CN111498882B - Method for preparing coarse-particle aluminum hydroxide from aluminum ammonium sulfate solution - Google Patents
Method for preparing coarse-particle aluminum hydroxide from aluminum ammonium sulfate solution Download PDFInfo
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- CN111498882B CN111498882B CN202010359320.1A CN202010359320A CN111498882B CN 111498882 B CN111498882 B CN 111498882B CN 202010359320 A CN202010359320 A CN 202010359320A CN 111498882 B CN111498882 B CN 111498882B
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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
- C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Abstract
The invention relates to a method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution, which comprises the steps of mixing the aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter through a solution pump, pumping the mixture into a horizontal reaction tank from a feed inlet of the horizontal reaction tank, alternately arranging an upper reinforcing guide plate and a lower reinforcing guide plate from the feed inlet to a discharge outlet inside a tank body of the horizontal reaction tank, covering acid-resistant layers on the surfaces of the upper reinforcing guide plate, the lower reinforcing guide plate and the inner wall of the tank body, arranging a heating sleeve on the periphery of the tank body, allowing the mixed solution to enter the feed inlet to the discharge outlet, discharging the mixed solution for reaction for 4 to 10 hours, carrying out solid-liquid separation on the flowing slurry to obtain solid and liquid, and washing and drying the solid to obtain the coarse-grained aluminum hydroxide. The invention has no influence of mechanical stirring, reduces the exit of gas-phase substances and the chance of mechanical crushing of aluminum hydroxide particles, and provides conditions for the continuous growth of aluminum hydroxide.
Description
Technical Field
The invention belongs to the field of aluminum oxide material production, and particularly relates to a preparation method of coarse-particle aluminum hydroxide in an acidic system.
Background
China is a large alumina producing country, the yield is the first world for years, and the total production amount exceeds 50 percent of the total world production amount. Alumina is mainly obtained by processing bauxite by a Bayer process or a sintering process, but the bauxite resource in China is deficient, and the existing reserves cannot meet the requirement of the development of alumina industry. The search for other non-bauxite aluminum-containing resources to produce alumina becomes a problem to be urgently solved for realizing sustainable development of the alumina industry in China.
For many years, high-alumina fly ash has been a research hotspot of researchers because high aluminum content is regarded as a 'misplaced resource'. Up to now, methods for extracting alumina from fly ash can be classified into an alkaline method, an acid method and an ammonium method. The alkaline process technology generates a large amount of calcium silicate slag in the production process, belongs to the increment technology (the generated tailings are more than the usage amount of fly ash), and has the problems of difficult utilization of a large amount of generated tailings, low product quality and large sale market radius. The acid method for treating the fly ash belongs to a reduction process, and accords with the national solid waste reduction utilization policy. The main defects of the acid method are that the equipment adopted in the production process must resist acid, the corrosion resistance requirement is high, the difficulty is high, the corrosion resistance and the environmental protection requirement of a factory building are also high due to a large amount of acid gas generated by decomposing the aluminum salt, the obtained alumina product has fine particles and low volume weight (0.38 to 0.35), and the alumina product does not meet the metallurgical grade alumina standard required by the modern electrolytic aluminum industry.
The ammonium method for treating the fly ash to extract the alumina mainly comprises a mixed sintering method of ammonium sulfate or ammonium bisulfate and the fly ash, and has the advantages of low sintering temperature, low energy consumption and process reduction, wherein the obtained high-silicon slag is used for high-silicon fillers after being simply treated, and can also be used for deep processing and preparing high-added-value products such as white carbon black and the like, and the high-iron slag is used as an iron-making raw material. In addition, the reaction system is a weak acid system, the corrosion prevention requirement of equipment is low, and the large-scale and industrial implementation is facilitated. However, the intermediate material of the ammonium aluminum sulfate solution is acidic, and the existing equipment is difficult to produce coarse-grained aluminum hydroxide meeting the requirements of metallurgical-grade aluminum oxide.
Disclosure of Invention
Object of the Invention
Aiming at the problems of environmental protection and corrosion prevention, the invention provides a method for preparing coarse-grain aluminum hydroxide from an aluminum ammonium sulfate solution without mechanical stirring.
Technical scheme
A method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution comprises the steps of preparing materials including the aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter; mixing an aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter by a solution pump, pumping the mixture into a horizontal reaction tank from a feed inlet of the horizontal reaction tank, alternately arranging an upper reinforced guide plate and a lower reinforced guide plate from the feed inlet to a discharge outlet in the tank body of the horizontal reaction tank, covering an acid-resistant layer on the surface of the upper reinforced guide plate, the surface of the lower reinforced guide plate and the inner wall of the tank body, arranging a heating sleeve on the periphery of the tank body, forming a sandwich structure with the tank body, arranging a heating medium inlet and a heating medium outlet on the heating sleeve, allowing a mixed solution to enter the discharge outlet from the feed inlet, discharging the mixed solution, reacting for 4 to 10 hours, performing solid-liquid separation on the flowing slurry to obtain a solid and a liquid, and washing and drying the solid to obtain coarse-particle aluminum hydroxide.
The concentration of aluminum ammonium sulfate in the aluminum ammonium sulfate solution is 140-370 g/L, the concentration of ammonia in the ammonia water solution is 10-25%, the temperature of the reaction system is 30-90 ℃, and the pH value of slurry flowing out of a discharge hole is 6-9.
The crystal growth promoter is one or a mixture of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, and the addition amount of the crystal growth promoter is 400-600 ppm.
The tank body of the horizontal reaction tank is of a horizontal structure, end covers are installed at two ends of the tank body and comprise a front end cover and a rear end cover, a feed port is formed in the front end cover, a discharge port is formed in the rear end cover, the included angle between the upper reinforced guide plate and the horizontal plane of the lower reinforced guide plate and the horizontal plane of the rear end cover is 30 to 90 degrees, a liquid flow disturbance part is arranged on the side, close to the front end cover, of the upper reinforced guide plate and the lower reinforced guide plate, and an acid-resistant layer covers the surface of the liquid flow disturbance part.
The cross section of an inner cavity of the tank body is circular or elliptical, the diameter of a long shaft of the cross section is 500 to 3000mm, the diameter ratio of the long shaft to the short shaft is 1 to 1.4, front end covers and rear end covers at two ends of the tank body are circular or elliptical matched with the tank body, the length-diameter ratio of the tank body is 1 to 20, the vertical distance from the uppermost end of a feed inlet to the top of the inner cavity of the tank body is 200 to 400mm, the vertical distance from the lowermost end of the discharge outlet to the bottom of the inner cavity of the tank body is 200 to 400mm, the liquid flow disturbance element is in a crossed shape of strip-shaped plates, the width of each crossed strip-shaped plate is 20 to 80mm, the crossing angle of the upper side and the lower side is larger than or equal to the crossing angle of the left side and the right side, and the included angle of the left side and the right side is 20 to 90 degrees; the overall thickness is 20 to 80mm, and the length is 0.25 to 0.50 times of the width of the reinforced guide plate.
One side of each lower strengthening guide plate, which is close to the rear end cover, is provided with an anti-material-accumulation plate, one end of each anti-material-accumulation plate is connected to the end face of the rear end of the lower strengthening guide plate, the other end of each anti-material-accumulation plate is connected to the inner wall of the tank body, and the surface of each anti-material-accumulation plate, which is exposed outside, is provided with an acid-resistant layer.
The acid-resistant layer is formed by stacking polytetrafluoroethylene coatings or acid-resistant bricks, and the thickness of the acid-resistant layer is 0.1 to 4mm.
The inner wall of the tank body is provided with a liquid flow direction changing bulge between the lower reinforced guide plates, the surface of the liquid flow direction changing bulge is also covered with an acid-resistant layer, the liquid flow direction changing bulge is arched, the upper reinforced guide plate is of a structure which is made of steel plates and is provided with an inner cavity, the upper side of the upper reinforced guide plate penetrates through the tank body and the heating sleeve and is provided with an opening, the upper reinforced guide plate is welded with the tank body and the heating sleeve together, the inner cavity of the tank body, the heating sleeve and the interlayer structure formed by the tank body and the outer side of the heating sleeve are isolated, and a temperature measuring instrument is inserted into the inner cavity of the upper reinforced guide plate.
A vibration probe is inserted into the inner cavity of the upper reinforced guide plate closest to the front end cover.
The upper part of the upper reinforced guide plate inserted with the vibration probe is provided with a supporting part, the periphery of the contact surface of the supporting part and the heating sleeve is provided with a groove, and the groove is filled with high-temperature-resistant sealant, preferably high-temperature-resistant silicone sealant; one or more reinforcing plates are connected between the upper reinforced guide plate inserted with the vibration probe and the inner wall of the tank body; one side of the liquid flow disturbing piece close to the front end cover is transversely provided with a plurality of concave semicircular flow disturbing grooves.
Advantages and effects
The aluminum ammonium sulfate solution and the ammonia water are precipitated, crystallized and grown in the continuous precipitation reaction device, and the outlet of gas phase substances escaping and the mechanical crushing of aluminum hydroxide particles are reduced due to no influence of mechanical stirring. The slurry can be kept in a suspension state under the action of the disturbance piece, and conditions are provided for the continuous growth of the aluminum hydroxide.
Drawings
FIG. 1 is a schematic view showing the structure of a horizontal continuous precipitation reaction apparatus in example 1;
FIG. 2 is a schematic view of the section H-H in FIG. 1;
FIG. 3 is a schematic structural view of a front end cap;
FIG. 4 is a schematic structural view of the rear end cap;
FIG. 5 is a schematic front view of a fluid flow perturber;
FIG. 6 is a schematic diagram of a side view of the structure of the liquid flow perturbing member, structure 1;
FIG. 7 is a schematic side view of the structure of the flow perturber, structure 2;
FIG. 8 is a schematic view showing the structure of a horizontal continuous precipitation reaction apparatus in example 2;
FIG. 9 is a schematic view of the structure at A in FIG. 8;
FIG. 10 is a schematic view showing the structure of a horizontal continuous precipitation reaction apparatus in example 3;
FIG. 11 is a schematic view of the structure at B in FIG. 10;
FIG. 12 is a topographical view of the aluminum hydroxide product.
Description of reference numerals: 1. the tank comprises a tank body, 2 heating sleeves, 3 front end covers, 4 rear end covers, 5 feed inlets, 6 discharge outlets, 7 heating medium inlets, 8 heating medium outlets, 9 acid-resistant layers, 10 upper reinforced guide plates, 11 liquid flow disturbance pieces, 12 accumulation preventing plates, 13 lower reinforced guide plates, 14 temperature measuring instruments, 15 vibration probes, 16 liquid flow direction changing protrusions, 17 supporting parts, 18 sealant, 19 reinforcing plates and 20 semicircular disturbance flow grooves.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific implementations, and all the portions of the present invention that are not described in detail are the prior art.
Example 1
A method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution comprises the steps of preparing materials including the aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter; mixing an aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter by a solution pump, and pumping the mixture into a horizontal reaction tank from a feed port 5 of the horizontal reaction tank, wherein the crystal growth promoter is sodium dodecyl sulfate, the addition amount of the crystal growth promoter is 400 ppm, and the growth of aluminum hydroxide particles is promoted by the action of the crystal growth promoter. An upper reinforced guide plate 10 which completely shields the upper half part of just half of an inner cavity and a lower reinforced guide plate 13 which completely shields the lower part of less than half of the inner cavity are alternately arranged in a tank body 1 of the horizontal reaction tank from a feed inlet 5 to a discharge outlet 6, the guide plate 10 and the tank body 1 are fixedly welded, the surface of the upper reinforced guide plate 10, the surface of the lower reinforced guide plate 13 and the inner wall of the tank body 1 are covered with an acid-resistant layer 9, the periphery of the tank body 1 is welded with a heating sleeve 2, the heating sleeve 2 and the tank body 1 form a sandwich structure, the sandwich structure is used for introducing a heating medium to heat materials in the tank body, the heating sleeve 2 is provided with a heating medium inlet 7 and a heating medium outlet 8, a mixed solution enters the discharge outlet 6 from the feed inlet 5 and reacts for 10 hours, the concentration of ammonium aluminum sulfate in the ammonium sulfate solution is 370g/L, the concentration of ammonia in the ammonia solution, the temperature of the reaction system is 30 ℃, and the pH of slurry flowing out of the discharge outlet is 6. And (3) performing solid-liquid separation on the outflow slurry to obtain solid and liquid, washing and drying the solid to obtain coarse-particle aluminum hydroxide, wherein the median diameter of the aluminum hydroxide particles is 40-70 mu m.
As shown in fig. 12, is a morphology chart of the prepared aluminum hydroxide product. FIG. 12a is a product topography map for a plurality of particles; FIG. 12b is a magnified surface topography of a single particle. The median diameter of the aluminum hydroxide particles is 40 to 70 mu m.
Example 2
A method for preparing coarse-grain aluminum hydroxide from an aluminum ammonium sulfate solution comprises the following steps of preparing materials including the aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter; mixing an aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter by a solution pump, and pumping the mixture into a horizontal reaction tank from a feed port 5 of the horizontal reaction tank, wherein the crystal growth promoter is sodium dodecyl benzene sulfonate, the addition amount of the crystal growth promoter is 600ppm, and the growth of aluminum hydroxide particles is promoted by the action of the crystal growth promoter. An upper reinforced guide plate 10 which completely shields the upper half part of exactly half of an inner cavity and a lower reinforced guide plate 13 which completely shields the lower part of less than half of the inner cavity are alternately arranged inside a tank body 1 of the horizontal reaction tank from a feed inlet 5 to a discharge outlet 6, the guide plate 10 and the tank body 1 are fixedly welded, the surface of the upper reinforced guide plate 10, the surface of the lower reinforced guide plate 13 and the inner wall of the tank body 1 are covered with an acid-resistant layer 9, a heating sleeve 2 is welded on the periphery of the tank body 1, the heating sleeve 2 and the tank body 1 form a sandwich structure, a heating medium is introduced into the sandwich structure to heat materials in the tank body, the heating sleeve 2 is provided with a heating medium inlet 7 and a heating medium outlet 8, the mixed solution enters the feed inlet 5 to the discharge outlet 6 and is discharged for 4 hours, the concentration of ammonium aluminum sulfate in the ammonium aluminum sulfate solution is 140 g/L, the concentration of ammonia in the ammonia solution is 25%, the temperature of the reaction system is 90 ℃, and the pH of slurry discharged from the discharge outlet is 9. And performing solid-liquid separation on the outflow slurry to obtain solid and liquid, washing and drying the solid to obtain coarse-particle aluminum hydroxide, wherein the median diameter of aluminum hydroxide particles is 40-70 mu m.
Example 3
A method for preparing coarse-grain aluminum hydroxide from an aluminum ammonium sulfate solution comprises the following steps of preparing materials including the aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter; mixing an aluminum ammonium sulfate solution and ammonia water with a crystal growth promoter by a solution pump, and pumping the mixture into a horizontal reaction tank from a feed inlet 5 of the horizontal reaction tank, wherein the crystal growth promoter is one or a mixture of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, the addition amount of the crystal growth promoter is 500 ppm, and the growth of aluminum hydroxide particles is promoted by the action of the crystal growth promoter. An upper strengthening guide plate 10 which completely shields the upper half part of just half of an inner cavity and a lower strengthening guide plate 13 which completely shields the lower part of less than half of the inner cavity are alternately arranged in a tank body 1 of the horizontal reaction tank from a feed inlet 5 to a discharge outlet 6, the guide plate 10 and the tank body 1 are welded and fixed, the surface of the upper strengthening guide plate 10, the surface of the lower strengthening guide plate 13 and the inner wall of the tank body 1 are covered with an acid-resistant layer 9, the periphery of the tank body 1 is welded with a heating sleeve 2, the heating sleeve 2 and the tank body 1 form a sandwich structure, the sandwich structure is used for introducing a heating medium to heat materials in the tank body, the heating sleeve 2 is provided with a heating medium inlet 7 and a heating medium outlet 8, a mixed solution enters the discharge outlet 6 from the feed inlet 5 to react for 7 hours, the concentration of ammonium aluminum sulfate in the ammonium sulfate solution is 255 g/L, the concentration of ammonia solution is 17.5%, the temperature of the reaction system is 60 ℃, and the pH of slurry flowing out of the discharge outlet is 7.5. And (3) performing solid-liquid separation on the outflow slurry to obtain solid and liquid, washing and drying the solid to obtain coarse-particle aluminum hydroxide, wherein the median diameter of the aluminum hydroxide particles is 40-70 mu m.
As shown in fig. 1, 2, 3, 4, 5 and 6, a tank body 1 of a horizontal reaction tank is of a horizontal structure, end covers are installed at two ends of the tank body 1 through bolts, each end cover comprises a front end cover 3 and a rear end cover 4, the front end cover 3 is provided with a feed inlet 5, the rear end cover 4 is provided with a discharge outlet 6, upper reinforcing guide plates 10 which completely shield the upper half part of just half of an inner cavity and lower reinforcing guide plates 13 which completely shield the lower part of less than half of the inner cavity are alternately arranged in the tank body 1 of the horizontal reaction tank from the feed inlet 5 to the discharge outlet 6, the guide plates 10 and the tank body 1 are fixedly welded, acid-resistant layers 9 are covered on the surfaces of the upper reinforcing guide plates 10, the surfaces of the lower reinforcing guide plates 13 and the inner walls of the tank body 1, included angles of the upper reinforcing guide plates 10 and the lower reinforcing guide plates 13 and the horizontal plane at the side of the rear end cover 4 are 30 to 90 °, liquid flow disturbance elements 11 are welded on the side of the upper reinforcing guide plates 10 and the lower reinforcing guide plates 13 and the side close to the front end cover the side of the rear end cover 3, and the surfaces of the liquid flow disturbance elements 11 are also covered with the acid-resistant layers 9. The cross section of an inner cavity of the tank body 1 is circular or elliptical, the diameter of a long shaft of the cross section is 500-3000 mm, the diameter ratio of the long shaft to a short shaft is 1-1.4, a front end cover 3 and a rear end cover 4 at two ends of the tank body 1 are circular or elliptical matched with the tank body, the length-diameter ratio of the tank body 1 is 1-20, the vertical distance from the uppermost end of a feed port 5 to the top of the inner cavity of the tank body 1 is 200-400mm, the vertical distance from the lowermost end of a discharge port 6 to the bottom of the inner cavity of the tank body 1 is 200-400mm, a liquid flow disturbance part is in a shape of strip-shaped plate intersection, the width of each intersected strip-shaped plate is 20-80mm, the upper and lower side intersection angles are larger than or equal to the intersection angles of the left side and the right side, and the included angles of the left side and the right side are 20-90 degrees; the overall thickness is 20 to 80mm, and the length is 0.25 to 0.50 times of the width of the reinforced guide plate. One side of each lower strengthening guide plate 13, which is close to the rear end cover 4, is provided with an anti-material-accumulation plate 12, one end of each anti-material-accumulation plate 12 is welded and connected to the rear end face of the lower strengthening guide plate 13, the other end of each anti-material-accumulation plate 12 is welded and connected to the inner wall of the tank body 1, and the exposed surface of each anti-material-accumulation plate 12 is provided with an acid-resistant layer 9. The acid-resistant layer 9 is formed by piling polytetrafluoroethylene coatings or acid-resistant bricks, and the thickness is 0.1 to 4mm. When the acid-proof brick is used, the acid-proof brick is a single-layer veneer, and the binder is acid-proof slurry. The upper reinforced guide plate 10 and the lower reinforced guide plate 13 are made of steel plates with the thickness of 4-10mm, the material accumulation preventing plate 12 is made of steel plates with the thickness of 4-10mm, the width of the material accumulation preventing plate 12 is equal to that of the lower reinforced guide plate 13, the highest point of the material accumulation preventing plate 12 is lower than the lowest point of the liquid flow disturbance element 11, and an included angle formed by the material accumulation preventing plate 12 and a horizontal plane on the side of the rear end cover 4 is 90-150 degrees. The distance between the adjacent upper reinforced guide plate 10 and the inner wall of the tank body 1 is 0.6 to 1.0 time of the width of the widest part in the tank body 1, and the distance between the adjacent lower reinforced guide plate 13 and the inner wall of the tank body 1 is 0.6 to 1.0 time of the width of the widest part of the lower reinforced guide plate 13.
Preferably, as shown in fig. 8 and 9, the upper reinforced guide plate 10 is a structure made of a steel plate and provided with an inner cavity, the upper side of the upper reinforced guide plate 10 penetrates through the tank body 1 and the heating jacket 2 and is provided with an opening, the upper reinforced guide plate 10 is welded with the tank body 1 and the heating jacket 2, the inner cavity of the tank body 1, the sandwich structure formed by the heating jacket 2 and the tank body 1 and the outer side of the heating jacket 2 are isolated, and a thermodetector 14 is inserted into the inner cavity of the upper reinforced guide plate 10, so that the temperature in the tank body 1 can be better monitored.
Further preferably, as shown in fig. 10 and 11, a vibration probe 15 is inserted into an inner cavity of the upper reinforced deflector 10 closest to the front end cover 3, preferably, an ultrasonic vibration generator is used, the vibration probe 15 can drive the inserted upper reinforced deflector 10 to vibrate, so as to reinforce the liquid flow in the tank body 1 to play a stirring role, and in addition, the ultrasonic field can also change the way of liquid precipitation and crystallization in the tank body, so as to generate singularity and improve the quality and yield of products. The upper part of the upper strengthening guide plate 10 inserted with the vibration probe 15 is provided with a supporting part 17, the periphery of the contact surface of the supporting part 17 and the heating jacket 2 is provided with a groove, and the groove is filled with high-temperature-resistant sealant 18, preferably high-temperature-resistant silicone sealant; one or more reinforcing plates 19 are welded and connected between the upper reinforced guide plate 10 inserted with the vibration probe 15 and the inner wall of the tank body 1; a liquid flow direction changing bulge 16 is welded between the lower reinforced guide plates 13 on the inner wall of the tank body 1, the surface of the liquid flow direction changing bulge 16 is also covered with an acid-resistant layer 9, and the liquid flow direction changing bulge 16 is arched and preferably semicircular.
Preferably, as shown in fig. 7, a plurality of concave semicircular turbulence grooves 20 are transversely arranged on one side of the liquid flow turbulence member 11 close to the front end cover 3.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and all embodiments cannot be exhaustive, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (6)
1. A method for preparing coarse-grain aluminum hydroxide from an aluminum ammonium sulfate solution is characterized by comprising the following steps: the preparation material comprises an aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter; mixing an aluminum ammonium sulfate solution, ammonia water and a crystal growth promoter through a solution pump, and pumping the mixture into a horizontal reaction tank from a feed inlet (5) of the horizontal reaction tank, wherein an upper strengthening guide plate (10) and a lower strengthening guide plate (13) are alternately arranged inside a tank body (1) of the horizontal reaction tank from the feed inlet (5) to a discharge outlet (6), the surface of the upper strengthening guide plate (10), the surface of the lower strengthening guide plate (13) and the inner wall of the tank body (1) are covered with an acid-resistant layer (9), a heating sleeve (2) is arranged on the periphery of the tank body (1), the heating sleeve (2) and the tank body (1) form a sandwich structure, the heating sleeve (2) is provided with a heating medium inlet (7) and a heating medium outlet (8), the mixed solution enters the feed inlet (5) to the discharge outlet (6) to be discharged for reaction for 4-10 hours, the flowing slurry is subjected to solid-liquid separation to obtain a solid and a liquid, and the solid is washed and dried to obtain coarse-particle aluminum hydroxide;
the tank body (1) of the horizontal reaction tank is of a horizontal structure, end covers are installed at two ends of the tank body (1), each end cover comprises a front end cover (3) and a rear end cover (4), a feed inlet (5) is formed in the front end cover (3), a discharge outlet (6) is formed in the rear end cover (4), an included angle between an upper reinforced guide plate (10) and a lower reinforced guide plate (13) and a horizontal plane on the side of the rear end cover (4) is 30-90 degrees, a liquid flow disturbing piece (11) is arranged on the side, close to the front end cover (3), of the upper reinforced guide plate (10) and the lower reinforced guide plate (13), and an acid-resistant layer (9) covers the surface of the liquid flow disturbing piece (11);
the inner wall of the tank body (1) is positioned between the lower reinforced guide plates (13) and is provided with liquid flow direction changing bulges (16), the surface of each liquid flow direction changing bulge (16) is also covered with an acid-resistant layer (9), each liquid flow direction changing bulge (16) is arched, each upper reinforced guide plate (10) is of a structure which is made of a steel plate and is provided with an inner cavity, the upper side of each upper reinforced guide plate (10) penetrates through the tank body (1) and the heating sleeve (2) and is provided with an opening, each upper reinforced guide plate (10) is welded with the tank body (1) and the heating sleeve (2), the inner cavity of the tank body (1), the sandwich structure formed by the heating sleeve (2) and the tank body (1) and the outer side of the heating sleeve (2) are isolated, and a temperature measuring instrument (14) is inserted into the inner cavity of each upper reinforced guide plate (10);
a vibration probe (15) is inserted into the inner cavity of the upper reinforced guide plate (10) closest to the front end cover (3);
the upper part of the upper strengthening guide plate (10) inserted with the vibration probe (15) is provided with a supporting part (17), the periphery of the contact surface of the supporting part (17) and the heating sleeve (2) is provided with a groove, the groove is filled with high-temperature resistant sealant (18), and the high-temperature resistant sealant (18) is high-temperature resistant silicone sealant; one or more reinforcing plates (19) are connected between the upper reinforced guide plate (10) inserted with the vibration probe (15) and the inner wall of the tank body (1); a plurality of concave semicircular turbulence grooves (20) are transversely arranged on one side of the liquid flow disturbing piece (11) close to the front end cover (3);
the vibration probe (15) is an ultrasonic vibration generator.
2. The method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution according to claim 1, characterized in that: the concentration of the aluminum ammonium sulfate in the aluminum ammonium sulfate solution is 140-370 g/L, the concentration of ammonia in the ammonia water solution is 10-25%, the temperature of the reaction system is 30-90 ℃, and the pH value of slurry flowing out of the discharge hole is 6-9.
3. The method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution according to claim 1, characterized in that: the crystal growth promoter is one or a mixture of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, and the addition amount of the crystal growth promoter is 400-600 ppm.
4. The method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution according to claim 1, characterized in that: the cross section of the inner cavity of the tank body (1) is circular or oval, the diameter of the long axis of the cross section is 500-3000 mm, the ratio of the diameter of the long axis to the diameter of the short axis is 1-1.4, the front end cover (3) and the rear end cover (4) at two ends of the tank body (1) are circular or oval matched with the tank body, the length-diameter ratio of the tank body (1) is 1-20, the vertical distance from the uppermost end of the feed inlet (5) to the top of the inner cavity of the tank body (1) is 200-400 mm, the vertical distance from the lowermost end of the feed outlet (6) to the bottom of the inner cavity of the tank body (1) is 200-400 mm, the liquid flow disturbance element is in the shape of crossed strip plates, the width of each crossed strip plate is 20-80 mm, the crossing angle of the upper side and the lower side is greater than or equal to the crossing angle of the left side and the right side, and the included angle of the left side and the right side is 20-90 degrees; the whole thickness is 20-80 mm, and the length is 0.25-0.50 times of the width of the reinforced guide plate.
5. The method for preparing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution according to claim 1, characterized in that: one side of each lower reinforcing guide plate (13) close to the rear end cover (4) is provided with an anti-material-accumulation plate (12), one end of each anti-material-accumulation plate (12) is connected to the rear end face of the lower reinforcing guide plate (13), the other end of each anti-material-accumulation plate (12) is connected to the inner wall of the tank body (1), and the surface of each anti-material-accumulation plate (12) exposed outside is provided with an acid-resistant layer (9).
6. The method for producing coarse-grained aluminum hydroxide from an aluminum ammonium sulfate solution according to claim 1 or 5, characterized in that: the acid-resistant layer (9) is formed by piling polytetrafluoroethylene coatings or acid-resistant bricks, and the thickness is 0.1-4 mm.
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