Dedusting ash treatment device

Abstract

The invention provides a fly ash treatment device, and relates to industrial fly ash treatment equipment, the device comprises a first bin group, a pelletizing assembly, a rotary kiln and a screening assembly; the first stock bin group is used for storing various types of fly ash respectively; a first valve, a first weighing machine and a humidifier are arranged on a first discharging pipe of the first stock bin, and the first valve is normally closed; a first belt conveyor for conveying fly ash is arranged at the output end of the first stock bin group; the pelletizing assembly is arranged at the output end of the first belt conveyor, and the pelletizing assembly is used for mixing and preparing finished product pellets; a second belt conveyor for conveying finished product balls is arranged at the output end of the pelletizing assembly; the input end of the rotary kiln is arranged at the output end of the second belt conveyor; the screening assembly is arranged beside the kiln slag groove and used for grabbing kiln slag and screening the kiln slag according to the particle size, and large-particle kiln slag, medium-particle kiln slag and small-particle kiln slag are obtained. From dust collection to waste residue classification, targeted treatment measures are taken for products with different particle sizes, so that resource recovery is realized, and the treatment efficiency is improved.

Description

Technical Field

[0001] The invention relates to industrial dust removal ash processing equipment, in particular to a dust removal ash processing device. Background Art

[0002] In metal smelting, chemical production and other industrial processes, dust (dust or smoke) is an inevitable by-product. Dust not only contains valuable metal components, but also contains harmful substances such as heavy metals and sulfides. Therefore, how to efficiently treat these dusts to achieve resource recovery and reduce environmental pollution has become an important issue facing the industry. The existing dust treatment device captures and concentrates the dust-containing gas flow from the production process to obtain the dust that has not fallen to the ground (i.e., the dust just produced). The collected dust is preliminarily treated, such as improving its physical properties by cooling and humidifying, and using physical methods (such as magnetic separation, gravity separation, flotation, etc.) or chemical methods (such as hydrometallurgy, reduction roasting, etc.) to separate valuable metal components from the dust, and treats the separated waste slag, wastewater and other secondary pollutants to ensure compliance with environmental emission standards. With the development of industry, not only the newly produced dust dust needs to be processed, but also the dust dust that has fallen to the ground needs to be processed, which greatly increases the dust dust processing volume. Although the existing dust dust processing device has certain functions, the processing effect is greatly reduced when processing a large amount of dust dust. Summary of the invention

[0003] The purpose of the present invention is to provide a dust treatment device, and the technical problem to be solved is how to treat industrial dust and realize resource recovery.

[0004] The present invention is achieved through the following technical solutions:

[0005] A dust removal ash processing device comprises a first silo group, a pelletizing assembly, a rotary kiln and a screening assembly;

[0006] The first silo group includes a plurality of first silos, each of which is used to store dust collected from various channels; a first discharge pipe is provided at the bottom of the first silo, and a first valve, a first weighing device and a humidifier are provided in sequence on the first discharge pipe in a direction away from the first silo, the first valve is normally closed, the first weighing device is used to weigh the discharged dust, and the humidifier is used to humidify the discharged dust; a first belt conveyor is provided directly below the first silo group, and the first belt conveyor is used to convey the dust discharged from the first discharge pipe;

[0007] The ball-making assembly is arranged at the output end of the first belt conveyor, and is used to mix the dust-removed ash outputted from each first silo, and make the mixed dust-removed ash into a plurality of finished balls; a second belt conveyor is arranged at the output end of the ball-making assembly, and the second belt conveyor is used to transport the finished balls;

[0008] The input end of the rotary kiln is arranged at the output end of the second belt conveyor, and a slag trough is arranged at the output end of the rotary kiln;

[0009] The screening component is arranged beside the slag trough, and is used to grab the slag in the slag trough, screen the slag according to the particle size, and obtain large-particle slag, medium-particle slag and small-particle slag.

[0010] The dust ash collected from different sources is stored separately by the first silo group, which is helpful for classification management according to the characteristics of dust ash from different sources; the weigher and humidifier equipped with the first discharge pipe can quantitatively control the dust ash and improve its physical properties (such as increasing humidity), which is conducive to stability and safety in the subsequent processing. The ball-making component is used to mix various types of dust ash to form finished balls. This molding process helps to enhance the mechanical strength of the material, reduce the dust generated during transportation and handling, and also improve the reactivity of the material during heat treatment; the rotary kiln provides conditions for high-temperature treatment, so that the metal components contained in the dust ash can be more effectively separated under high-temperature conditions; at the same time, the rotary kiln can also promote the occurrence of chemical reduction reactions, further improving the metal recovery rate; the screening component can classify the kiln slag according to the particle size, so as to facilitate targeted treatment measures for products of different particle sizes. For example, large particles may contain a higher metal content and can be directly used as secondary raw materials; while small particles may need further treatment to remove harmful substances or recover residual value. The entire device realizes a one-stop service from dust ash collection to waste slag classification, which not only simplifies the operation process, but also improves the processing efficiency.

[0011] Furthermore, the treatment device also includes a flue gas purification component, which includes a settling chamber, a main surface cooler and a main dust collector. The input end of the settling chamber is connected to the gas output end of the rotary kiln, the output end of the settling chamber is connected to the input end of the main surface cooler, and the output end of the main surface cooler is connected to the input end of the main dust collector.

[0012] The above-mentioned flue gas purification component is used to treat the flue gas generated during dust removal, so that the metal in the flue gas is settled, thereby reducing the pollution to the environment. Specifically, the settling chamber is the first line of defense, mainly used to remove larger particles of dust or incompletely reacted materials. When the high-temperature gas is output from the rotary kiln and enters the settling chamber, the settling chamber is also the oxidation space of non-ferrous metal vapor. Due to the reduced flow rate, the heavier particles will settle to the bottom of the settling chamber due to gravity, thus achieving preliminary gas purification. The main surface cooler is used to cool the high-temperature flue gas from the settling chamber; through cooling, on the one hand, it can prevent the subsequent equipment from being damaged due to high temperature, and on the other hand, it also makes certain pollutants in the flue gas (such as volatile organic compounds) easier to be captured or condensed, thereby improving the subsequent treatment efficiency. After the previous pretreatment, the flue gas enters the main dust collector for the final fine dust removal to achieve the best dust removal effect. The flue gas treated by the main dust collector also contains sulfur and nitrate. The flue gas output by the main dust collector can be connected to the desulfurization and denitrification system to meet the local environmental protection emission standards before it can be discharged into the atmosphere. Flue gas purification components not only help protect the environment and reduce the emission of harmful substances, but also may recycle some valuable by-products. For example, the dust collected from the settling chamber, main surface cooler and main dust collector can be directly returned to the production line as raw materials (finished products).

[0013] Furthermore, the above-mentioned sedimentation chamber includes a plurality of arranged sedimentation bins, a water tank is arranged on the top of the above-mentioned sedimentation bin, and the water tank is used to cool the flue gas; a first ash hopper is arranged at the bottom of the above-mentioned sedimentation bin, and the above-mentioned first ash hopper is used to store the ash settled in the sedimentation bin; a first scraper is arranged below the above-mentioned sedimentation chamber, and the above-mentioned first scraper is used to collect the ash output by the first ash hopper.

[0014] Furthermore, a second ash hopper is provided at the bottom of the main surface cooler, and the second ash hopper is used to store the ash settled in the main surface cooler; a second scraper is provided below the main surface cooler, and the second scraper is used to collect the ash output by the second ash hopper.

[0015] Furthermore, a third ash hopper is arranged at the bottom of the main dust collector, and the third ash hopper is used to store the ash settled in the main dust collector; a third scraper is arranged below the main dust collector, and the third scraper is used to collect the ash output by the third ash hopper.

[0016] Dividing the settling chamber into multiple settling bins increases the residence time of flue gas in the chamber, thereby ensuring the settling effect. The water tank at the top of the settling chamber can cool the high-temperature flue gas directly or indirectly to reduce its temperature. It can also condense some soluble substances, so that the condensed substances settle under the action of gravity, which plays a role in preliminary purification of the flue gas. The ash hopper set at the bottom of the settling chamber, the main surface cooler and the main dust collector is used to collect the settled ash, and the scraper is used to transport the ash to the designated location for subsequent processing or storage. This design avoids the need for manual cleaning, improves work efficiency, and reduces the risk of operators being exposed to harmful environments. The ash collected by each ash hopper can be classified and processed according to different components to maximize the utilization of resources.

[0017] Furthermore, the processing device also includes a second silo group, the second silo group includes a plurality of second silos, each second silo is used to store dust collected from various paths;

[0018] A second discharge pipe is arranged at the bottom of the second silo, and a second valve and a second weighing device are arranged in sequence on the second discharge pipe in the direction away from the second silo. The second valve is normally closed, and the second weighing device is used to weigh the discharged dust ash. The second discharge pipe of the second silo group is arranged directly above the first belt conveyor.

[0019] The second silo group is similar to the first silo group and can store dust collected from different sources separately, which not only increases the storage capacity and storage type, but also allows more flexible management of dust from different sources and properties. The second discharge pipe of the second silo is not equipped with a humidifier, so that the dust in the pelletizing assembly can increase or decrease humidity, so that the humidity of the mixed dust is within the expected range, which improves the viscosity of the dust and facilitates subsequent granulation.

[0020] Furthermore, the first silo and the second silo are both provided with silo wall vibrators.

[0021] The main function of the above-mentioned silo wall vibrator is to prevent the material from adhering to or bridging the inner wall of the silo and ensure the smooth flow of dust. Fine particles such as dust are easily adhered to the inner wall of the silo due to static electricity, humidity and other reasons. Long-term accumulation will cause blockage, affecting the continuity and accuracy of the discharge; the silo wall vibrator can effectively reduce the adhesion phenomenon through periodic vibration to ensure the smooth fall of the material. Fine powder materials may form the so-called "bridge" structure when they are stationary, that is, the materials form an arched accumulation at the discharge port, which hinders the outflow of materials. The vibration generated by the silo wall vibrator can destroy these bridging structures, so that the materials maintain good fluidity and ensure smooth discharge. Vibration helps to distribute the materials more evenly inside the silo, reducing the possibility of material stratification, thereby ensuring the stability and consistency of the material composition at each discharge, which is very important for the proportioning operation in the subsequent process. With the help of the silo wall vibrator, the frequency of manual cleaning required due to material blockage can be reduced, which not only saves labor costs, but also improves the automation level and reliability of the system.

[0022] Furthermore, a dust removal bag is provided at the end of the rotary kiln.

[0023] The above-mentioned dust removal bags are high temperature resistant bags, which ensure that no smoke and dust overflow from the kiln head of the rotary kiln.

[0024] Furthermore, the screening assembly comprises a grabbing device, a slag bin and a vibrating screen, wherein the grabbing device is used to grab the slag in the slag trough and move the grabbed slag to the slag bin;

[0025] A feeder is provided at the output end of the slag bin, and the output end of the feeder is arranged just above the vibrating screen;

[0026] The vibrating screen includes a screen and a buffer bin group. The screen is tilted and the buffer bin group is arranged directly below the screen. The buffer bin group includes at least two buffer bins, which are used to collect medium-particle kiln slag and small-particle kiln slag respectively. Large-particle kiln slag can fall directly to the ground.

[0027] The slag is grabbed from the slag trough by the above-mentioned grabbing device and moved to the slag silo. The slag silo serves as a temporary storage point and can hold a certain amount of slag waiting for subsequent processing, which helps to balance the production rhythm and maintain a stable supply even when the slag production speed fluctuates. The feeder arranged at the output end of the slag silo is used to quantitatively and evenly transport the slag to the top of the vibrating screen, ensuring that the material flow entering the vibrating screen is controllable, which is beneficial to improving the screening effect. The inclination angle of the screen helps the material to slide naturally along the slope, so that slag of different particle sizes can be effectively separated. The buffer bin group collects particles of different size ranges respectively.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] The dust ash collected from different sources is stored separately by the first silo group, which is helpful for classification management according to the characteristics of dust ash from different sources; the weigher and humidifier equipped with the first discharge pipe can quantitatively control the dust ash and improve its physical properties (such as increasing humidity), which is conducive to stability and safety in the subsequent processing. The ball-making component is used to mix various types of dust ash to form finished balls. This molding process helps to enhance the mechanical strength of the material, reduce the dust generated during transportation and handling, and also improve the reactivity of the material during heat treatment; the rotary kiln provides conditions for high-temperature treatment, so that the metal components contained in the dust ash can be more effectively separated under high-temperature conditions; at the same time, the rotary kiln can also promote the occurrence of chemical reduction reactions, further improving the metal recovery rate; the screening component can classify the kiln slag according to the particle size, so as to facilitate targeted treatment measures for products of different particle sizes. For example, large particles may contain a higher metal content and can be directly used as secondary raw materials; while small particles may need further treatment to remove harmful substances or recover residual value. The entire device realizes a one-stop service from dust ash collection to waste slag classification, which not only simplifies the operation process, but also improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0031] Figure 1 It is the overall connection diagram;

[0032] Figure 2 It is an enlarged schematic diagram of the first silo group, the second silo group and the pelletizing assembly;

[0033] Figure 3 It is an enlarged schematic diagram of the rotary kiln and the flue gas purification component;

[0034] Figure 4 An enlarged schematic diagram of the rotary kiln and screening assembly.

[0035] Marks and corresponding parts names in the attached drawings:

[0036] 1. Rotary kiln; 11. Slag trough; 2. Screening assembly; 21. Grabbing device; 22. Slag silo; 23. Feeder; 24. Vibrating screen; 25. Buffer silo group; 3. First silo group; 31. First valve; 32. First weigher; 33. Humidifier; 34. Silo wall vibrator; 4. First belt conveyor; 5. Balling assembly; 51. Plough discharger; 52. Third belt conveyor; 53. Fourth belt conveyor; 54. Double-axis humidifying mixer; 55. Disc pelletizing machine; 56. Powerful mixer; 6. Second belt conveyor; 7. Flue gas purification assembly; 71. Sedimentation chamber; 72. Main surface cooler; 73. Main dust collector; 74. First ash hopper; 75. Second ash hopper; 76. Third ash hopper; 77. First scraper; 78. Second scraper; 79. Third scraper; 8. Second silo group; 81. Second valve; 82. Second weigher. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0038] The following devices can be used to collect zinc powder from industrial dust.

[0039] First embodiment:

[0040] A dust removal ash processing device comprises a first silo group 3, a pelletizing component 5, a rotary kiln 1 and a screening component 2, such as Figure 1 and Figure 2 As shown;

[0041] The first silo group 3 includes a plurality of first silos, each of which is used to store dust collected from various channels; a first discharge pipe is provided at the bottom of the first silo, and a first valve 31, a first weighing device 32 and a humidifier 33 are provided in sequence on the first discharge pipe in a direction away from the first silo, the first valve 31 is normally closed, the first weighing device 32 is used to weigh the discharged dust, and the humidifier 33 is used to humidify the discharged dust; a first belt conveyor 4 is provided directly below the first silo group 3, and the first belt conveyor 4 is used to convey the dust output from the first discharge pipe;

[0042] The ball-making assembly 5 is arranged at the output end of the first belt conveyor 4, and is used to mix the dust removed from each first silo, and make the mixed dust removed into a plurality of finished balls; the output end of the ball-making assembly 5 is provided with a second belt conveyor 6, and the second belt conveyor 6 is used to transport the finished balls;

[0043] The input end of the rotary kiln 1 is arranged at the output end of the second belt conveyor 6, and a slag trough 11 is arranged at the output end of the rotary kiln 1;

[0044] The screening component 2 is arranged beside the slag trough 11. The screening component 2 is used to grab the slag in the slag trough 11 and screen the slag according to the particle size to obtain large-particle slag, medium-particle slag and small-particle slag.

[0045] The first silo group 3 is used to store dust ash collected from different sources, which is helpful for classification management according to the characteristics of dust ash from different sources; the weigher and humidifier 33 equipped with the first discharge pipe can quantitatively control the dust ash and improve its physical properties (such as increasing humidity), which is beneficial to the stability and safety of the subsequent processing. The ball-making component 5 is used to mix various types of dust ash to form finished balls. This molding process helps to enhance the mechanical strength of the material, reduce the dust generated during transportation and handling, and also improve the reactivity of the material during heat treatment; the rotary kiln 1 provides conditions for high-temperature treatment, so that the metal components contained in the dust ash can be more effectively separated under high-temperature conditions; at the same time, the rotary kiln 1 can also promote the occurrence of chemical reduction reactions, further improving the metal recovery rate; the screening component 2 can classify the kiln slag according to the particle size, so as to facilitate the adoption of targeted treatment measures for products of different particle sizes. For example, large particles may contain a higher metal content and can be directly used as secondary raw materials; while small particles may need further treatment to remove harmful substances or recover residual value. The entire device realizes one-stop service from dust collection to waste residue classification, which not only simplifies the operation process but also improves processing efficiency.

[0046] For reference, combined with Figure 2 There are 7 first silos, including 6 closed silos and 1 underground silo. Each silo stores dust ash collected from the same collection route. The collected dust ash includes bag ash entering the kiln, steelmaking dust ash, blast furnace dry ash, converter primary ash and transfer station dust ash. Bag ash entering the kiln and steelmaking dust ash are newly produced dust ash, which are collected and transported by suction and discharge tank trucks and transported to the closed silos through pneumatic ash conveying pipelines. Among them, two closed silos are equipped with a group of pneumatic ash conveying pipelines; each first One silo can be provided with two silo wall vibrators 34 and two air cannons. The feed pipe of the first silo is provided with an automatic control valve and a remote weighing continuous level meter and a limit meter to monitor the raw material reserves in real time. The first valve 31 arranged under the closed silo can be an electro-hydraulic plug valve and a star-shaped ash discharge valve, and the first weigher 32 can be a spiral scale. A dust collector and a safety discharge system can be arranged on the top of the first silo, and an environmental dust removal can be arranged in the batching workshop to ensure that the environment of the batching workshop meets the requirements of relevant national standards.

[0047] Blast furnace dry ash, converter primary ash and transfer station dust removal ash belong to dust removal ash that has fallen to the ground, which is transported to the site by dump trucks and unloaded to the underground silo; the underground silo is equipped with wear-resistant anti-sticking lining plates, silo wall vibrators 34 and fixed grids, and the first weighing device 32 installed under the underground silo can be a belt weighing feeder 23, and a humidifier 33 is installed at the rear of the belt weighing feeder 23. Among them, the silo is sealed with the unloading area of ​​the car, and the underground silo area is equipped with environmental dust removal facilities and mist emitters to reduce dust pollution and ensure that the underground silo environment meets relevant standards.

[0048] The pelletizing assembly 5 can be composed of a plow type discharger 51, a third belt conveyor 52, a fourth belt conveyor 53, a double-axis humidifying mixer 54 (or a strong mixer 56) and a disc pelletizing machine 55. The plow type discharger 51 is arranged on the first belt conveyor 4, and is used to receive the dust removed by the first belt conveyor 4; the output end of the plow type discharger 51 is arranged directly above the input end of the third belt conveyor 52, the output end of the third belt conveyor 52 is arranged directly above the input end of the fourth belt conveyor 53, and the output end of the fourth belt conveyor 53 is arranged directly above the input end of the second belt conveyor 6; the input end of the double-axis humidifying mixer 54 is arranged directly below the output end of the first belt conveyor 4, the output end of the double-axis humidifying mixer 54 is connected to the input end of the disc pelletizing machine 55, and the output end of the disc pelletizing machine 55 is located directly above the fourth belt conveyor 53.

[0049] Each dust-collected ash is quantitatively proportioned by the first valve 31 and the first weigher 32 and then transported to the humidifier 33 for humidification. After humidification, it is transported to the double-shaft humidifying mixer 54 for mixing via the first belt conveyor 4. The mixed dust-collected ash enters the disc ball making machine 55 for granulation. A certain amount of water is added during the granulation process to make the moisture content of the granulated material 10% to 20%, and the finished balls are obtained. The finished balls are transported to the rotary kiln 1 via the fourth belt conveyor 53 and the second belt conveyor 6. Since the first belt conveyor 4 is provided with a plow discharger 51, the dust-collected ash can be directly transported to the third belt conveyor 52 without passing through the double-shaft humidifying mixer 54. The finished balls are transported to the upper part of the settling chamber 71 via the second belt conveyor 6, and slip into the tail of the rotary kiln 1 through the discharge pipe. The inflowing finished balls rotate and flow from the kiln tail to the kiln head in the rotary kiln 1. When controlling the discharge of materials from the first silo, the processing system can analyze and calculate the required weights of different dust ash according to the dust ash composition data and the requirements for the composition of the mixed material entering the kiln, and automatically discharge the materials after weighing and mixing by the electro-hydraulic plug valve, star-shaped ash discharge valve, spiral scale, and humidifier 33, to ensure the stability and uniform proportion of the various components of the mixed material.

[0050] In a specific embodiment, the kiln head of the rotary kiln 1 is provided with a dust removal bag (not shown in the figure). The dust removal bag is a high temperature resistant bag to ensure that there is no smoke and dust overflow from the kiln head of the rotary kiln 1. The concentration of dust-exhausted particles is less than 10 mg / Nm3. The refractory material in the kiln is made of high-temperature dense phosphate bricks of international or national well-known brands, which have good thermal shock stability, strong resistance to mechanical stress, and high resistance to chemical erosion. The kiln head is also provided with a combustion-supporting fan (such as Figure 3 As shown), it can effectively adjust the atmosphere and temperature field distribution in the kiln.

[0051] Second embodiment:

[0052] Based on the first embodiment, Figure 3 The treatment device also includes a flue gas purification component 7, which includes a settling chamber 71, a main surface cooler 72 and a main dust collector 73. The input end of the settling chamber 71 is connected to the gas output end of the rotary kiln 1, the output end of the settling chamber 71 is connected to the input end of the main surface cooler 72, and the output end of the main surface cooler 72 is connected to the input end of the main dust collector 73.

[0053] As the finished balls flow forward in the rotary kiln 1, they are dried, preheated, heated, calcined, and other processes. In a reducing atmosphere, the zinc-containing substance is reduced to zinc vapor, which combines with oxygen to form zinc oxide. Lead, bismuth, tin, indium and other metals are volatilized together with zinc in the same principle to form multi-metal oxides, commonly known as secondary zinc oxide, which enter the rear end of the settling chamber 71 with the flue gas.

[0054] The above-mentioned flue gas purification component 7 is used to treat the flue gas generated during dust removal, so that the metal in the flue gas is settled, thereby reducing the pollution to the environment. Specifically, the settling chamber 71 is used as the first line of defense, mainly for removing larger particles of dust or incompletely reacted materials. When the high-temperature gas is output from the rotary kiln 1 and enters the settling chamber 71, the settling chamber 71 is also the oxidation space of the non-ferrous metal vapor. Due to the reduction in flow rate, the heavier particles will settle to the bottom of the settling chamber 71 due to gravity, thus achieving preliminary gas purification. The main surface cooler 72 is used to cool the high-temperature flue gas from the settling chamber 71; through cooling, on the one hand, it can prevent subsequent equipment from being damaged due to high temperature, and on the other hand, it also makes certain pollutants in the flue gas (such as volatile organic compounds) easier to be captured or condensed, thereby improving the efficiency of subsequent processing. After the previous pretreatment, the flue gas enters the main dust collector 73 for the final fine dust removal to achieve the best dust removal effect. The flue gas treated by the main dust collector 73 still contains sulfur and nitrate. The flue gas output by the main dust collector 73 can be connected to the desulfurization and denitrification system to meet the local environmental protection emission standards before it can be discharged into the atmosphere. According to actual needs, the main dust collector 73 can adopt a variety of methods such as bag dust removal, electrostatic dust removal or wet dust removal. The flue gas purification component 7 not only helps to protect the environment and reduce the emission of harmful substances, but also may recover some valuable by-products. For example, the dust collected from the settling chamber 71, the main surface cooler 72 and the main dust collector 73 can be directly returned to the production line as raw materials (finished products).

[0055] In a specific embodiment, the above-mentioned sedimentation chamber 71 includes a plurality of arranged sedimentation bins, a water tank is arranged on the top of the above-mentioned sedimentation bin, and the water tank is used to cool the flue gas; a first ash hopper 74 is arranged at the bottom of the above-mentioned sedimentation bin, and the above-mentioned first ash hopper 74 is used to store the ash settled in the sedimentation bin; a first scraper 77 is arranged below the above-mentioned sedimentation chamber 71, and the above-mentioned first scraper 77 is used to collect the ash output by the first ash hopper 74.

[0056] The above rotary kiln 1 is equipped with a settling chamber 71 at the tail end. The flue gas temperature at the tail end of the rotary kiln 1 is 550±100℃. A water tank is arranged on the top to assist in cooling the flue gas. After preliminary purification of the flue gas by gravity settling, the flue gas enters the main surface cooler 72 from the tail end of the settling chamber 71. The kiln tail settling chamber 71 is responsible for the settling of large dust particles at the front end. The settling chamber 71 is also the oxidation space for non-ferrous metal vapor. The larger particle size particles in the flue gas settle to the first ash hopper 74. The first ash hopper 74 can be provided with a bin wall vibrator 34 and an electro-hydraulic gate valve. The ash is collected by the first scraper 77. Two discharge processes are set: the first settling bin can be returned to the kiln slag trough 11 at the tail end of the rotary kiln 1 through a bucket elevator, and the remaining ash is centrally processed by the scraper; the zinc oxide flue gas and fine particles that meet the standards enter the next equipment. The settling chamber 71 is designed as a frame structure, and uses refractory materials with a small thermal expansion coefficient, good thermal insulation effect, resistance to rapid cooling and heating, and good wear resistance. Explosion-proof valves can be installed on both sides of the settling chamber 71 at a high point. The cross-sectional area of ​​the settling chamber 71 is used to reduce the flow rate of the flue gas, and at the same time there is a sufficient settling length section to ensure the settling effect.

[0057] In a specific embodiment, a second ash hopper 75 is provided at the bottom of the main cooler 72 , and the second ash hopper 75 is used to store the ash settled in the main cooler 72 ; a second scraper 78 is provided below the main cooler 72 , and the second scraper 78 is used to collect the ash output by the second ash hopper 75 .

[0058] The flue gas is cooled by the surface cooler. The flue gas enters the surface cooler and its cooling temperature drops to below 180°C before entering the main dust collector 73. The surface cooler adopts a herringbone cooling pipe (carbon steel), an inlet and outlet pipe (carbon steel) and a second ash hopper 75 structure. The branch pipes of the surface cooler are arranged in four rows and multiple groups. The upper herringbone pipe uses heat radiation and heat convection to dissipate heat to the environment to reduce the flue gas temperature. The lower second ash hopper 75 collects low-zinc particles brought by the upstream flue gas step by step to improve the purity of the zinc oxide product. The cooling area of ​​the surface cooler is adjustable, and a silo wall vibrator 34 is provided to prevent adhesion. The flue gas after cooling and dust removal enters the main dust collector 73 at the rear end. The second ash hopper 75 is provided with a scraper for centralized discharge. The dust that falls to the ground can be returned to the first silo or sent to the finished product warehouse for storage by a flatbed truck.

[0059] In a specific embodiment, a third ash hopper 76 is provided at the bottom of the main dust collector 73, and the third ash hopper 76 is used to store the ash settled in the main dust collector 73; a third scraper 79 is provided below the main dust collector 73, and the third scraper 79 is used to collect the ash output by the third ash hopper 76.

[0060] The main dust collector 73 is set at the outlet of the surface cooler and has 4 chambers. The inlet flue gas temperature is less than 180℃, the outlet flue gas temperature is greater than 160℃, the inlet concentration is less than 50g / Nm3, and the outlet concentration is less than 10mg / Nm3. The third ash hopper 76 is equipped with an electric gate valve and high and low material level meters. The collected zinc-containing dust is the finished product material, which is collected in ton bags and transported to the finished product warehouse by car.

[0061] Third embodiment:

[0062] Based on any of the above embodiments, the processing device further includes a second silo group 8, combined with Figure 1 and Figure 2 The second silo group 8 includes a plurality of second silos, each of which is used to store dust collected from various channels;

[0063] A second discharge pipe is arranged at the bottom of the second silo, and a second valve 81 and a second weighing device 82 are arranged in sequence on the second discharge pipe in the direction away from the second silo. The second valve 81 is normally closed, and the second weighing device 82 is used to weigh the weight of the discharged dust ash; the second discharge pipe of the second silo group 8 is arranged directly above the first belt conveyor 4.

[0064] The second silo group 8 is similar to the first silo group 3, and can store dust collected from different sources, which not only increases the storage capacity and storage type, but also allows more flexible management of dust from different sources and properties. The second discharge pipe of the second silo is not provided with a humidifier 33, so that the dust in the pelletizing assembly 5 can be increased or reduced in humidity, so that the humidity of the mixed dust is within the expected range, the viscosity of the dust is improved, and the subsequent granulation is convenient.

[0065] For reference, the second silo has an underground silo, which is used to store dust dust that has fallen to the ground. Compared with the underground silo of the first silo group 3, the underground silo here is not equipped with a humidifier 33.

[0066] Fourth embodiment:

[0067] Based on any of the above embodiments, Figure 4 The screening assembly 2 includes a grabbing device 21, a slag bin 22 and a vibrating screen 24. The grabbing device 21 is used to grab the slag in the slag trough 11 and move the grabbed slag to the slag bin 22.

[0068] A feeder 23 is provided at the output end of the slag bin 22, and the output end of the feeder 23 is arranged directly above the vibrating screen 24;

[0069] The vibrating screen 24 includes a screen and a buffer bin group 25. The screen is tilted and the buffer bin group 25 is arranged directly below the screen. The buffer bin group 25 includes two buffer bins, which are respectively used to collect medium-particle kiln slag and small-particle kiln slag, and the large-particle kiln slag falls directly to the ground.

[0070] The grabbing device 21 includes a crane, which is provided with a grab bucket. The high-temperature slag in the rotary kiln 1 is washed into the car through the slag trough 11 by high-pressure water, and the cooled slag is grabbed into the slag bin 22 by the grab bucket. The slag bin 22 is used as a temporary storage point to accommodate a certain amount of slag, waiting for subsequent processing, which helps to balance the production rhythm and maintain a stable supply even when the slag generation speed fluctuates. The slag bin 22 is provided with a gate valve, and the iron slag is sent to the vibrating screen 24 through the gate valve and the vibrating feeder 23. Particles below 55 mm enter the vibrating screen 24 for screening, and particles less than 3 mm are separated separately. The screening process is drained to reduce the water spillage during the transportation of the car. After screening, large slag larger than 55 mm falls to the ground, and large particles of slag between 3 mm and 55 mm enter the buffer bin marked with (-55, +3 mm), which are transported by car to the converter as raw materials, and small particles of slag smaller than 3 mm enter the buffer bin marked with (-3 mm), which are transported by car to the sintering process.

[0071] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dust removal ash treatment device, characterized in that: It comprises a first silo group (3), a pelletizing assembly (5), a rotary kiln (1) and a screening assembly (2); The first silo group (3) comprises a plurality of first silos, each of which is used to store dust collected from various paths; a first discharge pipe is provided at the bottom of the first silo, and a first valve (31), a first weighing device (32) and a humidifier (33) are provided in sequence on the first discharge pipe in a direction away from the first silo, the first valve (31) is normally closed, the first weighing device (32) is used to weigh the discharged dust, and the humidifier (33) is used to humidify the discharged dust; a first belt conveyor (4) is provided directly below the first silo group (3), and the first belt conveyor (4) is used to convey the dust discharged from the first discharge pipe; The ball-making component (5) is arranged at the output end of the first belt conveyor (4), and is used to mix the dust-removed dust output from each first silo, and make the mixed dust-removed dust into a plurality of finished balls; the output end of the ball-making component (5) is provided with a second belt conveyor (6), and the second belt conveyor (6) is used to transport the finished balls; The input end of the rotary kiln (1) is arranged at the output end of the second belt conveyor (6), and a slag trough (11) is arranged at the output end of the rotary kiln (1); The screening component (2) is arranged beside the slag trough (11), and is used to grab the slag in the slag trough (11), screen the slag according to particle size, and obtain large-particle slag, medium-particle slag and small-particle slag.

2. A dust removal ash treatment device according to claim 1, characterized in that: The treatment device also includes a flue gas purification component (7), which includes a settling chamber (71), a main surface cooler (72) and a main dust collector (73), the input end of the settling chamber (71) is connected to the gas output end of the rotary kiln (1), the output end of the settling chamber (71) is connected to the input end of the main surface cooler (72), and the output end of the main surface cooler (72) is connected to the input end of the main dust collector (73).

3. A dust removal ash treatment device according to claim 2, characterized in that: The settling chamber (71) includes a plurality of arranged settling bins, a water tank is arranged on the top of the settling bin, and the water tank is used to cool the flue gas; a first ash hopper (74) is arranged at the bottom of the settling bin, and the first ash hopper (74) is used to store ash settled in the settling bin; a first scraper (77) is arranged below the settling chamber (71), and the first scraper (77) is used to collect ash output from the first ash hopper (74).

4. The dust removal ash treatment device according to claim 2, characterized in that: A second ash hopper (75) is provided at the bottom of the main cooler (72), and the second ash hopper (75) is used to store the ash settled in the main cooler (72); a second scraper (78) is provided below the main cooler (72), and the second scraper (78) is used to collect the ash output by the second ash hopper (75).

5. The dust removal ash treatment device according to claim 2, characterized in that: A third ash hopper (76) is provided at the bottom of the main dust collector (73), and the third ash hopper (76) is used to store the ash settled in the main dust collector (73); a third scraper (79) is provided below the main dust collector (73), and the third scraper (79) is used to collect the ash output by the third ash hopper (76).

6. The dust removal ash processing device according to claim 1, characterized in that: The processing device also includes a second silo group (8), wherein the second silo group (8) includes a plurality of second silos, each of which is used to store dust collected from various paths; A second discharge pipe is arranged at the bottom of the second silo, and a second valve (81) and a second weighing device (82) are arranged in sequence on the second discharge pipe in a direction away from the second silo, the second valve (81) is normally closed, and the second weighing device (82) is used to weigh the discharged dust ash; the second discharge pipe of the second silo group (8) is arranged directly above the first belt conveyor (4).

7. A dust removal ash treatment device according to claim 6, characterized in that: The first material bin and the second material bin are both provided with a bin wall vibrator (34).

8. The dust removal ash processing device according to claim 1, characterized in that: A dust removal bag is provided at the end of the rotary kiln (1).

9. The dust removal ash processing device according to claim 1, characterized in that: The screening assembly (2) comprises a grabbing device (21), a slag bin (22) and a vibrating screen (24), wherein the grabbing device (21) is used to grab the slag in the slag trough (11) and move the grabbed slag to the slag bin (22); A feeder (23) is provided at the output end of the slag bin (22), and the output end of the feeder (23) is arranged directly above the vibrating screen (24); The vibrating screen (24) comprises a screen and a buffer bin group (25), wherein the screen is arranged obliquely and the buffer bin group (25) is arranged The buffer bin group (25) is arranged directly below the screen, and the buffer bin group (25) comprises at least two buffer bins. The two buffer bins are used to collect medium-sized slag and small-sized slag respectively.

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