CN114733615B - Processing method and processing system of aluminum powder paste - Google Patents
Processing method and processing system of aluminum powder paste Download PDFInfo
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- CN114733615B CN114733615B CN202210319360.2A CN202210319360A CN114733615B CN 114733615 B CN114733615 B CN 114733615B CN 202210319360 A CN202210319360 A CN 202210319360A CN 114733615 B CN114733615 B CN 114733615B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 213
- 238000012545 processing Methods 0.000 title claims abstract description 18
- 238000003672 processing method Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 152
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 116
- 239000002994 raw material Substances 0.000 claims abstract description 44
- 238000000498 ball milling Methods 0.000 claims abstract description 34
- 239000004567 concrete Substances 0.000 claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 62
- 229910052757 nitrogen Inorganic materials 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 19
- 239000000843 powder Substances 0.000 description 17
- 238000003756 stirring Methods 0.000 description 15
- 239000004744 fabric Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000002156 mixing Methods 0.000 description 9
- 239000002956 ash Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000011449 brick Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000008117 stearic acid Substances 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/186—Adding fluid, other than for crushing by fluid energy
- B02C17/1865—Adding fluid, other than for crushing by fluid energy after crushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/06—Selection or use of additives to aid disintegrating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/02—Elements
- C04B22/04—Metals, e.g. aluminium used as blowing agent
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a processing method and a processing system of aluminum powder paste, wherein the processing method comprises the following steps: adding aluminum powder raw materials and ball milling auxiliary agents into a ball mill for ball milling, then sending the ball milling raw materials and the ball milling auxiliary agents into a centrifugal separator for centrifugal separation, separating flaky aluminum particles and thick flaky aluminum particles, sending the flaky aluminum particles into a cyclone separator for cyclone separation, further separating flaky aluminum particles with small particle size and flaky aluminum particles with large particle size, sending the flaky aluminum particles with small particle size into a bag type collector for bag collection, and respectively coating the flaky aluminum particles with small particle size and the flaky aluminum particles with large particle size, which are collected from the bag type collector, with the aqueous auxiliary agents to obtain the aluminum powder paste. According to the processing method of the aluminum powder paste, the obtained aluminum powder paste is used as a gas generating agent to generate gas uniformly and has proper gas generation amount in concrete, so that the finally obtained aerated concrete block has higher porosity and uniform porous structure.
Description
Technical Field
The invention relates to the field of new concrete materials, in particular to a processing method and a processing system of aluminum powder paste.
Background
Autoclaved aerated concrete is a porous lightweight concrete, which is prepared from siliceous materials (such as fly ash, sand and the like) and calcareous materials (such as lime, cement) as main raw materials, and a gas generating agent through the processes of proportioning casting, gas generation expansion, cutting maintenance and the like. The autoclaved aerated concrete block has a unit volume weight of one third of that of a clay brick, a heat insulation performance of 3-4 times of that of the clay brick, a sound insulation performance of 2 times of that of the clay brick, an impervious performance of more than one time of that of the clay brick and a fire resistance of 6-8 times of that of reinforced concrete.
At present, the aerated concrete block production has a technical problem which is difficult to solve, the air-filling block collapse rate is higher, the air-filling block qualification rate is about 80%, and the main reasons for the collapse are that the existing aluminum powder paste has poor air-generating effect and nonuniform air-generating when being used as an air-generating agent.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a processing method of aluminum powder paste, and the obtained aluminum powder paste is used as a gas generating agent to generate gas uniformly and has proper gas generation amount in concrete, so that the finally obtained aerated concrete block has higher porosity and uniform porous structure.
The invention provides a processing method of aluminum powder paste, which comprises the following steps: adding aluminum powder raw materials and ball milling auxiliary agents into a ball mill for ball milling, then sending the ball milling raw materials and the ball milling auxiliary agents into a centrifugal separator for centrifugal separation, separating flaky aluminum particles and thick flaky aluminum particles, sending the flaky aluminum particles into a cyclone separator for cyclone separation, further separating flaky aluminum particles with small particle size and flaky aluminum particles with large particle size, sending the flaky aluminum particles with small particle size into a bag type collector for bag collection, and respectively coating the flaky aluminum particles with small particle size and the flaky aluminum particles with large particle size, which are collected from the bag type collector, with the aqueous auxiliary agents to obtain the aluminum powder paste.
Preferably, the thick plate-like aluminum particles separated from the centrifugal separator are returned to the ball mill for ball milling again.
Preferably, inert gas is introduced as protective gas in the working process of the ball mill, the centrifugal separator, the cyclone separator and the bag collector;
preferably, the inert gas is nitrogen.
Preferably, the particle diameter D50 of the flaky aluminum particles collected from the pocket collector is not more than 20 μm, and the particle diameter D50 of the flaky aluminum particles collected from the cyclone separator is not more than 35 μm.
Preferably, the aluminum powder raw material is at least one of aluminum powder, aluminum ash, aluminum slag or aluminum foil.
Preferably, the ball milling auxiliary agent is a silane coupling agent KH-550;
Preferably, the addition amount of the silane coupling agent KH-550 is 1-5wt% of the aluminum powder raw material.
Preferably, the aqueous auxiliary comprises ethyl orthosilicate, ammonia water, polyethylene glycol and water;
Preferably, the addition amount of the tetraethoxysilane is 7-15wt% of the aluminum powder raw material, the addition amount of the ammonia water is 1-5wt% of the aluminum powder raw material, the addition amount of the polyethylene glycol is 3-7wt% of the aluminum powder raw material, and the addition amount of the water is 2-4 times of the weight of the aluminum powder raw material;
preferably, the polyethylene glycol has a molecular weight of 200-2000.
Preferably, a processing system of aluminum paste comprises: a ball mill 2, a centrifugal separator 3, a cyclone separator 4, a bag collector 5, a first buffer tank 6 and a second buffer tank 7;
The discharge gate of ball mill 2 links to each other with the feed inlet of centrifugal separator 3, and the first discharge gate of centrifugal separator 3 links to each other with the feed inlet of cyclone 4, and the second discharge gate of centrifugal separator 3 links to each other with the feed inlet of ball mill 2, and the first discharge gate of cyclone 4 links to each other with the feed inlet of pocket type collector 5, and the second discharge gate of cyclone 4 links to each other with the feed inlet of first buffer tank 6, and the discharge gate of pocket type collector 5 links to each other with the feed inlet of second buffer tank 7.
Preferably, the processing system of the aluminum paste further comprises a high-pressure fan (10);
The air outlet of the high-pressure fan 10 is connected with the ball mill 2, and the air inlet of the high-pressure fan 10 is connected with the air outlet of the bag collector 5;
Preferably, the processing system of the aluminum powder paste further comprises a feeder 1, a first stirrer 8 and a second stirrer 9;
The discharge gate of feeder 1 links to each other with the feed inlet of ball mill 2, and the feed inlet of first mixer 8 links to each other with the discharge gate of first buffer tank 6, and the feed inlet of second mixer 9 links to each other with the discharge gate of second buffer tank 7.
In the invention, a feeder consists of a feeding tank, a feeder, a pneumatic valve and a nitrogen pulse tube, a raw material container filled with materials is arranged above the feeder, and the feeder is provided with two feeding and discharging pneumatic valves; when feeding, firstly, a feeding valve of a feeding tank is opened, after the materials are filled up, a nitrogen pulse valve is opened to stir the materials, after the materials are uniformly stirred, a discharging pneumatic valve and a motor switch of a feeder are opened, and the materials are added into a system at a constant speed through the feeder; in the normal production process, in order to ensure continuous and stable production, the nitrogen pulse tube on the charging tank is started to stir raw materials in a fixed interval time.
The ball mill is composed of a motor, a ball mill shell, abrasive materials and a cooling system, the ball mill rotates under the drive of the motor, the abrasive materials in the ball mill also rotate, at the moment, aluminum powder raw materials entering from an inlet of the ball mill are enabled to be sheet-shaped powder under the rolling force of the abrasive materials, the sheet-shaped powder is conveyed to the next working procedure under the influence of high-speed nitrogen, and heat generated by ball milling is cooled by the cooling system; the flakes are affected by the rising nitrogen stream and move with the stream to a centrifugal separator located above the ball mill.
The centrifugal separator mainly comprises a motor, a classifying shell and a classifying wheel, wherein the motor drives the classifying wheel to rotate in the classifying shell at high speed (the rotating speed can be adjusted at random), and a strong centrifugal force is formed in the classifying shell; under the action of centrifugal force, the gas-powder mixture entering the classifying shell is subjected to large centrifugal force, so that the large or heavy particles are thrown to the side wall and are not influenced by the centrifugal force any more, and naturally fall to the bottom of the centrifugal separator to return to the ball mill again; the small or light materials are little influenced by centrifugal force and hover in the classifying wheel, and the materials meeting the requirements are influenced by the wind force induced by the high-pressure fan and enter the next component to be separated or collected through the gap of the classifying wheel; the centrifugal force in the centrifugal separator can be adjusted by adjusting the rotating speed of the classifying wheel, so that the aim of classifying materials with different granularity sections is fulfilled.
The device is a separator without power and moving parts, and when materials pass through a spiral pipeline above the separator, coarse or heavy materials naturally fall to the bottom of the cyclone separator under the action of the gravity of the materials, and enter a buffer tank to be stirred; when the fine or light materials pass through the cyclone separator, the fine or light materials are forced to be pulled by airflow while naturally falling down, and enter the next component along the pipeline to carry out the next flow.
After the materials or tailings in the finest granularity section enter a bag collector after being collected by a cyclone separator, the flaky powder is adsorbed on a cloth bag, the flaky powder is pumped into a buffer tank to be stirred by nitrogen pulse pumping, and the nitrogen is conveyed to an inlet and an outlet of a ball mill for continuous recycling under the attraction of a high-speed fan.
The stirrer consists of a motor, an impeller and a stirring shell, flaky powder in a buffer tank is added into the stirrer, a certain proportion of relevant auxiliary agents are added, the impeller of the motor is started to start rotating, the flaky powder and the auxiliary agents are fully stirred uniformly to obtain aluminum powder paste, the stirrer is stopped, a discharge port valve is opened, and the aluminum powder paste is packaged.
When the system works, partial nitrogen is consumed by replacing oxygen-containing air of the feeding and discharging device, and the consumed nitrogen in the two processes cannot be recovered, so that the nitrogen is required to be continuously supplemented when the system works; the work of supplementing nitrogen is automatically controlled and completed by a matched oxygen content tester, a nitrogen supplementing device and an air compressor unit; the whole system is matched with an oxygen content test point and a nitrogen supplementing point at a plurality of positions, so that the purity of the nitrogen in the system is stabilized within a relative value, the nitrogen is quickly and timely supplemented, and the processing safety of materials is ensured.
An air generating agent is aluminum powder paste obtained by the processing method.
An aerated concrete comprising the aerated concrete formulation described above.
Compared with the prior art, the method has the following advantages and positive effects:
(1) According to the processing method of the aluminum powder paste, aluminum powder raw materials are ball-milled through a ball mill to obtain flaky powder, the flaky powder is graded through a centrifugal separator, thick flaky aluminum particles separated out enter the ball mill from the bottom of the centrifugal separator and ball-milled again, the flaky aluminum particles separated out are conveyed to a cyclone separator from an outlet above the centrifugal separator, the flaky aluminum particles are further graded through the cyclone separator, flaky aluminum particles with large particle size enter a corresponding buffer tank to finish collection, flaky aluminum particles with small particle size are conveyed to a bag collector from an outlet above the cyclone separator, the bag collector consists of a plurality of cloth bag type filter bags, when a mixture of flaky aluminum particles with small particle size and nitrogen passes through the filter bags, the flaky aluminum particles adsorbed on the filter bags are absorbed on the filter bags, the flaky aluminum particles adsorbed on the filter bags are vibrated down through nitrogen pulse impact, enter the corresponding buffer tank to finish collection, and finally the flaky aluminum particles with small particle size separated out of the bag type collector and the flaky aluminum particles with large particle size separated out of the cyclone separator are respectively mixed with an aqueous auxiliary agent to obtain the aluminum paste. The process can be suitable for the production of aluminum powder paste of different raw materials such as aluminum powder, aluminum foil, aluminum ash/slag and the like, and simultaneously can realize the continuous production and processing of the aluminum powder paste, finally process the product meeting the quality requirements of different clients, ensure the continuous stability of the product quality and store for a long time.
(2) In the processing method of the aluminum powder paste, the silane coupling agent KH-550 is adopted to modify the surface of the aluminum powder, so that on one hand, the effects of dispersing, grinding assisting and surface oxidation preventing are achieved, on the other hand, the silane coupling agent KH-550 is utilized to carry out grafting reaction on the aluminum powder, so that the surface of the aluminum powder is grafted with amino-containing alkyl active groups, then ethyl orthosilicate is added, the amino-containing alkyl active groups can be used as template agents to help the ethyl orthosilicate to form silicon dioxide nearby the ethyl orthosilicate, and finally, a silicon dioxide film layer coated on the aluminum powder is formed, on the one hand, excellent water dispersion performance is endowed to the aluminum powder, and the situation that the aluminum powder coated by stearic acid is unevenly dispersed in cement in the prior art is prevented, so that the gas generating effect is poor; on the other hand, the contact surface area of the aluminum powder and the slurry can be reduced, the stirring time of the aluminum powder in the slurry is prolonged, the aluminum powder is uniformly dispersed in the slurry as much as possible through longer stirring, and when the aerated concrete block is finally used as an air generating agent, the aerated concrete block has very high porosity and uniform porous structure, and the strength of the block is greatly improved.
Drawings
Fig. 1 is a schematic diagram of a system for processing aluminum paste according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is described in detail through specific embodiments.
Examples
The embodiment provides a processing method of aluminum powder paste, which comprises the following steps:
adding aluminum powder raw materials comprising aluminum powder and aluminum ash into a ball mill for ball milling, wherein the frequency of the ball mill is 40HZ, adding a silane coupling agent KH-550, wherein the adding amount of the silane coupling agent KH-550 is 3wt% of the aluminum powder raw materials, introducing nitrogen into the ball mill as a protective gas, and controlling the oxygen content within the range of 4.5-5.5%;
Delivering the flaky aluminum particle powder subjected to ball milling of the ball mill into a centrifugal separator by using a blower for centrifugal separation, delivering flaky aluminum particles output from an outlet above the centrifugal separator into a cyclone separator for cyclone separation, delivering thick flaky aluminum particles output from an outlet below the centrifugal separator back into a ball mill for continuous ball milling, wherein the frequency of the cyclone separator is 15 HZ;
After the flaky aluminum particles are subjected to cyclone separation in the cyclone separator, the flaky aluminum particles with small particle size output from an outlet above the cyclone separator are sent into a cloth bag type collector for cloth bag separation, other flaky aluminum particles with large particle size are output from an outlet below the cyclone separator, and flaky aluminum particles with large particle size output from an outlet below the cyclone separator are collected (D50 is not more than 35 mu m);
The flaky aluminum particles with small particle size pass through a filter bag in a bag-type collector, the flaky aluminum particles with small particle size are adsorbed on the filter bag and separated from nitrogen, the flaky aluminum particles with small particle size adsorbed on the filter bag are shaken off by nitrogen pulse impact and output from a lower outlet, and the flaky aluminum particles with small particle size output from the lower outlet of the bag-type collector are collected (D50 is not more than 20 mu m);
and (3) stirring and mixing flaky aluminum particles with small particle sizes, which are output from an outlet below a bag collector, with ethyl orthosilicate, ammonia water, polyethylene glycol (with a molecular weight of 1000) and water respectively, wherein the addition amount of the ethyl orthosilicate is 11wt% of the aluminum powder raw material, the addition amount of the ammonia water is 3wt% of the aluminum powder raw material, the ammonia water is ammonia water with a mass fraction of 25-28%, the addition amount of the polyethylene glycol is 5wt% of the aluminum powder raw material, the addition amount of the water is 3 times of the weight of the aluminum powder raw material, and stirring and mixing for 10 hours to obtain the aluminum powder paste.
Referring to fig. 1, in accordance with the above processing method, this embodiment provides a processing system for aluminum paste, including:
A feeder 1 for receiving, storing and stirring aluminum powder raw materials and ball milling auxiliaries of aluminum powder and aluminum ash, wherein the aluminum powder raw materials and the ball milling auxiliaries are constantly conveyed from the feeder 1 to a ball mill 2;
The ball mill 2 is connected with the feeder 1 through a conveying pipe and is used for ball milling of aluminum powder raw materials and ball milling auxiliaries to obtain flaky particle powder, and the flaky particle powder is constantly conveyed from the ball mill 2 to the centrifugal separator 3;
The centrifugal separator 3 is connected with the ball mill 2 through a conveying pipe and is used for centrifugally separating flaky particle powder to separate flaky aluminum particles and thick flaky aluminum particles, an outlet below the thick flaky aluminum particle centrifugal separator 3 is conveyed back to the ball mill 2 for ball milling again, and the flaky aluminum particles are constantly conveyed to the cyclone separator 4 from an outlet above the centrifugal separator 3;
The cyclone separator 4 is connected with the centrifugal separator 3 through a conveying pipe and is used for carrying out cyclone separation on the flaky aluminum particles conveyed by the centrifugal separator 3, flaky aluminum particles with small particle sizes and flaky aluminum particles with large particle sizes are separated, the flaky aluminum particles with large particle sizes enter the first buffer tank 6 from an outlet below the cyclone separator 4, and the flaky aluminum particles with small particle sizes are constantly conveyed to the cloth bag type collector 5 from an outlet above the cyclone separator 4;
The cloth bag collector 5 is connected with the high-pressure fan 10 through a conveying pipe and is used for separating aluminum particles from nitrogen gas from flaky aluminum particles with small particle sizes conveyed by the cyclone separator 4, the cloth bag collector 5 is composed of a plurality of cloth bag type filter bags, when aluminum particles and nitrogen gas mixture pass through the filter bags, the aluminum particles are adsorbed on the filter bags, the aluminum particles are beaten down through nitrogen gas pulse, the aluminum particles enter the second buffer tank 7 from an outlet below the cloth bag collector 5, and the filtered nitrogen gas is constantly conveyed to the high-pressure fan 10;
the high-pressure fan 10 is connected with the ball mill 2 through a gas pipe and is used for conveying the filtered nitrogen to an inlet and an outlet of the ball mill 2 through the gas pipe for recycling;
The first stirrer 8 is connected with the first buffer tank 6 and is used for fully mixing flaky aluminum particles with large particle sizes and the aqueous auxiliary agent conveyed from the first buffer tank 6 to obtain aluminum powder paste A;
and a second stirrer 9 connected to the second buffer tank 7 for sufficiently mixing the flaky aluminum particles having a small particle diameter and transferred from the second buffer tank 7 with the aqueous auxiliary agent to obtain aluminum powder paste B.
Comparative example 1
The embodiment provides a processing method of aluminum powder paste, which comprises the following steps:
adding aluminum powder raw materials comprising aluminum powder and aluminum ash into a ball mill for ball milling, wherein the frequency of the ball mill is 40HZ, adding stearic acid, the addition amount of the stearic acid is 3wt% of the aluminum powder raw materials, introducing nitrogen into the ball mill as protective gas, and controlling the oxygen content within the range of 4.5-5.5%;
Delivering the flaky aluminum particle powder subjected to ball milling of the ball mill into a centrifugal separator by using a blower for centrifugal separation, delivering flaky aluminum particles output from an outlet above the centrifugal separator into a cyclone separator for cyclone separation, delivering thick flaky aluminum particles output from an outlet below the centrifugal separator back into a ball mill for continuous ball milling, wherein the frequency of the cyclone separator is 15 HZ;
After the flaky aluminum particles are subjected to cyclone separation in the cyclone separator, the flaky aluminum particles with small particle size output from an outlet above the cyclone separator are sent into a cloth bag type collector for cloth bag separation, other flaky aluminum particles with large particle size are output from an outlet below the cyclone separator, and flaky aluminum particles with large particle size output from an outlet below the cyclone separator are collected (D50 is not more than 35 mu m);
The flaky aluminum particles with small particle size pass through a filter bag in a bag-type collector, the flaky aluminum particles with small particle size are adsorbed on the filter bag and separated from nitrogen, the flaky aluminum particles with small particle size adsorbed on the filter bag are shaken off by nitrogen pulse impact and output from a lower outlet, and the flaky aluminum particles with small particle size output from the lower outlet of the bag-type collector are collected (D50 is not more than 20 mu m);
And (3) stirring and mixing flaky aluminum particles with small particle sizes, which are output from an outlet below a bag collector, with diethylene glycol, polyethylene glycol (molecular weight 1000) and water respectively, wherein the addition amount of the diethylene glycol is 5wt% of the aluminum powder raw material, the addition amount of the polyethylene glycol is 5wt% of the aluminum powder raw material, and the addition amount of the water is 3 times of the weight of the aluminum powder raw material, and stirring and mixing for 10 hours to obtain the aluminum powder paste.
Comparative example 2
The embodiment provides a processing method of aluminum powder paste, which comprises the following steps:
Adding aluminum powder raw materials comprising aluminum powder and aluminum ash into a ball mill for ball milling, wherein the frequency of the ball mill is 40HZ, introducing nitrogen into the ball mill as a protective gas, and controlling the oxygen content to be in the range of 4.5-5.5%;
Delivering the flaky aluminum particle powder subjected to ball milling of the ball mill into a centrifugal separator by using a blower for centrifugal separation, delivering flaky aluminum particles output from an outlet above the centrifugal separator into a cyclone separator for cyclone separation, delivering thick flaky aluminum particles output from an outlet below the centrifugal separator back into a ball mill for continuous ball milling, wherein the frequency of the cyclone separator is 15 HZ;
After the flaky aluminum particles are subjected to cyclone separation in the cyclone separator, the flaky aluminum particles with small particle size output from an outlet above the cyclone separator are sent into a cloth bag type collector for cloth bag separation, other flaky aluminum particles with large particle size are output from an outlet below the cyclone separator, and flaky aluminum particles with large particle size output from an outlet below the cyclone separator are collected (D50 is not more than 35 mu m);
The flaky aluminum particles with small particle size pass through a filter bag in a bag-type collector, the flaky aluminum particles with small particle size are adsorbed on the filter bag and separated from nitrogen, the flaky aluminum particles with small particle size adsorbed on the filter bag are shaken off by nitrogen pulse impact and output from a lower outlet, and the flaky aluminum particles with small particle size output from the lower outlet of the bag-type collector are collected (D50 is not more than 20 mu m);
and (3) stirring and mixing flaky aluminum particles with small particle sizes, which are output from an outlet below a bag collector, with ethyl orthosilicate, ammonia water, polyethylene glycol (with a molecular weight of 1000) and water respectively, wherein the addition amount of the ethyl orthosilicate is 11wt% of the aluminum powder raw material, the addition amount of the ammonia water is 3wt% of the aluminum powder raw material, the ammonia water is ammonia water with a mass fraction of 25-28%, the addition amount of the polyethylene glycol is 5wt% of the aluminum powder raw material, the addition amount of the water is 3 times of the weight of the aluminum powder raw material, and stirring and mixing for 10 hours to obtain the aluminum powder paste.
The aluminum powder paste obtained in the embodiment meets the requirements of national standard JC/T407-2008 aluminum powder paste for aerated concrete, and the aluminum powder paste obtained in the embodiment and the comparative example is used as a gas generating agent of autoclaved aerated concrete for detection, and specifically comprises the following steps:
The autoclaved aerated concrete block comprises the following raw materials in parts by weight: the weight ratio of the fly ash is 64.38%, the weight ratio of the lime is 23%, the weight ratio of the cement is 10%, the weight ratio of the gypsum is 2.5%, and the weight ratio of the aluminum powder paste of the embodiment/comparative example is 0.12%; the water-material ratio is 0.63, the fly ash and lime are respectively subjected to ball milling refinement pretreatment, and after ball milling, the powder is sieved, and the powder with the grain diameter not more than 0.35 mu m is sieved;
Preparation of autoclaved aerated concrete blocks: adding fly ash and gypsum into a pulping tank, adding warm water at 55 ℃ and stirring until the mixture is uniform to prepare primary pulp, adding lime and cement into the primary pulp, continuously stirring until the mixture is uniform to prepare mixed pulp, finally adding aluminum powder paste into the mixed pulp, continuously stirring for 45 seconds and uniformly mixing to prepare foaming pulp; injecting the foaming slurry into a preheated metal mold, pouring at 50 ℃, placing the poured slurry blank in a static stopping chamber at 45 ℃ along with the mold, foaming for 35min, continuously stopping for 2h, and cutting the blank into standard sizes by adopting an automatic cutting device to obtain a molded green brick; and (3) feeding the molded green bricks into an autoclaved kettle, heating and boosting to 1.2MPa and 178 ℃ in 3h, keeping constant pressure and constant temperature for 6h, discharging air, reducing pressure and cooling, and discharging from the kettle to obtain the autoclaved aerated concrete block.
Through detection, the size of the air holes and the thickness of the hole walls in the autoclaved aerated concrete block are uniform, and the dry density of the autoclaved aerated concrete block is 624kg/m 3 and the compressive strength is 5.6MPa according to national standard GB 11968-2008.
Through detection, the size of the air holes and the thickness of the hole walls in the autoclaved aerated concrete block in the comparative example 1 are uneven, irregular approximate ellipse and columnar holes with the size reaching a plurality of millimeters are formed at intervals, and the dry density of the autoclaved aerated concrete block is 713kg/m 3 and the compressive strength is 3.4MPa according to national standard GB 11968-2008.
Through detection, the size of the air holes in the autoclaved aerated concrete block of the comparative example 2 and the thickness of the hole walls are approximately uniform, irregular approximate ellipse and column holes with the size reaching a plurality of millimeters are formed at intervals in local places, and the autoclaved aerated concrete block has the dry density of 689kg/m 3 and the compressive strength of 4.0MPa according to national standard GB 11968-2008.
As shown by the experimental results, compared with the traditional method of coating aluminum powder by stearic acid, when the aluminum powder paste is used as the air generating agent, the air-entrained concrete has sufficient air generation and higher compressive strength. Compared with aluminum powder paste obtained by directly coating aluminum powder with silicon dioxide, in the embodiment, the silane coupling agent KH-550 is used for carrying out grafting reaction on the aluminum powder in advance in the ball milling stage, and then the silicon dioxide is used for coating the aluminum powder, so that the coating degree of the silicon dioxide on the aluminum powder can be effectively adjusted, and when the aluminum powder paste is used as a gas generating agent, the pore structure can be more optimized, the uniformity of pore distribution can be improved, and the strength of aerated concrete can be further improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art who is skilled in the art should, based on the technical solution of the present invention and the equivalents and modifications thereof, be included in the scope of the present invention.
Claims (11)
1. The processing method of the aluminum powder paste is characterized by comprising the following steps of: adding aluminum powder raw materials and ball milling auxiliary agents into a ball mill for ball milling, then sending the ball milling raw materials and the ball milling auxiliary agents into a centrifugal separator for centrifugal separation, separating flaky aluminum particles and thick flaky aluminum particles, sending the flaky aluminum particles into a cyclone separator for cyclone separation, further separating flaky aluminum particles with small particle size and flaky aluminum particles with large particle size, sending the flaky aluminum particles with small particle size into a bag type collector for bag collection, and respectively coating the flaky aluminum particles with small particle size and the flaky aluminum particles with large particle size, which are collected from the bag type collector, with the aqueous auxiliary agents to obtain the aluminum powder paste;
the ball milling auxiliary agent is a silane coupling agent KH-550; the addition amount of the silane coupling agent KH-550 is 1-5wt% of the aluminum powder raw material;
the aqueous auxiliary agent comprises tetraethoxysilane, ammonia water, polyethylene glycol and water;
The addition amount of the tetraethoxysilane is 7-15wt% of the aluminum powder raw material, the addition amount of the ammonia water is 1-5wt% of the aluminum powder raw material, the addition amount of the polyethylene glycol is 3-7wt% of the aluminum powder raw material, and the addition amount of the water is 2-4 times of the weight of the aluminum powder raw material; the molecular weight of polyethylene glycol is 200-2000.
2. The method of processing aluminum paste according to claim 1, wherein the thick plate-like aluminum particles separated from the centrifugal separator are returned to the ball mill for ball milling again.
3. The method for processing aluminum paste according to claim 1 or 2, wherein inert gas is introduced as a shielding gas during the operation of the ball mill, the centrifugal separator, the cyclone separator and the bag collector.
4. The method of claim 3, wherein the inert gas is nitrogen.
5. The method for processing aluminum paste according to claim 1 or 2, wherein the particle diameter D50 of the flaky aluminum particles collected from the bag collector is not more than 20 μm and the particle diameter D50 of the flaky aluminum particles collected from the cyclone separator is not more than 35 μm.
6. The method for processing aluminum powder paste according to claim 1 or 2, wherein the aluminum powder raw material is at least one of aluminum powder, aluminum ash, aluminum slag or aluminum foil.
7. A processing system for aluminum paste for realizing the processing method according to any one of claims 1 to 6, comprising: the device comprises a ball mill (2), a centrifugal separator (3), a cyclone separator (4), a bag collector (5), a first buffer tank (6) and a second buffer tank (7);
The discharge gate of ball mill (2) links to each other with the feed inlet of centrifugal separator (3), and the first discharge gate of centrifugal separator (3) links to each other with the feed inlet of cyclone (4), and the second discharge gate of centrifugal separator (3) links to each other with the feed inlet of ball mill (2), and the first discharge gate of cyclone (4) links to each other with the feed inlet of pocket type collector (5), and the second discharge gate of cyclone (4) links to each other with the feed inlet of first buffer tank (6), and the discharge gate of pocket type collector (5) links to each other with the feed inlet of second buffer tank (7).
8. The aluminum paste processing system as recited in claim 7, further comprising a high-pressure fan (10);
The air outlet of the high-pressure fan (10) is connected with the ball mill (2), and the air inlet of the high-pressure fan (10) is connected with the air outlet of the bag collector (5).
9. The processing system of aluminum paste according to claim 7, further comprising a feeder (1), a first mixer (8) and a second mixer (9);
The discharge gate of feeder (1) links to each other with the feed inlet of ball mill (2), and the feed inlet of first mixer (8) links to each other with the discharge gate of first buffer tank (6), and the feed inlet of second mixer (9) links to each other with the discharge gate of second buffer tank (7).
10. An air generating agent, characterized in that it comprises the aluminum powder paste obtained by the processing method according to any one of claims 1 to 6.
11. Aerated concrete, characterized in that it comprises a gas generating agent according to claim 10.
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