CN112939042A - Method and device for cooperatively treating and utilizing aluminum ash and silica fume - Google Patents
Method and device for cooperatively treating and utilizing aluminum ash and silica fume Download PDFInfo
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- CN112939042A CN112939042A CN202110130000.3A CN202110130000A CN112939042A CN 112939042 A CN112939042 A CN 112939042A CN 202110130000 A CN202110130000 A CN 202110130000A CN 112939042 A CN112939042 A CN 112939042A
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- aluminum ash
- powder
- silica fume
- limestone
- ash
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 73
- 229910021487 silica fume Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 65
- 235000019738 Limestone Nutrition 0.000 claims abstract description 51
- 239000006028 limestone Substances 0.000 claims abstract description 51
- 238000001354 calcination Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 230000002195 synergetic effect Effects 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 239000010703 silicon Substances 0.000 abstract description 7
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 238000003837 high-temperature calcination Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000701 toxic element Toxicity 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/164—Calcium aluminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/001—Calcining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/21—Attrition-index or crushing strength of granulates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method and a device for the cooperative treatment and utilization of aluminum ash and silica fume; respectively processing the aluminum ash and the limestone into aluminum ash powder and limestone powder, calcining the mixture of the aluminum ash powder, the limestone powder and the silica fume, and cooling and crushing the refined slag obtained by calcining. The invention processes the aluminum ash and the limestone into powder and then calcines the powder together with the silica fume, thereby not only simultaneously treating the aluminum ash and the silica fume, but also recycling most of aluminum in the aluminum ash, and adding the silica fume to ensure that the silicon content in the generated product calcium aluminate (the main component of refining slag) reaches the national standard, and simultaneously, the metal oxide impurities in the silica fume can play a role in combustion assistance in the high-temperature calcination process, thereby enhancing the mechanical strength of a calcined sample.
Description
Technical Field
The invention belongs to the technical field of electrolytic aluminum industrial waste residue treatment, and particularly relates to a method and a device for cooperatively treating and utilizing aluminum ash and silica fume.
Background
The aluminum ash slag is the main components of metallic aluminum and Al generated in the processes of production, use, recovery and the like of the aluminum industry such as electrolytic aluminum and the like2O3The solid matter of (2) aluminum ash is often considered as aluminum industry waste and is disposed of in landfills. However, the toxic elements such as selenium, arsenic, cadmium, chromium, lead and the like contained in the waste water can pollute soil and water, are listed as industrial solid dangerous wastes and need to be subjected to harmless treatment. At present in ChinaThe process for preparing calcium aluminate by calcining aluminum ash limestone is mature and widely used, but the content of silicon in the raw materials does not reach the national standard, and silicon needs to be added in the raw materials.
The silicon ash is a powder which is obtained by contacting, oxidizing, condensing and precipitating a large amount of silicon dioxide and silicon volatile gas generated in an ore-smelting electric furnace when ferrosilicon or metal silicon is smelted in ferrosilicon plants and metal plants, and then trapping and recovering the silicon dioxide through dust removal environment-friendly equipment, and the main component of the powder is silicon dioxide. The annual output of the silica fume is large, if the silica fume can not be reasonably utilized and is directly discharged into the atmosphere, serious atmospheric pollution can be caused, the other part is piled up in a large quantity to cause the pollution of the surrounding environment, meanwhile, the burden is also increased for enterprises, and resources are wasted. Therefore, the effective recovery and utilization of the silica fume are beneficial to improving the industrial added value, lightening the burden of enterprises and improving the air dust pollution quality.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for co-processing and utilizing aluminum ash and silica fume, which can simultaneously achieve harmless treatment and resource utilization of the aluminum ash and silica fume.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention discloses a method for cooperatively treating and utilizing aluminum ash and silica fume, which comprises the following steps:
(1) respectively processing the aluminum ash and the limestone into aluminum ash powder and limestone powder;
(2) mixing 39-45% of aluminum ash powder, 43-50% of limestone powder and 5-18% of silica fume, calcining the mixture, cooling the calcined refining slag and crushing.
As a preferable technical scheme, in the step (1), the aluminous ash and the limestone are respectively processed into aluminous ash powder and limestone powder by a crushing or/and ball milling method.
As a preferable technical scheme, in the step (1), the particle size of the aluminum ash powder is more than 80 meshes, and the particle size of the limestone powder is 5-30 cm.
In the preferable technical scheme, in the step (2), the aluminum ash powder, the limestone powder and the silica fume are mixed and then ground into a mixture with more than 100 meshes.
As a preferable technical scheme, in the step (2), the mixture passes through a preheating zone at 300-600 ℃, a calcining zone at 1100-1500 ℃ and a cooling zone at 300-600 ℃ in sequence during calcination, and the total process lasts for 2-5 hours.
The invention discloses a device for cooperatively treating and utilizing aluminum ash and silica fume, which comprises an aluminum ash pretreatment system, a limestone pretreatment system, an aluminum ash powder bin, a limestone powder bin, a silica ash bin, a batching and mixing system, a calcining system, a cooling system and a crushing and screening system, wherein the limestone powder bin is arranged on the aluminum ash pretreatment system; the aluminum ash pretreatment system is used for processing aluminum ash powder, the aluminum ash pretreatment system is connected with an aluminum ash powder bin, the limestone pretreatment system is used for processing limestone powder, and the limestone pretreatment system is connected with a limestone powder bin; the aluminum ash slag powder bin, the limestone powder bin and the silica fume bin are respectively connected with a batching and mixing system, the batching and mixing system is connected with a calcining system, the calcining system is connected with a cooling system, and the cooling system is connected with a crushing and screening system.
As the preferred technical scheme, batching and mixing system includes auger delivery electronic batching scale, ball mill and mixture material jar, auger delivery electronic batching scale is connected with aluminium ash powder feed bin, limestone powder feed bin and silica fume feed bin respectively, the ball mill is connected with auger delivery electronic batching scale, the mixture material jar is connected with the ball mill.
According to a preferable technical scheme, the calcining system comprises a rotary kiln, and the rotary kiln is divided into a preheating zone, a calcining zone and a cooling zone from feeding of a kiln tail to discharging of a kiln head.
The invention has the beneficial effects that:
the invention processes the aluminum ash and the limestone into powder and then calcines the powder together with the silica fume, thereby not only simultaneously treating the aluminum ash and the silica fume, but also recycling most of aluminum in the aluminum ash, and adding the silica fume to ensure that the silicon content in the generated product calcium aluminate (the main component of refining slag) reaches the national standard, and simultaneously, the metal oxide impurities in the silica fume can play a role in combustion assistance in the high-temperature calcination process, thereby enhancing the mechanical strength of a calcined sample.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
As shown in figure 1, the device for cooperatively treating and utilizing the aluminum ash and the silica fume comprises an aluminum ash pretreatment system, a limestone pretreatment system, an aluminum ash powder bin, a limestone powder bin, a silica fume bin, a batching and mixing system, a calcining system, a cooling system and a crushing and screening system.
The aluminum ash pretreatment system is used for processing aluminum ash powder, the aluminum ash pretreatment system is connected with the aluminum ash powder bin, the limestone pretreatment system is used for processing limestone powder, and the limestone pretreatment system is connected with the limestone powder bin.
The batching and mixing system comprises a spiral conveying electronic batching scale, a ball mill and a mixture tank, wherein the spiral conveying electronic batching scale is respectively connected with an aluminum ash powder bin, a limestone powder bin and a silica ash bin, the ball mill is connected with the spiral conveying electronic batching scale, and the mixture tank is connected with the ball mill.
The material mixing system is connected with the calcining system, the calcining system comprises a rotary kiln, and the rotary kiln is divided into a preheating zone, a calcining zone and a cooling zone from kiln tail feeding to kiln head discharging; the calcining system is connected with a cooling system, and the cooling system is connected with a crushing and screening system.
Due to different casting and refining processes, the composition and content of the aluminous ash and the silica fume produced by different enterprises are different.
Aluminous ash Al produced by certain enterprises2O3The content is more than or equal to 41.2 percent, and SiO is2The content is 0.92-3.56%, and the content of F is 0.95-1.05%; CaO content of limestone is about 51.47%, SiO2The content is about 2.54%; silica fume SiO2The content is 85-98%.
A method for utilizing aluminum ash and silica fume in a synergistic manner comprises the following steps:
1. the aluminum ash is ball-milled into aluminum ash powder with the particle size of more than 80 meshes by an aluminum ash pretreatment system, and the limestone is crushed and ball-milled into limestone powder with the particle size of 5-30cm by a limestone pretreatment system.
2. Mixing the aluminum ash powder, the limestone powder and the silica fume by an electronic scale according to the weight ratio of 39-45 percent of the aluminum ash powder, 43-50 percent of the limestone powder and 5-18 percent of the silica fume, and then ball-milling the mixture into a mixture with more than 100 meshes.
3. The mixture is driven into a kiln tail high-level tank by a screw fan, and then the mixture is put into a rotary kiln from the kiln tail of the rotary kiln by the screw fan to be calcined and sintered for 2 to 5 hours; the rotary kiln roasting is divided into a preheating zone (the temperature is increased from normal temperature to 500 ℃, and then gradually increased to about 1100 ℃), a calcining zone (the calcining temperature is controlled to about 1300 ℃) and a cooling zone (the temperature is cooled to 500 ℃) from the kiln tail feeding to the kiln head discharging.
4. And (3) cooling the refining slag (blocks) sintered in the rotary kiln in a cooling system from the kiln head of the rotary kiln, discharging the refining slag after the refining slag is cooled by the cooling system, wherein the discharging temperature is about 70 ℃, and crushing and screening the refining slag (blocks) to prepare a finished product.
Limestone (CaCO)3) Decomposing into calcium oxide at high temperature in the rotary kiln, and further reacting with alumina in the aluminous ash to generate calcium dialuminate (CaO 2 Al) as a main product2O3) And calcium monoaluminate (CaO. Al)2O3) And the silica fume is added to lead the produced product of calcium aluminate to contain SiO and Si2The content is more than 8 percent and reaches the national standard.
TABLE 1 national Standard GB/T30900-2014 of refining slag products
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. A method for utilizing aluminum ash and silica fume in a synergistic manner is characterized by comprising the following steps: the method comprises the following steps:
(1) respectively processing the aluminum ash and the limestone into aluminum ash powder and limestone powder;
(2) mixing 39-45% of aluminum ash powder, 43-50% of limestone powder and 5-18% of silica fume, calcining the mixture, cooling the calcined refining slag and crushing.
2. The aluminous ash and silica fume co-processing utilization method according to claim 1, characterized in that: in the step (1), the aluminum ash and the limestone are respectively processed into aluminum ash powder and limestone powder by a crushing or/and ball milling method.
3. The aluminous ash and silica fume co-processing utilization method according to claim 1, characterized in that: in the step (1), the particle size of the aluminum ash powder is more than 80 meshes, and the particle size of the limestone powder is 5-30 cm.
4. The aluminous ash and silica fume co-processing utilization method according to claim 1, characterized in that: in the step (2), the aluminum ash powder, the limestone powder and the silica fume are mixed and ground into a mixture with more than 100 meshes.
5. The aluminous ash and silica fume co-processing utilization method according to claim 1, characterized in that: in the step (2), the mixture passes through a preheating zone at 600 ℃ of 300-.
6. The utility model provides an aluminium ash sediment and silica fume coprocessing utilizes device which characterized in that: the system comprises an aluminum ash slag pretreatment system, a limestone pretreatment system, an aluminum ash slag powder bin, a limestone powder bin, a silica ash bin, a batching and mixing system, a calcining system, a cooling system and a crushing and screening system;
the aluminum ash pretreatment system is used for processing aluminum ash powder, the aluminum ash pretreatment system is connected with an aluminum ash powder bin, the limestone pretreatment system is used for processing limestone powder, and the limestone pretreatment system is connected with a limestone powder bin;
the aluminum ash slag powder bin, the limestone powder bin and the silica fume bin are respectively connected with a batching and mixing system, the batching and mixing system is connected with a calcining system, the calcining system is connected with a cooling system, and the cooling system is connected with a crushing and screening system.
7. The aluminum ash and silica fume cooperative processing and utilizing device as claimed in claim 6, wherein: the batching and mixing system comprises a spiral conveying electronic batching scale, a ball mill and a mixture tank, wherein the spiral conveying electronic batching scale is respectively connected with an aluminum ash powder bin, a limestone powder bin and a silica ash bin, the ball mill is connected with the spiral conveying electronic batching scale, and the mixture tank is connected with the ball mill.
8. The aluminum ash and silica fume cooperative processing and utilizing device as claimed in claim 6, wherein: the calcining system comprises a rotary kiln, and the rotary kiln is divided into a preheating zone, a calcining zone and a cooling zone from kiln tail feeding to kiln head discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110130000.3A CN112939042A (en) | 2021-01-29 | 2021-01-29 | Method and device for cooperatively treating and utilizing aluminum ash and silica fume |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110130000.3A CN112939042A (en) | 2021-01-29 | 2021-01-29 | Method and device for cooperatively treating and utilizing aluminum ash and silica fume |
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| Publication Number | Publication Date |
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| CN112939042A true CN112939042A (en) | 2021-06-11 |
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| CN202110130000.3A Pending CN112939042A (en) | 2021-01-29 | 2021-01-29 | Method and device for cooperatively treating and utilizing aluminum ash and silica fume |
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| CN (1) | CN112939042A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286026A (en) * | 2022-07-20 | 2022-11-04 | 华润水泥技术研发（广西）有限公司 | Preparation method of water purifying agent raw material |
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| CN115286026A (en) * | 2022-07-20 | 2022-11-04 | 华润水泥技术研发（广西）有限公司 | Preparation method of water purifying agent raw material |
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