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CN-121971879-A - Multi-stage fractional crystallization device for preparing 3N electronic-grade strontium chloride

CN121971879ACN 121971879 ACN121971879 ACN 121971879ACN-121971879-A

Abstract

The invention discloses a multistage fractional crystallization device for preparing 3N electronic-grade strontium chloride, which comprises a dissolving tank, a filtering tank, a frame, a primary crystallizer, a secondary crystallizer, a solid-liquid separation device, a guide pipe and a multistage fractional crystallization device, wherein the outer wall of the dissolving tank is vertically connected with a liquid supply pipe, the filtering tank is arranged on one side of the dissolving tank, the lower end of the dissolving tank is provided with a liquid outlet, the liquid outlet is communicated with the filtering tank through a liquid suction pump, the frame is fixed outside the filtering tank, the primary crystallizer and the secondary crystallizer are vertically assembled on the frame, the discharge pipe is vertically connected below the primary crystallizer and the secondary crystallizer, the solid-liquid separation device is fixed on one side of the frame close to the secondary crystallizer, the guide pipe is horizontally connected below the solid-liquid separation device, and the multistage fractional crystallization device adopted by the invention utilizes the solubility difference at different temperatures to separate impurities and purify the strontium chloride through stage-by-stage crystallization.

Inventors

  • SHEN JING
  • WANG QIANG

Assignees

  • 重庆新申世纪新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. A multi-stage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride, comprising: A liquid supply pipe (12) is vertically connected to the outer wall of the dissolving tank (1); the filtering tank (11) is arranged at one side of the dissolving tank (1), the lower end of the dissolving tank (1) is provided with a liquid outlet, and the liquid outlet is communicated with the filtering tank (11) through a liquid pump (13); a frame fixed outside the filter tank (11); The primary crystallizer (2) and the secondary crystallizer (3) are vertically assembled on the frame, one side of the filter tank (11) is connected with a switching pipe (14), and the other end of the switching pipe (14) is connected with the primary crystallizer (2); the discharge pipe (15) is vertically connected below the primary crystallizer (2) and the secondary crystallizer (3), the other end of the discharge pipe (15) is respectively connected with a first conveying pump (16) and a second conveying pump (17), and the other end of the first conveying pump (16) is connected with the secondary crystallizer (3); the solid-liquid separation device (18) is fixed on one side, close to the secondary crystallizer (3), of the frame (14), and the other end of the second conveying pump (17) is connected with the solid-liquid separation device (18); And the material guiding pipe (19) is horizontally connected below the solid-liquid separation device (18).
  2. 2. The multistage fractional crystallization device for preparing 3N electronic-grade strontium chloride according to claim 1, wherein a heating unit and a stirring device are arranged in the dissolution tank (1), and the heating unit adopts a plurality of electric heating pipes which are distributed in a arrayed manner; The filter tank (11) is internally provided with a multi-stage filter element.
  3. 3. A multistage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride according to claim 1, characterized in that said primary crystallizer (2) comprises: a crystallization tank (21) is internally provided with an interlayer, and a crystallization cavity (22) and a filtrate cavity (23) are respectively arranged above and below the interlayer; The heat preservation cavity (24) is formed in the inner wall of the crystallization tank (21), the upper end of the crystallization tank (21) is vertically connected with a liquid guide pipe (25), and the liquid guide pipe (25) is communicated with the heat preservation cavity (24); a flow pipe (26) vertically connected below the crystallization tank (21) and one end of which is communicated with the heat preservation cavity (24); the scraper shaft (27) is vertically and rotatably connected in the crystallization cavity (22), and the scraper shaft (27) is of a U-shaped structure; a stirrer (28) which is connected in a tilting manner in the crystallization chamber (22); The filtering membrane (29) is arranged in the filtrate cavity (23), a conveying pipe (210) is vertically connected below the crystallization tank (21), the upper end of the conveying pipe (210) is connected to the middle part of the filtering membrane (29), and the discharge pipe (15) is connected to the lower part of the filtrate cavity.
  4. 4. A multi-stage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride according to claim 3, wherein a valve hole (211) is opened in the middle of the interlayer, and a valve shaft is vertically and slidingly connected in the valve hole (211); a plurality of oscillators (212) are arranged on the circumference below the inside of the crystallization tank (21), each oscillator is obliquely and fixedly penetrated on the side wall of the crystallization tank (21), and the output end of each oscillator (212) is connected with the filtering membrane (29).
  5. 5. A multistage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride according to claim 1, characterized in that said secondary crystallizer (3) comprises: An overflow cavity (32) is arranged above the inside of the crystallization kettle (31), a pipe hole (33) is formed in the side wall of the overflow cavity (32), and the first conveying pump (16) is communicated with the pipe hole (33) in a sealing manner through a pipeline; the drainage seat (34) is fixed in the overflow cavity (32) through a plurality of brackets; The radial flow channels (35) are circumferentially distributed on the drainage seat (34); The main support column (36) is vertically connected to the middle part of the drainage seat (34); A plurality of crystallization trays (37) arranged in a row, each crystallization tray (37) being distributed along the axial direction of the main column (36); And one end of the reflux pipe (38) is connected below the crystallization kettle (31), the other end of the reflux pipe is communicated with the overflow cavity (32), and a reflux pump is arranged on the reflux pipe (38).
  6. 6. The multi-stage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride according to claim 5, wherein a plurality of guide shafts (38) corresponding to the crystallization discs (37) are distributed on the main support (36), hoops are connected outside the guide shafts (38) in a universal rotation manner, and each crystallization disc (37) is fixed with the hoops; a plurality of connecting rods (39) are connected between two adjacent crystallization plates (37), and two ends of each connecting rod (39) are respectively hinged with each crystallization plate (37).
  7. 7. The multistage fractional crystallization device for preparing 3N electronic-grade strontium chloride according to claim 5, wherein a plurality of spiral liquid channels (4) are distributed on the inner wall of the crystallization kettle (31), one end of each spiral liquid channel (4) is communicated with a liquid inlet channel (41), and the other end of each spiral liquid channel is communicated with a liquid discharge channel (42).
  8. 8. The multi-stage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride according to claim 6, wherein a membrane net is laid on the crystallization tray (37), and a clear water pipe is connected to the outside of the crystallization kettle (31).
  9. 9. The multistage fractional crystallization device for preparing 3N electronic-grade strontium chloride according to claim 6, wherein a shaft cylinder (5) is fixed below the inside of the crystallization kettle (31), a plurality of sliding fixed shafts (51) are distributed on the inner circumference of the shaft cylinder (5), transmission rods (52) are hinged to the upper ends of the fixed shafts (51), and the other ends of the transmission rods (52) are connected with the bottommost crystallization tray (37); A guide disc is connected to the lower part of the shaft cylinder (5) in a universal rotation manner, a hinge shaft (52) is connected to the lower end of each fixed shaft (51), and one end of the hinge shaft (52) is connected with the guide disc through a spherical roller; and a swash plate (53) is rotatably connected below the shaft cylinder (5), and the upper end of the swash plate (53) is abutted against the guide plate.
  10. 10. The multistage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride according to claim 9, characterized in that the fixed shaft (51) consists of two sliding shafts assembled in a sliding manner, a supporting spring is sleeved between the sliding shafts, and a vibrator (54) is arranged between the sliding shafts; and a conductive ring (55) is arranged outside each fixed shaft in the shaft cylinder (5), and a conductive terminal is arranged on the side wall of the sliding shaft below, and is contacted with the conductive ring (55) in sliding along with the fixed shafts (51).

Description

Multi-stage fractional crystallization device for preparing 3N electronic-grade strontium chloride Technical Field The invention belongs to the technical field of strontium chloride production, and particularly relates to a multistage fractional crystallization device for preparing 3N electronic-grade strontium chloride. Background High purity strontium chloride, especially electronic grade products with purity up to 3N (99.9%) and above, is widely used for preparing high-end fluorescent materials (such as OLED display materials), special optical glass and the like. At present, the traditional single-stage crystallization is not thorough in impurity separation, particularly calcium, barium and other impurities with the ion radius similar to that of strontium are difficult to effectively separate, the purity of the product is often 2N (99%) and wanders in the level, the batch fluctuation is large, and the rapid cooling or temperature control of the single-stage crystallization is not accurate and easily causes burst nucleation, so that a large amount of fine crystals are generated. These fine crystals are difficult to filter, have low washing efficiency, are easy to wrap mother liquor and impurities, and affect the physical properties and purity of the final product. Therefore, there is a need to provide a multi-stage fractional crystallization apparatus for preparing 3N electronic grade strontium chloride to solve the problems set forth in the background art. Disclosure of Invention In order to achieve the above purpose, the invention provides a multi-stage fractional crystallization device for preparing 3N electronic grade strontium chloride, which comprises: The outer wall of the dissolving tank is vertically connected with a liquid supply pipe; The filtering tank is arranged at one side of the dissolving tank, the lower end of the dissolving tank is provided with a liquid outlet, and the liquid outlet is communicated with the filtering tank through a liquid suction pump; A frame fixed outside the filter tank; the first-stage crystallizer and the second-stage crystallizer are vertically assembled on the frame, one side of the filter tank is connected with a transfer pipe, and the other end of the transfer pipe is connected with the first-stage crystallizer; the discharge pipe is vertically connected below the primary crystallizer and the secondary crystallizer, the other end of the discharge pipe is respectively connected with a first conveying pump and a second conveying pump, and the other end of the first conveying pump is connected with the secondary crystallizer; the solid-liquid separation device is fixed on one side of the frame, which is close to the secondary crystallizer, and the other end of the second conveying pump is connected with the solid-liquid separation device; the material guiding pipe is horizontally connected below the solid-liquid separation device. Further, preferably, a heating unit and a stirring device are arranged in the dissolution tank, and the heating unit adopts a plurality of electric heating pipes which are distributed in a arrayed manner; the filter tank is internally provided with a multi-stage filter element. Further, preferably, the primary crystallizer includes: the crystallization tank is internally provided with an interlayer, and a crystallization cavity and a filtrate cavity are respectively arranged above and below the interlayer; the heat preservation cavity is formed in the inner wall of the crystallization tank, the upper end of the crystallization tank is vertically connected with a liquid guide pipe, and the liquid guide pipe is communicated with the heat preservation cavity; the flow pipe is vertically connected below the crystallization tank, and one end of the flow pipe is communicated with the heat preservation cavity; The scraper shaft is vertically and rotatably connected in the crystallization cavity and is in a U-shaped structure; The stirrer is obliquely and rotatably connected in the crystallization cavity; the filtering membrane is arranged in the filtrate cavity, a conveying pipe is vertically connected below the crystallization tank, the upper end of the conveying pipe is connected to the middle of the filtering membrane, and the discharge pipe is connected to the lower part of the filtrate cavity. Further, preferably, a valve hole is formed in the middle of the interlayer, and a valve shaft is vertically and slidably connected in the valve hole; the circumference below the inside of the crystallization tank is provided with a plurality of oscillators, each oscillator is obliquely and fixedly penetrated on the side wall of the crystallization tank, and the output end of each oscillator is connected with a filtering membrane. Further, preferably, the secondary crystallizer includes: An overflow cavity is arranged above the inside of the crystallization kettle, a pipe hole is formed in the side wall of the overflow cavity, and the first conveyin