CN216738476U - System for regenerating calcium aluminate by utilizing harmless secondary aluminum ash - Google Patents
System for regenerating calcium aluminate by utilizing harmless secondary aluminum ash Download PDFInfo
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Abstract
The utility model discloses a system for regenerating calcium aluminate by utilizing harmless secondary aluminum ash, which comprises a dry-grinding aluminum extraction system, a secondary aluminum ash collecting device, a deamination system, a sorting device and a filtering device which are arranged in series, wherein the deamination system is connected with an ammonia collecting system, a liquid outlet and a solid outlet of the filtering device are respectively connected with a solidified fluorine system and a calcium aluminate production system, the calcium aluminate production system comprises a drying device, a material mixing ball mill and a rotary kiln which are sequentially connected in series, an air cooler is arranged at the head of the rotary kiln, a cyclone preheater is arranged at the tail of the rotary kiln, and the drying device, the air cooler and the cyclone preheater are connected through pipelines. The utility model can fully utilize the flue gas waste heat of the rotary kiln when drying, reduces the heat energy consumption, and because the harmless secondary aluminum ash enters the calcium aluminate production system and does not contain substances containing nitrogen, fluorine, metallic aluminum and the like in the primary aluminum ash, the production difficulty of the calcium aluminate is reduced, the quality of the calcium aluminate product is ensured, the environment is protected, and simultaneously, the good energy-saving and efficiency-reducing effects are achieved.
Description
Technical Field
The utility model belongs to the technical field of treatment and recycling of aluminum ash which is a waste resource in the aluminum industry, and particularly relates to a system for regenerating calcium aluminate by utilizing harmless secondary aluminum ash.
Background
Aluminum and aluminum alloys are one of the most economically feasible materials with a wide range of applications. The world's aluminum production has been the first of nonferrous metals since 1956 to exceed the copper production. The current production and usage of aluminum (in tons) is second only to steel, the second largest metal for human use. China is the world's largest aluminum producing and consuming country. According to statistics, about 30-50 kg of aluminum ash is generated when 1 ton of aluminum is produced and cast, in 2019, the original aluminum yield in China reaches 3504 ten thousand tons, the amount of discharged aluminum ash is about 500 ten thousand tons, and the quantity of the waste materials is remarkably saved in history. In 2020, China enters the peak period of aluminum consumption, and in 2025, China will become the main source of aluminum waste worldwide. In the face of gradual shortage of bauxite resources, gradual increase of aluminum application amount, gradual strictness of environmental protection requirements and inconspicuous aluminum recycling, the recycling of aluminum in China is not only resource saving, energy consumption reduction and environmental protection, but also is an important development direction in the future.
The method for refining the secondary aluminum by utilizing waste resources such as aluminum ash, waste aluminum materials and the like is an important supplement for the development of the aluminum industry. The aluminum ash is industrial solid waste generated in aluminum smelting and processing processes of aluminum water ingot casting, aluminum ingot remelting and the like, metal aluminum and aluminum oxide components in the aluminum ash have recycling value, and meanwhile, components containing soluble fluoride and aluminum nitride in the aluminum ash are also important points of environmental protection concern. If the aluminum ash is buried, the local soil and water resources are seriously polluted, the heavy metal poisoning of peripheral livestock, residents and plants is caused, the peripheral soil is salinized, and crops die in a large amount. The traditional disposal method is basically landfill or open-air stacking, the disposal measure not only occupies a large amount of land, but also the soluble fluoride and ammonia contained in the disposal measure can be transferred or volatilized to enter the atmosphere through the actions of wind blowing, solarization and rain, or are mixed into rivers along with rainwater and permeate into underground polluted soil and underground water, great damage is generated to the growth of animals and plants and human bodies, the ecological environment is damaged, and the agricultural ecological balance is influenced.
For a long time, a great deal of research is made on the treatment and utilization of aluminum ash by aluminum industrial enterprises and scientific research institutions, and certain achievements exist, and the existing aluminum ash treatment technology can be divided into a process for recovering metal aluminum and a process for synthesizing materials by utilizing aluminum ash.
Aiming at the process of recovering metal aluminum, a plurality of methods for recovering aluminum from aluminum ash at home and abroad are mainly classified into a heat treatment recovery method and a cold treatment recovery method, the heat treatment method mainly comprises a fried ash recovery method, a rotary kiln treatment method and the like, and the recovery rate of aluminum can reach more than 70%. The heat treatment recovery method mainly aims at primary aluminum ash, and mainly utilizes the heat of the aluminum ash, adds a plurality of additives (mainly salts), melts the metal aluminum in the aluminum ash through high-temperature stirring, and realizes the separation of the metal aluminum and the aluminum ash because the metal aluminum and the aluminum ash are not wetted and the metal aluminum sinks to the bottom due to large density. The method has the advantages of simple operation and the defects that a large amount of smoke dust is generated when the aluminum ash is stirred at high temperature, the environment is polluted, and the secondary aluminum ash treated by the method contains a large amount of soluble salt, so that the subsequent treatment is difficult and secondary pollution is easily caused. Another form of the heat treatment recycling method is to heat the aluminum ash by an external heat source (e.g., a rotary arc furnace, a plasma arc furnace, etc.) to melt the aluminum metal, thereby achieving separation of aluminum and the aluminum ash. The method has the outstanding advantages of small pollution, no soluble salt in the secondary aluminum ash after treatment, and contribution to subsequent treatment, but the method consumes a large amount of energy and has high cost. The cold treatment recovery method mainly aims at secondary aluminum ash. The aluminum ash treated by the heat treatment recovery method still contains a certain amount of metal aluminum, the cooled metal aluminum forms small particles, and the aluminum in the small particles is generally recovered by screening, gravity separation, flotation or electric separation.
The research at home and abroad is still diversified aiming at the process of synthesizing materials by using aluminum ash. The ground aluminum ash and the salt-containing deposits are typically treated by the addition of dilute acid, base, water, etc. to produce aluminum salt compounds, brine, silicon and aluminum oxides, etc. The regenerated salt extracted from brine can be used as covering agent, separating agent, etc. in production; the solid oxide can be used for producing cement, water purifying agent, polyaluminium chloride, polyaluminium sulfate and brown aluminium oxide, etc.
Patent document CN201910589589.6 discloses a method for producing calcium aluminate by using aluminum ash, which comprises the following steps: step one, mixing materials; smelting in an electric arc furnace in the second procedure, and crushing and screening in the third procedure. Although the method adopts the electric arc furnace to generate heat, on one hand, the problem that the powdery waste aluminum ash cannot be utilized due to the process environmental protection limitation in the production of the traditional furnace kiln is avoided, the requirement on the raw material of the aluminum ash is reduced, the waste aluminum ash does not need to be pretreated, on the other hand, the electrochemical reaction of the mixture can be accelerated, and the production efficiency is improved, but the smelting temperature is 1550-.
Patent document CN201910890863.3 discloses a process and a production system for producing calcium aluminate powder by using aluminum ash, wherein the process comprises the following steps: crushing and screening the aluminum ash, and uniformly mixing the aluminum ash with limestone according to a predetermined ratio to obtain a mixed raw material; performing ball milling treatment on the mixed raw materials to obtain mixed raw material powder; preheating and decomposing the mixed raw material powder to obtain a decomposed mixed raw material; sintering the decomposed mixed raw materials to obtain a sintered block; and cooling the sintered blocks, grinding and screening to obtain the calcium aluminate powder. Although the process system combines harmful substances such as fluoride and nitride in the aluminum ash with calcium ions to become harmless substances to protect the environment and produce calcium aluminate powder, the calcium aluminate powder contains substances such as calcium fluoride and calcium nitrate, and the heat is consumed due to the combination of the harmful substances such as fluoride and nitride with the calcium ions in the calcining process, so that the calcium aluminate recovery quality is limited and the energy-saving and efficiency-reducing effects are limited.
Patent document CN201910454664.8 discloses a process for producing polyaluminium chloride and calcium aluminate by using aluminium ash, which comprises the following steps: (1) frying ash, and recovering metal aluminum to obtain secondary aluminum ash; (2) carrying out deamination treatment on the secondary aluminum ash to obtain deaminated aluminum ash slurry; (3) defluorinating the deaminated aluminum ash slurry to obtain defluorinated aluminum ash slurry; (4) filtering the defluorinated aluminum ash slurry to obtain filtrate and filter residue; the filtrate is polyaluminium chloride solution; (5) washing the filter residue to be neutral, uniformly mixing the filter residue with calcium-based auxiliary materials, drying, reacting at a high temperature, and cooling, crushing and grinding the mixture after the reaction to obtain the calcium aluminate. Although the process method carries out thorough harmless treatment on the secondary aluminum ash to ensure the quality of the recovered calcium aluminate and the environmental protection requirement, the process method has a drying process and high-temperature reaction at 1350 ℃ and 1600 ℃ in an electric reaction furnace, the energy consumption is large, and the production process of the calcium aluminate is complicated due to defluorination of a curing agent and the like.
Patent document No. CN201710678051.3 discloses a method for harmless comprehensive utilization of secondary aluminum ash, which comprises the steps of adding water into secondary aluminum ash generated after aluminum ash frying treatment to prepare slurry, stirring for deamination reaction, and condensing or absorbing ammonia gas generated by the reaction by water; carrying out liquid-solid separation on the slurry after reaction, and evaporating and crystallizing the separated liquid phase to obtain a mixture of chloride and fluoride; the separated solid phase is used to produce a calcium aluminate material. Although the method can harmlessly treat the aluminum ash, efficiently recover useful components in the aluminum ash with quality guarantee and prepare the calcium aluminate product, the process is simple, but the heat energy consumption in the drying and high-temperature processes of the calcium aluminate material is larger.
Therefore, although certain results are achieved on the treatment and utilization of the aluminum ash, no harmless treatment and utilization technology which is economical, environment-friendly, energy-saving and efficiency-reducing is formed.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a system for regenerating calcium aluminate by using harmless secondary aluminum ash so as to solve the problems in the background technology.
The utility model provides a system for regenerating calcium aluminate by utilizing harmless secondary aluminum ash, which comprises the following specific steps:
the utility model provides an utilize innoxious secondary aluminium ash regeneration calcium aluminate system, dry milling including series arrangement to carry aluminium system, secondary aluminium ash collection device, deamination system, sorting unit and filter equipment, be connected with an album ammonia system behind the deamination system, filter equipment's liquid outlet is connected with solidification fluorine system, filter equipment's solid export intercommunication calcium aluminate production system, calcium aluminate production system is including drying device, compounding ball mill, the rotary kiln that establish ties in proper order and set up, the rotary kiln head is equipped with air cooler, kiln tail and is equipped with cyclone preheater, drying device, air cooler, cyclone preheater pass through the pipe connection.
By adopting the technical scheme, the primary aluminum ash sequentially passes through the dry grinding aluminum extraction system, the secondary aluminum ash collecting device, the deamination system, the sorting device and the filtering device to obtain the deamination defluorination high-aluminum filter cake (high-aluminum material) and deamination filtrate. The deamination defluorination high-alumina filter cake can be conveyed into a drying device through a belt for drying; feeding the dried high-alumina material and the lime powder into a mixing ball mill by a pipeline chain machine in proportion to perform mixing and grinding; the ground mixture is preheated to 800 ℃ by a cyclone preheater arranged at the tail of a rotary kiln, aluminum hydroxide is converted into gamma-type aluminum oxide, and limestone is decomposed into carbon dioxide and calcium oxide to obtain a preheated material; the preheated material enters a rotary kiln body to be calcined at high temperature, and aluminum oxide and calcium oxide are subjected to chemical reaction at the high temperature of 1200-1300 ℃ to obtain calcium aluminate clinker; and finally cooling the calcium aluminate clinker by an air cooler to obtain a calcium aluminate product. Simultaneously, the deamination filtrate carries soluble fluorine substances contained in the deamination filtrate to solidify the soluble fluorine substances through a fluorine solidification system, and an ammonia collection system collects separated ammonia, and in addition, the dry-grinding aluminum extraction system and the sorting device also screen and obtain metal aluminum. Therefore, the system provided by the utility model utilizes harmless secondary aluminum ash to produce and recover high-quality calcium aluminate products in an energy-saving manner, and creates a great condition for fully utilizing other subsequent recovered products. Because dry milling carries the aluminium system, secondary aluminium ash collection device, deamination system, material such as nitrogenous substance in the aluminium ash can be got rid of in sorting unit and filter equipment's setting, fluoric substance and metallic aluminum, make what get into calcium aluminate production system be innoxious secondary aluminium ash, the production degree of difficulty that has reduced calcium aluminate has guaranteed the quality of calcium aluminate product, and avoided the combination of nitrogenous substance and fluoric substance and calcium to the consumption and the heat energy loss of calcium at the heating process, the consumption to heat energy when having avoided metallic aluminum to melt simultaneously, reach fine energy-conservation when the environmental protection and reduced the effect. Particularly, the drying device, the air cooler and the cyclone preheater are connected through pipelines, so that the waste heat of the flue gas of the rotary kiln can be fully utilized during drying, and the heat energy consumption is reduced. Specifically, when the waste heat of the flue gas is utilized, the gas after heat exchange of the kiln head air cooler is mixed with hot air of the kiln tail cyclone preheater, dust and mixed hot air are firstly separated through cyclone, the mixed hot air then enters the dryer to exchange heat with the deamination defluorination high-alumina filter cake, and finally the gas after heat exchange is discharged after reaching the standard after the dust is collected by the bag-type dust remover.
In addition, the harmless treatment and acquisition process of the harmless secondary aluminum ash is specifically as follows, the primary aluminum ash firstly enters a dry-grinding aluminum extraction system to separate and extract a metal aluminum sheet and the secondary aluminum ash. Preferably, the dry-milling aluminum extraction system comprises a ball mill with a drum screen, primary aluminum ash enters the ball mill, the primary aluminum ash is ground by the ball mill, so that metal aluminum with good ductility in the primary aluminum ash is extruded into a flat shape, other non-metal parts are crushed by impact, and finally separated metal aluminum sheets and secondary aluminum ash are obtained by screening through the drum screen; the secondary aluminum ash is collected into a secondary aluminum ash collecting device, when the secondary aluminum ash is subjected to harmless treatment and recovery, the secondary aluminum ash in the secondary aluminum ash collecting device is conveyed into a slurry melting tank of a deamination system through a metering screw machine, is heated and stirred, aluminum nitride in the secondary aluminum ash collecting device fully reacts with water under proper process conditions, ammonia gas is released and simultaneously generates deamination slurry, the ammonia gas is collected to an ammonia collecting system through an induced draft fan, the deamination slurry is conveyed to a sorting device, and a metal aluminum sheet and deamination high-aluminum slurry are obtained through separation through the sorting device; conveying the deamination high-aluminum slurry to a filtering device, and filtering and separating the deamination high-aluminum slurry by the filtering device to obtain a deamination defluorination high-aluminum filter cake (high-aluminum material, namely harmless secondary aluminum ash) and deamination filtrate; the deaminated filtrate is delivered to a solidified fluorine system to eventually fix the fluorine to avoid destroying the ecological environment by soluble fluorides. So far, the process is the harmless treatment and acquisition process of the harmless secondary aluminum ash. According to the process, firstly, the first extraction of the metal aluminum is carried out on a dry-grinding aluminum extraction system in a dry-grinding mode, so that the metal aluminum is separated from the secondary aluminum ash, the recovery of the metal aluminum is obtained, the difficulty of subsequent harmless treatment of the secondary aluminum ash is reduced, the heat energy consumption of aluminum extraction in a heat treatment mode is avoided, and the energy conservation and the efficiency reduction are realized; in follow-up secondary aluminium ash innocent treatment process, the mode aluminium nitride that releases the ammonia through the reaction of water logging deamination and water and the mode that the draught fan in time shifted and collect the ammonia carries out aluminium nitride conversion deamination and removes the harm processing, the quick production of ammonia leads to the atmospheric pressure increase in having both avoided catalyst deamination reaction, the factor of safety has been promoted to the explosion risk has been reduced, also carried out high-efficient quick collection so that recycle to the ammonia, avoid directly releasing polluted environment, the thick liquids after still carrying out the collection of secondary metallic aluminum through sorting unit's setting to the deamination, not only realize metallic aluminum's maximize and draw, the fixed utilization of the high-alumina charge who has beneficial composition in the follow-up discarded object of still being convenient for and harmful ingredient soluble fluoride.
Preferably, the ball mill is a two-stage ball mill. The arrangement of the second-stage ball mill enables the first-stage aluminum ash to undergo two-stage ball milling and two-stage screening. Specifically, primary aluminum ash enters a first-stage ball mill through belt conveying, the ball-milled material is subjected to first screening, the screening material larger than 1mm is screened out as a metallic aluminum sheet, the powder smaller than 120 meshes is conveyed to a secondary aluminum ash collecting device through a belt, the material between 120 meshes and 1mm is conveyed into a second-stage ball mill through a belt, the ball-milled material is subjected to second screening, the screening material larger than 100 meshes is screened out as a metallic aluminum sheet, and the powder smaller than 100 meshes is conveyed to a secondary aluminum ash collecting device through a belt.
Preferably, the ammonia collection system further comprises a spray tower.
Preferably, the fluorine curing system comprises a fluorine curing reaction kettle.
Preferably, the drying device is a flash evaporation machine, and the mesh number of the lime powder is 80-120 meshes.
Further, a denitration device is connected to an air outlet of the cyclone preheater.
By adopting the technical scheme, through the arrangement of the denitration device, nitrogen-containing substances in the flue gas are removed, and the influence on the recovery rate and the recovery quality of the high-aluminum material caused by the reaction of the nitrogen-containing substances with the deamination defluorination high-aluminum filter cake in the drying device along with the flue gas is avoided.
Further, the denitration device is connected with the ammonia collecting system through a pipeline.
By adopting the technical scheme, the ammonia absorption device in the denitration device and the ammonia collecting system is connected, the ammonia water generated by the ammonia absorption device can be used for removing nitrogen-containing substances in the flue gas, and the energy conservation and efficiency reduction are realized.
Furthermore, a new washing water pipeline is communicated with the filtering device.
By adopting the technical scheme, the deamination defluorination high-alumina filter cake can be washed on line by the arrangement of the washing new water pipeline, so that the soluble fluoride contained in the deamination defluorination high-alumina filter cake (high-alumina material) can be further removed, and the removal of the soluble fluoride is ensured to be clean.
Further, the air cooler is also connected with an air cooler.
Furthermore, a grinding device is connected behind the air cooler.
By adopting the technical scheme, the cooled clinker enters the grinding device through the arrangement of the grinding device, and a calcium aluminate powder product is obtained. Preferably, the grinding device is a Raymond mill.
Furthermore, a wind classifier is installed on the grinding device.
By adopting the technical scheme, the powder with qualified granularity is discharged through the arrangement of the air classifier.
Furthermore, the outlet of the grinding device is communicated with an automatic packaging machine.
By adopting the technical scheme, the powder with qualified granularity is directly packaged after being discharged through the arrangement of the automatic packaging machine, and can be packaged into 25 kg/bag of products according to the requirement.
Furthermore, a scattering machine is arranged in front of the drying device, and a dry powder collecting device is arranged behind the drying device.
Adopt above-mentioned technical scheme, through the setting of the machine of breaing up, the deamination defluorination high alumina filter cake that obtains filter equipment filtering separation is broken up and is the wet powder of high alumina charge, and area of contact when being convenient for increase is dried improves drying efficiency, energy-conservation efficiency of falling. Through the setting of dry powder material collection device, can collect the storage to dry high-alumina material to the flexible processing of follow-up.
Furthermore, a spiral constant feeder is arranged behind the scattering machine and in front of the drying device.
By adopting the technical scheme, through the arrangement of the spiral constant feeder, the scattered high-aluminum materials are stably, uniformly and quantitatively conveyed to the drying device, so that the environment pollution caused by dust is avoided, the loss of the high-aluminum materials is also avoided, and the recovery of the high-aluminum materials is ensured.
Further, the device also comprises a bag dust collector for collecting dust generated in the processes of feeding, ball milling, screening and transferring.
By adopting the technical scheme, the arrangement of the cloth bag dust collector ensures that the aluminum ash is purified in the process of treatment and utilization, and avoids environmental pollution. Preferably, the collected dust in the bag type dust collector is conveyed to the secondary aluminum ash collecting device through a screw elevator.
The utility model has the following beneficial effects:
1. the system of the utility model utilizes harmless secondary aluminum ash to produce and recover high-quality calcium aluminate products in an energy-saving manner, and creates great conditions for fully utilizing other subsequent recovered products. The calcium aluminate production system is filled with harmless secondary aluminum ash, and does not contain substances such as nitrogen-containing substances, fluorine-containing substances, metal aluminum and the like in the primary aluminum ash, so that the production difficulty of the calcium aluminate is reduced, the quality of the calcium aluminate product is ensured, the consumption of the combination of the nitrogen-containing substances, the fluorine-containing substances and the calcium and the heat energy loss are avoided in the heating process, the consumption of the heat energy when the metal aluminum is melted is avoided, the environment is protected, and the good energy-saving and efficiency-reducing effects are achieved. Particularly, the drying device, the air cooler and the cyclone preheater are connected through pipelines, so that the waste heat of the flue gas of the rotary kiln can be fully utilized during drying, and the heat energy consumption is reduced.
2. According to the utility model, by arranging the denitration device, nitrogen-containing substances in the flue gas during flue gas waste heat utilization are removed, and the nitrogen-containing substances are prevented from entering the drying device along with the flue gas to react with the deamination defluorination high-alumina filter cake, so that the recovery rate and the recovery quality of the high-alumina material are influenced. And further through the setting that denitrification facility and ammonia gas absorbing device are connected, the nitrogenous material in the flue gas is detached to the aqueous ammonia that usable ammonia gas absorbing device produced, and is energy-conserving to fall and imitate.
3. According to the utility model, the deaminizing defluorination high-aluminum filter cake is scattered into high-aluminum wet powder through the arrangement of the scattering machine, so that the contact area during drying is increased, the drying efficiency is improved, and the energy and efficiency are saved. And further through the setting of spiral constant feeder, the high-alumina material that will break up is stable, even, quantitative transport to drying device in, both avoided the raise dust polluted environment, also avoided the loss of high-alumina material, ensured the recovery of high-alumina material.
Drawings
FIG. 1 is a schematic flow chart of a system for regenerating calcium aluminate by using harmless secondary aluminum ash according to the present invention.
In the figure: 1. a dry milling aluminum extraction system; 2. a secondary aluminum ash collecting device; 3. a deamination system; 4. an ammonia collection system; 5. a sorting device; 6. a filtration device; 7. curing the fluorine system; 8. a calcium aluminate production system; 801. a drying device; 802. a mixing ball mill; 803. a rotary kiln; 804. an air cooler; 805. a cyclone preheater; 806. a denitration device; 807. an air cooler; 808. a grinding device; 809. a wind classifier; 810. an automatic packaging machine; 811. a breaker; 812. a dry powder collection device; 813. a spiral constant feeder; 9. washing the new water pipeline; 10. a bag-type dust collector.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example 1
The utility model provides an utilize innoxious secondary aluminium ash regeneration calcium aluminate system, as shown in figure 1, carry aluminium system 1 including the dry grinding that the series connection set up, secondary aluminium ash collection device 2, deamination system 3, sorting unit 5 and filter equipment 6, deamination system 3 back is connected with album ammonia system 4, filter equipment 6's liquid outlet is connected with solidification fluorine system 7, filter equipment 6's solid export intercommunication calcium aluminate production system 8, calcium aluminate production system 8 is including the drying device 801 that sets up in proper order in series, compounding ball mill 802, rotary kiln 803, the rotary kiln 803 kiln head is equipped with air cooler 804, the kiln tail is equipped with cyclone 805, drying device 801, air cooler 804, cyclone 805 passes through the pipe connection. Preferably, the drying device 801 is a flash evaporation machine.
As shown in fig. 1, the filtering device 6 is connected to a fresh washing water pipe 9. Through the arrangement of the washing new water pipeline 9, the deamination high-alumina filter cake high-alumina material can be washed on line so as to further remove soluble fluoride contained in the deamination high-alumina filter cake high-alumina material.
Specifically, as shown in fig. 1, a denitration device 806 is connected to an air outlet of the cyclone preheater 805, and the denitration device 806 is further connected to the ammonia collection system 4 through a pipeline. Through the setting of denitrification facility 806, detach the nitrogenous substance in the flue gas, avoid the nitrogenous substance to get into the reaction of drying device with the high-alumina material of deamination high alumina filter cake along with the flue gas, influence the rate of recovery and the recovery quality of high-alumina material, through the setting that denitrification facility 806 is connected with the ammonia absorbing device 404 among the ammonia collection system 4, the nitrogenous substance in the flue gas is detached to the aqueous ammonia that usable ammonia absorbing device 404 produced, and is energy-conserving to fall imitate.
Specifically, as shown in fig. 1, the air cooler 804 is further connected to an air cooler 807, the air cooler 804 is further connected to a mill 808, and the mill 808 is provided with an air classifier 809. The outlet of the grinding device 808 is communicated with an automatic packaging machine 810. Through the arrangement of the grinding device 808, the cooled clinker enters the grinding device 808, and a calcium aluminate powder product is obtained. Preferably, the grinding device 808 is a Raymond mill. The air classifier 809 is used to discharge the qualified powder. The powder with qualified granularity is directly packaged after being discharged through the arrangement of the automatic packaging machine 810, and can be packaged into 25 kg/bag of products as required.
Specifically, as shown in fig. 1, a scattering machine 811 is disposed in front of the drying apparatus 801, and a dry powder collecting apparatus 812 is disposed behind the drying apparatus 801. A screw quantitative feeder 813 is arranged behind the scattering machine 811 and in front of the drying device 801. Through the setting of machine 811 of breaing up, break up the deamination high alumina filter cake that 6 filtering separation of filter equipment obtained into high-alumina material, area of contact when being convenient for increase is dried improves drying efficiency, energy-conservation falls the effect. Through the arrangement of the dry powder material collecting device 812, dry high-alumina materials can be collected and stored for subsequent flexible treatment. Through the setting of screw constant feeder 813, the high-alumina material that will break up is stable, even, quantitative carry to drying device 801 in, both avoided the raise dust polluted environment, also avoided the loss of high-alumina material, ensured the recovery of high-alumina material.
Specifically, as shown in fig. 1, the dust collector comprises a bag collector 10 for collecting dust generated in the processes of feeding, ball milling, screening and transferring. The arrangement of the bag type dust collector 10 ensures the purification of gas in the process of treating and utilizing aluminum ash, and avoids environmental pollution. Preferably, the dust collecting material in the bag dust collector 10 is conveyed to the secondary aluminum ash collecting device 2 through a screw and a lifter.
The working principle of the system for regenerating calcium aluminate by utilizing harmless secondary aluminum ash is as follows:
firstly, obtaining secondary aluminum ash specifically as follows:
firstly, the primary aluminum ash enters a dry-milling aluminum extraction system 1 to separate and extract a metal aluminum sheet and secondary aluminum ash;
secondly, collecting the secondary aluminum ash into a secondary aluminum ash collecting device 2;
secondly, carrying out innocent treatment on the secondary aluminum ash specifically as follows:
thirdly, the secondary aluminum ash in the secondary aluminum ash collecting device 2 is sent to a deamination system 3 through a metering screw machine, aluminum nitride in the secondary aluminum ash collecting device fully reacts with water under proper process conditions, ammonia gas is released and simultaneously deamination slurry is generated, the ammonia gas is collected to an ammonia collecting system 4 and is absorbed by the water to generate ammonia water, and the deamination slurry is conveyed to a sorting device 5;
fourthly, separating the deamination slurry by a sorting device 5 to obtain an aluminum sheet metal and deamination high-aluminum slurry;
fifthly, pumping the deamination high-alumina slurry to a filtering device 6, conveying washing new water through a washing new water pipeline 9 in the filtering device 6 to realize online washing, filtering and separating to obtain a deamination defluorination high-alumina filter cake (high-alumina material) and deamination filtrate, pumping the deamination filtrate to a solidified fluorine system 7 to finally fix fluorine to prevent soluble fluoride from destroying the ecological environment, and conveying the deamination high-alumina filter cake high-alumina material to a calcium aluminate production system 8 through a belt;
and finally, recycling the harmless secondary aluminum ash to produce calcium aluminate, which specifically comprises the following steps:
sixthly, the high-aluminum material of the deamination high-aluminum filter cake is scattered into high-aluminum material wet powder by a scattering machine 811;
seventhly, conveying the high-aluminum wet powder into a drying device 801 stably, uniformly and quantitatively through a spiral quantitative feeder 813;
eighthly, drying the wet high-aluminum material powder in a drying device 801 by using the waste heat of the flue gas to obtain dry high-aluminum material powder; when the waste heat of the flue gas is utilized, the gas subjected to heat exchange by the kiln head air cooler 804 is mixed with hot air of the kiln tail cyclone preheater 805, dust and mixed hot gas are separated by cyclone, the mixed hot gas enters the denitration device 806 and is subjected to denitration treatment by mixing with ammonia water to obtain denitration hot gas, the denitration hot gas enters the dryer 801 and exchanges heat with wet high-aluminum material powder, and finally the gas subjected to heat exchange is discharged after dust is collected by the bag-type dust collector and reaches the standard;
ninth, the high-aluminum dry powder is collected and stored by the dry powder collecting device 812 for subsequent flexible treatment;
step ten, proportionally feeding the high-alumina dry powder and lime powder (preferably, the mesh number of the lime powder is 80-120 meshes) in the dry powder collecting device 812 into the mixing ball mill 802 through a pipe chain machine for mixing and grinding;
step ten, the ground mixture is preheated to 800 ℃ through a cyclone preheater 805 arranged at the tail of a rotary kiln 803, aluminum hydroxide is converted into gamma-type aluminum oxide, and limestone is decomposed into carbon dioxide and calcium oxide to obtain a preheated material;
the twelfth step, the preheated material enters the kiln body of the rotary kiln 803 to be calcined at high temperature, and the aluminum oxide and the calcium oxide are subjected to chemical reaction at the high temperature of 1200-1300 ℃ to obtain the calcium aluminate clinker;
thirteenth step, cooling the calcium aluminate clinker by an air cooler 804 to obtain a calcium aluminate product;
so far, the harmless secondary aluminum ash is recycled to produce high-quality calcium aluminate products, and the embodiment can further grind and subpackage the calcium aluminate products, which is as follows:
fourteenth, grinding the calcium aluminate product by a grinding device 808 to obtain calcium aluminate powder, and screening the calcium aluminate powder with qualified particle size by a separation classifier 809;
and fifteenth, bagging the calcium aluminate powder with qualified particle size by an automatic packaging machine 810 to obtain a bagged calcium aluminate powder product.
The system of the embodiment utilizes harmless secondary aluminum ash to produce and recover high-quality calcium aluminate products in an energy-saving manner, and creates great conditions for fully utilizing other subsequent recovered products. The calcium aluminate production system is formed by the steps of mixing the primary aluminum ash with the nitrogen-containing substance, the fluorine-containing substance and the metal aluminum, heating the mixture to obtain the calcium aluminate product, and then adding the calcium aluminate product into a furnace to obtain the calcium aluminate product. It is particularly noted that the drying device 801, the air cooler 804 and the cyclone preheater 805 are connected by pipelines, so that the flue gas waste heat of the rotary kiln can be fully utilized during drying, and the heat energy consumption is reduced. In addition, in the process of obtaining harmless secondary aluminum ash, firstly, the primary extraction of metal aluminum is carried out on the dry-grinding aluminum extraction system 1 in a dry-grinding mode, so that the metal aluminum is separated from the secondary aluminum ash, the recovery of the metal aluminum is obtained, the difficulty of the subsequent harmless treatment of the secondary aluminum ash is reduced, the heat energy consumption of aluminum extraction in a heat treatment mode is also avoided, and the energy conservation and the efficiency reduction are realized.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A system for regenerating calcium aluminate by utilizing harmless secondary aluminum ash, which comprises a dry-grinding aluminum extraction system (1), a secondary aluminum ash collecting device (2), a deamination system (3), a sorting device (5) and a filtering device (6) which are arranged in series, an ammonia collecting system (4) is connected behind the deamination system (3), a liquid outlet of the filtering device (6) is connected with a solidified fluorine system (7), characterized in that a solid outlet of the filtering device (6) is communicated with a calcium aluminate production system (8), the calcium aluminate production system (8) comprises a drying device (801), a mixing ball mill (802) and a rotary kiln (803) which are sequentially connected in series, the kiln head of the rotary kiln (803) is provided with an air cooler (804), the kiln tail is provided with a cyclone preheater (805), the drying device (801), the air cooler (804) and the cyclone preheater (805) are connected through pipelines.
2. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 1, wherein a denitration device (806) is connected to an air outlet of the cyclone preheater (805).
3. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 2, wherein the denitration device (806) is connected with the ammonia collection system (4) through a pipeline.
4. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 1, wherein the filtering device (6) is communicated with a washing new water pipeline (9).
5. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 1, wherein an air cooler (807) is further connected to the air cooler (804).
6. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 1, wherein a grinding device (808) is connected after the air cooler (804).
7. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 6, wherein the pulverizer (808) is provided with a wind classifier (809).
8. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 6, wherein the outlet of the pulverizing device (808) is communicated with an automatic packaging machine (810).
9. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 1, wherein a scattering machine (811) is arranged in front of the drying device (801), and a dry powder collecting device (812) is arranged behind the drying device (801).
10. The system for regenerating calcium aluminate by using harmless secondary aluminum ash as claimed in claim 9, wherein a screw quantitative feeder (813) is arranged behind the scattering machine (811) and in front of the drying device (801).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116177910A (en) * | 2022-09-27 | 2023-05-30 | 洛阳理工学院 | Novel suspension preheating calcination method for industrial secondary aluminum ash |
| CN117516156A (en) * | 2024-01-08 | 2024-02-06 | 屯留县兴旺彬烨钙合金工贸有限公司 | High-temperature melting device for producing metal calcium |
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2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116177910A (en) * | 2022-09-27 | 2023-05-30 | 洛阳理工学院 | Novel suspension preheating calcination method for industrial secondary aluminum ash |
| CN117516156A (en) * | 2024-01-08 | 2024-02-06 | 屯留县兴旺彬烨钙合金工贸有限公司 | High-temperature melting device for producing metal calcium |
| CN117516156B (en) * | 2024-01-08 | 2024-03-26 | 屯留县兴旺彬烨钙合金工贸有限公司 | High-temperature melting device for producing metal calcium |
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