A sodium nitrate crystallization system

Abstract

The invention relates to the field of sodium nitrate preparation, in particular to a sodium nitrate crystallization system, comprising a bottom plate, a heating device, a fixing frame and a crystallization device. The stirring structure can stir the sodium nitrate mother liquor during the heating process. The stirring flow holes provided on the stirring blades can not only avoid the bubble phenomenon on the surface of the sodium nitrate mother liquor, reduce the waste of the sodium nitrate mother liquor and reduce the manufacturing cost, but also can make the sodium nitrate mother liquor be heated evenly, thus ensuring the uniformity of the particle size of the sodium nitrate crystals during the crystallization process, thereby improving the production quality of the sodium nitrate. The stirring structure and the liquid separation structure cooperate with each other, thus improving the evaporation speed of the water in the sodium nitrate mother liquor, thereby accelerating the concentration efficiency of the sodium nitrate mother liquor and further shortening the preparation cycle of the sodium nitrate. The rotating structure can cooperate with the material blocking plate to drive the sodium nitrate crystals at the bottom of the lower crystallization tube to accumulate at the material outlet, thereby improving the speed of manual material taking.

Description

Technical Field

[0001] The invention relates to the field of sodium nitrate preparation, in particular to a sodium nitrate crystallization system. Background Art

[0002] Sodium nitrate, also known as "Chilean nitrate", is a hygroscopic, colorless, transparent triangular crystal that is easily soluble in water. In industrial production, sodium nitrate mother liquor is often obtained by absorbing nitrogen oxides with alkaline solution, and then evaporating, crystallizing and drying. Sodium nitrate can be used to prepare catalysts in the nitric acid, sodium nitrite or sulfuric acid industries.

[0003] At present, the following difficulties are often encountered in the preparation process of sodium nitrate: a. A large number of bubbles will appear in the existing sodium nitrate mother liquor during the evaporation process, and these bubbles will often cause waste of mother liquor due to the sputtering effect during the bursting process, thereby increasing the manufacturing cost; b. The existing sodium nitrate mother liquor will usually be unevenly heated during the heating process, resulting in uneven particle size of sodium nitrate during the crystallization process, thereby reducing the quality of the finished product. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a sodium nitrate crystallization system.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a sodium nitrate crystallization system, comprising a bottom plate, a heating device, a fixing frame and a crystallization device, wherein the bottom plate is provided with a heating device in the middle of the upper surface, the fixing frames are symmetrically installed on the left and right sides of the heating device, the upper end of the fixing frame is fixedly connected with the crystallization device, and the crystallization device is located above the heating device;

[0006] The heating device comprises an insulation tube, a control switch, a heating rack and an electric heating wire, wherein an insulation tube is fixedly installed in the middle of the upper end surface of the bottom plate, a heating rack is symmetrically arranged on the bottom plate inside the insulation tube, a plurality of groups of electric heating wires are connected to the heating rack, a control switch is installed in the middle of the left side wall of the insulation tube, and the control switch is connected to the electric heating wire through a wire;

[0007] The crystallization device comprises an upper crystallization cylinder, an end cover, a feed port, a lower crystallization cylinder, a stirring structure, a connecting rod, a liquid separation structure, a liquid extraction structure and a rotating structure, wherein the upper end of the fixed frame is fixedly connected to the upper crystallization cylinder, the upper end of the upper crystallization cylinder is installed with an end cover, a position near the left end of the end cover is provided with a feed port, the lower end of the upper crystallization cylinder is rotatably connected to the lower crystallization cylinder, a stirring structure is installed inside the upper crystallization cylinder and the lower crystallization cylinder, a liquid separation structure is slidingly sleeved near the middle of the stirring structure, the left and right ends of the liquid separation structure are in contact with the left and right inner walls of the upper crystallization cylinder, a connecting rod is installed between the liquid separation structure and the stirring structure, the liquid extraction structure is installed on the right side wall of the lower crystallization cylinder, a rotating structure is provided at the lower end of the outer side wall of the lower crystallization cylinder, and the lower end of the rotating structure is fixedly connected to the right side wall of the insulation cylinder;

[0008] The crystallization device also includes a discharge port, a mounting groove, an L-shaped plate, a magnet block, an iron sheet, a limit spring and a limit protrusion, wherein a mounting groove is opened above the discharge port at a position near the lower end of the rear side wall of the lower crystallization cylinder, an L-shaped plate is arranged through the mounting groove, an iron sheet is installed on the upper surface of the L-shaped plate, a magnet block is arranged on the top of the mounting groove, a clamping groove is opened at the bottom of the discharge port, the lower end of the L-shaped plate extends to the bottom of the clamping groove, cylindrical grooves are symmetrically opened on the left and right side walls of the clamping groove, the limiting protrusion is slidably connected in the cylindrical groove by a limit spring, and concave grooves are symmetrically opened on the left and right side walls of the lower end of the L-shaped plate, and the limiting protrusion can cooperate with the concave groove.

[0009] Preferably, a heat-conducting groove is provided on the lower end surface of the lower crystallization tube, and a heat-conducting layer is installed in the heat-conducting groove. The heat-conducting layer can evenly transfer the heat of the heating wire to the sodium nitrate mother liquor inside the lower crystallization tube, so that it is heated more evenly.

[0010] Preferably, an annular T-shaped groove is provided at the lower end of the upper crystallization tube, and a T-shaped ring is provided at the upper end of the lower crystallization tube, and the T-shaped ring is slidably arranged in the annular T-shaped groove.

[0011] Preferably, sliding balls are provided at the contacting parts of the T-ring and the annular T-slot, and the sliding balls can reduce the friction between the T-ring and the annular T-slot, thereby facilitating the rotation of the lower crystallization cylinder relative to the upper crystallization cylinder.

[0012] Preferably, the stirring structure includes a reciprocating motor, a stirring shaft, a cross bar, a vertical bar, stirring blades and a material baffle plate, wherein a reciprocating motor is installed on the middle part of the upper end surface of the end cover through a motor base, the reciprocating motor output shaft is connected to the stirring shaft through a coupling, the lower end of the stirring shaft extends to the bottom of the lower crystallization cylinder and is connected to the lower crystallization cylinder through a bearing, the stirring shaft and the end cover are connected through a bearing, cross bars are evenly arranged along the circumference of the lower middle part of the stirring shaft, a connecting rod is fixedly installed in the middle part of the upper end surface of each cross bar, and vertical bars are arranged in a linear array on the lower end surface of each cross bar, the vertical bars and the cross bars are connected by bearings, stirring blades are staggered on the vertical bars, and a material baffle plate is fixedly installed on the side wall of the stirring shaft near the lower end, and the material baffle plate and the lower crystallization cylinder are in a sliding fit.

[0013] Preferably, stirring holes are evenly opened on the stirring blades, and the stirring holes can reduce the resistance of the stirring blades during rotation. At the same time, the sodium nitrate mother liquor can increase the stirring effect through the stirring holes, so that the sodium nitrate mother liquor is heated more evenly.

[0014] Preferably, the liquid separation structure includes a limit block, a liquid separation plate, an arc groove, a compression spring and an arc-shaped liquid separation block, wherein the limit grooves are symmetrically provided on the left and right side walls of the upper crystallization cylinder near the lower end, and the limit blocks are arranged in the limit grooves. The proximal ends of the two limit blocks are fixedly connected with the liquid separation plate, and the liquid separation plate is slidingly sleeved on the stirring shaft. The liquid separation plate is evenly provided with arc grooves along its circumference, and an arc-shaped liquid separation block is slidably installed in the arc groove through a compression spring. The upper and lower ends of the half of the arc groove away from the compression spring are open, and the lower end of the arc-shaped liquid separation block and the upper end of the connecting rod are fixedly connected.

[0015] Preferably, a sealing sleeve is installed at the connection between the liquid separation disk and the stirring shaft, and the sealing sleeve can prevent the recycled sodium nitrate mother liquor from leaking downward from the connection between the liquid separation disk and the stirring shaft to the interior of the lower crystallization cylinder when taking the material.

[0016] Preferably, the liquid extraction structure includes a filter screen, a first liquid guide tube, a liquid extraction pump and a second liquid guide tube, wherein the liquid extraction pump is fixedly installed on the middle part of the right side wall of the lower crystallization cylinder through a pump seat, the first liquid guide tube is connected to the inlet of the liquid extraction pump, the filter screen is installed at the lower end of the first liquid guide tube and is connected to the interior of the lower crystallization cylinder, the second liquid guide tube is detachably installed at the outlet of the liquid extraction pump, and the upper end of the second liquid guide tube is connected to the interior of the upper crystallization cylinder.

[0017] Preferably, the rotating structure includes a mounting plate, a driving motor, a driving gear, gear teeth and an annular gear ring, wherein a mounting plate is fixedly connected to the middle of the right side wall of the insulation cylinder, a driving motor is installed on the upper end surface of the mounting plate through a motor base, a driving gear is installed on the output shaft of the driving motor through a key connection, an annular gear ring is fixedly installed at the lower end of the upper crystallization cylinder, and gear teeth are evenly arranged on the outer side wall of the annular gear ring along its circumference, and the gear teeth and the driving gear are meshed with each other.

[0018] Beneficial effects of the present invention:

[0019] (1) A sodium nitrate crystallization system according to the present invention, wherein the stirring structure according to the present invention can stir the sodium nitrate mother liquor during the heating process, and the stirring holes provided on the stirring blades can not only avoid the appearance of bubbles on the surface of the sodium nitrate mother liquor, thus reducing the waste of the sodium nitrate mother liquor and the manufacturing cost, but also can make the sodium nitrate mother liquor be heated uniformly, thus ensuring the uniformity of the particle size of the sodium nitrate crystals during the crystallization process, thereby improving the production quality of the sodium nitrate;

[0020] (2) A sodium nitrate crystallization system according to the present invention, wherein the stirring structure and the liquid separation structure according to the present invention cooperate with each other to increase the evaporation rate of water in the sodium nitrate mother liquor, thereby accelerating the concentration efficiency of the sodium nitrate mother liquor and further shortening the preparation cycle of sodium nitrate;

[0021] (3) In the sodium nitrate crystallization system described in the present invention, the rotating structure described in the present invention can cooperate with the baffle plate to drive the sodium nitrate crystals at the bottom of the lower crystallization tube to accumulate at the discharge port, thereby improving the speed of manual material removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a front view structural schematic diagram of the present invention;

[0024] Figure 2 It is a left-side structural schematic diagram of the present invention;

[0025] Figure 3 The present invention Figure 1 An enlarged schematic diagram of point A;

[0026] Figure 4 The present invention Figure 1 An enlarged schematic diagram of point B;

[0027] Figure 5 The present invention Figure 2 An enlarged schematic diagram of point C;

[0028] Figure 6 It is a partial structural schematic diagram of the stirring structure in the present invention;

[0029] Figure 7 It is a three-dimensional structural schematic diagram of the connecting rod and the liquid separation structure in the present invention;

[0030] Figure 8 It is a front view of the connecting rod and the liquid separation structure in the present invention;

[0031] Fig. 9 The present invention Figure 8 DD section view.

[0032] In the figure: 1, bottom plate; 2, heating device; 21, insulation cylinder; 22, control switch; 23, heating frame; 24, electric heating wire; 3, fixed frame; 4, crystallization device; 41, upper crystallization cylinder; 42, end cover; 43, feed port; 44, lower crystallization cylinder; 45, stirring structure; 451, reciprocating motor; 452, stirring shaft; 453, cross bar; 454, vertical bar; 455, stirring blade; 456, baffle plate; 46, connecting rod; 47, liquid separation structure; 471, limit block; 472, liquid separation plate; 47 3. Arc groove; 474. Compression spring; 475. Arc liquid separation block; 48. Liquid extraction structure; 481. Filter; 482. First liquid guide tube; 483. Liquid extraction pump; 484. Second liquid guide tube; 49. Rotating structure; 491. Mounting plate; 492. Driving motor; 493. Driving gear; 494. Gear; 495. Annular gear ring; 410. Discharge port; 411. Mounting groove; 412. L-shaped plate; 413. Magnet block; 414. Iron sheet; 415. Limit spring; 416. Limit protrusion. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] See also Figures 1 to 9 A sodium nitrate crystallization system comprises a bottom plate 1, a heating device 2, a fixing frame 3 and a crystallization device 4, wherein the heating device 2 is arranged in the middle of the upper end surface of the bottom plate 1, the fixing frames 3 are symmetrically installed on the left and right sides of the heating device 2, the upper end of the fixing frame 3 is fixedly connected with the crystallization device 4, and the crystallization device 4 is located above the heating device 2;

[0035] The heating device 2 comprises an insulation tube 21, a control switch 22, a heating frame 23 and an electric heating wire 24, wherein the insulation tube 21 is fixedly installed in the middle of the upper end surface of the bottom plate 1, and the heating frame 23 is symmetrically arranged on the bottom plate 1 inside the insulation tube 21, and multiple groups of electric heating wires 24 are connected to the heating frame 23, and the electric heating wires 24 are located directly below the lower crystallization tube 44. The lower end surface of the lower crystallization tube 44 is provided with a heat conduction groove, and a heat conduction layer is installed in the heat conduction groove. The heat conduction layer can evenly transfer the heat of the electric heating wire 24 to the sodium nitrate mother liquor inside the lower crystallization tube 44, so that it is heated more evenly. The control switch 22 is installed in the middle of the left side wall of the insulation tube 21, and the control switch 22 is connected to the electric heating wire 24 through a wire. In specific operation, the sodium nitrate mother liquor is manually added into the lower crystallization tube 44, and the control switch 22 is started to make the electric heating wire 24 energized and heated, thereby heating the sodium nitrate mother liquor inside the lower crystallization tube 44.

[0036] The crystallization device 4 includes an upper crystallization cylinder 41, an end cover 42, a feed port 43, a lower crystallization cylinder 44, a stirring structure 45, a connecting rod 46, a liquid separation structure 47, a liquid extraction structure 48 and a rotating structure 49, wherein the upper end of the fixed frame 3 is fixedly connected to the upper crystallization cylinder 41, the upper end of the upper crystallization cylinder 41 is installed with an end cover 42, a feed port 43 is arranged near the left end of the end cover 42, the lower end of the upper crystallization cylinder 41 is rotatably connected to the lower crystallization cylinder 44, the lower end of the upper crystallization cylinder 41 is provided with an annular T-shaped groove, the upper end of the lower crystallization cylinder 44 is provided with a T-shaped ring, the T-shaped ring is slidably arranged in the annular T-shaped groove, and the T-shaped ring and the annular T-shaped groove are in contact with each other. A sliding ball is provided, which can reduce the friction between the T-ring and the annular T-groove, thereby facilitating the rotation of the lower crystallization cylinder 44 relative to the upper crystallization cylinder 41. A stirring structure 45 is installed inside the upper crystallization cylinder 41 and the lower crystallization cylinder 44. A liquid separation structure 47 is slidingly sleeved near the middle of the stirring structure 45. The left and right ends of the liquid separation structure 47 are in contact with the left and right inner walls of the upper crystallization cylinder 41. A connecting rod 46 is installed between the liquid separation structure 47 and the stirring structure 45. A liquid extraction structure 48 is installed on the right side wall of the lower crystallization cylinder 44. A rotating structure 49 is provided at the lower end of the outer side wall of the lower crystallization cylinder 44. The lower end of the rotating structure 49 is fixedly connected to the right side wall of the insulation cylinder 21.

[0037] In the specific operation, sodium nitrate mother liquor is manually added into the lower crystallization cylinder 44 from the feed port 43, the heating device 2 is started, and the sodium nitrate mother liquor in the lower crystallization cylinder 44 is heated by the heating device 2, and the stirring structure 45 is started at the same time, and the sodium nitrate mother liquor in the lower crystallization cylinder 44 is stirred by the stirring structure 45, so that it is evenly heated. During the movement of the stirring structure 45, the liquid separation structure 47 is driven to open and close continuously. When the liquid separation structure 47 is in the open state, the solvent in the sodium nitrate mother liquor is heated and sequentially passes through the liquid separation structure 47 and the feed port 43. 3, when sodium nitrate crystals begin to appear at the bottom of the sodium nitrate mother liquor, the heating device 2 is stopped, and the sodium nitrate mother liquor will be continuously cooled down. During the cooling process, sodium nitrate crystals will be continuously precipitated from the bottom of the sodium nitrate mother liquor. When the sodium nitrate crystals precipitate slowly or no longer precipitate, the liquid extraction structure 48 is started, and the liquid in the sodium nitrate mother liquor is extracted into the upper crystallization cylinder 41 above the liquid separation structure 47 through the liquid extraction structure 48, thereby completing the separation process of the sodium nitrate crystals and the mother liquor. The function of the rotating structure 49 is to facilitate the collection of the sodium nitrate crystals at the bottom of the lower crystallization cylinder 44.

[0038] The crystallization device 4 also includes a discharge port 410, a mounting groove 411, an L-shaped plate 412, a magnet block 413, an iron sheet 414, a limit spring 415 and a limit protrusion 416, wherein the rear side wall of the lower crystallization tube 44 is provided with a discharge port 410 near the lower end, a mounting groove 411 is provided above the discharge port 410, an L-shaped plate 412 is penetrated through the mounting groove 411, an iron sheet 414 is installed on the upper end surface of the L-shaped plate 412, a magnet block 413 is provided on the top of the mounting groove 411, a clamping groove is provided at the bottom of the discharge port 410, the lower end of the L-shaped plate 412 extends to the bottom of the clamping groove, cylindrical grooves are symmetrically provided on the left and right side walls of the clamping groove, and the limit protrusion 416 is slidably connected in the cylindrical groove by the limit spring 415, and concave grooves are symmetrically provided on the left and right side walls of the lower end of the L-shaped plate 412, and the limit protrusion 416 can cooperate with the concave groove. During specific operation, the L-shaped plate 412 is manually pushed upwards to make the magnet block 413 and the iron sheet 414 attract each other. At this time, the discharge port 410 is in an open state, which is convenient for manually taking out the sodium nitrate crystals at the bottom of the lower crystallization tube 44 and carrying out subsequent processes. The function of the limit spring 415 and the limit protrusion 416 is to limit and fix the L-shaped plate 412 when the discharge port 410 is closed, thereby ensuring the sealing of the discharge port 410.

[0039] The stirring structure 45 includes a reciprocating motor 451, a stirring shaft 452, a cross bar 453, a vertical bar 454, a stirring blade 455 and a baffle plate 456, wherein a reciprocating motor 451 is installed in the middle of the upper end surface of the end cover 42 through a motor base, and a stirring shaft 452 is connected to the output shaft of the reciprocating motor 451 through a coupling, and the lower end of the stirring shaft 452 extends to the bottom of the lower crystallization cylinder 44 and is connected to the lower crystallization cylinder 44 through a bearing, and the stirring shaft 452 and the end cover 42 are connected through a bearing, and a cross bar 453 is evenly arranged at a lower position in the middle of the stirring shaft 452 along its circumference, and each cross bar 453 is evenly arranged in the middle of the upper end surface A connecting rod 46 is fixedly installed, and the lower end surface of each cross bar 453 is arranged with vertical rods 454 in a linear array. The vertical rods 454 and the cross bars 453 are connected by bearings. Stirring blades 455 are staggered on the vertical rods 454. The stirring blades 455 are evenly provided with stirring holes. The stirring holes can reduce the resistance of the stirring blades 455 during rotation. At the same time, the sodium nitrate mother liquor can increase the stirring effect through the stirring holes, so that the sodium nitrate mother liquor is heated more evenly. A baffle plate 456 is fixedly installed near the lower end of the side wall of the stirring shaft 452, and the baffle plate 456 and the lower crystallization cylinder 44 are in sliding fit. During specific operation, when the sodium nitrate mother liquor is heated, the reciprocating motor 451 is started, and the reciprocating motor 451 drives the stirring shaft 452 to rotate back and forth, thereby driving the horizontal rod 453 and the vertical rod 454 to rotate back and forth. During the reciprocating rotation of the vertical rod 454, the stirring blade 455 can be driven to rotate and stir the sodium nitrate mother liquor to make it evenly heated. At the same time, the generation of bubbles can be avoided during the stirring process, thereby reducing the manufacturing cost of sodium nitrate.

[0040] The liquid separation structure 47 includes a limit block 471, a liquid separation plate 472, an arc groove 473, a compression spring 474 and an arc liquid separation block 475, wherein the left and right side walls of the upper crystallization cylinder 41 are symmetrically provided with limit grooves near the lower end, and the limit blocks 471 are arranged in the limit grooves, and the adjacent ends of the two limit blocks 471 are fixedly connected with the liquid separation plate 472, and the liquid separation plate 472 is slidably sleeved on the stirring shaft 452, and a sealing sleeve is installed at the connection between the liquid separation plate 472 and the stirring shaft 452 The sealing sleeve can prevent the recycled sodium nitrate mother liquor from leaking downward from the connection between the separatory plate 472 and the stirring shaft 452 to the interior of the lower crystallization cylinder 44 when taking the material. The separatory plate 472 is evenly provided with arc grooves 473 along its circumference. An arc-shaped separatory block 475 is slidably installed in the arc groove 473 through a compression spring 474. The upper and lower ends of the half of the arc groove 473 away from the compression spring 474 are both open, and the lower end of the arc-shaped separatory block 475 and the upper end of the connecting rod 46 are fixedly connected. During specific operation, as the cross bar 453 reciprocates, the cross bar 453 will drive the connecting rod 46 to rotate reciprocatingly, and the arc-shaped liquid separation block 475 will be driven to reciprocate in the arc-shaped groove 473 through the connecting rod 46. At this time, the half of the arc-shaped groove 473 away from the compression spring 474 is in a reciprocating opening and closing state. When the arc-shaped groove 473 is opened, the moisture in the sodium nitrate mother liquor will be heated and discharged upward through the arc-shaped groove 473 and the feed port 43 in turn, thereby achieving the purpose of concentrating the sodium nitrate mother liquor.

[0041] The liquid extraction structure 48 includes a filter screen 481, a first liquid guide tube 482, a liquid extraction pump 483 and a second liquid guide tube 484, wherein a liquid extraction pump 483 is fixedly installed on the middle part of the right side wall of the lower crystallization cylinder 44 through a pump seat, the first liquid guide tube 482 is connected to the inlet of the liquid extraction pump 483, a filter screen 481 is installed at the lower end of the first liquid guide tube 482 and is connected to the interior of the lower crystallization cylinder 44, and a second liquid guide tube 484 is detachably installed at the outlet of the liquid extraction pump 483, and the upper end of the second liquid guide tube 484 is connected to the interior of the upper crystallization cylinder 41. During specific operation, when the sodium nitrate crystals at the bottom of the sodium nitrate mother liquor precipitate slowly or no longer precipitate, the reciprocating motor 451 stops running. At this time, the arc groove 473 on the liquid separation plate 472 is in a closed state, and the liquid pump 483 is started. The sodium nitrate mother liquor with a lower concentration in the lower crystallization tube 44 is pumped upward to the upper crystallization tube 41 through the liquid pump 483 for next use. The filter screen 481 can prevent the precipitated sodium nitrate crystals from entering the first liquid guide tube 482 during the liquid pumping process to cause blockage.

[0042] The rotating structure 49 includes a mounting plate 491, a driving motor 492, a driving gear 493, gear teeth 494 and an annular gear ring 495, wherein the mounting plate 491 is fixedly connected to the middle of the right side wall of the insulation cylinder 21, the driving motor 492 is installed on the upper end surface of the mounting plate 491 through the motor base, and the driving gear 493 is installed on the output shaft of the driving motor 492 through a key connection. An annular gear ring 495 is fixedly installed at the lower end of the upper crystallization cylinder 41, and gear teeth 494 are evenly arranged on the outer side wall of the annular gear ring 495 along its circumference, and the gear teeth 494 and the driving gear 493 are meshed with each other. During specific operation, after the sodium nitrate mother liquor in the lower crystallization cylinder 44 is pumped out into the upper crystallization cylinder 41, the lower end of the second liquid guiding tube 484 and the liquid pump 483 are manually separated, and the driving motor 492 is started at this time, and the driving motor 492 drives the active gear 493 to rotate, thereby driving the gear 494 and the annular gear ring 495 to rotate, and the annular gear ring 495 drives the lower crystallization cylinder 44 to rotate. During the rotation of the lower crystallization cylinder 44, due to the blocking effect of the baffle plate 456, the sodium nitrate crystals at the bottom of the lower crystallization cylinder 44 will continue to accumulate at the discharge port 410, so as to facilitate manual removal and subsequent processes.

[0043] The working process of the present invention when in use:

[0044] The first step: manually adding sodium nitrate mother liquor from the feed port 43 into the lower crystallization cylinder 44, starting the control switch 22 to energize the heating wire 24 to generate heat, thereby heating the sodium nitrate mother liquor in the lower crystallization cylinder 44;

[0045] Step 2: During the heating process, the reciprocating motor 451 is started, and the stirring shaft 452 is driven to rotate back and forth by the reciprocating motor 451, thereby driving the cross bar 453 and the vertical bar 454 to rotate back and forth. During the reciprocating rotation of the vertical bar 454, the stirring blade 455 can be driven to rotate and stir the sodium nitrate mother liquor to make it evenly heated. At the same time, the generation of bubbles can be avoided during the stirring process, thereby reducing the manufacturing cost of sodium nitrate. During the reciprocating rotation of the cross bar 453, the cross bar 453 will drive the connecting rod 46 to rotate back and forth, and the arc-shaped liquid separation block 475 is driven to reciprocate in the arc-shaped groove 473 by the connecting rod 46. At this time, the half of the arc-shaped groove 473 away from the compression spring 474 is in a reciprocating opening and closing state. When the arc-shaped groove 473 is opened, the water in the sodium nitrate mother liquor will be heated and discharged upward through the arc-shaped groove 473 and the feed port 43 in turn, thereby achieving the purpose of concentrating the sodium nitrate mother liquor;

[0046] Step 3: When sodium nitrate crystals begin to precipitate from the bottom of the sodium nitrate mother liquor, the control switch 22 is turned off and the heating process of the sodium nitrate mother liquor is stopped. At this time, the sodium nitrate mother liquor in the lower crystallization tube 44 will continue to cool down, and sodium nitrate crystals will continue to precipitate from its bottom. When the sodium nitrate crystals at the bottom of the sodium nitrate mother liquor precipitate slowly or no longer precipitate, the reciprocating motor 451 stops running. At this time, the arc groove 473 on the liquid separation plate 472 is in a closed state, and the liquid pump 483 is started. The sodium nitrate mother liquor with a lower concentration in the lower crystallization tube 44 is pumped upward to the upper crystallization tube 41 for recycling by the liquid pump 483;

[0047] Step 4: After the above step 3 is completed, the lower end of the second liquid guiding tube 484 and the liquid pump 483 are manually separated, and the driving motor 492 is started at this time. The driving motor 492 drives the active gear 493 to rotate, thereby driving the gear 494 and the annular gear ring 495 to rotate, and the annular gear ring 495 drives the lower crystallization tube 44 to rotate. During the rotation of the lower crystallization tube 44, due to the blocking effect of the baffle plate 456, the sodium nitrate crystals at the bottom of the lower crystallization tube 44 will continue to accumulate at the discharge port 410. By manually pushing the L-shaped plate 412 upward, the magnet block 413 and the iron sheet 414 are attracted to each other. At this time, the discharge port 410 is in an open state, and the sodium nitrate crystals are manually taken out and subsequent drying processes are carried out to obtain finished sodium nitrate.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sodium nitrate crystallization system, comprising a base plate (1), a heating device (2), a fixing frame (3) and a crystallization device (4), characterized in that: A heating device (2) is arranged in the middle of the upper end surface of the bottom plate (1), and fixed frames (3) are symmetrically installed on the left and right sides of the heating device (2). A crystallization device (4) is fixedly connected to the upper end of the fixed frame (3), and the crystallization device (4) is located above the heating device (2); The heating device (2) comprises an insulating tube (21), a control switch (22), a heating frame (23) and an electric heating wire (24), wherein the insulating tube (21) is fixedly mounted in the middle of the upper end surface of the bottom plate (1), the heating frame (23) is symmetrically arranged on the bottom plate (1) inside the insulating tube (21), a plurality of groups of electric heating wires (24) are connected to the heating frame (23), the control switch (22) is mounted in the middle of the left side wall of the insulating tube (21), and the control switch (22) is connected to the electric heating wire (24) through a wire; The crystallization device (4) comprises an upper crystallization cylinder (41), an end cover (42), a feed port (43), a lower crystallization cylinder (44), a stirring structure (45), a connecting rod (46), a liquid separation structure (47), a liquid extraction structure (48) and a rotating structure (49), wherein the upper end of the fixed frame (3) is fixedly connected to the upper crystallization cylinder (41), the upper end of the upper crystallization cylinder (41) is equipped with an end cover (42), a feed port (43) is arranged near the left end of the end cover (42), the lower end of the upper crystallization cylinder (41) is rotatably connected to the lower crystallization cylinder (44), and the upper crystallization cylinder (4 1) and a stirring structure (45) are installed inside the lower crystallization cylinder (44), a liquid separation structure (47) is slidably sleeved near the middle of the stirring structure (45), the left and right ends of the liquid separation structure (47) are in contact with the left and right inner walls of the upper crystallization cylinder (41), a connecting rod (46) is installed between the liquid separation structure (47) and the stirring structure (45), a liquid extraction structure (48) is installed on the right side wall of the lower crystallization cylinder (44), and a rotating structure (49) is provided at the lower end of the outer side wall of the lower crystallization cylinder (44), and the lower end of the rotating structure (49) is fixedly connected to the right side wall of the insulation cylinder (21); The crystallization device (4) further comprises a discharge port (410), a mounting groove (411), an L-shaped plate (412), a magnet block (413), an iron sheet (414), a limit spring (415) and a limit protrusion (416), wherein a discharge port (410) is provided at a position near the lower end of the rear side wall of the lower crystallization cylinder (44), a mounting groove (411) is provided above the discharge port (410), an L-shaped plate (412) is provided through the mounting groove (411), and a limit spring (415) is provided on the upper end surface of the L-shaped plate (412). An iron sheet (414), a magnet block (413) is arranged at the top of the mounting groove (411), a clamping groove is provided at the bottom of the discharge port (410), the lower end of the L-shaped plate (412) extends to the bottom of the clamping groove, cylindrical grooves are symmetrically provided on the left and right side walls of the clamping groove, and a limiting protrusion (416) is slidably connected in the cylindrical groove through a limiting spring (415), and concave grooves are symmetrically provided on the left and right side walls of the lower end of the L-shaped plate (412), and the limiting protrusion (416) can cooperate with the concave grooves; The liquid separation structure (47) comprises a limit block (471), a liquid separation plate (472), an arc-shaped groove (473), a compression spring (474) and an arc-shaped liquid separation block (475), wherein the limit grooves are symmetrically provided at the positions near the lower end of the left and right side walls of the upper crystallization cylinder (41), and the limit blocks (471) are arranged in the limit grooves, and the liquid separation plate (472) is fixedly connected to the adjacent ends of the two limit blocks (471), and the liquid separation plate (472) is slidably sleeved on the stirring shaft (452). The liquid separation plate (472) is evenly provided with arc grooves (473) along its circumference, and an arc liquid separation block (475) is slidably installed in the arc groove (473) through a compression spring (474). The upper and lower ends of the half of the arc groove (473) away from the compression spring (474) are both open, and the lower end of the arc liquid separation block (475) and the upper end of the connecting rod (46) are fixedly connected; a sealing sleeve is installed at the connection between the liquid separation plate (472) and the stirring shaft (452).

2. A sodium nitrate crystallization system according to claim 1, characterized in that: The lower end surface of the lower crystallization cylinder (44) is provided with a heat conduction groove, and a heat conduction layer is installed in the heat conduction groove.

3. A sodium nitrate crystallization system according to claim 1, characterized in that: The lower end of the upper crystallization tube (41) is provided with an annular T-shaped groove, and the upper end of the lower crystallization tube (44) is provided with a T-shaped ring, which is slidably arranged in the annular T-shaped groove.

4. A sodium nitrate crystallization system according to claim 3, characterized in that: The contacting parts of the T-ring and the annular T-slot are provided with sliding balls.

5. A sodium nitrate crystallization system according to claim 1, characterized in that: The stirring structure (45) comprises a reciprocating motor (451), a stirring shaft (452), a horizontal rod (453), a vertical rod (454), a stirring blade (455) and a material baffle (456), wherein the reciprocating motor (451) is installed at the middle of the upper end surface of the end cover (42) through a motor base, the stirring shaft (452) is connected to the output shaft of the reciprocating motor (451) through a coupling, the lower end of the stirring shaft (452) extends to the bottom of the lower crystallization cylinder (44) and is connected to the lower crystallization cylinder (44) through a bearing, and the stirring shaft (452) and the end cover (42) are connected through a bearing. Cross bars (453) are evenly arranged along the circumference of the lower middle part of the stirring shaft (452), a connecting rod (46) is fixedly installed in the middle of the upper end surface of each cross bar (453), and vertical bars (454) are arranged in a linear array on the lower end surface of each cross bar (453), the vertical bars (454) and the cross bars (453) are connected by bearings, and stirring blades (455) are staggered on the vertical bars (454), and a baffle plate (456) is fixedly installed near the lower end of the side wall of the stirring shaft (452), and the baffle plate (456) and the lower crystallization cylinder (44) are in sliding fit.

6. A sodium nitrate crystallization system according to claim 5, characterized in that: The stirring blade (455) is evenly provided with stirring holes.

7. A sodium nitrate crystallization system according to claim 1, characterized in that: The liquid extraction structure (48) comprises a filter screen (481), a first liquid guide tube (482), a liquid extraction pump (483) and a second liquid guide tube (484), wherein the liquid extraction pump (483) is fixedly installed in the middle of the right side wall of the lower crystallization cylinder (44) through a pump seat, the first liquid guide tube (482) is connected to the inlet of the liquid extraction pump (483), the filter screen (481) is installed at the lower end of the first liquid guide tube (482) and is connected to the interior of the lower crystallization cylinder (44), the second liquid guide tube (484) is installed at the outlet of the liquid extraction pump (483) in a detachable manner, and the upper end of the second liquid guide tube (484) is connected to the interior of the upper crystallization cylinder (41).

8. A sodium nitrate crystallization system according to claim 1, characterized in that: The rotating structure (49) comprises a mounting plate (491), a driving motor (492), a driving gear (493), gear teeth (494) and an annular gear ring (495), wherein the mounting plate (491) is fixedly connected to the middle of the right side wall of the heat insulation cylinder (21), the driving motor (492) is installed on the upper end surface of the mounting plate (491) through a motor base, the driving gear (493) is installed on the output shaft of the driving motor (492) by key connection, the annular gear ring (495) is fixedly installed at the lower end of the upper crystallization cylinder (41), and the outer side wall of the annular gear ring (495) is evenly provided with gear teeth (494) along its circumference, and the gear teeth (494) and the driving gear (493) are meshed with each other.

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