pump; 307. Temperature return pipe; 308. Suction pipe; 309. Fixing frame; 310. Motor; 311. Fan; 312. Valve; 313. Fan; 314. Inlet pipe; 315. Temperature detector; 4. Cleaning mechanism; 401. Casing; 402, slide rod; 403, filter plate; 404, mounting box; 405, stretching cylinder; 406, clamping block; 407, solid block; 408, cleaning strip; 409, top frame; 410, bottom box; 411, collecting box; 412, auxiliary rod; 413, telescopic plate; 414, bottom frame; 415, cleaning plate; 416, dustproof plate; 417, suction pipe; 5, hot air furnace; 6, slag discharge pipe; 7, discharge pipe; 8, feed pipe. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] When recovering phosphorus from lithium iron phosphate recovery slag, in order to improve the rapid dissolution of the lithium iron phosphate recovery slag and quickly carry out chemical reactions, a phosphorus recovery blast furnace for lithium iron phosphate recovery slag is required. In actual use, most traditional phosphorus recovery blast furnaces mostly form convection between the flue gas and air in the hot blast furnace for heat exchange and heat the cold air. This method not only prevents the air from being effectively heated to the temperature required by the process, but also reduces the thermal energy utilization rate of the flue gas and the recovery rate of phosphorus from the lithium iron phosphate recovery slag. Therefore, the applicant proposes a phosphorus recovery blast furnace for lithium iron phosphate recovery slag.

[0027] like Figure 1-Figure 7As shown, the present invention provides a technical solution: a phosphorus recovery blast furnace for lithium iron phosphate recovery slag, comprising a blast furnace 1, recovery pipes 2 are respectively fixed on both sides of the top of the blast furnace 1, and heat storage mechanisms 3 are respectively fixed on both sides of the bottom of the blast furnace 1, and the heat storage mechanism 3 includes two temperature-resistant shells 301, the two temperature-resistant shells 301 are located on both sides of the blast furnace 1, and the two are symmetrical to each other, a heat-insulating shell 302 is fixed on the inner wall of the temperature-resistant shell 301, an air inlet pipe 303 is fixed on one side of the outer wall of the temperature-resistant shell 301, and one end of the air inlet pipe 303 passes through one side of the outer wall of the temperature-resistant shell 301 and the heat-insulating shell 302. A heat conduction elbow 304 is fixed, an exhaust pipe 305 is fixed at one end of the heat conduction elbow 304, an air suction pump 306 is fixed after one end of the exhaust pipe 305 passes through the inner wall of the heat preservation shell 302 and the temperature resistance shell 301, a temperature return pipe 307 is fixed at the outlet end of the air suction pump 306, an air suction pipe 308 is fixed on one side of the outer wall of the temperature resistance shell 301, and the air inlet pipe 303 is located inside the air suction pipe 308. A cleaning mechanism 4 is fixed on one side of the heat storage mechanism 3, and the two are connected. A hot air furnace 5 is fixed on one side of the cleaning mechanism 4, and the two are connected. One end of the bottom of the heat storage mechanism 3 is connected to the hot air furnace 5 is fixed on one side, and the two are connected. A slag discharge pipe 6 is fixed to the bottom of one side of the blast furnace 1, and a discharge pipe 7 is fixed to the bottom of the other side of the blast furnace 1. The slag discharge pipe 6 is located on the top of the discharge pipe 7, and the heat storage mechanism 3 is located on the top of the slag discharge pipe 6. A feed pipe 8 is fixed to the top of the blast furnace 1. A fixed frame 309 is fixed to the inner wall of the suction pipe 308. A motor 310 is fixed to one side of the fixed frame 309. A fan 311 is fixed to the output end of the motor 310. Valves 312 are fixed to the other two sides of the outer wall of the temperature-resistant shell 301. A fan 313 is fixed to one end of one of the valves 312. An air inlet pipe 314 is fixed to the air outlet end of 313, a temperature detector 315 is fixed to the top of the outer wall of the temperature-resistant shell 301, the intake pipe 308, the intake pipe 303, the heat-conducting elbow 304, the exhaust pipe 305, the intake pump 306 and the temperature return pipe 307 are connected in sequence, the valve 312, the insulation shell 302, the fan 313 and the air inlet pipe 314 are connected in sequence, the intake pump 306, the motor 310, the valve 312, the fan 313, the temperature detector 315, the stretching cylinder 405 and the hot air furnace 5 are electrically connected in sequence, and the seven share a control terminal.

[0028] It should be noted that: when recovering phosphorus from lithium iron phosphate recovery slag, first, carbon and iron phosphate are added to the blast furnace 1 through the feed pipe 8. As the hot blast furnace 5 continues to heat up, the flue gas inside it will flow because the motor 310 in the heat storage mechanism 3 drives the fan 311 to rotate. At this time, the flue gas will be filtered by the filter plate 403 in the cleaning mechanism 4, so that the dust and slag in the flue gas will not enter the heat storage mechanism 3. At this time, the valve 312 in the heat storage mechanism 3 will also open to allow external air to enter the insulation shell 302. At the same time, the filtered flue gas will flow to the air intake pipe 303 under the rotation of the fan 311. Under the action of the suction pump 306, the flue gas at the air intake pipe 303 will be sucked into the heat conduction elbow 304, because the heat conduction elbow 304 is located in the insulation shell. Shell 302, at this time, the air inside the insulation shell 302 will be heated rapidly. When the temperature reaches a certain predetermined value, the speed of the motor 310 will be reduced accordingly. At the same time, the heated air in the insulation shell 302 will enter the blast furnace 1 through the fan 313. At this time, when the temperature of iron phosphate and carbon in the blast furnace 1 rises to 1300 to 1600 degrees, phosphorus gas, iron and carbon monoxide will be generated. The gas generated at this time will be recycled through the recovery pipe 2 to increase the temperature inside the blast furnace 1 and increase the rate of recovering phosphorus by lithium iron phosphate recovery slag. When the flue gas passes through the heat conduction elbow 304 to the exhaust pipe 305, due to the action of the suction pump 306, the flue gas will pass through the temperature return pipe 307 to re-enter the hot blast furnace 5 for heating, thereby completing the operation of recovering phosphorus from the lithium iron phosphate recovery slag.

[0029] like Figure 6-Figure 7As shown, the present invention provides a technical solution: a phosphorus recovery blast furnace for lithium iron phosphate recovery slag, including a cleaning mechanism 4 including two shells 401, the two shells 401 are located on both sides of the blast furnace 1, and the two shells are symmetrical to each other, the top and bottom of the shells 401 are both opened, the inner walls of the shells 401 are respectively fixed with slide rods 402, one side of the two slide rods 402 is commonly fixed with a filter plate 403, the outer walls of the shells 401 are commonly threaded with a mounting box 404, the top of the inner wall of the mounting box 404 is There are two stretching cylinders 405 fixed on the top of the shell 401. The output end of the stretching cylinder 405 passes through the opening opened at the top of the shell 401 and is fixed with a clamping block 406. A solid block 407 is clamped on one side of the clamping block 406. A cleaning strip 408 is fixed between the two solid blocks 407. A top frame 409 is fixed on the bottom of the cleaning strip 408. A bottom box 410 is fixed on the bottom of the shell 401. The opening opened at the bottom of the shell 401 corresponds to the top opening of the bottom box 410. A collection box 411 is slidably clamped on the inner wall of the bottom box 410. The collection box 411 is fixed on the bottom of the shell 401. 11. Auxiliary rods 412 are fixed on both sides of the inner wall. The top of the auxiliary rod 412 contacts the bottom of the slide rod 402. The slots between the auxiliary rod 412 and the slide rod 402 are equal in size and correspond to each other. A telescopic plate 413 is fixed to the inner wall of the bottom box 410. A bottom frame 414 is fixed to the top of the telescopic plate 413. The top frame 409 and the bottom frame 414 are mutually engaged. A cleaning plate 415 is fixed to one side of the inner wall of the collection box 411. A dust plate 415 is fixed to the top opening of the collection box 411. 16. A suction pipe 417 is fixed to one side of the outer shell 401, and one end of the suction pipe 417 is fixed to the air outlet end of the hot air furnace 5. The distance between the two stretching cylinders 405 is smaller than the length of the opening at the top of the outer shell 401. The distance between one side of the dustproof plate 416 and one side of the inner wall of the collecting box 411 is greater than or equal to the width of the telescopic plate 413. The maximum height of the telescopic plate 413 is greater than the sum of the heights of the outer shell 401 and the bottom box 410. The minimum height of the telescopic plate 413 is less than the height of the bottom box 410.

[0030] It should be noted that: when filtering the smoke in the hot blast furnace 5, the stretching cylinder 405 will drive the cleaning strip 408 to move downward, so that the cleaning strip 408 is inside the collection box 411. When the temperature detector 315 detects that the air temperature reaches or exceeds a predetermined value, the speed of the motor 310 will decrease or stop. At this time, the stretching cylinder 405 will drive the cleaning strip 408 to clean the filter plate 403. At the same time, the telescopic plate 413 will also be lifted by the stretching cylinder 405, which can prevent the treatment from The smoke at the air inlet pipe 303 flows back, and the dust cleaned by the cleaning strip 408 will fall on the top of the base frame 414. When a lot of dust accumulates on the top of the base frame 414, the dust will slide into the interior of the collection box 411 for collection due to the obstruction of the telescopic plate 413. When the telescopic plate 413 descends under the drive of the stretching cylinder 405, the cleaning plate 415 will clean the dust that may be attached to the surface of the telescopic plate 413, thereby ensuring the cleanliness of the cleaning mechanism 4 and reducing the cost of manual cleaning.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the accompanying embodiments and their equivalents.

Claims

1. A phosphorus recovery blast furnace for recovering lithium iron phosphate slag, comprising a blast furnace (1), characterized in that: Recovery pipes (2) are fixed to both sides of the top of the blast furnace (1), and heat storage mechanisms (3) are fixed to both sides of the bottom of the blast furnace (1). The heat storage mechanism (3) comprises two temperature-resistance shells (301). The two temperature-resistance shells (301) are located on both sides of the blast furnace (1) and are symmetrical to each other. A heat-insulating shell (302) is fixed to the inner wall of the temperature-resistance shell (301), and an air inlet pipe (303) is fixed to one side of the outer wall of the temperature-resistance shell (301). One end of the air inlet pipe (303) passes through the temperature-resistance shell (301). A heat conduction bend (304) is fixed to one side of the outer wall of the heat-insulating shell (302), an exhaust pipe (305) is fixed to one end of the heat conduction bend (304), an air suction pump (306) is fixed to one end of the exhaust pipe (305) after passing through the heat-insulating shell (302) and one side of the inner wall of the heat-resisting shell (301), a return temperature pipe (307) is fixed to the air outlet end of the air suction pump (306), an air suction pipe (308) is fixed to one side of the outer wall of the heat-resisting shell (301), and the air inlet pipe (303) is located inside the air suction pipe (308); Wherein, a cleaning mechanism (4) is fixed on one side of the heat storage mechanism (3), and the two are connected; a hot blast furnace (5) is fixed on one side of the cleaning mechanism (4), and the two are connected; one end of the bottom of the heat storage mechanism (3) is fixed to one side of the hot blast furnace (5), and the two are connected; a slag discharge pipe (6) is fixed on the bottom of one side of the blast furnace (1), and a discharge pipe (7) is fixed on the bottom of the other side of the blast furnace (1); the slag discharge pipe (6) is located at the top of the discharge pipe (7); the heat storage mechanism (3) is located at the top of the slag discharge pipe (6), and a feed pipe (8) is fixed on the top of the blast furnace (1); A fixing frame (309) is fixed to the inner wall of the air intake pipe (308), a motor (310) is fixed to one side of the fixing frame (309), a fan (311) is fixed to the output end of the motor (310), valves (312) are fixed to the other two sides of the outer wall of the temperature-resistance shell (301), a fan (313) is fixed to one end of one of the valves (312), an air inlet pipe (314) is fixed to the air outlet end of the fan (313), and a temperature detector (315) is fixed to the top of the outer wall of the temperature-resistance shell (301); The suction pipe (308), the air inlet pipe (303), the heat conduction elbow (304), the exhaust pipe (305), the suction pump (306) and the temperature return pipe (307) are sequentially connected, and the valve (312), the heat insulation shell (302), the fan (313) and the air inlet pipe (314) are sequentially connected; The cleaning mechanism (4) comprises two shells (401), the two shells (401) are located on both sides of the blast furnace (1), and the two shells (401) are symmetrical to each other, the top and bottom of the shells (401) are both provided with openings, the inner walls of the shells (401) are respectively fixed with slide rods (402), and a filter plate (403) is fixed on one side of the two slide rods (402), the outer walls of the shells (401) are commonly threaded with a mounting box (404), the inner wall top of the mounting box (404) is fixed with two stretching cylinders (405), the output end of the stretching cylinder (405) passes through the opening provided in the top of the shell (401) and is fixed with a clamping block (406), one side of the clamping block (406) is clamped with a solid block (407), a cleaning strip (408) is fixed between the two solid blocks (407), and the bottom of the cleaning strip (408) is fixed with a top frame (409).

2. The phosphorus recovery blast furnace for lithium iron phosphate recovery slag according to claim 1, characterized in that: A bottom box (410) is fixed to the bottom of the shell (401), an opening at the bottom of the shell (401) corresponds to an opening at the top of the bottom box (410), a collection box (411) is slidably engaged with the inner wall of the bottom box (410), auxiliary rods (412) are fixed on both sides of the inner wall of the collection box (411), the top of the auxiliary rod (412) contacts the bottom of the slide rod (402), the slots between the auxiliary rod (412) and the slide rod (402) are equal in size, and the slots of the two are aligned with each other. A telescopic plate (413) is fixed to the inner wall of the bottom of the bottom box (410), a bottom frame (414) is fixed to the top of the telescopic plate (413), the top frame (409) and the bottom frame (414) are mutually engaged, a cleaning plate (415) is fixed to one side of the inner wall of the collecting box (411), a dustproof plate (416) is fixed to the top opening of the collecting box (411), an air suction pipe (417) is fixed to one side of the outer shell (401), and one end of the air suction pipe (417) is fixed to the air outlet end of the hot air furnace (5).

3. The phosphorus recovery blast furnace for lithium iron phosphate recovery slag according to claim 2, characterized in that: The distance between the two stretching cylinders (405) is smaller than the length of the opening opened at the top of the housing (401), the distance between one side of the dustproof plate (416) and one side of the inner wall of the collecting box (411) is greater than or equal to the width of the telescopic plate (413), the maximum height of the telescopic plate (413) is greater than the sum of the heights of the housing (401) and the bottom box (410), and the minimum height of the telescopic plate (413) is less than the height of the bottom box (410).

4. The phosphorus recovery blast furnace for lithium iron phosphate recovery slag according to claim 1, characterized in that: The suction pump (306), motor (310), valve (312), fan (313), temperature detector (315), stretching cylinder (405) and hot air furnace (5) are electrically connected in sequence, and the seven share a control terminal.

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