Sodium antimonate preparation device and screening mechanism thereof

Abstract

The utility model discloses a sodium antimonate preparation device and a screening mechanism thereof. The sodium antimonate preparation device comprises a reaction kettle, a sodium hydroxide storage tank, a powder conveying mechanism, a hydrogen peroxide storage tank, a soft water storage tank, a centrifugal machine, a filtrate storage tank, a drying machine and a stockpiling warehouse, the powder conveying mechanism, the sodium hydroxide storage tank, the hydrogen peroxide storage tank and the soft water storage tank are used for supplying raw materials into the reaction kettle; the raw materials are conveyed to the centrifugal machine after reaction in the reaction kettle; liquid separated by the centrifugal machine is output to a filtrate storage tank, and formed solid is output to a drying machine and dried by the drying machine; an evaporator is arranged in the filtrate storage tank, and the filtrate is output to the reaction kettle after being heated, evaporated and concentrated by the evaporator. The raw materials in the filtrate are used again for reaction, so that the utilization rate of the raw materials is improved. And by arranging the screening mechanism, unqualified sodium antimonate is removed. And packaging the qualified sodium antimonate for sale.

Description

Technical Field

[0001] This utility model relates to an apparatus for preparing sodium antimonate, belonging to the field of chemical technology. Background Technology

[0002] Sodium antimonate is commonly used as a high-grade glass clarifying and decolorizing agent, and a flame retardant for materials. When used as a flame retardant, sodium antimonate has advantages such as low dosage and good flame-retardant effect, thus its application is widespread. However, the sodium-alkali hydrogen peroxide hydration production process has drawbacks such as high raw material consumption and substandard product particle size. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a device for preparing sodium antimonate.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a sodium antimonate preparation apparatus, comprising a reaction vessel, the sodium antimonate preparation apparatus further comprising a sodium hydroxide storage tank, a powder conveying mechanism, a hydrogen peroxide storage tank, a soft water storage tank, a centrifuge, a filtrate storage tank, a dryer, and a stockpile; the powder conveying mechanism, sodium hydroxide storage tank, hydrogen peroxide storage tank, and soft water storage tank are used to supply raw materials to the reaction vessel; after the raw materials have reacted in the reaction vessel, they are conveyed to the centrifuge; the liquid formed after separation by the centrifuge is output to the filtrate storage tank, and the solid formed is output to the dryer for drying; the filtrate storage tank is equipped with an evaporator, and the filtrate is heated, evaporated, concentrated, and then output to the reaction vessel.

[0005] The present invention is further configured such that: the sodium antimonate preparation apparatus includes a washing liquid storage tank; the solid product from the centrifuge is rinsed with water inside the centrifuge; the washing liquid storage tank is used to collect the washing liquid discharged from the centrifuge and output the washing liquid to the reaction vessel; a stirring mechanism is installed inside the reaction vessel; substandard sodium antimonate produced by the dryer is output to a stockpile, and qualified sodium antimonate is output to a crushing mechanism; the sodium antimonate produced by the crushing mechanism is output to a screening mechanism.

[0006] The present invention is further configured as follows: the screening mechanism includes a frame, bearings, a rotating shaft, connecting rods, a screen, a motor, a drive wheel, a driven wheel, a belt, an opening, a mounting plate, a hinge, a locking fastener, and a cover. The rotating shaft is rotatably connected to both ends of the frame via a pair of bearings. A pair of mounting plates are fixedly connected to the rotating shaft relative to each other. The edges of the pair of mounting plates are fixedly connected via several connecting rods. The opening is connected to an adjacent pair of connecting rods. One side of the opening is rotatably connected to the edge of the cover via a hinge, and the other side of the opening is connected to the other edge of the cover via a locking fastener. The screen is fixedly connected to the outside of the pair of mounting plates and connecting rods. The motor is connected to the frame. A drive wheel is connected to the output shaft of the motor. A driven wheel is connected to one end of the rotating shaft. The driven wheel and the drive wheel are rotatably connected via a belt.

[0007] Compared with existing technologies, the beneficial effects of this utility model are as follows: Raw materials are supplied to the reaction vessel via a powder conveying mechanism, a sodium hydroxide storage tank, a hydrogen peroxide storage tank, and a soft water storage tank; a chemical reaction takes place in the reaction vessel to form sodium antimonate. The solid and liquid are separated by a centrifuge; the liquid is collected in a filtrate storage tank, heated and concentrated by an evaporator, and then output to the reaction vessel. The raw materials in the filtrate are reused for further reaction, improving the utilization rate of the raw materials. A sieving mechanism is used to remove substandard sodium antimonate. The qualified sodium antimonate is then packaged and sold. Attached Figure Description

[0008] Fig. 1 This is a schematic diagram of the sodium antimonate preparation apparatus according to a preferred embodiment of the present invention;

[0009] Fig. 2 This is a schematic diagram of the screening mechanism;

[0010] Fig. 3 This is a schematic diagram of the three-dimensional structure of the screening mechanism.

[0011] In the diagram: 51. Frame; 52. Bearing; 53. Shaft; 54. Connecting rod; 55. Motor; 56. Drive wheel; 57. Driven wheel; 58. Belt; 59. Inlet; 60. Mounting plate; 61. Hinge; 62. Locking fastener; 63. Cover; 64. Screen. Detailed Implementation

[0012] Example 1: See Appendix Figs. 1-3 As shown. An apparatus for preparing sodium antimonate includes a reaction vessel, and further includes a sodium hydroxide storage tank, a powder conveying mechanism, a hydrogen peroxide storage tank, a soft water storage tank, a centrifuge, a filtrate storage tank, a dryer, and a stockpile. A stirring mechanism is installed inside the reaction vessel. The powder conveying mechanism, sodium hydroxide storage tank, hydrogen peroxide storage tank, and soft water storage tank are used to supply raw materials to the reaction vessel. After the raw materials have reacted in the reaction vessel, they are conveyed to the centrifuge. The liquid formed after separation by the centrifuge is output to the filtrate storage tank, and the solid formed is output to the dryer for drying. An evaporator is installed in the filtrate storage tank, and the filtrate is heated, evaporated, concentrated, and then output to the reaction vessel.

[0013] The sodium antimonate preparation apparatus also includes a washing solution storage tank. The solid product from the centrifuge is rinsed with water inside the centrifuge, and the washing solution storage tank is used to collect the washing solution discharged from the centrifuge and output the washing solution to the reaction vessel. Further collection of unconsumed raw materials and re-reaction in the reaction vessel improves the utilization rate of raw materials and reduces the consumption of raw materials.

[0014] Raw materials are supplied to the reactor via a powder conveying mechanism, a sodium hydroxide storage tank, a hydrogen peroxide storage tank, and a soft water storage tank. A chemical reaction takes place in the reactor to form sodium antimonate. The solid and liquid components are separated by a centrifuge. The liquid is collected in a filtrate storage tank, then concentrated by heating in an evaporator before being returned to the reactor. The raw materials in the filtrate are then reused in the reaction, improving the utilization rate of the raw materials. A sieving mechanism removes substandard sodium antimonate. The qualified sodium antimonate is then packaged and sold.

[0015] The substandard sodium antimonate produced by the dryer is sent to the stockpile, while the qualified sodium antimonate is sent to the crushing mechanism. The sodium antimonate produced by the crushing mechanism is then sent to the screening mechanism.

[0016] In this embodiment, the operation steps are as follows:

[0017] Step 1: Slurry Preparation. Add approximately 550 kg of a 30% NaOH aqueous solution to the reactor and heat to 70 ± 10 °C with stirring. Then add approximately 600 kg of antimony white solution to the reactor and continue stirring. This step is an exothermic reaction, and the temperature can eventually be raised to 90–100 °C. The reaction time is 60 minutes. The molar ratio of antimony trioxide, sodium hydroxide, water, and hydrogen peroxide is 1:2:3.5:3.5.

[0018] Step 2: Oxidation reaction stage. Continue to gradually add 245 kg of hydrogen peroxide to the reactor to promote oxidation and generate sodium antimonate solution. After adding the hydrogen peroxide solution, gradually lower the temperature to 60°C. The oxidation reaction time is 50 minutes.

[0019] Step 3: After the reaction has reached the specified time, stop stirring and maintain the temperature at 95℃ for product crystallization for about 30 minutes. Then let it stand and cool to 60℃ for the crystallization and precipitation stage.

[0020] The main reaction inside the reactor is the synthesis of sodium antimonate; hydrogen peroxide decomposes rapidly at 100℃, resulting in hydrogen peroxide loss and the generation of O2 gas. The specific reaction formula is as follows:

[0021] ①The main reaction equation in the production process of sodium antimonate (pyro)antimonate is:

[0022] Sb2O3+2NaOH+2H2O2+3H2O=2NaSb(OH)6

[0023] ②The decomposition reaction formula of hydrogen peroxide (H2O2) is as follows:

[0024] 2H₂O₂=2H₂O+O₂↑

[0025] Step 4: Centrifugal Separation Stage. The sodium antimonate slurry undergoes solid-liquid separation using a centrifuge. The solid product is washed with water inside the centrifuge, yielding wet sodium antimonate. The washing water is collected in a washing liquid storage tank. The separated filtrate is collected in a filtrate storage tank, then heated and concentrated to 50% in an evaporator before being returned to the reaction vessel.

[0026] The purpose of washing is to remove the alkaline solution and ensure that the product does not clump during the drying process. Generally, the product is washed 2 to 3 times, and about 0.5 tons of washing water are consumed per ton of product.

[0027] Step 5: The wet sodium antimonate is sent to a dryer and dried at 90-110℃ until the product has a moisture content of 0.3% before packaging. A vacuum drum dryer is used to dry the product.

[0028] Step 6: Crushing and screening.

[0029] After the above steps, compared with the existing sodium alkali method for hydrogen peroxide hydration, the yield of qualified sodium antimonate increases by 5%, the purity increases by 3%, and the reaction is more complete and stable. Raw material utilization is also higher.

[0030] Example 2: See Appendix Figs. 1-3 As shown. This utility model also provides a sieving mechanism for a sodium antimonate preparation apparatus, including bearings 52, a rotating shaft 53, connecting rods 54, a screen 64, a motor 55, a driving wheel 56, a driven wheel 57, a belt 58, an opening 59, mounting plates 60, hinges 61, locking fasteners 62, and a cover 63. The rotating shaft 53 is rotatably connected to both ends of the frame 51 via a pair of bearings 52. A pair of mounting plates 60 are fixedly connected to the rotating shaft 53, and the edges of the pair of mounting plates 60 are fixedly connected via several connecting rods 54. The opening 59 is connected to a pair of adjacent connecting rods 54. One side of the opening 59 is rotatably connected to the edge of the cover 63 via a hinge 61, and the other side of the opening 59 is connected to the other edge of the cover 63 via a locking fastener 62. The screen 64 is fixedly connected to the outside of a pair of mounting plates 60 and connecting rods 54. The motor 55 is connected to the frame 51. The output shaft of the motor 55 is connected to a drive wheel 56, and one end of the rotating shaft 53 is connected to a driven wheel 57. The driven wheel 57 and the drive wheel 56 are rotatably connected via a belt 58.

[0031] In summary, the method of using the sieving mechanism of the sodium antimonate preparation device shown in this utility model is as follows: Open the cover 63 and load the dried sodium antimonate through the opening 59. Then, rotate the cover 63 around the hinge 61 to cover the opening 59, and lock the locking fastener 62 to connect the cover 63 and the opening 59 together. Start the motor 55, the driving wheel 56 drives the driven wheel 57 to rotate, and the driven wheel 57 drives the rotating shaft 53 to rotate. Since the mounting plate 60 is fixedly connected to the rotating shaft 53, the mounting plate 60 rotates with the rotating shaft 53. The sodium antimonate flips over on the screen 64, and small particles of sodium antimonate pass through the screen 64. Large particles of sodium antimonate remain inside the screen 64. Thus, qualified sodium antimonate is screened out. The edge of the screen 64 is fixedly connected to the two mounting plates 60 by screws. The opening 59 is not covered by the screen 64. Several connecting rods 54 support the screen 64. After screening, stop the motor 55 from rotating. Open the locking fastener 62. Rotate the cover 63 in the opposite direction around the hinge 61 to expose the opening 59. With the opening 59 facing downwards, large particles of sodium antimonate are discharged.

Claims

1. An apparatus for preparing sodium antimonate, comprising a reaction vessel, characterized in that, The sodium antimonate preparation apparatus also includes a sodium hydroxide storage tank, a powder conveying mechanism, a hydrogen peroxide storage tank, a soft water storage tank, a centrifuge, a filtrate storage tank, a dryer, a crushing mechanism, and a stockpile. The powder conveying mechanism, sodium hydroxide storage tank, hydrogen peroxide storage tank, and soft water storage tank are used to supply raw materials to the reactor. After the raw materials have reacted in the reactor, they are conveyed to the centrifuge. The liquid formed by the centrifuge is output to the filtrate storage tank, and the solid formed is output to the dryer for drying. The filtrate storage tank is equipped with an evaporator, and the solid is heated, evaporated, concentrated, and then output to the reactor.

2. The apparatus for preparing sodium antimonate according to claim 1, characterized in that, The sodium antimonate preparation apparatus also includes a washing liquid storage tank. The solid product of the centrifuge is rinsed with water inside the centrifuge. The washing liquid storage tank is used to collect the washing liquid discharged from the centrifuge and output the washing liquid to the reaction vessel.

3. The apparatus for preparing sodium antimonate according to claim 1, characterized in that, The reactor is equipped with a stirring mechanism.

4. The apparatus for preparing sodium antimonate according to claim 1, characterized in that, The substandard sodium antimonate produced by the dryer is output to the stockpile, while the qualified sodium antimonate is output to the crushing mechanism.

5. The apparatus for preparing sodium antimonate according to claim 4, characterized in that, The sodium antimonate produced by the crushing mechanism is output to the screening mechanism.

6. The apparatus for preparing sodium antimonate according to claim 5, characterized in that, The screening mechanism includes a frame, bearings, a rotating shaft, connecting rods, a screen, a motor, a drive wheel, a driven wheel, a belt, an opening, mounting plates, hinges, locking fasteners, and a cover. The rotating shaft is rotatably connected to both ends of the frame via a pair of bearings. A pair of mounting plates are fixedly connected to the rotating shaft, and the edges of the pair of mounting plates are fixedly connected via several connecting rods. The opening is connected to an adjacent pair of connecting rods. One side of the opening is rotatably connected to the edge of the cover via a hinge, and the other side of the opening is connected to the other edge of the cover via a locking fastener. The screen is fixedly connected to the outside of the pair of mounting plates and connecting rods. The motor is connected to the frame, and a drive wheel is connected to the output shaft of the motor. One end of the rotating shaft is connected to a driven wheel, and the driven wheel and the drive wheel are rotatably connected via a belt.

7. A sieving mechanism of a sodium antimonate preparation apparatus, comprising a frame, characterized in that, The sieving mechanism of the sodium antimonate preparation apparatus further includes bearings, a rotating shaft, connecting rods, a screen, a motor, a drive wheel, a driven wheel, a belt, an opening, mounting plates, hinges, locking fasteners, and a cover. The rotating shaft is rotatably connected to both ends of the frame via a pair of bearings. A pair of mounting plates are fixedly connected to the rotating shaft, and the edges of the pair of mounting plates are fixedly connected via several connecting rods. The opening is connected to an adjacent pair of connecting rods. One side of the opening is rotatably connected to the edge of the cover via a hinge, and the other side of the opening is connected to the other edge of the cover via a locking fastener. The screen is fixedly connected to the outside of the pair of mounting plates and connecting rods. The motor is connected to the frame, and a drive wheel is connected to the output shaft of the motor. One end of the rotating shaft is connected to a driven wheel, and the driven wheel and the drive wheel are rotatably connected via a belt.

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