CN112742302A

CN112742302A - Aluminum oxide powder granulator

Info

Publication number: CN112742302A
Application number: CN202110017716.2A
Authority: CN
Inventors: 黄超; 原周; 刘滨; 王红果; 蔡丽
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-05-04

Abstract

The invention relates to the technical field of granulation, in particular to an alumina powder granulator, which is characterized in that a tank body is arranged on a frame, a ventilation cavity is connected with the tank body through a connecting edge and a mounting opening, the upper wall of the ventilation cavity is connected with a spray head to form a whole, the ventilation cavity is convenient to disassemble and mount in a unified manner and is convenient to maintain, a dust collection cover is arranged, the dust collection cover is connected with an exhaust pipe and is used for discharging humid air, alumina particles fall downwards into a discharge pipe and roll down in the discharge pipe through the discharge pipe, adhesion can be reduced and avoided, the pipeline is a spiral pipeline, the pipeline is vibrated by a vibration starting device to play a role of loosening and further avoiding adhesion, moisture of the alumina particles is dissipated during use, humid hot air rises, the exhaust pipe is connected to a cyclone dust collector to discharge alumina powder and collect dust, and micro negative pressure can be formed in the tank body, avoid causing the raise dust when passing through the discharging pipe ejection of compact.

Description

Aluminum oxide powder granulator

Technical Field

The invention relates to the technical field of granulation, in particular to an alumina powder granulator.

Background

The production process of alumina powder is higher and higher in industrial production nowadays, and alumina powder with the particle size of less than 1 micron can be produced. The nano-scale alumina transparent liquid is colorless and transparent, 5-10 nm alumina is used in the nano-scale alumina transparent dispersion liquid, the alumina is obtained by screening nano-scale alumina through deep processing layer by layer, the nano-scale alumina is added into aqueous liquid of various resins such as acrylic resin, polyurethane resin, melamine resin, silicone-acrylic emulsion and the like, the addition amount is 5-10%, the hardness of the resin can be improved, the hardness can reach 6-8H, the nano-scale alumina transparent liquid is completely transparent, the nano-scale alumina liquid can be any aqueous or oily solvent, and meanwhile, the nano-scale alumina transparent dispersion liquid can be used as various glass coating materials, jewels, precision instrument materials and the like. However, in the further processing of alumina powder, alumina powder is mostly required to be made into particles, and the existing preparation methods of alumina powder granules have many problems, such as mechanical mixing method, sol-gel method, hydrothermal synthesis method, multiphase suspension emulsion mixing method, precipitation wrapping method, sol-suspension mixing method, etc., but the problems of poor particle image, uneven distribution, etc., exist in most of the existing methods, and if the humidity is too high in the process of alumina granulation, the particles are in a semi-dry state, which causes adhesion and accumulation of finished alumina particles, greatly affects the quality of products.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides an alumina powder granulator which is convenient to maintain and stable in drying.

The invention is realized by the following technical scheme: an alumina powder granulator comprises a frame, wherein a vertical tank body is arranged on the frame, a spray head used for being communicated with a slurry tank is arranged at the upper end of the tank body, the nozzle is provided with a ventilation cavity communicated with a hot air source, the upper end of the tank body is provided with a mounting port for mounting the ventilation cavity, the outer edge of the ventilation cavity is provided with a connecting edge which is used for being connected with the mounting hole in a sealing way, the outlet of the ventilation cavity is arranged around the spray head, the upper wall of the ventilation cavity is hermetically connected with the spray head, a dust hood is arranged in the tank body close to the lower end, the dust hood is connected with an exhaust pipe which extends to the outside of the tank body, the lower end of the tank body is provided with a discharge pipe, the discharging pipe is a spiral pipe, a vibration starting device is arranged at the lower end of the spiral pipe, a discharging pipe with a valve is arranged at the tail end of the discharging pipe, and a material receiving box is arranged on the lower side of the discharging pipe.

Furthermore, the shower nozzle is the back taper structure, shower nozzle lower extreme outer wall is provided with a plurality of orifices in a row, shower nozzle upper end intermediate position is provided with the inlet pipe, the upper wall in ventilation chamber is provided with the go-between with shower nozzle up end sealing connection.

Furthermore, an air distribution pipe is arranged at the upper end of the ventilation cavity, the air distribution pipe is communicated with the ventilation cavity through a plurality of manifolds which are uniformly distributed, and the air distribution pipe is communicated to a hot air source.

Furthermore, a turbulence device for forming airflow convolution in the tank body is arranged in the middle of the tank body and comprises a main air pipe arranged around the outside of the tank body, the main air pipe is communicated with a hot air source, and a plurality of short pipes communicated to the tank body are uniformly arranged on the main air pipe.

Furthermore, a guide plate is arranged at a position corresponding to the main air pipe in the tank body, the guide plate is annular, the cross section of the guide plate is arc-shaped, the opening of the guide plate points to the inner wall of the tank body, and a support rod used for being inserted into the short pipe outwards is connected to the guide plate.

Further, a sealing groove used for being connected with the packaging bag is formed in the discharging pipe, and an elastic pressing ring is arranged at the sealing groove.

The invention has the beneficial effects that: alumina powder granulator, install the jar body in the frame, the chamber of ventilating is through the joint edge, installing port and jar body coupling, the upper wall in chamber of ventilating is connected with the shower nozzle, and then form a whole, convenient unified dismantlement and installation, it is convenient to maintain, set up the dust cage, the exhaust pipe is connected to the dust cage, be used for discharging humid air, alumina grain falls into the discharging tube downwards, through the discharging pipe, roll off in the discharging tube, can reduce and avoid the adhesion, the pipeline is the helical duct, through the device that shakes, can play loose effect, and then avoid gluing, in-process when using, alumina grain moisture scatters and disappears, humid hot air rises, the exhaust pipe is connected to cyclone can be with the discharge that contains alumina powder, carry out the dust collection, can make the internal micro negative pressure that forms of jar, arouse the raise dust when avoiding passing through the discharging pipe ejection of compact.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a schematic view of a connection structure of the nozzle and the ventilation chamber;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is a schematic front view of a discharge pipe;

wherein: 1-frame, 2-blower, 3-heater, 4-tank, 5-air inlet pipe, 6-pressure regulating valve, 7-ventilation cavity, 8-inlet pipe, 9-nozzle, 10-main air pipe, 11-dust collection hood, 12-exhaust pipe, 13-outlet pipe, 14-vibration motor, 15-discharge pipe, 16-material receiving box, 17-air distribution pipe, 18-baffle ring, 19-connecting edge, 20-manifold, 21-helical blade, 22-connecting ring, 23-spray hole, 24-guide plate, 25-support rod, 26-short pipe, 27-valve, 28-sealing groove, and 29-elastic pressure ring.

Detailed Description

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1-4, the alumina powder granulator has an irregular shape and different sizes of alumina extracts, before the alumina granulation is performed, the alumina extracts need to be processed by a ball mill to form fine alumina powder, the alumina powder is subjected to slurry mixing, heating, additive addition, and then a conveying pump is used to pump the mixed solution of alumina to the granulator for spray drying, and the mixed solution of alumina is dried into granules which are collected to obtain alumina powder granules.

Adding alumina powder of the alumina extract after being treated by the ball mill into a stirring bin, stirring the concentration of slurry in the stirring bin to be 50-60%, wherein the average fineness particle size of the slurry is 1.5-5 mu m, and the residue of a 325-mesh sieve is less than 1%. And when the alumina powder in the stirring bin is stirred, additives such as an adhesive, a dispersant, a defoaming agent, a lubricant and the like are required to be added, the adhesive is a polyvinyl alcohol (PVA) aqueous solution, the polymerization degree of the PVA is preferably 1400-2400, the PVA can be completely volatilized by high-temperature sintering, and is free of ash content, and the PVA is dissolved in water by heating, and the using amount is 0.7-2.5%. The adhesive also contains carboxymethyl cellulose (CMC) aqueous solution, the residual Na2O and other ash content of CMC after high-temperature sintering are generally less than 15%, and the CMC is heated and dissolved in water with the dosage of 0.5% -2%. The dispersant can be divided into inorganic dispersant and organic dispersant, wherein the inorganic dispersant comprises water glass, sodium hexametaphosphate, potassium carbonate and the like, the addition amount is generally more than 1%, the organic dispersant comprises organic hydrochloric acid and polymer electrolyte, such as sodium tannate, triethanolamine, sodium polyacrylate and the like, and the addition amount of the common polymer electrolyte is smaller. The amount of the dispersant to be added may be determined depending on the concentration and viscosity of the slurry, or may be omitted. The defoaming agent mainly comprises alcohols, esters, surfactants and the like. The lubricant mainly comprises oleic acid, emulsified paraffin, glycerol, etc. Wherein the defoaming agent and the lubricant can be added in proper amount according to the concentration and viscosity of the slurry in the stirring bin. The additive is completely dissolved in water and then added into the slurry, and undissolved additive micelles cannot be completely dissolved in the slurry, so that the component proportion of the slurry is different, the particle forming hardness is not enough in the subsequent granulation process, the granular alumina particles cannot be formed, and the product quality is seriously influenced. The inlet temperature of the granulator is less than 500 degrees celsius when the slurry is delivered to the granulator by the delivery pump, and the outlet temperature is greater than 95 degrees celsius to avoid the phenomenon of non-drying of the alumina particle cores, and may be dependent on the moisture content of the slurry. And the diameter of a nozzle at the slurry outlet in the granulator is 0.7-1.5mm, so that the diameter of the formed alumina powder particles cannot be too large or too small, and the internal pressure of the granulator is kept between-200 Pa and-300 Pa.

The invention is to stir an alumina block ground by a ball mill by a stirrer for stirring alumina powder to obtain slurry, further granulate the alumina powder, and a delivery pump for delivering alumina powder slurry to the granulator, wherein the delivery pump delivers the slurry to the granulator through a pipeline, the granulator comprises a frame 1, the frame is a steel frame, a vertical tank body 4 is arranged on the frame, the tank body is manufactured by seamless welding, the lower end of the tank body is inverted cone-shaped, the upper end of the tank body is provided with a spray head 9 for communicating with the slurry tank, specifically, the spray head is an inverted cone-shaped joint and is made of stainless steel materials and is welded in a sealing way, the outer wall of the lower end of the spray head is provided with a plurality of spray holes 23 in rows and columns, the spray holes are 0.7mm-1.5mm, an upward feeding pipe 8 is welded at the middle position of the spray head according to different alumina powder, the aperture of the feeding hole is smaller than the inner diameter of the feeding pipe, a spiral blade 21 is inserted into a discharging pipe of the feeding pipe, mixed flow can be carried out, and further slurry is uniform, a ventilation cavity 7 used for being communicated with a hot air source is installed at the position of the spray head, a connecting ring 22 hermetically connected with the upper end face of the spray head is integrally formed on the upper wall of the ventilation cavity, the connecting ring and the upper end face of the ventilation cavity are fixed through welding and coated with sealant, an annular air outlet is formed between the lower end of the ventilation cavity and the lower end of the spray head, further, the slurry is uniformly dried, and the slurry is uniformly formed into balls, because the spray head needs to be maintained in the using process, a supporting plate is welded on the upper end face of the ventilation cavity, the supporting plate extends to the outer part of the ventilation cavity to form a connecting edge 19, a mounting opening used for mounting the ventilation cavity is reserved at the upper end of the tank, install cloth tuber 17 in the chamber upper end of ventilating, a plurality of manifolds 20 through evenly distributed communicate between cloth tuber and the ventilation chamber, the cloth tuber communicates to hot air source, hot air source is including installing air-blower 2 in the frame, the play tuber pipe of air-blower is connected with heater 3, the heater is electric heater, improve the air-out temperature to about 450 ℃, the heater passes through air-supply line 5 and cloth tuber intercommunication, install air-vent valve 6 on the air-supply line, and then control the wind speed, at the in-process of maintaining, can be with ventilation chamber and shower nozzle, the cloth tuber pipe is whole to be demolishd, remove to spacious department and maintain the shower nozzle, convenient operation.

The feeding pipe 8 is communicated to the slurry tank through a metering pump.

The internal portion of jar is close to the lower extreme position and is installed dust cage 11, and the dust cage opening is downward, and the dust cage is connected with exhaust pipe 12, and the exhaust pipe extends to jar external portion and is connected with cyclone, can collect the alumina grain in the air current, avoids polluting, material saving.

Jar body lower extreme intercommunication has discharging pipe 13, and the discharging pipe is the spiral pipe, and the start device that shakes is installed to the spiral pipe lower extreme, and the start device that shakes is vibrating motor 14, and vibrating motor installs in the discharging pipe and is close to the position of lower extreme, can reduce the influence to the jar body, and the alumina powder rolls down in the spiral pipe, and dispersion that can be further avoids bonding, through vibrating motor start shake, can promote the dispersion effect.

The discharge pipe 15 with the valve 27 is arranged at the tail end of the discharge pipe, the discharge pipe is provided with a sealing groove 28 used for being connected with a packaging bag, an elastic pressing ring 29 is sleeved at the sealing groove, the packaging bag of the alumina powder is usually sealed by the sealing bag, the bag has good moisture-proof effect, the bag body has good elasticity, a bag opening is sleeved on the discharge pipe during filling, then the bag body is sealed with the discharge pipe through the matching of the elastic pressing ring and the sealing groove, the connection is convenient, the contact of personnel is reduced, a material receiving box 16 is arranged at the lower side of the discharge pipe and is connected with a traveling wheel, the bag body is arranged in the material receiving box, the valve is closed after filling is completed, the elastic pressing ring is moved upwards, the bag body can be taken down, the operation is convenient, the elastic pressing ring is a rubber ring, in order to prevent the rubber ring from being separated, in this embodiment, the seal groove has two, and upper and lower distribution is used for fixing the elasticity clamping ring temporarily in last seal groove, avoids interfering when the suit with remove the wrapping bag.

In the using process, the problem that the inner wall of the tank body is adhered with powder due to low temperature at the wall of the tank body, scabbing occurs for a long time and product quality is affected is solved, in the embodiment, a turbulence device for forming airflow whirling in the tank body is arranged at the middle position of the tank body, the turbulence device comprises a main air pipe 10 arranged around the outside of the tank body, the main air pipe is communicated with a hot air source, a plurality of short pipes 26 communicated with the tank body are uniformly arranged on the main air pipe, airflow with different direction from the original airflow is formed in the tank body through the turbulence device, turbulence is further formed, the dispersion effect can be improved, meanwhile, the temperature at the wall of the tank body can be improved, powder adhesion is reduced, in order to further improve the effect, a guide plate 24 is arranged at the position corresponding to the main air pipe in the tank body, the guide plate is annular, the, the air-out that can make the vortex device through the guide plate is more even, the air-out that can make the vortex device simultaneously is along jar internal wall, and then can heat the tank wall, it is even to reduce the powder, can also form the air curtain in tank wall department, prevent powder contact jar internal wall, be connected with the bracing piece 25 that is used for outwards inserting the stub on the guide plate, at the in-process of installation, make the guide plate of multistage earlier, fixed support bar on the guide plate, then move to jar internal the assembling, convenient preparation.

Before granulation, the tank body is preheated in advance to enable the temperature in the ventilation pipeline to reach about 500 ℃, a cyclone dust collector is started to pump the tank body into negative pressure, a pressure gauge arranged on the tank body displays-200 to-300 Pa, slurry is conveyed into the granulator through a metering pump, the slurry is sprayed out through a spray head and is heated and dried through hot air at about 500 ℃ in the ventilation cavity to form alumina particles, and the granulation device is high in working stability and convenient to operate.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. An alumina powder granulator is characterized in that: the improved slurry tank comprises a frame, be provided with vertical jar of body in the frame, jar body upper end is provided with and is used for communicateing the shower nozzle to the slurry tank, shower nozzle department is provided with the ventilation chamber that is used for communicateing to hot air source, jar body upper end is provided with the installing port that is used for installing the ventilation chamber, the outer fringe in ventilation chamber is provided with and is used for the joint edge with installing port sealing connection, the export in ventilation chamber encircles the shower nozzle setting, the upper wall and the shower nozzle sealing connection in ventilation chamber, jar internal portion is close to the lower extreme position and is provided with the dust cage, the dust cage is connected with the exhaust pipe, the exhaust pipe extends to a jar external portion, jar body lower extreme is provided with the discharging pipe, the discharging pipe is the spiral pipe, the spiral pipe lower extreme is provided with the device that shakes, the.

2. An alumina powder granulator as claimed in claim 1, characterized in that: the shower nozzle is the back taper structure, shower nozzle lower extreme outer wall is provided with a plurality of orifices in line, shower nozzle upper end intermediate position is provided with the inlet pipe, the upper wall in ventilation chamber is provided with the go-between with shower nozzle up end sealing connection.

3. An alumina powder granulator as claimed in claim 1, characterized in that: the upper end of the ventilation cavity is provided with an air distribution pipe, the air distribution pipe is communicated with the ventilation cavity through a plurality of manifolds which are uniformly distributed, and the air distribution pipe is communicated to a hot air source.

4. An alumina powder granulator as claimed in claim 1, characterized in that: the utility model discloses a heat exchanger, including jar body, vortex device, main tuber pipe, hot gas source, jar body intermediate position is provided with the vortex device that is used for making jar internal formation air current to revolve round, the vortex device is including surrounding the main tuber pipe that sets up in jar external portion, main tuber pipe and hot gas source intercommunication, evenly be provided with a plurality of nozzle stub that communicate to jar body on the main tuber pipe.

5. An alumina powder granulator as claimed in claim 1, characterized in that: the utility model discloses a short tuber pipe, including jar body, guide plate cross section, be connected with the bracing piece that is used for outwards inserting in the stub pipe on the guide plate, the jar is internal to be provided with the guide plate with the corresponding position department of main tuber pipe, the guide plate is cyclic annular, the guide plate cross section is arc and the directional internal wall of jar of opening, be connected.

6. An alumina powder granulator as claimed in claim 1, characterized in that: the discharging pipe is provided with a sealing groove used for being connected with the packaging bag, and an elastic pressing ring is arranged at the sealing groove.