CN109607587B - Manufacturing equipment and manufacturing method of superfine aluminum hydroxide - Google Patents
Manufacturing equipment and manufacturing method of superfine aluminum hydroxide Download PDFInfo
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- CN109607587B CN109607587B CN201910098227.7A CN201910098227A CN109607587B CN 109607587 B CN109607587 B CN 109607587B CN 201910098227 A CN201910098227 A CN 201910098227A CN 109607587 B CN109607587 B CN 109607587B
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- 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
- C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
- C01F7/302—Hydrolysis or oxidation of gaseous aluminium compounds in the gaseous phase
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- 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
- C01P2006/10—Solid density
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- 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
- C01P2006/11—Powder tap density
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- 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
- C01P2006/12—Surface area
Abstract
The invention discloses a manufacturing device and a manufacturing method of superfine aluminum hydroxide. The equipment comprises a reactor, a collecting device and an absorbing device, the reactor is communicated with an aluminum salt tank and a water storage tank, a turbine is arranged in the reactor, the side edge of the top of the reactor is communicated with the collecting device, the collecting device comprises a cyclone dust collector, a dust collecting cloth bag is arranged at the top of the cyclone dust collector, the dust collecting cloth bag is communicated with an induced draft fan through a pipeline, the induced draft fan is communicated with the absorbing device, heating devices are arranged on the aluminum salt tank and the water storage tank respectively, the aluminum salt tank and the water storage tank are communicated with the reactor through titanium pipes, the preparation method is to evaporate aluminum chloride and water into steam, then, gas phase reaction is carried out in the reactor to obtain aluminum hydroxide, and superfine aluminum hydroxide is obtained through the cyclone dust collector. The method has the advantages of simple equipment, continuous synthesis, simple preparation method, low cost, no wastewater generation, narrow particle size distribution of the obtained superfine aluminum hydroxide, good dispersibility and high purity.
Description
Technical Field
The invention relates to a manufacturing device and a manufacturing method of superfine aluminum hydroxide, belonging to the technical field of powder preparation.
Background
Aluminum hydroxide (aluminum hydroxide), formula al (oh)3, is a hydroxide of aluminum. It is also called aluminum monohydrate (HAlO 2. H2O) because it has a certain acidity, but the aluminum tetrahydroxy aluminate Al (OH) 4-is produced when it reacts with alkali in the aqueous solution, and is classified into industrial grade and pharmaceutical grade according to its application.
The industrial production comprises the following two methods: 1. the bayer process, austria bayer (k.j.bayer), was invented in 1888. The principle is that caustic soda (NaOH) solution is used for heating and dissolving alumina in bauxite to obtain sodium aluminate solution. After the solution is separated from the residue (red mud), the temperature is reduced, aluminum hydroxide is added as seed crystal, and the sodium aluminate is decomposed to separate out the aluminum hydroxide after long-time stirring. The Bayer process has the advantages of simple process, low investment and energy consumption, the lowest energy consumption of about 3X 106 kilocalories per ton of alumina, and the alkali consumption of about 100 kilograms (calculated by Na2CO 3).
A soda lime sintering method for treating high-silicon bauxite includes such steps as proportionally mixing bauxite, sodium carbonate and lime, and sintering in rotary kiln to obtain clinker consisting of sodium aluminate, sodium ferrite, calcium orthosilicate and sodium titanate. Then dilute alkali solution is used for dissolving out the sodium aluminate in the clinker. At this time, NaOH obtained by hydrolysis of sodium ferrite also enters the solution. If the dissolution conditions are properly controlled, calcium orthosilicate will not react with sodium aluminate solution in a large amount, but will react with calcium titanate and Fe2O3.H2And discharging the red mud consisting of O and the like. The sodium aluminate solution obtained by dissolving out clinker is subjected to a special desiliconization process, SiO2The solution is purified by the formation of hydrated sodium aluminosilicates (known as sodium silica sludge) or hydrated garnet precipitates. Reacting CO with2Introducing gas into the refined sodium aluminate solution, adding seed crystals, and stirring to obtain aluminum hydroxide precipitate and mother liquor mainly containing sodium carbonate.
Aluminum hydroxide is the largest and most widely used inorganic flame retardant additive. The aluminum hydroxide serving as a flame retardant can not only resist flame, but also prevent fuming, does not produce dripping and does not produce toxic gas, so that the aluminum hydroxide is widely applied, and the using amount is increased year by year. The application range is in the industries of thermosetting plastics, thermoplastic plastics, synthetic rubber, paint, building materials and the like. Meanwhile, the aluminum hydroxide is also a basic raw material of aluminum fluoride required by the electrolytic aluminum industry, and the aluminum hydroxide is widely applied in the industry.
The superfine high-dispersion aluminum hydroxide can be applied to catalysts, papermaking fillers, latex complexes, synthetic rubber, polyvinyl chloride, epoxy resin, flame-retardant fillers of polyester resin, polishing agents for precision processing, rubbing agents for toothpaste, flocculating agents for urban water supply and the like, and is quite wide in application field. By 2005, the consumption of the flame retardant only applied to western countries reaches 17.5 ten thousand tons, and the consumption of the flame retardant only applied to china reaches 9000 tons, so the research on the high-purity superfine aluminum hydroxide has become a key subject of development and research of countries all over the world.
The production process of the ultra-fine aluminum hydroxide mainly comprises two processes, one process is a physical process: the industrial aluminum hydroxide with large particle size is crushed into small particle size by mechanical crushing, and the method has the advantages of simple process and small investment, but only can obtain the particle size of more than 3 mu m, and has wide particle size distribution and damaged crystal structure; the other is a chemical method, and there are two main ways:
1) the liquid phase precipitation method, which prepares aluminum hydroxide by acid-base salt containing aluminum ions, has high cost:
2) the Bayer process comprises dissolving aluminum hydroxide with alkali to obtain supersaturated sodium aluminate solution, adding aluminum hydroxide as seed crystal to precipitate aluminate ions in the solution in the form of aluminum hydroxide, and obtaining high-quality aluminum hydroxide with low impurity content and small particle size. However, the preparation process is high in requirement, and the grain size of the product is increased after seed separation once, so that the decomposed aluminum hydroxide cannot be recycled as seed crystals, and therefore, the seed crystals need to be prepared in each batch, and the cost is increased.
Disclosure of Invention
In view of the above, the present invention provides a manufacturing apparatus and a manufacturing method of ultrafine aluminum hydroxide, which have the advantages of simple apparatus, continuous synthesis, simple preparation method, low cost, no wastewater generation, narrow particle size distribution of the obtained ultrafine aluminum hydroxide, good dispersibility, and high purity.
The invention solves the technical problems by the following technical means:
the invention discloses manufacturing equipment of superfine aluminum hydroxide, which comprises a reactor, a collecting device and an absorbing device, wherein the reactor is communicated with an aluminum salt tank and a water storage tank, a turbine is arranged in the reactor, the side edge of the top of the reactor is communicated with the collecting device, the collecting device comprises a cyclone dust collector, a dust collecting cloth bag is arranged at the top of the cyclone dust collector, the interior of the dust collecting cloth bag is communicated with an induced draft fan through a pipeline, the induced draft fan is communicated with the absorbing device, heating devices are arranged on the aluminum salt tank and the water storage tank, the aluminum salt tank and the water storage tank are communicated with the reactor through a titanium pipe, a volume flow meter, a temperature sensor and a pressure gauge are arranged on the titanium pipe, the titanium pipe is communicated with a premixing pipe, the turbine is connected with a motor, an air blowing pipe is arranged in the aluminum salt tank, a thermometer is arranged on the cyclone dust.
The turbine includes the fixed disk, be provided with the blade on the fixed disk, the blade is right trapezoid, and the blade equipartition just is perpendicular to fixed disk on the fixed disk, and fixed disk and blade are zirconia ceramic material.
The dust collection device comprises a dust collection cloth bag, a pre-mixing pipe, a titanium support frame and a draught fan, wherein the pre-mixing pipe is arranged at the bottom of the reactor and is an annular pipe, a communicating pipe is arranged in the middle of the annular pipe, air outlet holes are uniformly distributed in the communicating pipe, the titanium pipe is communicated with the annular pipe, the aperture of each air outlet hole is 0.5-2mm, the number of the dust collection cloth bag is 800-1200 meshes, the titanium support frame is arranged in the dust collection cloth.
The diameter of the turbine is 1/2-2/3 of the inner diameter of the reactor, the length of the vanes is 0.5-0.8 time of the diameter of the fixed disc, and the length ratio of the upper edges to the lower edges of the vanes is 0.5-0.8 time.
A method for manufacturing superfine aluminum hydroxide comprises the following steps:
(1) respectively placing anhydrous aluminum chloride and water in an aluminum salt tank and a water storage tank, heating until the temperature in the aluminum salt tank is 450-550 ℃, maintaining the pressure in the aluminum salt tank at 1.2-1.4 atmospheric pressures, heating until the temperature in the water storage tank is 120-140 ℃, and maintaining the pressure in the water storage tank at 1.2-1.4 atmospheric pressures;
(2) starting a motor to enable the rotating speed of a turbine to be 1400-1600r/min, starting an induced draft fan to enable the gas flow speed in a pipeline communicated between the interior of a dust collection cloth bag and the induced draft fan to be 2-5m/s, simultaneously maintaining the temperature in a cyclone dust collector to be more than 130 ℃, starting an absorption device, and discharging the waste gas led out by the induced draft fan after absorption;
(3) opening an air blowing pipe, introducing compressed air, and maintaining the flow velocity of air flow in the air blowing pipe to be 2-5 m/s;
(4) mixing aluminum chloride gas and water vapor in a premixing tube, keeping the mixture in the reactor for 15-30s, and then leading the mixture into a cyclone dust collector;
(5) and after the reaction is finished, after the dust collecting material on the dust collecting cloth bag is blown, taking out the collecting box, and packaging after sieving to obtain the superfine aluminum hydroxide powder.
The temperature in the reactor is maintained at 350 ℃ and 200-300 mesh sieve is used for sieving.
The equipment adopts an aluminum salt tank and a water storage tank to store aluminum salt and water, then the aluminum salt tank and the water storage tank are heated to convert aluminum chloride and water into steam, the steam is conveyed into a premixing pipe for premixing under the action of pressure and then conveyed into a reactor, the turbine is arranged in the reactor and rotates to drive the gas in the whole reactor to be mixed, simultaneously, the obtained aluminum hydroxide is thrown onto the peripheral wall of the reactor due to centrifugal force, then, the induced draft fan is started to drive the movement of air flow, so that the superfine aluminum hydroxide is brought into cyclone dust collection, most of materials fall into a collection box after cyclone dust collection, a small amount of materials are collected by a dust collection cloth bag, and the rest gas is sprayed and absorbed to obtain hydrochloric acid solution.
Compared with liquid phase synthesis, the method for preparing the superfine aluminum hydroxide avoids the agglomeration of the aluminum hydroxide due to the reaction in a gas phase, and the obtained aluminum hydroxide has fine granularity, uniform granularity distribution and good dispersibility, can realize continuous production, can recycle hydrochloric acid solution obtained by spraying and absorbing without generating other waste water, does not have the processes of washing and the like, reduces the waste water discharge, and has good environmental protection property.
The equipment of the invention can observe parameters such as flow, temperature, pressure and the like through the volume flow meter, the temperature sensor and the pressure gauge which are arranged on the titanium pipe, and the premixing pipe can realize premixing of water vapor and aluminum chloride vapor.
The equipment skillfully integrates the dust collecting cloth bag and the cyclone dust collector into a whole, can reduce equipment investment and floor area, and avoids the separation of cyclone materials and dust collecting materials, thereby avoiding the material mixing process, and the obtained materials can be packaged after being screened.
Be provided with the blast pipe in the aluminium salt jar of this patent, the blast pipe is bloated into compressed air, can lightly blow aluminium chloride, avoids a large amount of adhesions of aluminium chloride on aluminium salt jar inner wall, has also played the effect of tonifying qi simultaneously for the draught fan when the start-up, produces the air current, drives the flow of steam and aluminium hydroxide.
Under the gas phase, the synthesis of the aluminum hydroxide is realized, the uniform mixing degree of the materials is very high under the gas phase, and the materials can be classified (under the action of the centrifugal force of the turbine) due to the existence of the turbine and quickly enter the cyclone dust collector under the action of the induced draft fan, so that the growth of particles of the materials is avoided, the retention time in the reactor is 15-30s, and the obtained superfine aluminum hydroxide is narrow in particle size distribution, good in dispersibility and high in purity.
The invention has the beneficial effects that: the method has the advantages of simple equipment, continuous synthesis, simple preparation method, low cost, no wastewater generation, narrow particle size distribution of the obtained superfine aluminum hydroxide, good dispersibility and high purity.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a structural view of a manufacturing apparatus of the present invention.
FIG. 2 is a schematic view of a premix tube configuration of the present invention.
Fig. 3 is a schematic view of the turbine structure of the present invention.
Detailed Description
The invention will be described in detail below with reference to the accompanying drawings, as shown in figures 1, 2 and 3: the manufacturing equipment of the superfine aluminum hydroxide comprises a reactor 1, a collecting device 2 and an absorbing device 3, wherein the reactor 1 is communicated with an aluminum salt tank 4 and a water storage tank 5, a turbine 6 is arranged in the reactor 1, the side edge of the top of the reactor 1 is communicated with the collecting device 2, the collecting device 2 comprises a cyclone dust collector 7, the top of the cyclone dust collector 7 is provided with a dust collecting cloth bag 8, the inside of the dust collecting cloth bag 8 is communicated with an induced draft fan 9 through a pipeline, the induced draft fan 9 is communicated with the absorbing device 3, the aluminum salt tank 4 and the water storage tank 5 are both provided with heating devices 10, the aluminum salt tank 4 and the water storage tank 5 are both communicated with the reactor 1 through a titanium pipe 11, the titanium pipe 11 is provided with a volume flow meter 12, a temperature sensor 13 and a pressure meter 14, the titanium pipe 11 is communicated with a premixing pipe 15, the turbine 6 is connected with a motor 16, the aluminum salt, a thermometer 18 is arranged on the cyclone dust collector 7, and a collecting box 19 is arranged at the bottom of the cyclone dust collector 7.
The turbine 6 includes fixed disk 20, be provided with blade 21 on the fixed disk 20, blade 21 is right trapezoid, and blade 21 equipartition is on fixed disk 20 and perpendicular to fixed disk 20, and fixed disk 20 and blade 21 are zirconia ceramic material.
The pre-mixing pipe 15 is arranged at the bottom of the reactor 1, the pre-mixing pipe 15 is an annular pipe, the middle part of the annular pipe is provided with a communicating pipe 22, air outlet holes 23 are uniformly distributed on the communicating pipe 22, the titanium pipe 11 is communicated with the annular pipe, the aperture of the air outlet hole 23 is 0.5-2mm, the mesh number of the dust collection cloth bag 8 is 800 meshes, a titanium support frame is arranged inside the dust collection cloth bag 8, and the induced draft fan 9 is a variable frequency motor.
The diameter of the turbine 6 is 1/2-2/3 of the inner diameter of the reactor 1, the length of the vane 21 is 0.5-0.8 times of the diameter of the fixed disc 20, and the length ratio of the upper edge to the lower edge of the vane 21 is 0.5-0.8 times.
A method for manufacturing superfine aluminum hydroxide comprises the following steps:
(1) respectively placing anhydrous aluminum chloride and water in an aluminum salt tank 4 and a water storage tank 5, heating until the temperature in the aluminum salt tank 4 is 450-550 ℃, maintaining the pressure in the aluminum salt tank 4 at 1.2-1.4 atmospheric pressures, heating until the temperature in the water storage tank 5 is 120-140 ℃, and maintaining the pressure in the water storage tank 5 at 1.2-1.4 atmospheric pressures;
(2) starting a motor 16 to enable the rotating speed of the turbine 6 to be 1400-1600r/min, starting an induced draft fan 9 to enable the gas flow velocity in a pipeline communicated between the interior of the dust collection cloth bag 8 and the induced draft fan 9 to be 2-5m/s, simultaneously maintaining the temperature in the cyclone dust collector 7 to be more than 130 ℃, starting an absorption device 3 to absorb the waste gas led out by the induced draft fan 9 and then discharging the waste gas;
(3) opening the air blowing pipe 17, introducing compressed air, and maintaining the flow velocity of the air flow in the air blowing pipe 17 to be 2-5 m/s;
(4) after being mixed in the premixing pipe 15, the aluminum chloride gas and the water vapor stay in the reactor 1 for 15-30s, and then are led out to the cyclone dust collector 7;
(5) after the reaction is finished, after the dust collecting material on the dust collecting cloth bag 8 is blown, the collecting box 19 is taken out, and the superfine aluminum hydroxide powder is obtained after the screening and packaging.
The temperature in the reactor 1 is maintained at 350 ℃ and 200-300 mesh sieve is used for sieving.
Example 1
A manufacturing equipment of superfine aluminium hydroxide comprises a reactor 1, a collecting device 2 and an absorbing device 3, wherein the reactor 1 is communicated with an aluminium salt tank 4 and a water storage tank 5, a turbine 6 is arranged in the reactor 1, the side edge of the top of the reactor 1 is communicated with the collecting device 2, the collecting device 2 comprises a cyclone dust collector 7, the top of the cyclone dust collector 7 is provided with a dust collecting cloth bag 8, the inside of the dust collecting cloth bag 8 is communicated with an induced draft fan 9 through a pipeline, the induced draft fan 9 is communicated with the absorbing device 3, the aluminium salt tank 4 and the water storage tank 5 are both provided with a heating device 10, the aluminium salt tank 4 and the water storage tank 5 are both communicated with the reactor 1 through a titanium pipe 11, the titanium pipe 11 is provided with a volume flow meter 12, a temperature sensor 13 and a pressure meter 14, the titanium pipe 11 is communicated with a premixing pipe 15, the turbine 6 is connected with a motor 16, an air blowing pipe 17 is arranged in the aluminium salt tank, the bottom of the cyclone 7 is provided with a collecting box 19.
The turbine 6 includes fixed disk 20, be provided with blade 21 on the fixed disk 20, blade 21 is right trapezoid, and blade 21 equipartition is on fixed disk 20 and perpendicular to fixed disk 20, and fixed disk 20 and blade 21 are zirconia ceramic material.
The dust collection device is characterized in that the premixing pipe 15 is arranged at the bottom of the reactor 1, the premixing pipe 15 is an annular pipe, a communicating pipe 22 is arranged in the middle of the annular pipe, air outlets 23 are evenly distributed in the communicating pipe 22, the titanium pipe 11 is communicated with the annular pipe, the aperture of each air outlet 23 is 0.8mm, the mesh number of the dust collection cloth bag 8 is 1100 meshes, a titanium support frame is arranged inside the dust collection cloth bag 8, and the induced draft fan 9 is a variable frequency motor.
The diameter of the turbine 6 is 1/2 of the inner diameter of the reactor 1, the length of the vanes 21 is 0.6 times the diameter of the fixed disk 20, and the length ratio of the upper side to the lower side of the vanes 21 is 0.5 times.
The above-mentioned equipment is used for preparing superfine aluminium hydroxide,
the preparation method of the superfine aluminum hydroxide comprises the following steps:
(1) respectively placing anhydrous aluminum chloride and water in an aluminum salt tank 4 and a water storage tank 5, heating until the temperature in the aluminum salt tank 4 is 500 ℃, maintaining the pressure in the aluminum salt tank 4 at 1.25 atmospheric pressure, heating until the temperature in the water storage tank 5 is 135 ℃, and maintaining the pressure in the water storage tank 5 at 1.25 atmospheric pressure;
(2) starting a motor 16 to enable the rotating speed of a turbine 6 to be 1500r/min, starting an induced draft fan 9 to enable the gas flow velocity in a pipeline communicated between the interior of a dust collection cloth bag 8 and the induced draft fan 9 to be 4m/s, simultaneously maintaining the temperature in a cyclone dust collector 7 to be more than 130 ℃, starting an absorption device 3, and discharging the waste gas led out by the induced draft fan 9 after absorption;
(3) opening the air blowing pipe 17, introducing compressed air, and maintaining the flow velocity of air flow in the air blowing pipe 17 to be 3 m/s;
(4) after being mixed in the premixing pipe 15, the aluminum chloride gas and the water vapor stay in the reactor 1 for 25s, and then are led out to the cyclone dust collector 7;
(5) after the reaction is finished, after the dust collecting material on the dust collecting cloth bag 8 is blown, the collecting box 19 is taken out, and the superfine aluminum hydroxide powder is obtained after the screening and packaging.
The temperature in the reactor 1 was maintained at 330 ℃ and the sieve was passed through a 250 mesh sieve.
The finally obtained superfine aluminum hydroxide is detected, and the data is as follows:
| item | Al | Ca | Fe | Mg | K | Na |
| Numerical value | 34.60％ | 1.8ppm | 0.3ppm | 2.6ppm | 4.9ppm | 4.3ppm |
| Zn | Ni | Co | Cu | Cd | Pb | Cr |
| 0.2ppm | 0.2ppm | 0.4ppm | 0.1ppm | 0.1ppm | 0.2ppm | 0.1ppm |
| Ti | Dmin | D10 | D50 | D90 | Dmax | Primary particle diameter |
| 2.9ppm | 0.12μm | 0.23μm | 0.43μm | 0.68μm | 0.78μm | 85nm |
| BET | Sulfate radical | Chloride ion | Acid insoluble substance | Bulk density | Tap density | |
| 45m2/g | 6ppm | 12ppm | 5.7ppm | 0.35g/mL | 0.8g/mL |
Example 2
A manufacturing equipment of superfine aluminium hydroxide comprises a reactor 1, a collecting device 2 and an absorbing device 3, wherein the reactor 1 is communicated with an aluminium salt tank 4 and a water storage tank 5, a turbine 6 is arranged in the reactor 1, the side edge of the top of the reactor 1 is communicated with the collecting device 2, the collecting device 2 comprises a cyclone dust collector 7, the top of the cyclone dust collector 7 is provided with a dust collecting cloth bag 8, the inside of the dust collecting cloth bag 8 is communicated with an induced draft fan 9 through a pipeline, the induced draft fan 9 is communicated with the absorbing device 3, the aluminium salt tank 4 and the water storage tank 5 are both provided with a heating device 10, the aluminium salt tank 4 and the water storage tank 5 are both communicated with the reactor 1 through a titanium pipe 11, the titanium pipe 11 is provided with a volume flow meter 12, a temperature sensor 13 and a pressure meter 14, the titanium pipe 11 is communicated with a premixing pipe 15, the turbine 6 is connected with a motor 16, an air blowing pipe 17 is arranged in the aluminium salt tank, the bottom of the cyclone 7 is provided with a collecting box 19.
The turbine 6 includes fixed disk 20, be provided with blade 21 on the fixed disk 20, blade 21 is right trapezoid, and blade 21 equipartition is on fixed disk 20 and perpendicular to fixed disk 20, and fixed disk 20 and blade 21 are zirconia ceramic material.
The dust collection device is characterized in that the premixing pipe 15 is arranged at the bottom of the reactor 1, the premixing pipe 15 is an annular pipe, a communicating pipe 22 is arranged in the middle of the annular pipe, air outlets 23 are evenly distributed in the communicating pipe 22, the titanium pipe 11 is communicated with the annular pipe, the aperture of each air outlet 23 is 1.5mm, the mesh number of the dust collection cloth bag 8 is 1200 meshes, a titanium support frame is arranged inside the dust collection cloth bag 8, and the induced draft fan 9 is a variable frequency motor.
The diameter of the turbine 6 is 2/3 of the inner diameter of the reactor 1, the length of the vanes 21 is 0.6 times the diameter of the fixed disk 20, and the length ratio of the upper side to the lower side of the vanes 21 is 0.8 times.
The production of the superfine aluminum hydroxide by the equipment comprises the following steps:
(1) respectively placing anhydrous aluminum chloride and water in an aluminum salt tank 4 and a water storage tank 5, heating until the temperature in the aluminum salt tank 4 is 520 ℃, maintaining the pressure in the aluminum salt tank 4 at 1.35 atmospheric pressure, heating until the temperature in the water storage tank 5 is 135 ℃, and maintaining the pressure in the water storage tank 5 at 1.35 atmospheric pressure;
(2) starting a motor 16 to enable the rotating speed of a turbine 6 to be 1500r/min, starting an induced draft fan 9 to enable the gas flow velocity in a pipeline communicated between the interior of a dust collection cloth bag 8 and the induced draft fan 9 to be 4m/s, simultaneously maintaining the temperature in a cyclone dust collector 7 to be more than 130 ℃, starting an absorption device 3, and discharging the waste gas led out by the induced draft fan 9 after absorption;
(3) opening the air blowing pipe 17, introducing compressed air, and maintaining the flow velocity of the air flow in the air blowing pipe 17 to be 4 m/s;
(4) after being mixed in the premixing pipe 15, the aluminum chloride gas and the water vapor stay in the reactor 1 for 25s, and then are led out to the cyclone dust collector 7;
(5) after the reaction is finished, after the dust collecting material on the dust collecting cloth bag 8 is blown, the collecting box 19 is taken out, and the superfine aluminum hydroxide powder is obtained after the screening and packaging.
The temperature in the reactor 1 was maintained at 330 ℃ and the sieve was passed through a 250 mesh sieve.
The finally obtained superfine aluminum hydroxide is detected, and the data is as follows:
| item | Al | Ca | Fe | Mg | K | Na |
| Numerical value | 34.59％ | 1.2ppm | 0.2ppm | 2.1ppm | 5.3ppm | 4.1ppm |
| Zn | Ni | Co | Cu | Cd | Pb | Cr |
| 0.1ppm | 0.1ppm | 0.2ppm | 0.2ppm | 0.2ppm | 0.3ppm | 0.1ppm |
| Ti | Dmin | D10 | D50 | D90 | Dmax | Primary particle diameter |
| 3.2ppm | 0.12μm | 0.25μm | 0.42μm | 0.67μm | 0.72μm | 88nm |
| BET | Sulfate radical | Chloride ion | Acid insoluble substance | Bulk density | Tap density | |
| 48m2/g | 6ppm | 14ppm | 5.1ppm | 0.35g/mL | 0.75g/mL |
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The utility model provides a manufacturing equipment of superfine aluminium hydroxide, a serial communication port, including reactor (1), collection device (2) and absorbing device (3), reactor (1) and aluminate jar (4) and water storage tank (5) intercommunication, be provided with turbine (6) in reactor (1), reactor (1) top side and collecting device (2) intercommunication, collecting device (2) are including cyclone (7), and the top of cyclone (7) is provided with gathers dust sack (8), gathers dust sack (8) inside and draught fan (9) through the pipeline intercommunication, draught fan (9) and absorbing device (3) intercommunication, all be provided with heating device (10) on aluminate jar (4) and water storage tank (5), aluminate jar (4) and water storage tank (5) all communicate with reactor (1) through titanium pipe (11), are provided with volumetric flowmeter (12) on titanium pipe (11), Temperature sensor (13) and manometer (14), titanium pipe (11) and premix pipe (15) intercommunication, turbine (6) are connected with motor (16), be provided with blast pipe (17) in aluminate jar (4), be provided with thermometer (18) on cyclone (7), cyclone (7) bottom is provided with collects box (19).
2. The manufacturing equipment of ultra-fine aluminum hydroxide as claimed in claim 1, wherein: turbine (6) are including fixed disk (20), be provided with blade (21) on fixed disk (20), blade (21) are right trapezoid, and blade (21) equipartition is on fixed disk (20) and perpendicular to fixed disk (20), and fixed disk (20) and blade (21) are zirconia ceramic material.
3. The manufacturing equipment of ultra-fine aluminum hydroxide as claimed in claim 1, wherein: the dust collection device is characterized in that the premixing pipe (15) is arranged at the bottom of the reactor (1), the premixing pipe (15) is an annular pipe, the middle of the annular pipe is provided with a communicating pipe (22), air outlet holes (23) are uniformly distributed in the communicating pipe (22), the titanium pipe (11) is communicated with the annular pipe, the aperture of each air outlet hole (23) is 0.5-2mm, the mesh number of the dust collection cloth bag (8) is 800 meshes, a titanium support frame is arranged inside the dust collection cloth bag (8), and the induced draft fan (9) is a variable frequency motor.
4. The manufacturing equipment of ultra-fine aluminum hydroxide as claimed in claim 2, wherein: the diameter of the turbine (6) is 1/2-2/3 of the inner diameter of the reactor (1), the length of the vane (21) is 0.5-0.8 times of the diameter of the fixed disc (20), and the length ratio of the upper edge to the lower edge of the vane (21) is 0.5-0.8 times.
5. The method for manufacturing the superfine aluminum hydroxide is characterized by comprising the following steps:
(1) respectively placing anhydrous aluminum chloride and water in an aluminum salt tank (4) and a water storage tank (5), heating until the temperature in the aluminum salt tank (4) is 450-550 ℃, maintaining the pressure in the aluminum salt tank (4) at 1.2-1.4 atmospheric pressures, heating until the temperature in the water storage tank (5) is 120-140 ℃, and maintaining the pressure in the water storage tank (5) at 1.2-1.4 atmospheric pressures;
(2) starting a motor (16) to enable the rotating speed of a turbine (6) to be 1400-1600r/min, starting an induced draft fan (9) to enable the gas flow velocity in a pipeline communicated between the interior of a dust collection cloth bag (8) and the induced draft fan (9) to be 2-5m/s, simultaneously maintaining the temperature in a cyclone dust collector (7) to be more than 130 ℃, starting an absorption device (3), and absorbing and discharging the waste gas led out by the induced draft fan (9);
(3) opening the air blowing pipe (17), introducing compressed air, and maintaining the flow velocity of the air flow in the air blowing pipe (17) to be 2-5 m/s;
(4) after being mixed in a premixing pipe (15), the aluminum chloride gas and the water vapor stay in the reactor (1) for 15-30s, and then are led out to a cyclone dust collector (7);
(5) after the reaction is finished, after the dust collecting material on the dust collecting cloth bag (8) is blown, the collecting box (19) is taken out, and the superfine aluminum hydroxide powder is obtained after the screening and packaging.
6. The method for producing ultrafine aluminum hydroxide according to claim 5, wherein: the temperature in the reactor (1) is maintained at 350 ℃ and 200-300 mesh sieve is used for sieving.
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