CN116585651A - Denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash and preparation method thereof - Google Patents
Denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash and preparation method thereof Download PDFInfo
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- CN116585651A CN116585651A CN202310563152.1A CN202310563152A CN116585651A CN 116585651 A CN116585651 A CN 116585651A CN 202310563152 A CN202310563152 A CN 202310563152A CN 116585651 A CN116585651 A CN 116585651A
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Abstract
The invention discloses a denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash and a preparation method thereof, wherein the denitrification and fluorine fixing agent comprises, by weight, 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate, wherein the sodium carbonate comprises 10-30% of ultrafine powder and 70-90% of coarse powder. The denitrification fluorine fixing agent contains sodium carbonate with different particle sizes, wherein after the sodium carbonate coarse powder and aluminum ash are mixed and stirred, sodium carbonate is decomposed into sodium oxide at high temperature, the alkali ratio of a calcination system can be regulated by the sodium oxide, and as the content of aluminum oxide in the calcination process can be dynamically changed, the sodium oxide gradually decomposed by the sodium carbonate can be dynamically regulated; wherein the superfine sodium carbonate powder can permeate into the fine seams of the aluminum ash, and decompose at high temperature to generate CO 2 The gas can prevent the formation of an alumina film in the escaping process, so that ALN in the aluminum oxide film can fully react.
Description
Technical Field
The invention relates to the technical field of aluminum ash treatment processes, in particular to a denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash and a preparation method thereof.
Background
The secondary aluminum ash is the residue of the primary aluminum ash after recovering the metal aluminum, is usually in loose small particles or dust particles, and mainly consists of the metal aluminum and oxides thereof, aluminum nitride, aluminum carbide, other metal oxides, inorganic salts, electrolytes and the like. Due to the lack of low cost, large scale, relatively sophisticated disposal techniques, in situ landfill and stacking remains the primary treatment for secondary aluminum ash today. The ammonia gas with pungent smell is easily generated in the secondary aluminum ash in a humid environment, and the phenomenon that ammonia nitrogen is easily agglomerated when dissolved in water is one of the main reasons that the aluminum ash is listed as dangerous solid waste.
AIN in secondary aluminum ash exists mainly in the form of individual needles or large particle blocks. In general, the smaller the secondary aluminum ash particle size, the higher the AIN content. AIN has high reactivity, and can be oxidized to Al at high temperature besides ammonia gas released by reaction with water 2 0 3 . Leaching of soluble fluoride in secondary aluminum ash is another main reason that aluminum ash is listed as dangerous solid waste, and a calcination method of the conventional treatment process of the secondary aluminum ash is based on the principle that the secondary aluminum ash and calcium carbonate are used as raw materials for calcination. The aluminum oxide in the aluminum ash reacts with the additive to form calcium aluminate through calcination. Since the aluminum in the aluminum ash exists mainly in the form of aluminum oxide. And alumina is difficult to dissolve directly with lye. And the fluoride in the aluminum ash mainly uses NaF and Na 3 ALF 6 In the form of a gel. Both of these substances dissolve in the alkaline solution and adversely affect subsequent dissolution and decomposition of the alumina. Mixing and calcining aluminum ash and calcium carbonate. The calcium carbonate is decomposed into high-activity calcium oxide firstly, the calcium oxide is combined with the aluminum oxide to form calcium aluminate, and the aluminum oxide in the calcium aluminate can be dissolved out through alkali liquor. NaF and Na during calcination 3 ALF 6 Will also react with CaO to form CaF which is insoluble in water 2 Reduced fluorideInfluence on the alumina dissolution process.
Calcination has become a more mature process in secondary aluminum ash treatment, but the following problems are thrown away: first, in the high temperature calcination process, O in the atmosphere 2 alpha-Al generated by ALN surface contact reaction in secondary aluminum ash 2 O 3 Coating the surface of the particles with a film to form N 2 The desorption diffuses to the atmosphere, and the generated alumina film covers the particle surface to prevent the reaction from further occurring until the reaction stops, which can cause incomplete ALN reaction in the aluminum ash; second, caF 2 Although the solubility in water is very small, in a strongly alkaline environment, decomposition occurs, so that F ions are re-dissolved into the solution, and F enrichment in the solution is caused, so that a seed precipitation system, alumina granularity and the like are affected.
Disclosure of Invention
The invention aims to solve the problems that ALN reaction is incomplete and F ions are easy to dissolve back in the denitrification and fluorine fixation treatment of secondary aluminum ash in the prior art, and provides a denitrification and fluorine fixation agent for the comprehensive treatment of secondary aluminum ash and a preparation method thereof.
The invention solves the technical problems, and adopts the following technical scheme: the denitrogenation fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash consists of 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate by weight, wherein the sodium carbonate consists of 10-30% of ultrafine powder and 70-90% of coarse powder.
As a further optimization of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash, the invention: the sodium carbonate consists of 20-30% of ultrafine powder and 70-80% of coarse powder.
As a further optimization of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash, the invention: the denitrification and fluorine fixing agent consists of a denitrification and fluorine fixing agent A material and a denitrification and fluorine fixing agent B material which are packaged separately, wherein the denitrification and fluorine fixing agent A material is sodium carbonate superfine powder, and the denitrification and fluorine fixing agent B material is a mixture of calcium peroxide, kaolin and sodium carbonate coarse powder.
As a further optimization of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash, the invention: the particle size of the calcined soda superfine powder is 1-5 mu m.
As a further optimization of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash, the invention: the particle size of the calcined soda coarse powder is 0.15-0.25mm.
As a further optimization of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash, the invention: the particle size of the kaolin is 0.05-0.1mm.
As a further optimization of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash, the invention: the particle size of the calcium peroxide is 0.1-0.5mm.
The preparation method of denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash comprises the following steps of taking 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate according to the weight percentage, taking 10-30% of sodium carbonate raw material, and superfine grinding into superfine powder with the particle size of 1-5 mu m to be used as denitrification and fluorine fixing agent A material; mixing calcium peroxide, kaolin and the rest of sodium carbonate, and crushing to 50-100 meshes to obtain the material B of the denitrification and fluorine fixing agent.
The preparation method of denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash comprises the following steps of taking 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate according to the weight percentage, taking 10-30% of sodium carbonate raw material, and superfine grinding into superfine powder with the particle size of 1-5 mu m to be used as denitrification and fluorine fixing agent A material; pulverizing calcium peroxide to powder with particle size of 0.1-0.5mm, pulverizing kaolin to powder with particle size of 0.05-0.1mm, pulverizing the rest sodium carbonate to powder with particle size of 0.15-0.25mm, and mixing the above three powders uniformly to obtain the denitrification fluorine fixing agent B.
The preparation method of the denitrification fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash is further optimized: the kaolin powder is prepared by the following method: firstly, crushing kaolin to the particle size less than or equal to 2mm, transferring the crushed kaolin into a rotary drying furnace for drying, controlling the drying temperature to be 60-110 ℃, controlling the water content of the dried kaolin to be less than or equal to 5%, and finally, inputting the dried kaolin into a pulverizer for processing into kaolin powder with the particle size of 0.05-0.1mm.
The invention has the following beneficial effects:
1. the denitrification fluorine fixing agent contains calcium peroxide, and the calcium peroxide is decomposed at high temperature to generate calcium oxide and oxygen, wherein the calcium oxide can be combined with aluminumThe alumina in the ash is combined into calcium aluminate, and the alumina in the calcium aluminate can be dissolved out by alkali liquor. Meanwhile, the calcium ratio of a calcination system can be adjusted by generating calcium oxide, so that the calcium oxide, sodium fluoride and silicon dioxide react to generate sodium-fluorine conjugate NaF-2CaO-SiO 2 The combination is almost insoluble in water and alkali liquor, F ion liquid return can be avoided, and oxygen generated by decomposition can promote aluminum nitride in aluminum ash to be converted into aluminum oxide.
2. The denitrification fluorine fixing agent contains sodium carbonate with different particle sizes, wherein, after the sodium carbonate coarse powder and aluminum ash are mixed and stirred, sodium carbonate is decomposed into sodium oxide at high temperature, the sodium oxide can adjust the alkali ratio of a calcination system, and as the content of alumina in the calcination process can be dynamically changed, the sodium oxide gradually decomposed from the sodium carbonate can meet the alkali ratio dynamic adjustment of the calcination system, thereby being more beneficial to promoting sodium-fluorine combination NaF-2CaO-SiO 2 Is generated; at the same time, the sodium carbonate ultrafine powder can permeate into the fine seams of the aluminum ash and decompose at high temperature to generate CO 2 The gas can prevent the formation of an alumina film in the escaping process, so that ALN in the aluminum oxide film can fully react.
Detailed Description
For a better understanding of the present invention, the following examples are set forth to illustrate, but are not to be construed as limiting the invention.
< denitrification and fluorine fixing agent >
Consists of 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate by weight percent.
Wherein, the sodium carbonate consists of 10-30% of superfine powder and 70-90% of coarse powder. Further, the sodium carbonate consists of 20-30% of superfine powder and 70-80% of coarse powder.
When the denitrification and fluorine fixing agent is used, the denitrification and fluorine fixing agent is not completely mixed together, specifically, the denitrification and fluorine fixing agent consists of a denitrification and fluorine fixing agent A material and a denitrification and fluorine fixing agent B material which are packaged separately, wherein the denitrification and fluorine fixing agent A material is sodium carbonate ultrafine powder, and the denitrification and fluorine fixing agent B material is a mixture of calcium peroxide, kaolin and sodium carbonate coarse powder.
The particle size requirements of the raw materials are as follows: the particle size of the calcined soda superfine powder is 1-5 mu m. The particle size of the calcined soda coarse powder is 0.15-0.25mm. The particle size of the kaolin is 0.05-0.1mm. The particle size of the calcium peroxide is 0.1-0.5mm.
The particle sizes of the calcined soda coarse powder, the kaolin and the calcium peroxide powder are only suitable particle sizes, and can be adjusted in the actual use process. However, the particle size of the calcined soda ultrafine powder is important, and it is necessary to use the calcined soda ultrafine powder within the above-mentioned predetermined particle size.
< preparation method of Denitrification fluorine-fixing agent >
The following are two specific preparation methods of the denitrification and fluorine fixation agent of the invention, and the technical details are different:
the first method is as follows:
the preparation method of denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash comprises the following steps of taking 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate according to the weight percentage, taking 10-30% of sodium carbonate raw material, and superfine grinding into superfine powder with the particle size of 1-5 mu m to be used as denitrification and fluorine fixing agent A material; mixing calcium peroxide, kaolin and the rest of sodium carbonate, and crushing to 50-100 meshes to obtain the material B of the denitrification and fluorine fixing agent.
The second method is as follows:
the preparation method of denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash comprises the following steps of taking 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate according to the weight percentage, taking 10-30% of sodium carbonate raw material, and superfine grinding into superfine powder with the particle size of 1-5 mu m to be used as denitrification and fluorine fixing agent A material; pulverizing calcium peroxide to powder with particle size of 0.1-0.5mm, pulverizing kaolin to powder with particle size of 0.05-0.1mm, pulverizing the rest sodium carbonate to powder with particle size of 0.15-0.25mm, and mixing the above three powders uniformly to obtain the denitrification fluorine fixing agent B.
The kaolin powder is prepared by the following method: firstly, crushing kaolin to the particle size less than or equal to 2mm, transferring the crushed kaolin into a rotary drying furnace for drying, controlling the drying temperature to be 60-110 ℃, controlling the water content of the dried kaolin to be less than or equal to 5%, and finally, inputting the dried kaolin into a pulverizer for processing into kaolin powder with the particle size of 0.05-0.1mm.
< method for Using Denitrification fluorine fixing agent >
S1, aluminum ash component detection
Firstly, detecting the components of the aluminum ash to obtain the component data of the secondary aluminum ash to be treated, and then determining the weight ratio of each raw material in the denitrification and fluorine fixing agent according to the components in the secondary aluminum ash.
S2, batching
Mixing the secondary aluminum ash and the denitrification fluorine fixing agent according to the mass ratio of 100 (5-10) to obtain a mixture;
s3, mixing and grinding
Adding the mixed material into a ball mill, and fully grinding and crushing to obtain powder with the particle size of 100-200 meshes;
s4, high-temperature roasting
And (3) adding the powder after mixed grinding into a high-temperature furnace, roasting at 900-1300 ℃ for 1-3 hours in an oxidizing atmosphere, and cooling to room temperature after roasting is finished to obtain the calcined slag.
Example 1 ]
S1, aluminum ash component detection
Firstly, detecting the components of the aluminum ash to obtain the component data of the secondary aluminum ash to be treated, and then determining the weight ratio of each raw material in the denitrification and fluorine fixing agent according to the components in the secondary aluminum ash.
The weight percentage content of the main elements in the detected aluminum ash is as follows:
| element(s) | Al | N | 0 | Na | F | Si | Fe | Ca |
| Content of | 22.8％ | 6.8％ | 25.2％ | 7.2％ | 6.6％ | 1.2％ | 1.5％ | 0.2％ |
The main substances of the aluminum ash are aluminum oxide, aluminum nitride and MgAL 2 O 4 Aluminum, silicon dioxide and sodium chloride.
The composition of the denitrification fluorine fixing agent is determined as follows: 20% of calcium peroxide, 70% of kaolin and 10% of sodium carbonate, wherein the sodium carbonate consists of 30% of ultrafine powder and 70% of coarse powder.
S2, batching
Mixing the secondary aluminum ash and the denitrification fluorine fixing agent according to the mass ratio of 100:5 to obtain a mixture;
s3, mixing and grinding
Adding the mixed material into a ball mill, and fully grinding and crushing to obtain powder with the particle size of 200 meshes;
s4, high-temperature roasting
And (3) adding the powder after mixed grinding into a high-temperature furnace, roasting at the high temperature of 1100 ℃ in an oxidizing atmosphere for 2 hours, and cooling to room temperature after roasting is finished to obtain the calcined slag.
The components of the prepared roasting product are tested, the weight percentage content of N element in the detected aluminum ash is 0.12%, and the denitrification rate is calculated by the following method:
denitrification rate= (secondary aluminum ash nitrogen content-calcination slag nitrogen content)/secondary aluminum ash nitrogen content;
the calculated denitrification rate is 98.2 percent, and the method has better denitrification effect.
The calcination slag is dissolved by dilute alkali liquor, and the content of fluoride ions in the dissolved liquor is detected to be 16.7mg/L, which is lower than the concentration limit value of fluoride ions in GB5085.3-2007 standard of hazardous waste identification Standard Leaching toxicity identification, thus having excellent fluorine fixing effect.
Example 2 ]
S1, aluminum ash component detection
Firstly, detecting the components of the aluminum ash to obtain the component data of the secondary aluminum ash to be treated, and then determining the weight ratio of each raw material in the denitrification and fluorine fixing agent according to the components in the secondary aluminum ash.
The weight percentage content of the main elements in the detected aluminum ash is as follows:
| element(s) | Al | N | O | Na | F | Si | Fe | Ca |
| Content of | 43.2％ | 8.6％ | 28.5％ | 6.6％ | 3.6％ | 3.2％ | 0.8％ | 1.5％ |
The main substances of the aluminum ash are aluminum oxide, aluminum nitride and MgAL 2 O 4 Aluminum, silicon dioxide and sodium chloride.
The composition of the denitrification fluorine fixing agent is determined as follows: 25% of calcium peroxide, 55% of kaolin and 20% of sodium carbonate, wherein the sodium carbonate consists of 20% of ultrafine powder and 80% of coarse powder.
S2, batching
Mixing the secondary aluminum ash and the denitrification fluorine fixing agent according to the mass ratio of 100:10 to obtain a mixture;
s3, mixing and grinding
Adding the mixed material into a ball mill, and fully grinding and crushing to obtain powder with the particle size of 100 meshes;
s4, high-temperature roasting
And (3) adding the powder after mixed grinding into a high-temperature furnace, roasting at the high temperature of 1000 ℃ in an oxidizing atmosphere for 2.5 hours, and cooling to room temperature after roasting is finished to obtain the calcined slag.
The components of the prepared roasting product are tested, the weight percentage content of N element in the detected aluminum ash is 0.18%, and the denitrification rate is calculated by the following method:
denitrification rate= (secondary aluminum ash nitrogen content-calcination slag nitrogen content)/secondary aluminum ash nitrogen content;
the calculated denitrification rate is 97.9%, and the method has a good denitrification effect.
The calcination slag is dissolved by dilute alkali liquor, and the content of fluoride ions in the dissolved solution is detected to be 12.6mg/L, which is lower than the concentration limit value of fluoride ions in GB5085.3-2007 standard of hazardous waste identification Standard Leaching toxicity identification, thus having excellent fluorine fixing effect.
Example 3 ]
S1, aluminum ash component detection
Firstly, detecting the components of the aluminum ash to obtain the component data of the secondary aluminum ash to be treated, and then determining the weight ratio of each raw material in the denitrification and fluorine fixing agent according to the components in the secondary aluminum ash.
The weight percentage content of the main elements in the detected aluminum ash is as follows:
| element(s) | Al | N | O | Na | F | Si | Fe | Ca |
| Content of | 38.4％ | 7.3％ | 26.3％ | 3.2％ | 2.8％ | 2.2％ | 0.3％ | 0.8％ |
The main substances of the aluminum ash are aluminum oxide, aluminum nitride and MgAL 2 O 4 Aluminum, silicon dioxide and sodium chloride.
The composition of the denitrification fluorine fixing agent is determined as follows: 10% of calcium peroxide, 75% of kaolin and 15% of sodium carbonate, wherein the sodium carbonate consists of 10% of ultrafine powder and 90% of coarse powder.
S2, batching
Mixing the secondary aluminum ash and the denitrification fluorine fixing agent according to the mass ratio of 100:8 to obtain a mixture;
s3, mixing and grinding
Adding the mixed material into a ball mill, and fully grinding and crushing to obtain powder with the particle size of 150 meshes;
s4, high-temperature roasting
And (3) adding the powder after mixed grinding into a high-temperature furnace, roasting at 1300 ℃ for 2 hours in an oxidizing atmosphere, and cooling to room temperature after roasting is finished to obtain the calcined slag.
The components of the prepared roasting product are tested, the weight percentage content of N element in the detected aluminum ash is 0.08%, and the denitrification rate is calculated by the following method:
denitrification rate= (secondary aluminum ash nitrogen content-calcination slag nitrogen content)/secondary aluminum ash nitrogen content;
the calculated denitrification rate is 98.9%, and the method has a good denitrification effect.
The calcination slag is dissolved by dilute alkali liquor, and the content of fluoride ions in the dissolved solution is detected to be 12.5mg/L, which is lower than the concentration limit value of fluoride ions in GB5085.3-2007 standard of hazardous waste identification Standard Leaching toxicity identification, thus having excellent fluorine fixing effect.
Comparative example 1 ]
Taking the same batch of secondary aluminum ash in the embodiment 1, and determining the composition of the denitrification fluorine fixing agent as follows: 20% of calcium peroxide and 80% of kaolin.
S2, batching
Mixing the secondary aluminum ash and the denitrification fluorine fixing agent according to the mass ratio of 100:5 to obtain a mixture;
s3, mixing and grinding
Adding the mixed material into a ball mill, and fully grinding and crushing to obtain powder with the particle size of 200 meshes;
s4, high-temperature roasting
And (3) adding the powder after mixed grinding into a high-temperature furnace, roasting at the high temperature of 1100 ℃ in an oxidizing atmosphere for 2 hours, and cooling to room temperature after roasting is finished to obtain the calcined slag.
The components of the prepared roasting product are tested, the weight percentage content of N element in the detected aluminum ash is 0.35%, and the denitrification rate is calculated by the following method:
denitrification rate= (secondary aluminum ash nitrogen content-calcination slag nitrogen content)/secondary aluminum ash nitrogen content;
the denitrification rate is calculated to be 94.8%.
The calcination slag is dissolved by dilute alkali liquor, and the content of fluoride ions in the dissolved liquor is detected to be 46.8mg/L.
Comparative example 2 ]
Taking the same batch of secondary aluminum ash in the embodiment 1, and determining the composition of the denitrification fluorine fixing agent as follows: 20% of calcium peroxide, 70% of kaolin and 10% of sodium carbonate, wherein the sodium carbonate is coarse powder.
S2, batching
Mixing the secondary aluminum ash and the denitrification fluorine fixing agent according to the mass ratio of 100:5 to obtain a mixture;
s3, mixing and grinding
Adding the mixed material into a ball mill, and fully grinding and crushing to obtain powder with the particle size of 200 meshes;
s4, high-temperature roasting
And (3) adding the powder after mixed grinding into a high-temperature furnace, roasting at the high temperature of 1100 ℃ in an oxidizing atmosphere for 2 hours, and cooling to room temperature after roasting is finished to obtain the calcined slag.
The components of the prepared roasting product are tested, the weight percentage content of N element in the detected aluminum ash is 0.32%, and the denitrification rate is calculated by the following method:
denitrification rate= (secondary aluminum ash nitrogen content-calcination slag nitrogen content)/secondary aluminum ash nitrogen content;
the denitrification rate is calculated to be 95.2 percent.
And (3) carrying out dissolution treatment on the calcined slag by using dilute alkali liquor, and detecting the content of fluoride ions in the dissolution liquid to be 40.6mg/L.
Therefore, in the denitrification and fluorine fixing process of the secondary aluminum ash, when sodium carbonate is not added or sodium carbonate is added, the final denitrification rate is obviously reduced, the denitrification rate of the embodiment 1-3 is obviously higher than that of the case that sodium carbonate is not added or sodium carbonate is added, and the denitrification and fluorine fixing agent has no great difference compared with the dechlorination effect in the case that sodium carbonate is not added and sodium carbonate is added. The applicant speculates that this is due to the fact that the sodium carbonate ultra-fine powder can penetrate into the fine seams of the aluminum ash and decompose at high temperature to produce CO 2 The gas can prevent the formation of an alumina film in the escaping process, so that ALN in the gas can fully react, and finally a better denitrification effect can be obtained.
The content of fluorine ions in the alkali solution of the calcined slag in the examples 1-3 is lower than the concentration limit value of fluorine ions in the standard of GB5085.3-2007 hazardous waste identification Standard Leaching toxicity identification, and the calcined slag has excellent fluorine fixing effect. While the fluorine ion content in the alkali solution of the calcined slag in comparative examples 1 and 2 was significantly higher than in examples 1 to 3, the applicant speculates that this is due to the fact that F of the calcined slag in comparative examples 1 and 2 is mainly CaF 2 In the form of CaF 2 Although the solubility in water is very small, in a strong alkaline environment, the F ions can be decomposed to be re-dissolved into the solution, so that the F in the solution is enriched, and the seed precipitation system and the granularity of alumina are influencedEtc. By adding the calcium peroxide and the sodium carbonate, the dynamic adjustment of the alkali ratio and the calcium ratio reflected by the roasting in the roasting process is realized, and the F of the final roasting product mainly adopts NaF-2CaO-SiO 2 The denitrification and fluorine fixation agent of the invention contains calcium peroxide, which is decomposed at high temperature to generate calcium oxide and oxygen, wherein the calcium oxide can be combined with aluminum oxide in aluminum ash to form calcium aluminate, the aluminum oxide in the calcium aluminate can be dissolved out by alkali liquor, and simultaneously, the calcium ratio of a calcination system can be adjusted by the generation of the calcium oxide, so that the calcium oxide, sodium fluoride and silicon dioxide react to generate sodium fluoride combination NaF-2CaO-SiO 2 ) The conjugate is almost insoluble in water and alkali liquor, and F ion liquid return can be avoided.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (10)
1. A denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash is characterized in that: the composite material consists of calcium peroxide 5-25 wt%, kaolin 55-75 wt% and sodium carbonate 5-20 wt%, wherein the sodium carbonate consists of superfine powder 10-30 wt% and coarse powder 70-90 wt%.
2. The denitrification and fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash according to claim 1, which is characterized in that: the sodium carbonate consists of 20-30% of ultrafine powder and 70-80% of coarse powder.
3. The denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash according to claim 1 or 2, which is characterized in that: the denitrification and fluorine fixing agent comprises a denitrification and fluorine fixing agent A material and a denitrification and fluorine fixing agent B material which are packaged separately, wherein the denitrification and fluorine fixing agent A material is sodium carbonate ultrafine powder, and the denitrification and fluorine fixing agent B material is a mixture of calcium peroxide, kaolin and sodium carbonate coarse powder.
4. The denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash according to claim 1 or 2, which is characterized in that: the particle size of the calcined soda superfine powder is 1-5 mu m.
5. The denitrification and fluorine fixing agent for comprehensive treatment of secondary aluminum ash according to claim 1 or 2, which is characterized in that: the particle size of the calcined soda coarse powder is 0.15-0.25mm.
6. The denitrification and fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash according to claim 1, which is characterized in that: the particle size of the kaolin is 0.05-0.1mm.
7. The denitrification and fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash according to claim 1, which is characterized in that: the particle size of the calcium peroxide is 0.1-0.5mm.
8. A preparation method of a denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash is characterized by comprising the following steps: taking 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate according to the following weight percentage, and taking 10-30% of sodium carbonate raw material to be superfine-crushed into superfine powder with the particle size of 1-5 mu m to be used as a denitrification fluorine fixing agent A material; mixing calcium peroxide, kaolin and the rest of sodium carbonate, and crushing to 50-100 meshes to obtain the material B of the denitrification and fluorine fixing agent.
9. A preparation method of a denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash is characterized by comprising the following steps: taking 5-25% of calcium peroxide, 55-75% of kaolin and 5-20% of sodium carbonate according to the following weight percentage, and taking 10-30% of sodium carbonate raw material to be superfine-crushed into superfine powder with the particle size of 1-5 mu m to be used as a denitrification fluorine fixing agent A material; pulverizing calcium peroxide to powder with particle size of 0.1-0.5mm, pulverizing kaolin to powder with particle size of 0.05-0.1mm, pulverizing the rest sodium carbonate to powder with particle size of 0.15-0.25mm, and mixing the above three powders uniformly to obtain the denitrification fluorine fixing agent B.
10. The method for preparing the denitrification and fluorine fixing agent for the comprehensive treatment of the secondary aluminum ash according to claim 9, which is characterized in that: the kaolin powder is prepared by the following method: firstly, crushing kaolin to the particle size less than or equal to 2mm, transferring the crushed kaolin into a rotary drying furnace for drying, controlling the drying temperature to be 60-110 ℃, controlling the water content of the dried kaolin to be less than or equal to 5%, and finally, inputting the dried kaolin into a pulverizer for processing into kaolin powder with the particle size of 0.05-0.1mm.
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| CN202310563152.1A CN116585651A (en) | 2023-05-18 | 2023-05-18 | Denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash and preparation method thereof |
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| CN202310563152.1A CN116585651A (en) | 2023-05-18 | 2023-05-18 | Denitrification fluorine fixing agent for comprehensive treatment of secondary aluminum ash and preparation method thereof |
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