Harmless treatment method of aluminum ash
By heating aluminum ash in a closed container and adding water vapor and oxygen, combined with curing agent and acid solution treatment, the environmental pollution and resource waste problems in the existing aluminum ash treatment methods are solved, and efficient recycling and harmless aluminum resources are achieved. .
Patent Information
- Application Number
- CN202411806373.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-02-14
AI Technical Summary
The existing harmless treatment methods for aluminum ash have problems of environmental pollution, resource waste and safety hazards, especially during acid leaching, alkali leaching and washing, which are prone to harmful gases and wastewater.
The aluminum ash is heated to ≥100°C in a closed container, water vapor and oxygen are added, curing agent is added, and after the reaction is completed, the solid is cooled, and then water-soluble solid is added, filtered and acidic solution is treated, and finally crystallized to obtain aluminum salt.
Through this method, the emissions of ammonia, phosphine and sulfur dioxide can be effectively reduced, production costs can be reduced, environmental pollution and resource waste can be avoided, and efficient recycling of aluminum resources can be achieved.
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of environmentally friendly treatment of aluminum ash, and specifically relates to a harmless treatment method for aluminum ash. Background Art
[0002] Aluminum ash is a solid hazardous waste that is inevitably generated during the production process of aluminum smelting and electrolytic aluminum enterprises. It contains rich aluminum resources. Effective recycling of aluminum resources and implementation of scientific harmless treatment will not only help significantly reduce the negative impact of aluminum ash on the environment, but also actively promote the recycling of aluminum resources. This measure not only has significant economic value, but also can greatly improve the social value of aluminum ash and resource utilization efficiency.
[0003] The composition of aluminum ash is quite complex, mainly including metallic aluminum, aluminum oxide (content up to 68% to 83%), aluminum nitride (AlN, content of about 8% to 12%), aluminum phosphide (AlP, content between 0.1% and 1%), and aluminum sulfide (Al2S3, content of about 1% to 2%). The presence of these components makes the treatment of aluminum ash particularly complicated.
[0004] At present, the industry mainly adopts acid leaching, alkali leaching and washing methods for the harmless treatment of aluminum ash.
[0005] The acid leaching method usually uses acidic solutions such as sulfuric acid and hydrochloric acid to treat aluminum ash. Its main purpose is to dissolve the metallic aluminum and oxides therein, thereby recovering aluminum or preparing aluminum salt solution. However, this method will produce wastewater containing salt and heavy metals during the treatment process, posing a potential risk of secondary pollution to the environment.
[0006] The alkali leaching method uses alkaline solutions such as sodium hydroxide to treat aluminum ash, aiming to dissolve aluminum and aluminum oxide and convert them into soluble aluminates. Although this method can achieve the recovery of aluminum resources to a certain extent, the large consumption of alkali has led to a significant increase in production costs.
[0007] The washing method is to use deionized water or clean water to leach aluminum ash to remove soluble salts and some nitrides. However, this method not only consumes a lot of water resources, but also produces a lot of wastewater, which brings environmental pressure and waste of resources.
[0008] What is more serious is that during the acid leaching, alkali leaching and washing process, the aluminum nitride in the aluminum ash will release a large amount of highly irritating ammonia (NH3) when it comes into contact with water. This gas is not only flammable and explosive, but also poses a serious threat to human health. At the same time, aluminum phosphide will release highly toxic and flammable phosphine (PH3) gas when it comes into contact with water, while aluminum sulfide will release harmful substances such as elemental sulfur (S) or sulfur dioxide (SO2) when it comes into contact with water.
[0009] Therefore, acid leaching, alkali leaching and washing methods all have obvious limitations when treating aluminum ash and need further optimization and improvement. Summary of the invention
[0010] In view of the deficiencies in the prior art, the present invention aims to provide a harmless treatment method for aluminum ash.
[0011] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:
[0012] A harmless treatment method for aluminum ash,
[0013] S1. Place the aluminum ash in a sealed container after drying, exhaust the air in the sealed container, and then heat the aluminum ash to a temperature of ≥100°C;
[0014] S2, maintaining the temperature in the sealed container ≥ 100°C, adding a curing agent into the sealed container, and stirring the aluminum ash; after the reaction is completed and cooled, a solid is obtained;
[0015] S3, adding water to the sealed container to dissolve the solid matter, then discharging and filtering the matter in the sealed container, dissolving the obtained filter residue in an acidic solution, and then crystallizing to obtain an aluminum salt;
[0016] The curing agent includes water vapor and oxygen.
[0017] In the present invention, aluminum nitride, aluminum phosphide and water can react as follows:
[0018] AlN+3H2O=Al(OH)3+NH3,
[0019] AlP+3H2O=Al(OH)3+PH3,
[0020] The generated phosphine (PH3) can be oxidized to phosphoric acid in the presence of oxygen:
[0021] 2PH3+3O2=2P2O5+3H2O,
[0022] The resulting phosphorus pentoxide (P2O5) can react with water to form phosphoric acid:
[0023] P2O5+3H2O=2H3PO4.
[0024] In the present invention, aluminum sulfide can undergo the following reaction under the conditions of high temperature and oxygen:
[0025] Al2S3+6H2O=2Al(OH)3+3H2S,
[0026] The generated hydrogen sulfide (H2S) can react as follows when in contact with oxygen under high temperature conditions:
[0027] 2H2S+3O2=2SO2+2H2O,
[0028] The generated sulfur dioxide (SO2) can react as follows when it comes into contact with water vapor:
[0029] SO2+H2O=H2SO3,
[0030] The generated sulfurous acid (H2SO3) can undergo the following reaction under high temperature conditions, aluminum oxide catalysis, and oxygen:
[0031] 2H2SO3+O2=2H2SO4.
[0032] In the present invention, the transformation process of phosphorus in aluminum phosphide and sulfur in aluminum sulfide is as follows:
[0033]
[0034] In the present invention, after cooling, ammonia is easily soluble in water in a humid environment, which can reduce the volatilization of ammonia.
[0035] In the present invention, by dissolving the solid matter with water, the soluble substances in the solid matter can be dissolved in water, and at the same time, the concentration of ammonia in water is greatly reduced, and ammonia can be relatively stably dissolved in water, thereby achieving absorption treatment of ammonia.
[0036] In the present invention, the generated phosphoric acid and sulfuric acid can combine with ammonia (NH3) to generate ammonium salts during the cooling process.
[0037] In the present invention, water enters the sealed container in the form of water vapor and the temperature of the aluminum ash is ≥100°C. The water vapor can slowly contact the aluminum ash, thereby slowing down the rate at which the aluminum ash reacts with water to release gas, which can prevent a large amount of NH3, PH3, and H2S from reacting too violently and exploding when encountering oxygen. At the same time, it can reduce the heat release rate of the reaction of NH3, PH3, and H2S with oxygen, which is beneficial to maintaining the temperature in the sealed container.
[0038] In the present invention, when the temperature of aluminum ash is ≥100°C, water, NH3, PH3, and H2S in a closed container can all be in a gaseous state, so that water, NH3, PH3, and H2S can evaporate from the aluminum ash, which is beneficial to the mutual reaction between water, NH3, PH3, H2S, and oxygen; at the same time, when the temperature of aluminum ash is ≥100°C, it can provide the temperature required for the reaction between water, NH3, PH3, H2S, and oxygen or increase the speed of the mutual reaction.
[0039] In the present invention, when water is added to the sealed container to dissolve the solid matter, the aqueous solution of ammonia gas dissolving in water is alkaline, and at this time, aluminum ions will precipitate in the form of aluminum hydroxide. In the subsequent filtration process, the aluminum ions will not be dissolved and lost.
[0040] Preferably, the amount of water molecules in the water vapor is n1, and the amount of water molecules in the aluminum ash is n 氮 +3n 磷 +2n 硫 =n2, n1≥n2.
[0041] Preferably, the amount of oxygen in the aluminum ash is n3, and 2n 磷 +1.5n 硫 =n4, n3≥n4.
[0042] Preferably, in step S1, the temperature of the aluminum ash is heated to 100°C to 170°C.
[0043] Preferably, in step S2, the temperature in the sealed container is maintained at 100°C to 170°C.
[0044] In the present invention, the temperature of the aluminum ash is ≤170° C., which can reduce the decomposition of phosphate and sulfate.
[0045] Preferably, in step S2, after the reaction is completed, the mixture is cooled to below 40° C. to obtain a solid.
[0046] In the present invention, when the temperature is cooled to below 40° C., the phosphoric acid and sulfuric acid generated are favorable to combine with ammonia to form ammonium salt.
[0047] In the present invention, the temperature after cooling after the reaction is completed is selected from one of 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, and 40°C.
[0048] In the present invention, the reaction is cooled to room temperature after completion.
[0049] Preferably, in step S3, the obtained filter residue is dissolved in an acidic solution, the pH of the solution is adjusted to ≤ 4.0, and then the aluminum salt is crystallized.
[0050] In the present invention, the solution pH is ≤4.0, and the aluminum, aluminum oxide, and aluminum hydroxide in the solid matter can all be converted into chloride ions and dissolved in the solution, which is beneficial to the full recovery of aluminum metal.
[0051] Preferably, the obtained filter residue is dissolved in an acidic solution, and then evaporated, concentrated, cooled and crystallized to obtain the aluminum salt.
[0052] Preferably, the acidic solution comprises sulfuric acid.
[0053] Strong organic acids such as formic acid, oxalic acid, trichloroacetic acid, etc. generally have low solubility when combined with aluminum ions; common inorganic strong acids include hydrochloric acid, sulfuric acid, and nitric acid. When low-concentration hydrochloric acid and nitric acid are used to treat the filter residue, the amount of liquid is large, which will lead to crystallization difficulties. When high-concentration hydrochloric acid and nitric acid are used to treat the filter residue, hydrochloric acid and nitric acid are easy to volatilize.
[0054] Preferably, the curing agent further comprises hydrochloric acid.
[0055] In the present invention, hydrochloric acid is a gas at a temperature ≥100°C. Compared with phosphoric acid and sulfuric acid, which are not easily volatile, hydrochloric acid gas can fully contact with ammonia gas during the cooling process, which is conducive to the combination of ammonia gas in the closed container into ammonium salt, thereby achieving the solidification of ammonia gas.
[0056] In the present invention, when the ammonia released by aluminum ash in contact with water exceeds the amount that the generated phosphoric acid and sulfuric acid can combine, hydrochloric acid can fully solidify the remaining ammonia.
[0057] In the present invention, the aluminum, aluminum oxide and aluminum hydroxide in the aluminum ash will consume part of the phosphoric acid and sulfuric acid, and the hydrochloric acid can make up for the consumption of the phosphoric acid and sulfuric acid.
[0058] Preferably, the amount of hydrochloric acid is n5, and the amount of aluminum ash is n 磷 , n5:n 磷 =(0.1~0.3):1.
[0059] Preferably, in step S1, the air in the sealed container is exhausted by introducing nitrogen or an inert gas into the sealed container.
[0060] In the present invention, the air in the sealed container is discharged by introducing nitrogen into the sealed container.
[0061] Preferably, in step S1, the aluminum ash is ground to 200 mesh, dried at 500° C. to 700° C. for 1 hour, and then placed in a sealed container.
[0062] In the present invention, at 500°C to 700°C, a small amount of volatile components, organic matter, and carbon in the aluminum ash will volatilize or decompose.
[0063] In the present invention, the drying temperature is selected from one of 500°C, 550°C, 600°C, 650°C and 750°C.
[0064] In the present invention, the drying temperature is specifically selected to be 600°C.
[0065] Compared with the prior art, the advantages of the present invention include:
[0066] (1) The present invention provides a harmless treatment method for aluminum ash, which releases nitrogen, phosphorus and sulfur elements in aluminum ash and converts them into ammonia, phosphoric acid and sulfuric acid respectively under the condition of temperature ≥100°C, and dissolves ammonia, phosphoric acid and sulfuric acid in water, thereby achieving the treatment of nitrogen, phosphorus and sulfur elements and reducing the emission of ammonia, phosphine and sulfur dioxide.
[0067] (2) The harmless treatment method of aluminum ash provided by the present invention does not require pickling and water washing processes and is low in cost. DETAILED DESCRIPTION
[0068] In order to enable those skilled in the art to understand the characteristics and effects of the present application, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used herein have the common meanings understood by those skilled in the art for the present application. In case of conflict, the definitions in this specification shall prevail.
[0069] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present application in any way, that is, the content of the present application can be implemented without being limited by any specific theory or mechanism.
[0070] As used herein, "this application" means "the present invention" or "the present disclosure".
[0071] The use of "one", "an", "a kind" or similar expressions to describe the components and technical features described in this application is merely for the convenience of expression and to provide a general meaning to the scope of this application. Therefore, such description should be understood to include one or at least one, and the singular also includes the plural, unless it is obvious that it refers to another meaning.
[0072] In this document, "or its combination" means "or any combination thereof", and "any one", "any one" means "any one", "any one" or "any one".
[0073] As used herein, the terms "comprises," "including," "having," "containing," or any other similar terms are open-ended transitional phrases that are intended to cover non-exclusive inclusions. For example, a composition or article containing multiple elements is not limited to the elements listed herein, but may also include other elements that are not explicitly listed but are generally inherent to the composition or article. In addition, unless otherwise expressly stated, the term "or" refers to an inclusive "or" rather than an exclusive "or." For example, any of the following situations satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist), A is false (or does not exist) and B is true (or exists), and both A and B are true (or exist). In addition, in this article, the terms "comprising", "including", "having", and "containing" should be interpreted as being specifically disclosed and simultaneously covering closed conjunctions such as "consisting of", "consisting of", and "the remainder is", as well as conjunctions such as "consisting essentially of", "mainly consisting of", "mainly consisting of", "basically containing", "essentially consisting of", "essentially consisting of", and "essentially containing".
[0074] In this article, all features or conditions such as numerical values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for simplicity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be deemed to have covered and specifically disclosed all possible sub-ranges and individual values within the range (including integers and fractions), especially integer values. For example, the range description of "1.0 to 8.0" or "between 1.0 and 8.0" or "between 1.0 and 8.0" should be deemed to have specifically disclosed all sub-ranges such as 1.0 to 8.0, 1.0 to 7.0, 2.0 to 8.0, 2.0 to 6.0, 3.0 to 6.0, 4.0 to 8.0, 3.0 to 8.0, etc., and should be deemed to cover endpoint values, especially sub-ranges defined by integer values, and should be deemed to have specifically disclosed individual values such as 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, etc. Unless otherwise indicated, the foregoing method of interpretation applies to all contents of the entire application, regardless of whether the scope is broad or not.
[0075] If the quantity, concentration or other numerical value or parameter is expressed as a range, a preferred range (or a better range) or a series of upper and lower limits, it should be understood that all ranges consisting of any pair of the upper limit or preferred value (or a better value) of the range and the lower limit or preferred value (or a better value) of the range have been specifically disclosed herein, regardless of whether these ranges are disclosed separately. In addition, if a numerical range is mentioned herein, unless otherwise specified, the range should include its endpoints and all integers and fractions within the range.
[0076] In this document, numerical values should be understood to have the accuracy of the number of significant digits of the numerical value, provided that the purpose of the invention can be achieved. For example, the number 40.0 should be understood to cover the range of 39.50 to 40.49.
[0077] Unless otherwise specified, in this application, parts by weight represent relative parts by weight in a composition, which may be any weight unit, such as but not limited to kilograms, kilograms, grams, pounds, etc. For example, 100 parts by weight of polyphenylene ether resin may represent 100 kilograms of polyphenylene ether resin or 100 pounds of polyphenylene ether resin.
[0078] It should be understood that the features disclosed in the various embodiments herein may be arbitrarily combined to form the technical solution of the present application, as long as there is no contradiction in the combination of these features.
[0079] The present application will be described below with specific implementations and examples. It should be understood that these specific implementations and examples are merely illustrative and are not intended to limit the scope of the present application and its use.
[0080] Unless otherwise stated, the methods, reagents and conditions used in the following preparation examples, comparative examples and examples are conventional methods, reagents and conditions in the art.
[0081] Preparation Example
[0082] Preparation Example 1
[0083] The raw materials used in this preparation example include: 100 kg of aluminum ash.
[0084] The preparation method of this preparation example includes:
[0085] The aluminum ash was ground into 200 meshes, and then placed in a calcining furnace and calcined at 600° C. for 1 hour, and then cooled to room temperature and sealed for storage to obtain pretreated aluminum ash.
[0086] The pretreated aluminum ash obtained in this preparation example has an aluminum oxide content of 72.44%, an aluminum nitride content of 10.27%, an aluminum phosphide content of 0.67%, an aluminum sulfide content of 1.69%, and an aluminum content of 47.4%.
[0087] Example
[0088] Example 1
[0089] The preparation method of this embodiment includes:
[0090] S1. Place 10 kg of the pretreated aluminum ash obtained in Preparation Example 1 in a closed reactor with a volume of 60 L, and then introduce nitrogen from the bottom of the reactor at a rate of 5 L / min for 15 min; then heat the reactor until the gas temperature in the reactor is 100° C., and slowly release the gas in the reactor during the process so that the gas pressure in the reactor is consistent with that in the outside;
[0091] S2, stirring the pretreated aluminum ash at a speed of 6 rpm, and then introducing a mixed gas of water vapor and oxygen into the reactor, the temperature of the mixed gas is 105°C, the humidity of the gas in the reactor is maintained at 20% to 25%, the oxygen concentration is 40% to 45%, and the gas temperature in the reactor is 100°C to 110°C; after the oxygen concentration in the reactor tends to be stable, stop heating and stop introducing the mixed gas, wait until the gas temperature in the reactor drops to room temperature, and obtain a solid;
[0092] S3.1. Pour 10L of water into the reactor and stir evenly, then let it stand for 3h, take out the substance in the reactor and filter it, and rinse the filter residue with deionized water during the filtration process; then dissolve the filter residue in 100L of sulfuric acid solution, and adjust the pH of the solution to 3.5-4.0 until the pH of the solution tends to be stable;
[0093] S3.2, filter the sulfuric acid solution, evaporate and concentrate it, cool and crystallize it to obtain aluminum sulfate.
[0094] Example 2
[0095] The difference between this embodiment and embodiment 1 is that in step S3.1, the pH of the solution is adjusted to 1.0-1.5.
[0096] Example 3
[0097] The preparation method of this embodiment includes:
[0098] S1. Place 10 kg of the pretreated aluminum ash obtained in Preparation Example 1 in a closed reactor with a volume of 60 L, and then introduce nitrogen from the bottom of the reactor at a rate of 5 L / min for 15 min; then heat the reactor until the gas temperature in the reactor is 130° C. During the process, slowly release the gas in the reactor so that the gas pressure in the reactor is consistent with that in the outside;
[0099] S2, stirring the pretreated aluminum ash at a speed of 6 rpm, then introducing a mixed gas of water vapor and oxygen into the reactor, the temperature of the mixed gas is 105°C, the humidity of the gas in the reactor is maintained at 20% to 25%, the oxygen concentration is 40% to 45%, and the gas temperature in the reactor is 125°C to 135°C; after the oxygen concentration in the reactor tends to be stable, stop heating and stop introducing the mixed gas, wait until the gas temperature in the reactor drops to room temperature, and obtain a solid;
[0100] S3.1. Pour 10L of water into the reactor and stir evenly, then let it stand for 3h, take out the substance in the reactor and filter it, and rinse the filter residue with deionized water during the filtration process; then dissolve the filter residue in 100L of sulfuric acid solution, and adjust the pH of the solution to 3.5-4.0 until the pH of the solution tends to be stable;
[0101] S3.2, filter the sulfuric acid solution, evaporate and concentrate it, cool and crystallize it to obtain aluminum sulfate.
[0102] Example 4
[0103] The preparation method of this embodiment includes:
[0104] S1. Place 10 kg of the pretreated aluminum ash obtained in Preparation Example 1 in a closed reactor with a volume of 60 L, and then introduce nitrogen from the bottom of the reactor at a rate of 5 L / min for 15 min; then heat the reactor until the gas temperature in the reactor is 100° C., and slowly release the gas in the reactor during the process so that the gas pressure in the reactor is consistent with that in the outside;
[0105] S2, stirring the pretreated aluminum ash at a speed of 6 rpm, and then introducing a mixed gas of water vapor, oxygen and hydrogen chloride into the reactor, the temperature of the mixed gas is 105°C, the humidity of the gas in the reactor is maintained at 20% to 25%, the oxygen concentration is 40% to 45%, the gas temperature in the reactor is 165°C to 170°C, and the concentration of hydrogen chloride in the reactor is 0.1% to 0.5%; after the oxygen concentration in the reactor tends to be stable, stop heating and stop introducing the mixed gas, wait until the gas temperature in the reactor drops to room temperature, and obtain a solid;
[0106] S3.1. Pour 10L of water into the reactor and stir evenly, then let it stand for 3h, take out the substance in the reactor and filter it, and rinse the filter residue with deionized water during the filtration process; then dissolve the filter residue in 100L of sulfuric acid solution, and adjust the pH of the solution to 3.5-4.0 until the pH of the solution tends to be stable;
[0107] S3.2, filter the sulfuric acid solution, evaporate and concentrate it, cool and crystallize it to obtain aluminum sulfate.
[0108] Results
[0109] (1) The filtrate obtained in step S3.1 of Examples 1 to 4 was tested for N, P, and S contents, and the N, P, and S conversion rates were calculated (unit: %);
[0110] (2) The aluminum sulfate obtained in Examples 1 to 4 was subjected to purity and quality tests, and the recovery rate was calculated (unit: %).
[0111] Table 1 Example 1-4 N, P, S conversion rate and recovery rate
[0112]
[0113]
[0114] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims
1. A harmless treatment method for aluminum ash, characterized in that: The steps include: S1. Place the aluminum ash in a sealed container after drying, exhaust the air in the sealed container, and then heat the aluminum ash to a temperature of ≥100°C; S2, maintaining the temperature in the sealed container ≥ 100°C, adding a curing agent into the sealed container, and stirring the aluminum ash; after the reaction is completed and cooled, a solid is obtained; S3, adding water to the sealed container to dissolve the solid matter, then discharging and filtering the matter in the sealed container, dissolving the obtained filter residue in an acidic solution, and then crystallizing to obtain an aluminum salt; The curing agent includes water vapor and oxygen.
2. The harmless treatment method of aluminum ash according to claim 1, characterized in that: The amount of water molecules in the water vapor is n1, and the amount of water molecules in the aluminum ash is n 氮 +3n 磷 +2n 硫 =n2, n1≥n2.
3. The harmless treatment method of aluminum ash according to claim 1 is characterized in that: The amount of oxygen in the aluminum ash is n3. 磷 +1.5n 硫 =n4, n3≥n4.
4. The harmless treatment method of aluminum ash according to claim 1, characterized in that: In the step S1, the temperature of the aluminum ash is heated to 100° C. to 170° C.; And / or, in step S2, the temperature in the sealed container is maintained at 100° C. to 170° C.; And / or, in step S2, after the reaction is completed, the mixture is cooled to below 40° C. to obtain a solid.
5. The harmless treatment method of aluminum ash according to claim 1, characterized in that: In step S3, the obtained filter residue is dissolved in an acidic solution, the pH of the solution is adjusted to ≤ 4.0, and then the aluminum salt is crystallized; And / or, the obtained filter residue is dissolved in an acidic solution, and then evaporated, concentrated, cooled and crystallized to obtain aluminum salt.
6. The harmless treatment method of aluminum ash according to claim 1, characterized in that: The acidic solution comprises sulfuric acid.
7. The harmless treatment method of aluminum ash according to claim 1, characterized in that: The curing agent also includes hydrochloric acid.
8. The harmless treatment method of aluminum ash according to claim 7, characterized in that: The amount of hydrochloric acid is n5, and the amount of aluminum ash is n 磷 , n5:n 磷 =(0.1~0.3):
1.
9. The harmless treatment method of aluminum ash according to claim 1, characterized in that: In the step S1, the air in the sealed container is exhausted by introducing nitrogen or an inert gas into the sealed container.
10. The harmless treatment method of aluminum ash according to claim 1, characterized in that: In the step S1, the aluminum ash is ground to 200 mesh, dried at 500° C. to 700° C. for 1 hour, and then placed in a sealed container.