A vertical powder phase change furnace device and use method

Abstract

The present invention relates to a vertical powder phase change furnace device and a method for using the same. The device includes a furnace body, a feed pipe is arranged on the top cover of the furnace body, a discharge pipe is arranged on the bottom plate of the furnace body, and a limited flow valve is arranged on the discharge pipe; a support is welded on the outer wall of the furnace body; a plurality of weighing sensors are arranged circumferentially below the support, and the weighing sensors are located on a steel beam; a material cone is arranged on the bottom plate inside the furnace body, a plurality of discharge holes are opened on the side of the material cone, and the discharge pipe is connected to the material cone; a plurality of air nozzles pass through the bottom plate and enter the furnace body and are arranged in an annular manner along the material cone, each air nozzle is connected to an air branch pipe, each air branch pipe is equipped with an automatic valve, and all air branch pipes are connected to the main pipe. The present invention can reduce investment, reduce energy consumption, save space, and solve the problem of serious pollution; it is not easy to agglomerate, and improves the economic benefits of the enterprise.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy, and in particular relates to a vertical powder phase change furnace device and a use method thereof. Background Art

[0002] In recent years, the rapid development of new energy vehicles and electronic products has led to an increasing demand for lithium-containing products, and lithium-containing ores are one of the main sources of lithium-containing products. At present, one of the steps in extracting lithium-containing ores is to calcine the lithium-containing ores at high temperatures to transform the crystal form, and the equipment for crystal form transformation of lithium-containing ores mostly uses rotary kilns or vertical furnaces. However, the disadvantages of these two types of equipment are: large investment, high energy consumption, large land occupation, serious pollution, difficult to control roasting temperature, and easy agglomeration.

[0003] A Chinese patent (publication number: CN113776335A, publication date: December 11, 2021) discloses "a phase change furnace for preparing high-temperature alumina powder and a method of use", but still has the following disadvantages: short residence time, low crystal conversion rate, high use of fluidizing air, and large temperature loss of high-temperature materials. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a vertical powder phase change furnace device and a method of use, which can reduce the roasting temperature, improve the heat utilization rate, avoid agglomeration, and reduce heat loss in the phase change reactor for extracting lithium-containing products from lithium-containing ores.

[0005] A vertical powder phase change furnace device comprises a furnace body, wherein a feed pipe for materials to enter the furnace body is arranged on the top cover of the furnace body, and the feed pipe is communicated with the furnace body; a discharge pipe is arranged on the bottom plate of the furnace body, and a flow limiting valve is arranged on the discharge pipe, and the flow limiting valve is electrically connected to a computer; a support is welded on the outer wall of the furnace body, and the support is an annular skirt seat; a plurality of weighing sensors are arranged circumferentially below the support, and the weighing sensors are located on a steel beam; the weighing sensors are electrically connected to a computer; a material cone is arranged on the bottom plate inside the furnace body, and the material cone is a hollow cone structure, and is small at the top and large at the bottom, and is placed in the furnace body with the large mouth facing downward; a plurality of discharge holes are opened on the side of the material cone, and the discharge pipe is communicated with the material cone; a plurality of air nozzles pass through the bottom plate into the furnace body, and are arranged on the bottom plate at the annular gap between the cone and the material cone, and are arranged in an annular manner; each air nozzle is communicated with an air branch pipe, and each air branch pipe is equipped with an automatic valve, and all air branch pipes are collectively connected to the main pipe; the automatic valve is electrically connected to the computer.

[0006] The furnace body is of two sections, including a cylinder at the upper part and a cone at the lower part. The cone is of a structure that is larger at the top and smaller at the bottom. The upper opening of the cone is connected to the lower opening of the cylinder, and the lower opening is connected to the bottom plate.

[0007] The number of weighing sensors is 3~4.

[0008] The air nozzles are composed of air caps, and the center distance between each air nozzle is 100-200 mm.

[0009] The number of the discharge holes is an odd number, the sum of the cross-sectional areas of the discharge holes is twice the cross-sectional area of ​​the discharge pipe, and the cross-sectional areas of the various discharge holes are equal.

[0010] The method for using the vertical powder phase change furnace device mentioned above specifically comprises the following steps:

[0011] Step 1: Calibrate the weighing sensor when there is no material in the furnace, and set the weight of the furnace itself to zero;

[0012] Step 2: The high-temperature material continuously enters the furnace body through the feed pipe and performs free fall motion in the furnace body until it reaches the bottom of the furnace body;

[0013] Step 3: Convert the required residence time of the high-temperature material in the furnace body into the weight of the high-temperature material. The weight of the high-temperature material = the volume of the phase change furnace × (residence time ÷ 60 minutes) × the bulk density of the material; then control the residence time through the weight displayed by the weighing sensor; the residence time of the high-temperature material in the furnace body is 5~40min, which is adjusted by changing the opening size of the flow limiting valve. When the weight of the high-temperature material in the furnace body is less than the corresponding residence time, close the flow limiting valve; when the weight of the high-temperature material in the furnace body is greater than the corresponding residence time, open the flow limiting valve, and repeat this step to ensure the residence time of the high-temperature material in the furnace body;

[0014] Step 4: When the high-temperature material reaches the weight corresponding to the required residence time, open the flow limiting valve, and the high-temperature material enters the discharge pipe through the discharge hole on the material cone, and then flows out of the furnace through the flow limiting valve and is sent to other equipment;

[0015] Step 5: When the high-temperature material cannot be discharged smoothly through the discharge hole of the material cone, the automatic valve is opened through computer remote control, and the pressurized gas enters each wind branch pipe through the main pipe, and then enters the wind nozzle. The pressurized gas ejected from the wind nozzle destroys the repose angle of the high-temperature material around the material cone, so that the high-temperature material flows smoothly, and then smoothly passes through the discharge hole of the material cone into the discharge pipe and is discharged from the furnace body;

[0016] Step 6: When the high-temperature material entering through the feed pipe is constant, but the weight of the high-temperature material in the furnace body gradually decreases, close the limiting valve to reduce the discharge amount of the high-temperature material in the furnace body;

[0017] Step 7: Repeat steps 5 and 6 until the reaction is complete;

[0018] The high temperature material in step 2 is spodumene or lepidolite, with a particle size of 10-500 μm and a grade of 1%-5%;

[0019] When the high-temperature material is spodumene, the temperature entering the furnace body is 1000~1100℃; when the high-temperature material is lepidolite, the temperature entering the furnace body is 800~1000℃.

[0020] When the high-temperature material is spodumene, the pressurized gas in step five is air, nitrogen or other gases that are easily available, low in cost, do not react with mineral powder and are safe to use; when the high-temperature material is lepidolite, the pressurized gas is steam or other gases that are easily available, low in cost, do not react with mineral powder and are safe to use; the flow rate of the pressurized gas ejected from the nozzle is 5~90m / s.

[0021] The step five is an intermittent operation. When the high-temperature material flows out smoothly, the automatic valve is closed to cut off the entry of the pressurized gas.

[0022] The beneficial effects of the present invention are: the present invention can reduce investment, reduce energy consumption, save land, solve the problem of serious pollution; it is not easy to agglomerate, and improve the economic benefits of enterprises. With the improvement and severity of environmental awareness in today's society, the traditional roasting method of lithium-containing ores will eventually be phased out, and will be replaced by the new, energy-saving, and environmentally friendly mineral powder phase change device of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a vertical powder phase change furnace device provided by the present invention;

[0024] in,

[0025] 1-feed pipe, 2-furnace body, 2-1-top cover, 2-2-cylinder, 2-3-cone, 2-4-bottom plate, 3-support, 4-weighing sensor, 5-material cone, 5-1-discharge hole, 6-air nozzle, 7-automatic valve, 8-air branch pipe, 9-main pipe, 10-discharge pipe, 11-flow limiting valve, 12-steel beam. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0027] like Figure 1As shown, a vertical powder phase change furnace device includes a furnace body 2, and the furnace body 2 allows the maximum residence time of high-temperature materials to reach 40 minutes; a feed pipe 1 for materials to enter the furnace body 2 is arranged on the top cover 2-1 of the furnace body 2, and the feed pipe 1 is communicated with the inside of the furnace body 2; a discharge pipe 10 is arranged on the bottom plate 2-4 of the furnace body 2, and a flow limiting valve 11 is arranged on the discharge pipe 10, and the flow limiting valve 11 is electrically connected to a computer, and remote control operation is realized through the computer. The furnace body 2 is a two-stage type, including a cylinder 2-2 located at the upper part and a cone 2-3 located at the lower part, and the cone 2-3 is a structure of a large upper part and a small lower part, and the upper opening of the cone 2-3 is connected to the lower opening of the cylinder 2-2, and the lower opening is connected to the bottom plate 2-4. The outer wall of the furnace body 2 is welded with a support 3, which is a ring-shaped skirt seat welded on the outer wall of the cylinder 2-2; a plurality of weighing sensors 4 are arranged circumferentially below the support, and the weighing sensors 4 are located on the steel beam 12, the number of which is 3 to 4, and the number of the weighing sensors 4 in this embodiment is 4. The weighing sensors 4 are electrically connected to the computer, and the weighing sensors 4 transmit the monitored data to the computer, so as to realize remote control and monitoring through the computer.

[0028] A material cone 5 is arranged on the bottom plate 2-4 inside the furnace body 2. The material cone 5 is a hollow cone structure, which is small at the top and large at the bottom, and is placed in the furnace body 2 with the large opening facing downward. A plurality of discharge holes 5-1 are opened on the side of the material cone 5, and the discharge pipe 10 is connected to the material cone 5. Several air nozzles 6 pass through the bottom plate 2-4 into the furnace body 2, and are arranged on the bottom plate 2-4 at the annular gap between the cone 2-3 and the material cone 5, in a ring-shaped arrangement. Each air nozzle 6 is connected to an air branch pipe 8, and each air branch pipe 8 is equipped with an automatic valve 7, and all air branch pipes 8 are connected to the main pipe 9. The automatic valve 7 is electrically connected to a computer, and remote control operation is realized through the computer. The air nozzle 6 is composed of a wind cap, and the center distance of each air nozzle 5 is 100~200mm.

[0029] The number of the discharge holes 5-1 is an odd number, and in this embodiment, the number of the discharge holes 5-1 is 3; the sum of the cross-sectional areas of the discharge holes 5-1 is twice the cross-sectional area of ​​the discharge pipe, and the cross-sectional areas of the various discharge holes 5-1 are equal.

[0030] The device provided by the present invention is a closed vertical device, which ensures that the high-temperature lithium-containing ore has sufficient residence time in the device to achieve the crystal transformation of the lithium-containing ore material, and provides qualified raw materials for subsequent processes. The lithium-containing ore is spodumene or lepidolite. When spodumene is used as a raw material, the spodumene is transformed from an α crystal form to a β crystal form in the device; when lepidolite is used as a raw material, the lepidolite is removed from fluorine in the device.

[0031] Example 1

[0032] The method for using the vertical powder phase change furnace device described above, taking spodumene as an example in this embodiment, the temperature entering the furnace body 2 is 1000-1100°C, the particle size is 10-500μm, and the grade is 1%-5%. Specifically, the following steps are included:

[0033] Step 1: When there is no material in the furnace body 2, the weighing sensor 4 is calibrated to set the weight of the furnace body to zero.

[0034] Step 2: The high-temperature material continuously enters the furnace body 2 through the feed pipe 1 and performs free fall motion in the furnace body 2 until it reaches the bottom of the furnace body 2.

[0035] Step 3: Convert the required residence time of the high-temperature material in the furnace body 2 into the weight of the high-temperature material. The weight of the high-temperature material = the volume of the phase change furnace × (residence time ÷ 60 minutes) × the bulk density of the material; and then control the residence time by the weight displayed by the weighing sensor 4. The residence time of the high-temperature material in the furnace body is 5-40 minutes, which is adjusted by changing the opening size of the flow limiting valve 11. When the weight of the high-temperature material in the furnace body 2 is less than the corresponding residence time, the flow limiting valve 11 is closed; when the weight of the high-temperature material in the furnace body 2 is greater than the corresponding residence time, the flow limiting valve 11 is opened. This step is repeated to ensure the residence time of the high-temperature material in the furnace body 2.

[0036] Step 4: When the high-temperature material reaches the weight corresponding to the required residence time, the limiting valve 11 is opened, and the high-temperature material enters the discharge pipe 10 through the discharge hole 5-1 on the material cone 5, and then flows out of the furnace body 2 through the limiting valve 11 and is sent to other equipment.

[0037] Step 5: When the high-temperature material is not discharged smoothly through the discharge hole 5-1 of the material cone 5, the automatic valve 7 is opened by remote control of the computer, and the pressurized gas enters each wind branch pipe 8 through the main pipe 9, and then enters the tuyere 6. The pressurized gas ejected from the tuyere 6 destroys the repose angle of the high-temperature material around the material cone 5, so that the high-temperature material flows smoothly, and then smoothly passes through the discharge hole 5-1 of the material cone 5 into the discharge pipe 10 and is discharged from the furnace body 2. The pressurized gas is air, nitrogen or other gas that is easy to obtain, low in cost, does not react with mineral powder and is safe to use. In this embodiment, the flow rate of the pressurized gas ejected from the tuyere 6 is 10m / s.

[0038] This step is an intermittent operation. When the high-temperature material flows out smoothly, the automatic valve 7 is closed to cut off the entry of pressurized gas.

[0039] Step 6: When the high-temperature material entering through the feed pipe 1 is constant, but the weight of the high-temperature material in the furnace body 2 gradually decreases, close the limiting valve 11 to reduce the discharge amount of the high-temperature material in the furnace body 2.

[0040] Step 7: Repeat steps 5 and 6 until the reaction is complete.

[0041] The method provided by the present invention enables the crystal transformation rate of spodumene to reach more than 90%.

[0042] Example 2

[0043] The method for using the vertical powder phase change furnace device mentioned above, taking lepidolite as an example in this embodiment, the temperature entering the furnace body 2 is 800-1000°C, the particle size is 10-500μm, and the grade is 1%-5%. Specifically, the following steps are included:

[0044] Step 1: When there is no material in the furnace body 2, the weighing sensor 4 is calibrated to set the weight of the furnace body to zero.

[0045] Step 2: The high-temperature material continuously enters the furnace body 2 through the feed pipe 1 and performs free fall motion in the furnace body 2 until it reaches the bottom of the furnace body 2.

[0046] Step 3: Convert the required residence time of the high-temperature material in the furnace body 2 into the weight of the high-temperature material. The weight of the high-temperature material = the volume of the phase change furnace × (residence time ÷ 60 minutes) × the bulk density of the material; and then control the residence time by the weight displayed by the weighing sensor 4. The residence time of the high-temperature material in the furnace body is 5-40 minutes, which is adjusted by changing the opening size of the flow limiting valve 11. When the weight of the high-temperature material in the furnace body 2 is less than the corresponding residence time, the flow limiting valve 11 is closed; when the weight of the high-temperature material in the furnace body 2 is greater than the corresponding residence time, the flow limiting valve 11 is opened. This step is repeated to ensure the residence time of the high-temperature material in the furnace body 2.

[0047] Step 4: When the high-temperature material reaches the weight corresponding to the required residence time, the limiting valve 11 is opened, and the high-temperature material enters the discharge pipe 10 through the discharge hole 5-1 on the material cone 5, and then flows out of the furnace body 2 through the limiting valve 11 and is sent to other equipment.

[0048] Step 5: When the high-temperature material is not discharged smoothly through the discharge hole 5-1 of the material cone 5, the automatic valve 7 is opened by remote control of the computer, and the pressurized gas enters each wind branch pipe 8 through the main pipe 9, and then enters the tuyere 6. The pressurized gas ejected from the tuyere 6 destroys the repose angle of the high-temperature material around the material cone 5, so that the high-temperature material flows smoothly, and thus smoothly passes through the discharge hole 5-1 of the material cone 5 into the discharge pipe 10 and is discharged from the furnace body 2. The pressurized gas is steam or other gas that is easy to obtain, low in cost, does not react with mineral powder, and is safe to use. In this embodiment, the flow rate of the pressurized gas ejected from the tuyere 6 is 10m / s.

[0049] This step is an intermittent operation. When the high-temperature material flows out smoothly, the automatic valve 7 is closed to cut off the entry of pressurized gas.

[0050] Step 6: When the high-temperature material entering through the feed pipe 1 is constant, but the weight of the high-temperature material in the furnace body 2 gradually decreases, close the limiting valve 11 to reduce the discharge amount of the high-temperature material in the furnace body 2.

[0051] Step 7: Repeat steps 5 and 6 until the reaction is complete.

[0052] The method provided by the invention enables the defluorination rate of lithium mica to reach 85%.

Claims

1. A vertical powder phase change furnace device, characterized in that: It comprises a furnace body, a top cover of the furnace body is provided with a feed pipe for materials to enter the furnace body, and the feed pipe is communicated with the inside of the furnace body; a discharge pipe is provided on the bottom plate of the furnace body, and a flow limiting valve is provided on the discharge pipe, and the flow limiting valve is electrically connected to a computer; a support is welded on the outer wall of the furnace body, and the support is a ring-shaped skirt seat; a plurality of weighing sensors are arranged circumferentially below the support, and the weighing sensors are located on a steel beam; the weighing sensors are electrically connected to a computer; the residence time required for high-temperature materials in the furnace body is converted into the weight of the high-temperature materials, and the weight of the high-temperature materials = the volume of the phase change furnace × (residence time ÷ 60 minutes) × the bulk density of the materials, and the residence time is controlled by the weight displayed by the weighing sensor; a material cone is provided on the bottom plate inside the furnace body, and the material cone is a hollow cone structure, and is small at the top and large at the bottom, and is placed in the furnace body with the large mouth facing downward; There are multiple discharge holes on the side of the material cone, and the discharge pipe is connected to the material cone; a number of air nozzles pass through the bottom plate into the furnace body, and are arranged on the bottom plate at the annular gap between the cone and the material cone, in a circular arrangement; each air nozzle is connected to an air branch pipe, each air branch pipe is equipped with an automatic valve, and all air branch pipes are connected to the main pipe; the automatic valve is electrically connected to the computer; The furnace body is a two-stage type, including a cylinder at the upper part and a cone at the lower part, the cone is a structure of being larger at the top and smaller at the bottom, the upper opening of the cone is connected to the lower opening of the cylinder, and the lower opening is connected to the bottom plate; The number of weighing sensors is 3~4; The air nozzle is composed of an air cap, and the center distance between each air nozzle is 100-200 mm; The number of the discharge holes is an odd number, the sum of the cross-sectional areas of the discharge holes is twice the cross-sectional area of ​​the discharge pipe, and the cross-sectional areas of the various discharge holes are equal.

2. The method for using a vertical powder phase change furnace device according to claim 1, characterized in that: The specific steps include: Step 1: Calibrate the weighing sensor when there is no material in the furnace, and set the weight of the furnace itself to zero; Step 2: The high-temperature material continuously enters the furnace body through the feed pipe and performs free fall motion in the furnace body until it reaches the bottom of the furnace body; Step 3: Convert the required residence time of the high-temperature material in the furnace body into the weight of the high-temperature material. The weight of the high-temperature material = the volume of the phase change furnace × (residence time ÷ 60 minutes) × the bulk density of the material; then control the residence time through the weight displayed by the weighing sensor; the residence time of the high-temperature material in the furnace body is 5~40min, which is adjusted by changing the opening size of the flow limiting valve. When the weight of the high-temperature material in the furnace body is less than the corresponding residence time, close the flow limiting valve; when the weight of the high-temperature material in the furnace body is greater than the corresponding residence time, open the flow limiting valve, and repeat this step to ensure the residence time of the high-temperature material in the furnace body; Step 4: When the high-temperature material reaches the weight corresponding to the required residence time, open the flow limiting valve, and the high-temperature material enters the discharge pipe through the discharge hole on the material cone, and then flows out of the furnace through the flow limiting valve and is sent to other equipment; Step 5: When the high-temperature material cannot be discharged smoothly through the discharge hole of the material cone, the automatic valve is opened through computer remote control, and the pressurized gas enters each wind branch pipe through the main pipe, and then enters the wind nozzle. The pressurized gas ejected from the wind nozzle destroys the repose angle of the high-temperature material around the material cone, so that the high-temperature material flows smoothly, and then smoothly passes through the discharge hole of the material cone into the discharge pipe and is discharged from the furnace body; Step 6: When the high-temperature material entering through the feed pipe is constant, but the weight of the high-temperature material in the furnace body gradually decreases, close the limiting valve to reduce the discharge amount of the high-temperature material in the furnace body; Step 7: Repeat steps 5 and 6 until the reaction is complete.

3. The method for using a vertical powder phase change furnace device according to claim 2, characterized in that: The high temperature material in step 2 is spodumene or lepidolite, with a particle size of 10-500 μm and a grade of 1%-5%.

4. The method for using a vertical powder phase change furnace device according to claim 3, characterized in that: When the high-temperature material is spodumene, the temperature entering the furnace body is 1000~1100℃; when the high-temperature material is lepidolite, the temperature entering the furnace body is 800~1000℃.

5. The method for using a vertical powder phase change furnace device according to claim 3, characterized in that: When the high-temperature material is spodumene, the pressurized gas in step five is air, nitrogen or other gases that are easily available, low in cost, do not react with mineral powder and are safe to use; when the high-temperature material is lepidolite, the pressurized gas is steam or other gases that are easily available, low in cost, do not react with mineral powder and are safe to use; the flow rate of the pressurized gas ejected from the nozzle is 5~90m / s.

6. The method for using a vertical powder phase change furnace device according to claim 2, characterized in that: The step five is an intermittent operation. When the high-temperature material flows out smoothly, the automatic valve is closed to cut off the entry of the pressurized gas.

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