Kiln device and impurity discharging method
By setting grooves and discharge ports at the bottom of the kiln pool to collect and periodically discharge heavy metal impurities, the problems of material inhomogeneity and waste in the preparation of basalt fiber are solved, and a more stable production process is achieved.
Patent Information
- Application Number
- CN202510944549.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-10-31
AI Technical Summary
In the existing basalt fiber preparation process, heavy metal impurities are released at high temperatures, resulting in uneven material output from the kiln, causing energy and raw material waste, and affecting production quality.
A groove and discharge port are set at the bottom of the kiln pool. The density difference of the metal impurities is used to cause them to settle and be collected. They are then discharged periodically through the discharge port. Combined with the cooling liquid system and the opening and closing method of the discharge switch, the stable discharge of impurities is ensured.
It improves the uniformity of materials output from the kiln, reduces raw material waste, enhances production reliability and safety, and lowers safety risks.
Smart Images
Figure CN120866975A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fiber material preparation technology, specifically to kiln equipment and impurity removal methods. Background Technology
[0002] Basalt fiber is a homogenized raw material made from natural basalt or a combination of natural basalt and other components. It requires high-temperature melting in a kiln at 1350–1620℃, followed by high-speed drawing through a platinum-rhodium alloy spinneret to produce continuous fibers. Continuous basalt fiber materials possess excellent thermal conductivity, sound absorption, non-flammability, corrosion resistance, low dielectric constant, and thermal stability, making them a competitive and sustainable new material industry within the high-tech fiber sector. They can be used as thermal and sound insulation materials, civil engineering materials, reinforcing fiber composites, filter materials, and high-strength, high-modulus composite materials.
[0003] The main raw material for preparing basalt fiber is basalt mineral, which contains a certain amount of heavy metal impurities, such as iron, copper, zinc, zirconium, titanium and their compounds. These compounds have the common characteristic of being heavy and do not easily form a homogeneous mixture with basalt materials.
[0004] Currently, in the preparation of basalt fiber, the melting process of basalt fiber materials is mainly carried out in a kiln. Generally, the bottom of the pool adopts electric melting technology, and the top part adopts full oxygen top firing or full oxygen side firing. However, during the continuous heating process, impurities in the raw materials will precipitate out of the material due to the high temperature. When there are a lot of impurities in the kiln, it will significantly affect the uniformity of the material output from the kiln, causing the subsequently formed fiber materials to become defective products that cannot meet the production standards, thus generating a lot of energy and raw material waste. Summary of the Invention
[0005] In view of this, the present invention provides a kiln device and a discharge method to solve the problem of poor reliability of existing fiber material melting preparation steps, which easily leads to raw material waste.
[0006] In a first aspect, the present invention provides a kiln apparatus, comprising: a main body, including a pool bottom and a pool wall, the pool wall surrounding and fixedly connected to the edge of the pool bottom, the pool bottom and the pool wall together forming a working space for accommodating fibrous materials, at least one upward-opening groove provided at the edge of the pool bottom, the groove communicating with the working space, a discharge port provided on the inner wall of the groove near the pool wall, the groove communicating with the outside through the discharge port, and a discharge structure provided on the pool wall, the discharge structure being set at a height higher than the discharge port; a heating unit disposed in the working space and used for heating the fibrous materials; and a discharge switch assembled and connected to the discharge port and used for controlling the on / off state of the discharge port.
[0007] Beneficial effects: Due to the high temperature in the working space, both the fiber material and metal impurities are in a liquid state. The molten metal, with its high density and low surface tension, sinks to the surface of the pool wall and then floats along it. A groove is provided at the bottom of the pool; as the metal impurities float, they fall into the groove and sink under gravity, unable to escape. Therefore, the groove effectively collects the metal impurities, preventing them from damaging the bottom and walls of the pool. Furthermore, a discharge port is provided at the groove. When a large amount of metal impurities is collected in the groove, it can be discharged through the discharge port. The metal impurities in the groove can be discharged from the working space along with the fiber material. Since the discharge port is connected to the inside of the groove, it can also effectively reduce the proportion of fiber material in the discharged material, avoiding waste of fiber material and greatly improving the uniformity of the output material from the kiln device. This effectively solves the problem of poor reliability and easy waste of raw materials in existing fiber material melting and preparation steps.
[0008] In one alternative implementation, there are multiple grooves and discharge ports, which are arranged at equal intervals along the edge of the bottom of the pool.
[0009] Beneficial effects: This arrangement of grooves and discharge ports has more of them, which not only allows for the storage of more molten metal and improves the reliability of impurity collection, but also makes the arrangement more uniform. Compared with only one set of grooves and discharge ports, it can avoid the unstable fluctuation of molten fiber material when discharging from a single discharge port, and also avoid the safety hazards caused by weight shift at the bottom of the pool.
[0010] In one alternative implementation, the lowest point of the discharge port is lower than the bottom surface of the groove, or the lowest point of the discharge port is aligned with the groove.
[0011] Beneficial effects: This type of discharge port can prevent molten metal from accumulating at the connection between the groove and the discharge port, allowing the molten metal to be discharged more smoothly from the discharge port and effectively reducing the amount of molten metal remaining in the groove during the discharge process.
[0012] In one optional embodiment, the main body further includes a discharge pipe, which is fixedly installed in the discharge port. The axes of the discharge pipe and the discharge port both extend in the horizontal direction. The end of the discharge pipe away from the working space extends out of the discharge port and forms a discharge end. A discharge switch is provided on the discharge pipe.
[0013] Beneficial effects: The discharge pipe has a simple and reliable structure, which can effectively extend the discharge distance at the discharge port and discharge molten metal more safely and reliably. In addition, the discharge pipe is also easier to install the discharge switch.
[0014] In one optional embodiment, the kiln apparatus further includes a cooling pool and a coolant supply system. The cooling pool is located below the discharge end and has a cooling trough inside for containing coolant. The coolant supply system is located above the cooling trough and has a supply port. The coolant supply system is adapted to deliver coolant to the cooling trough through its own supply port.
[0015] Beneficial effects: The molten metal will directly enter the cooling tank through the discharge pipe. The molten metal will be cooled by the coolant, which will prevent the scrap from overheating and the liquid flow from being too large, thus preventing local overheating that could affect production or cause other safety accidents, and improving the stability of the discharge process.
[0016] In one alternative embodiment, the groove is formed by enclosing a 33# AZS non-shrinkage cast electrofused brick; and / or, the discharge port is formed by enclosing a 95% ZrO2 electrofused brick.
[0017] Beneficial effects: This type of groove and discharge port is more reliable and durable.
[0018] Secondly, the present invention also provides a method for impurity discharge, using the above-mentioned kiln apparatus, comprising:
[0019] After the main body of the kiln device has run for a preset time, the discharge structure of the kiln device will be switched to the stop discharge state, and the addition of fiber material to the working space of the main body will be stopped.
[0020] Within the preset opening time, the discharge switch is opened at a constant speed until it is fully open;
[0021] After the preset feeding time is reached, the discharge switch will be switched to the off state.
[0022] Beneficial effects: This impurity discharge method can discharge heavy metals and their compounds deposited in the grooves of the main body, preventing heavy metals and their compounds from posing a safety threat to the main body. In addition, opening the discharge switch at a uniform speed can reduce the liquid surface fluctuation of the fibrous material inside the main body, and can discharge heavy metals and their compounds more stably.
[0023] In one optional implementation, before the step of uniformly opening the discharge switch to the fully open state within a preset opening time, the following method is further included:
[0024] Lower the temperature of the fiber material in the main body to 950-1190℃.
[0025] Beneficial effects: By reducing the temperature of the fiber material, the safety of the discharge process can be further improved, avoiding the situation where the discharged liquid temperature is too high and cannot be cooled down in time.
[0026] In one alternative implementation, the preset opening time ranges from 3 to 5 minutes.
[0027] Beneficial effects: By slowly opening the discharge switch over a longer period of time, the flow rate of the discharged liquid can be gradually increased, which can reduce the fluctuation of the liquid inside the main body and make the discharge process safer, reducing the risk of safety accidents.
[0028] In one optional embodiment, the groove of the main body is a rectangular groove and there are two of them. The length of the groove ranges from 9 to 11 cm, the width of the groove ranges from 9 to 11 cm, and the depth of the groove ranges from 3 to 6 cm; the preset duration ranges from 180 to 270 days.
[0029] Beneficial effects: With this type of groove, after the main body has been working normally for a preset time, the molten metal stored in the groove can be drained. This can prevent excessive molten metal from overflowing from the groove and also avoid frequent draining steps, thus preventing disruption to the normal production process. Attached Figure Description
[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0031] Figure 1 This is a cross-sectional view of a kiln apparatus according to an embodiment of the present invention.
[0032] Figure 2 for Figure 1 A top-view cross-section diagram of the kiln apparatus shown.
[0033] Explanation of reference numerals in the attached figures:
[0034] 1. Main body; 101. Bottom of the pool; 1011. Groove; 102. Pool wall; 1021. Discharge port; 1022. Discharge structure; 103. Working space; 104. Discharge pipe; 2. Discharge switch; 3. Cooling pool; 301. Cooling tank; 4. Coolant supply system; 5. Fiber material. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0036] In related technologies, during the preparation of basalt fibers, heavy metal impurities typically include iron, copper, zinc, zirconium, titanium, and their compounds. These compounds share the common characteristic of high density, making it difficult for them to form a homogeneous mixture with basalt materials. These high-density materials usually deposit at the bottom of the kiln, which not only affects the compositional consistency of the output molten fiber material, but also rapidly erodes and washes away the refractory materials on the kiln walls and bottom, causing rapid damage to the refractory materials, reducing the service life of the kiln, and potentially posing a safety threat.
[0037] The following is combined Figure 1 and Figure 2 The following describes embodiments of the present invention.
[0038] According to an embodiment of the present invention, a kiln device is provided, comprising: a main body 1, a heating part, and a discharge switch 2. The main body 1 includes a pool bottom 101 and a pool wall 102. The pool wall 102 is disposed around the edge of the pool bottom 101 and the two are fixedly connected. The pool bottom 101 and the pool wall 102 together form a working space 103 for accommodating fiber material 5. At least one groove 1011 with an upward opening is provided at the edge of the pool bottom 101. The groove 1011 communicates with the working space 103. A discharge port 1021 is provided on the inner wall of the groove 1011 near the pool wall 102. The groove 1011 communicates with the outside through the discharge port 1021. The pool wall 102 is provided with a discharge structure 1022. The height of the discharge structure 1022 is higher than the height of the discharge port 1021.
[0039] A heating element is provided in the working space 103 and is used to heat the fiber material 5;
[0040] The discharge switch 2 is assembled and connected to the discharge port 1021 and is used to control the on / off state of the discharge port 1021.
[0041] In the kiln apparatus of this embodiment, due to the high temperature in the working space 103, both the fibrous material and the metal impurities in the working space 103 are in a liquid state. Because the molten metal has a high density and low surface tension, it sinks to the surface of the pool wall 102 and then floats along its surface. A groove 1011 is provided at the bottom 101 of the pool. As the metal impurities float, they fall into the groove 1011 and sink to the bottom under gravity, thus preventing them from escaping. Therefore, the groove 1011 effectively collects the metal impurities, preventing them from damaging the bottom 101 and the pool wall 102. 2. In addition, a discharge port 1021 is set at the groove 1011. When there are a lot of metal impurities collected in the groove 1011, they can be discharged through the discharge port 1021. The metal impurities in the groove 1011 can be discharged from the working space 103 along with the fiber material. Since the discharge port 1021 is connected to the inside of the groove 1011, the proportion of fiber material in the discharged material can be effectively reduced, avoiding waste of fiber material and greatly improving the uniformity of the output material of the kiln device. This effectively solves the problem of poor reliability of the existing fiber material melting preparation steps and easy waste of raw materials.
[0042] Specifically, due to its high density and low surface tension, the molten metal sinks to the surface of the pool wall 102 and then floats along the surface of the pool wall 102. The discharge structure 1022 is positioned higher than the discharge port 1021. When discharging molten fiber material, although it can reduce the amount of molten metal at the bottom and affect the uniformity of the fiber material at the height of the discharge structure 1022, over a long period of time, the content of molten metal in the fiber material near the pool wall 102 will continue to increase, eventually affecting the uniformity of the fiber material discharged from the discharge structure 1022.
[0043] In this embodiment of the kiln device, the molten metal sinks to the surface of the pool wall 102 and then floats along the surface of the pool wall 102. The molten metal can be collected by setting a groove 1011 at the edge of the bottom 101 of the pool. The groove 1011 not only collects the molten metal, but also discharges it periodically. Even if there is a lot of molten metal in the groove 1011, it will not affect the uniformity of the fiber material at the height of the discharge structure 1022. In addition, it can prevent the molten metal from corroding and scouring the surface of the bottom 101 of the pool wall 102, improve the reliability, durability and safety of the main body 1, and reduce the risk of damage and leakage of the main body 1.
[0044] The density of the target material required in the fiber material is 2.5 kg / m³. 3 The density of impurities in the fiber material can reach 7.8 kg / m³. 3Therefore, impurities will sink to the surface of the pool wall 102.
[0045] In one possible implementation, there are multiple grooves 1011 and discharge ports 1021, which are arranged at equal intervals along the edge of the bottom of the pool 101. This arrangement of grooves 1011 and discharge ports 1021 results in a greater number of grooves 1011 and discharge ports 1021, which not only allows for the storage of more molten metal and improves the reliability of impurity collection, but also makes their arrangement more uniform. Compared to arranging only one set of grooves 1011 and discharge ports 1021, this arrangement avoids the unstable fluctuation of molten fiber material that can easily occur when discharging from a single discharge port 1021, and also avoids the safety hazards caused by the weight shift of the bottom of the pool 101.
[0046] Specifically, there is no limit to the number of grooves 1011 and discharge ports 1021. There can be two sets or more than three sets, as long as they can be evenly arranged.
[0047] In addition, the shape of the groove 1011 is not limited and can be circular, rectangular, fan-shaped, etc., which can be flexibly selected according to the needs.
[0048] In one possible implementation, the lowest point of the discharge port 1021 is lower than the bottom surface of the groove 1011, or the lowest point of the discharge port 1021 is aligned with the groove 1011. This type of discharge port 1021 can prevent the molten metal from accumulating at the connection between the groove 1011 and the discharge port 1021, and allows the molten metal to be discharged more smoothly from the discharge port 1021, effectively reducing the amount of molten metal remaining in the groove 1011 during the discharge step.
[0049] Specifically, the size of the discharge port 1021 is not limited and can be selected according to the size of the groove 1011.
[0050] Preferably, such as Figure 1 The highest point of the discharge port 1021 is at the same height as the opening of the groove 1011, or the highest point of the discharge port 1021 is lower than the opening of the groove 1011. This type of discharge port 1021 can reduce the amount of fiber material discharged when discharging outwards.
[0051] In one possible implementation, the main body 1 further includes a discharge pipe 104, which is fixedly installed in the discharge port 1021. The axes of the discharge pipe 104 and the discharge port 1021 both extend in the horizontal direction. One end of the discharge pipe 104 away from the working space 103 extends out of the discharge port 1021 and forms a discharge end. The discharge switch 2 is disposed on the discharge pipe 104. The discharge pipe 104 has a simple and reliable structure, which can effectively extend the discharge distance at the discharge port 1021 and discharge molten metal more safely and reliably. In addition, the discharge pipe 104 also makes it easier to install the discharge switch 2.
[0052] Specifically, the discharge pipe 104 is a stainless steel round pipe with a diameter ranging from 5 to 15 centimeters.
[0053] In one possible implementation, the kiln apparatus further includes a cooling pool 3 and a coolant supply system 4. The cooling pool 3 is located below the discharge end and has a cooling trough 301 for containing coolant inside. The coolant supply system 4 is located above the cooling trough 301 and has a supply port. The coolant supply system 4 is adapted to deliver coolant to the cooling trough 301 through its own supply port. The molten metal will directly enter the cooling trough 301 through the discharge pipe 104. The molten metal is cooled by the coolant to prevent overheating of the waste material and excessive liquid flow, which could cause local overheating and affect production or cause other safety accidents, thereby improving the stability of the discharge process.
[0054] Specifically, there is no limitation on the specific type of coolant; it can be cooling oil, cooling water, or other coolants, as long as it can quickly cool the liquid output from the discharge end.
[0055] Preferably, the coolant is cooling water.
[0056] In one possible implementation, the groove 1011 is formed by enclosing a 33#AZS non-shrinkage cast electrofused brick; the discharge port 1021 is formed by enclosing a 95%ZrO2 electrofused brick.
[0057] This type of groove 1011 and discharge port 1021 is more reliable and durable.
[0058] Specifically, the 33#AZS electrofused brick is a shrinkage-free cast AZS electrofused brick, and the structural material at the discharge port 1021 is an electrofused refractory material product of 95% ZrO2.
[0059] It is understood that, as an alternative implementation, the groove 1011 can also be formed by enclosing one of 36#AZS non-shrinkage cast electrofused bricks and 41#AZS non-shrinkage cast electrofused bricks, and the discharge port 1021 can also be formed by enclosing one of 80%ZrO2 electrofused bricks and 41#AZS non-shrinkage cast electrofused bricks.
[0060] According to an embodiment of the present invention, in another aspect, an impurity discharge method is provided, employing the above-described kiln apparatus, comprising:
[0061] After the running time of the main body 1 of the kiln device reaches the preset time, the discharge structure 1022 of the kiln device is switched to the stop discharge state, and the addition of fiber material 5 to the working space 103 of the main body 1 is stopped.
[0062] Within the preset opening time, the discharge switch 2 is opened at a constant speed until it is fully open;
[0063] After the material feeding time reaches the preset feeding time, switch the material discharge switch 2 to the off state.
[0064] This impurity discharge method can discharge heavy metals and their compounds deposited in the groove 1011 of the main body 1, preventing heavy metals and their compounds from posing a safety threat to the main body 1. In addition, opening the discharge switch 2 at a uniform speed can reduce the liquid surface fluctuation of the fibrous material 5 inside the main body 1, and can discharge heavy metals and their compounds more stably.
[0065] Specifically, since there are multiple grooves 1011 and discharge ports 1021, multiple discharge switches 2 need to be opened simultaneously when the discharge switch 2 is opened, so that heavy metals and their compounds in each groove 1011 are discharged at the same time, avoiding excessive shift of the center of gravity of the main body 1.
[0066] It should be noted that the impurity removal method in this embodiment is not only applicable to basalt fiber materials, but can also be applied to the preparation processes of other fiber materials such as alkali-free glass fiber, high-strength glass fiber, high-modulus glass fiber, high-temperature resistant glass fiber, alkali-resistant glass fiber, acid-resistant glass fiber, low dielectric constant glass fiber, and conductive fiber.
[0067] In one possible implementation, before the step of uniformly opening the discharge switch 2 to the fully open state within a preset opening time, the method further includes:
[0068] Lowering the temperature of the fiber material 5 in the main body 1 to 950-1190℃ can further improve the safety of the discharge process and prevent the discharged liquid from being too hot and unable to be cooled down in time.
[0069] Specifically, before the temperature of the fiber material 5 in the main body 1 decreases, the internal temperature range is 1350-1620℃. At this time, the liquid temperature in the main body 1 is too high, and it is difficult to cool down quickly after being discharged through the discharge port 1021, which may easily lead to safety accidents.
[0070] In addition to detecting the temperature of the fiber material 5 in the main body 1, the color of the refractory bricks on the inner wall of the main body 1 can also be observed. When the temperature of the refractory bricks is above 1300°C, the bricks will be red. When the temperature is between 1050°C and 1300°C, the color will be dark red. When the temperature of the refractory bricks is below 1000°C, the color will be brownish-black. Preferably, when the color of the refractory bricks is observed to be brownish-black, it can be determined that the temperature of the fiber material 5 in the main body 1 has dropped to the target temperature.
[0071] In one possible implementation, the preset opening time is in the range of 3 to 5 minutes. By slowly opening the discharge switch 2 over a longer period of time, the flow rate of the discharged liquid can be gradually increased, which can reduce the fluctuation of the liquid inside the main body 1 and make the discharge process safer, reducing the risk of safety accidents.
[0072] In one possible implementation, the grooves 1011 of the main body 1 are rectangular grooves, and there are two of them. The length of the grooves 1011 ranges from 9 to 11 cm, the width of the grooves 1011 ranges from 9 to 11 cm, and the depth of the grooves 1011 ranges from 3 to 6 cm; the preset duration ranges from 180 to 270 days. Using this type of groove 1011, after the main body 1 has been operating normally for the preset duration, the molten metal stored in the grooves 1011 can be drained. This avoids excessive overflow of molten metal from the grooves 1011 and also avoids frequent draining steps, thus preventing disruption to the normal production process.
[0073] Specifically, the length of the groove 1011 can be 9 cm, 10 cm, or 11 cm, the width can be 9 cm, 10 cm, or 11 cm, the depth of the groove can be 3 cm, 4 cm, 5 cm, or 6 cm, and the preset duration can be 180 days, 210 days, 240 days, or 270 days, which can be flexibly selected according to needs.
[0074] It is understood that, as an alternative implementation method, the number, size, and preset duration of the grooves 1011 can be varied and selected according to the specific size of the main body 1.
[0075] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A kiln apparatus, characterized in that, include: The main body (1) includes a pool bottom (101) and a pool wall (102). The pool wall (102) is arranged around the edge of the pool bottom (101) and the two are fixedly connected. The pool bottom (101) and the pool wall (102) together form a working space (103) for accommodating fiber material (5). At least one groove (1011) with an upward opening is provided at the edge of the pool bottom (101). The groove (1011) is connected to the working space (103). A discharge port (1021) is provided on the inner wall of the groove (1011) near the pool wall (102). The groove (1011) is connected to the outside through the discharge port (1021). The pool wall (102) is provided with a discharge structure (1022). The height of the discharge structure (1022) is higher than the height of the discharge port (1021). A heating element is disposed in the working space (103) and is used to heat the fiber material (5); The discharge switch (2) is assembled and connected to the discharge port (1021) and is used to control the on / off state of the discharge port (1021).
2. The kiln apparatus according to claim 1, characterized in that, The number of grooves (1011) and discharge ports (1021) are both multiple, and they are arranged at equal intervals along the edge of the bottom of the pool (101).
3. The kiln apparatus according to claim 1, characterized in that, The lowest point of the discharge port (1021) is lower than the bottom surface of the groove (1011), or the lowest point of the discharge port (1021) is aligned with the groove (1011).
4. The kiln apparatus according to any one of claims 1 to 3, characterized in that, The main body (1) also includes a discharge pipe (104), which is fixedly installed in the discharge port (1021). The axes of the discharge pipe (104) and the discharge port (1021) extend in the horizontal direction. One end of the discharge pipe (104) away from the working space (103) extends out from the discharge port (1021) and forms a discharge end. The discharge switch (2) is provided on the discharge pipe (104).
5. The kiln apparatus according to claim 4, characterized in that, The kiln device further includes a cooling pool (3) and a coolant supply system (4). The cooling pool (3) is located below the discharge end. The cooling pool (3) has a cooling tank (301) for containing coolant inside. The coolant supply system (4) is located above the cooling tank (301). The coolant supply system (4) has a supply port. The coolant supply system (4) is adapted to deliver the coolant to the cooling tank (301) through its own supply port.
6. The kiln apparatus according to claim 4, characterized in that, The groove (1011) is formed by enclosing it with 33#AZS non-shrinkage cast electrofused brick; And / or, the discharge port (1021) is formed by enclosing it with 95% ZrO2 electrofused bricks.
7. A method for removing impurities, using the kiln apparatus according to any one of claims 1 to 6, characterized in that, include: After the running time of the main body (1) of the kiln device reaches the preset time, the discharge structure (1022) of the kiln device is switched to the stop discharge state, and the addition of fiber material (5) to the working space (103) of the main body (1) is stopped. Within a preset opening time, the discharge switch (2) is opened at a constant speed until it is fully open; After the feeding time reaches the preset feeding time, the feeding switch (2) is switched to the closed state.
8. The impurity emission method according to claim 7, characterized in that, Before the step of uniformly opening the discharge switch (2) to the fully open state within the preset opening time, the following steps are also included: Lower the temperature of the fiber material (5) in the main body (1) to 950-1190°C.
9. The impurity emission method according to claim 7, characterized in that, The preset opening time ranges from 3 to 5 minutes.
10. The impurity emission method according to claim 7, characterized in that, The groove (1011) of the main body (1) is a rectangular groove and there are two of them. The length of the groove (1011) ranges from 9 to 11 cm, the width of the groove (1011) ranges from 9 to 11 cm, and the depth of the groove (1011) ranges from 3 to 6 cm. The preset duration ranges from 180 to 270 days.