Tunnel kiln equipment for preparing lithium carbonate

Abstract

The utility model discloses tunnel kiln equipment for preparing lithium carbonate, which relates to the technical field of tunnel kiln lithium carbonate preparation, when the tunnel kiln equipment is used, a kiln car enters a drying kiln part, a firing tunnel kiln part and a cooling kiln part in sequence, and a tunnel kiln is adopted for roasting, so that the handling capacity can be improved, the production efficiency can be improved, and the transformation rate of raw material roasting can be effectively improved. The burner is adopted for heating, the waste heat ventilation pipeline is used for recycling heat energy and supplying heat to the drying kiln part, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of preparing lithium carbonate using a tunnel kiln, in particular to a tunnel kiln device for preparing lithium carbonate. Background Art

[0002] As an important metal element, lithium has a wide range of applications in industry. Lithium carbonate is a basic lithium salt compound of lithium and an important basic raw material for the preparation of other lithium salts, such as LiCl, LiBr, LiFePO4, etc. Among them, the most widely used application is the production of lithium-ion batteries. With the vigorous development of the new energy industry, the demand for lithium resources continues to increase. How to efficiently, environmentally friendly and economically extract lithium from lithium-containing ores has become an urgent problem to be solved in the development of the lithium-ion new energy industry. my country has rich reserves of lithium mica. How to efficiently and economically extract lithium and other valuable metals from lithium mica has become a difficult problem and research focus that urgently needs to be solved in the comprehensive processing of lithium mica.

[0003] For preparing lithium carbonate using lithium mica as raw material, there are currently lime method, sulfuric acid method and chlorination method processes, but all of them have the disadvantages of low conversion rate of roasted lithium, low lithium leaching rate, low lithium yield, high requirements for equipment corrosion protection, and high energy consumption. In order to more efficiently improve the yield of the final product lithium carbonate, the utility model proposes a tunnel kiln equipment for preparing lithium carbonate. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a tunnel kiln equipment for preparing lithium carbonate.

[0005] The utility model provides a tunnel kiln device for preparing lithium carbonate, comprising a kiln and a kiln car track, the kiln car runs on the kiln car track, a plurality of burners are connected in the kiln, the burners are used for heating, a conveying mechanism is provided in the kiln, and the conveying mechanism is used to transport the pressed lithium mica into the kiln;

[0006] The kiln is connected with a heat supply main pipe, and the kiln is connected with a waste heat ventilation duct, and the waste heat ventilation duct is used to recover heat energy and is used for partial heating of the kiln.

[0007] Preferably, the conveying mechanism comprises a kiln track, which is installed in the kiln furnace, a kiln car is provided on the kiln track, the kiln car slides on the kiln track, a refractory part is installed on the kiln car, a plurality of stacking parts are installed on the refractory part, and the stacking parts are stackers.

[0008] Preferably, the refractory member is a refractory brick.

[0009] Preferably, a dehumidification fan is installed on the kiln, and a fan system is installed on the kiln, and the fan system is used to introduce air.

[0010] Preferably, the burner is an energy-saving low-nitrogen burner, and the burner is connected to an external energy supply device, such as natural gas.

[0011] Preferably, the kiln includes a drying kiln part, a firing tunnel kiln part and a cooling kiln part. When in use, the kiln car enters the drying kiln part, the firing tunnel kiln part and the cooling kiln part in sequence. The drying kiln part, the firing tunnel kiln part and the cooling kiln part are connected in sequence. The dehumidification fan is installed on the drying kiln part. The heating main pipe provides heat for the drying kiln part. The heating main pipe is the existing technology. The waste heat ventilation duct is used to recover heat energy and is used for partial heating of the drying kiln part. The number of the fan systems is set to two, and they are respectively installed on the firing tunnel kiln part and the cooling kiln part.

[0012] Preferably, a kiln door is installed on the drying kiln part, and the kiln door is used to prevent the exhaust gas from overflowing, and the kiln door is a manual double-opening kiln door.

[0013] Preferably, the interior of the kiln is made of refractory material.

[0014] Preferably, the drying kiln part is sealed internally with a curved shape, and the drying kiln part is built with bricks to ensure tight sealing.

[0015] Preferably, the fan system includes a smoke exhaust fan, a combustion-supporting fan, a rapid cooling fan, a rapid cooling heat extraction fan, a slow cooling heat extraction fan, a tail cooling fan, an axle cooling fan, a tail air curtain fan and an undercarriage fan.

[0016] Preferably, the length ratios of the drying kiln part, the firing tunnel kiln part and the cooling kiln part are 10-20%, 40-45% and 40-45% respectively.

[0017] Preferably, the length ratios of the drying kiln part, the firing tunnel kiln part and the cooling kiln part are 10.91%, 46.32% and 42.73% respectively.

[0018] In the utility model, the proposed tunnel kiln equipment for preparing lithium carbonate has the following beneficial technical effects:

[0019] When in use, the kiln car enters the drying kiln part, the firing tunnel kiln part and the cooling kiln part in sequence. Using the tunnel kiln for roasting can increase the processing capacity, improve production efficiency, and effectively increase the conversion rate of raw material roasting, thereby increasing the yield of the final product lithium carbonate. Burners are used for heating, and the waste heat ventilation duct is used to recover heat energy and used for partial heating of the drying kiln part to reduce energy consumption.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the structure of the utility model;

[0022] Figure 2 It is a cross-sectional view of the main body of the firing tunnel kiln of the utility model.

[0023] In the figure, 1. Drying kiln part; 2. Kiln car track; 3. Kiln door; 4. Track inside the kiln; 5. Dehumidification fan; 6. Heating main pipe; 7. Waste heat ventilation duct; 8. Firing tunnel kiln part; 9. Cooling kiln part; 10. Fan system; 11. Burner; 12. Refractory parts; 13. Kiln car; 14. Palletizing parts. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] like Figure 1-Figure 2 A tunnel kiln device for preparing lithium carbonate shown in the figure comprises a kiln and a kiln car 13 track 2, the kiln car 13 runs on the kiln car 13 track 2, the kiln and the kiln car 13 track 2 are prior art, a plurality of burners 11 are connected in the kiln, the burners 11 are used for heating, a conveying mechanism is provided in the kiln, and the conveying mechanism is used to transport the pressed lithium mica material into the kiln;

[0026] The kiln masonry of the kiln is built with high-grade heavy-duty and lightweight refractory insulation materials. The low-temperature section lining is made of heavy high-alumina bricks and lightweight clay bricks. The kiln outer wall masonry uses domestic high-quality cotton blankets and cotton felt for insulation according to different temperatures.

[0027] The kiln is connected with a heat supply pipe 6, and the heat supply pipe 6 of the drying kiln part 1 is located on the center line of the kiln top. The kiln is connected with a waste heat ventilation duct 7, which is used to recover heat energy and is used for partial heating of the kiln.

[0028] The waste heat ventilation duct 7 can recover the kiln exhaust smoke and cooling waste heat, and adopts the dispersed side air supply and upper side moisture removal method. The hot air temperature is 90-200℃, and the moisture removal temperature is 40-60℃. The waste heat from the kiln is first used for heating the tunnel kiln combustion air, and then used in the rear section of the dryer. Electric actuators are installed on the above branch pipes to intelligently distribute the waste heat.

[0029] A further improvement of the technical solution is that the conveying mechanism includes a kiln track 4, which is installed in the kiln furnace, and a kiln car 13 is provided on the kiln track 4, and the kiln car 13 slides on the kiln track 4, and a refractory part 12 is installed on the kiln car 13, and a plurality of stacking parts 14 are installed on the refractory part 12, and the stacking parts 14 are stacking machines.

[0030] The stacking pieces 14 are 6 stacks of 15 stacking pieces per kiln car, each stack has 10 layers, each layer has 27 pieces, and each car has a total of:

[0031] 6 stacks * 10 layers * 27 pieces = 1620 pieces.

[0032] A further improvement of the technical solution is that the refractory member 12 is a refractory brick.

[0033] A further improvement of the technical solution is that a dehumidification fan 5 is installed on the kiln, and a fan system 10 is installed on the kiln, and the fan system 10 is used to introduce air.

[0034] A further improvement of the technical solution is that the burner 11 is an energy-saving low-nitrogen burner 11, and the burner 11 is connected to an external energy supply device, such as natural gas.

[0035] The burners 11 are arranged at multiple points. The burners 11 in the front section of the preheating zone are automatically ignited to ensure the stability of the firing atmosphere and firing temperature in the kiln. In order to make the temperature control and adjustment of the firing zone flexible, the kiln uses energy-saving burners, which are arranged on the upper and lower sides of the kiln wall. A fire channel is reserved on the kiln car to prevent the flame from directly washing onto the product. There is a control group for every 2 sections, and a total of 372 burners 11 are arranged. The inner core of the low-nitrogen burner is made of heat-resistant stainless steel, with an SiC sleeve, SiC is silicon carbide, and a balanced regulating ball valve is provided.

[0036] The burner 11 is powered by natural gas. The combustion system consists of a natural gas pressure reducing station and a natural gas main line. After the gas passes through the filter in the pressure regulating station to remove impurities, it is sent to the gas main of the roller kiln after pressure regulation and stabilization, and then enters the burner 11 after being regulated by electric butterfly valves on several groups of branch pipes.

[0037] A further improvement of the technical solution is that the kiln includes a drying kiln part 1, a firing tunnel kiln part 8 and a cooling kiln part 9. When in use, the kiln car 13 enters the drying kiln part 1, the firing tunnel kiln part 8 and the cooling kiln part 9 in sequence, the drying kiln part 1, the firing tunnel kiln part 8 and the cooling kiln part 9 are connected in sequence, the dehumidification fan 5 is installed on the drying kiln part 1, the heating main pipe 6 provides heat for the drying kiln part 1, the heating main pipe 6 is the existing technology, the waste heat ventilation duct 7 is used to recover heat energy and is used for partial heating of the drying kiln part 1, the number of the fan system 10 is set to two, and they are respectively installed on the firing tunnel kiln part 8 and the cooling kiln part 9.

[0038] A further improvement of the technical solution is that a kiln door 3 is installed on the drying kiln part 1, and the kiln door 3 is used to prevent the exhaust gas from overflowing. The kiln door 3 is a manual double-opening kiln door 3, and the kiln door 3 is located at the dryer outlet of the drying kiln part 1.

[0039] A further improvement of the technical solution is that the interior of the kiln is made of refractory material.

[0040] A further improvement of the technical solution is that the drying kiln part 1 is sealed internally with a curved shape and bricks are used inside the drying kiln part 1 to ensure a tight seal.

[0041] A further improvement of the technical solution is that the fan system 10 includes a smoke exhaust fan, a combustion-supporting fan, a rapid cooling fan, a rapid cooling heat extraction fan, a slow cooling heat extraction fan, a tail cooling fan, an axle cooling fan, a tail air curtain fan and an undercarriage fan.

[0042] A further improvement of the technical solution is that the length ratios of the drying kiln part 1, the firing tunnel kiln part 8 and the cooling kiln part 9 are 10-20%, 40-45% and 40-45% respectively.

[0043] A further improvement of the technical solution is that the length ratios of the drying kiln part 1, the firing tunnel kiln part 8 and the cooling kiln part 9 are 10.91%, 46.32% and 42.73% respectively.

[0044] When in use, sulfate, calcium salt and lithium mica are mixed when pressing bricks. Sulfuric acid is not used. The lithium mica is processed by the acid salt method to prepare lithium carbonate, which is environmentally friendly. The kiln car 13 enters the drying kiln part 1, the firing tunnel kiln part 8 and the cooling kiln part 9 in sequence. The tunnel kiln is used for roasting, which can increase the processing capacity, improve production efficiency, and effectively improve the conversion rate of raw material roasting, thereby increasing the yield rate of the final product lithium carbonate. The burner 11 is used for heating, and the waste heat ventilation duct 7 is used to recover heat energy and is used for partial heating of the drying kiln part 1 to reduce energy consumption.

[0045] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tunnel kiln device for preparing lithium carbonate, comprising a kiln and a kiln car track (2), wherein the kiln car runs on the kiln car track (2), characterized in that: A plurality of burners (11) are connected to the kiln, and the burners (11) are used for heating. A conveying mechanism is provided in the kiln, and the conveying mechanism is used to transport the pressed lepidolite material into the kiln. The kiln is connected to a heat supply main pipe (6), and the kiln is connected to a waste heat ventilation duct (7), and the waste heat ventilation duct (7) is used to recover heat energy and to partially heat the kiln; The kiln is provided with a dehumidification fan (5), and the kiln is provided with a fan system (10), and the fan system (10) is used for introducing air; The kiln comprises a drying kiln part (1), a firing tunnel kiln part (8) and a cooling kiln part (9), wherein the drying kiln part (1), the firing tunnel kiln part (8) and the cooling kiln part (9) are connected in sequence, the dehumidification fan (5) is installed on the drying kiln part (1), the heat supply main pipe (6) provides heat for the drying kiln part (1), the waste heat ventilation duct (7) is used to recover heat energy and is used for partial heating of the drying kiln part (1), and the number of the fan system (10) is set to two, and they are respectively installed on the firing tunnel kiln part (8) and the cooling kiln part (9).

2. The tunnel kiln equipment for preparing lithium carbonate according to claim 1, characterized in that, The conveying mechanism comprises a kiln track (4), the kiln track (4) is installed in the kiln furnace, a kiln car (15) is provided on the kiln track (4), the kiln car (15) slides on the kiln track (4), a refractory part (16) is installed on the kiln car (15), and a plurality of stacking parts (14) are installed on the refractory part (16).

3. The tunnel kiln equipment for preparing lithium carbonate according to claim 1, characterized in that, The burner (11) is an energy-saving and low-nitrogen burner.

4. The tunnel kiln equipment for preparing lithium carbonate according to claim 3, characterized in that, The drying kiln part (1) is provided with a kiln door (3), and the kiln door (3) is used to prevent exhaust gas from overflowing.

5. The tunnel kiln equipment for preparing lithium carbonate according to claim 4, characterized in that, The drying kiln part (1) is curved and sealed internally, and brick masonry is used inside the drying kiln part (1).

6. The tunnel kiln equipment for preparing lithium carbonate according to claim 5, characterized in that, The fan system (10) comprises a smoke exhaust fan, a combustion-supporting fan, a rapid cooling fan, a rapid cooling heat extraction fan, a slow cooling heat extraction fan, a tail cooling fan, an axle cooling fan, a tail air curtain fan and an undercarriage fan.

7. The tunnel kiln equipment for preparing lithium carbonate according to claim 6, characterized in that, The length ratios of the drying kiln part (1), the firing tunnel kiln part (8) and the cooling kiln part (9) are 10-20%, 40-45% and 40-45% respectively.

8. The tunnel kiln equipment for preparing lithium carbonate according to claim 7, characterized in that, The length ratios of the drying kiln part (1), the firing tunnel kiln part (8) and the cooling kiln part (9) are 10.91%, 46.32% and 42.73% respectively.

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