Potassium sulfate crystallization and sedimentation device

Abstract

The utility model discloses a potassium sulfate crystallization settling device which comprises a communicated cooling crystal cultivating device, a turbulent flow mechanism is arranged in the cooling crystal cultivating device, the turbulent flow mechanism comprises a hollow cylinder fixed in the cooling crystal cultivating device, a spiral stirring mechanism is arranged in an inner cavity of the hollow cylinder, and the spiral stirring mechanism is arranged in the inner cavity of the hollow cylinder. The spiral stirring mechanism comprises a stirring shaft and a spiral stirring blade arranged on the stirring shaft, and the stirring shaft is connected with a stirring motor arranged at the top of the cooling crystal cultivation device; the lower part of the cooling crystal cultivating device is communicated with a liquid inlet of the cooling crystal cultivating device through a circulating pump, a circulating pipeline and a first condenser; a discharging opening in the bottom of the cooling crystal cultivating device is communicated with a feeding opening in the lower portion of the settling tank, and a first vertical partition plate and a second inclined partition plate are arranged in the settling tank from bottom to top. The device is high in crystallization efficiency and sedimentation efficiency, the production efficiency of potassium sulfate is greatly improved, gas escaped in the crystallization and sedimentation process is effectively absorbed and treated, and environmental protection is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of potassium sulfate production, in particular to a potassium sulfate crystallization sedimentation device. Background Art

[0002] Potassium sulfate is widely used in agriculture, industry and other fields, and plays an important role. At present, potassium sulfate production is mainly produced by reacting potassium chloride with dilute sulfuric acid to generate potassium sulfate. This step is usually carried out in a reactor, and the temperature and reaction time are controlled to ensure the full progress of the reaction. The obtained potassium sulfate solution is crystallized and separated to obtain potassium sulfate crystals. These crystals will be separated and dried to remove excess water, and finally the finished potassium sulfate will be obtained. There are the following problems in the above process; during the crystallization process of potassium sulfate solution, the accumulation of crystals settled at the bottom of the crystallizer will block the feed pipe, and the current crystallizer has poor crystallization efficiency, thereby affecting the yield of potassium sulfate. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a potassium sulfate crystallization and sedimentation device is provided, the crystallization efficiency and sedimentation efficiency of the device are high, the production efficiency of potassium sulfate is greatly improved, and the gas emitted during the crystallization and sedimentation process is effectively absorbed and treated, which is beneficial to environmental protection.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A potassium sulfate crystallization and sedimentation device comprises a connected cooling crystal cultivating vessel, wherein a spoiler mechanism is arranged in the cooling crystal cultivating vessel, wherein the spoiler mechanism comprises a hollow cylinder fixed in the cooling crystal cultivating vessel, wherein a spiral stirring mechanism is arranged in the inner cavity of the hollow cylinder, wherein the spiral stirring mechanism comprises a stirring shaft and a spiral stirring blade arranged on the stirring shaft, wherein the stirring shaft is connected to a stirring motor arranged on the top of the cooling crystal cultivating vessel; wherein the lower part of the cooling crystal cultivating vessel is connected to the liquid inlet of the cooling crystal cultivating vessel through a circulating pump, a circulating pipeline and a first condenser; wherein the discharge port at the bottom of the cooling crystal cultivating vessel is connected to the feed port at the lower part of a sedimentation tank, wherein a vertical partition plate 1 and an inclined partition plate 2 are arranged from bottom to top in the sedimentation tank respectively.

[0006] As an improved technical solution, the exhaust port of the cooling crystal growing device and the settling tank is connected to a spray tower via a second condenser.

[0007] As an improved technical solution, the liquid outlet of the second condenser is connected to the feed inlet of the cooling crystal growing device.

[0008] As an improved technical solution, the stirring shaft is also connected to a scraper which abuts against the inner wall of the cooling crystal growing device through a connecting rod.

[0009] As an improved technical solution, a cooling buffer cavity is provided on the side wall of the hollow cylinder, and the liquid inlet and liquid outlet of the cooling buffer cavity are respectively connected to the overflow port at the top of the sedimentation tank and the feed port at the bottom.

[0010] As an improved technical solution, a plurality of turbulent holes are further provided on the spiral stirring blade.

[0011] As an improved technical solution, a jacket is provided on the outer side of the cooling crystal growing device, and a heat exchange medium inlet and a heat exchange medium outlet are provided on the jacket.

[0012] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0013] The device is provided with a turbulent mechanism in the cooling crystal growing device; during crystallization, under the action of the hollow cylinder and the spiral stirring mechanism, the crystallization liquid circulates inside and outside the hollow cylinder, thereby improving the contact efficiency between the crystal and the liquid, and thus improving the crystallization efficiency.

[0014] The device is also provided with a scraper on the spiral stirring mechanism, which is against the inner wall of the cooling crystal growing device. The crystals adhering to the inner wall of the cooling crystal growing device can be scraped off in time by the rotation of the scraper. The scraped crystals enter the feed liquid and can be used as crystal seeds, further improving the crystallization efficiency.

[0015] The lower part of the cooling crystal accumulator of this device is connected to the liquid inlet of the cooling crystal accumulator through a circulation pump, a circulation pipeline, and a first condenser; the circulation pump promptly extracts the crystal-containing liquid deposited at the bottom of the cooling crystal accumulator and pumps it back into the cooling crystal accumulator for crystallization treatment, thereby improving crystallization efficiency.

[0016] A vertical partition plate 1 and an inclined partition plate 2 are respectively arranged from bottom to top in the sedimentation tank of the device. During the rising process of the crystallization liquid, the vertical partition plate and the inclined partition plate can respectively change the flow state of the solution, thereby improving the sedimentation efficiency.

[0017] The cooling crystal growing device of the device and the exhaust port of the settling tank are connected to the spray tower through the second condenser; the liquid outlet of the second condenser is connected to the feed port of the cooling crystal growing device. The liquid entrained in the gas can be separated by condensation of the second condenser, and the spray tower can effectively absorb harmful gases, which is beneficial to environmental protection.

[0018] A cooling buffer cavity is provided on the side wall of the hollow cylinder of the device, and the liquid inlet and liquid outlet of the cooling buffer cavity are respectively connected to the overflow port at the top of the settling tank and the feed port at the bottom. The supernatant after settling flows out from the overflow port into the cooling buffer cavity of the hollow cylinder and can exchange heat with the feed liquid in the cooling crystal growing device. The feed liquid after heat exchange enters the settling tank for further settling treatment, thereby improving the yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0021] Figure 2 It is a schematic diagram of the internal structure of a hollow cylinder;

[0022] In the figure, 1. cooling crystal growing device; 2. heat exchange medium inlet; 3. heat exchange medium outlet; 4. hollow cylinder; 5. stirring shaft; 6. spiral stirring blade; 7. stirring motor; 8. turbulent hole; 9. circulation pump; 10. circulation pipeline; 11. first condenser; 12. sedimentation tank; 13. vertical partition one; 14. inclined partition two; 15. second condenser; 16. spray tower; 17. connecting rod; 18. scraper; 19. cooling buffer chamber. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0026] Example 1

[0027] like Figure 1 and Figure 2As shown, a potassium sulfate crystallization and sedimentation device comprises a connected cooling crystal-cultivating vessel 1, the outer side of the cooling crystal-cultivating vessel 1 is provided with a jacket (not shown in the figure), and the jacket is provided with a heat exchange medium inlet 2 and a heat exchange medium outlet 3; the cooling crystal-cultivating vessel 1 is provided with a spoiler mechanism, the spoiler mechanism comprises a hollow cylinder 4 fixed in the cooling crystal-cultivating vessel 1, the inner cavity of the hollow cylinder 4 is provided with a spiral stirring mechanism, the spiral stirring mechanism comprises a stirring shaft 5 and a spiral stirring blade 6 arranged on the stirring shaft 5, the stirring shaft 5 is connected to a stirring motor 7 arranged on the top of the cooling crystal-cultivating vessel 1; a plurality of spoiler holes 8 are also provided on the spiral stirring blade 6; the lower part of the cooling crystal-cultivating vessel 1 is connected with the liquid inlet of the cooling crystal-cultivating vessel 1 through a circulating pump 9, a circulating pipeline 10, and a first condenser 11; the bottom discharge port of the cooling crystal-cultivating vessel 1 is connected to the feed port at the lower part of the sedimentation tank 12, and the sedimentation tank 12 is provided with a vertical partition 13 and an inclined partition 2 14 from bottom to top.

[0028] Through the above technical solution, the potassium sulfate solution enters the cooling crystal accumulator 1 and crystallizes under cooling conditions. During the crystallization process, the feed liquid forms a cycle inside and outside the hollow cylinder 4 under the action of the spiral stirring mechanism, thereby improving the crystallization efficiency. Under the action of the circulating pump 9, the crystal solution settled at the bottom of the cooling crystal accumulator 1 enters the cooling crystal accumulator 1 again through the cooling of the circulation pipeline 10 and the first condenser 11 for cooling crystallization treatment, thereby improving the cooling crystallization efficiency. The crystallized feed liquid enters the settling tank 12 and is subjected to a settling treatment under the action of the vertical partition 1 13 and the inclined partition 2 14.

[0029] Further, in this embodiment, if Figure 1 As shown, the exhaust ports of the cooling crystal-growing device 1 and the settling tank 12 are connected to the spray tower 16 through the second condenser 15; the liquid outlet of the second condenser 15 is connected to the feed port of the cooling crystal-growing device 1. The gas carried by the liquid during the cooling and settling process is separated and condensed by the second condenser 15 before entering the spray tower 16 for absorption treatment to prevent the gas from escaping directly into the atmosphere and polluting the environment.

[0030] Further, in this embodiment, if Figure 1 As shown, the stirring shaft 5 is also connected to a scraper 18 against the inner wall of the cooling crystal-growing device 1 through a connecting rod 17. Driven by the spiral stirring mechanism, the scraper 18 also rotates, thereby scraping off the crystals adhering to the inner wall of the cooling crystal-growing device 1 to avoid the occurrence of crystal wall hanging on the inner wall of the cooling crystal-growing device 1.

[0031] Further, in this embodiment, if Figure 1 and Figure 2As shown, a cooling buffer cavity 19 is provided on the side wall of the hollow cylinder 4, and the liquid inlet and liquid outlet of the cooling buffer cavity 19 are respectively connected to the overflow port at the top of the settling tank 12 and the feed port at the bottom. Through the above arrangement, the supernatant after the settling tank 12 can enter the cooling buffer cavity 19 of the hollow cylinder 4 as a heat exchange medium to exchange heat with the feed liquid in the cooling crystal growing device 1, and the feed liquid after heat exchange re-enters the settling tank 12 for sedimentation, thereby improving the product yield.

[0032] In addition, it should be understood that after reading the contents taught in the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A potassium sulfate crystallization and sedimentation device, characterized in that: It includes a connected cooling crystal cultivating vessel, wherein a spoiler mechanism is provided in the cooling crystal cultivating vessel, wherein the spoiler mechanism includes a hollow cylinder fixed in the cooling crystal cultivating vessel, wherein a spiral stirring mechanism is provided in the inner cavity of the hollow cylinder, wherein the spiral stirring mechanism includes a stirring shaft and a spiral stirring blade arranged on the stirring shaft, wherein the stirring shaft is connected to a stirring motor arranged on the top of the cooling crystal cultivating vessel; the lower part of the cooling crystal cultivating vessel is connected to the liquid inlet of the cooling crystal cultivating vessel through a circulating pump, a circulating pipeline and a first condenser; the discharge port at the bottom of the cooling crystal cultivating vessel is connected to the feed port at the lower part of a settling tank, wherein a vertical partition plate 1 and an inclined partition plate 2 are respectively provided from bottom to top in the settling tank.

2. A potassium sulfate crystallization sedimentation device according to claim 1, characterized in that: The exhaust port of the cooling crystal-growing device and the settling tank is connected to the spray tower through the second condenser.

3. A potassium sulfate crystallization and settling device according to claim 2, characterized in that: The liquid outlet of the second condenser is connected to the feed inlet of the cooling crystal growing device.

4. A potassium sulfate crystallization and sedimentation device according to claim 1, characterized in that: The stirring shaft is also connected to a scraper which abuts against the inner wall of the cooling crystal growing device through a connecting rod.

5. A potassium sulfate crystallization and sedimentation device according to claim 1, characterized in that: A cooling buffer cavity is provided on the side wall of the hollow cylinder, and a liquid inlet and a liquid outlet of the cooling buffer cavity are respectively connected to an overflow port at the top of the sedimentation tank and a feed port at the bottom.

6. A potassium sulfate crystallization and sedimentation device according to claim 1, characterized in that: The spiral stirring blade is also provided with a plurality of flow disturbance holes.

7. A potassium sulfate crystallization and sedimentation device according to claim 1, characterized in that: A jacket is arranged on the outside of the cooling crystal growing device, and a heat exchange medium inlet and a heat exchange medium outlet are arranged on the jacket.

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