CN110092395B - Sodium hydroxide production method - Google Patents
Sodium hydroxide production method Download PDFInfo
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- CN110092395B CN110092395B CN201910453538.0A CN201910453538A CN110092395B CN 110092395 B CN110092395 B CN 110092395B CN 201910453538 A CN201910453538 A CN 201910453538A CN 110092395 B CN110092395 B CN 110092395B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
- C01D1/22—Preparation by reacting oxides or hydroxides with alkali metal salts with carbonates or bicarbonates
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Abstract
The invention belongs to the technical field of sodium hydroxide preparation, and particularly relates to a sodium hydroxide production method, which adopts a sodium hydroxide preparation device, wherein the device comprises a box body, a cylinder, a grinding cutter unit, a blanking plate, a mixing and stirring unit, a motor, a throwing cavity, a first belt wheel, a second belt wheel, a belt, a hinge seat, a connecting rod, a crushing unit and a first gear; the output end of the air cylinder is hinged with the grinding cutter unit; the throwing cavity is fixedly arranged on the outer wall of the box body; the mixing and stirring unit is arranged on the inner wall of the box body; the mixing and stirring unit is arranged in the box body; can directly carry out a lot of grinding with natural soda through the device and smash for the raw materials refines, makes the reaction fast and mixes back solution, adds lime cream and takes place causticization reaction and combine together, utilizes lime cream to meet the water and gives off a large amount of heats, satisfies the temperature requirement of causticization reaction just, thereby the sodium hydroxide solution of system is convenient for further prepare the caustic soda finished product.
Description
Technical Field
The invention belongs to the technical field of sodium hydroxide preparation, and particularly relates to a sodium hydroxide production method.
Background
In chemical and metallurgical production, sodium hydroxide solution is a common raw material, in the current industrial production, sodium hydroxide is generally produced by electrolyzing sodium chloride solution, most of the existing production equipment uses carbon rods as electrodes, the electrolysis efficiency of the mode is very low, the content of heavy metals such as lead, mercury and the like in the produced product is high, and the high-concentration sodium hydroxide solution produced in a low-temperature environment is easy to crystallize in the conveying process, so that the pipeline is prevented from being blocked by the sodium hydroxide solution by crystallization at a low temperature, the pipeline is usually conveyed by a heat-insulating pipeline at present, but the method causes the maintenance cost of the conveying equipment to be very high, once the pipeline is blocked by crystals, the treatment operation is very complicated, and the normal production is influenced.
Some technical schemes for producing sodium hydroxide also appear in the prior art, for example, a chinese patent with application number 2015108871768 discloses a method for producing sodium hydroxide; a sodium hydroxide production method comprises the following steps; 1, connecting a junction box with a power supply; 2, respectively connecting the hydrogen pipe, the chlorine pipe, the feeding pipe and the water inlet pipe with corresponding supply pipelines and collecting pipelines, and then connecting the outlet of the heating pipe with a sodium hydroxide collecting device through a pipeline; 3, opening a water inlet valve and a feed valve to enable the sodium chloride solution and water to enter the electrolytic tank body, and closing the water inlet valve and the feed valve when the solution in the electrolytic tank body reaches a proper position; 4, opening a power supply of the junction box, starting electrolysis, and simultaneously opening a hydrogen pipe valve and a chlorine pipe valve; 5, opening a heating switch of the heater after electrolyzing for a period of time; 6 then opening a discharge valve and an extraction pump switch;
although the technical scheme has the advantages of simple production method, low cost, easy realization of industrial production of sodium hydroxide and the like, the production method has insufficient reaction contact, can not improve the quality of the generated sodium hydroxide and has low conversion efficiency; to this end, we propose a sodium hydroxide production process to solve the above problems.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a sodium hydroxide production method, wherein a sodium hydroxide preparation device used in the method utilizes a grinding cutter to grind and crush a large amount of trona, crushed and refined raw materials enter the bottom of the device to be fully mixed with water, and lime milk is added to carry out causticization reaction by matching with the rotation of a spiral plate, so that a sodium hydroxide solution is prepared, and the sodium hydroxide solution is convenient for further preparing a finished product of caustic soda.
The technical scheme adopted by the invention for solving the technical problems is as follows: a process for the production of sodium hydroxide, the process comprising the steps of:
s1: adding trona directly into a sodium hydroxide preparation device, grinding and crushing by using a grinding knife, enabling crushed solid particles to enter the bottom of the device through small blanking holes to be dissolved in water, fully stirring until the solid particles are dissolved, and standing until the solution is clear;
s2: adding quicklime into a feeding cavity of a device in S1, carrying an aqueous solution into the bottom of the feeding cavity by the rotation of a water wheel to react with the quicklime to generate lime milk [ Ca (OH)2] and discharging a large amount of heat, so that the solution is causticized in an environment with the temperature of 95-100 ℃;
s3: standing the causticized solution until the solution is clear, evaporating and concentrating until the concentration of sodium hydroxide is 46%, separating out partial solids, discharging the solution, cooling the discharged solution, and facilitating further evaporation and concentration to prepare a solid caustic soda finished product;
the sodium hydroxide preparation device in S1 comprises a box body, a cylinder, a grinding cutter unit, a blanking plate, a mixing and stirring unit, a motor, a throwing cavity, a first belt wheel, a second belt wheel, a belt, a hinge seat, a strip-shaped connecting rod, a crushing unit and a first gear; the box body is a cuboid hollow shell type, two trapezoidal holes which are symmetrical along the center are formed in the top end of the box body and used for putting natural alkali, and an air cylinder is fixedly installed in the center of the inner side of the top of the box body; the output end of the air cylinder is hinged with the grinding cutter unit; the grinding cutter unit comprises a grinding cutter, a conical hole, a second gear and grinding bulges, wherein the grinding cutter is in a hook shape and is bilaterally symmetrical along the center, the upper end of the grinding cutter is provided with a hinge hole, the lower end of the grinding cutter is in a circular arc shape, the surface of the circular arc end of the grinding cutter is provided with a plurality of grinding bulges, the bottom of the hook-shaped part is provided with the conical hole, one side of the conical hole is provided with a cavity, and a crushing unit is arranged in the cavity; the blanking plate is arc-shaped, a groove is formed in the blanking plate, a grinding knife can grind and crush the blanking plate in the middle conveniently, a plurality of trapezoidal blanking small openings are formed in the lower end of the blanking plate, and the blanking plate is fixedly connected to the inner wall of the box body and located below the grinding bulges; the feeding cavity is in a funnel hollow shell shape, the bottom of the feeding cavity is provided with a plurality of small holes, the feeding cavity is fixedly arranged on the outer wall of the box body, and the other end of the feeding cavity extends into the box body and is positioned below the blanking plate; the mixing and stirring unit is arranged on the inner wall of the box body and is positioned below the throwing cavity, the left end of the mixing and stirring unit is connected with a motor arranged on the outer wall of the box body, and the right end of the mixing and stirring unit is connected with a first belt wheel; the second belt wheel is positioned above the first belt wheel and connected with the first belt wheel through a belt, and the second belt wheel is hinged with a hinge seat fixedly arranged on the outer wall of the box body; the long strip-shaped connecting rod is hinged with the hook-shaped part of the grinding cutter, the other end of the long strip-shaped connecting rod extends out of the box body and is fixedly connected to the wheel side of the second belt wheel to form an offset distance with the rolling axis, so that the grinding cutter can be driven to shake to grind; through the mutual matching of the box body, the air cylinder, the grinding cutter unit, the blanking plate, the mixing and stirring unit, the motor, the throwing cavity, the first belt wheel, the second belt wheel, the belt, the hinge seat, the connecting rod, the grinding unit and the first gear, the grinding and grinding are more thorough, the convenience and the high efficiency are realized, and the cost is saved; when the device works, the trona raw material is directly added into the device through the trapezoid hole, most of the added trona is accumulated on the hook-shaped part of the grinding cutter, and a small part of the raw material directly falls into the blanking plate through the tapered hole; at the moment, the air cylinder pushes the grinding cutter unit to move downwards, the grinding bulge carries out direct primary crushing treatment on the raw materials falling into the blanking plate, and partial refined raw materials fall into the bottom of the device through a small blanking opening; after the motor is started, the mixing and stirring unit is driven to rotate, so that the raw materials and the aqueous solution are fully mixed, and after standing is carried out until the solution is clarified, quicklime can be put into the putting cavity; because the motor also drives the band pulley rotatory simultaneously, makes the band pulley rotatory No. two through belt drive, is the same with eccentric cam principle to drive the grinding tool horizontal hunting, just like the drugstore grinds the medicinal material, can grind the crushing a large amount of trona raw materials fast, this is the most main once grinding, grinds the minification and also is the most, and No. one gear and No. two gears are in the engaged state this moment, are convenient for carry out transmission on next step.
Preferably, the tapered holes are in a shape with a large top and a small bottom and are symmetrically distributed along the center of the cutter; the conical holes can slow down the falling speed of the trona, so that the grinding and crushing are more thorough, and the raw materials are refined; when the trona raw materials are put into the box body once, in order to avoid the raw materials from directly participating in mixing without grinding, crushing and refining, the cone holes are arranged to intercept part of the raw materials, so that the descending speed of the raw materials is reduced, and the subsequent extrusion work of the raw materials is facilitated.
Preferably, a crushing unit is arranged in a cavity on one side of the tapered hole; the grinding cutter unit swings left and right to enable the first gear and the crushing unit to be in meshing transmission; the crushing unit comprises a second gear, a first transmission rod and a second transmission rod; the second gear is arranged on the cavity shaft and is rotationally connected with the first transmission rod, and after the grinding cutter descends, the second gear is in meshing transmission with the first gear to drive the first transmission rod to rotate; the second transmission rod is in a strip shape, three grooves are formed in the left side of the second transmission rod, the upper end of the second transmission rod is hinged with the first transmission rod, and the lower end of the second transmission rod is hinged with the grinding cutter; the fan-shaped hob is arranged in the groove; the taper size of the tapered hole is further changed through the matched motion among the second gear, the first transmission rod, the second transmission rod and the fan-shaped hob, the raw material is pressed, the movement of the raw material is accelerated, and the raw material is crushed and refined; when the first gear and the second gear are in a meshed state, the rotation of the second gear drives the fixedly connected first transmission rod to rotate, and further drives the second transmission rod to rotate; the volume of the conical hole can be changed due to the rotation of the second transmission rod, and meanwhile, the trona raw material in the conical hole is extruded and crushed for the second time and is accelerated to move downwards.
Preferably, a fan-shaped hob is rotatably arranged in a groove of the second transmission rod; the fan-shaped hob is fan-shaped and comprises a blade and a cylindrical body; the four blades are uniformly distributed along the cylindrical body; the falling of the raw materials is accelerated through the unidirectional rotation of the fan-shaped hob, and the raw materials are prevented from splashing upwards; can drive fan-shaped hobbing cutter when No. two drive bars press the raw materials and carry out single direction rotation, because the blade is the circular arc shape, can push down the raw materials of part crushing during the rotation, avoid the raw materials upwards to splash and prevent the jam of passageway, carry out the grinding of third time to the raw materials simultaneously and refine.
Preferably, the blade is in a circular arc shape and comprises a blade holder, a blade tip and an electric push rod; the cutter holder is hinged with the cutter tip; the input end of the electric push rod is fixedly connected with the cutter holder, and the output end of the electric push rod is hinged with the hinge seat at the inner side of the cutter tip; through the mutual matching among the cutter seat, the cutter tip and the electric push rod, the rotation of the cutter tip is utilized to extrude the raw materials, so that the crushing of the raw materials is accelerated; when the fan-shaped hob is rotated and rotated, the electric push rod works, when the output end of the electric push rod retracts backwards, the space between the cutter point and the cutter holder is changed, the raw materials can be compressed and refined again, the rotation of the second transmission rod is matched, the grinding and refining speed of the raw materials can be greatly increased, and the blockage of a channel is prevented.
Preferably, the mixing and stirring unit comprises a water wheel and a spiral plate, wherein the water wheel is arranged at the output end of the motor; the spiral plate is arc-shaped, is welded at the output end of the motor and is positioned on the right side of the water wheel; the water wheel rotates to enable the water solution to enter the putting cavity from the small hole to react with the quicklime, the spiral plate rotates to stir to generate lime milk and release a large amount of heat to accelerate the causticization reaction, and preparation is made for preparing a caustic soda finished product; after the ground and refined trona raw material falls into the bottom of the tank body through the leak hole and is mixed with water, the trona raw material is kept stand to a clear solution, quicklime is put in from the putting cavity, the motor is started to drive the water wheel to rotate, so that the water solution enters the putting cavity from the leak hole and reacts with the quicklime, and the lime is stirred by the spiral plate to generate lime milk and emit a large amount of heat, so that the temperature requirement of causticization reaction is just met, and the sodium hydroxide solution is prepared so as to further prepare a caustic soda finished product.
The invention has the beneficial effects that:
1. according to the production method of sodium hydroxide, the trona raw materials are directly put into a device, and a large amount of trona raw materials are directly ground, crushed and refined through the grinding and crushing of the grinding knife, so that the raw materials and water can be conveniently and fully mixed.
2. The blanking plate, the crushing unit and the fan-shaped hob are arranged in the sodium hydroxide production method, and are used for further grinding and crushing the trona, so that raw materials are refined, a solution after reaction and mixing can be quickly prepared, and a foundation is laid for preparing sodium hydroxide in the next step.
3. The sodium hydroxide production method provided by the invention is characterized in that ground and crushed raw materials are dissolved by adding water, quicklime is added to react with an aqueous solution to generate lime milk, a large amount of heat is discharged, and the temperature requirement of a causticization reaction is just met, so that a sodium hydroxide solution is prepared, and the caustic soda finished product is further conveniently prepared.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a sectional isometric view of a sodium hydroxide production apparatus used in the present invention;
FIG. 3 is an enlarged partial cross-sectional view taken at A of FIG. 2 in accordance with the present invention;
FIG. 4 is a block diagram of the fan hob of FIG. 3 in accordance with the present invention;
FIG. 5 is a cross-sectional view of the delivery chamber of FIG. 2 in accordance with the present invention;
in the figure: the grinding device comprises a box body 1, a hinge seat 11, a trapezoid hole 12, a cylinder 2, a grinding cutter unit 3, a grinding cutter 31, a tapered hole 32, a second gear 33, a grinding bulge 34, a crushing unit 35, a first transmission rod 36, a second transmission rod 37, a fan-shaped hob 38, a blade 380, a cylindrical body 381, a cutter seat 382, a cutter tip 383, an electric push rod 384, a blanking plate 4, a first gear 41, a mixing and stirring unit 5, a water wheel 51, a spiral plate 52, a motor 53, a throwing cavity 6, a small hole 62, a first belt wheel 7, a second belt wheel 8, a belt 9 and a connecting rod 10.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described below with reference to the specific embodiments, and all directions of the invention are based on fig. 2.
As shown in fig. 1 to 5, the method for producing sodium hydroxide according to the present invention comprises the following steps:
s1: adding trona directly into a sodium hydroxide preparation device, grinding and crushing by using a grinding knife, enabling crushed solid particles to enter the bottom of the device through small blanking holes to be dissolved in water, fully stirring until the solid particles are dissolved, and standing until the solution is clear;
s2: adding quicklime into a feeding cavity of a device in S1, carrying an aqueous solution into the bottom of the feeding cavity by the rotation of a water wheel to react with the quicklime to generate lime milk [ Ca (OH)2] and discharging a large amount of heat, so that the solution is causticized in an environment with the temperature of 95-100 ℃;
s3: standing the causticized solution until the solution is clear, evaporating and concentrating until the concentration of sodium hydroxide is 46%, separating out partial solids, discharging the solution, cooling the discharged solution, and facilitating further evaporation and concentration to prepare a solid caustic soda finished product;
the sodium hydroxide preparation device in S1 comprises a box body 1, a cylinder 2, a grinding cutter unit 3, a blanking plate 4, a mixing and stirring unit 5, a motor 53, a feeding cavity 6, a first belt wheel 7, a second belt wheel 8, a belt 9, a hinge seat 11, a strip connecting rod 10, a crushing unit 35 and a first gear 41; the box body 1 is a cuboid hollow shell type, two trapezoidal holes 12 which are symmetrical along the center are formed in the top end of the box body and used for putting natural alkali, and a cylinder 2 is fixedly installed in the center of the inner side of the top of the box body 1; the output end of the cylinder 2 is hinged with the grinding cutter unit 3; the grinding knife unit 3 comprises a grinding knife 31, a conical hole 32, a second gear 33 and grinding protrusions 34, wherein the grinding knife 31 is hook-shaped and is bilaterally symmetrical along the center, a hinge hole is formed in the upper end of the grinding knife 31, the lower end of the grinding knife is arc-shaped, a plurality of grinding protrusions 34 are arranged on the surface of the arc-shaped end, the conical hole 32 is formed in the bottom of the hook-shaped part, a cavity is formed in one side of the conical hole 32, and a crushing unit 35 is arranged in the cavity; the blanking plate 4 is arc-shaped, a groove is formed in the inner part of the blanking plate, so that the grinding cutter 31 can grind and crush the blanking plate in the middle, a plurality of trapezoidal blanking small openings are formed in the lower end of the blanking plate, and the blanking plate 4 is fixedly connected to the inner wall of the box body 1 and is positioned below the grinding bulge 34; the throwing cavity 6 is a funnel-shaped hollow shell, the bottom of the throwing cavity is provided with a plurality of small holes 62, the small holes are fixedly arranged on the outer wall of the box body 1, and the other end of the throwing cavity extends into the box body 1 and is positioned below the blanking plate 4; the mixing and stirring unit 5 is arranged on the inner wall of the box body 1 and is positioned below the throwing cavity 6, the left end of the mixing and stirring unit is connected with a motor 53 arranged on the outer wall of the box body 1, and the right end of the mixing and stirring unit is connected with a first belt wheel 7; the second belt wheel 8 is positioned above the first belt wheel 7 and connected with the first belt wheel 7 through a belt 9, and the second belt wheel 8 is hinged with a hinge seat 11 fixedly arranged on the outer wall of the box body 1; the long strip-shaped connecting rod 10 is hinged with the hook-shaped part of the grinding cutter 31, the other end of the long strip-shaped connecting rod extends out of the box body 1 and is fixedly connected to the wheel side of the second belt wheel 8 to form an offset distance with the rolling axis, so that the grinding cutter is driven to shake for grinding; the left-right shaking of the grinding knife unit 3 enables the first gear 41 and the crushing unit 35 to be in meshing transmission; through the mutual matching among the box body 1, the cylinder 2, the grinding cutter unit 3, the blanking plate 4, the mixing and stirring unit 5, the motor 53, the throwing cavity 6, the first belt wheel 7, the second belt wheel 8, the belt 9, the hinge seat 11, the connecting rod 10, the crushing unit 35 and the first gear 41, the grinding and crushing are more thorough, the convenience and the high efficiency are realized, and the cost is saved; when the device works, the trona raw material is directly added into the device through the trapezoidal hole 32, most of the added trona is accumulated on the hook-shaped part of the grinding cutter 31, and a small part of the raw material directly falls into the blanking plate 4 through the tapered hole 32; at the moment, the air cylinder 2 pushes the grinding cutter unit 3 to move downwards, the grinding bulge 34 carries out direct primary crushing treatment on the raw materials falling into the blanking plate 4, and partial refined raw materials fall into the bottom of the box body 1 through a small blanking opening; after the motor 53 is started, the mixing and stirring unit 5 is driven to rotate, so that the raw materials and the aqueous solution are fully mixed, and after standing to obtain a clear solution, quicklime can be put into the putting cavity 6; because the motor 53 also drives the first belt wheel 7 to rotate, the second belt wheel 8 is driven to rotate by a belt, the principle of the eccentric cam is the same, and the grinding cutter 31 is driven to swing left and right, so that the medicine can be quickly ground and crushed as a pharmacy grinds the medicine, the grinding is the most primary grinding, the grinding amount is the most, and the first gear 41 and the second gear 33 are in a meshed state.
In one embodiment, the tapered holes 32 are in a shape with a large top and a small bottom, and are symmetrically distributed along the center of the cutter; the conical holes 32 can slow down the falling speed of the trona, so that the grinding and crushing are more thorough, and the raw materials are refined; when the trona raw material is put into the box body 1 once, in order to avoid the raw material from directly participating in mixing without grinding, crushing and refining, the tapered holes 32 are arranged to intercept partial raw material, so that the falling speed of the raw material is reduced, and the subsequent extrusion work of the raw material is facilitated.
As one embodiment, a crushing unit 35 is installed in a cavity on one side of the tapered hole 32; the left-right shaking of the grinding knife unit 3 enables the first gear 41 and the crushing unit 35 to be in meshing transmission; the crushing unit 35 comprises a second gear 33, a first transmission rod 36 and a second transmission rod 37; the second gear 33 is arranged on the cavity shaft and fixedly connected with the first transmission rod 36, and after the air cylinder 2 descends, the second gear 33 is in meshed transmission with the first gear 41 to drive the first transmission rod 36 to rotate; the second transmission rod 37 is in a strip shape, three grooves are formed in the left side of the second transmission rod, the upper end of the second transmission rod is hinged to the first transmission rod 36, and the lower end of the second transmission rod is hinged to the grinding cutter 31; the fan-shaped hob 38 is mounted in the groove; the taper size of the taper hole 32 is further changed through the matched motion among the gear 1, the gear 33 II, the transmission rod 36I and the transmission rod 37 II, the raw materials are pressed, the movement of the raw materials is accelerated, and the raw materials are crushed and refined; when the first gear 41 and the second gear 33 are in a meshed state, the rotation of the second gear 33 drives the fixedly connected first transmission rod 36 to rotate, and further drives the second transmission rod 37 to rotate; the rotation of the second transmission rod 37 changes the volume of the tapered hole 32, and simultaneously carries out the second extrusion crushing on the trona raw material in the tapered hole 32 and accelerates the downward movement of the raw material.
In one embodiment, a fan-shaped hob 38 is rotatably installed in a groove of the second transmission rod 37; the wind sector hob 38 is fan-shaped and comprises a blade 380 and a cylinder 381; the four blades 380 are uniformly distributed along the cylinder 381; the falling of the raw materials is accelerated by the unidirectional rotation of the fan-shaped hob 38, so that the raw materials are prevented from splashing upwards; when the second transmission rod 37 presses the raw material, the fan-shaped hob 38 is driven to rotate in a single direction, and the blade 380 is in an arc shape, so that the partially crushed raw material can be pushed downwards during rotation, the raw material is prevented from splashing upwards and blocking of a channel is prevented, and the raw material is ground and refined for the third time.
As one embodiment, the blade 380 is in a shape of a circular arc, and includes a blade seat 382, a blade tip 383, and an electric push rod 384; the tool apron 382 is hinged with a tool tip 383; the input end of the electric push rod 384 is fixedly connected with the cutter holder 382, and the output end of the electric push rod is hinged with the hinge seat 11 at the inner side of the cutter tip 383; through the mutual matching among the tool post 382, the tool tip 383 and the electric push rod 384, the raw materials are extruded by the rotation of the tool tip 383, and the crushing of the raw materials is accelerated; when the fan-shaped hob 38 rotates, the electric push rod 384 also works, when the output end of the electric push rod 384 retracts backwards, the space between the cutter tip 383 and the cutter holder 382 changes, the raw material can be compressed and refined again, the rotation of the second transmission rod 37 is matched, the grinding and refining speed of the raw material can be greatly increased, and the blockage of the channel is prevented.
As one embodiment, the mixing and stirring unit 5 comprises a water wheel 51 and a spiral plate 52, wherein the water wheel 51 is installed at the output end of a motor 53; the spiral plate 52 is arc-shaped and is welded at the output end of the motor 53 and is positioned at the right side of the water wheel 51; the water wheel 51 rotates to enable the water solution to enter the putting cavity 6 from the small hole 62 to react with the quicklime, the spiral plate 52 rotates to stir, lime milk is generated, a large amount of heat is released, the causticization reaction is accelerated, and preparation is made for preparing a caustic soda finished product; after the natural alkali raw materials after grinding and refining fall into the bottom of the box body 1 through the leak holes and are mixed with water, the natural alkali raw materials are kept stand to be clear solution, quicklime is put in the putting cavity 6, the motor 53 is started to drive the water wheel 51 to rotate, so that the water solution enters the putting cavity 6 from the small hole 62 and reacts with the quicklime, the water solution is stirred through the spiral plate 52, lime milk is generated and a large amount of heat is discharged, the temperature requirement of causticization reaction is just met, and the sodium hydroxide solution is prepared and is convenient for further preparing a finished caustic soda product.
When the device works, the trona raw material is directly added into the device through the trapezoidal hole 32, most of the added trona is accumulated on the hook-shaped part of the grinding cutter 31, and a small part of the raw material directly falls into the blanking plate 4 through the tapered hole 32; at the moment, the air cylinder 2 pushes the grinding cutter unit 3 to move downwards, the grinding bulge 34 carries out direct primary crushing treatment on the raw materials falling into the blanking plate 4, and partial refined raw materials fall into the bottom of the box body 1 through a small blanking opening; after the motor 53 is started, the mixing and stirring unit 5 is driven to rotate, so that the raw materials and the aqueous solution are fully mixed, and after standing to be a clear solution, quicklime is thrown from the throwing cavity 6; because the motor 53 also drives the first belt wheel 7 to rotate, the second belt wheel 8 rotates through belt transmission, and the principle is the same as that of an eccentric cam, the grinding cutter 31 is driven to swing left and right, as the medicine is ground by a pharmacy, a large amount of natural alkali raw materials can be quickly ground and crushed, the grinding is the most primary grinding, the grinding reduction is the most, and the first gear 41 and the second gear 33 are in a meshed state; when the natural alkali raw material is put into the box body 1 at one time, in order to avoid the raw material from directly participating in mixing without grinding, crushing and refining, the tapered holes 32 are arranged to intercept partial raw material, so that the descending speed of the raw material is reduced, and the subsequent extrusion work of the raw material is facilitated; when the first gear 41 and the second gear 33 are in a meshed state, the rotation of the second gear 33 drives the fixedly connected first transmission rod 36 to rotate, and further drives the second transmission rod 37 to rotate; the rotation of the second transmission rod 37 changes the volume of the tapered hole 32, and simultaneously carries out secondary extrusion crushing on the trona raw material in the tapered hole 32 and accelerates the raw material to move downwards; when the second transmission rod 37 presses the raw material, the fan-shaped hob 38 is driven to rotate in a single direction, and the blade 380 is in an arc shape, so that part of crushed raw material can be pushed downwards during rotation, the raw material is prevented from splashing upwards, the channel is prevented from being blocked, and meanwhile, the raw material is ground and refined for the third time; when the fan-shaped hob 38 rotates, the electric push rod 384 also works, when the output end of the electric push rod 384 retracts backwards, the space between the cutter tip 383 and the cutter holder 382 is changed, the raw material can be compressed and refined again, the grinding and refining speed of the raw material can be greatly increased by matching with the rotation of the second transmission rod 37, and the blockage of a channel is prevented; after the natural alkali raw materials after grinding and refining fall into the bottom of the box body 1 through the leak holes and are mixed with water, the natural alkali raw materials are kept stand to be clear solution, quicklime is put in the putting cavity 6, the motor 53 is started to drive the water wheel 51 to rotate, so that the water solution enters the putting cavity 6 from the small hole 62 and reacts with the quicklime, the water solution is stirred through the spiral plate 52, lime milk is generated and a large amount of heat is discharged, the temperature requirement of causticization reaction is just met, and the sodium hydroxide solution is prepared and is convenient for further preparing a finished caustic soda product.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A method for producing sodium hydroxide is characterized in that: the method comprises the following steps:
s1: adding trona directly into a sodium hydroxide preparation device, grinding and crushing by using a grinding knife, enabling crushed solid particles to enter the bottom of the device through small blanking holes to be dissolved in water, fully stirring until the solid particles are dissolved, and standing until the solution is clear;
s2: adding quicklime into a feeding cavity of a device in S1, carrying an aqueous solution into the bottom of the feeding cavity by the rotation of a water wheel to react with the quicklime to generate lime milk [ Ca (OH)2] and discharging a large amount of heat, so that the solution is causticized in an environment with the temperature of 95-100 ℃;
s3: standing the causticized solution until the solution is clear, evaporating and concentrating until the concentration of sodium hydroxide is 46%, separating out partial solids, discharging the solution, cooling the discharged solution, and facilitating further evaporation and concentration to prepare a solid caustic soda finished product;
the sodium hydroxide preparation device in S1 comprises a box body (1), a cylinder (2), a grinding cutter unit (3), a blanking plate (4), a mixing and stirring unit (5), a motor (53), a feeding cavity (6), a first belt wheel (7), a second belt wheel (8), a belt (9), a hinge seat (11), a strip-shaped connecting rod (10) and a first gear (41); the box body (1) is a cuboid hollow shell type, two trapezoidal holes (12) which are symmetrical along the center are formed in the top end of the box body and used for putting natural alkali, and an air cylinder (2) is fixedly installed in the center of the inner side of the top of the box body (1); the output end of the air cylinder (2) is hinged with the grinding cutter unit (3); the grinding cutter unit (3) comprises a grinding cutter (31), a conical hole (32) and grinding bulges (34), wherein the grinding cutter (31) is in a hook shape and is bilaterally symmetrical along the center, a hinge hole is formed in the upper end of the grinding cutter, the lower end of the grinding cutter is arc-shaped, the surface of the arc end of the grinding cutter is provided with a plurality of grinding bulges (34), and the bottom of the hook-shaped part is provided with the conical hole (32); the blanking plate (4) is arc-shaped, a groove is formed in the blanking plate, so that a grinding cutter (31) can grind and crush the blanking plate in the middle, a plurality of trapezoidal blanking small openings are formed in the lower end of the blanking plate, and the blanking plate (4) is fixedly connected to the inner wall of the box body (1) and is positioned below the grinding bulge (34); the feeding cavity (6) is in a funnel hollow shell shape, the bottom of the feeding cavity is provided with a plurality of small holes (62), the small holes are fixedly arranged on the outer wall of the box body (1), and the other end of the feeding cavity extends into the box body (1) and is positioned below the blanking plate (4); the mixing and stirring unit (5) is arranged on the inner wall of the box body (1) and is positioned below the throwing cavity (6), the left end of the mixing and stirring unit is connected with a motor (53) arranged on the outer wall of the box body (1), and the right end of the mixing and stirring unit is connected with a first belt wheel (7); the second belt wheel (8) is positioned above the first belt wheel (7) and is connected with the first belt wheel (7) through a belt (9), and the second belt wheel (8) is hinged with a hinge seat (11) fixedly arranged on the outer wall of the box body (1); the long strip-shaped connecting rod (10) is hinged with the hook-shaped part of the grinding cutter (31), the other end of the long strip-shaped connecting rod extends out of the box body (1), and the long strip-shaped connecting rod is fixedly connected to the wheel side of the second belt wheel (8) and forms an offset with the rolling axis, so that the grinding cutter can be driven to shake to grind; through the mutual cooperation between the box body (1), the cylinder (2), the grinding cutter unit (3), the blanking plate (4), the mixing and stirring unit (5), the motor (53), the putting cavity (6), the belt wheel (7), the belt wheel (8), the belt (9), the hinge seat (11), the connecting rod (10), the crushing unit (35) and the gear (41), the grinding and crushing are more thorough, the grinding is convenient and efficient, and the cost is saved.
2. The method for producing sodium hydroxide according to claim 1, characterized in that: the conical holes (32) are in a shape of big top and small bottom and are symmetrically distributed along the center of the cutter; the conical hole (32) can slow down the falling speed of the trona, so that the grinding and the crushing are more thorough, and the raw materials are refined.
3. The method for producing sodium hydroxide according to claim 2, characterized in that: a crushing unit (35) is arranged in a cavity on one side of the tapered hole (32); the left-right shaking of the grinding cutter unit (3) enables the first gear (41) and the crushing unit (35) to be in meshing transmission; the crushing unit (35) comprises a second gear (33), a first transmission rod (36) and a second transmission rod (37); the second gear (33) is arranged on the cavity shaft and is fixedly connected with the first transmission rod (36), and after the cylinder (2) descends, the second gear (33) is in meshed transmission with the first gear (41) to drive the first transmission rod (36) to rotate; the second transmission rod (37) is in a strip shape, three grooves are formed in the left side of the second transmission rod, the upper end of the second transmission rod is hinged to the first transmission rod (36), and the lower end of the second transmission rod is hinged to the grinding cutter (31); the taper size of the taper hole (32) is further changed through the matching motion among the first gear (41), the second gear (33), the first transmission rod (36) and the second transmission rod (37), the raw materials are pressed, the movement of the raw materials is accelerated, and the raw materials are crushed and refined.
4. A method for producing sodium hydroxide according to claim 3, characterized in that: a fan-shaped hob (38) is rotatably arranged in a groove of the second transmission rod (37); the fan-shaped hob (38) is fan-shaped and comprises a blade (380) and a cylindrical body (381); the four blades (380) are uniformly distributed along the cylindrical body (381); the falling of the raw materials is accelerated by the unidirectional rotation of the fan-shaped hob (38), and the raw materials are prevented from splashing upwards.
5. The method for producing sodium hydroxide according to claim 4, wherein: the blade (380) is in a circular arc shape and comprises a blade holder (382), a blade tip (383) and an electric push rod (384); the tool apron (382) is hinged with a tool tip (383); the input end of the electric push rod (384) is fixedly connected with the cutter holder (382), and the output end of the electric push rod is hinged with the hinge seat (11) at the inner side of the cutter tip (383); through the mutual matching among the tool post (382), the tool tip (383) and the electric push rod (384), the raw materials are extruded by the rotation of the tool tip (383), and the crushing of the raw materials is accelerated.
6. The method for producing sodium hydroxide according to claim 1, characterized in that: the mixing and stirring unit (5) comprises a water wheel (51) and a spiral plate (52), wherein the water wheel (51) is arranged at the output end of a motor (53); the spiral plate (52) is arc-shaped, is welded at the output end of the motor (53) and is positioned at the right side of the water wheel (51); the water wheel (51) rotates to enable the water solution to enter the putting cavity (6) from the small hole (62) to react with the quick lime, the spiral plate (52) rotates to stir, lime milk is generated, a large amount of heat is released, the causticization reaction is accelerated, and preparation is made for preparing a caustic soda finished product.
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