Iron phosphate / lithium iron phosphate baking system

Abstract

The utility model discloses a rotary roasting furnace, including a furnace body, a rotary furnace tube is arranged in the furnace body, a furnace chamber is formed between the rotary furnace tube and the furnace body, the two ends of the rotary furnace tube are respectively a feeding end and a discharging end, and the rotary furnace tube is provided with an exhaust port. The utility model also discloses an exhaust treatment device, including a cyclone dust removal furnace; the bottom of the cyclone dust removal furnace is provided with a lower discharge port, and the top air outlet of the cyclone dust removal furnace is connected to a bag dust collector; the bottom of the bag dust collector is provided with a second rotary discharge valve, and the top is connected to a spray tower through a first induced draft fan; the air inlet of the cyclone dust removal furnace is connected to the exhaust port of the rotary roasting furnace as described above. The utility model also discloses an iron phosphate / lithium iron phosphate roasting system. By setting the exhaust port, the rotary roasting furnace can discharge gas in time to achieve the technical purpose of controlling the moisture content, and at the same time, the content of the elements to be controlled can reach the set index requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy material production equipment, and specifically relates to an iron phosphate / lithium iron phosphate roasting system, a rotary roasting furnace and an exhaust gas treatment device. Background Art

[0002] The Chinese patent application with publication number CN112707377A discloses a system for the efficient and continuous production of anhydrous ferric phosphate. Specifically, the system includes an arch-breaking feeding barrel, a rotary flash dryer and a gas-fired rotary roaster; a feeding screw is provided at the bottom of the arch-breaking feeding barrel, and the feeding screw is connected to the rotary flash dryer; the rotary flash dryer is respectively connected to a bag filter and an exhaust pipe; a compressed nitrogen inlet pipe is provided on one side of the bag filter, and a tail gas pipe is connected to the other side through an induced draft fan, and the bottom is connected to the gas-fired rotary roaster through a rotary discharge valve; a four-way valve connected to the rotary flash dryer is provided on the top of the gas-fired rotary roaster, and a natural gas inlet pipe and an air inlet pipe with a combustion-supporting fan are respectively connected to the furnace, and a cooling section is connected to the tail; a spray cooling pipe is provided on the outer wall of the cooling section, and the spray cooling pipe is respectively connected to a cooling upper water pipe and a cooling return water pipe; an iron phosphate output pipe is provided at the bottom of one side of the cooling section.

[0003] This system can realize the preheating utilization of the rotary roasting furnace to achieve the technical goal of energy saving. However, since the gas in the rotary roasting furnace cannot be discharged in time, the water vapor contained in the gas will condense and enter the iron phosphate again in the cooling section, causing the water content of the iron phosphate to remain high. At the same time, the ions carried in the water vapor will also enter the iron phosphate again, causing some elements in the iron phosphate that need to be controlled to exceed the set indicators. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an iron phosphate / lithium iron phosphate roasting system, a rotary roasting furnace and an exhaust treatment device, wherein the rotary roasting furnace can discharge gas in time to achieve the technical purpose of controlling the water content of iron phosphate / lithium iron phosphate, and at the same time can make the content of elements that need to be controlled in iron phosphate / lithium iron phosphate meet the set index requirements.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] The utility model firstly proposes a rotary roasting furnace, comprising a furnace body, wherein a rotary furnace tube is arranged in the furnace body, a furnace chamber is formed between the rotary furnace tube and the furnace body, two ends of the rotary furnace tube are respectively a feeding end and a discharging end, and an exhaust port is arranged on the rotary furnace tube.

[0007] Furthermore, the exhaust port is arranged at the feed end of the rotary furnace tube.

[0008] The utility model also proposes an exhaust gas treatment device, wherein a lower discharge port is provided at the bottom of the cyclone dust removal furnace, and a bag dust collector is connected to the top air outlet of the cyclone dust removal furnace; a second rotary discharge valve is provided at the bottom of the bag dust collector, and a spray tower is connected to the top through a first induced draft fan; the air inlet of the cyclone dust removal furnace is connected to the exhaust port of the rotary roasting furnace as described above.

[0009] Furthermore, a cooling device is provided on the connecting pipeline between the cyclone dust removal furnace and the bag dust collector.

[0010] Furthermore, the cooling device is a spray cooling device or an air cooling device.

[0011] The utility model also proposes an iron phosphate / lithium iron phosphate roasting system, comprising a rotary roasting furnace, the rotary roasting furnace comprising a furnace body, a rotary furnace tube is arranged in the furnace body, a furnace chamber is formed between the rotary furnace tube and the furnace body, the two ends of the rotary furnace tube are respectively a feeding end and a discharging end; the rotary furnace tube is provided with an exhaust port; the exhaust port is connected to the exhaust treatment device as described above.

[0012] Furthermore, the feed end of the rotary furnace tube is connected to a feed device; the feed device includes a flash drying furnace and a flash bag dust collector, the discharge port of the flash drying furnace is connected to the feed port of the flash bag dust collector, and the discharge port of the flash bag dust collector is connected to the feed end of the rotary furnace tube through a third rotary unloading valve; the lower discharge port of the cyclone dust removal furnace is connected to the feed end of the rotary furnace tube or the flash bag dust collector.

[0013] Furthermore, a crushing feeder is connected to the feed inlet of the flash drying furnace, and the gas outlet of the furnace is connected to the crushing feeder to preheat the iron phosphate / lithium iron phosphate.

[0014] Furthermore, the discharge end of the cyclone dust removal furnace is connected to a discharge device; the discharge device includes a rotary cooling kiln, the rotary cooling kiln includes a kiln body, a rotary cooling pipe is installed in the kiln body, and a cooling furnace is formed between the rotary cooling pipe and the kiln body; the two ends of the rotary cooling pipe are respectively a feed end and a discharge end, the feed end of the rotary cooling pipe is connected to the discharge end of the cyclone dust removal furnace, and the discharge end of the rotary cooling pipe is connected to the discharge port through a fourth rotary unloading valve.

[0015] Furthermore, a spray assembly for spraying the rotary cooling pipe is provided at the top of the cooling furnace, and a liquid storage tank is provided at the bottom of the cooling furnace, and a drainage pipeline is connected to the liquid storage tank.

[0016] The beneficial effects of the utility model are:

[0017] The rotary roasting furnace of the utility model is provided with an independent exhaust port on the rotary furnace tube, so that the gas carrying water vapor in the rotary furnace tube under a high temperature environment can be quickly discharged outside the rotary furnace tube, thereby preventing the water vapor in the gas from condensing and flowing back into the iron phosphate / lithium iron phosphate, and effectively controlling the water content of the iron phosphate / lithium iron phosphate, while enabling the content of the elements that need to be controlled in the iron phosphate / lithium iron phosphate to meet the set index requirements.

[0018] Since the moisture content of the material is the highest at the feed end of the rotary furnace tube, the ratio of water vapor in the gas at the feed end of the rotary furnace tube is the highest. Therefore, by setting the exhaust port at the feed end of the rotary furnace tube, the water vapor can be discharged more efficiently.

[0019] By connecting the exhaust gas treatment device to the exhaust port of the rotary furnace tube, the solid matter contained in the gas is first separated by a cyclone dust removal furnace, and the separated solid is returned to the rotary roasting furnace to avoid material loss; then the bag dust collector is used to solidify and discharge the salt contained in the gas; finally, the spray tower is used to spray and clean the exhausted gas so that the gas meets the emission standard requirements.

[0020] Note: "Iron phosphate / lithium iron phosphate" mentioned in this article means "iron phosphate or lithium iron phosphate". BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0022] Figure 1 The utility model discloses an iron phosphate / lithium iron phosphate roasting system.

[0023] Description of reference numerals:

[0024] 10-rotary roasting furnace; 11-furnace body; 12-rotary furnace tube; 13-furnace chamber; 14-feeding end; 15-discharging end; 16-exhaust port; 17-gas delivery pipeline; 18-air delivery pipeline; 19-blower; 20-cyclone dust removal furnace; 21-first rotary discharge valve; 30-bag dust collector; 31-second rotary discharge valve; 32-first induced draft fan; 33-cooling device; 40- Spray tower; 41-exhaust port; 42-liquid system; 50-flash drying furnace; 60-flash bag filter; 61-third rotary discharge valve; 70-crushing feeder; 80-rotary cooling kiln; 81-kiln body; 82-rotary cooling pipe; 83-furnace; 84-feed end; 85-discharge end; 86-fourth rotary discharge valve; 87-discharge port; 88-liquid storage tank; 89-drainage pipeline. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] like Figure 1 As shown, the iron phosphate / lithium iron phosphate roasting system of this embodiment includes a rotary roasting furnace 10. Specifically, the rotary roasting furnace 10 of this embodiment includes a furnace body 11, a rotary furnace tube 12 is arranged in the furnace body 11, a furnace 13 is formed between the rotary furnace tube 12 and the furnace body 11, and the two ends of the rotary furnace tube 12 are respectively a feed end 14 and a discharge end 15, and an exhaust port 16 is arranged on the rotary furnace tube 12. In this embodiment, a gas delivery pipeline 17 and an air delivery pipeline 18 are connected in the furnace 13, and a blower 19 is installed on the air delivery pipeline 18. In a preferred implementation of this embodiment, the exhaust port 16 is arranged at the feed end 14 of the rotary furnace tube 12. Since the moisture content of the material (iron phosphate or lithium iron phosphate) at the feed end 14 of the rotary furnace tube 12 is the highest, the ratio of water vapor contained in the gas at the feed end of the rotary furnace tube is the highest. In this way, by arranging the exhaust port 16 at the feed end 14 of the rotary furnace tube 12, water vapor can be discharged more efficiently. In this embodiment, an independent exhaust port 16 is provided on the rotary furnace tube 12, so that the gas carrying water vapor in the rotary furnace tube 12 under high temperature environment can be quickly discharged outside the rotary furnace tube 12, thereby preventing the water vapor in the gas from condensing and flowing back into the iron phosphate / lithium iron phosphate, and effectively controlling the water content of the iron phosphate / lithium iron phosphate, while ensuring that the content of the elements that need to be controlled in the iron phosphate / lithium iron phosphate meets the set index requirements.

[0027] Specifically, the exhaust port 16 of the rotary furnace tube 12 of this embodiment is connected to an exhaust treatment device. The exhaust treatment device of this embodiment includes a cyclone dust removal furnace 20 connected to the exhaust port 16. The bottom of the cyclone dust removal furnace 20 is provided with a lower discharge port, and a first rotary discharge valve 21 is provided in the lower discharge port. Specifically, the bottom of the cyclone dust removal furnace 20 is provided with a lower discharge port connected to the feed end 14 of the rotary furnace tube 12 or the flash bag dust collector 60. In this embodiment, the bottom of the cyclone dust removal furnace 20 is provided with a lower discharge port connected to the feed end 14 of the rotary furnace tube 12. The top air outlet of the cyclone dust removal furnace 20 is connected to the bag dust collector 30; the bottom of the bag dust collector 30 is provided with a second rotary discharge valve 31, and the top is connected to the spray tower 40 through the first induced draft fan 32. Specifically, in this embodiment, a second rotary discharge valve 31 is provided at the bottom of the bag filter 30 and is connected to a discharge port, and the discharge port is used to discharge the solidified salt. In this embodiment, water is added to the solidified salt at the second rotary discharge valve 31 to dissolve the salt in the water and discharge it. In this embodiment, in order to reach the temperature required for salt solidification in the bag filter 30, a cooling device 33 is provided on the connecting pipeline between the cyclone dust removal furnace 20 and the bag filter 30. The cooling device 33 can be implemented in a variety of existing ways. The cooling device 33 of this embodiment adopts a spray cooling device, and the high-temperature gas discharged from the cyclone dust removal furnace 20 is cooled to a set temperature by spraying water and then input into the bag filter 30. Of course, the cooling device 33 can also adopt an air-cooled cooling device, which will not be repeated. In this process, the gaseous salt in the cyclone filter 20 is condensed into a solid state at a low temperature, and then collected in the bag filter 30. At least two cyclone dust removal furnaces 20 can be connected in parallel, and valves are provided on the air inlet pipe and the air outlet pipe of each cyclone dust removal path 20. In this embodiment, two cyclone dust removal furnaces 20 are connected in parallel, and one cyclone dust removal path 20 is reserved. The top of the spray tower 40 of this embodiment is provided with an exhaust port 41, and the bottom is connected with a liquid path system 42, and the liquid path system 42 can recycle the spray liquid or discharge the spray liquid. In this embodiment, the exhaust pipe of the furnace 13 is connected to the exhaust port 41.

[0028] The feed end 14 of the cyclone dust removal furnace 10 of this embodiment is connected to a feed device. The feed device of this embodiment includes a flash drying furnace 50 and a flash bag dust collector 60, the discharge port of the flash drying furnace 50 is connected to the feed port of the flash bag dust collector 60, and the discharge port of the flash bag dust collector 60 is connected to the feed end 14 of the rotary furnace tube 12 through a third rotary discharge valve 61. The feed port of the flash drying furnace 50 of this embodiment is connected to a crushing feeder 70, and the gas outlet of the furnace 13 is connected to the crushing feeder 70 to preheat the iron phosphate / lithium iron phosphate.

[0029] The discharge end 15 of the cyclone dust removal furnace 10 of the present embodiment is connected to a discharge device. The discharge device of the present embodiment includes a rotary cooling kiln 80, and the rotary cooling kiln 80 includes a kiln body 81, and a rotary cooling pipe 82 is installed in the kiln body 81, and a cooling furnace 83 is formed between the rotary cooling pipe 82 and the kiln body 81. The two ends of the rotary cooling pipe 82 are respectively a feed end 84 and a discharge end 85, and the feed end 84 of the rotary cooling pipe 82 is connected to the discharge end 15 of the cyclone dust removal furnace 10, and the discharge end 85 of the rotary cooling pipe 82 is connected to the discharge port 87 through the fourth rotary discharge valve 86. In the present embodiment, a spray assembly for spraying the rotary cooling pipe 82 is provided at the top of the cooling furnace 83, and a liquid storage tank 88 is provided at the bottom of the cooling furnace 83, and a drainage pipeline 89 is connected to the liquid storage tank 88.

[0030] The iron phosphate / lithium iron phosphate roasting system of this embodiment connects an exhaust gas treatment device to the exhaust port 16 of the rotary furnace tube 12. First, a cyclone dust removal furnace 20 is used to separate the solid matter contained in the gas, and the separated solid is returned to the rotary roasting furnace 10 to avoid material loss; then a bag filter 30 is used to solidify and discharge the salt contained in the gas; finally, a spray tower 40 is used to spray and clean the exhausted gas so that the gas meets the emission standard requirements.

[0031] The roasting system of this embodiment can be used to process iron phosphate, and can also be used to process lithium iron phosphate.

[0032] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. An iron phosphate / lithium iron phosphate roasting system, characterized in that: The rotary roasting furnace comprises a furnace body, a rotary furnace tube is arranged in the furnace body, a furnace chamber is formed between the rotary furnace tube and the furnace body, and two ends of the rotary furnace tube are respectively a feeding end and a discharging end; an exhaust port for discharging water vapor in the iron phosphate / lithium iron phosphate material is arranged on the rotary furnace tube; and an exhaust treatment device is connected to the exhaust port; The exhaust treatment device includes a cyclone dust removal furnace; a lower discharge port is provided at the bottom of the cyclone dust removal furnace, and a bag dust collector is connected to the top air outlet of the cyclone dust removal furnace; a second rotary discharge valve is provided at the bottom of the bag dust collector, and a spray tower is connected to the top through a first induced draft fan; the air inlet of the cyclone dust removal furnace is connected to the exhaust port of the rotary roasting furnace.

2. The iron phosphate / lithium iron phosphate roasting system according to claim 1, characterized in that: The exhaust port is arranged at the feeding end of the rotary furnace tube.

3. The iron phosphate / lithium iron phosphate roasting system according to claim 1, characterized in that: A cooling device is provided on the connecting pipeline between the cyclone dust removal furnace and the bag dust collector.

4. The iron phosphate / lithium iron phosphate roasting system according to claim 3, characterized in that: The cooling device is a spray cooling device or an air cooling device.

5. The iron phosphate / lithium iron phosphate roasting system according to claim 1, characterized in that: The feed end of the rotary furnace tube is connected with a feed device; the feed device includes a flash drying furnace and a flash bag dust collector, the discharge port of the flash drying furnace is connected to the feed port of the flash bag dust collector, and the discharge port of the flash bag dust collector is connected to the feed end of the rotary furnace tube through a third rotary unloading valve; the lower discharge port of the cyclone dust removal furnace is connected to the feed end of the rotary furnace tube or the flash bag dust collector.

6. The iron phosphate / lithium iron phosphate roasting system according to claim 5, characterized in that: The feed inlet of the flash drying furnace is connected to a crushing feeder, and the gas outlet of the furnace is connected to the crushing feeder to preheat the iron phosphate / lithium iron phosphate.

7. The iron phosphate / lithium iron phosphate roasting system according to claim 1, characterized in that: The discharging end of the cyclone dust removal furnace is connected to a discharging device; the discharging device includes a rotary cooling kiln, the rotary cooling kiln includes a kiln body, a rotary cooling pipe is installed in the kiln body, and a cooling furnace is formed between the rotary cooling pipe and the kiln body; the two ends of the rotary cooling pipe are respectively a feeding end and a discharging end, the feeding end of the rotary cooling pipe is connected to the discharging end of the cyclone dust removal furnace, and the discharging end of the rotary cooling pipe is connected to the discharging port through a fourth rotary unloading valve.

8. The iron phosphate / lithium iron phosphate roasting system according to claim 7, characterized in that: A spray assembly for spraying the rotary cooling pipe is provided at the top of the cooling furnace, and a liquid storage tank is provided at the bottom of the cooling furnace, and a drainage pipeline is connected to the liquid storage tank.

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