A production method and device for roasting molybdenum concentrate

Abstract

A production method and device for roasting molybdenum concentrate, the steps of which are as follows: 1. Putting molybdenum-containing raw materials into a rotary kiln for a primary oxidation reaction; 2. The primary oxidation reaction sintered material discharged from the kiln tail enters a multi-layer reaction roasting device, and the primary oxidation reaction sintered material passes through each layer of reaction zone from top to bottom layer by layer through a circumferentially rotating material-shifting device; introducing air outside the furnace at the bottom of the multi-layer reaction roasting device, and the air outside the furnace passes through each layer of reaction zone from bottom to top to perform a secondary oxidation reaction with the primary oxidation reaction sintered material. The primary oxidation reaction is completed by using a rotary kiln, and the primary oxidation reaction sintered material then passes through the multi-layer reaction roasting device for a secondary oxidation reaction, the reaction is sufficient, the turning and operation of the material are highly automated, the turning of the material is controllable and the turning effect is good, the labor intensity of the workers is greatly reduced, the production efficiency is improved, the soluble index is stable, and the product quality is high.

Description

Technical Field

[0001] The invention relates to a method for producing molybdenum oxide, in particular to a method and device for producing roasted molybdenum concentrate. Background Art

[0002] After roasting, molybdenum ore powder is converted into molybdenum products such as molybdenum dioxide or molybdenum trioxide. At present, the roasting equipment for molybdenum ore powder is mainly rotary kiln and multi-chamber furnace. The rotary kiln has the characteristics of simple structure and low equipment investment. The production process of roasting molybdenum concentrate in rotary kiln is: one roasting, taking 1.8×30m rotary kiln as an example, a single kiln roasts about 3 tons per furnace at a time; by adding a kang surface at the end of the rotary kiln for secondary roasting, the output of a single kiln can be increased to about 5 tons per furnace, but the added kang surface requires manual turning of materials, which is labor-intensive, time-consuming and labor-intensive. In addition, the rotary kiln has strict requirements on raw materials, and the low-melting point impurities in the raw materials are high, and the quality of roasted molybdenum products is unstable. The multi-chamber furnace equipment has large investment and high output, but it is only suitable for continuous production. The process of adjusting process parameters for raw materials of different qualities is cumbersome, resulting in a lot of waste generated during the adjustment process and large economic losses. Summary of the invention

[0003] The purpose of the present invention is to provide a production method for roasting molybdenum concentrate and a multi-layer reaction roasting device, which utilizes a rotary kiln to complete a primary oxidation reaction, and the sintered material of the primary oxidation reaction is then subjected to a secondary oxidation reaction through a multi-layer reaction roasting device, the reaction is sufficient, the turning and operation of the material are highly automated, the turning of the material is controllable and the turning effect is good, the labor intensity of the workers is greatly reduced, the production efficiency is improved, the soluble index is stable, and the product grade is high.

[0004] The present invention relates to a production method of roasted molybdenum concentrate, which comprises the following steps:

[0005] 1. Put the molybdenum-containing raw materials into the rotary kiln, pass through the high temperature zone and low temperature zone from the kiln head to the kiln tail, the length of the low temperature zone is ≤5 meters, and an oxidation reaction is carried out. The temperature of the high temperature zone is 600-750℃, the temperature of the low temperature zone is 500-580℃, and the kiln body speed is 3-5min / revolution;

[0006] 2. The primary oxidation reaction sintered material discharged from the kiln tail enters the multi-layer reaction roasting device, the inner diameter of the multi-layer reaction roasting device is 3-4.5m, and the multi-layer reaction roasting device is divided into 4-6 layers of reaction zones from top to bottom. The height of each layer of reaction zone is 40-80cm. The primary oxidation reaction sintered material passes through each layer of reaction zone from top to bottom layer by layer through a circumferentially rotating material-dispensing device; the air outside the furnace is introduced into the bottom of the multi-layer reaction roasting device, and the air outside the furnace passes through each layer of reaction zone from bottom to top to perform a secondary oxidation reaction with the primary oxidation reaction sintered material, and the temperature of the bottom layer reaction zone is controlled at 550-650°C, and the rotation speed of the material-dispensing device is 5-9min / revolution to generate roasted molybdenum concentrate.

[0007] Furthermore, the Mo content of the molybdenum-containing raw material is ≥47%, and is used to generate highly soluble molybdenum oxide.

[0008] Furthermore, the Mo content of the molybdenum-containing raw material is ≥36%, and is used to generate smelting molybdenum oxide.

[0009] Furthermore, the primary oxidation reaction sintered material passes through each layer of the reaction zone from top to bottom and fully reacts with the hot air passing through the S-shaped path from bottom to top according to the S-shaped path of entering the middle and exiting the edge and entering the edge and exiting the middle.

[0010] Furthermore, the sintered material of the primary oxidation reaction moves in a spiral direction in each layer of the reaction zone.

[0011] Furthermore, the primary oxidation reaction calcined material moves in a spiral upward direction in a reaction zone provided with a central discharge port; the primary oxidation reaction calcined material moves in a spiral downward direction in a reaction zone provided with an outer edge discharge port.

[0012] A production device for roasting molybdenum concentrate comprises a rotary kiln and a multi-layer reaction roasting device. The multi-layer reaction roasting device comprises a furnace body, multi-layer reaction zones arranged up and down in the furnace body, the reaction zones from top to bottom are provided with S-shaped reaction channels with middle entry and edge exit and edge entry and middle exit, a synchronously moving material shifting device is provided in each reaction zone, a material feed port is provided at the top of the furnace body, a material discharge port is provided at the bottom of the furnace body, and an exhaust port is provided at the upper part of the side wall of the furnace body, and the special feature is that the material discharge port of the rotary kiln is connected with the material feed port of the multi-layer reaction roasting device, the furnace body diameter of the multi-layer reaction roasting device is 3-4.5m, the reaction zones of the multi-layer reaction roasting device are 4-6 layers, and the height of each layer of the reaction zone is 40-80cm.

[0013] Furthermore, the discharge port of the rotary kiln is higher than the feed port of the multi-layer reaction roasting device.

[0014] Furthermore, a feed pipe is connected between the discharge port of the rotary kiln and the feed port of the multi-layer reaction and roasting device, and the rear end of the feed pipe is tilted downward. The material discharged from the rotary kiln flows into the multi-layer reaction and roasting device through the feed pipe under the action of gravity.

[0015] Furthermore, the exhaust port of the multi-layer reaction roasting device is connected to the tail of the rotary kiln through a pipeline, and the hot air after the reaction in the multi-layer reaction roasting device returns to the tail of the rotary kiln, making full use of the waste heat to participate in the primary roasting reaction of the rotary kiln, thereby achieving energy saving.

[0016] Furthermore, the exhaust port of the multi-layer reaction and roasting device is connected to the main pipeline of the tail gas treatment system of the rotary kiln through a pipeline, so as to realize the centralized treatment of the tail gas of the multi-layer reaction and roasting device and the rotary kiln.

[0017] Furthermore, the ratio of the cross-sectional area of ​​the pipeline entering the rotary kiln tail to the cross-sectional area of ​​the pipeline entering the main pipeline of the rotary kiln tail gas treatment system is 0.1-0.2.

[0018] The beneficial effects of the present invention are:

[0019] The rotary kiln is used for a primary oxidation reaction, which reduces the length of the low-temperature zone of the rotary kiln and increases the length of the high-temperature zone accordingly. At the same time, the reaction temperature in the low-temperature zone is increased, and the time of the primary oxidation reaction is shortened. The multi-layer reaction roasting device with multi-layer reaction zones inside prolongs the travel path of the calcined material, and fully reacts with the hot air passing through the multi-layer reaction roasting device from bottom to top. In the reaction process, the material is automatically turned over, the turning effect is good, the operation is highly automated, the labor intensity of the operators is reduced, the production efficiency is improved, the soluble index is stable, and the product grade is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] In the figure: 1-rotary kiln, 2-multi-layer reaction roasting device, 3-feeding pipe, 101-exhaust treatment system main pipeline, 201-furnace body, 202-reaction zone, 203-feeding device, 204-feeding port, 205-discharging port, 206-exhaust port, 207-pipeline one, 208-pipeline two, 209-burner. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0023] Example 1

[0024] like Figure 1As shown, a production device for roasting molybdenum concentrate includes a rotary kiln 1 with a length of 30 meters and an inner diameter (excluding refractory bricks) of 1.8 meters, a multi-layer reaction roasting device 2, wherein the multi-layer reaction roasting device 2 includes a furnace body 201, and multi-layer reaction zones 202 arranged up and down in the furnace body 201. The inner diameter of the furnace body of the multi-layer reaction roasting device 2 is 3.2 meters. The reaction zones 202 of the multi-layer reaction roasting device 2 are 5 layers, and the height of each layer of the reaction zones 202 is 60 cm. The reaction zones 202 from top to bottom are provided with S-shaped reaction channels with middle inlet and edge outlet and edge inlet and middle outlet. A synchronously moving material shifting device 203 is provided in each reaction zone 202. A feed inlet 204 is provided at the top of the furnace body 201, and a feed inlet 204 is provided at the bottom of the furnace body 201. A discharge port 205 is provided, and the discharge port of the rotary kiln 1 is higher than the feed port 204 of the multi-layer reaction and roasting device 2. Burners 209 are respectively provided at the lower and upper parts of the side wall of the furnace body 201. A feed pipe 3 is connected between the discharge port of the rotary kiln 1 and the feed port 204 of the multi-layer reaction and roasting device 2. The rear end of the feed pipe 3 is inclined downward. An exhaust port 206 is provided at the upper part of the side wall of the furnace body 201. The exhaust port 206 is connected to the kiln tail of the rotary kiln 1 through a pipe 1 207 and is connected to the main pipe 101 of the exhaust gas treatment system of the rotary kiln 1 through a pipe 2 208. The ratio of the cross-sectional area of ​​the pipe 1 207 entering the kiln tail of the rotary kiln 1 to the cross-sectional area of ​​the pipe 2 208 entering the main pipe 101 of the exhaust gas treatment system of the rotary kiln 1 is 0.15.

[0025] The production method of roasted molybdenum concentrate using the roasted molybdenum concentrate production device comprises the following steps:

[0026] 1. Start the rotary kiln 1 and heat it, start the multi-layer reaction roasting device 2 and ignite the combustible gas, put the molybdenum-containing raw material with a Mo content of 52.10% into the rotary kiln 1, pass through the high temperature zone and the low temperature zone from the kiln head to the kiln tail, the high temperature zone is 25 meters long, and the low temperature zone is 5 meters long, and an oxidation reaction is carried out. The temperature in the middle section of the high temperature zone is 690°C, the temperature in the middle section of the low temperature zone is 560°C, and the kiln body rotates at 3 min / revolution;

[0027] 2. The primary oxidation reaction sintered material discharged from the kiln tail enters the multi-layer reaction roasting device 2 through the discharge pipe 3, and the primary oxidation reaction sintered material passes through each layer of reaction zone from top to bottom layer by layer; the primary oxidation reaction sintered material moves in a spiral upward direction in the reaction zone with the central discharge port; the primary oxidation reaction sintered material moves in a spiral downward direction in the reaction zone with the outer edge discharge port. The primary oxidation reaction sintered material passes through the S-shaped reaction channel and undergoes a secondary oxidation reaction with the air outside the furnace introduced from the bottom of the multi-layer reaction roasting device 2 and passing through the S-shaped reaction channel; the temperature of the bottom reaction zone is 620°C, the rotation speed of the material-dispensing device is 6min / revolution, and highly soluble molybdenum oxide is generated, with a total molybdenum content of 59.35%, a fusible molybdenum content of 58.32%, and soluble molybdenum / total molybdenum=98.26%.

[0028] Example 2

[0029] like Figure 1 As shown, a production device for roasting molybdenum concentrate includes a rotary kiln 1 with a length of 30 meters and an inner diameter (excluding refractory bricks) of 1.8 meters, a multi-layer reaction roasting device 2, wherein the multi-layer reaction roasting device 2 includes a furnace body 201, and multi-layer reaction zones 202 arranged up and down in the furnace body 201. The inner diameter of the furnace body of the multi-layer reaction roasting device 2 is 4.2 meters. The reaction zones 202 of the multi-layer reaction roasting device 2 are 5 layers, and the height of each layer of the reaction zones 202 is 70 cm. The reaction zones 202 from top to bottom are provided with S-shaped reaction channels with middle inlet and edge outlet and edge inlet and middle outlet. A synchronously moving material shifting device 203 is provided in each reaction zone 202. A material feed port 204 is provided at the top of the furnace body 201. A discharge port 205 is provided at the bottom of the furnace body 201, and the discharge port of the rotary kiln 1 is higher than the feed port 204 of the multi-layer reaction and roasting device 2. Burners 209 are respectively provided at the lower and upper parts of the side wall of the furnace body 201. A feed pipe 3 is connected between the discharge port of the rotary kiln 1 and the feed port 204 of the multi-layer reaction and roasting device 2. The rear end of the feed pipe 3 is inclined downward. An exhaust port 206 is provided at the upper part of the side wall of the furnace body 201. The exhaust port 206 is connected to the kiln tail of the rotary kiln 1 through a pipe 1 207 and is connected to the main pipe 101 of the tail gas treatment system of the rotary kiln 1 through a pipe 2 208. The ratio of the cross-sectional area of ​​the pipe 1 207 entering the kiln tail of the rotary kiln 1 to the cross-sectional area of ​​the pipe 2 208 entering the main pipe 101 of the tail gas treatment system of the rotary kiln 1 is 0.18.

[0030] The production method of roasted molybdenum concentrate using the roasted molybdenum concentrate production device comprises the following steps:

[0031] 1. Start the rotary kiln 1 and heat it, start the multi-layer reaction roasting device 2 and ignite the combustible gas, put the molybdenum-containing raw material with a Mo content of 49.05% into the rotary kiln 1, pass through the high-temperature zone and the low-temperature zone from the kiln head to the kiln tail, the high-temperature zone is 28 meters long, and the low-temperature zone is 2 meters long, and an oxidation reaction is carried out. The temperature in the middle section of the high-temperature zone is 660°C, the temperature in the middle section of the low-temperature zone is 540°C, and the kiln body rotates at 4 min / rev;

[0032] 2. The primary oxidation reaction sintered material discharged from the kiln tail enters the multi-layer reaction roasting device 2 through the discharge pipe 3. The primary oxidation reaction sintered material passes through each layer of reaction zone from top to bottom layer by layer; the primary oxidation reaction sintered material moves in a spiral upward direction in the reaction zone with the central discharge port; the primary oxidation reaction sintered material moves in a spiral downward direction in the reaction zone with the outer edge discharge port. The primary oxidation reaction sintered material passes through the S-shaped reaction channel and undergoes a secondary oxidation reaction with the air outside the furnace introduced from the bottom of the multi-layer reaction roasting device 2 and passing through the S-shaped reaction channel. The temperature of the bottom reaction zone is controlled at 590°C, and the speed of the material-dispensing device is 8min / revolution, generating highly soluble molybdenum oxide, with a total molybdenum content of 56.15%, a fusible molybdenum content of 54.91%, and soluble molybdenum / total molybdenum = 97.79%.

[0033] Example 3

[0034] The roasted molybdenum concentrate production device has the same structure as that of Example 2.

[0035] The production method of roasted molybdenum concentrate using the roasted molybdenum concentrate production device comprises the following steps:

[0036] 1. Start the rotary kiln 1 and heat it, start the multi-layer reaction roasting device 2 and ignite the combustible gas, put the molybdenum-containing raw material with a Mo content of 36.68% into the rotary kiln 1, pass through the high-temperature zone and the low-temperature zone from the kiln head to the kiln tail, the high-temperature zone is 28 meters long, and the low-temperature zone is 2 meters long, and an oxidation reaction is carried out. The temperature in the middle section of the high-temperature zone is 650°C, the temperature in the middle section of the low-temperature zone is 550°C, and the kiln body rotates at a speed of 3.5min / revolution;

[0037] 2. The primary oxidation reaction sintered material discharged from the kiln tail enters the multi-layer reaction roasting device 2 through the discharge pipe 3. The primary oxidation reaction sintered material passes through each layer of reaction zone from top to bottom layer by layer; the primary oxidation reaction sintered material moves in a spiral upward direction in the reaction zone with the central discharge port; the primary oxidation reaction sintered material moves in a spiral downward direction in the reaction zone with the outer edge discharge port. The primary oxidation reaction sintered material passes through the S-shaped reaction channel and undergoes a secondary oxidation reaction with the air outside the furnace introduced from the bottom of the multi-layer reaction roasting device 2 and passing through the S-shaped reaction channel. The temperature of the bottom reaction zone is controlled at 600°C, and the speed of the material-dispensing device is 7min / rev, to generate smelting molybdenum oxide with a molybdenum content of 41.14% and a sulfur content of 0.076%.

[0038] Example 4

[0039] like Figure 1As shown, a production device for roasting molybdenum concentrate includes a rotary kiln 1 with a length of 30 meters and an inner diameter (excluding refractory bricks) of 1.8 meters, a multi-layer reaction roasting device 2, wherein the multi-layer reaction roasting device 2 includes a furnace body 201, and multi-layer reaction zones 202 arranged up and down in the furnace body 201. The inner diameter of the furnace body of the multi-layer reaction roasting device 2 is 3.8 meters. The reaction zones 202 of the multi-layer reaction roasting device 2 are 5 layers, and the height of each layer of the reaction zones 202 is 65 cm. The reaction zones 202 from top to bottom are provided with S-shaped reaction channels with middle inlet and edge outlet and edge inlet and middle outlet. A synchronously moving material shifting device 203 is provided in each reaction zone 202. A feed inlet 204 is provided at the top of the furnace body 201, and a feed inlet 204 is provided at the bottom of the furnace body 201. A discharge port 205 is provided, and the discharge port of the rotary kiln 1 is higher than the feed port 204 of the multi-layer reaction and roasting device 2. Burners 209 are respectively provided at the lower and upper parts of the side wall of the furnace body 201. A feed pipe 3 is connected between the discharge port of the rotary kiln 1 and the feed port 204 of the multi-layer reaction and roasting device 2. The rear end of the feed pipe 3 is inclined downward. An exhaust port 206 is provided at the upper part of the side wall of the furnace body 201. The exhaust port 206 is connected to the kiln tail of the rotary kiln 1 through a pipe 1 207 and is connected to the main pipe 101 of the exhaust gas treatment system of the rotary kiln 1 through a pipe 2 208. The ratio of the cross-sectional area of ​​the pipe 1 207 entering the kiln tail of the rotary kiln 1 to the cross-sectional area of ​​the pipe 2 208 entering the main pipe 101 of the exhaust gas treatment system of the rotary kiln 1 is 0.12.

[0040] The production method of roasted molybdenum concentrate using the roasted molybdenum concentrate production device comprises the following steps:

[0041] 1. Start the rotary kiln 1 and heat it, start the multi-layer reaction roasting device 2 and ignite the combustible gas, put the molybdenum-containing raw material with a Mo content of 44.32% into the rotary kiln 1, pass through the high-temperature zone and the low-temperature zone from the kiln head to the kiln tail, the high-temperature zone is 27 meters long and the low-temperature zone is 3 meters long, and an oxidation reaction is carried out. The temperature in the middle section of the high-temperature zone is 670°C, the temperature in the middle section of the low-temperature zone is 545°C, and the kiln body rotates at 4 min / rev;

[0042] 2. The primary oxidation reaction sintered material discharged from the kiln tail enters the multi-layer reaction roasting device 2 through the discharge pipe 3. The primary oxidation reaction sintered material passes through each layer of reaction zone from top to bottom layer by layer; the primary oxidation reaction sintered material moves in a spiral upward direction in the reaction zone with the central discharge port; the primary oxidation reaction sintered material moves in a spiral downward direction in the reaction zone with the outer edge discharge port. The primary oxidation reaction sintered material passes through the S-shaped reaction channel and undergoes a secondary oxidation reaction with the air outside the furnace introduced from the bottom of the multi-layer reaction roasting device 2 and passing through the S-shaped reaction channel. The temperature of the bottom reaction zone is controlled at 585°C, and the rotation speed of the material-dispensing device is 8min / revolution, generating smelting molybdenum oxide with a total molybdenum content of 49.48% and a sulfur content of 0.062%.

[0043] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production method for roasting molybdenum concentrate, characterized in that Here are the steps: 1) Put the molybdenum-containing raw materials into the rotary kiln, pass through the high temperature zone and low temperature zone from the kiln head to the kiln tail, the length of the low temperature zone is ≤5 meters, and an oxidation reaction is carried out. The temperature of the high temperature zone is 600-750℃, the temperature of the low temperature zone is 500-580℃, and the kiln body speed is 3-5min / revolution; 2) The primary oxidation reaction calcined material discharged from the kiln tail enters the multi-layer reaction roasting device, the inner diameter of the multi-layer reaction roasting device is 3-4.5m, and the multi-layer reaction roasting device is divided into 4-6 layers of reaction zones from top to bottom. The height of each layer of reaction zone is 40-80cm. The primary oxidation reaction calcined material passes through each layer of reaction zone from top to bottom layer by layer through a circumferentially rotating material-dispensing device; the air outside the furnace is introduced into the bottom of the multi-layer reaction roasting device, and the air outside the furnace passes through each layer of reaction zone from bottom to top, and undergoes a secondary oxidation reaction with the primary oxidation reaction calcined material, and the temperature of the bottom layer reaction zone is controlled at 550-650°C, and the rotation speed of the material-dispensing device is 5-9min / revolution to generate roasted molybdenum concentrate.

2. The method for producing a roasted molybdenum concentrate according to claim 1, wherein: The Mo content of the molybdenum-containing raw material is ≥47%.

3. The method for producing a roasted molybdenum concentrate according to claim 1, wherein: The Mo content of the molybdenum-containing raw material is ≥36%.

4. The method for producing a roasted molybdenum concentrate according to claim 1, wherein: The sintered material of the primary oxidation reaction passes through each layer of the reaction zone from top to bottom and fully reacts with the hot air passing through the S-shaped path from bottom to top according to the S-shaped path of entering the middle and exiting the edge and entering the edge and exiting the middle.

5. The method for producing a roasted molybdenum concentrate according to claim 1, characterized in that: The sintered material of the primary oxidation reaction moves in a spiral direction in each layer of the reaction zone.

6. The method for producing a roasted molybdenum concentrate according to claim 5, characterized in that: The primary oxidation reaction sintered material moves in a spiral upward direction in a reaction zone provided with a central discharge port; the primary oxidation reaction sintered material moves in a spiral downward direction in a reaction zone provided with an outer edge discharge port.

7. A roasting molybdenum concentrate production device, characterized in that: The invention comprises a rotary kiln and a multi-layer reaction roasting device, wherein the multi-layer reaction roasting device comprises a furnace body, and multi-layer reaction zones arranged up and down in the furnace body, and the reaction zones from top to bottom are provided with S-shaped reaction channels with middle inlet and edge outlet and edge inlet and middle outlet, and synchronously moving material shifting devices are provided in each reaction zone, a material inlet is provided at the top of the furnace body, a material outlet is provided at the bottom of the furnace body, and an exhaust port is provided at the upper part of the side wall of the furnace body, and the special features thereof are: The discharge port of the rotary kiln is connected to the feed port of the multi-layer reaction and roasting device. The inner diameter of the multi-layer reaction and roasting device is 3-4.5m. The reaction zone of the multi-layer reaction and roasting device is 4-6 layers, and the height of each layer of the reaction zone is 40-80cm.

8. A roasted molybdenum concentrate production device according to claim 7, characterized in that: The discharge port of the rotary kiln is higher than the feed port of the multi-layer reaction and roasting device, a feed pipe is connected between the discharge port of the rotary kiln and the feed port of the multi-layer reaction and roasting device, and the rear end of the feed pipe is inclined downward.

9. A roasted molybdenum concentrate production device according to claim 8, characterized in that: The exhaust port of the multi-layer reaction roasting device is connected to the kiln tail of the rotary kiln through a pipeline.

10. A roasted molybdenum concentrate production device according to claim 8 or 9, characterized in that: The exhaust port of the multi-layer reaction roasting device is connected to the main pipeline of the tail gas treatment system of the rotary kiln through a pipeline, and the ratio of the cross-sectional area of ​​the pipeline entering the tail of the rotary kiln to the cross-sectional area of ​​the pipeline entering the main pipeline of the tail gas treatment system of the rotary kiln is 0.1-0.2.

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