CN112707377A - System and method for efficiently and continuously producing anhydrous iron phosphate - Google Patents

System and method for efficiently and continuously producing anhydrous iron phosphate Download PDF

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Publication number
CN112707377A
CN112707377A CN202110018193.3A CN202110018193A CN112707377A CN 112707377 A CN112707377 A CN 112707377A CN 202110018193 A CN202110018193 A CN 202110018193A CN 112707377 A CN112707377 A CN 112707377A
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China
Prior art keywords
gas
pipe
rotary
bag
type dust
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Pending
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CN202110018193.3A
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Chinese (zh)
Inventor
骆浩
谭永鹏
赵旭
徐瑞
秦云龙
郭雨
周钰君
王苏
徐立龙
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Tianhua Institute of Chemical Machinery and Automation Co Ltd
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Tianhua Institute of Chemical Machinery and Automation Co Ltd
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Priority to CN202110018193.3A priority Critical patent/CN112707377A/en
Publication of CN112707377A publication Critical patent/CN112707377A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/16Oxyacids of phosphorus; Salts thereof
    • C01B25/26Phosphates
    • C01B25/37Phosphates of heavy metals
    • C01B25/375Phosphates of heavy metals of iron

Abstract

The invention relates to a system for efficiently and continuously producing anhydrous iron phosphate. The bottom of the arch-breaking feeding barrel is provided with a feeding screw which is connected with a rotary flash evaporation dryer; the rotary flash dryer is connected with a bag-type dust collector and an emptying pipe; one side of the bag-type dust collector is provided with a compressed nitrogen input pipe, the other side of the bag-type dust collector is connected with a tail gas pipe through a draught fan, and the bottom of the bag-type dust collector is connected with a gas-type rotary roasting furnace through a rotary discharge valve; the top of the gas type rotary roasting furnace is provided with a four-way valve connected with a rotary flash dryer, a hearth is connected with a natural gas input pipe and an air input pipe with a combustion-supporting fan, and the tail part of the hearth is connected with a cooling section; the outer wall of the cooling section is provided with a spray cooling pipe which is connected with a cooling water feeding pipe and a cooling water return pipe; and a ferric phosphate output pipe is arranged at the bottom of one side of the cooling section. The invention also discloses a method for producing the anhydrous iron phosphate. The invention can improve the product quality and yield and reduce the cost.

Description

System and method for efficiently and continuously producing anhydrous iron phosphate
Technical Field
The invention relates to the technical field of fuel cells, in particular to a system and a method for efficiently and continuously producing anhydrous iron phosphate.
Background
Compared with a fuel cell, a lithium ion battery has the advantages of high energy density, long service life, high rated voltage, low self-discharge rate and the like, and is a main development object of the energy storage industry at present. The ferric phosphate has stable structure and rich raw materials, is a precursor of a lithium iron phosphate material, and can be independently used as an anode material of a lithium ion battery.
At present, the method of an electric heating roller kiln is mainly adopted for drying and roasting the ferric phosphate dihydrate. Roller kilns are static equipment, and the material is loaded slow moving by the tray, and top and side carry out radiant heating to the material with electric heating, and this equipment has following problem: the tray has the advantages that heat can be transferred only from outside to inside, the temperature of materials inside the tray is lower than the temperature of materials on the surface all the time, the temperature of the materials inside the tray also reaches the required temperature, the heating temperature needs to be artificially increased, energy consumption is unnecessarily increased, and meanwhile, the quality of products inside and outside is not uniform. Due to the fact that the materials are placed statically, in order to enable the internal materials to be heated fully, the stay time needs to reach several days, and therefore the equipment is large in size and low in yield. The material tray needs to be replaced frequently under the alternating action of high temperature and low temperature and the corrosion action of materials, and the equipment maintenance cost is high.
Disclosure of Invention
The invention aims to provide a system for efficiently and continuously producing anhydrous iron phosphate, which improves the product quality and yield and reduces the cost.
The invention aims to solve another technical problem of providing a method for efficiently and continuously producing anhydrous iron phosphate.
In order to solve the problems, the system for efficiently and continuously producing the anhydrous iron phosphate is characterized by comprising the following steps: the system comprises an arch-breaking feeding barrel, a rotary flash evaporation dryer and a gas-fired rotary roasting furnace; the bottom of the arch-breaking feeding barrel is provided with a feeding screw, and the feeding screw is connected with the rotary flash evaporation dryer; the rotary flash evaporation dryer is respectively connected with a bag-type dust collector and an emptying pipe; one side of the bag-type dust collector is provided with a compressed nitrogen input pipe, the other side of the bag-type dust collector is connected with a tail gas pipe through a draught fan, and the bottom of the bag-type dust collector is connected with the gas-type rotary roasting furnace through a rotary discharge valve; the top of the gas-fired rotary roasting furnace is provided with a four-way valve connected with the rotary flash dryer, a hearth is respectively connected with a natural gas input pipe and an air input pipe with a combustion-supporting fan, and the tail part of the hearth is connected with a cooling section; the outer wall of the cooling section is provided with a spray cooling pipe which is respectively connected with a cooling water feeding pipe and a cooling water return pipe; and a ferric phosphate output pipe is arranged at the bottom of one side of the cooling section.
The smooth finish of the inner wall surface of the gas type rotary roasting furnace is 0.4 micron.
A method for efficiently and continuously producing anhydrous iron phosphate comprises the following steps:
conveying a filter cake of iron phosphate dihydrate containing a large amount of free water into a feeding screw through an arch breaking feeding barrel, and feeding the filter cake into a rotary flash evaporation dryer through the feeding screw to obtain pre-dried iron phosphate dihydrate;
secondly, the pre-dried ferric phosphate dihydrate enters a bag-type dust remover along with tail gas, and compressed nitrogen is input into the bag-type dust remover, so that wet tail gas and the pre-dried ferric phosphate dihydrate after dust removal are obtained after gas-solid separation; the moisture-containing tail gas is exhausted by an induced draft fan;
thirdly, the pre-dried ferric phosphate after dust removal enters a feed inlet of a gas type rotary roasting furnace through a rotary discharge valve, meanwhile, natural gas is input into a hearth of the gas type rotary roasting furnace, air is input through a combustion fan, and high-temperature roasting is carried out at the temperature of 600-800 ℃, so that roasted anhydrous ferric phosphate and heat-exchanged high-temperature flue gas are respectively obtained; the high-temperature flue gas after heat exchange returns to the rotary flash evaporation dryer through a four-way valve to pre-dry the high-moisture material;
and fourthly, the roasted anhydrous ferric phosphate enters a cooling section, and the anhydrous ferric phosphate is cooled in a mode that cooling water is sprayed on the outer wall of the cooling section, so that the cooled ferric phosphate is obtained.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, through the rotary flash evaporation dryer and the gas type rotary roasting furnace, the time required by production is shortened, the energy consumption is saved, the product quality and the yield are improved, and the equipment maintenance cost is reduced.
In the prior art, a static equipment roller kiln is always adopted in the drying and roasting process in order to avoid introducing magnetic impurities due to friction caused by relative motion between a dihydrate ferric phosphate material and equipment. The invention adopts the dynamic equipment rotary kiln, greatly shortens the retention time of the material drying process and improves the drying efficiency. For dynamic equipment, magnetic impurities are easily brought in by friction between materials and the equipment, so that the friction coefficient between the iron phosphate dihydrate material and the wall surface of the rotary kiln is very small by improving the smoothness of a contact part of the equipment and the materials to 0.4 micron, the phenomena of scrap iron and the like caused by stripping of the equipment materials are avoided, the materials are uniformly heated in the dynamic equipment, and the obtained product is uniformly fired.
2. The invention adds the process of rotary flash evaporation and predrying before the high-temperature roasting of the raw materials, and utilizes the residual heat of the gas rotary roasting furnace to predry the moisture in the ferric phosphate dihydrate, so that the heat is fully utilized.
After the dihydrate ferric phosphate material is roasted in the gas roasting furnace, the temperature of hot flue gas at the outlet is still about 500 ℃, and the gas roasting furnace has very high heat. Therefore, the rotary flash evaporation dryer is added in front of the roasting furnace, hot flue gas at the outlet of the roasting furnace is introduced into the rotary flash evaporation dryer, waste heat is used for pre-drying ferric phosphate dihydrate materials, the exhaust gas temperature is reduced, the temperature of gas discharged from the rotary flash evaporation dryer is only about 150 ℃, heat generated by the roasting furnace is fully utilized, the heat utilization rate of the whole system is greatly improved, the energy consumption is reduced, and resources are saved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention.
In the figure: 1-breaking an arch feeding barrel; 2-a feed screw; 3-spin flash dryer; 4-bag dust collector; 5-rotating the discharge valve; 6-combustion-supporting fan; 7-a draught fan; a 8-four-way valve; 9-gas type rotary roasting furnace; 10-cooling section.
Detailed Description
As shown in fig. 1, the system for efficiently and continuously producing anhydrous iron phosphate comprises an arch-breaking feeding barrel 1, a rotary flash dryer 3 and a gas-fired rotary roasting furnace 9.
The bottom of the arch-breaking feeding barrel 1 is provided with a feeding screw 2, and the feeding screw 2 is connected with a rotary flash evaporation dryer 3; the rotary flash dryer 3 is respectively connected with a bag-type dust collector 4 and an emptying pipe; one side of the bag-type dust collector 4 is provided with a compressed nitrogen input pipe, the other side is connected with a tail gas pipe through a draught fan 7, and the bottom of the bag-type dust collector is connected with a gas-type rotary roasting furnace 9 through a rotary discharge valve 5; the top of the gas type rotary roasting furnace 9 is provided with a four-way valve 8 connected with the rotary flash dryer 3, the hearth is respectively connected with a natural gas input pipe and an air input pipe with a combustion-supporting fan 6, and the tail part of the hearth is connected with a cooling section 10; the outer wall of the cooling section 10 is provided with a spray cooling pipe which is respectively connected with a cooling water feeding pipe and a cooling water return pipe; and a ferric phosphate output pipe is arranged at the bottom of one side of the cooling section 10.
Wherein: the smooth finish of the inner wall surface of the gas type rotary roasting furnace 9 is 0.4 micron.
A method for efficiently and continuously producing anhydrous iron phosphate comprises the following steps:
the method comprises the steps that a dihydrate iron phosphate filter cake containing a large amount of free water is conveyed into a feeding screw 2 through an arch breaking feeding barrel 1, the dihydrate iron phosphate filter cake enters a rotary flash drying machine 3 through the feeding screw 2, wet materials are quickly scattered and dried under the combined action of a scattering device and hot air, most of free water in the materials is removed, and pre-dried dihydrate iron phosphate is obtained;
secondly, the pre-dried ferric phosphate dihydrate enters a bag-type dust remover 4 along with tail gas, meanwhile, compressed nitrogen is input into the bag-type dust remover 4, and wet tail gas and the pre-dried ferric phosphate dihydrate after dust removal are respectively obtained after gas-solid separation; the wet tail gas is discharged by a draught fan 7;
thirdly, the pre-dried ferric phosphate after dust removal enters a feed inlet of a gas type rotary roasting furnace 9 through a rotary discharge valve 5, meanwhile, natural gas is input into a hearth of the gas type rotary roasting furnace 9, air is input through a combustion fan 6, high-temperature roasting is carried out at the temperature of 600-800 ℃, residual free water in the materials is evaporated, and water is removed and evaporated in a combined manner, so that the roasted anhydrous ferric phosphate and the heat-exchanged high-temperature flue gas are respectively obtained; the high-temperature flue gas after heat exchange returns to the rotary flash dryer 3 through the four-way valve 8 to pre-dry the high-moisture material;
the roasted anhydrous iron phosphate enters the cooling section 10, and is cooled by spraying cooling water on the outer wall, so that the cooled iron phosphate is obtained.

Claims (3)

1. The utility model provides a system for anhydrous ferric phosphate of high-efficient continuous production which characterized in that: the system comprises an arch-breaking feeding barrel (1), a rotary flash evaporation dryer (3) and a gas-fired rotary roasting furnace (9); the bottom of the arch-breaking feeding barrel (1) is provided with a feeding screw (2), and the feeding screw (2) is connected with the rotary flash evaporation dryer (3); the rotary flash evaporation dryer (3) is respectively connected with a bag-type dust collector (4) and an emptying pipe; one side of the bag-type dust collector (4) is provided with a compressed nitrogen input pipe, the other side of the bag-type dust collector is connected with a tail gas pipe through a draught fan (7), and the bottom of the bag-type dust collector is connected with the gas-type rotary roasting furnace (9) through a rotary discharge valve (5); a four-way valve (8) connected with the rotary flash evaporation dryer (3) is arranged at the top of the gas-fired rotary roasting furnace (9), a natural gas input pipe and an air input pipe with a combustion-supporting fan (6) are respectively connected with a hearth, and the tail part of the hearth is connected with a cooling section (10); the outer wall of the cooling section (10) is provided with a spray cooling pipe which is respectively connected with a cooling water feeding pipe and a cooling water return pipe; and an iron phosphate output pipe is arranged at the bottom of one side of the cooling section (10).
2. The system for efficiently and continuously producing anhydrous iron phosphate according to claim 1, wherein: the smooth finish of the inner wall surface of the gas type rotary roasting furnace (9) is 0.4 micron.
3. A method for efficiently and continuously producing anhydrous iron phosphate comprises the following steps:
the method comprises the steps that a dihydrate iron phosphate filter cake containing a large amount of free water is conveyed into a feeding screw (2) through an arch breaking feeding barrel (1), and enters a rotary flash drying machine (3) through the feeding screw (2), so that pre-dried dihydrate iron phosphate is obtained;
secondly, the pre-dried ferric phosphate dihydrate enters a bag-type dust remover (4) along with tail gas, and compressed nitrogen is input into the bag-type dust remover (4) to obtain wet tail gas and the pre-dried ferric phosphate dihydrate after dust removal respectively after gas-solid separation; the moisture-containing tail gas is exhausted by a draught fan (7);
thirdly, the pre-dried ferric phosphate after dust removal enters a feed inlet of a gas type rotary roasting furnace (9) through a rotary discharge valve (5), meanwhile, natural gas is input into a hearth of the gas type rotary roasting furnace (9), air is input through a combustion fan (6), and high-temperature roasting is carried out at the temperature of 600-800 ℃, so that roasted anhydrous ferric phosphate and heat-exchanged high-temperature flue gas are obtained respectively; the high-temperature flue gas after heat exchange returns to the rotary flash dryer (3) through a four-way valve (8) to pre-dry the high-moisture material;
and fourthly, the roasted anhydrous ferric phosphate enters a cooling section (10) and is cooled in a mode that cooling water is sprayed on the outer wall of the cooling section, and the cooled ferric phosphate is obtained.
CN202110018193.3A 2021-01-07 2021-01-07 System and method for efficiently and continuously producing anhydrous iron phosphate Pending CN112707377A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114322540A (en) * 2022-02-28 2022-04-12 山东宝阳干燥设备科技有限公司 Special roasting system for lithium iron phosphate reclaimed materials
CN114909874A (en) * 2022-05-07 2022-08-16 天华化工机械及自动化研究设计院有限公司 Method for drying dihydrate ferric phosphate by multistage Venturi circulation superheated steam

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Publication number Priority date Publication date Assignee Title
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CN205275222U (en) * 2015-09-23 2016-06-01 北方稀土生一伦高科技有限公司 Improve calcination device of carbonic acid tombarthite daily output
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CN107324670A (en) * 2017-07-24 2017-11-07 辽宁东和新材料股份有限公司 One kind produces oxide of high activity magnesium apparatus using magnesite tailings
CN108731429A (en) * 2018-06-15 2018-11-02 山东鲁北企业集团总公司 A kind of ferric phosphate continuous dehydration and crystal form controllable system and its control method
CN208704423U (en) * 2018-07-06 2019-04-05 中南大学 The microwave-assisted dynamic continuous calcining equipment of lithium ion battery material
CN210486365U (en) * 2019-07-04 2020-05-08 湘潭电化科技股份有限公司 System for drying iron phosphate by using waste heat of roasting furnace

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114322540A (en) * 2022-02-28 2022-04-12 山东宝阳干燥设备科技有限公司 Special roasting system for lithium iron phosphate reclaimed materials
CN114909874A (en) * 2022-05-07 2022-08-16 天华化工机械及自动化研究设计院有限公司 Method for drying dihydrate ferric phosphate by multistage Venturi circulation superheated steam

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Application publication date: 20210427