A method for replacing a front bed to receive molten crude tin

Abstract

This invention discloses a device for receiving molten crude tin, replacing a foreboard, comprising: a converter; a feed inlet at the top of the converter, a discharge outlet on the side wall of the converter, a carbon brick lining, a steam jacket covering the outer wall of the converter, and a burner at one end of the converter; the steam jacket has a steam inlet and a steam outlet, with the steam inlet positioned higher than the steam outlet; the discharge outlet is a circular hole, extending outwards into a U-shaped short chute on the side wall of the converter, the diameter of the semicircular arc of the U-shaped short chute being the same as the diameter of the discharge outlet hole, and a retaining groove on the side of the U-shaped short chute closest to the side wall of the converter, on which a slag-blocking plate can be detachably installed. This invention's device can replace a foreboard for receiving molten crude tin in a safe, efficient, and environmentally friendly manner.

Description

Technical Field

[0001] The invention belongs to the technical field of tin smelting, and relates to a device and a method for replacing a front bed to receive molten crude tin. Background Art

[0002] In the traditional crude tin smelting process, the molten crude tin produced by the smelting furnace is generally placed directly into the front bed in front of the smelting furnace through a chute. After natural cooling or water spraying, the ethyl tin condensed on the surface of the melt is removed, and then the crude tin after the ethyl tin is removed, that is, the methyl tin, is transferred to the refining pot through a chute or a tin pump for impurity removal.

[0003] The front bed used in tin smelting is generally built with aluminum-chromium refractory bricks or carbon bricks. It is a fixed facility and has no heating function. The molten crude tin placed in it is cooled naturally, which takes a long time to cool down, seriously affecting the operating efficiency; if water is used for forced cooling, there are problems such as explosion hazards, poor working environment and no heat recovery. Moreover, the process of removing ethyl tin from the front bed is time-consuming even with mechanical assistance. The operators must manually remove the residual ethyl tin that cannot be removed by the machine. The high temperature and smoke lead to a poor working environment and high labor intensity. In addition, after the front bed has been used for a period of time, high-melting-point hard heads (i.e., iron-tin alloy) will accumulate at the bottom of the front bed, causing the volume of the front bed to become smaller and unable to be used normally. At this time, the hard heads condensed at the bottom of the front bed can only be crushed and removed by mechanical crushing. This process has the risk of damaging the bottom bricks of the front bed, resulting in tin leakage in subsequent use. At the same time, removing the hard heads is a high-intensity work.

[0004] In addition, the ethyl tin removed from the front bed surface after cooling and the hard head removed from the bottom of the front bed generally need to be smelted and condensed to recover the tin and separate most of the iron and arsenic impurities. Smelting generally uses a centrifuge or a smelting furnace. Since the ethyl tin and hard head materials are large agglomerates, it is difficult to add materials for both impurity removal methods, with high labor intensity and poor working environment. At the same time, the centrifuge method and the smelting furnace method also have the above problems in the slag removal process to varying degrees.

[0005] Based on the above situation, the front bed receives the crude tin produced by the tin smelting furnace, separates tin A and tin B, and completes the initial impurity removal process. Not only is the operation efficiency low, the working environment is poor, and the labor intensity is high, but the cleaning process of the front bed is also very likely to cause damage to the front bed, resulting in a high frequency of maintenance of the front bed. In addition, it is also difficult to handle the tin B and hard heads produced by the front bed in the treatment of molten crude tin separately, and there are also problems of high labor intensity and poor working environment.

[0006] Therefore, developing a device and method that can replace the front bed to receive molten crude tin for safe, efficient and environmentally friendly operations is a technical problem that people in this field urgently need to solve. Summary of the invention

[0007] In view of this, the present invention provides a device and method for receiving molten crude tin instead of a front bed.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A device for receiving molten crude tin instead of a front bed, comprising: a converter; a feed port is arranged on the top of the converter, a discharge port is arranged on the side wall of the converter, the inner lining of the converter is carbon brick, the outer wall of the converter is wrapped with a steam water jacket, and a burner is arranged at one end of the converter;

[0010] The steam water jacket is provided with a steam inlet and a steam outlet, and the steam inlet is located higher than the steam outlet;

[0011] The above-mentioned discharge port is a circular hole, and a U-shaped short chute extends outward from the discharge port on the side wall of the converter. The diameter of the semicircular arc section of the U-shaped short chute is consistent with the aperture of the discharge port. A slot is provided on the side of the U-shaped short chute close to the side wall of the converter, and a slag retaining plate is detachably installed on the slot.

[0012] The beneficial effects of the present invention are as follows: the lining of the converter for receiving the molten crude tin instead of the front bed is carbon brick, the outer wall is wrapped with a steam water jacket, and has a rapid forced cooling function, which can cool the high-temperature molten crude tin to the target temperature in a relatively short time, and can save more than half of the time compared with cooling using the front bed, and has higher operating efficiency; the cooling process uses low-pressure steam to pass through the steam water jacket to take away the heat, and has flexible ventilation and gas stop, and the risk of explosion of the water jacket can be avoided when the converter has leakage, and has higher safety and convenience.

[0013] The converter has a burner with heating function, which can receive molten crude tin multiple times. After separating tin A, tin B and hard heads can be accumulated to a certain amount and then melted out uniformly. The melting process further separates tin A, eliminating the subsequent separate treatment of tin B and hard heads, thereby improving production efficiency. After the melting is completed, the temperature continues to rise, and the residual tin slag in the furnace can be easily cleaned out, which basically avoids the need for manual cleaning when using the front bed, further reducing labor intensity and improving work efficiency.

[0014] The feed port is arranged at the top of the converter to receive the high-temperature molten crude tin produced by the smelting furnace, and solid crude tin ingots produced by other smelting furnaces can also be put in from here to expand the raw material processing range of the converter. At the same time, the feed port arranged at the top can also be used as the flue gas outlet of the converter during the use of the burner.

[0015] After the molten crude tin placed in the converter completes the cooling process, during the pouring of the tin A, the discharge port with the slag baffle can effectively prevent the condensed tin slag (i.e. tin B) from entering the tin A special transfer bag.

[0016] Furthermore, the above-mentioned discharge port is a circular hole with an aperture of 80-120 mm, and the discharge port extends outwardly on the side wall of the converter to form a U-shaped short chute with a length of 200-400 mm.

[0017] Furthermore, the above-mentioned discharge port is arranged on the side wall of the converter at a distance of 3 / 5-7 / 10 from the bottom of the converter.

[0018] The beneficial effect of adopting the above-mentioned further technical scheme is that: the discharge port is set at a higher position, so the pressure of the melt placed in the converter on the discharge port is small, which facilitates the opening and blocking operations of the discharge port; in addition, when the amount of melt placed in the converter is small, the discharge port at a higher position can be in a normally open state, and there is no need to perform a blocking operation every time.

[0019] Furthermore, the included angle between the central axis of the burner and the horizontal central axis of the converter is 10-15 degrees, and the bottom end of the burner is at least 200 mm away from the horizontal central axis of the discharge port.

[0020] The beneficial effects of adopting the above further technical solution are: during the heating process, the burner can directly act on the melt in the converter, with high heating efficiency; the vertical position of the burner is above the horizontal plane of the discharge port, which leaves sufficient combustion space for the burner while also avoiding erosion of the burner by the metal melt.

[0021] Furthermore, the outer wall of the converter whose vertical height is 100-200 mm below the discharge port is wrapped with a steam water jacket.

[0022] The beneficial effect of adopting the above further technical solution is that the steam water jacket mainly cools the furnace wall portion that is in direct contact with the melt, thereby achieving the purpose of forced cooling and simplifying the furnace structure.

[0023] Furthermore, it also includes: an air collecting hood, which is arranged above the converter, and the feed port is arranged below the air collecting hood, and the air collecting hood is connected to an external dust removal pipeline through an exhaust pipe.

[0024] The beneficial effects of adopting the above-mentioned further technical scheme are: the cooling process of the molten crude tin is in a relatively sealed environment, and a flue gas collection hood is provided above the converter, so the cooling process is clean and environmentally friendly, which greatly improves the operating environment of employees; most of the flue gas during the operation of the converter is collected by the fume collection hood, and then treated by the corresponding dust removal facilities after passing through the exhaust pipe. The on-site working environment is much cleaner and more environmentally friendly than when using the front bed, when the melt is in a completely open mode and it is difficult to collect the flue gas in a centralized manner.

[0025] The present invention also provides a method for replacing a front bed to receive molten crude tin, comprising the following steps:

[0026] (1) The tail of the chute of the smelting furnace is connected to the feed port of the converter, and the horizontal plane of the feed port is lower than the horizontal plane of the tin discharge port of the smelting furnace, so that the chute has an inclination of 3 to 5 degrees, and the high-temperature molten crude tin produced by the smelting furnace flows into the chute through the tin discharge port of the smelting furnace, and then enters the converter lined with carbon bricks through the chute and the feed port;

[0027] (2) When the high-temperature molten crude tin begins to enter the converter, steam is continuously introduced into the steam jacket through the steam inlet and then ejected from the steam outlet to complete the cooling process, and the introduction of steam is stopped;

[0028] (3) installing a slag blocking plate, inserting the slag blocking plate to block the upper half of the discharge port, rotating the converter, pouring the tin A through the discharge port into a tin transfer bag dedicated to tin A, leaving the remaining solid tin B and hard heads in the converter, igniting the burner, melting the solid tin B and hard heads, raising the temperature, keeping the temperature, extinguishing the burner, and then pouring the tin A obtained by melting out through the discharge port into a tin transfer bag dedicated to tin A;

[0029] (4) Return the converter to the normal position, ignite the burner, heat up the remaining tin slag in the furnace, keep it warm, extinguish the burner, remove the slag baffle, and pour the tin slag out through the discharge port into a special tin slag transfer bag;

[0030] (5) During the operation steps (1) to (4), the flue gas generated by the converter is extracted through the gas collecting hood and the exhaust duct.

[0031] The beneficial effects of the present invention are as follows: at the same time when the high-temperature molten crude tin begins to enter the converter, the present invention continuously passes steam into the steam water jacket through the steam inlet, and then sprays it out from the steam outlet to complete cooling, which has the advantage of rapid forced cooling, can cool the high-temperature molten crude tin to the target temperature in a relatively short time, and has high operating efficiency; the cooling process of the molten crude tin is in a relatively sealed environment, and during operation, the smoke generated by the converter is sucked away by the gas collecting hood and the exhaust pipe, the cooling process is clean and environmentally friendly, and the operating environment of the employees is greatly improved; the cooling process uses low-pressure steam to pass through the steam water jacket to take away heat, and has flexible ventilation and gas stop, and the risk of explosion of the water jacket can be avoided when the converter has leakage, and the safety and convenience are high.

[0032] The converter has a heating function and can receive molten crude tin multiple times. After separating tin A, tin B and hard heads can be accumulated to a certain amount and then melted out uniformly. The melting process further separates tin A, eliminating the subsequent separate treatment of tin B and hard heads, thereby improving production efficiency. After the melting is completed, the temperature continues to rise, and the residual tin slag in the furnace can be easily cleaned out, basically avoiding the need for manual cleaning when using the front bed, further reducing labor intensity and improving work efficiency.

[0033] The converter separates tin A from tin B and hard heads by dumping, which has high operating efficiency, reduces the degree of direct contact of operators, and greatly reduces labor intensity and safety risks of high-temperature operations.

[0034] Furthermore, the temperature of the high temperature molten crude tin in step (1) is 1150-1250°C.

[0035] Furthermore, in step (2), the temperature is lowered to below 500° C. for a period of 20-40 minutes.

[0036] The beneficial effect of adopting the above further technical solution is that when the crude tin temperature drops below 500°C, most of the iron and arsenic impurities condense into the solidified ethyl tin, thereby achieving the purpose of removing impurities, and the methyl tin liquid at around 500°C still has good fluidity and is easy to transport.

[0037] Furthermore, the steam pressure introduced in step (2) is ≤1 MPa.

[0038] The beneficial effects of adopting the above-mentioned further technical scheme are: steam with lower pressure is easier to obtain, and the steam pressure produced by the waste heat power station in the smelter after power generation is often ≤1MPa, so it can be directly used for cooling the steam water tank of the converter of the present invention, which is more convenient; the lower pressure steam corresponds to a lower temperature, and the greater the temperature difference with the melt in the converter, the more conducive to rapid cooling; in addition, the lower pressure steam is also relatively safe during use.

[0039] Furthermore, in step (3), the temperature is raised to 500-700° C. and the heat preservation time is 30-90 minutes.

[0040] The beneficial effect of adopting the above further technical solution is that the ethyl tin remaining in the converter is in a semi-molten state after being kept warm for a period of time within the above temperature range, and has a certain fluidity. After the converter is rotated and poured through the discharge port equipped with a slag baffle, a certain amount of methyl tin can be effectively separated.

[0041] Furthermore, in step (4), the temperature is raised to 850-950° C. and the heat preservation time is 20-60 min.

[0042] The beneficial effect of adopting the above-mentioned further technical scheme is that the tin slag and hard heads remaining in the converter can have a certain fluidity after being kept warm in the above-mentioned higher temperature range for a period of time. After removing the slag baffle at the discharge port, the fluid residue carries with it the solid slag and flows out from the discharge port, thereby finally achieving the purpose of removing the residual slag in the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 The schematic diagram of the main structure and use of the device for replacing the front bed to receive the molten crude tin;

[0045] Figure 2 It is a schematic diagram of the left side cross-sectional view of the structure of the device for receiving molten crude tin instead of the front bed;

[0046] Figure 3 It is a schematic diagram of the structure of a U-shaped short chute in a device for receiving molten crude tin instead of a front bed.

[0047] Among them, 1-smelting furnace, 2-tin outlet, 3-chute, 4-feeding port, 5-converter, 6-carbon brick, 7-steam water jacket, 8-steam outlet, 9-steam inlet, 10-burner, 11-discharging port, 12-gas collecting hood, 13-exhaust pipe, 14-U-shaped short chute, 15-card slot, 16-slag baffle. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1-3 As shown, the device for receiving molten crude tin instead of the front bed comprises: a converter 5; a feed port 4 is arranged at the top of the converter 5, a discharge port 11 is arranged at the side wall of the converter 5, the inner lining of the converter 5 is carbon brick 6, the outer wall of the converter 5 is wrapped with a steam water jacket 7, and a burner 10 is arranged at one end of the converter 5;

[0050] The steam water jacket 7 is provided with a steam inlet 9 and a steam outlet 8 , and the steam inlet 9 is located higher than the steam outlet 8 .

[0051] The discharge port 11 is a circular hole, and a U-shaped short chute 14 is extended outwardly from the side wall of the converter 5. The diameter of the semicircular arc section of the U-shaped short chute 14 is consistent with the aperture of the discharge port 11. A slot 15 is provided on the side of the U-shaped short chute 14 close to the side wall of the converter 5, and a slag retaining plate 16 is detachably installed on the slot 15.

[0052] In one embodiment, the discharge port 11 is a circular hole with a diameter of 80-120 mm, and the discharge port 11 extends outwardly from the side wall of the converter 5 to form a U-shaped short chute 14 with a length of 200-400 mm.

[0053] In one embodiment, the discharge port 11 is disposed on the side wall of the converter 5 at a distance of 3 / 5-7 / 10 from the bottom of the converter 5 .

[0054] In one embodiment, the central axis of the burner 10 and the horizontal central axis of the converter 5 form an angle of 10-15 degrees, and the bottom end of the burner 10 is at least 200 mm away from the horizontal central axis of the discharge port 11.

[0055] In one embodiment, the outer wall of the converter 5 whose vertical height is lower than the discharge port 11100-200 mm is wrapped with a steam water jacket 7.

[0056] In one embodiment, it also includes: an air collecting hood 12, which is arranged above the converter 5, and the feed port 4 is arranged below the air collecting hood 12, and the air collecting hood 12 is connected to the external dust removal pipeline through the exhaust pipe 13.

[0057] The present invention also provides a method for replacing a front bed to receive molten crude tin, comprising the following steps:

[0058] (1) The tail of the chute 3 of the smelting furnace 1 is connected to the feed port 4 of the converter 5. The horizontal plane of the feed port 4 is lower than the horizontal plane of the tin discharge port 2 of the smelting furnace 1, so that the chute 3 has an inclination angle of 3 to 5 degrees. The high-temperature molten crude tin produced by the smelting furnace 1 flows into the chute 3 through the tin discharge port 2 of the smelting furnace 1, and then enters the converter 5 lined with carbon bricks 6 through the chute 3 and the feed port 4;

[0059] (2) When the high-temperature molten crude tin begins to enter the converter 5, steam is continuously introduced into the steam jacket 7 through the steam inlet 9 and then ejected from the steam outlet 8 to complete the temperature reduction, and the introduction of steam is stopped;

[0060] (3) Install the slag blocking plate 16, insert the slag blocking plate 16 to block the upper half of the discharge port 11, rotate the converter 5, pour the tin A through the discharge port 11 and pour it into the tin transfer bag for tin A, and leave the remaining solid tin B and hard heads in the converter 5, ignite the burner 10, melt the solid tin B and hard heads, increase the temperature, keep the temperature, extinguish the burner 10, and then pour the tin A obtained by melting out through the discharge port 11 and pour it into the tin transfer bag for tin A;

[0061] (4) Return the converter 5 to the normal position, ignite the burner 10, heat the remaining tin slag in the converter, keep the temperature, extinguish the burner 10, remove the slag baffle 16, and pour the tin slag out through the discharge port 11 and pour it into a special tin transfer bag for tin slag;

[0062] (5) During the operation steps (1) to (4), the smoke generated by the converter 5 is extracted through the gas collecting hood 12 and the exhaust pipe 13.

[0063] Example 1

[0064] The method for replacing the front bed to receive molten crude tin comprises the following steps:

[0065] (1) The tail of the chute 3 of the smelting furnace 1 is connected to the feed port 4 of the converter 5. The horizontal plane of the feed port 4 is lower than the horizontal plane of the tin outlet 2 of the smelting furnace 1, so that the chute 3 has a 3-degree inclination angle. The high-temperature molten crude tin with a temperature of 1150° C. produced by the smelting furnace 1 flows into the chute 3 through the tin outlet 2 of the smelting furnace 1, and then enters the 80-ton converter 5 lined with carbon bricks 6 through the chute 3 and the feed port 4;

[0066] (2) When the high-temperature molten crude tin begins to enter the converter 5, steam is continuously introduced into the steam jacket 7 through the steam inlet 9, the steam pressure is ≤1MPa, the steam flow rate is 2.5t / h, and then it is ejected from the steam outlet 8, and the temperature is reduced to below 500°C in 30 minutes. After the temperature reduction is completed, the steam introduction is stopped;

[0067] (3) Install the slag blocking plate 16. After the slag blocking plate 16 is inserted, it blocks the upper half of the discharge port 11. Rotate the converter 5, pour out the tin A through the discharge port 11 and pour it into the tin transfer bag for tin A. The remaining solid tin B and hard heads remain in the converter 5. The first tin discharge is completed. Then, the converter 5 is returned to the normal position and waits for the next tin discharge. That is, the high-temperature molten crude tin enters the converter 5. The temperature is lowered and the previous operation is repeated until the third tin discharge is completed. The burner 10 of the converter 5 is ignited to melt the solid tin B and hard heads. The temperature is raised to 650° C. and the heat preservation time is 35 minutes. The burner 10 is extinguished. The tin A obtained by melting is poured out through the discharge port 11 and poured into the tin transfer bag for tin A.

[0068] (4) Return the converter 5, ignite the burner 10 of the converter 5, heat the remaining tin slag in the furnace to 850° C., keep the temperature for 25 min, extinguish the burner 10, remove the slag baffle 16, and pour the tin slag out through the discharge port 11 and pour it into a special tin transfer bag for tin slag;

[0069] (5) During the operation steps (1) to (4), the smoke generated by the converter 5 is extracted through the gas collecting hood 12 and the exhaust pipe 13.

[0070] Example 2

[0071] The method for replacing the front bed to receive molten crude tin comprises the following steps:

[0072] (1) The tail of the chute 3 of the smelting furnace 1 is connected to the feed port 4 of the converter 5. The horizontal plane of the feed port 4 is lower than the horizontal plane of the tin outlet 2 of the smelting furnace 1, so that the chute 3 has an inclination of 5 degrees. The high-temperature molten crude tin with a temperature of 1250° C. produced by the smelting furnace 1 flows into the chute 3 through the tin outlet 2 of the smelting furnace 1, and then enters the 100-ton converter 5 lined with carbon bricks 6 through the chute 3 and the feed port 4;

[0073] (2) When the high-temperature molten crude tin begins to enter the converter 5, steam is continuously introduced into the steam jacket 7 through the steam inlet 9, the steam pressure is ≤1MPa, the steam flow rate is 3.5t / h, and then it is ejected from the steam outlet 8, and the temperature is reduced to below 500°C in 30 minutes. After the temperature reduction is completed, the steam introduction is stopped;

[0074] (3) Install the slag blocking plate 16. After the slag blocking plate 16 is inserted, it blocks the upper half of the discharge port 11. Rotate the converter 5, pour out the tin A through the discharge port 11 and pour it into the tin transfer bag for tin A. The remaining solid tin B and hard heads remain in the converter 5. The first tin discharge is completed. Then, the converter 5 is returned to the normal position and waits for the next tin discharge. That is, the high-temperature molten crude tin enters the converter 5. The temperature is lowered and the previous operation is repeated until the fourth tin discharge is completed. The burner 10 of the converter 5 is ignited to melt the solid tin B and hard heads. The temperature is raised to 700° C. and the heat preservation time is 60 minutes. The burner 10 is extinguished. The tin A obtained by melting is poured out through the discharge port 11 and poured into the tin transfer bag for tin A.

[0075] (4) Return the converter 5, ignite the burner 10 of the converter 5, raise the temperature of the remaining tin slag in the furnace to 950° C., keep the temperature for 40 min, extinguish the burner 10, remove the slag baffle 16, and pour the tin slag out through the discharge port 11 and pour it into a special tin transfer bag for tin slag;

[0076] (5) During the operation steps (1) to (4), the smoke generated by the converter 5 is extracted through the gas collecting hood 12 and the exhaust pipe 13.

[0077] The disclosed embodiments are described to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for replacing a front bed to receive molten crude tin, characterized in that: The following steps are involved: (1) The tail of the chute of the smelting furnace is connected to the feed port of the converter, and the horizontal plane of the feed port is lower than the horizontal plane of the tin discharge port of the smelting furnace, so that the chute has an inclination of 3 to 5 degrees, and the high-temperature molten crude tin produced by the smelting furnace flows into the chute through the tin discharge port of the smelting furnace, and then enters the converter lined with carbon bricks through the chute and the feed port; (2) When the high-temperature molten crude tin begins to enter the converter, steam is continuously introduced into the steam jacket through the steam inlet and then ejected from the steam outlet to complete the cooling process, and the introduction of steam is stopped; (3) installing a slag blocking plate, inserting the slag blocking plate to block the upper half of the discharge port, rotating the converter, pouring the tin A through the discharge port into a tin transfer bag dedicated to tin A, leaving the remaining solid tin B and hard heads in the converter, igniting the burner, melting the solid tin B and hard heads, raising the temperature, keeping the temperature, extinguishing the burner, and then pouring the tin A obtained by melting out through the discharge port into a tin transfer bag dedicated to tin A; (4) Return the converter to the normal position, ignite the burner, heat up the remaining tin slag in the furnace, keep it warm, extinguish the burner, remove the slag baffle, and pour the tin slag out through the discharge port into a special tin slag transfer bag; (5) During the operation steps (1) to (4), the flue gas generated by the converter is extracted through the gas collecting hood and the exhaust pipe; The device for receiving molten crude tin instead of the front bed comprises: a converter; a feed port is arranged on the top of the converter, a discharge port is arranged on the side wall of the converter, the inner lining of the converter is carbon brick, the outer wall of the converter is wrapped with a steam water jacket, and a burner is arranged at one end of the converter; The steam water jacket is provided with a steam inlet and a steam outlet, and the steam inlet is located higher than the steam outlet; The discharge port is a circular hole, and a U-shaped short chute is extended outward from the discharge port on the side wall of the converter. The diameter of the semicircular arc section of the U-shaped short chute is consistent with the aperture of the discharge port. A slot is provided on one side of the U-shaped short chute close to the side wall of the converter, and a slag blocking plate is detachably installed on the slot; It also includes: an air collecting hood, which is arranged above the converter, and the feed port is arranged below the air collecting hood, and the air collecting hood is connected with an external dust removal pipeline through an exhaust pipe.

2. A method for replacing the front bed to receive molten crude tin according to claim 1, characterized in that: The discharge port is arranged on the side wall of the converter at a distance of 3 / 5-7 / 10 from the bottom of the converter.

3. A method for replacing the front bed to receive molten crude tin according to claim 1, characterized in that: The part of the converter outer wall with a vertical height of 100-200 mm below the discharge port is wrapped with a steam water jacket.

4. A method for replacing the front bed to receive molten crude tin according to claim 1, characterized in that: The temperature of the high-temperature molten crude tin in step (1) is 1150-1250°C.

5. A method for replacing a front bed to receive molten crude tin according to claim 1, characterized in that: In step (2), the temperature is lowered to below 500° C., and the cooling time is 20-40 minutes.

6. A method for replacing a front bed to receive molten crude tin according to claim 1, characterized in that: The steam pressure introduced in step (2) is ≤1 MPa.

7. A method for replacing a front bed to receive molten crude tin according to claim 1, characterized in that: In step (3), the temperature is raised to 500-700° C. and the insulation time is 30-90 minutes.

8. A method for replacing a front bed to receive molten crude tin according to claim 1, characterized in that: In step (4), the temperature is raised to 850-950° C. and the insulation time is 20-60 minutes.

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