Crystallization tower device for preparing borax from salt lake brine

Abstract

The utility model discloses a crystallization tower device for preparing borax from salt lake brine. The crystallization tower device comprises a vacuum crystallization tower, a mixing condenser, a hot steam pipeline, a circulating water pipeline, a forced circulating pump, a vacuum pump and a vacuum pipeline, a top cover of the vacuum crystallization tower is connected with the hot steam pipeline, the hot steam pipeline is connected with the mixing condenser, the circulating water pipeline is connected with the mixing condenser, the vacuum pump is connected with the top of the mixing condenser through the vacuum pipeline, and the vacuum meter, the manhole and the sight glass are installed on the outer wall of the vacuum crystallization tower. A feed port, a material circulating pipeline and a discharge port are arranged at the bottom of the vacuum crystallization tower, the mixing condenser is provided with a circulating water inlet pipeline, a circulating water regulating valve and a circulating water outlet pipeline, and the vacuum pump and the mixing condenser are connected to form a condensation system; the device disclosed by the utility model is high in treatment capacity, can continuously work, and can quickly cool a borax solution, so that a large amount of borax solids can be quickly separated out.

Description

Technical Field

[0001] The utility model belongs to the technical field of crystallization towers, and in particular relates to a crystallization tower device for preparing borax from salt lake brine. Background Art

[0002] The crystallization tower is one of the devices that realizes the transformation from liquid phase to solid phase. It is widely used in the production of various types of chemical products. The vacuum crystallization tower is based on the principle of solubility difference at different temperatures. The solid is precipitated by lowering the temperature to obtain the product. In the process of preparing borax using salt lake brine, the solubility of borax varies greatly depending on the temperature. If the temperature is not lowered in time, the solution temperature is too high and the crystallization is not obvious, resulting in a low yield, which greatly affects the borax production. Utility Model Content

[0003] The utility model aims to provide a crystallization tower device for preparing borax from salt lake brine, so as to solve the problem of low yield caused by untimely temperature reduction and little crystallization in the process of preparing borax from salt lake brine.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a crystallization tower device for preparing borax from salt lake brine, the crystallization tower device comprising a vacuum crystallization tower, a mixing condenser, a hot steam pipeline, a circulating water pipeline, a forced circulation pump, a vacuum pump, and a vacuum pipeline. The top cover of the vacuum crystallization tower is connected to the hot steam pipeline, the hot steam pipeline is connected to the mixing condenser, the circulating water pipeline is connected to the mixing condenser, the vacuum pump is connected to the top of the mixing condenser through the vacuum pipeline, a vacuum gauge, a manhole, and a sight glass are installed on the outer wall of the vacuum crystallization tower, a feed inlet, a material circulation pipeline, and a discharge port are arranged at the bottom of the vacuum crystallization tower, the mixing condenser is provided with a circulating water inlet pipeline, a circulating water regulating valve, and a circulating water outlet pipeline, and the vacuum pump is connected to the mixing condenser to form a condensation system.

[0005] Furthermore, reinforcing ribs are arranged on the outer wall of the vacuum crystallization tower to strengthen the strength of the crystallization tower shell. An eccentric feed reducer, a central tube, a bell mouth, and a conical tube are arranged inside the vacuum crystallization tower. The borax solution enters the central tube through the reducer and the bell mouth and then overflows.

[0006] Furthermore, an emptying pipeline is installed in the circulation pipeline at the bottom of the vacuum crystallization tower to realize material emptying, and the inner wall of the vacuum crystallization tower is lined with titanium plates to enhance corrosion resistance.

[0007] Furthermore, two sections of liquid redistributors are arranged inside the mixing condenser, and the inlet of the hot gas pipeline is below the circulating water inlet.

[0008] Furthermore, the forced circulation pump and the vacuum pump are both installed grounded, and the circulating water pipeline is connected to the circulating water tank, so that continuous vacuuming is achieved through the combined action of the circulating water and the vacuum pump.

[0009] Furthermore, the feed inlet is arranged below the vacuum crystallization tower and connected to a circulation pipeline, so that the circulating materials enter the interior of the vacuum crystallization tower together.

[0010] Compared with the prior art, the borax crystallization tower device provided by the utility model has the following gain effects:

[0011] 1. The utility model provides a crystallization tower device for preparing borax from salt lake brine. The borax solution enters the vacuum crystallization tower and overflows through the bell mouth. Under the joint action of forced material circulation, circulating water and vacuum pump, the borax solution can be quickly cooled, thereby rapidly precipitating a large amount of borax solids.

[0012] 2. The utility model can increase the circulating water flow, vacuum degree and forced circulation flow of materials, thereby greatly improving the processing capacity of the device and achieving the same inlet and outlet flow under the condition that the temperature meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of the crystallization tower device of the utility model;

[0014] Figure 2 This is another partial cross-sectional structural schematic diagram of the crystallization tower device of the utility model.

[0015] Reference numerals

[0016] Among them: 1. Vacuum crystallization tower; 2. Mixing condenser; 3. Hot steam pipeline; 4. Vacuum crystallization tower cover; 5. Manhole; 6. Sight glass; 7. Feed inlet; 8. Material circulation pipeline; 9. Forced circulation pump; 10. Discharge port; 11. Vacuum pump; 12. Vacuum pipeline; 13 Circulating water inlet pipeline; 14. Circulating water inlet valve; 15. Circulating water outlet pipeline; 16. Reinforcement ribs; 17. Eccentric reducer; 18. Center tube; 19. Bell mouth; 20. Conical barrel; 21. Drain pipeline. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] The schematic diagram of the crystallization tower device for preparing borax from salt lake brine provided by the utility model is as follows Figure 1 and Figure 2 shown.

[0019] The utility model provides a technical solution: the crystallization tower device comprises a vacuum crystallization tower 1, a mixing condenser 2, a hot steam pipeline 3, a forced circulation pump 9, a vacuum pump 11, a vacuum pipeline 12, and circulating water pipelines 13 and 14; the vacuum crystallization tower cover 4 is connected to the hot steam pipeline 3, the hot steam pipeline 3 is connected to the mixing condenser 2, the circulating water inlet pipeline 13 is connected to the mixing condenser 2, the vacuum pump 11 is connected to the top of the mixing condenser 2 through the vacuum pipeline 12, and the vacuum pump 11 is connected to the mixing condenser 2 to form a condensation system.

[0020] The outer wall of the vacuum crystallization tower 1 is installed with a vacuum gauge, a manhole 5, and a sight glass 6, which are convenient for checking the vacuum degree, material liquid level height and internal maintenance. The bottom of the vacuum crystallization tower is provided with a feed port 7, a material circulation pipeline 8, a forced circulation pump 9, and a discharge port 10. The feed port 7 is installed below the vacuum crystallizer 1 to bypass and form a circulation system with the material circulation pipeline 8. The borax solution enters the vacuum crystallization tower 1 together with the circulating material for cooling. An emptying pipeline 21 is installed below the material circulation pipeline 8 at the bottom of the vacuum crystallization tower 1 to realize the emptying of internal materials. The forced circulation pump 9 is grounded and forced to circulate the borax solution in the material circulation pipeline 8 from bottom to top. The discharge port 10 is arranged directly below the vacuum crystallization tower 1 to realize feeding and discharging at the same time.

[0021] The vacuum pump 11 is installed grounded, and is connected to the top of the mixing condenser 2 through a vacuum pipeline 12. The vacuum pump 11 can generate a maximum vacuum degree of 0.08MPa. The mixing condenser 2 is provided with a circulating water inlet pipeline 13, a circulating water regulating valve 14, and a circulating water outlet pipeline 15. The circulating water inlet pipeline 13 is a two-section water inlet, and the circulating water outlet pipeline 15 is a one-section water outlet. The circulating water pipelines 13 and 15 are respectively connected to a circulating water tank and then to a cooling water tower to achieve recycling after cooling. Two sections of liquid redistributors are installed inside the mixing condenser 2, and the inlet of the hot steam pipeline 3 is below the circulating water feed port, so that the circulating water can flow downstream. The vacuum pump 11 and the mixing condenser 2 together constitute the condensation system of the crystallization tower device.

[0022] The outer wall of the vacuum crystallization tower 1 is provided with reinforcing ribs 16 to strengthen the strength and loading capacity of the crystallization tower shell. The inner wall of the vacuum crystallization tower 1 is provided with a full inner lining titanium plate to enhance the corrosion resistance. The inside of the vacuum crystallization tower 1 is provided with an eccentric reducer 17 for feeding, a central tube 18 and an internal overflow bell mouth 19 connected thereto. The lower half of the interior of the vacuum crystallization tower 1 is provided with a conical barrel 20 connected to the discharge port 10. The flow rate of the borax mother liquor is reduced after passing through the eccentric reducer 17, and then passes through the central tube 18 and the bell mouth 19 to form a slow overflow from top to bottom.

[0023] The utility model is based on the principle that the solubility of materials at different temperatures is different, and borax is obtained by cooling and crystallizing according to the solubility curve. The circulating water inlet pipe 13, the circulating water outlet pipe 14 and the vacuum pump 11 of the mixing condenser 2 constitute a condensation system. The specific principle is that the circulating water enters from the circulating water inlet pipe 13, forms a pressure difference downstream, and forms a negative pressure inside the vacuum crystallization tower 1 connected to the hot steam pipe 3. The hot steam continuously enters the mixing condenser, and the circulating water is heated and recycled after cooling in the cooling tower. The pressure difference formed by the water downstream in the mixing condenser 2 has a certain pressure difference limit according to the design of the device. If faster cooling is required, the vacuum pump 11 can be turned on. Under the connection effect of the vacuum pipe 12, a higher negative pressure is formed on the top of the mixing condenser 2, which further increases the vacuum degree inside the vacuum crystallization tower 1, and can take away heat more quickly. The amount of vacuum can be achieved by the combined action of the mixing condenser 2 and the vacuum pump 11, and a vacuum degree of 0.04-0.06MPa can be achieved inside the vacuum crystallization tower. The circulation system and internal structure of the vacuum crystallization tower 1 are also composed of a cooling crystallization core. The borax solution overflows from the bell mouth 19 together with the borax solution feed through forced circulation. The slow overflow of the bell mouth 19 from top to bottom and the design of the circulation device can fully bring out the heat of the material. The circulation system of the vacuum crystallization tower 1 is discharged at the top and fed at the bottom. The temperature of the borax mother liquor that has been taken away with heat is quickly reduced to precipitate borax, which is discharged through the discharge port 10.

[0024] The above embodiments are only specific descriptions of the present invention and cannot be used to limit the scope of protection. Therefore, reasonable modifications, adjustments and improvements of the present invention by those skilled in the art all fall within the scope of protection of the present invention.

Claims

1. A crystallization tower device for preparing borax from salt lake brine, characterized in that: The crystallization tower device comprises a vacuum crystallization tower, a mixing condenser, a hot steam pipeline, a circulating water pipeline, a forced circulation pump, a vacuum pump, and a vacuum pipeline. The top cover of the vacuum crystallization tower is connected to the hot steam pipeline, the hot steam pipeline is connected to the mixing condenser, the circulating water pipeline is connected to the mixing condenser, the vacuum pump is connected to the top of the mixing condenser through the vacuum pipeline, a vacuum gauge, a manhole, and a sight glass are installed on the outer wall of the vacuum crystallization tower, a feed port, a material circulation pipeline, and a discharge port are arranged at the bottom of the vacuum crystallization tower, the mixing condenser is provided with a circulating water inlet pipeline, a circulating water regulating valve, and a circulating water outlet pipeline, and the vacuum pump is connected to the mixing condenser to form a condensation system.

2. A crystallization tower device for preparing borax from salt lake brine according to claim 1, characterized in that: The outer wall of the vacuum crystallization tower is provided with reinforcing ribs, and the interior of the vacuum crystallization tower is provided with a feed eccentric reducer, a central tube, a bell mouth, and a conical tube. The borax solution enters the central tube through the reducer and the bell mouth and then overflows.

3. A crystallization tower device for preparing borax from salt lake brine according to claim 1, characterized in that: The circulation pipeline at the bottom of the vacuum crystallization tower is equipped with an emptying pipeline, and the inner wall of the vacuum crystallization tower is lined with titanium plates.

4. The crystallization tower device for preparing borax from salt lake brine according to claim 1, characterized in that: Two sections of liquid redistributors are arranged inside the mixing condenser, and the inlet of the hot gas pipeline is below the circulating water inlet.

5. The crystallization tower device for preparing borax from salt lake brine according to claim 1, characterized in that: The forced circulation pump and the vacuum pump are both grounded and installed, and the circulating water pipeline is connected to the circulating water tank. The circulating water and the vacuum pump work together to achieve continuous vacuuming.

6. The crystallization tower device for preparing borax from salt lake brine according to claim 1, characterized in that: The feed inlet is arranged below the vacuum crystallization tower and is connected to the circulation pipeline, so that the circulating materials enter the vacuum crystallization tower together.

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