Aluminum ash treatment system

Abstract

The invention discloses an aluminum ash treatment system. The system comprises an aluminum ash pretreatment unit and a resource recycling unit. The aluminum ash pretreatment unit comprises an aluminum ash bin, a crusher, a ball mill, a first screening mechanism and an aluminum melting furnace which are sequentially connected in series. The resource recycling unit comprises an aluminum ash bin, a slag aluminum catalytic separation mechanism, a second screening mechanism, a reaction mechanism, a flocculating settling mechanism and a filtering and drying mechanism which are sequentially connected in series. According to the method, the dry pretreatment unit and the wet recycling unit are combined, so that the recycling effect and efficiency of aluminum resources in the aluminum ash are improved, meanwhile, the discharge of secondary pollutants is greatly reduced and even avoided, and the efficient and green recycling of the aluminum ash is realized. The device has the advantages of good quality of recovered products, high strength, high economic benefit, simple system structure, easiness in operation, environment friendliness, low operation cost and the like.

Description

Technical Field

[0001] The invention relates to aluminum ash slag processing equipment, in particular to an aluminum ash slag processing system, and belongs to the technical field of aluminum ash slag resource processing. Background Art

[0002] my country's aluminum smelting and processing industry is huge. In 2019, the output of primary aluminum was 35 million tons, the output of aluminum processed products was 41 million tons, and the output of recycled aluminum was 6 million tons. The aluminum industry is a typical high-energy consumption and high-pollution industry. A large amount of solid waste, especially hazardous waste, is generated during the production and processing process, which is an obstacle to the green development of the aluminum industry. Aluminum ash slag is a solid waste generated during the process of primary aluminum smelting, aluminum alloy processing, and aluminum recycling. Aluminum ash slag contains more aluminum, alumina, and chloride salts, and also contains a small amount of fluoride, silicon and other heavy metals. In addition, due to the different origins of the original ore, the composition of the aluminum ash slag obtained after smelting using the same process fluctuates greatly. In addition, during the high-temperature smelting process, liquid aluminum reacts with nitrogen in the air to form aluminum nitride. The fine aluminum nitride is black. After cooling, the aluminum nitride (AlN) in the aluminum ash easily reacts with water in the air to produce ammonia. Therefore, the aluminum ash slag has a foul odor and is in the form of black powder. It is mixed with a large number of large particles of metal aluminum flakes (grains) and salts, and may contain trace amounts of Al4C3 and Al2S3.

[0003] Fluoride, heavy metals and other toxic substances contained in aluminum ash are also highly harmful to the environment. If not properly handled, they will cause soil, groundwater and air pollution. Fluoride pollution can affect plant photosynthesis and respiration, and damage human bones, teeth and central nervous system.

[0004] At present, most of the aluminum ash slag treatment is to build storage yards, which not only wastes land resources but also causes environmental pollution. Therefore, it is necessary to develop more efficient aluminum ash slag treatment technology. Summary of the invention

[0005] In view of the problems in the prior art of aluminum ash slag treatment technology, such as serious waste of land resources, unsatisfactory removal of fluorides and heavy metals leading to environmental pollution, the present invention provides an aluminum ash slag treatment system, which greatly improves the recovery effect and efficiency of aluminum resources in aluminum ash slag by combining a dry pretreatment unit with a wet resource recovery unit, and also greatly reduces or even avoids the discharge of secondary pollutants. The system has a simple structure, is easy to operate, has high efficiency in aluminum ash slag resource treatment, and the obtained product recovery rate is of high quality and excellent.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0007] An aluminum ash slag processing system, the system includes an aluminum ash slag pretreatment unit and a resource recovery unit. The aluminum ash slag pretreatment unit includes an aluminum ash slag bin, a crusher, a ball mill, a first screening mechanism and an aluminum melting furnace arranged in series. The resource recovery unit includes an aluminum ash bin, a slag aluminum catalytic separation mechanism, a second screening mechanism, a reaction mechanism, a flocculation sedimentation mechanism and a filtering and drying mechanism arranged in series. Among them, the upper screen discharge port of the first screening mechanism is connected to the feed port of the aluminum melting furnace through the first feeding mechanism, and the lower screen discharge port of the first screening mechanism is connected to the feed port of the aluminum ash bin through the second feeding mechanism. The upper screen discharge port of the second screening mechanism is connected to the feed port of the aluminum melting furnace through the third feeding mechanism, and the lower screen discharge port of the second screening mechanism is connected to the feed port of the reaction mechanism through the fourth feeding mechanism.

[0008] Preferably, the first screening mechanism comprises a vibrating screen and a drum screen connected in series. The upper discharge port of the vibrating screen is connected to the feed port of the aluminum melting furnace through the first feeding mechanism, and the lower discharge port of the vibrating screen is connected to the feed port of the drum screen through the fifth feeding mechanism. The upper discharge port of the drum screen is connected to the feed port of the aluminum melting furnace through the sixth feeding mechanism, and the lower discharge port of the drum screen is connected to the feed port of the aluminum ash bin through the second feeding mechanism.

[0009] Preferably, the mesh size of the vibrating screen is 5-10 mm, and the mesh size of the drum screen is 1-3 mm.

[0010] Preferably, the aluminum ash slag pretreatment unit also includes a dry belt dust collector and an aluminum molten dust removal device. The air inlet of the dry belt dust collector is independently connected to the feed end and / or discharge end of the aluminum ash slag bin, the feed end and / or discharge end of the crusher, the feed end and / or discharge end of the ball mill, the feed end and / or discharge end of the vibrating screen, the feed end and / or discharge end of the drum screen, and the feed end and / or discharge end of the aluminum ash bin through multiple dust suction pipes and multiple dust suction hoods. The air inlet of the aluminum molten dust removal device is connected to the exhaust port of the aluminum molten furnace through a dust suction pipe and a dust suction hood. The exhaust port of the dry belt dust collector and the exhaust port of the aluminum molten dust removal device are both connected to the chimney through an exhaust pipe.

[0011] Preferably, the aluminum ash slag bin and the outlet of the aluminum ash bin are both provided with a vibration anti-blocking device. A vibrating feeder is also provided between the outlet of the aluminum ash slag bin and the feed port of the crusher. A quantitative feeder is also provided between the outlet of the aluminum ash bin and the feed port of the aluminum slag catalytic separation mechanism.

[0012] Preferably, the system further comprises an ingot casting device. The feed port of the ingot casting device is connected to the molten liquid outlet of the aluminum melting furnace through an aluminum liquid conveying mechanism. A stacking robot is also arranged at the discharge end of the ingot casting device.

[0013] Preferably, the slag aluminum catalytic separation mechanism includes a separator and a catalyst stirring tank. The discharge port of the catalyst stirring tank is connected to the feed port of the separator through a catalyst feeding pipe and a catalyst feeding pump. The feed port of the separator is also connected to the discharge port of the aluminum ash bin through the seventh feeding mechanism. The discharge port of the separator is connected to the feed port of the second screening mechanism through the eighth feeding mechanism. Preferably, a screw feeder is also provided between the separator and the seventh feeding mechanism.

[0014] Preferably, the slag-aluminum catalytic separation mechanism comprises a plurality of catalyst stirring tanks, and each catalyst stirring tank is connected to the feed port of the separator via an independent catalyst feeding pipe and a catalyst feeding pump.

[0015] Preferably, the second screening mechanism is a high-frequency vibrating screen, and the screen hole diameter of the second screening mechanism is 1.5-5 mm.

[0016] Preferably, a high-frequency screen feeding device is provided between the second screening mechanism and the eighth feeding mechanism, and the discharge port of the high-frequency screen feeding device is connected to the feed port of the second screening mechanism through a high-frequency screen feeding pipe and a high-frequency screen feeding pump.

[0017] Preferably, the reaction mechanism comprises an enhanced reaction stirring tank, an oxidation stirring tank and a carbon dioxide regulating tank which are sequentially arranged in series. An ozone adding device is arranged on the oxidation stirring tank. A carbon dioxide adding device is arranged on the carbon dioxide regulating tank. Preferably, the reaction mechanism comprises a plurality of enhanced reaction stirring tanks which are sequentially connected in series.

[0018] Preferably, a circulating feed port and a circulating discharge port are also provided on the enhanced reaction stirring tank, and the circulating discharge port of the enhanced reaction stirring tank is connected to the circulating discharge port of the enhanced reaction stirring tank through an enhanced reaction circulation pump mechanism.

[0019] Preferably, a circulating feed inlet and a circulating discharge port are also provided on the oxidation stirring tank, and the circulating discharge port of the oxidation stirring tank is connected to the circulating discharge port of the oxidation stirring tank through an oxidation stirring circulation pump mechanism.

[0020] Preferably, a circulating feed port and a circulating discharge port are also provided on the carbon dioxide regulating tank, and the circulating discharge port of the carbon dioxide regulating tank is connected to the circulating discharge port of the carbon dioxide regulating tank through a carbon dioxide regulating circulating pump mechanism.

[0021] Preferably, the flocculation and sedimentation mechanism includes a sedimentation tank and a flocculant stirring tank. The feed port of the sedimentation tank is connected to the feed port of the carbon dioxide adjustment tank through the ninth feeding mechanism. The discharge port of the sedimentation tank is connected to the feed port of the filtration and drying mechanism through the tenth feeding mechanism. The discharge port of the flocculant stirring tank is connected to the feed port of the sedimentation tank through a flocculant feeding pipe and a flocculant feeding pump. Preferably, a sedimentation feeding pump is also provided on the ninth feeding mechanism.

[0022] Preferably, the flocculation and sedimentation mechanism comprises a plurality of flocculant stirring tanks, and each flocculant stirring tank is connected to a feed port of the sedimentation tank via an independent flocculant feeding pipe and a flocculant feeding pump.

[0023] Preferably, the system further comprises an inert gas protection unit, which comprises an air compressor, a gas storage tank and an inert gas preparation device connected in series in sequence. The exhaust port of the inert gas preparation device is independently connected to the air inlet of the separator, the air inlet of the second screening mechanism, the air inlet of the high-frequency screen feeding device, the air inlet of the enhanced reaction stirring tank, the air inlet of the oxidation stirring tank, the air inlet of the carbon dioxide adjustment tank and the air inlet of the sedimentation tank through a gas pipeline.

[0024] Preferably, the system also includes an ammonia recovery unit, the air inlet of the ammonia recovery unit is independently connected to the exhaust port of the separator, the exhaust port of the second screening mechanism, the exhaust port of the high-frequency screen feeding device, the exhaust port of the enhanced reaction stirring tank, the exhaust port of the oxidation stirring tank, the exhaust port of the carbon dioxide adjustment tank, and the exhaust port of the sedimentation tank through the gas pipe cover.

[0025] Preferably, the filtering and drying mechanism comprises a belt filter, a drying machine, a bucket elevator and a storage bin connected in series. The water inlet of the belt filter is connected to the clean water pump through an inlet pipe, and the water outlet of the belt filter is connected to the concentrated brine pool through a drain pipe. Preferably, a circulating water pool is also provided on one side of the concentrated brine pool, and the concentrated brine pool and the circulating water pool are connected through a filter membrane. The circulating water pool is independently connected to the water inlet of the belt filter, the water inlet of the flocculant stirring tank, the water inlet of the second screening mechanism, and the water inlet of the catalyst stirring tank through a circulating water pump and a plurality of circulating water pipes.

[0026] Preferably, the system also includes a wet belt dust collector, the air inlet of the wet belt dust collector is independently connected to the discharge end of the dryer and the discharge end of the storage bin through multiple dust suction pipes and multiple dust suction hoods, and the exhaust port of the wet belt dust collector is connected to the chimney through an exhaust pipe.

[0027] In the present invention, the method for treating aluminum ash slag using the aluminum ash slag treatment system is specifically as follows:

[0028] 1) In the resource recovery unit, the aluminum ash slag is crushed and ground in turn by a crusher and a ball mill, and then screened by a first screening mechanism to obtain coarse aluminum ash slag and fine aluminum ash slag.

[0029] 2) The crude aluminum ash is transported to an aluminum melting furnace for heating and melting into a molten liquid, and after removing the scum from the molten liquid, it is sent to an ingot casting device for cooling and ingot casting to obtain an aluminum ingot. At the same time, the collected scum can be returned to the aluminum ash in step 1).

[0030] 3) Under the condition of inert atmosphere protection, the fine aluminum ash is transported to the slag aluminum catalytic separation mechanism, and the fluorine-fixing agent and the catalyst are added to the fine aluminum ash to mix to obtain a mixture, and the mixture is transported to the second screening mechanism for screening to obtain a coarse mixture and a fine mixture. The coarse mixture is also sent to the aluminum melting furnace for melting treatment; the fine mixture is processed in the next step.

[0031] 4) Under the condition of inert atmosphere protection, the fine mixed material is transported to the reaction mechanism for enhanced mixing treatment, oxidation treatment and sulfur fixation reaction, and sulfur fixation material is obtained after the reaction is completed.

[0032] 5) Under the condition of inert atmosphere protection, the solid sulfur material is transported to the flocculation and sedimentation mechanism and a flocculant and water are added to mix for sedimentation treatment to obtain sedimentation residue and sedimentation liquid. The sedimentation residue is transported to the filtering and drying mechanism for filtering and drying treatment and then used as the concrete raw material, and the sedimentation liquid is processed in the next step.

[0033] 6) The sedimentation liquid is transported to a concentrated brine pool for concentration and / or membrane filtration, wherein the membrane filtration produces concentrated brine and clean water, the pH of the concentrated liquid and / or concentrated brine is adjusted to perform aluminum precipitation reaction, and after the precipitation is completed, it is filtered, and the filter residue is dried to obtain aluminum hydroxide powder, and the filtrate is further concentrated to obtain a refining agent raw material. The obtained clean water (including condensed water generated by the concentration on both sides) is transported to each water-using unit through a circulating water pump for internal digestion.

[0034] 7) The waste gas (including ammonia) generated during step 3), step 4) and step 5) is collected and sent to an ammonia recovery unit for recovery treatment (for example, by eluting to obtain ammonia water, and the deammoniation waste gas is mainly protective gas that can be recycled).

[0035] In the present invention, step 3), step 4) and step 5) are all carried out under an atmosphere with inert gas protection. The denitration gas is one of nitrogen, helium, neon and argon, preferably nitrogen.

[0036] In the present invention, the aluminum ash slag is one or more of aluminum ash slag I, aluminum ash slag II, and aluminum ash slag III. Preferably, aluminum ash slag I, aluminum ash slag II, and aluminum ash slag III are mixed in a mass ratio of 1-3:1-2:1.5-3, preferably 1.6-2:1.1-1.5:2-2.5. Wherein: aluminum ash slag I includes: Al content 39%-42%, Ca content 2%-3.5%, Mg content 0%-1.2%, F content 1%-3%, Cl content 10%-12%, S content 0.5%-0.8%, N content 1%-5%.

[0037] Aluminum ash slag II includes: Al content 20% to 32%, Ca content 2.5% to 4.5%, Mg content 2.2% to 4%, F content 1.5% to 2%, Cl content 6% to 9%, S content 0.2% to 0.5%, and N content 2% to 4%.

[0038] Aluminum ash slag III includes: Al content 40% to 48%, Ca content 0% to 1%, Mg content 1.8% to 3.8%, F content 2% to 3%, Cl content 1% to 5%, S content 0.4% to 0.5%, and N content 3% to 4%.

[0039] In the present invention, the particle size of the coarse aluminum ash in step 1) is 1.8-5 mm, preferably 2-4 mm, more preferably 2.5-3.5 mm. The particle size of the fine aluminum ash is 0.5-1.9 mm, preferably 1-1.7 mm, more preferably 1.2-1.5 mm.

[0040] In the present invention, the particle size of the coarse mixture in step 3) is 1.5-5 mm, preferably 2-4.5 mm, more preferably 2.5-4 mm. The particle size of the fine mixture is 0.5-2 mm, preferably 0.8-1.8 mm, more preferably 1-1.5 mm.

[0041] In the present invention, the fluorine-fixing agent in step 3) is calcium acetate and / or calcium magnesium acetate, preferably a mixture of calcium acetate and calcium magnesium acetate, the mixing mass ratio of the two being 1:1.5-5, preferably 1:2-3.

[0042] In the present invention, the catalyst in step 3) is a mixture of polymethyl acrylate and calcium oxide. Preferably, the mixing mass ratio of polymethyl acrylate to calcium oxide is 1:3.5-8, preferably 1:4-5.5.

[0043] In the present invention, the amount of the fluorine-fixing agent added is 2-8% of the mass of the fine aluminum ash slag, preferably 3-5%, for example, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.5%, 5%. The amount of the catalyst added is 3-10% of the mass of the fine aluminum ash slag, preferably 4-8%, for example, 3%, 3.5%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%.

[0044] In the present invention, the oxidation treatment in step 4) is to introduce an oxidizing gas into the fine mixture to carry out an oxidation reaction. The oxidizing gas is oxygen or ozone.

[0045] In the present invention, the desulfurization reaction in step 4) is specifically as follows: carbon dioxide is introduced into the oxidized fine mixture. The amount of carbon dioxide introduced is 10-30m 3 / h, preferably 15-25m 3 / h. The reaction time is 30-120 min, preferably 40-100 min.

[0046] In the present invention, the flocculant in step 5) is nonionic polyacrylamide. The mixing mass ratio of the sulfur-fixing material, the flocculant, and water is 50-58:5-9:40-50, preferably 52-56:6-8:42-48. The sedimentation treatment time is 30-120 minutes, preferably 40-100 minutes.

[0047] In the present invention, the concentration multiple of the sedimentation liquid in step 6) is 2-7 times, preferably 2.5-5 times. Adjusting the pH of the concentrated liquid specifically adjusts the pH of the concentrated liquid and / or the concentrated brine to 7-8.5, preferably 7.5-8.2. The concentration multiple of the filtrate is 2-6 times, preferably 3-5 times.

[0048] In the present invention, firstly, most of the metallic aluminum in the aluminum ash is recovered by mechanical dry separation in an aluminum ash pretreatment unit. The specific process is as follows: the aluminum ash slag is loaded into the aluminum ash slag bin, and enters the vibrating feeder through the chute under the aluminum ash slag bin outlet. The vibration anti-blocking device at the aluminum ash slag bin outlet can prevent the aluminum ash slag from blocking the aluminum ash slag bin outlet. The vibrating feeder then passes the aluminum ash slag through the chute into the crusher (such as a jaw crusher) to be crushed to 5-10mm. The crushed aluminum ash slag is transported to a ball mill (such as a double-bin ball mill) via a belt conveyor to be ball-milled to 1-3mm. The ground aluminum ash slag enters the vibrating screen for screening, and the material on the screen is transported to a manual trolley via a belt conveyor. The manual trolley transports the material on the screen to the aluminum melting furnace; the material under the vibrating screen is transported to the drum screen via a bucket elevator for rolling screening, and the material on the drum screen is transported to the manual trolley via a belt conveyor. The manual trolley then transports the material on the screen to the aluminum melting furnace; the material under the aluminum ash drum screen enters the screw conveyor via the screen bucket, and then is transported to the aluminum ash bin via a bucket elevator. The aluminum melting furnace melts the bulk materials containing aluminum to produce aluminum. The obtained aluminum liquid is transported to the ingot casting device through the conveying device to obtain aluminum ingots. Finally, the aluminum ingots are stacked in the transfer area by the stacking robot for standby. At the same time, the collected smoke is sent to the dry belt dust collector and the aluminum melting dust removal device for dust removal through the dust suction pipe and the dust removal hoods at various places, and the dust-removed smoke is discharged through the chimney. That is, through mechanical and physical processes such as crushing, ball milling, and screening, the separation of metal aluminum from impurities is initially achieved (equivalent to stripping and enriching metal aluminum from the slag phase), and then the impurities mixed in the metal aluminum are removed in reverse by smelting (the slag also contains aluminum, so it is mixed and circulated with other aluminum ash and slag for the aforementioned treatment), and finally high-quality metal aluminum ingots are obtained.

[0049] In the present invention, the fine aluminum ash slag in the aluminum ash bin contains more impurities and aluminum, and part of the aluminum element exists in the form of a stable compound. The fine aluminum ash slag is transported to the slag aluminum catalytic separation mechanism and a specific fluorine-fixing agent and catalyst are added to fix the fluorine in the fine aluminum ash slag while promoting the consolidation of aluminum-containing powder. That is, under the joint action of the fluorine-fixing agent and the catalyst, part of the aluminum-containing powder in the fine aluminum ash slag is solidified into large particles (high aluminum content) and separated by the second screening mechanism (high-frequency vibration screening machine), and the large particles are returned to the aluminum melting furnace for high-temperature smelting to further achieve the separation and recovery of metallic aluminum and impurities.

[0050] In the present invention, the fluorine-fixing agent is calcium acetate and / or calcium-magnesium acetate, preferably a mixture of calcium acetate and calcium-magnesium acetate, and the mixing mass ratio of the two is 1:1.5-5 (preferably 1:2-3). The catalyst is a mixture of polymethyl acrylate and calcium oxide, and the mixing mass ratio of the two is 1:3.5-8 (preferably 1:4-5). During the reaction process, the catalyst can promote the reaction and also promote the consolidation of aluminum-containing powder. The mixing ratio of polymethyl acrylate and calcium oxide is too large or too small, which will reduce the catalytic effect. The addition method of the fluorine-fixing agent is the same as that of the catalyst, that is, two catalyst stirring tanks are provided in the slag aluminum catalytic separation mechanism, one of which is used to add the catalyst and the other is used to reinforce the fluorine-fixing agent.

[0051] In the present invention, since the aluminum ash slag also contains a certain amount of sulfur element, the undersize material of the second screening mechanism is transported to the reaction mechanism and subjected to one or more enhanced reactions under the protection of an inert gas, and then an oxidizing gas (such as ozone) is introduced and stirred to carry out an oxidation reaction on the sulfur element, and finally carbon dioxide is introduced and stirred continuously to achieve sulfur fixation treatment, that is, by introducing carbon dioxide into the material to generate an acidic environment, and under the high-intensity oxidation of ozone, the sulfide in the material forms a calcium sulfate stabilizer in the acidic environment to achieve sulfur fixation.

[0052] In the present invention, the solid sulfur material after the solid sulfur reaction is transported to the flocculation and sedimentation mechanism, and a flocculant (such as nonionic polyacrylamide) and water are added in a certain proportion to carry out a mixed sedimentation reaction, and the micro-particles produced in the material after the solid sulfur reaction, as well as the micro-particles produced in the above steps, are condensed, thereby promoting the sinking of the condensate and the clarification of the liquid, and after the carbon dioxide is introduced, water is added to form an acidic environment, so that most of the aluminum-containing substances are dissolved, and the aluminum-free materials form a precipitate under the action of the flocculant, so as to facilitate removal. Finally, the material after the solid sulfur sedimentation is filtered to obtain a filter residue (the composition of the filter residue is relatively complex, with carbonates and a small amount of sulfates, and the fixed fluorine also enters the filter residue. As a concrete raw material, the concrete raw material can be used to make low-strength concrete, and the filter residue can be used as a resource) and a filtrate. The filter residue is dried to obtain a concrete raw material. The filtrate is concentrated or membrane filtered to obtain a concentrated salt solution and clean water (including evaporated condensed water), and the clean water can be recycled. The pH value of the concentrated salt solution is adjusted while the concentrated salt solution is crystallized, so that the metal impurities other than aluminum in the concentrated salt solution can continue to be dissolved, and aluminum hydroxide precipitation can be precipitated to improve the purity of aluminum hydroxide. After the crystallization precipitation is completed, a second filtration is performed to obtain aluminum hydroxide wet powder and a second filtrate, and the aluminum hydroxide wet powder is dried to obtain aluminum hydroxide powder. At the same time, the second filtrate is continuously evaporated and concentrated to obtain the refining agent raw material. The refining agent raw material is a powdered or granular flux composed of a variety of inorganic salts (that is, a variety of inorganic salts are obtained after the filtrate is concentrated). Its use is: in the refining of aluminum, it can be used to remove hydrogen and floating oxide inclusions in the aluminum liquid.

[0053] In the present invention, the processing process of the resource recovery unit is specifically as follows: the fine aluminum ash slag in the aluminum ash bin falls into the quantitative feeder through the chute, and the quantitative feeder sends a quantitative amount of fine aluminum ash slag to the screw feeder according to the setting, and the screw feeder then sends the fine aluminum ash slag to the slag-aluminum separator, and the catalyst is added to the slag-aluminum separator, and separation treatment is carried out under an inert gas atmosphere. After the treatment, it enters the second screening mechanism after the high-frequency screen feeding device. The high-frequency screen feeding device has a stirring function, and stirs the material under an inert gas atmosphere. The second screening mechanism screens the material under an inert gas atmosphere, and the screened material enters the manual trolley through the chute, and the manual trolley then transports the material to the aluminum melting furnace for aluminum smelting. The materials screened by the second screening mechanism enter multiple (for example, 2) enhanced reaction stirring tanks through the chute in sequence, and then enter the oxidation stirring tank, and then introduce ozone in the inert gas atmosphere for cyclic oxidation reaction, and then enter the carbon dioxide adjustment tank, and then introduce carbon dioxide in the inert gas atmosphere for cyclic sulfur fixation reaction, and then enter the sedimentation tank through the sedimentation tank feeding pump, and then add flocculants to the sedimentation tank through the flocculant stirring tank and the flocculant stirring tank screw pump (flocculant feeding pump). The sedimentation tank is subjected to sedimentation reaction in the inert gas atmosphere, and the materials after the sedimentation reaction enter the belt filter through the belt filter feeding pump for pressure filtration to obtain filtrate and filter residue. The filter residue enters the dryer through the chute for drying, and the dried residue enters the storage bin for storage through the bucket elevator. The residue in the storage bin is then processed by the dry powder packaging and transportation device to become concrete raw materials. The discharge port of the storage bin is also equipped with a vibrating anti-blocking device to prevent the material from blocking the outlet. The dust removal hood installed in the dryer and storage bin collects the dust-containing flue gas into the wet bag dust collector for dust removal before being discharged out through the chimney.

[0054] Furthermore, the filtrate produced by the belt filter reaches the concentrated brine pool, part of the filtrate enters the circulating water pool after passing through the filter membrane, and then goes to the flocculant stirring tank, belt filter, catalyst stirring tank, high-frequency screen and other devices through various water pipes through the circulating water pump, and the remaining filtrate in the concentrated brine pool is pumped to the external brine treatment system (i.e., concentrated aluminum precipitation treatment is carried out to recover aluminum hydroxide powder and refining agent raw materials) through the concentrated brine pump.

[0055] In the present invention, the air compressor in the inert gas protection unit processes the air and then enters the gas storage tank, and then the inert gas is prepared by the inert gas preparation device, and then the inert gas is sent to the slag aluminum separator, the high-frequency screen feeding device, the enhanced reaction stirring tank, the oxidation stirring tank, the carbon dioxide adjustment tank, the sedimentation tank and other devices through a plurality of air pipes.

[0056] In the present invention, ammonia is generated in the separator, high-frequency screen feeding device, enhanced reaction stirring tank, oxidation stirring tank, carbon dioxide regulating tank, sedimentation tank and other devices, so ammonia is also collected by a number of ammonia hoods and ammonia pipes, and then sent to the ammonia recovery system for ammonia recovery. That is, during these processes, a protective gas (such as nitrogen) is introduced to construct a protective atmosphere, and the generated ammonia is taken out and sent to a special leaching device to perform leaching, absorption and separation of the ammonia carried out to obtain ammonia water, thereby realizing the resource recovery of harmful waste gas. And the protective gas after removing the ammonia can also be recycled.

[0057] In the present invention, the aluminum ash slag is a mixed aluminum ash slag obtained by mixing aluminum ash slags with significantly different components. In the existing production process of raw aluminum, due to the different sources of raw ore, the component content of the aluminum ash slag finally obtained is significantly different. Some aluminum ash slags have a higher chlorine content (for example, raw ore produced by coastal factories or coastal mining areas), while some aluminum ash slags have a higher calcium or magnesium content. Due to the differences in the fluctuations in the content of recyclable elements in aluminum ash slag, targeted considerations are inevitably required in the process of fully resource-based recycling and treatment of them. Therefore, it is impossible to use the same set of treatment processes to match aluminum ash slags with a variety of different component contents. Establishing a special resource production line for each type of aluminum ash slag will result in excessive investment costs and difficulty in full resource recycling. It does not have economic effects and cannot meet the needs of economic enterprises. The present invention mixes three special components of aluminum ash slag and studies and develops a set of processes for the full resource utilization of mixed aluminum ash slag. On the one hand, it realizes the purpose of recycling multiple aluminum ash slags with the same resource utilization process; on the other hand, aluminum ash slags containing different components complement each other, which can promote and improve the quality of resource products recycled at all levels, and truly and efficiently realize the full resource utilization of aluminum ash slag. All aluminum ash slag is recycled: metal aluminum sheets are recycled; ammonia water is formed into products for sale; high-aluminum materials are sold to alumina production plants, floor tile plants or water purifier plants; high-salt water is used to extract refining agent raw materials to form products for sale; concrete raw materials are used for concrete preparation.

[0058] In the present invention, each feeding mechanism (the first feeding mechanism to the tenth feeding mechanism) is independently one or more of a belt conveyor, a chute, a chute pipe, a bucket elevator, a transport vehicle, etc. A reasonable selection can be made according to actual working conditions, as long as the purpose of conveying the corresponding materials can be met.

[0059] In the present invention, the height of the aluminum ash slag bin is 1-60m, preferably 2-40m, and more preferably 3-30m.

[0060] Compared with the prior art, the present invention has the following beneficial technical effects:

[0061] 1: The aluminum ash slag treatment system of the present invention combines a dry pretreatment unit with a wet resource recovery unit, which not only improves the recovery effect and efficiency of aluminum resources in the aluminum ash slag, but also greatly reduces or even avoids the discharge of secondary pollutants, thereby achieving efficient and green recovery of aluminum ash slag.

[0062] 2: The aluminum ash slag treatment system of the present invention realizes the resource recovery of multiple elements in aluminum ash slag through the coordinated disposal of various units, and the various products obtained are of good quality, high strength, high economic benefits, and also have the advantages of simple structure, easy operation, environmental friendliness, and low operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 The figure is a simplified structural diagram of the system of the present invention.

[0064] Figure 2 It is a schematic diagram of the overall structure of the aluminum ash slag pretreatment unit of the present invention.

[0065] Figure 3 This is a simplified structural diagram of the resource recovery unit of the present invention.

[0066] Figure 4 It is a schematic diagram of the overall structure of the resource recovery unit of the present invention.

[0067] Figure numerals: 1: aluminum ash slag bin; 2: crusher; 3: ball mill; 4: first screening mechanism; 401: vibrating screen; 402: drum screen; 5: aluminum melting furnace; 6: aluminum ash bin; 7: slag aluminum catalytic separation mechanism; 701: separator; 702: catalyst stirring tank; 703: catalyst feeding pipe; 704: catalyst feeding pump; 705: screw feeder; 8: second screening mechanism; 801: high-frequency screen feeding device; 802: high-frequency screen feeding pipe; 8 03: high frequency screen feed pump; 9: reaction mechanism; 901: enhanced reaction stirring tank; 902: oxidation stirring tank; 903: carbon dioxide regulating tank; 904: ozone adding device; 905: carbon dioxide adding device; 906: enhanced reaction circulation pump mechanism; 907: oxidation stirring circulation pump mechanism; 908: carbon dioxide regulating circulation pump mechanism; 10: flocculation sedimentation mechanism; 1001: sedimentation tank; 1002: flocculant stirring tank; 1003: flocculation Coagulant feeding pipe; 1004: flocculant feeding pump; 1005: sedimentation feeding pump; 11: filtering and drying mechanism; 1101: belt filter; 1102: drying machine; 1103: bucket elevator; 1104: storage bin; 1105: clean water pump; 1106: concentrated brine pool; 1107: circulating water pool; 1108: filter membrane; 1109: circulating water pump; 12: dry belt dust collector; 13: aluminum molten dust removal device; 14: ingot casting device; 15: Palletizing robot; 16: Air compressor; 17: Gas storage tank; 18: Inert gas preparation device; 19: Ammonia recovery unit; 20: Wet belt dust collector; Y1: First feeding mechanism; Y2: Second feeding mechanism; Y3: Third feeding mechanism; Y4: Fourth feeding mechanism; Y5: Fifth feeding mechanism; Y6: Sixth feeding mechanism; Y7: Seventh feeding mechanism; Y8: Eighth feeding mechanism; Y9: Ninth feeding mechanism; Y10: Tenth feeding mechanism. DETAILED DESCRIPTION

[0068] The technical solution of the present invention is illustrated below by way of example, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0069] An aluminum ash slag treatment system, the system includes an aluminum ash slag pretreatment unit and a resource recovery unit. The aluminum ash slag pretreatment unit includes an aluminum ash slag bin 1, a crusher 2, a ball mill 3, a first screening mechanism 4 and an aluminum melting furnace 5 arranged in series. The resource recovery unit includes an aluminum ash bin 6, a slag aluminum catalytic separation mechanism 7, a second screening mechanism 8, a reaction mechanism 9, a flocculation sedimentation mechanism 10 and a filtering and drying mechanism 11 arranged in series. Among them, the upper screen discharge port of the first screening mechanism 4 is connected to the feed port of the aluminum melting furnace 5 through the first feeding mechanism Y1, and the lower screen discharge port of the first screening mechanism 4 is connected to the feed port of the aluminum ash bin 6 through the second feeding mechanism Y2. The upper screen discharge port of the second screening mechanism 8 is connected to the feed port of the aluminum melting furnace 5 through the third feeding mechanism Y3, and the lower screen discharge port of the second screening mechanism 8 is connected to the feed port of the reaction mechanism 9 through the fourth feeding mechanism Y4.

[0070] Preferably, the first screening mechanism 4 comprises a vibrating screen 401 and a drum screen 402 connected in series. The upper discharge port of the vibrating screen 401 is connected to the feed port of the aluminum melting furnace 5 through the first feeding mechanism Y1, and the lower discharge port of the vibrating screen 401 is connected to the feed port of the drum screen 402 through the fifth feeding mechanism Y5. The upper discharge port of the drum screen 402 is connected to the feed port of the aluminum melting furnace 5 through the sixth feeding mechanism Y6, and the lower discharge port of the drum screen 402 is connected to the feed port of the aluminum ash bin 6 through the second feeding mechanism Y2.

[0071] Preferably, the mesh size of the vibrating screen 401 is 5-10 mm, and the mesh size of the drum screen 402 is 1-3 mm.

[0072] Preferably, the aluminum ash slag pretreatment unit also includes a dry belt dust collector 12 and an aluminum molten dust removal device 13. The air inlet of the dry belt dust collector 12 is independently connected to the feed end and / or discharge end of the aluminum ash slag bin 1, the feed end and / or discharge end of the crusher 2, the feed end and / or discharge end of the ball mill 3, the feed end and / or discharge end of the vibrating screen 401, the feed end and / or discharge end of the drum screen 402, and the feed end and / or discharge end of the aluminum ash bin 6 through multiple dust suction pipes and multiple dust suction hoods. The air inlet of the aluminum molten dust removal device 13 is connected to the exhaust port of the aluminum molten furnace 5 through a dust suction pipe and a dust suction hood. The exhaust port of the dry belt dust collector 12 and the exhaust port of the aluminum molten dust removal device 13 are both connected to the chimney through an exhaust pipe.

[0073] Preferably, a vibration anti-blocking device is provided at the discharge port of the aluminum ash slag bin 1 and the aluminum ash bin 6. A vibrating feeder is also provided between the discharge port of the aluminum ash slag bin 1 and the feed port of the crusher 2. A quantitative feeder is also provided between the discharge port of the aluminum ash bin 6 and the feed port of the aluminum slag catalytic separation mechanism 7.

[0074] Preferably, the system further comprises an ingot casting device 14. The feed port of the ingot casting device 14 is connected to the molten liquid outlet of the aluminum melting furnace 5 through an aluminum liquid conveying mechanism. A stacking robot 15 is also provided at the discharge end of the ingot casting device 14.

[0075] Preferably, the slag aluminum catalytic separation mechanism 7 includes a separator 701 and a catalyst stirring tank 702. The discharge port of the catalyst stirring tank 702 is connected to the feed port of the separator 701 through a catalyst feeding pipe 703 and a catalyst feeding pump 704. The feed port of the separator 701 is also connected to the discharge port of the aluminum ash bin 6 through the seventh feeding mechanism Y7. The discharge port of the separator 701 is connected to the feed port of the second screening mechanism 8 through the eighth feeding mechanism Y8. Preferably, a screw feeder 705 is also provided between the separator 701 and the seventh feeding mechanism Y7.

[0076] Preferably, the slag-aluminum catalytic separation mechanism 7 includes a plurality of catalyst stirring tanks 702 , and each catalyst stirring tank 702 is connected to the feed port of the separator 701 via an independent catalyst feeding pipe 703 and a catalyst feeding pump 704 .

[0077] Preferably, the second screening mechanism 8 is a high-frequency vibrating screen, and the sieve hole diameter of the second screening mechanism 8 is 1.5-5 mm.

[0078] Preferably, a high-frequency screen feeding device 801 is provided between the second screening mechanism 8 and the eighth feeding mechanism Y8. The discharge port of the high-frequency screen feeding device 801 is connected to the feed port of the second screening mechanism 8 through a high-frequency screen feeding pipe 802 and a high-frequency screen feeding pump 803.

[0079] Preferably, the reaction mechanism 9 comprises an enhanced reaction stirring tank 901, an oxidation stirring tank 902 and a carbon dioxide regulating tank 903 which are sequentially arranged in series. An ozone adding device 904 is arranged on the oxidation stirring tank 902. A carbon dioxide adding device 905 is arranged on the carbon dioxide regulating tank 903. Preferably, the reaction mechanism 9 comprises a plurality of enhanced reaction stirring tanks 901 which are sequentially connected in series.

[0080] Preferably, a circulating feed port and a circulating discharge port are also provided on the enhanced reaction stirring tank 901 , and the circulating discharge port of the enhanced reaction stirring tank 901 is connected to the circulating discharge port of the enhanced reaction stirring tank 901 through an enhanced reaction circulation pump mechanism 906 .

[0081] Preferably, a circulating feed port and a circulating discharge port are also provided on the oxidation stirring tank 902 , and the circulating discharge port of the oxidation stirring tank 902 is connected to the circulating discharge port of the oxidation stirring tank 902 via an oxidation stirring circulation pump mechanism 907 .

[0082] Preferably, a circulating feed port and a circulating discharge port are also provided on the carbon dioxide regulating tank 903 , and the circulating discharge port of the carbon dioxide regulating tank 903 is connected to the circulating discharge port of the carbon dioxide regulating tank 903 through a carbon dioxide regulating circulating pump mechanism 908 .

[0083] Preferably, the flocculation sedimentation mechanism 10 includes a sedimentation tank 1001 and a flocculant stirring tank 1002. The feed port of the sedimentation tank 1001 is connected to the feed port of the carbon dioxide adjustment tank 903 through the ninth feeding mechanism Y9. The discharge port of the sedimentation tank 1001 is connected to the feed port of the filtration and drying mechanism 11 through the tenth feeding mechanism Y10. The discharge port of the flocculant stirring tank 1002 is connected to the feed port of the sedimentation tank 1001 through the flocculant feeding pipe 1003 and the flocculant feeding pump 1004. Preferably, a sedimentation feeding pump 1005 is also provided on the ninth feeding mechanism Y9.

[0084] Preferably, the flocculation and sedimentation mechanism 10 includes a plurality of flocculant stirring tanks 1002 , and each flocculant stirring tank 1002 is connected to a feed port of the sedimentation tank 1001 via an independent flocculant feeding pipe 1003 and a flocculant feeding pump 1004 .

[0085] Preferably, the system further comprises an inert gas protection unit, which comprises an air compressor 16, a gas storage tank 17 and an inert gas preparation device 18 connected in series in sequence. The exhaust port of the inert gas preparation device 18 is independently connected to the air inlet of the separator 701, the air inlet of the second screening mechanism 8, the air inlet of the high-frequency screen feeding device 801, the air inlet of the enhanced reaction stirring tank 901, the air inlet of the oxidation stirring tank 902, the air inlet of the carbon dioxide adjustment tank 903, and the air inlet of the sedimentation tank 1001 through gas pipelines.

[0086] Preferably, the system also includes an ammonia recovery unit 19, the air inlet of the ammonia recovery unit 19 is independently connected to the exhaust port of the separator 701, the exhaust port of the second screening mechanism 8, the exhaust port of the high-frequency screen feeding device 801, the exhaust port of the enhanced reaction stirring tank 901, the exhaust port of the oxidation stirring tank 902, the exhaust port of the carbon dioxide adjustment tank 903, and the exhaust port of the sedimentation tank 1001 through the gas pipe cover.

[0087] Preferably, the filtering and drying mechanism 11 comprises a belt filter 1101, a drying machine 1102, a bucket elevator 1103 and a storage bin 1104 which are connected in series in sequence. The water inlet of the belt filter 1101 is connected to the clean water pump 1105 through a water inlet pipe, and the water outlet of the belt filter 1101 is connected to the concentrated brine pool 1106 through a drain pipe. Preferably, a circulating water pool 1107 is also provided on one side of the concentrated brine pool 1106, and the concentrated brine pool 1106 is connected to the circulating water pool 1107 through a filter membrane 1108. The circulating water pool 1107 is independently connected to the water inlet of the belt filter 1101, the water inlet of the flocculant stirring tank 1002, the water inlet of the second screening mechanism 8, and the water inlet of the catalyst stirring tank 702 through a circulating water pump 1109 and a plurality of circulating water pipes.

[0088] Preferably, the system also includes a wet belt dust collector 20, the air inlet of the wet belt dust collector 20 is independently connected to the discharge end of the dryer 1102 and the discharge end of the storage bin 1104 through multiple dust suction pipes and multiple dust suction hoods, and the exhaust port of the wet belt dust collector 20 is connected to the chimney through an exhaust pipe.

[0089] Example 1

[0090] like Figure 1-4 As shown, an aluminum ash slag treatment system includes an aluminum ash slag pretreatment unit and a resource recovery unit. The aluminum ash slag pretreatment unit includes an aluminum ash slag bin 1, a crusher 2, a ball mill 3, a first screening mechanism 4 and an aluminum melting furnace 5 arranged in series. The resource recovery unit includes an aluminum ash bin 6, a slag aluminum catalytic separation mechanism 7, a second screening mechanism 8, a reaction mechanism 9, a flocculation sedimentation mechanism 10 and a filtering and drying mechanism 11 arranged in series. Among them, the upper screen discharge port of the first screening mechanism 4 is connected to the feed port of the aluminum melting furnace 5 through the first feeding mechanism Y1, and the lower screen discharge port of the first screening mechanism 4 is connected to the feed port of the aluminum ash bin 6 through the second feeding mechanism Y2. The upper screen discharge port of the second screening mechanism 8 is connected to the feed port of the aluminum melting furnace 5 through the third feeding mechanism Y3, and the lower screen discharge port of the second screening mechanism 8 is connected to the feed port of the reaction mechanism 9 through the fourth feeding mechanism Y4.

[0091] Example 2

[0092] Example 1 is repeated, except that the first screening mechanism 4 includes a vibrating screen 401 and a drum screen 402 connected in series. The upper discharge port of the vibrating screen 401 is connected to the feed port of the aluminum melting furnace 5 through the first feeding mechanism Y1, and the lower discharge port of the vibrating screen 401 is connected to the feed port of the drum screen 402 through the fifth feeding mechanism Y5. The upper discharge port of the drum screen 402 is connected to the feed port of the aluminum melting furnace 5 through the sixth feeding mechanism Y6, and the lower discharge port of the drum screen 402 is connected to the feed port of the aluminum ash bin 6 through the second feeding mechanism Y2.

[0093] Example 3

[0094] Example 2 was repeated except that the mesh size of the vibration screen 401 was 8 mm and the mesh size of the drum screen 402 was 3 mm.

[0095] Example 4

[0096] Example 2 was repeated except that the mesh size of the vibration screen 401 was 5 mm and the mesh size of the drum screen 402 was 2.5 mm.

[0097] Example 5

[0098] Example 4 is repeated, except that the aluminum ash slag pretreatment unit also includes a dry belt dust collector 12 and an aluminum slag dust removal device 13. The air inlet of the dry belt dust collector 12 is independently connected to the feed end and discharge end of the aluminum ash slag bin 1, the feed end and discharge end of the crusher 2, the feed end and discharge end of the ball mill 3, the feed end and discharge end of the vibrating screen 401, the feed end and discharge end of the drum screen 402, and the feed end and discharge end of the aluminum ash bin 6 through multiple dust suction pipes and multiple dust suction hoods. The air inlet of the aluminum slag dust removal device 13 is connected to the exhaust port of the aluminum slag furnace 5 through a dust suction pipe and a dust suction hood. The exhaust port of the dry belt dust collector 12 and the exhaust port of the aluminum slag dust removal device 13 are both connected to the chimney through an exhaust pipe.

[0099] Example 6

[0100] Example 5 was repeated, except that a vibration anti-blocking device was provided at the discharge port of the aluminum ash slag bin 1 and the aluminum ash bin 6. A vibrating feeder was also provided between the discharge port of the aluminum ash slag bin 1 and the feed port of the crusher 2. A quantitative feeder was also provided between the discharge port of the aluminum ash bin 6 and the feed port of the aluminum slag catalytic separation mechanism 7.

[0101] Example 7

[0102] The embodiment 6 is repeated, except that the system further includes an ingot casting device 14. The feed port of the ingot casting device 14 is connected to the molten liquid outlet of the aluminum melting furnace 5 through an aluminum liquid conveying mechanism. A stacking robot 15 is also provided at the discharge end of the ingot casting device 14.

[0103] Example 8

[0104] Example 7 is repeated, except that the slag aluminum catalytic separation mechanism 7 includes a separator 701 and a catalyst stirring tank 702. The discharge port of the catalyst stirring tank 702 is connected to the feed port of the separator 701 through a catalyst feeding pipe 703 and a catalyst feeding pump 704. The feed port of the separator 701 is also connected to the discharge port of the aluminum ash bin 6 through the seventh feeding mechanism Y7. The discharge port of the separator 701 is connected to the feed port of the second screening mechanism 8 through the eighth feeding mechanism Y8. A screw feeder 705 is also provided between the separator 701 and the seventh feeding mechanism Y7.

[0105] Example 9

[0106] Example 8 is repeated, except that the slag-aluminum catalytic separation mechanism 7 includes a plurality of catalyst stirring tanks 702 , and each catalyst stirring tank 702 is connected to the feed port of the separator 701 through an independent catalyst feeding pipe 703 and a catalyst feeding pump 704 .

[0107] Example 10

[0108] The embodiment 9 is repeated, except that the second screening mechanism 8 is a high-frequency vibrating screen. The aperture of the screen hole of the second screening mechanism 8 is 4.5 mm.

[0109] Embodiment 11

[0110] Example 9 is repeated, except that the second screening mechanism 8 is a high-frequency vibrating screen. The sieve hole diameter of the second screening mechanism 8 is 4 mm.

[0111] Example 12

[0112] Repeat Example 11, except that a high-frequency screen feeding device 801 is further provided between the second screening mechanism 8 and the eighth feeding mechanism Y8. The discharge port of the high-frequency screen feeding device 801 is connected to the feed port of the second screening mechanism 8 through a high-frequency screen feeding pipe 802 and a high-frequency screen feeding pump 803.

[0113] Example 13

[0114] Example 12 is repeated, except that the reaction mechanism 9 includes an enhanced reaction stirring tank 901, an oxidation stirring tank 902, and a carbon dioxide regulating tank 903 which are sequentially arranged in series. An ozone adding device 904 is arranged on the oxidation stirring tank 902. A carbon dioxide adding device 905 is arranged on the carbon dioxide regulating tank 903.

[0115] Embodiment 14

[0116] Example 13 is repeated, except that the reaction mechanism 9 includes two enhanced reaction stirring tanks 901, and the two enhanced reaction stirring tanks 901 are connected in series.

[0117] Embodiment 15

[0118] Example 14 is repeated, except that a circulating feed port and a circulating discharge port are further provided on the enhanced reaction stirring tank 901 , and the circulating discharge port of the enhanced reaction stirring tank 901 is connected to the circulating discharge port of the enhanced reaction stirring tank 901 through an enhanced reaction circulation pump mechanism 906 .

[0119] Example 16

[0120] Example 15 is repeated, except that a circulating feed port and a circulating discharge port are further provided on the oxidation stirring tank 902, and the circulating discharge port of the oxidation stirring tank 902 is connected to the circulating discharge port of the oxidation stirring tank 902 through an oxidation stirring circulation pump mechanism 907.

[0121] Embodiment 17

[0122] Example 16 is repeated, except that a circulating feed port and a circulating discharge port are further provided on the carbon dioxide regulating tank 903, and the circulating discharge port of the carbon dioxide regulating tank 903 is connected to the circulating discharge port of the carbon dioxide regulating tank 903 through a carbon dioxide regulating circulation pump mechanism 908.

[0123] Embodiment 18

[0124] Example 17 is repeated, except that the flocculation sedimentation mechanism 10 includes a sedimentation tank 1001 and a flocculant stirring tank 1002. The feed port of the sedimentation tank 1001 is connected to the feed port of the carbon dioxide adjustment tank 903 through the ninth feeding mechanism Y9. The discharge port of the sedimentation tank 1001 is connected to the feed port of the filtration and drying mechanism 11 through the tenth feeding mechanism Y10. The discharge port of the flocculant stirring tank 1002 is connected to the feed port of the sedimentation tank 1001 through the flocculant feeding pipe 1003 and the flocculant feeding pump 1004. A sedimentation feeding pump 1005 is also provided on the ninth feeding mechanism Y9.

[0125] Embodiment 19

[0126] Example 18 is repeated, except that the flocculation and sedimentation mechanism 10 includes a plurality of flocculant stirring tanks 1002 , and each flocculant stirring tank 1002 is connected to the feed port of the sedimentation tank 1001 through an independent flocculant feeding pipe 1003 and a flocculant feeding pump 1004 .

[0127] Embodiment 20

[0128] Example 19 is repeated, except that the system further includes an inert gas protection unit, which includes an air compressor 16, a gas storage tank 17, and an inert gas preparation device 18 connected in series. The exhaust port of the inert gas preparation device 18 is independently connected to the air inlet of the separator 701, the air inlet of the second screening mechanism 8, the air inlet of the high-frequency screen feeding device 801, the air inlet of the enhanced reaction stirring tank 901, the air inlet of the oxidation stirring tank 902, the air inlet of the carbon dioxide adjustment tank 903, and the air inlet of the sedimentation tank 1001 through gas pipelines.

[0129] Embodiment 21

[0130] Example 20 is repeated, except that the system also includes an ammonia recovery unit 19, and the air inlet of the ammonia recovery unit 19 is independently connected to the exhaust port of the separator 701, the exhaust port of the second screening mechanism 8, the exhaust port of the high-frequency screen feeding device 801, the exhaust port of the enhanced reaction stirring tank 901, the exhaust port of the oxidation stirring tank 902, the exhaust port of the carbon dioxide adjustment tank 903, and the exhaust port of the sedimentation tank 1001 through the gas pipe cover.

[0131] Embodiment 22

[0132] Example 21 is repeated, except that the filtering and drying mechanism 11 includes a belt filter 1101, a drying machine 1102, a bucket elevator 1103 and a storage bin 1104 connected in series. The water inlet of the belt filter 1101 is connected to the clean water pump 1105 through a water inlet pipe, and the water outlet of the belt filter 1101 is connected to the concentrated brine pool 1106 through a drainage pipe.

[0133] Embodiment 23

[0134] Example 22 is repeated, except that a circulating water pool 1107 is further provided on one side of the concentrated brine pool 1106, and the concentrated brine pool 1106 and the circulating water pool 1107 are connected via a filter membrane 1108. The circulating water pool 1107 is independently connected to the water inlet of the belt filter 1101, the water inlet of the flocculant stirring tank 1002, the water inlet of the second screening mechanism 8, and the water inlet of the catalyst stirring tank 702 through a circulating water pump 1109 and a plurality of circulating water pipes.

[0135] Embodiment 24

[0136] Example 23 is repeated, except that the system also includes a wet belt dust collector 20, and the air inlet of the wet belt dust collector 20 is independently connected to the discharge end of the dryer 1102 and the discharge end of the storage bin 1104 through multiple dust suction pipes and multiple dust suction hoods, and the exhaust port of the wet belt dust collector 20 is connected to the chimney through an exhaust pipe.

[0137] Application Example 1

[0138] The system described in Example 24 is used to treat aluminum ash slag, and the specific process is as follows:

[0139] The aluminum ash slag is a mixed aluminum ash slag in which aluminum ash slag I, aluminum ash slag II and aluminum ash slag III are mixed in a mass ratio of 1.8:1.3:2.4; the chemical composition of aluminum ash slag I is: Al content 39% to 42%, Si content 2% to 5%, Fe content 1% to 2%, Ca content 2% to 3.5%, Mg content 0% to 1.2%, F content 1% to 3%, Na content 2% to 7%, Cl content 10% to 12%, S content 0.5% to 0.8%, K content 0.2% to 0.4%, and N content 1% to 5%;

[0140] The chemical composition of aluminum ash slag II is: Al content 20% to 32%, Si content 1% to 4%, Fe content 1% to 1.5%, Ca content 2.5% to 4.5%, Mg content 2.2% to 4%, F content 1.5% to 2%, Na content 3% to 5%, Cl content 6% to 9%, S content 0.2% to 0.5%, K content 0.3% to 0.45%, N content 2% to 4%;

[0141] The chemical composition of aluminum ash slag III is: Al content 40% to 48%, Si content 3% to 4%, Fe content 0.5% to 1.8%, Ca content 0% to 1%, Mg content 1.8% to 3.8%, F content 2% to 3%, Na content 4% to 6%, Cl content 1% to 5%, S content 0.4% to 0.5%, K content 0.1% to 0.2%, and N content 3% to 4%.

[0142] 1) In the resource recovery unit, the aluminum ash slag is crushed and ground in turn by the crusher 2 and the ball mill 3, and then screened by the first screening mechanism 4 to obtain coarse aluminum ash slag and fine aluminum ash slag.

[0143] 2) The crude aluminum ash is transported to the aluminum melting furnace 5 to be heated and melted into a molten liquid, and after the scum is removed from the molten liquid, it is sent to the ingot casting device 14 for cooling and ingot casting to obtain an aluminum ingot. At the same time, the collected scum can be returned to the aluminum ash in step 1).

[0144] 3) Under the protection of nitrogen atmosphere, the fine aluminum ash is transported to the slag aluminum catalytic separation mechanism 7, and the fluorine-fixing agent and the catalyst are added to the fine aluminum ash to mix to obtain a mixture, and the mixture is transported to the second screening mechanism 8 for screening treatment to obtain a coarse mixture and a fine mixture. The coarse mixture is also sent to the aluminum melting furnace 5 for melting treatment; the fine mixture is subjected to the next step of treatment.

[0145] 4) Under the protection of nitrogen atmosphere, the fine mixed material is transported to the reaction mechanism 9 for enhanced mixing treatment, oxidation treatment and sulfur fixation reaction, and sulfur fixation material is obtained after the reaction is completed.

[0146] 5) Under the protection of nitrogen atmosphere, the solid sulfur material is transported to the flocculation and sedimentation mechanism 10 and mixed with flocculant and water for sedimentation treatment to obtain sediment residue and sediment liquid. The sediment residue is transported to the filtering and drying mechanism 11 for filtering and drying treatment and then used as concrete raw material, and the sediment liquid is processed in the next step.

[0147] 6) The sedimentation liquid is transported to the concentrated brine pool 1106 for membrane filtration, wherein concentrated brine and clean water are produced by membrane filtration through the filter membrane 110, the pH of the concentrated brine is adjusted to carry out aluminum precipitation reaction, and after the precipitation is completed, it is filtered, and the filter residue is dried to obtain aluminum hydroxide powder, and the filtrate is further concentrated to obtain the refining agent raw material. The obtained clean water is transported to each water-using unit through the circulating water pump 1109 for internal digestion.

[0148] 7) The ammonia-containing waste gas generated during step 3), step 4) and step 5) is collected and sent to the ammonia recovery unit 19 for recovery treatment (through elution, ammonia water is obtained, and the deammoniation waste gas is mainly ammonia which can be recycled).

[0149] In step 1), the particle size of the coarse aluminum ash is 2-5 mm; the particle size of the fine aluminum ash is 1-1.6 mm.

[0150] In step 3), the particle size of the coarse mixture is 1.6-5 mm; the particle size of the fine mixture is 1-1.5 mm. The fluorine-fixing agent is calcium acetate; the catalyst is a mixture of polymethyl acrylate and calcium oxide, and the mixing mass ratio of polymethyl acrylate to calcium oxide is 1:4.5; the amount of the fluorine-fixing agent added is 4% of the mass of the fine aluminum ash slag; the amount of the catalyst added is 7.5% of the mass of the fine aluminum ash slag.

[0151] In step 4), the oxidation treatment is to introduce ozone into the fine mixture for oxidation reaction; in step 4), the amount of carbon dioxide introduced is 20m 3 / h; reaction time is 80min.

[0152] In step 5), the flocculant is nonionic polyacrylamide; the mixing mass ratio of the sulfur-fixing material, the flocculant and water is 52:7:45; and the sedimentation treatment time is 70 minutes.

[0153] In step 6), the brine is concentrated 5 times; the pH of the concentrated solution is adjusted to 7-8.5; and the filtrate is concentrated 4 times.

[0154] Example 1 was applied repeatedly for several times, and various parameters were adjusted without changing the system structure and processing flow to further verify the feasibility of the system. The specific parameter comparison is shown in the following table:

[0155]

[0156]

[0157]

[0158] In the above table: I represents aluminum ash slag I, II represents aluminum ash slag II, and III represents aluminum ash slag III; the mixed in the fluorine-fixing agent composition represents the mixed mass ratio of calcium acetate and calcium magnesium acetate; the mixed in the catalyst represents the mixed mass ratio of polymethyl acrylate and calcium oxide. - represents none.

Claims

1. An aluminum ash treatment system, characterized in that: The system comprises an aluminum ash slag pretreatment unit and a resource recovery unit; the aluminum ash slag pretreatment unit comprises an aluminum ash slag bin (1), a crusher (2), a ball mill (3), a first screening mechanism (4) and an aluminum melting furnace (5) which are sequentially arranged in series; the resource recovery unit comprises an aluminum ash slag bin (6), a slag aluminum catalytic separation mechanism (7), a second screening mechanism (8), a reaction mechanism (9), a flocculation and sedimentation mechanism (10) and a filtering and drying mechanism (11) which are sequentially arranged in series; wherein the first screening mechanism The above-screen discharge port of the screening mechanism (4) is connected to the feed port of the aluminum melting furnace (5) through the first feeding mechanism (Y1), and the below-screen discharge port of the first screening mechanism (4) is connected to the feed port of the aluminum ash bin (6) through the second feeding mechanism (Y2); the above-screen discharge port of the second screening mechanism (8) is connected to the feed port of the aluminum melting furnace (5) through the third feeding mechanism (Y3), and the below-screen discharge port of the second screening mechanism (8) is connected to the feed port of the reaction mechanism (9) through the fourth feeding mechanism (Y4).

2. The system according to claim 1, characterized in that: The first screening mechanism (4) comprises a vibrating screen (401) and a drum screen (402) connected in series; the upper screen outlet of the vibrating screen (401) is connected to the feed port of the aluminum melting furnace (5) via a first feeding mechanism (Y1), and the lower screen outlet of the vibrating screen (401) is connected to the feed port of the drum screen (402) via a fifth feeding mechanism (Y5); the upper screen outlet of the drum screen (402) is connected to the feed port of the aluminum melting furnace (5) via a sixth feeding mechanism (Y6), and the lower screen outlet of the drum screen (402) is connected to the feed port of the aluminum ash bin (6) via a second feeding mechanism (Y2); Preferably, the mesh size of the vibrating screen (401) is 5-10 mm; the mesh size of the drum screen (402) is 1-3 mm.

3. The system according to claim 2, characterized in that: The aluminum ash slag pretreatment unit also includes a dry belt dust collector (12) and an aluminum molten dust removal device (13); the air inlet of the dry belt dust collector (12) is independently connected to the feed end and / or discharge end of the aluminum ash slag bin (1), the feed end and / or discharge end of the crusher (2), the feed end and / or discharge end of the ball mill (3), the feed end and / or discharge end of the vibrating screen (401), the feed end and / or discharge end of the drum screen (402), and the feed end and / or discharge end of the aluminum ash bin (6) through multiple dust suction pipes and multiple dust suction hoods; the air inlet of the aluminum molten dust removal device (13) is connected to the smoke exhaust port of the aluminum molten furnace (5) through the dust suction pipe and the dust suction hood; the exhaust port of the dry belt dust collector (12) and the exhaust port of the aluminum molten dust removal device (13) are both connected to the chimney through the exhaust pipe.

4. The system according to any one of claims 1 to 3, characterized in that: A vibration anti-blocking device is provided at the discharge port of the aluminum ash slag bin (1) and the aluminum ash bin (6); a vibrating feeder is also provided between the discharge port of the aluminum ash slag bin (1) and the feed port of the crusher (2); a quantitative feeder is also provided between the discharge port of the aluminum ash bin (6) and the feed port of the aluminum slag catalytic separation mechanism (7); and / or The system also includes an ingot casting device (14); a feed port of the ingot casting device (14) is connected to a molten liquid outlet of an aluminum melting furnace (5) via an aluminum liquid conveying mechanism; and a stacking robot (15) is also provided at a discharge end of the ingot casting device (14).

5. The system according to any one of claims 1 to 4, characterized in that: The slag aluminum catalytic separation mechanism (7) comprises a separator (701) and a catalyst stirring tank (702); the discharge port of the catalyst stirring tank (702) is connected to the feed port of the separator (701) through a catalyst feeding pipe (703) and a catalyst feeding pump (704); the feed port of the separator (701) is also connected to the discharge port of the aluminum ash bin (6) through a seventh feeding mechanism (Y7); the discharge port of the separator (701) is connected to the feed port of the second screening mechanism (8) through an eighth feeding mechanism (Y8); preferably, a screw feeder (705) is also provided between the separator (701) and the seventh feeding mechanism (Y7); Preferably, the slag-aluminum catalytic separation mechanism (7) includes a plurality of catalyst stirring tanks (702), and each catalyst stirring tank (702) is connected to the feed port of the separator (701) via an independent catalyst feeding pipe (703) and a catalyst feeding pump (704).

6. The system according to claim 5, characterized in that: The second screening mechanism (8) is a high-frequency vibrating screen; the sieve hole diameter of the second screening mechanism (8) is 1.5-5 mm; Preferably, a high-frequency screen feeding device (801) is also provided between the second screening mechanism (8) and the eighth feeding mechanism (Y8); the discharge port of the high-frequency screen feeding device (801) is connected to the feed port of the second screening mechanism (8) via a high-frequency screen feeding pipe (802) and a high-frequency screen feeding pump (803).

7. The system according to claim 5 or 6, characterized in that: The reaction mechanism (9) comprises an enhanced reaction stirring tank (901), an oxidation stirring tank (902) and a carbon dioxide regulating tank (903) which are sequentially connected in series; an ozone adding device (904) is provided on the oxidation stirring tank (902); and a carbon dioxide adding device (905) is provided on the carbon dioxide regulating tank (903); preferably, the reaction mechanism (9) comprises a plurality of enhanced reaction stirring tanks (901), and the plurality of enhanced reaction stirring tanks (901) are sequentially connected in series; Preferably, a circulating feed port and a circulating discharge port are also provided on the enhanced reaction stirring tank (901), and the circulating discharge port of the enhanced reaction stirring tank (901) is connected to the circulating discharge port of the enhanced reaction stirring tank (901) via an enhanced reaction circulation pump mechanism (906); and / or The oxidation stirring tank (902) is also provided with a circulation feed port and a circulation discharge port, and the circulation discharge port of the oxidation stirring tank (902) is connected to the circulation discharge port of the oxidation stirring tank (902) through an oxidation stirring circulation pump mechanism (907); and / or The carbon dioxide regulating tank (903) is also provided with a circulating feed inlet and a circulating discharge outlet, and the circulating discharge outlet of the carbon dioxide regulating tank (903) is connected to the circulating discharge outlet of the carbon dioxide regulating tank (903) via a carbon dioxide regulating circulating pump mechanism (908).

8. The system according to claim 7, characterized in that: The flocculation and sedimentation mechanism (10) comprises a sedimentation tank (1001) and a flocculant stirring tank (1002); the feed port of the sedimentation tank (1001) is connected to the feed port of the carbon dioxide adjustment tank (903) through a ninth feeding mechanism (Y9); the discharge port of the sedimentation tank (1001) is connected to the feed port of the filtering and drying mechanism (11) through a tenth feeding mechanism (Y10); the discharge port of the flocculant stirring tank (1002) is connected to the feed port of the sedimentation tank (1001) through a flocculant feeding pipe (1003) and a flocculant feeding pump (1004); preferably, a sedimentation feeding pump (1005) is also provided on the ninth feeding mechanism (Y9); Preferably, the flocculation and sedimentation mechanism (10) comprises a plurality of flocculant stirring tanks (1002), and each flocculant stirring tank (1002) is connected to the feed port of the sedimentation tank (1001) via an independent flocculant feeding pipe (1003) and a flocculant feeding pump (1004).

9. The system according to claim 8, characterized in that: The system also includes an inert gas protection unit, which includes an air compressor (16), a gas storage tank (17) and an inert gas preparation device (18) which are connected in series in sequence; the exhaust port of the inert gas preparation device (18) is independently connected to the air inlet of the separator (701), the air inlet of the second screening mechanism (8), the air inlet of the high-frequency screening device (801), the air inlet of the enhanced reaction stirring tank (901), the air inlet of the oxidation stirring tank (902), the air inlet of the carbon dioxide adjustment tank (903), and the air inlet of the sedimentation tank (1001) through gas pipelines; Preferably, the system further comprises an ammonia recovery unit (19), the air inlet of the ammonia recovery unit (19) being independently connected to the exhaust port of the separator (701), the exhaust port of the second screening mechanism (8), the exhaust port of the high-frequency screen feeding device (801), the exhaust port of the enhanced reaction stirring tank (901), the exhaust port of the oxidation stirring tank (902), the exhaust port of the carbon dioxide adjustment tank (903), and the exhaust port of the sedimentation tank (1001) through the air supply pipe cover.

10. The system according to claim 9, characterized in that: The filtering and drying mechanism (11) comprises a belt filter (1101), a drying machine (1102), a bucket elevator (1103) and a storage bin (1104) which are sequentially connected in series; the water inlet of the belt filter (1101) is connected to a clean water pump (1105) via a water inlet pipe, and the water outlet of the belt filter (1101) is connected to a concentrated brine pool (1106) via a drainage pipe; preferably, a water pump (1106) is further provided on one side of the concentrated brine pool (1106) A circulating water pool (1107) is provided, and the concentrated brine pool (1106) is connected to the circulating water pool (1107) via a filter membrane (1108); the circulating water pool (1107) is independently connected to the water inlet of the belt filter (1101), the water inlet of the flocculant stirring tank (1002), the water inlet of the second screening mechanism (8), and the water inlet of the catalyst stirring tank (702) via a circulating water pump (1109) and a plurality of circulating water pipes; Preferably, the system also includes a wet belt dust collector (20), the air inlet of the wet belt dust collector (20) is independently connected to the discharge end of the dryer (1102) and the discharge end of the storage bin (1104) through multiple dust suction pipes and multiple dust suction hoods, and the exhaust port of the wet belt dust collector (20) is connected to the chimney through an exhaust pipe.

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