Crystallization equipment for sulfate treatment

Abstract

The utility model discloses crystallization equipment for sulfate treatment, which is characterized in that a crystallizer, a stirring mechanism, a heating device and a condensing device are combined, an aqueous solution mixed with a volatile solvent is used as a solvent of a saturated solution, and volatile gas is volatilized and vaporized under a low-pressure condition, so that the solvent content is reduced, and the system temperature is reduced; a crystallization system in which evaporation and cooling are carried out simultaneously is achieved, energy loss of solvent heating evaporation is reduced, volatile substances are condensed and recycled, residual water phases are further recycled, and solvent loss is reduced. The device has the beneficial effects that the solubility of sulfate is increased through solvent mixing, the volatile liquid is firstly heated and then evaporated, the energy loss is saved, the solvent is saved, the solvent amount is reduced when the volatile liquid volatilizes, the crystallization is accelerated, meanwhile, the solvent amount is reduced, so that solids in the solution are further crystallized and separated out, and the product quality is improved. Meanwhile, the volatile solvent is easy to recover, and the solvent is convenient to recover.

Description

Technical Field

[0001] The utility model relates to the technical field related to crystallization equipment, in particular to a crystallization equipment for sulfate treatment. Background Art

[0002] At present, the crystallization methods commonly used in sulfate treatment include cooling crystallization and evaporation crystallization. Although they have certain advantages in sulfate crystallization and have relatively mature processes, they also have some shortcomings.

[0003] Condensation crystallization is relatively simple and does not require heating equipment. It only needs to gradually lower the temperature of the solution. However, the cooling crystallization process usually takes a long time period because the growth rate of the crystal is relatively slow. This may extend the production cycle and affect production efficiency.

[0004] Evaporative crystallization can quickly concentrate the solution and promote the formation of crystals by heating and evaporating the solvent. The crystallization process and product properties can be adjusted by controlling the heating and evaporation rates. The disadvantages of evaporative crystallization are that heating equipment is required and energy is consumed to evaporate the solvent, which increases energy costs. The evaporated solvent is difficult to recover, and the solvent needs to be processed and recovered after evaporation, which may require additional steps and equipment. Utility Model Content

[0005] In view of the problems of slow crystallization speed of condensation crystallization, high energy loss of evaporation crystallization and difficulty in solvent recovery in the above-mentioned prior art, the present invention provides a crystallization device for sulfate treatment, which uses an aqueous solution mixed with a volatile solvent as the solvent of the saturated reagent, reduces the solvent content by volatilization and vaporization of volatile gases under low pressure conditions, reduces the system temperature, and achieves a crystallization system in which evaporation and cooling are performed simultaneously, thereby saving energy loss of heating and evaporation, condensing and recovering volatile substances, and discarding the mother liquor of the sulfate aqueous solution after crystallization due to its impurities. It can also be further mixed with a volatile solvent to configure a saturated solution for continuous recycling, thereby reducing the loss of solvent. The present invention adopts the following technical solutions:

[0006] A crystallization device for sulfate treatment comprises a crystallizer 1, wherein a sealing cover 2 is provided on the top of the crystallizer 1, a stirring mechanism 3 is provided on the sealing cover 2, a feed port 4 is provided on the sealing cover 2, an exhaust pipe 5 is provided on the sealing cover 2 on one side of the stirring mechanism 3, a vacuum pump 51 is provided on the exhaust pipe 5, the vacuum pump 51 is connected to a condensing device 52 by a pipeline, a recovery tank 53 is provided below the condensing device 52, a feed pipe 6 is provided on one side of the upper part of the crystallizer 1, a liquid outlet pipe 41 is provided on the other side of the upper part of the crystallizer 1, the liquid outlet pipe 41 is connected to the bottom of a heating device 42, the feed pipe 6 is connected to the inside of the crystallizer 1 and a batching tank 61, a conveying pipe 62 is provided on the batching tank 61, a conveying valve 63 is provided on the conveying pipe 62, and a pipe on the top of the heating device 42 is connected to the feed port 4.

[0007] Furthermore, a discharge pipe 11 is provided at the bottom of the crystallizer 1 , a discharge valve 12 is provided on the discharge pipe 11 , and the discharge pipe 11 is connected to a spiral discharge device 7 .

[0008] Furthermore, the spiral discharging device 7 includes a material receiving trough 71 , one side of the material receiving trough 71 is provided with a discharging cylinder 72 connected thereto, a spiral discharging rod 73 is provided in the discharging cylinder 72 , one end of the spiral discharging rod 73 is arranged in the material receiving trough 71 , and the spiral discharging rod 73 is connected to a rotating motor 74 .

[0009] Furthermore, the stirring mechanism 3 includes a stirring motor 31, a stirring rod 32, a screw rod 33, a support rod 34 and a stirring blade 35. The stirring motor 31 is connected to the stirring rod 32, the stirring rod 32 is provided with the screw rod 33, the support rod 34 is horizontally provided at the top end of the screw rod 33, and the stirring blade 35 is vertically provided on the support rod 34.

[0010] Furthermore, an electric pump 611 and a feed valve 612 are provided in sequence between the batching tank 61 and the feed pipe 6 .

[0011] Furthermore, the heating device 42 includes a heating tank 421, a heating bin 422, a steam inlet, a condensate outlet and a heating pipe 423. The heating bin 422 is provided in the heating tank 421. The upper and lower side surfaces of the heating tank 421 are respectively provided with a steam inlet and a condensate outlet. The heating bin 422 is provided with a heating pipe 423. The steam inlet and the condensate outlet are connected to the heating bin 422.

[0012] Furthermore, the condensation device 52 includes a condensation tank 521, a spiral condensation tube 522, a condensate outlet and a condensate inlet. The spiral condensation tube 522 is provided in the condensation tank 521, and the upper and lower end sides of the spiral condensation tube 522 are respectively provided with a condensate outlet and a condensate inlet.

[0013] Furthermore, a drain pipe 411 is provided on one side of the pipe between the liquid outlet pipe 41 and the heating device 42, a drain valve 412 is provided on the drain pipe 411, a circulating pump 413 is provided on the pipe between the liquid outlet pipe 41 and the heating device 42, a pressure pump 40 is provided on the feed port 4, and the pressure pump 40 is connected to the heating device 42.

[0014] The beneficial effects of the utility model are: 1. The solubility of sulfate is increased by solvent mixing, so that more sulfate is dissolved in a unit volume of solvent, thereby accelerating the sulfate treatment efficiency; 2. By heating the volatile liquid first and then evaporating it, the gas absorbs more heat when it evaporates, further reducing the temperature of the solution, which helps to accelerate crystallization. 3. When the volatile liquid evaporates, the amount of solvent is reduced. Reducing the amount of solvent allows the solid in the solution to further crystallize and precipitate, which helps to improve the crystallization efficiency. At the same time, the volatile solvent is easy to recover, which facilitates the recovery of the solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the heating device of the utility model;

[0017] Figure 3 It is a schematic diagram of the cooling device of the utility model;

[0018] Figure 4 This is a schematic diagram of the stirring structure of the utility model.

[0019] In the figure: 1-crystallizer, 11-discharge pipe, 12-discharge valve, 2-sealing cover, 3-stirring mechanism, 31-motor, 32-stirring rod, 33-screw rod, 34-support rod, 35-stirring blade, 4-feeding port, 40-pressure pump, 41-discharge pipe, 411-drain pipe, 412-drain valve, 413-circulation pump, 42-heating device, 421-heating tank, 422-heating bin, 423-heating pipe, 5-exhaust pipe, 521-condensation tank, 522-spiral condensation pipe, 51-vacuum pump, 52-condensation device, 53-recovery tank, 6-feeding pipe, 61-dosing tank, 611-electric pump, 612-feeding valve, 62-conveying pipe, 63-conveying valve, 7-screw discharging device, 71-receiving trough, 72-discharging barrel, 73-screw discharging rod, 74-rotating motor. DETAILED DESCRIPTION

[0020] 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.

[0021] Combination Figures 1 to 4 Shown:

[0022] A crystallization device for sulfate treatment includes a crystallizer 1, a sealing cover 2 is provided on the top of the crystallizer 1, a stirring mechanism 3 is provided on the sealing cover 2, a feed port 4 is provided on the sealing cover 2, an air extraction pipeline 5 is provided on the sealing cover 2 on one side of the stirring mechanism 3, a vacuum pump 51 is provided on the air extraction pipeline 5, the vacuum pump 51 is connected to a condensing device 52 by a pipeline, a recovery tank 53 is provided below the condensing device 52, a feed pipeline 6 is provided on one side of the upper part of the crystallizer 1, a liquid outlet pipeline 41 is provided on the other side of the upper part of the crystallizer 1, the liquid outlet pipeline 41 is connected to the bottom of a heating device 42, the feed pipeline 6 is connected to the inside of the crystallizer 1 and a batching tank 61, an electric pump 611 and a feed valve 612 are provided between the batching tank 61 and the feed pipeline 6 in sequence, a delivery pipeline 62 is provided on the batching tank 61, a delivery valve 63 is provided on the delivery pipeline 62, and a pipeline on the top of the heating device 42 is connected to the feed port 4.

[0023] A discharge pipe 11 is provided at the bottom of the crystallizer 1, and a discharge valve 12 is provided on the discharge pipe 11. The discharge pipe 11 is connected to a spiral discharge device 7, and the spiral discharge device 7 includes a receiving trough 71, and a discharge barrel 72 is provided on one side of the receiving trough 71. A spiral discharge rod 73 is provided in the discharge barrel 72, and one end of the spiral discharge rod 73 is arranged in the receiving trough 71. The spiral discharge rod 73 is connected to a rotating motor 74, and this mechanism is used to avoid discharge blockage.

[0024] The stirring mechanism 3 includes a stirring motor 31, a stirring rod 32, a screw rod 33, a support rod 34 and a stirring blade 35. The stirring motor 31 is connected to the stirring rod 32. The stirring rod 32 is provided with a screw rod 33. The top of the screw rod 33 is laterally provided with a support rod 34, and the support rod 34 is vertically provided with a stirring blade 35.

[0025] The heating device 42 includes a heating tank 421, a heating chamber 422, a steam inlet, a condensate outlet and a heating pipe 423. The heating chamber 422 is provided in the heating tank 421. The upper and lower sides of the heating tank 421 are respectively provided with a steam inlet and a condensate outlet. The heating chamber 422 is provided with a heating pipe 423. The steam inlet and the condensate outlet are connected to the heating chamber 422, so as to heat the saturated solution so that the mixed solution is easier to volatilize.

[0026] The condensation device 52 includes a condensation tank 521, a spiral condensation tube 522, a condensate outlet and a condensate inlet. The condensation tank 521 is provided with a spiral condensation tube 522. The upper and lower end sides of the spiral condensation tube 522 are respectively provided with a condensate outlet and a condensate inlet for recovering volatile gases.

[0027] A drain pipe 411 is provided on one side of the pipe between the liquid outlet pipe 41 and the heating device 42, a drain valve 412 is provided on the drain pipe 411, a circulating pump 413 is provided on the pipe between the liquid outlet pipe 41 and the heating device 42, a pressure pump 40 is provided on the feed port 4, and the pressure pump 40 is connected to the heating device 42 for liquid transportation.

[0028] Working principle: Some common volatile solvents are known and it is pointed out which sulfates may increase their solubility. For example, based on this principle, the utility model uses a mixed solution of volatile solvent and water to be transported to the batching pool, further transported to the crystallizer, transported to the heating device through the liquid outlet pipe for heating, and further transported to the crystallizer through the pressure pump. The vacuum pump is evacuated, and the volatile gas in the liquid evaporates and absorbs heat to condense the crystallizer. The vacuum pump extracts the volatile gas, which is condensed and recovered by the condensing device. The solvent and temperature in the crystallizer are greatly reduced, the crystallization efficiency is accelerated, and the energy consumption required for evaporation and crystallization heating is reduced. In order to obtain a higher crystallization rate, the mixed solution transported to the batching pool can be heated into a further concentrated superheated saturated liquid, and the heating device is further heated or kept warm. When returning to the crystallizer, it quickly evaporates and absorbs heat and condenses, reducing the solvent and cooling the crystallization at the same time. The volatile reagent used in the crystallization of the utility model is selected according to the type of sulfate, and the mixing ratio of the volatile solvent is adjusted according to the properties of the sulfate.

[0029] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A crystallization device for sulfate treatment, characterized in that: The invention comprises a crystallizer (1), wherein a sealing cover (2) is provided on the top of the crystallizer (1), a stirring mechanism (3) is provided on the sealing cover (2), a feed port (4) is provided on the sealing cover (2), an air extraction pipeline (5) is provided on the sealing cover (2) on one side of the stirring mechanism (3), a vacuum pump (51) is provided on the air extraction pipeline (5), a pipeline of the vacuum pump (51) is connected to a condensing device (52), a recovery tank (53) is provided below the condensing device (52), a feed pipeline (6) is provided on one side of the upper part of the crystallizer (1), a liquid outlet pipeline (41) is provided on the other side of the upper part of the crystallizer (1), the liquid outlet pipeline (41) is connected to the bottom of a heating device (42), the feed pipeline (6) is connected to the inside of the crystallizer (1) and a batching tank (61), a conveying pipeline (62) is provided on the batching tank (61), a conveying valve (63) is provided on the conveying pipeline (62), and a pipeline on the top of the heating device (42) is connected to the feed port (4).

2. A crystallization device for sulfate treatment according to claim 1, characterized in that: A discharge pipe (11) is provided at the bottom of the crystallizer (1), a discharge valve (12) is provided on the discharge pipe (11), and the discharge pipe (11) is connected to a spiral discharge device (7).

3. A crystallization device for sulfate treatment according to claim 2, characterized in that: The spiral discharging device (7) comprises a material receiving trough (71), one side of the material receiving trough (71) is provided with a material discharging cylinder (72) connected thereto, a spiral discharging rod (73) is provided inside the material discharging cylinder (72), one end of the spiral discharging rod (73) is arranged in the material receiving trough (71), and the spiral discharging rod (73) is connected to a rotating motor (74).

4. A crystallization device for sulfate treatment according to claim 1, characterized in that: The stirring mechanism (3) comprises a stirring motor (31), a stirring rod (32), a spiral rod (33), a support rod (34) and a stirring blade (35); the stirring motor (31) is connected to the stirring rod (32); the spiral rod (33) is provided on the stirring rod (32); the support rod (34) is transversely provided at the top end of the spiral rod (33); and the stirring blade (35) is vertically provided on the support rod (34).

5. A crystallization device for sulfate treatment according to claim 1, characterized in that: An electric pump (611) and a feed valve (612) are provided in sequence between the batching tank (61) and the feed pipeline (6).

6. A crystallization device for sulfate treatment according to claim 1, characterized in that: The heating device (42) comprises a heating tank (421), a heating bin (422), a steam inlet, a condensed water outlet and a heating pipe (423); the heating bin (422) is provided in the heating tank (421); the upper and lower side surfaces of the heating tank (421) are respectively provided with a steam inlet and a condensed water outlet; the heating bin (422) is provided with a heating pipe (423); the steam inlet and the condensed water outlet are connected to the heating bin (422).

7. A crystallization device for sulfate treatment according to claim 1, characterized in that: The condensing device (52) comprises a condensing tank (521), a spiral condensing tube (522), a condensate outlet and a condensate inlet. The spiral condensing tube (522) is arranged in the condensing tank (521), and the upper and lower ends of the spiral condensing tube (522) are respectively connected to the condensate outlet and the condensate inlet.

8. A crystallization device for sulfate treatment according to claim 1, characterized in that: A liquid discharge pipe (411) is provided on one side of the pipe between the liquid outlet pipe (41) and the heating device (42), a liquid discharge valve (412) is provided on the liquid discharge pipe (411), a circulating pump (413) is provided on the pipe between the liquid outlet pipe (41) and the heating device (42), a pressure pump (40) is provided on the feed port (4), and the pressure pump (40) is connected to the heating device (42).

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