Preparation process of high-purity potassium chloride

Abstract

The invention discloses a preparation technology of high-purity potassium chloride, and relates to the technical field of potassium chloride preparation, the preparation technology comprises the steps of raw material treatment, impurity removal, dissolution and filtration, a crystallization reaction kettle stage and drying and packaging, a driving motor is arranged at the top end of a crystallization kettle main body, and a reaction cavity is formed in the crystallization kettle main body; the inner wall of the collecting box is scraped through the edge of a fixed scraper, crystals which are not cleaned up on the surface of the collecting box are cleaned again through a Y-shaped scraper, and the situation that the crystals on the surface of the collecting box are omitted and left on the surface of the collecting box is avoided; the crystals on the surface of the collecting box are scraped, so that high-purity potassium chloride can be discharged, the end of the scraping knife is always in contact with the side wall of the collecting box, the potassium chloride crystals on the side wall of the collecting box are cleaned more thoroughly, and the collecting box and the stirring fork rotate in opposite directions, so that the potassium chloride crystals on the surface of the collecting box can be quickly cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of potassium chloride preparation, in particular to a preparation process of high-purity potassium chloride. Background Art

[0002] During the preparation of potassium chloride, industrial potassium chloride is often used for further purification. Industrial potassium chloride undergoes a series of physical and chemical processes to extract high-purity potassium chloride. During the entire preparation process, the control of reaction conditions in the crystallization kettle is very critical, which directly affects the purity and yield of potassium chloride. The crystallization kettle is equipped with an advanced temperature control system and stirring device, which can accurately control the growth environment and conditions of the crystals.

[0003] In the prior art, when potassium chloride reacts in a crystallization kettle, some precipitated crystals accumulate on the inner wall of the crystallization kettle, making it difficult for the residual potassium chloride crystals to be discharged with the solution. The potassium chloride crystals adhere to the inner wall of the crystallization kettle for a long time, and the potassium chloride on the inner wall of the crystallization kettle is more difficult to separate from or clean the inner wall of the crystallization kettle. According to Chinese patent CN220715834U, "the large particles adhering to the inner wall are cleaned by a cleaning column, the guide scraper collects the remaining small particles, and finally, under the guidance of a cleaning brush, the small particles are dropped into the bottom of the reactor body to clean the inner wall of the reactor body". It can be seen that some crystallization kettles are provided with a structure for scraping crystals, but the cleaning structure rotates relative to the inside of the crystallization kettle to clean the crystals. After long-term contact and friction, the scraper is easily worn, so that there is a certain gap when the scraper contacts the inner wall of the crystallization kettle, which causes the potassium chloride on the inner wall of the crystallization kettle to be not cleaned. Summary of the Invention

[0004] The object of the present invention is to provide a process for preparing high-purity potassium chloride to solve the problems raised in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A preparation process for high-purity potassium chloride comprises the following steps:

[0007] Step 1: Raw material processing: pre-treating the potassium chloride raw material and initially crushing it to increase its contact area for subsequent processing;

[0008] Step 2: impurity removal: mixing the treated potassium chloride raw material with a hydrochloric acid solution, stirring, and then performing solid-liquid separation to remove some insoluble impurities and some soluble impurities;

[0009] Step 3: Dissolving and filtering: adding the reactants to the solid phase to obtain a potassium chloride solution, heating and stirring to dissolve the potassium chloride, and filtering after keeping warm to obtain a high-temperature supersaturated potassium chloride mother liquor;

[0010] Step 4, in the crystallization reactor stage, the high-temperature supersaturated potassium chloride mother liquor is first transferred to the crystallization reactor body, and the mother liquor inside the crystallization reactor body is stirred to obtain potassium chloride crystal precipitation. After the crystallization is completed, the potassium chloride crystals in the slurry are discharged from the crystallization reactor body, and the crystals accumulated on the inner wall of the crystallization reactor body are scraped off;

[0011] Step 5: Drying and packaging: The separated potassium chloride crystals are dried to remove moisture adsorbed during the crystallization process to obtain a high-purity potassium chloride product.

[0012] As a preferred technical solution of the present invention, the top of the crystallization kettle body in the step 4 is provided with a drive motor, the inside of the crystallization kettle body is provided with a reaction chamber, and the output end of the drive motor and the bottom end of the interior of the reaction chamber are provided with a stirring fork, the lower end inner wall of the crystallization kettle body is embedded with an electric heating wire, the bottom end of the crystallization kettle body is provided with a discharge chute, the lower end of the reaction chamber and the inner wall of the crystallization kettle body and the edge of the stirring fork are provided with a scraping structure, the scraping structure includes several L-shaped fixed scrapers, the top of the fixed scraper is welded to the lower end of the inner wall of the reaction chamber, the inner wall of the reaction chamber is provided with a collecting box, and the collecting box sidewall Fitting with the inner wall of the reaction chamber, a scraping structure for driving the collection box to rotate is provided between the bottom end of the stirring fork and the side wall of the collection box, the bottom end of the rotating structure is connected to the middle of the collection box, the edge of the fixed scraper moves relative to the surface of the collection box, the fixed scraper is used to clean the crystals on the side wall of the collection box, a vertically arranged reserved groove is provided in the middle of the fixed scraper, the internal rotation of the reserved groove is connected to a rotating column, a scraper is inserted into the interior of the rotating column, the cross-section of the scraper is Y-shaped, the edge of the scraper is in contact with the inner wall of the collection box, the edge of the scraper is used to clean the crystals missed by the fixed scraper, the edge of the scraper is located inside the reserved groove and a number of connecting columns are welded.

[0013] As a preferred technical solution of the present invention, a vertically arranged sliding groove is provided inside the rotating column, and the sliding groove of the rotating column is slidably connected to the scraper, and the end of the scraper pushed by the first telescopic spring is always in contact with the reaction chamber. The outside of each connecting column is sleeved with a first telescopic spring, and the two ends of the first telescopic spring are respectively in contact with the edge of the scraper and the inner wall of the reserved groove, and the diameter of the connecting column is larger than the sliding groove gap of the rotating column.

[0014] As a preferred technical solution of the present invention, a limiting bolt is provided at the top of the fixed scraper, the end of the limiting bolt is connected to the rotating column, and the limiting bolt rotates relative to the fixed scraper, and the two ends of the scraper are respectively rotatably connected to the two ends of the reserved groove.

[0015] As a preferred technical solution of the present invention, a cross bar is welded on the inner wall of the reserved groove, and the cross bar passes through the interior of the scraper. The cross bar is slidably connected to the interior of the scraper, and a second telescopic spring is provided at both ends of the cross bar and on both sides of the scraper.

[0016] As a preferred technical solution of the present invention, the rotating structure includes a fixed frame, which is welded to the middle of the collecting box, and a first bevel gear and a second bevel gear parallel to each other are provided at the bottom axis of the stirring fork, and a third bevel gear is provided on the inner wall of the bottom end of the stirring fork and located between the first bevel gear and the second bevel gear, and the first bevel gear and the second bevel gear are both meshed with the third bevel gear, and two guide rods are inserted into the bottom end of the collecting box, and a rotating disk is provided at the bottom axis of the reaction chamber, the bottom ends of the two guide rods are welded to the rotating surface of the rotating disk, and the top ends of the two guide rods are welded to the second bevel gear, the second bevel gear rotates synchronously with the collecting box, and the bottom end of the collecting box rotates in the opposite direction to the stirring fork, and the stirring fork is used to clean the crystals at the bottom end of the collecting box.

[0017] As a preferred technical solution of the present invention, a central shaft is provided at the bottom axis of the stirring fork, and the end faces of the first bevel gear and the second bevel gear are both provided with connecting sleeves, which are both sleeved on the outside of the central shaft, and the connecting sleeve of the first bevel gear rotates relative to the connecting sleeve of the second bevel gear.

[0018] As a preferred technical solution of the present invention, an adjustment structure is provided between the fixed frame and the bottom end of the crystallization kettle body, and the adjustment structure includes a fixed sleeve, the fixed sleeve is welded to the middle of the discharge chute, and the central axis passes through the interior of the fixed sleeve, the central axis and the fixed sleeve rotate relative to each other, a first connecting block is welded to the outside of the fixed sleeve, and second connecting rods are connected to both sides of the first connecting block. A second connecting block is provided on the outside of the central axis and below the fixed frame, the second connecting block is threadedly connected to the central axis, the first connecting rods are connected to both sides of the second connecting block, and the first connecting rod and the second connecting rod are connected.

[0019] As a preferred technical solution of the present invention, two guide holes are opened at the bottom end of the collection box, the two guide holes are slidably connected to the guide rods respectively, and the side wall of the collection box is slidably connected to the inner wall of the reaction chamber.

[0020] As a preferred technical solution of the present invention, the upper surface of the second connecting block is in rotational contact with the lower surface of the fixing frame, the first connecting block and the second connecting block approach or move away from each other, and the second connecting block is always in contact with the fixing frame.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] A scraping structure is provided. Potassium chloride crystals condense on the surface of the collection box. The edge of the fixed scraper scrapes the inner wall of the collection box, and the Y-shaped scraper cleans the crystals that are not cleaned on the surface of the collection box again to avoid missing crystals on the surface of the collection box and crystals remaining on the surface of the collection box. The crystals on the surface of the collection box are scraped so that high-purity potassium chloride can be discharged;

[0023] The first telescopic spring of the scraping structure can push the scraper to move when the end of the scraper is worn or loose, ensuring that the end of the scraper is always in contact with the side wall of the collection box, thereby cleaning the potassium chloride crystals on the side wall of the collection box more thoroughly.

[0024] A rotating structure is provided, and the rotation of the stirring fork can drive each bevel gear transmission, thereby driving the collection box so that the collection box rotates relative to the fixed scraper and the stirring fork respectively, and the collection box and the stirring fork rotate in opposite directions. The collection box is in contact with the fixed scraper and the stirring fork at the same time, which can quickly clean the potassium chloride crystals on the surface of the collection box;

[0025] An adjustment structure is provided. When the first connecting block and the second connecting block are close to each other, the collection box descends under the action of gravity, causing the fixed scraper and the scraper to scrape the collection box, and the potassium chloride liquid in the gap between the bottom end of the collection box and the bottom end of the reaction chamber is discharged. When the first connecting block and the second connecting block are separated from each other, the collection box contacts the fixed scraper and the stirring fork at the same time, so that the entire side of the collection box can be cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0027] Figure 1 It is the main structure diagram of the present invention;

[0028] Figure 2 Schematic diagram of the inner wall of the reaction chamber of the present invention;

[0029] Figure 3 It is a schematic diagram of the scraping structure of the present invention;

[0030] Figure 4 It is a schematic diagram of the fixed scraper and the limiting bolt of the present invention;

[0031] Figure 5 A schematic diagram of the rotation of the rotating column of the present invention;

[0032] Figure 6 Schematic diagram of the first telescopic spring and the second telescopic spring of the present invention;

[0033] Figure 7 It is a schematic diagram of the rotation structure of the present invention;

[0034] Figure 8 A schematic diagram of the guide rod and the rotating disk of the present invention;

[0035] Figure 9 Schematic diagram of the first bevel gear and the second bevel gear of the present invention;

[0036] Figure 10 It is a schematic diagram of the adjustment structure of the present invention;

[0037] Figure 11 Schematic diagram of the first connecting rod and the second connecting rod of the present invention.

[0038] In the figure: 1. Crystallization kettle body; 2. Driving motor; 3. Electric heating wire; 4. Reaction chamber; 5. Stirring fork; 6. Scraping structure; 61. Fixed scraper; 62. Collecting box; 63. Reserved groove; 64. Limit bolt; 65. Rotating column; 66. Scraping knife; 67. Connecting column; 68. First telescopic spring; 69. Cross bar; 610. Second telescopic spring; 7. Rotating structure; 71. Fixed frame; 72. First bevel gear; 73. Second bevel gear; 74. Guide rod; 75. Rotating disk; 76. Third bevel gear; 77. Connecting sleeve; 78. Guide hole; 79. Center axis; 8. Adjusting structure; 81. Fixed sleeve; 82. First connecting block; 83. Second connecting block; 84. First connecting rod; 85. Second connecting rod; 9. Discharge chute. DETAILED DESCRIPTION

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] Example 1:

[0041] See also Figures 1-11 As shown, a preparation process of high-purity potassium chloride comprises the following steps:

[0042] Step 1: Raw material processing: pre-treating the potassium chloride raw material and initially crushing it to increase its contact area for subsequent processing;

[0043] Step 2: impurity removal: mixing the treated potassium chloride raw material with a hydrochloric acid solution, stirring, and then performing solid-liquid separation to remove some insoluble impurities and some soluble impurities;

[0044] Step 3: Dissolving and filtering: adding the reactants to the solid phase to obtain a potassium chloride solution, heating and stirring to dissolve the potassium chloride, and filtering after keeping warm to obtain a high-temperature supersaturated potassium chloride mother liquor;

[0045] Step 4, in the crystallization reactor stage, the high-temperature supersaturated potassium chloride mother liquor is first transferred to the crystallization reactor body 1, and the mother liquor inside the crystallization reactor body 1 is stirred to obtain potassium chloride crystal precipitation. After the crystallization is completed, the potassium chloride crystals in the slurry are discharged from the crystallization reactor body 1, and the crystals accumulated on the inner wall of the crystallization reactor body 1 are scraped off;

[0046] Step 5: Drying and packaging: The separated potassium chloride crystals are dried to remove moisture adsorbed during the crystallization process to obtain a high-purity potassium chloride product.

[0047] See also Figures 1-6As shown, the top of the crystallization kettle main body 1 in step 4 is provided with a driving motor 2, a reaction chamber 4 is opened inside the crystallization kettle main body 1, and a stirring fork 5 is provided at the output end of the driving motor 2 and the bottom end of the interior of the reaction chamber 4. The inner wall of the lower end of the crystallization kettle main body 1 is embedded with an electric heating wire 3, and the bottom end of the crystallization kettle main body 1 is provided with a discharge chute 9. Potassium chloride solution is put into the crystallization kettle main body 1 for reaction, and the electric heating wire 3 is energized so as to heat the solution in the reaction chamber 4 while stirring it, so that the potassium chloride solution is attached to the lower end of the reaction chamber 4 after crystallization, and potassium chloride crystals with higher purity can be obtained, which can be condensed in the crystallization kettle. The crystals on the inner wall of the crystallization kettle body 1 are discharged from the discharge trough 9. A scraping structure 6 is provided at the lower end of the reaction chamber 4 and between the inner wall of the crystallization kettle body 1 and the edge of the stirring fork 5. The scraping structure 6 includes a plurality of L-shaped fixed scrapers 61. The top of the fixed scraper 61 is welded to the lower end of the inner wall of the reaction chamber 4. The inner wall of the reaction chamber 4 is provided with a collecting box 62. The side wall of the collecting box 62 is fitted with the inner wall of the reaction chamber 4. The collecting box 62 is installed at the bottom end of the interior of the reaction chamber 4 and is restricted to the bottom end of the reaction chamber 4 by a plurality of fixed scrapers 61. A scraping structure for driving the collecting box 62 to rotate is provided between the bottom end of the stirring fork 5 and the side wall of the collecting box 62. 7. The bottom end of the rotating structure 7 is connected to the middle of the collecting box 62. The edge of the fixed scraper 61 moves relative to the surface of the collecting box 62. The fixed scraper 61 is used to clean the crystals on the side wall of the collecting box 62. The rotation of the stirring fork 5 can drive the rotating structure 7 and the collecting box 62 to rotate, so that when the collecting box 62 rotates, the fixed scraper 61 scrapes the surface crystals on the inner wall of the collecting box 62, thereby cleaning the condensed crystals. A vertically arranged reserved groove 63 is opened in the middle of the fixed scraper 61. The internal rotation of the reserved groove 63 is connected to a rotating column 65. A scraper 66 is inserted into the interior of the rotating column 65. The cross-sectional shape of the scraper 66 is Y-shaped. The edge of the scraper 66 contacts the inner wall of the collection box 62. The edge of the scraper 66 is used to clean the crystals missed by the fixed scraper 61. The edge of the scraper 66 is located inside the reserved groove 63 and is welded with several connecting columns 67. Most of the crystals on the surface of the collection box 62 are scraped off by the fixed scraper 61, and a small amount of crystals remaining on the surface of the collection box 62 enter the reserved groove 63 with the collection box 62. At this time, the scraper 66 can scrape the crystals on the surface of the collection box 62, wherein the crystals missed by the collection box 62 are scraped clean by the scraper 66. When the stirring fork 5 contacts the collection box 62, the inner wall of the collection box 62 can also be cleaned.

[0048] See also Figure 3-Figure 5As shown, a vertically arranged sliding groove is provided inside the rotating column 65, and the sliding groove of the rotating column 65 is slidably connected to the scraper 66. The end of the scraper 66 pushed by the first telescopic spring 68 is always in contact with the reaction chamber 4. Under the action of the first telescopic spring 68, the scraper 66 can slide along the sliding groove of the rotating column 65, so that the edge of the scraper 66 is always in contact with the surface of the collection box 62, and the crystals that have not been scraped off by the fixed scraper 61 can be scraped off again. The outside of each connecting column 67 is sleeved with a first telescopic spring 68, and the two ends of the first telescopic spring 68 are respectively in contact with the edge of the scraper 66 and the inner wall of the reserved groove 63. The diameter of the connecting column 67 is larger than the sliding groove gap of the rotating column 65, so that the scraper 66 welded to the connecting column 67 will not fall off from the sliding groove of the rotating column 65, ensuring that the scraper 66 is pushed by the first telescopic spring 68.

[0049] See also Figure 3 As shown, a limiting bolt 64 is provided at the top of the fixed scraper 61, and the end of the limiting bolt 64 is connected to the rotating column 65, and the limiting bolt 64 rotates relative to the fixed scraper 61, and the two ends of the scraper 66 are respectively rotatably connected to the two ends of the reserved groove 63, and the limiting bolt 64 is connected to the top of the rotating column 65, so as not to affect the rotation of the rotating column 65 inside the reserved groove 63, and the inclined scraper 66 is pushed by the first telescopic spring 68 to make the collection box 62 clean more thoroughly.

[0050] See also Figure 6 As shown, a cross bar 69 is welded to the inner wall of the reserved groove 63, and the cross bar 69 passes through the interior of the scraper 66. The cross bar 69 is slidably connected to the interior of the scraper 66. Second telescopic springs 610 are provided at both ends of the cross bar 69 and on both sides of the scraper 66. Under the action of the two second telescopic springs 610, the Y-shaped scraper 66 cleans the inner wall of the collection box 62, and the inner wall of the collection box 62 can be cleaned when the collection box 62 rotates in different directions, so that the scraper 66 remains in an inclined state.

[0051] It should be noted that the potassium chloride solution is placed in the crystallization kettle main body 1 for reaction, and the electric heating wire 3 is energized to stir the solution in the reaction chamber 4 while heating it, so that the potassium chloride solution adheres to the lower end of the reaction chamber 4 after crystallization, and potassium chloride crystals with higher purity can be obtained. The crystals condensed on the inner wall of the crystallization kettle main body 1 can be discharged from the discharge chute 9, and the potassium chloride crystals condense on the surface of the collection box 62. The inner wall of the collection box 62 is scraped by the edge of the fixed scraper 61, and the crystals that are not cleaned on the surface of the collection box 62 are cleaned again by the Y-shaped scraper 66 to avoid missing and remaining on the surface of the collection box 62. When the end of the scraper 66 is worn or the end of the scraper 66 is loose, the scraper 66 can be pushed to move by the first telescopic spring 68 to ensure that the end of the scraper 66 is always in contact with the side wall of the collection box 62, and the potassium chloride crystals on the side wall of the collection box 62 are cleaned more thoroughly.

[0052] See also Figure 2 、 Figure 7-Figure 9 As shown, the rotating structure 7 includes a fixing frame 71, which is welded to the middle of the collecting box 62. The crystals can enter the discharge trough 9 from the fixing frame 71, so that the discharge trough 9 at the bottom end of the reactor is opened, and the crystals are discharged from the discharge trough 9. A first bevel gear 72 and a second bevel gear 73 parallel to each other are provided at the bottom axis of the stirring fork 5. A third bevel gear 76 is provided on the inner wall of the bottom end of the stirring fork 5 and is located between the first bevel gear 72 and the second bevel gear 73. The first bevel gear 72 and the second bevel gear 73 are both meshed with the third bevel gear 76. The stirring fork 5 rotates to drive the first bevel gear 72 to rotate, the first bevel gear 72, the third bevel gear 76 and the second bevel gear 73 rotate, and the second bevel gear 73 and the first bevel gear 72 rotate in opposite directions. The bottom end of the collecting box 62 Two guide rods 74 are inserted, and a rotating disk 75 is provided at the bottom axis of the reaction chamber 4. The bottom ends of the two guide rods 74 are welded to the rotating surface of the rotating disk 75, and the top ends of the two guide rods 74 are welded to the second bevel gear 73. The second bevel gear 73 rotates synchronously with the collecting box 62, and the bottom end of the collecting box 62 rotates in the opposite direction to the stirring fork 5. The stirring fork 5 is used to clean the crystals at the bottom end of the collecting box 62. The rotation of the second bevel gear 73 drives the two guide rods 74 to rotate, and the guide rods 74 drive the collecting box 62 to rotate on the surface of the rotating disk 75, thereby realizing the rotation of the collecting box 62 relative to the fixed scraper 61 and the stirring fork 5. When the inner wall of the collecting box 62 is in contact with the fixed scraper 61 and the stirring fork 5 at the same time, the inner wall of the collecting box 62 can be scraped by the fixed scraper 61 and the stirring fork 5.

[0053] See also Figure 9As shown, a central shaft 79 is provided at the axis of the bottom end of the stirring fork 5, and a connecting sleeve 77 is provided on the end faces of the first bevel gear 72 and the second bevel gear 73. The connecting sleeve 77 is sleeved on the outside of the central shaft 79, and the connecting sleeve 77 of the first bevel gear 72 rotates relative to the connecting sleeve 77 of the second bevel gear 73. A support surface can be provided at the bottom end of the stirring fork 5 and flush with the bottom edge of the second bevel gear 73 to ensure that the second bevel gear 73 can rotate in the support surface without falling, and to ensure that the first bevel gear 72, the second bevel gear 73 and the third bevel gear 76 can rotate normally.

[0054] It should be noted that in order to ensure that the collecting box 62 rotates relative to the fixed scraper 61 and the stirring fork 5, the fixing frame 71, the first bevel gear 72 and the third bevel gear 76 can be driven to rotate by the stirring fork 5, and the collecting box 62 and the stirring fork 5 rotate in opposite directions, so that the potassium chloride crystals on the surface of the collecting box 62 can be quickly cleaned.

[0055] See also Figure 2 and Figure 10 and Figure 11 As shown, an adjustment structure 8 is provided between the fixed frame 71 and the bottom end of the crystallization kettle body 1, and the adjustment structure 8 includes a fixed sleeve 81, the fixed sleeve 81 is welded to the middle of the discharge chute 9, and the central axis 79 passes through the interior of the fixed sleeve 81, the central axis 79 and the fixed sleeve 81 rotate relative to each other, and a first connecting block 82 is welded to the outside of the fixed sleeve 81, and second connecting rods 85 are connected to both sides of the first connecting block 82. The position of the first connecting block 82 does not change, and a second connecting block 83 is provided on the outside of the central axis 79 and located below the fixed frame 71. The second connecting block 83 is threadedly connected to the central axis 79. The second connecting block 83 is connected to the first connecting rod 84 on both sides. The second connecting block 83 can be threadedly connected by rotating the central axis 79, so that the second connecting block 83 can be raised and lowered along the central axis 79, and the distance between the first connecting block 82 and the second connecting block 83 changes. The first connecting rod 84 and the second connecting rod 85 are connected, and the first connecting block 82 can be raised and lowered to press against the fixing frame 71 of the collecting box 62, and the distance between the collecting box 62 and the stirring fork 5 can be adjusted so that the collecting box 62 and the stirring fork 5 are in a fitted state or the collecting box 62 and the stirring fork 5 are in a separated state.

[0056] See also Figures 9-11As shown, two guide holes 78 are provided at the bottom end of the collecting box 62, and the two guide holes 78 are respectively slidably connected to the guide rods 74, and the side walls of the collecting box 62 are slidably connected to the inner wall of the reaction chamber 4; the upper surface of the second connecting block 83 is in rotational contact with the lower surface of the fixing frame 71, and the first connecting block 82 and the second connecting block 83 approach or move away from each other, and the second connecting block 83 is always in contact with the fixing frame 71. When the first connecting block 82 and the second connecting block 83 are close to each other, the second connecting block 83 drives the collecting box 62 to descend, thereby separating the reserved groove 63 from the stirring fork 5. At this time, the inner wall of the collecting box 62 can be cleaned by the fixed scraper 61 and the scraper 66. When the first connecting block 82 and the second connecting block 83 are away from each other, the second connecting block 83 pushes the collecting box 62 to rise, so that the bottom end of the collecting box 62 contacts the stirring fork 5, and the side walls of the collecting box 62 contact the fixed scraper 61 and the scraper 66, so that the inner wall of the collecting box 62 can be scraped.

[0057] It should be noted that, in the initial state, the inner wall of the collecting box 62 is in contact with the fixed scraper 61 and the stirring fork 5, so that the stirring fork 5 and the rotating structure 7 can drive the collecting box 62 to rotate, so that the fixed scraper 61 and the stirring fork 5 can be used to scrape and clean the surface crystals of the collecting box 62. At this time, the first connecting block 82 and the second connecting block 83 are away from each other, so that the second connecting block 83 is against the fixed frame 71 of the collecting box 62, and will not affect the rotation of the collecting box 62. When the central axis 79 is rotated, the central axis 79 and the second connecting block 83 will rotate relative to each other, and the second connecting block 83 will descend along the direction of the central axis 79, so that the collecting box 62 descends under the action of gravity, so that the reserved groove 63 only rotates while in contact with the fixed scraper 61. During the descent of the collecting box 62, the potassium chloride solution between the collecting box 62 and the reaction chamber 4 can be discharged.

[0058] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A process for preparing high-purity potassium chloride, characterized in that, The following steps are involved: Step 1: Raw material processing: pre-treating the potassium chloride raw material and initially crushing it; Step 2: impurity removal: mixing the treated potassium chloride raw material with a hydrochloric acid solution, stirring, and performing solid-liquid separation to remove some insoluble impurities and some soluble impurities; Step 3: Dissolving and filtering: adding the reactants to the solid phase to obtain a potassium chloride solution, heating and stirring to dissolve the potassium chloride, and filtering after keeping warm to obtain a high-temperature supersaturated potassium chloride mother liquor; Step 4, in the crystallization reactor stage, the high-temperature supersaturated potassium chloride mother liquor is first transferred to the crystallization reactor body (1), and the mother liquor inside the crystallization reactor body (1) is stirred to obtain potassium chloride crystal precipitation. After the crystallization is completed, the potassium chloride crystals in the slurry are discharged from the crystallization reactor body (1), and the crystals accumulated on the inner wall of the crystallization reactor body (1) are scraped off; Step 5: Drying and packaging: Drying the separated potassium chloride crystals to remove moisture adsorbed during the crystallization process to obtain a high-purity potassium chloride product.

2. A preparation technology for high-purity potassium chloride according to claim 1, characterized in that, The crystallization kettle body (1) in the step 4 is provided with a driving motor (2) at the top, a reaction chamber (4) is provided inside the crystallization kettle body (1), and a stirring fork (5) is provided at the output end of the driving motor (2) and located at the bottom end of the reaction chamber (4). An electric heating wire (3) is embedded in the inner wall of the lower end of the crystallization kettle body (1), and a discharge trough (9) is provided at the bottom end of the crystallization kettle body (1). A scraping structure (6) is provided at the lower end of the reaction chamber (4) and located between the inner wall of the crystallization kettle body (1) and the edge of the stirring fork (5). The scraping structure (6) includes a plurality of L-shaped fixed scrapers (61), the top end of the fixed scraper (61) is welded to the lower end of the inner wall of the reaction chamber (4), and the inner wall of the reaction chamber (4) is provided with a collecting box (62), the side wall of the collecting box (62) is in contact with the inner wall of the reaction chamber (4), and the bottom of the stirring fork (5) is provided with a collecting box (62). A scraping structure (7) for driving the collection box (62) to rotate is provided between the end and the side wall of the collection box (62); the bottom end of the rotating structure (7) is connected to the middle of the collection box (62); the edge of the fixed scraper (61) moves relative to the surface of the collection box (62); the fixed scraper (61) is used to clean the crystals on the side wall of the collection box (62); a vertically arranged reserved groove (63) is provided in the middle of the fixed scraper (61); a rotating column (65) is connected to the inside of the reserved groove (63); a scraping blade (66) is inserted into the inside of the rotating column (65); the cross-section of the scraping blade (66) is Y-shaped; the edge of the scraping blade (66) contacts the inner wall of the collection box (62); the edge of the scraping blade (66) is used to clean the crystals missed by the fixed scraper (61); a plurality of connecting columns (67) are welded to the edge of the scraping blade (66) and located inside the reserved groove (63).

3. A preparation technology for high-purity potassium chloride according to claim 2, characterized in that, A vertically arranged sliding groove is provided inside the rotating column (65), and the sliding groove of the rotating column (65) is slidably connected to the scraper (66). The end of the scraper (66) pushed by the first telescopic spring (68) is always in contact with the reaction chamber (4). The outside of each connecting column (67) is sleeved with a first telescopic spring (68), and the two ends of the first telescopic spring (68) are respectively in contact with the edge of the scraper (66) and the inner wall of the reserved groove (63). The diameter of the connecting column (67) is larger than the sliding groove gap of the rotating column (65).

4. A preparation technology for high-purity potassium chloride according to claim 3, characterized in that, A limiting bolt (64) is provided at the top end of the fixed scraper (61), the end of the limiting bolt (64) is connected to the rotating column (65), and the limiting bolt (64) rotates relative to the fixed scraper (61), and the two ends of the scraper (66) are respectively rotatably connected to the two ends of the reserved groove (63).

5. A preparation technology for high-purity potassium chloride according to claim 4, characterized in that, A cross bar (69) is welded to the inner wall of the reserved groove (63), and the cross bar (69) passes through the interior of the scraper (66). The cross bar (69) is slidably connected to the interior of the scraper (66), and a second telescopic spring (610) is sleeved on both ends of the cross bar (69) and on both sides of the scraper (66).

6. A preparation process for high-purity potassium chloride according to claim 5, characterized in that, The rotating structure (7) includes a fixing frame (71), the fixing frame (71) is welded to the middle of the collecting box (62), a first bevel gear (72) and a second bevel gear (73) are provided at the bottom axis of the stirring fork (5), and a third bevel gear (76) is provided on the inner wall of the bottom end of the stirring fork (5) and is located between the first bevel gear (72) and the second bevel gear (73), and the first bevel gear (72) and the second bevel gear (73) are both meshed with the third bevel gear (76). Two guide rods (74) are inserted into the bottom end of (62), and a rotating disk (75) is provided at the bottom axis of the reaction chamber (4). The bottom ends of the two guide rods (74) are welded to the rotating surface of the rotating disk (75), and the top ends of the two guide rods (74) are welded to the second bevel gear (73). The second bevel gear (73) rotates synchronously with the collection box (62). The bottom end of the collection box (62) rotates in the opposite direction to the stirring fork (5). The stirring fork (5) is used to clean the crystals at the bottom end of the collection box (62).

7. A preparation process for high-purity potassium chloride according to claim 6, characterized in that, A central shaft (79) is provided at the bottom axis of the stirring fork (5), and end surfaces of the first bevel gear (72) and the second bevel gear (73) are both provided with connecting sleeves (77). The connecting sleeves (77) are both sleeved on the outside of the central shaft (79), and the connecting sleeve (77) of the first bevel gear (72) rotates relative to the connecting sleeve (77) of the second bevel gear (73).

8. A preparation process for high-purity potassium chloride according to claim 7, characterized in that, An adjustment structure (8) is provided between the fixed frame (71) and the bottom end of the crystallization kettle body (1), and the adjustment structure (8) includes a fixed sleeve (81), the fixed sleeve (81) is welded to the middle of the discharge trough (9), and the central axis (79) passes through the interior of the fixed sleeve (81), the central axis (79) and the fixed sleeve (81) rotate relative to each other, a first connecting block (82) is welded to the outside of the fixed sleeve (81), and second connecting rods (85) are connected to both sides of the first connecting block (82), a second connecting block (83) is provided outside the central axis (79) and located below the fixed frame (71), the second connecting block (83) is threadedly connected to the central axis (79), and first connecting rods (84) are connected to both sides of the second connecting block (83), and the first connecting rod (84) and the second connecting rod (85) are connected.

9. A preparation process for high-purity potassium chloride according to claim 8, characterized in that, The bottom end of the collecting box (62) is provided with two guide holes (78), the two guide holes (78) are respectively slidably connected to the guide rods (74), and the side wall of the collecting box (62) is slidably connected to the inner wall of the reaction chamber (4).

10. A process for preparing high-purity potassium chloride according to claim 9, characterized in that, The upper surface of the second connecting block (83) is in rotational contact with the lower surface of the fixing frame (71), the first connecting block (82) and the second connecting block (83) move closer to or farther away from each other, and the second connecting block (83) is always in contact with the fixing frame (71).

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