CN216687516U - Device system for producing potassium sulfate - Google Patents
Device system for producing potassium sulfate Download PDFInfo
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- CN216687516U CN216687516U CN202220427885.3U CN202220427885U CN216687516U CN 216687516 U CN216687516 U CN 216687516U CN 202220427885 U CN202220427885 U CN 202220427885U CN 216687516 U CN216687516 U CN 216687516U
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Abstract
The utility model discloses a device system for producing potassium sulfate, which comprises a salting-out device, a sodium chloride separation and washing device, a first-section conversion device, a second-section conversion device, a potassium sulfate separation and washing device and a cooling device, wherein the salting-out device is connected with the sodium chloride separation and washing device; the salting-out device comprises a salting-out kettle and a salting-out buffer kettle, the sodium chloride separation and washing device comprises a filter A, a centrifuge A, a high-potassium mother liquid tank and a salt washing liquid tank, one section of conversion device comprises a reaction kettle, a filter B and a sodium mother liquid tank, the two section of conversion device comprises a two section conversion kettle, the potassium sulfate separation and washing device comprises a filter C, a centrifuge B and a potassium mother liquid tank, and the cooling device comprises a cooler, a cooling kettle, a freezing kettle, a cooling system, a filter D and a sodium mother liquid tank. The device system of the utility model has simple process for producing potassium sulfate, can greatly improve the resource utilization efficiency and the potassium yield by circularly batching, and can fully utilize the prior mirabilite resource advantages in China.
Description
Technical Field
The utility model relates to the technical field of chemical production, in particular to a device system for producing potassium sulfate.
Background
The potassium sulfate is an important chlorine-free potassium fertilizer, and the agricultural demand is very vigorous. In the process of preparing potassium sulfate by mirabilite method, mirabilite and potassium chloride are usually directly used for twice conversion to produce potassium sulfate, but the existing products have high content of water-insoluble substances (containing insoluble sulfate), large treatment capacity of mother liquor and high evaporation rate of 2.3m for producing 1 ton of products3The energy consumption is very high, and the production efficiency is very low because of the huge equipment. And the mother liquor is flash evaporated for the second time and cooled to separate out sodium chloride and mirabilite mixed salt, and the mother liquor can be subjected to second-stage conversion after physical treatment. The other process is that a section of conversion mother liquor is evaporated at high temperature to separate out sodium chloride, cooled and cooled to separate out glaserite, and the cooled mother liquor is recycled to recycle part of potassium in a high-temperature evaporation-cooling mode, but with continuous circulation of the mother liquor, the amount of the mother liquor is continuously accumulated to cause expansion of the mother liquor of the system, increase the operation pressure of equipment, and discharge of redundant mother liquor to greatly reduce the yield of potassium; if the first section of conversion mother liquor is completely evaporated, the evaporation capacity is large, the energy consumption is high, the separated potassium-containing mixed salt is complex, and the separation difficulty is increased; if the sodium chloride in the first-stage conversion mother liquor is evaporated and separated, the sodium chloride is completely returned to the first-stage converter for recycling, the material amount of the first-stage conversion is increased, the capacity of equipment is low, the production efficiency is low, meanwhile, a large amount of circulating mother liquor continuously runs between devices, the energy consumption is increased, and the equipment investment and the running cost are increased.
For example, CN1189456A discloses a process for producing potassium sulfate, which comprises subjecting glaserite mother liquor obtained by first stage conversion and separation to primary high temperature evaporation to separate sodium chloride, then subjecting to negative pressure evaporation to obtain supersaturated solution of salt mother liquor, and then participating in first stage double decomposition reaction. However, the process has the defects of limited evaporation degree, low sodium chloride yield, large amount of returned mother liquor, high system operation cost, low capacity and the like, and generates higher production pressure for a first-stage conversion reactor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a device system for producing potassium sulfate, which has high production efficiency and low energy consumption.
In order to achieve the aim, the utility model provides a device system for producing potassium sulfate, which comprises a salting-out device, a sodium chloride separating and washing device, a first-stage conversion device, a second-stage conversion device, a potassium sulfate separating and washing device and a cooling device, wherein the salting-out device is connected with the sodium chloride separating and washing device; the salting-out device comprises a salting-out kettle and a salting-out buffer kettle communicated with the salting-out kettle; the sodium chloride separation and washing device comprises a filter A, a centrifuge A, a high-potassium mother liquor tank and a salt washing liquor tank, wherein a liquid outlet of the salting-out buffer kettle is connected with the filter A through a connecting pipe, and a liquid phase outlet of the filter A is respectively connected with the high-potassium mother liquor tank and the salt washing liquor tank; the first-stage conversion device comprises a reaction kettle, a filter B and a sodium mother liquor tank, a discharge port of the reaction kettle is connected with the filter B through a connecting pipe, and a liquid phase outlet of the filter B is connected with the sodium mother liquor tank; the second-stage conversion device comprises a second-stage conversion kettle connected with the solid phase outlet of the filter B, and the second-stage conversion kettle is connected with the high-potassium mother liquid tank; the potassium sulfate separating and washing device comprises a filter C, a centrifuge B and a potassium mother liquor tank, wherein a liquid outlet of the sodium mother liquor tank is connected with the filter C through a connecting pipe, a liquid phase outlet of the filter C is connected with the potassium mother liquor tank, a solid phase outlet of the filter C is connected with the centrifuge B, a liquid storage port of the centrifuge B is connected with the potassium mother liquor tank, and a liquid storage port of the potassium mother liquor tank is connected with the reaction kettle; the cooling device comprises a cooler, a cooling kettle, a freezing kettle, a cooling system, a filter D and a sodium mother liquid pool, wherein the cooler is connected with the freezing kettle in sequence, a liquid outlet of the sodium mother liquid pool is communicated with a connecting pipe between the cooler and the cooling kettle, the cooling system is connected with the freezing kettle, a discharge port of the freezing kettle is connected with the filter D, a liquid phase outlet of the filter D is connected with the sodium mother liquid pool, a solid phase outlet of the filter D is connected with two conversion kettles, and a liquid outlet of the sodium mother liquid pool is connected with an inlet of the cooler.
Furthermore, a reaction buffer kettle is further arranged between the reaction kettle and the filter B, a discharge port of the reaction kettle is connected with a feed port of the reaction buffer kettle, and a discharge port of the reaction buffer kettle is connected with the filter B.
Furthermore, the salting-out kettle, the reaction kettle and the reaction buffer kettle respectively comprise a dissolving area and a crystallization area, the dissolving area and the crystallization area are arranged on the upper portion and the lower portion, the dissolving area and the crystallization area in each kettle are communicated with each other from top to bottom, a feed inlet in each kettle is communicated with the dissolving area, and a discharge outlet is communicated with the crystallization area.
Further, the salting-out kettle and the feed inlet top of the reaction kettle are both provided with a hopper and a weighing electronic belt scale, the outlet of the hopper is connected with the weighing electronic belt scale, and the tail end of the weighing electronic belt scale is located above the feed inlet of the corresponding kettle.
Furthermore, the sodium chloride separating and washing device and the potassium sulfate separating and washing device both comprise belt conveyors for receiving solid materials output by the centrifugal machine.
Further, the filter A, the filter B, the filter C and the filter D are all vacuum belt filters.
Furthermore, the sodium mother liquor tank is respectively connected with a circulating water feeding pipeline and a circulating water drainage system.
Further, the cooling device also comprises a freezing buffer kettle positioned between the freezing kettle and the filter D.
Further, cooling system includes compressor unit, evaporative condenser, barrel pump unit and siphon jar, compressor unit with evaporative condenser and the siphon jar is connected respectively, the barrel pump unit with the siphon jar respectively with freezing cauldron is connected.
Further, the salting-out buffer kettle is communicated with a steam main pipe.
Compared with the prior art, the utility model has the following beneficial effects:
(1) according to the device system, the first-stage conversion device and the second-stage conversion device are arranged, the first-stage conversion and the second-stage conversion are carried out by reacting salt-separating high-potassium mother liquor (the main component is potassium nitrate without water insoluble substances) subjected to belt filtration with mirabilite (or glaserite) to prepare the potassium sulfate, the potassium sulfate product does not contain water insoluble substances, and the content of potassium oxide in the potassium sulfate can reach 51.4%, so that the device system meets the first-class standard in GB/T20406-2017 potassium sulfate for agriculture. The potassium sulfate product produced by the device system of the utility model has good quality (the potassium sulfate is fully water-soluble), the mother liquor has small circulation amount, large capacity, high production efficiency, small evaporation amount and low energy consumption; the sodium chloride produced has low potassium oxide and sulfate radical content, high material recovering rate and low cost.
(2) The device system has low investment and production cost, the process for producing the potassium sulfate is simple, the resource utilization efficiency and the potassium yield can be greatly improved by circularly proportioning, and the advantages of the existing mirabilite resources in China can be fully utilized.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic diagram of the construction of an apparatus system for the production of potassium sulfate according to the present invention;
wherein, 1-salting out kettle, 2-salting out buffer kettle, 3-filter A, 4-centrifuge A, 5-high potassium mother liquor tank, 6-salt washing liquor tank, 7-reaction kettle, 8-filter B, 9-sodium mother liquor tank, 10-two-stage conversion kettle, 11-filter C, 12-centrifuge B, 13-potassium mother liquor tank, 14-cooler, 15-cooling kettle, 16-freezing kettle, 17-filter D, 18-sodium mother liquor tank, 19-reaction buffer kettle, 20-weighing electronic belt scale, 21-belt conveyer, 22-freezing buffer kettle, 23-potassium chloride hopper, 24-sodium sulfate hopper.
Detailed Description
Embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 1, the present embodiment provides an apparatus system for producing potassium sulfate, which includes a salting-out device, a sodium chloride separating and washing device, a first-stage conversion device, a second-stage conversion device, a potassium sulfate separating and washing device, and a cooling device; the concrete structure is as follows:
the device of salting out includes 1 and the buffer tank 2 of salting out of cauldron, the cauldron of salting out is including setting up dissolving the district and setting up the crystallization district under on, dissolve district and crystallization district intercommunication in the cauldron of salting out, top in the cauldron of salting out is equipped with the feed inlet with dissolving the district intercommunication, the bottom is equipped with the discharge gate with the crystallization district intercommunication, the top of feed inlet is equipped with potassium chloride hopper 23 and electronic belt weigher 20 of weighing, the export and the electronic belt weigher of weighing of potassium chloride hopper are connected, the end of the electronic belt weigher of weighing is located the feed inlet top department of the cauldron of salting out. The top of the salting-out kettle is provided with a stirring device, and a stirring paddle of the stirring device is arranged in a dissolving area of the salting-out kettle. The outside of the salting-out kettle is also provided with a circulating pipeline and a circulating pump, a liquid inlet of the circulating pipeline is communicated with a dissolving area of the salting-out kettle, a liquid outlet of the circulating pipeline is communicated with a crystallization area of the salting-out kettle, and the circulating pump is arranged on the circulating pipeline. The discharge port in the salting-out kettle is connected with the salting-out buffer kettle through a connecting pipe, and the salting-out buffer kettle is communicated with the steam main pipe. The sodium chloride separating and washing device comprises a filter A3, a centrifuge A4, a high potassium mother liquor tank 5 and a salt washing tank 6, wherein a liquid outlet of the salting-out buffer kettle is connected with the filter A through a connecting pipe. Discharging pumps are arranged on a connecting pipe between the salting-out kettle and the salting-out buffer kettle and a connecting pipe between the salting-out buffer kettle and the filter A. A hot water spray pipe is arranged above the filter A, a first liquid phase outlet (a liquid phase outlet at one end of the filter A connected with the salting-out buffer kettle-a high potassium mother liquid outlet) of the filter A is connected with the high potassium mother liquid tank, and a second liquid phase outlet (a liquid phase outlet at one end of the filter A away from the salting-out buffer kettle-a salt washing liquid outlet) of the filter A is connected with the salt washing liquid tank.
In the preferred embodiment of the utility model, the first stage of conversion device comprises a reaction kettle 7, a reaction buffer kettle 19, a filter B8 and a sodium mother liquid tank 9, the structures of the reaction kettle and the reaction buffer kettle are approximately the same as the structure of the salting kettle, the discharge port of the reaction kettle is connected with the filter B through a connecting pipe, and the liquid phase outlet of the filter B is connected with the sodium mother liquid tank. The discharge hole of the reaction kettle is connected with the feed inlet of the reaction buffer kettle, and the discharge hole of the reaction buffer kettle is connected with the filter B. The reaction kettle and the reaction buffer kettle respectively comprise a dissolving area arranged on the reaction kettle and a crystallization area arranged under the reaction kettle, the dissolving area and the crystallization area in each kettle are communicated from top to bottom, and a feeding hole in each kettle is communicated with the dissolving area and a discharging hole is communicated with the crystallization area. A sodium sulfate hopper 24 and a weighing electronic belt scale 20 are arranged above the feeding hole of the reaction kettle, the outlet of the sodium sulfate potassium hopper is connected with the weighing electronic belt scale, and the tail end of the weighing electronic belt scale is positioned above the feeding hole of the reaction kettle. The two-stage conversion device comprises a two-stage conversion kettle 10 connected with the solid phase outlet of the filter B, and the two-stage conversion kettle is connected with the high potassium mother liquor tank.
In the preferred embodiment of the utility model, the potassium sulfate separating and washing device comprises a filter C11, a centrifuge B12 and a potassium mother liquor pool 13, wherein a liquid outlet of a sodium mother liquor pool is connected with the filter C through a connecting pipe, a hot water spray pipe is arranged above the filter C, a liquid phase outlet of the filter C is connected with the potassium mother liquor pool, a solid phase outlet of the filter C is connected with the centrifuge B, a liquid storage port of the centrifuge B is connected with the potassium mother liquor pool, and a liquid storage port of the potassium mother liquor pool is connected with the reaction kettle. Cooling device includes cooler 14, cooling kettle 15, freezing cauldron 16, cooling system, filter D17 and sodium mother liquor pond 18, the cooler, cooling kettle and freezing cauldron connect gradually, the liquid outlet of sodium mother liquor groove is linked together with the connecting pipe between cooler and the cooling kettle, cooling system is connected with freezing cauldron, the discharge gate and the filter D of freezing cauldron are connected, filter D's liquid phase exit linkage sodium mother liquor pond, filter D's solid phase export and two-stage conversion cauldron are connected, the liquid outlet and the cooler access connection in sodium mother liquor pond. In the above structure, the sodium chloride separating and washing device and the potassium sulfate separating and washing device both comprise a belt conveyor 21 for receiving solid materials output by the centrifuge.
In a preferred embodiment of the utility model, the filter A, the filter B, the filter C and the filter D are all vacuum belt filters, the filter A, the filter C and the filter D all comprise filter belts and a gas-liquid separator positioned below the filter belts, and the filter B comprises filter belts and two gas-liquid separators positioned below the filter belts. The sodium mother liquor tank is respectively connected with the circulating water feeding pipeline and the circulating water discharging pipeline.
In the preferred embodiment of the present invention, the cooling device further comprises a freezing buffer tank 22 located between the freezing tank and the filter D. The cooling system comprises a compressor unit, an evaporative condenser, a barrel pump unit and a siphon tank, wherein the compressor unit is respectively connected with the evaporative condenser and the siphon tank, and the barrel pump unit and the siphon tank are respectively connected with the freezing kettle.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A device system for producing potassium sulfate is characterized by comprising a salting-out device, a sodium chloride separation and washing device, a first-stage conversion device, a second-stage conversion device, a potassium sulfate separation and washing device and a cooling device; the salting-out device comprises a salting-out kettle (1) and a salting-out buffer kettle (2) communicated with the salting-out kettle; the sodium chloride separation washing device comprises a filter A (3), a centrifuge A (4), a high-potassium mother liquor tank (5) and a salt washing liquor tank (6), wherein a liquid outlet of the salting buffer kettle is connected with the filter A through a connecting pipe, and a liquid phase outlet of the filter A is respectively connected with the high-potassium mother liquor tank and the salt washing liquor tank; the first-stage conversion device comprises a reaction kettle (7), a filter B (8) and a sodium mother liquor tank (9), a discharge hole of the reaction kettle is connected with the filter B through a connecting pipe, and a liquid phase outlet of the filter B is connected with the sodium mother liquor tank; the second-stage conversion device comprises a second-stage conversion kettle (10) connected with the solid phase outlet of the filter B, and the second-stage conversion kettle is connected with the high-potassium mother liquid tank; the potassium sulfate separating and washing device comprises a filter C (11), a centrifuge B (12) and a potassium mother liquor tank (13), wherein a liquid outlet of the sodium mother liquor tank is connected with the filter C through a connecting pipe, a liquid phase outlet of the filter C is connected with the potassium mother liquor tank, a solid phase outlet of the filter C is connected with the centrifuge B, a liquid storage port of the centrifuge B is connected with the potassium mother liquor tank, and a liquid storage port of the potassium mother liquor tank is connected with the reaction kettle; cooling device includes cooler (14), cooling kettle (15), freezing cauldron (16), cooling system, filter D (17) and sodium mother liquor pond (18), the cooler the cooling kettle with freezing cauldron connects gradually, the liquid outlet in sodium mother liquor groove with the cooler with connecting pipe between the cooling kettle is linked together, cooling system with freezing cauldron is connected, freezing cauldron's discharge gate with filter D connects, filter D's liquid phase exit linkage sodium mother liquor pond, filter D's solid phase outlet with two sections conversion cauldron are connected, the liquid outlet in sodium mother liquor pond with cooler access connection.
2. The device system of claim 1, wherein a reaction buffer kettle (19) is further arranged between the reaction kettle and the filter B, a discharge hole of the reaction kettle is connected with a feed inlet of the reaction buffer kettle, and a discharge hole of the reaction buffer kettle is connected with the filter B.
3. The apparatus system according to claim 2, wherein the salting-out tank, the reaction tank and the reaction buffer tank each comprise a dissolving zone disposed above and a crystallizing zone disposed below, the dissolving zone and the crystallizing zone in each tank are communicated with each other up and down, and a feed inlet on each tank is communicated with the dissolving zone and a discharge outlet is communicated with the crystallizing zone.
4. The device system according to claim 1, wherein a hopper and a weighing electronic belt scale (20) are arranged above the feeding holes of the salting kettle and the reaction kettle, an outlet of the hopper is connected with the weighing electronic belt scale, and the tail end of the weighing electronic belt scale is positioned above the feeding hole of the corresponding kettle.
5. The plant system according to claim 1, characterized in that the sodium chloride separation and washing plant and the potassium sulphate separation and washing plant each comprise a belt conveyor (21) for receiving the solid material output by the centrifuge.
6. The apparatus system of claim 1, wherein said filter a, said filter B, said filter C, and said filter D are vacuum belt filters.
7. The system of claim 1, wherein the mother liquor tank is connected to a circulating feed water line and a circulating sewer system, respectively.
8. The apparatus system according to claim 1, wherein the cooling apparatus further comprises a freezing buffer tank (22) between the freezing tank and the filter D.
9. The device system of claim 1, wherein the cooling system comprises a compressor unit, an evaporative condenser, a barrel pump unit, and a siphon tank, the compressor unit being connected to the evaporative condenser and the siphon tank, respectively, the barrel pump unit and the siphon tank being connected to the freezing kettle, respectively.
10. The apparatus system of claim 1, wherein the salting buffer tank is in communication with a steam manifold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220427885.3U CN216687516U (en) | 2022-02-28 | 2022-02-28 | Device system for producing potassium sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220427885.3U CN216687516U (en) | 2022-02-28 | 2022-02-28 | Device system for producing potassium sulfate |
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| Publication Number | Publication Date |
|---|---|
| CN216687516U true CN216687516U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220427885.3U Active CN216687516U (en) | 2022-02-28 | 2022-02-28 | Device system for producing potassium sulfate |
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| Country | Link |
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| CN (1) | CN216687516U (en) |
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2022
- 2022-02-28 CN CN202220427885.3U patent/CN216687516U/en active Active
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