Dynamic crystallization kiln for lithium iron phosphate
By using a dynamic crystallization kiln during the sintering process of lithium iron phosphate, by adjusting the inclination and rotation speed of the sintering cylinder and optimizing the nitrogen utilization rate, the problems of long sintering time, high energy consumption and many equipment failures in the prior art are solved, and the problem of long sintering time, high energy consumption and many equipment failures is achieved. More uniform sintering and cost reduction are achieved, improving the performance of lithium iron phosphate finished products.
Patent Information
- Application Number
- CN202420540711.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-20
AI Technical Summary
The existing lithium iron phosphate sintering devices have problems such as long sintering time, high energy consumption, uneven product quality, huge equipment, many mechanical failures, high maintenance costs, easy materials to agglomerate and insufficient sintering.
The lithium iron phosphate dynamic crystallization kiln is adopted, including a feeding chamber, a sintering chamber and a discharge chamber. The sintering chamber is equipped with a sintering cylinder and a heating device. The inclination and rotation speed of the sintering cylinder are adjusted through lifting and rotating devices to optimize the nitrogen utilization rate. Reduce the number of equipment and space waste.
It has achieved shortened sintering time, reduced cost, improved product performance, reduced equipment failure rate, uniform sintering and efficient collection of materials, reducing nitrogen consumption and production costs.
Smart Images
Figure CN222279271U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a sintering device for battery materials, in particular to a lithium iron phosphate dynamic crystallization kiln. Background Art
[0002] At present, the commonly used sintering devices for lithium iron phosphate, the positive electrode material of lithium batteries, mainly include push plate kilns, tunnel kilns, etc., using graphite saggers as material carriers for sintering together with lithium iron phosphate materials. During the sintering process, the heating time is long, the sintering space is large, and a large amount of replacement gas is required, which has high energy consumption and nitrogen consumption; the material is easy to agglomerate, the sintering is insufficient, and the quality of the product is uneven; the graphite sagger is prone to powder spraying, causing material pollution and waste, and the production cannot be carried out continuously, which increases the cost of production line maintenance. At the same time, the low reuse rate of graphite saggers increases production costs; the sintering process requires protective gas and cooling devices, which makes the sintering equipment too large, mechanical failures are relatively frequent, and the equipment maintenance cost is high. Utility Model Content
[0003] Purpose of the utility model: The purpose of the utility model is to reduce the sintering time and cost, improve the performance of lithium iron phosphate products, and provide a lithium iron phosphate dynamic crystallization kiln.
[0004] Technical solution: The lithium iron phosphate dynamic crystallization kiln described in the utility model includes a feeding chamber, a sintering chamber and a discharging chamber. The sintering chamber is provided with a sintering cylinder for sintering materials, and the inner wall of the sintering chamber is provided with a heating device; a lifting device for adjusting the inclination of the sintering cylinder is provided below the sintering chamber; the feeding chamber and the discharging chamber are provided with a rotating device for driving the sintering cylinder to rotate.
[0005] Furthermore, the rotating device drives the sintering cylinder to rotate at a uniform speed to ensure that the lithium iron phosphate precursor is evenly heated during the sintering process and to ensure the performance of the finished product; the lifting device adjusts the inclination of the sintering cylinder so that the sintered finished product can slide quickly and smoothly to the collecting device for easy collection of the finished product, and at the same time prevent the finished product from staying in the sintering cylinder for too long, causing over-sintering and affecting the performance of the product.
[0006] Furthermore, the feed chamber, sintering chamber and discharge chamber are independently sealed, and nitrogen enters directly into the sintering cylinder through the air inlet, without wasting extra space for replacing gas, thereby improving the utilization rate of nitrogen.
[0007] Furthermore, the adjustment range of the inclination of the feed end and the discharge end of the sintering cylinder is 0-30°, and the feed end of the sintering cylinder is higher than the discharge end, which facilitates the sintered finished products to slide quickly and smoothly to the collecting device for convenient collection of the finished products. At the same time, it can prevent the finished products from staying in the sintering cylinder for too long, causing excessive sintering and affecting the performance of the product.
[0008] Furthermore, the sintering chamber is divided into a heating zone, a constant temperature zone and a cooling zone. By adjusting the lifting device at the bottom of the sintering chamber to control the inclination and rotation speed of the sintering cylinder, the material passes through different temperature zones in sequence within a specified time for pre-sintering, calcining and cooling.
[0009] Furthermore, the feed chamber also includes a feed device and an air inlet connected to the sintering cylinder.
[0010] Furthermore, the discharge chamber also includes a material receiving device and an air outlet connected to the sintering cylinder.
[0011] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. The kiln equipment is less, the volume is small, the space utilization rate is high, and the equipment failure rate is low; 2. No graphite sagger is used as a carrier, which reduces the loss of materials and the frequency of production line maintenance, and improves production efficiency; 3. The sintering space is integrated, which reduces the waste of materials, makes the materials sintered more evenly, and improves the quality of the products; 4. It is convenient to control the sintering time of the materials, and the material collection method is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0013] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.
[0014] like Figure 1 The present invention provides a lithium iron phosphate dynamic crystallization kiln, comprising a feed chamber 1, a sintering chamber 4 and a discharge chamber 6. The sintering chamber 4 is divided into a temperature rising zone, a constant temperature zone and a temperature falling zone. The sintering chamber 4 is provided with a sintering cylinder 8 for material sintering, and a heating device 12 is provided on the inner wall of the sintering chamber 4. The front end of the bottom of the sintering chamber 4 is provided with a first lifting device 11 for adjusting the inclination of the sintering cylinder, and the rear end is provided with a second lifting device 13 for adjusting the inclination of the sintering cylinder. The feed end of the sintering cylinder 8 is higher than the discharge end, and the adjustment range of the inclination between the feed end and the discharge end is 0-30°. The feed chamber 1 includes a feed device 2 and an air inlet 3 connected to the sintering cylinder 8, and is provided with a first rotating device 10 for driving the sintering cylinder 8 to rotate. The discharge chamber 6 includes a receiving device 15 and an air outlet 5 connected to the sintering cylinder 8, and is provided with a second rotating device 14 for driving the sintering cylinder 8 to rotate. The feed chamber 1, the sintering chamber 4 and the discharge chamber 6 are sealed independently from each other.
[0015] The above-mentioned lithium iron phosphate dynamic crystallization kiln is used to produce materials, and the heating device is adjusted to heat up for 2 hours and keep warm for 2 hours to reach the target temperature. The lithium iron phosphate precursor is fed into the sintering cylinder 8 through the feeding device 2; the chain-type first rotating device 10 and the second rotating device 14 are started, and the air inlet 3 is opened to introduce nitrogen, and the nitrogen flow rate is set to 50Nm 3 / h, open the exhaust fan at the exhaust port 5 to extract the exhaust gas; adjust the first lifting device 11 at the front end of the sintering chamber and the second lifting device 13 at the rear end to control the inclination of the sintering tube, and adjust the first rotating device 10 and the second rotating device 14 to control the rotation speed of the sintering tube so that the material passes through different temperature zones for pre-sintering, calcining and cooling in the specified time, and the time is 8 hours. After the sintering is completed, adjust the first lifting device 11 at the front end of the sintering chamber 4 and the second lifting device 13 at the rear end so that the inclination of the sintering tube 8 is 16°, the feed end is higher than the discharge end, so that the sintered finished product slides smoothly into the receiving device 15. Sintering the same lithium iron phosphate finished product through the above device saves about 1,000 yuan / ton in electricity, about 50 yuan / ton in nitrogen, and 500 yuan / ton in sagger consumption. It has less equipment, small size, low failure rate, and high production efficiency; the sintering is more uniform, and the performance of the lithium iron phosphate finished product has been improved: 0.1C charging 165mAh / g, 0.1C discharge 163mAh / g.
Claims
1. A lithium iron phosphate dynamic crystallization kiln, comprising a feeding chamber (1), a sintering chamber (4) and a discharging chamber (6), characterized in that: The sintering chamber (4) is provided with a sintering cylinder (8) for sintering materials, and the inner wall of the sintering chamber (4) is provided with a heating device (12); a lifting device for adjusting the inclination of the sintering cylinder (8) is provided below the sintering chamber (4), and the adjustment range of the inclination of the feeding end (7) and the discharging end (9) of the sintering cylinder (8) is 0-30°; the feeding chamber (1) and the discharging chamber (6) are provided with a rotating device for driving the sintering cylinder (8) to rotate; the sintering chamber (4) is divided into a temperature rising zone, a constant temperature zone and a temperature falling zone.
2. The lithium iron phosphate dynamic crystallization furnace according to claim 1, characterized in that: The feed chamber (1), sintering chamber (4) and discharge chamber (6) are sealed independently of each other.
3. The lithium iron phosphate dynamic crystallization kiln according to claim 1, characterized in that: The feed end (7) of the sintering cylinder (8) is higher than the discharge end (9).
4. The lithium iron phosphate dynamic crystallization kiln according to claim 1, characterized in that: The feed chamber (1) further comprises a feed device (2) and an air inlet (3) connected to the sintering cylinder (8).
5. The lithium iron phosphate dynamic crystallization kiln according to claim 1, characterized in that: The discharge chamber (6) further comprises a material receiving device (15) and a gas outlet (5) connected to the sintering cylinder (8).