Preparation device of ferrous sulfate monohydrate

Abstract

The utility model provides a ferrous sulfate monohydrate preparation device which comprises a pulping tank, a crystal transformation tank, a first solid-liquid separator and an evaporator which are sequentially connected, and the pulping tank is provided with a ferrous sulfate heptahydrate solid feeding port, a high-temperature condensate water inlet, a crystal mush filtrate inlet and a ferrous sulfate solution discharging port. The crystal transformation tank comprises a first ferrous sulfate solution feed port and a ferrous sulfate crystal slurry discharge port, the pulping tank and / or the crystal transformation tank are / is provided with a secondary steam inlet, and the first ferrous sulfate solution feed port is connected with the ferrous sulfate solution discharge port; the first solid-liquid separator is used for carrying out solid-liquid separation on the ferrous sulfate crystal mush discharged from the first ferrous sulfate crystal mush outlet to obtain ferrous sulfate monohydrate solid and primary filtrate. According to the utility model, high-temperature condensate water and crystal mush produced in the evaporation process are used for dissolving ferrous sulfate heptahydrate to provide a heat source, so that the resource utilization rate is improved, energy is saved, consumption is reduced, and the sewage treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a preparation device of ferrous sulfate monohydrate. Background Art

[0002] The traditional wet process of producing ferrous sulfate monohydrate is as follows: the solid ferrous sulfate heptahydrate enters the pulping tank, where it is heated and pulped with steam to dissolve to obtain ferrous sulfate mother liquor, which is then pumped to the wet crystal conversion tank for heating and crystal conversion. The water content of the ferrous sulfate mother liquor evaporates, and it is gradually dehydrated in the wet crystal conversion tank to become gray-white ferrous monohydrate crystals, i.e., crystal slurry. When all the liquid in the tank is converted into gray-white liquid, the converted crystal slurry is separated into solid and liquid by a centrifuge. Part of the filtrate after solid-liquid separation is returned to the pulping tank for reuse, and the rest of the ferrous sulfate mother liquor is discharged for treatment.

[0003] The traditional wet production process has the following defects: about 29.6% of ferrous sulfate is still dissolved in the filtrate produced during the solid-liquid separation of ferrous sulfate monohydrate, and only part of the filtrate is recycled, while the other part is directly discharged, which wastes resources and increases the cost of sewage treatment.

[0004] The Chinese patent document discloses a "method and device for producing ferrous sulfate monohydrate", with the publication number CN113371763A. The invention's crystal transfer tank is equipped with a steam compressor, a condenser and a solid-liquid separator, which can save energy and reduce emissions, greatly reducing the production cost of ferrous sulfate monohydrate crystals and having promotion value. However, the device requires the use of a steam compressor, which has high equipment cost and high production cost. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a preparation device for ferrous sulfate monohydrate, which is used to solve the problems of low resource utilization and high sewage treatment cost in the traditional ferrous sulfate monohydrate wet production process.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides a preparation device of ferrous sulfate water, comprising a beating tank, a crystal conversion tank, a first solid-liquid separator and an evaporator connected in sequence, the beating tank is provided with a solid feeding port of ferrous sulfate heptahydrate, a high-temperature condensed water inlet, a slurry filtrate inlet and a ferrous sulfate solution discharge port, the crystal conversion tank comprises a first ferrous sulfate solution feeding port and a ferrous sulfate slurry discharge port, the beating tank and / or the crystal conversion tank is provided with a secondary steam inlet; the first ferrous sulfate solution feeding port is connected to the ferrous sulfate solution discharge port, the first solid-liquid separator is used for solid-liquid separation of the ferrous sulfate slurry discharged from the first ferrous sulfate slurry discharge port to obtain ferrous sulfate monohydrate solid and a primary filtrate; the evaporator is provided with a primary filtrate inlet, a secondary steam outlet, a raw steam inlet, a high-temperature condensed water discharge port and a primary concentrated filtrate discharge port, the secondary steam outlet is connected to the secondary steam inlet, the high-temperature condensed water discharge port is connected to the high-temperature condensed water inlet, and the primary concentrated filtrate discharge port is connected to the slurry filtrate inlet.

[0007] Preferably, the beating tank is provided with a flash cooler. The flash cooler is used for low-temperature flash evaporation of the ferrous sulfate solution, which can balance the secondary steam, high-temperature condensed water and residual heat of the crystal slurry obtained by the evaporator. The concentration of the ferrous sulfate solution can be increased before the crystal transformation through low-temperature flash evaporation of the ferrous sulfate solution, while maximizing the use of the secondary steam, high-temperature condensed water and residual heat of the crystal slurry generated by the evaporator.

[0008] Preferably, a flash evaporator and a second solid-liquid separator are sequentially arranged between the evaporator and the beating tank, the flash evaporator is provided with a high-temperature primary concentrated filtrate inlet, a flash steam outlet and a low-temperature primary concentrated filtrate outlet, the second solid-liquid separator is used for solid-liquid separation of the low-temperature primary concentrated filtrate discharged from the low-temperature primary concentrated filtrate outlet to obtain ferrous sulfate monohydrate solid and slurry filtrate, and the beating tank is also provided with a flash steam inlet, which is connected to the flash steam outlet. If beating cannot balance the use of secondary steam, a flash evaporator can be used to perform low-temperature flash evaporation on the beating material to evaporate a small amount of water.

[0009] Preferably, the evaporator is further provided with a concentrated filtrate circulation outlet, the concentrated filtrate circulation outlet is connected to the primary filtrate inlet via a circulation pipeline, and a circulation pump is provided on the circulation pipeline.

[0010] The utility model also provides a preparation device of ferrous sulfate water, comprising a beating tank, an evaporator and a third solid-liquid separator, the beating tank being provided with a solid feeding port of ferrous sulfate heptahydrate, a high-temperature condensed water inlet, a slurry filtrate inlet, a ferrous sulfate solution discharge port and a secondary steam inlet, the evaporator being provided with a second ferrous sulfate solution feeding port, a secondary steam outlet, a raw steam inlet, a high-temperature condensed water discharge port and a slurry discharge port, the secondary steam outlet being connected to the secondary steam inlet, the high-temperature condensed water discharge port being connected to the high-temperature condensed water inlet, the ferrous sulfate solution discharge port being connected to the first ferrous sulfate solution feeding port, and the third solid-liquid separator being used for solid-liquid separation of the ferrous sulfate slurry discharged from the slurry discharge port to obtain ferrous sulfate monohydrate solid and slurry filtrate.

[0011] Preferably, the beating tank is provided with a flash cooler, the flash cooler is connected to a vacuum generator, the flash cooler is provided with a cooling water inlet, a cooling water outlet, a low-concentration ferrous sulfate solution inlet and a high-concentration ferrous sulfate solution outlet, the beating tank is provided with a low-concentration ferrous sulfate solution outlet and a high-concentration ferrous sulfate solution inlet, the low-concentration ferrous sulfate solution outlet is connected to the low-concentration ferrous sulfate solution inlet, and the high-concentration ferrous sulfate solution inlet is connected to the high-concentration ferrous sulfate solution outlet.

[0012] Preferably, a heat exchanger is provided between the beating tank and the evaporator, and the heat exchanger is provided with a heat medium inlet, a heat medium outlet, a low-temperature ferrous sulfate solution inlet and a high-temperature ferrous sulfate solution outlet, the heat medium inlet is connected to the high-temperature condensate water discharge outlet, and the heat medium outlet is connected to the high-temperature condensate water inlet; the low-temperature ferrous sulfate solution inlet is connected to the ferrous sulfate solution discharge port, and the high-temperature ferrous sulfate solution outlet is connected to the ferrous sulfate solution feed port.

[0013] Preferably, the evaporator is further provided with a slurry circulation outlet, the slurry circulation outlet is connected to the ferrous sulfate solution feed port via a circulation pipeline, and a circulation pump is provided on the circulation pipeline.

[0014] As described above, the utility model has the following beneficial effects: high-temperature and high-pressure raw steam is used to evaporate, concentrate and crystallize the ferrous sulfate monohydrate slurry or filtrate after crystallization, and the secondary steam produced in the evaporation process is used for crystallization or dissolution of ferrous sulfate heptahydrate. At the same time, the high-temperature condensed water produced in the evaporation process and the waste heat of the slurry are used to provide a heat source for dissolving ferrous sulfate heptahydrate, which not only improves resource utilization, saves energy and reduces consumption, but also reduces sewage treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of a device for preparing ferrous sulfate monohydrate according to Example 1.

[0016] Figure 2 Shown is a schematic diagram of the principle of the device for preparing ferrous sulfate monohydrate in Example 1.

[0017] Figure 3 Shown is a schematic structural diagram of a device for preparing ferrous sulfate monohydrate according to Example 2.

[0018] Figure 4 Shown is a schematic diagram of the principle of the device for preparing ferrous sulfate monohydrate according to Example 2.

[0019] Figure 5 Shown is a schematic structural diagram of a device for preparing ferrous sulfate monohydrate according to Example 3.

[0020] Figure 6 Shown is a schematic diagram of the principle of the device for preparing ferrous sulfate monohydrate according to Example 3.

[0021] Figure 7 Shown is a schematic structural diagram of a device for preparing ferrous sulfate monohydrate according to Example 4.

[0022] Figure 8 Shown is a schematic diagram of the principle of the device for preparing ferrous sulfate monohydrate according to Example 4.

[0023] Description of the accompanying drawings: 1. Beating tank; 11. Ferrous sulfate heptahydrate solid feeding port; 12. High-temperature condensed water inlet; 13. Slurry filtrate inlet; 14. Ferrous sulfate solution discharge port; 15. Flash steam inlet; 16. Flash cooler; 17. Vacuum generator; 161. Cooling water inlet; 162. Cooling water outlet; 163. Low-concentration ferrous sulfate solution inlet; 164. High-concentration ferrous sulfate solution outlet; 165. High-concentration ferrous sulfate solution inlet; 166. Low-concentration ferrous sulfate solution outlet; 2. Crystal conversion tank; 21. First ferrous sulfate solution feed port; 22. Secondary steam inlet; 23. Ferrous sulfate slurry discharge port; 3. First solid-liquid separator; 4. Evaporator ; 41. Primary filtrate inlet; 42. Secondary steam outlet; 43. Raw steam inlet; 44. High-temperature condensed water outlet; 45. Primary concentrated filtrate outlet; 46. Secondary ferrous sulfate solution feed inlet; 47. Slurry outlet; 48. Concentrated filtrate circulation outlet; 49. Slurry circulation outlet; 5. Flash evaporator; 51. High-temperature primary concentrated filtrate inlet; 52. Flash steam outlet; 53. Low-temperature primary concentrated filtrate outlet; 6. Second solid-liquid separator; 7. Third solid-liquid separator; 8. Heat exchanger; 81. Heat medium inlet; 82. Heat medium outlet; 83. Low-temperature ferrous sulfate solution inlet; 84. High-temperature ferrous sulfate solution outlet; 9. Circulation pump; 10. Transfer pump. DETAILED DESCRIPTION

[0024] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0025] Example 1

[0026] like Figure 1 As shown, the embodiment of the present application provides a preparation device of ferrous sulfate monohydrate, including a beating tank 1, a wet crystal conversion tank 2, a first solid-liquid separator 3 and an evaporator 4 connected in sequence, the beating tank is provided with a solid feeding port 11 of ferrous sulfate heptahydrate, a high-temperature condensed water inlet 12, a slurry filtrate inlet 13 and a ferrous sulfate solution discharge port 14, the wet crystal conversion tank includes a first ferrous sulfate solution feed port 21, a secondary steam inlet 22 and a ferrous sulfate slurry discharge port 23, the first ferrous sulfate solution feed port is connected to the ferrous sulfate solution discharge port, the first solid-liquid separator is used for solid-liquid separation of the first ferrous sulfate solution The ferrous sulfate slurry discharged from the iron crystal slurry outlet obtains ferrous sulfate monohydrate solid and primary filtrate; the evaporator is provided with a primary filtrate inlet 41, a secondary steam outlet 42, a raw steam inlet 43, a high-temperature condensed water outlet 44, a primary concentrated filtrate outlet 45 and a concentrated filtrate circulation outlet 48, the concentrated filtrate circulation outlet is connected to the primary filtrate inlet through a circulation pipeline, a circulation pump 9 is provided on the circulation pipeline, the secondary steam outlet is connected to the secondary steam inlet, the high-temperature condensed water outlet is connected to the high-temperature condensed water inlet, and the primary concentrated filtrate outlet is connected to the slurry filtrate inlet. A second solid-liquid separator 6 is provided between the evaporator 4 and the beating tank 1, and the second solid-liquid separator is used for solid-liquid separation of the primary concentrated filtrate discharged from the primary concentrated filtrate outlet 45 of the evaporator 4 to obtain ferrous sulfate monohydrate solid and slurry filtrate. A material transfer pump 10 is provided between the beating tank 1 and the wet crystal conversion tank 2, and between the wet crystal conversion tank 2 and the first solid-liquid separator 3. The first solid-liquid separator 3 and the second solid-liquid separator 6 are both centrifuges.

[0027] The working principle of the preparation device of ferrous sulfate monohydrate of this embodiment is as follows:

[0028] Combination Figure 1 and Figure 2, the solid ferrous sulfate heptahydrate is fed into the beating tank 1 from the ferrous sulfate heptahydrate solid feeding port 11, the liquid used for beating is the 100°C slurry filtrate produced by the second solid-liquid separator 6, and the heat required by the beating tank is provided by the 120°C high-temperature condensed water, 100°C secondary steam and 100°C slurry filtrate produced by the evaporator 4; a 60°C ferrous sulfate solution is prepared; the 60°C ferrous sulfate solution is discharged from the ferrous sulfate solution discharge port 14 of the beating tank 1 and then pumped into the wet crystal conversion tank 2 from the first ferrous sulfate solution feed port 21 through the transfer pump 10, the heat used for crystal conversion is the 100°C secondary steam produced by the evaporator 4, the ferrous sulfate solution is heated in the crystal conversion tank, and is completely converted into 110°C ferrous sulfate monohydrate crystal slurry;

[0029] The 110°C ferrous sulfate monohydrate slurry is subjected to solid-liquid separation by a first solid-liquid separator 3, and the obtained solid is ferrous sulfate monohydrate, and the liquid is a primary filtrate at 100°C;

[0030] The 100°C primary filtrate is pumped into the evaporator 4 from the primary filtrate inlet 41 through the circulation pump 9, and 120°C raw steam is introduced from the raw steam inlet 43 to evaporate and concentrate the primary filtrate to obtain 100°C secondary steam and 105°C primary concentrated filtrate, wherein a part of the 100°C secondary steam discharged from the secondary steam outlet 42 enters the crystal conversion tank 2 to provide heat for wet crystal conversion in the next cycle, and the other part enters the beating tank 1 to dissolve the ferrous sulfate heptahydrate solid in the next cycle; a part of the 105°C primary concentrated filtrate passes through the circulation pump 9 again and is pumped into the evaporator 4 from the primary filtrate inlet 41 for secondary evaporation and concentration, and another part of the 105°C primary concentrated filtrate is separated by solid-liquid separation in the second solid-liquid separator 6 to obtain ferrous sulfate monohydrate and 100°C slurry filtrate, and the 100°C slurry filtrate enters the beating tank 1 from the slurry filtrate inlet 13 to dissolve the ferrous sulfate heptahydrate solid in the next cycle.

[0031] Example 2

[0032] like Figure 3As shown, an embodiment of the present application provides a device for preparing ferrous sulfate monohydrate, including a beating tank 1, an evaporator 4 and a third solid-liquid separator 7, the beating tank is provided with a flash cooler 16, the flash cooler is connected to a vacuum generator 17, the flash cooler is provided with a cooling water inlet 161, a cooling water outlet 162, a low-concentration ferrous sulfate solution inlet 163 and a high-concentration ferrous sulfate solution outlet 164, the beating tank is provided with a high-concentration ferrous sulfate solution inlet 165 and a low-concentration ferrous sulfate solution outlet 166, the low-concentration ferrous sulfate solution outlet is connected to the low-concentration ferrous sulfate solution inlet, and the high-concentration ferrous sulfate solution inlet is connected to the high-concentration ferrous sulfate solution outlet. The beating tank is also provided with a solid feeding port 11 of ferrous sulfate heptahydrate, a high-temperature condensed water inlet 12, a slurry filtrate inlet 13, a ferrous sulfate solution discharge port 14 and a secondary steam inlet 22. The evaporator is provided with a second ferrous sulfate solution feeding port 46, a secondary steam outlet 42, a raw steam inlet 43, a high-temperature condensed water discharge port 44, a slurry discharge port 47 and a slurry circulation discharge port 49. The slurry circulation discharge port is connected to the ferrous sulfate solution feeding port through a circulation pipeline. A circulation pump 9 is provided on the circulation pipeline. The secondary steam outlet is connected to the secondary steam inlet. The high-temperature condensed water discharge port is connected to the high-temperature condensed water inlet. The ferrous sulfate solution discharge port is connected to the first ferrous sulfate solution feeding port. The third solid-liquid separator is used for solid-liquid separation of the ferrous sulfate slurry discharged from the slurry discharge port to obtain ferrous sulfate monohydrate solid and slurry filtrate.

[0033] The working principle of the preparation device of ferrous sulfate monohydrate of this embodiment is as follows:

[0034] Combination Figure 3 and Figure 4 , the solid ferrous sulfate heptahydrate is fed into the beating tank 1 from the solid ferrous sulfate heptahydrate feeding port 11, the liquid used for beating is the 100°C slurry filtrate produced by the third solid-liquid separator 7, and the heat required by the beating tank is provided by the 100°C secondary steam produced by the evaporator 4 and the 100°C low-temperature condensed water obtained by preheating the ferrous sulfate solution by the heat exchanger; a low-concentration ferrous sulfate solution at 80°C is obtained;

[0035] The 80°C low-concentration ferrous sulfate solution is flashed through the flash cooler 16 to produce high-temperature steam, which is condensed by cooling water and discharged as condensed water. At the same time, a 70°C high-concentration ferrous sulfate solution is obtained, which is returned to the beating tank 1 from the high-concentration ferrous sulfate solution inlet 165, and is pumped into the evaporator 4 from the ferrous sulfate solution outlet 14 through the transfer pump 10. 130°C raw steam is introduced from the raw steam inlet 43 to evaporate and concentrate the 70°C high-concentration ferrous sulfate solution to obtain 100°C secondary steam, 105°C ferrous sulfate crystal slurry and 130°C high-temperature condensed water; wherein, the secondary steam is condensed into ...concentration ferrous sulfate solution. After being discharged from the steam outlet 42, the steam enters the beating tank 1 through the secondary steam inlet 22 to dissolve the ferrous sulfate heptahydrate solid in the next cycle; a part of the 105°C primary concentrated filtrate is pumped into the evaporator 4 again from the second ferrous sulfate solution feed inlet 46 through the circulation pump 9 for secondary evaporation and concentration; another part of the 105°C primary concentrated filtrate is separated by solid and liquid in the third solid-liquid separator 7 to produce a 100°C slurry filtrate, and the 100°C slurry filtrate enters the beating tank 1 from the slurry filtrate inlet 13 to dissolve the ferrous sulfate heptahydrate solid in the next cycle.

[0036] Example 3

[0037] like Figure 5As shown, the embodiment of the present application provides a preparation device of ferrous sulfate monohydrate, including a beating tank 1, a wet crystal conversion tank 2, a first solid-liquid separator 3 and an evaporator 4 connected in sequence, the beating tank is provided with a solid feeding port 11 of ferrous sulfate heptahydrate, a high-temperature condensed water inlet 12, a slurry filtrate inlet 13 and a ferrous sulfate solution discharge port 14, the wet crystal conversion tank includes a first ferrous sulfate solution feed port 21, a secondary steam inlet 22 and a ferrous sulfate slurry discharge port 23, the first ferrous sulfate solution feed port is connected to the ferrous sulfate solution discharge port, the first solid-liquid separator is used for solid-liquid separation of the first ferrous sulfate solution The ferrous sulfate slurry discharged from the iron crystal slurry outlet obtains ferrous sulfate monohydrate solid and primary filtrate; the evaporator is provided with a primary filtrate inlet 41, a secondary steam outlet 42, a raw steam inlet 43, a high-temperature condensed water outlet 44, a primary concentrated filtrate outlet 45 and a concentrated filtrate circulation outlet 48, the concentrated filtrate circulation outlet is connected to the primary filtrate inlet through a circulation pipeline, a circulation pump 9 is provided on the circulation pipeline, the secondary steam outlet is connected to the secondary steam inlet, the high-temperature condensed water outlet is connected to the high-temperature condensed water inlet, and the primary concentrated filtrate outlet is connected to the slurry filtrate inlet. A flash evaporator 5 and a second solid-liquid separator 6 are sequentially provided between the evaporator and the beating tank, the flash evaporator is provided with a high-temperature primary concentrated filtrate inlet 51, a flash steam outlet 52 and a low-temperature primary concentrated filtrate outlet 53, the second solid-liquid separator is used for solid-liquid separation of the low-temperature primary concentrated filtrate discharged from the low-temperature primary concentrated filtrate outlet to obtain ferrous sulfate monohydrate solid and slurry filtrate. A material transfer pump 10 is provided between the pulping tank 1 and the wet crystal conversion tank 2, and between the wet crystal conversion tank 2 and the first solid-liquid separator 3. The first solid-liquid separator 3 and the second solid-liquid separator 6 are both centrifuges.

[0038] The working principle of the preparation device of ferrous sulfate monohydrate of this embodiment is as follows:

[0039] Combination Figure 5 and Figure 6 , the solid ferrous sulfate heptahydrate is fed into the beating tank 1 from the solid ferrous sulfate heptahydrate feeding port 11, the liquid used for beating is the 80°C slurry filtrate produced by the second solid-liquid separator 6, and the heat required by the beating tank is provided by the 150°C high-temperature condensed water produced by the evaporator 4 and the 75°C flash steam produced by the flash evaporation of the 130°C primary concentrated filtrate; a 60°C ferrous sulfate solution is obtained;

[0040] The 60°C ferrous sulfate solution is discharged from the ferrous sulfate solution outlet 14 of the beating tank 1 and then pumped into the wet crystallization tank 2 from the first ferrous sulfate solution feed port 21 through the transfer pump 10. The heat used for crystallization is the 120°C secondary steam produced by the evaporator 4. The ferrous sulfate solution is heated in the crystallization tank and is completely converted into 110°C ferrous sulfate monohydrate crystal slurry.

[0041] The 110°C ferrous sulfate monohydrate slurry is subjected to solid-liquid separation by a first solid-liquid separator 3, and the obtained solid is ferrous sulfate monohydrate, and the liquid is a primary filtrate at 100°C;

[0042] The 100°C primary filtrate is pumped into the evaporator 4 from the primary filtrate inlet 41 through the circulation pump 9, and 150°C raw steam is introduced from the raw steam inlet 43 to evaporate and concentrate the primary filtrate to obtain 120°C secondary steam and 130°C primary concentrated filtrate, wherein the secondary steam is discharged from the secondary steam outlet 42 and enters the wet crystallization tank 2 through the secondary steam inlet 22 to provide heat for the wet crystallization in the next cycle; a part of the 130°C primary concentrated filtrate is again pumped into the evaporator 4 from the primary filtrate inlet 41 through the circulation pump 9 for secondary evaporation and concentration, and the 130°C primary concentrated filtrate The other part enters the flash evaporator 5 from the high-temperature primary concentrated filtrate inlet 51 for flash evaporation to obtain 75°C flash steam and 85°C low-temperature concentrated filtrate, wherein the 75°C flash steam is discharged from the flash steam outlet 52 and then enters the pulping tank 1 from the flash steam inlet 15 to dissolve the ferrous sulfate heptahydrate solid in the next cycle; the 85°C low-temperature concentrated filtrate is subjected to solid-liquid separation in the second solid-liquid separator 6 to obtain ferrous sulfate monohydrate and 80°C slurry filtrate, and the 80°C slurry filtrate enters the pulping tank 1 from the slurry filtrate inlet 13 to dissolve the ferrous sulfate heptahydrate solid in the next cycle.

[0043] Example 4

[0044] like Figure 7As shown, an embodiment of the present application provides a preparation device for ferrous sulfate monohydrate, including a beating tank 1, an evaporator 4 and a third solid-liquid separator 7, the beating tank is provided with a solid feeding port 11 of ferrous sulfate heptahydrate, a high-temperature condensed water inlet 12, a slurry filtrate inlet 13, a ferrous sulfate solution discharge port 14 and a secondary steam inlet 22, the evaporator is provided with a second ferrous sulfate solution feed port 46, a secondary steam outlet 42, a raw steam inlet 43, a high-temperature condensed water discharge port 44, a slurry discharge port 47 and a slurry circulation discharge port 49, the slurry circulation discharge port is connected to the ferrous sulfate solution feed port through a circulation pipeline, a circulation pump 9 is provided on the circulation pipeline, the secondary steam outlet is connected to the secondary steam inlet, the high-temperature condensed water discharge port is connected to the high-temperature condensed water inlet, the ferrous sulfate solution discharge port is connected to the first ferrous sulfate solution feed port, and the third solid-liquid separator is used for solid-liquid separation of the ferrous sulfate slurry discharged from the slurry discharge port to obtain ferrous sulfate monohydrate solid and slurry filtrate. A heat exchanger 8 is provided between the pulping tank and the evaporator. The heat exchanger is provided with a heat medium inlet 81, a heat medium outlet 82, a low-temperature ferrous sulfate solution inlet 83 and a high-temperature ferrous sulfate solution outlet 84. The heat medium inlet is connected to the high-temperature condensate water discharge outlet, and the heat medium outlet is connected to the high-temperature condensate water inlet; the low-temperature ferrous sulfate solution inlet is connected to the ferrous sulfate solution discharge port, and the high-temperature ferrous sulfate solution outlet is connected to the ferrous sulfate solution feed port. A material transfer pump 10 is provided between the pulping tank 1 and the heat exchanger 4.

[0045] The working principle of the preparation device of ferrous sulfate monohydrate of this embodiment is as follows:

[0046] Combination Figure 7 and Figure 8 , the solid ferrous sulfate heptahydrate is fed into the beating tank 1 from the solid ferrous sulfate heptahydrate feeding port 11, the liquid used for beating is the 100°C slurry filtrate produced by the third solid-liquid separator 7, and the heat required by the beating tank is provided by the 100°C secondary steam produced by the evaporator 4 and the 100°C low-temperature condensed water obtained by preheating the ferrous sulfate solution by the heat exchanger; and an 80°C ferrous sulfate solution is obtained;

[0047] The 80°C ferrous sulfate solution is preheated by the heat exchanger 8 to obtain a 100°C ferrous sulfate solution. The heat medium of the heat exchanger 8 is the 150°C high-temperature condensed water produced by the evaporator 4. The produced 100°C low-temperature condensed water enters the beating tank 1 from the high-temperature condensed water inlet 12 to dissolve the ferrous sulfate heptahydrate solid in the next cycle.

[0048] The 100°C ferrous sulfate solution is pumped into the evaporator 4 from the second ferrous sulfate solution feed port 46 through the circulation pump 9, and the 150°C raw steam is introduced from the raw steam inlet 43 to evaporate and concentrate the 100°C ferrous sulfate solution to obtain 100°C secondary steam, 105°C ferrous sulfate slurry and 150°C high-temperature condensed water; wherein, the secondary steam outlet 42 is discharged and then enters the beating tank 1 through the secondary steam inlet 22 to be used for dissolving the ferrous sulfate heptahydrate solid in the next cycle; a part of the 130°C primary concentrated filtrate is passed through the The circulation pump 9 again pumps the second ferrous sulfate solution into the evaporator 4 from the second ferrous sulfate solution feed port 46 for secondary evaporation and concentration; another part of the 130°C primary concentrated filtrate is separated by the third solid-liquid separator 7 to produce a 100°C slurry filtrate, and the 100°C slurry filtrate enters the beating tank 1 from the slurry filtrate inlet 13 for dissolving the ferrous sulfate heptahydrate solid in the next cycle; the 150°C high-temperature condensed water enters the heat exchanger 8 from the heat medium inlet 81 for preheating the ferrous sulfate solution to be concentrated and crystallized in the next cycle.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for preparing ferrous sulfate monohydrate, characterized in that: The invention comprises a beating tank (1), a crystal conversion tank (2), a first solid-liquid separator (3) and an evaporator (4) which are connected in sequence, wherein the beating tank is provided with a ferrous sulfate heptahydrate solid feeding port (11), a high-temperature condensed water inlet (12), a slurry filtrate inlet (13) and a ferrous sulfate solution discharge port (14), the crystal conversion tank comprises a first ferrous sulfate solution feeding port (21) and a ferrous sulfate crystal slurry discharge port (23), the beating tank and / or the crystal conversion tank are provided with a secondary steam inlet (22), the first ferrous sulfate solution feeding port and the ferrous sulfate solution discharge port are connected to each other, and the first ferrous sulfate solution feeding port and the ferrous sulfate solution discharge port are connected to each other. The first solid-liquid separator is used for solid-liquid separation of the ferrous sulfate slurry discharged from the first ferrous sulfate slurry discharge outlet to obtain ferrous sulfate monohydrate solid and a primary filtrate; the evaporator is provided with a primary filtrate inlet (41), a secondary steam outlet (42), a raw steam inlet (43), a high-temperature condensed water outlet (44) and a primary concentrated filtrate outlet (45), the secondary steam outlet is connected to the secondary steam inlet, the high-temperature condensed water outlet is connected to the high-temperature condensed water inlet, and the primary concentrated filtrate outlet is connected to the slurry filtrate inlet.

2. The preparation device according to claim 1, characterized in that: The beating tank is provided with a flash cooler.

3. The preparation device according to claim 1, characterized in that: A flash evaporator (5) and a second solid-liquid separator (6) are sequentially arranged between the evaporator and the beating tank. The flash evaporator is provided with a high-temperature primary concentrated filtrate inlet (51), a flash steam outlet (52) and a low-temperature primary concentrated filtrate outlet (53). The second solid-liquid separator is used for solid-liquid separation of the low-temperature primary concentrated filtrate discharged from the low-temperature primary concentrated filtrate outlet to obtain ferrous sulfate monohydrate solid and slurry filtrate. The beating tank is also provided with a flash steam inlet (15), which is connected to the flash steam outlet; the evaporator is also provided with a concentrated filtrate circulation outlet (48), which is connected to the primary filtrate inlet through a circulation pipeline, and a circulation pump (9) is provided on the circulation pipeline.

4. A device for preparing ferrous sulfate monohydrate, characterized in that: The invention comprises a beating tank (1), an evaporator (4) and a third solid-liquid separator (7), wherein the beating tank is provided with a solid ferrous sulfate heptahydrate feeding port (11), a high-temperature condensed water inlet (12), a slurry filtrate inlet (13), a ferrous sulfate solution discharge port (14) and a secondary steam inlet (22), and the evaporator is provided with a second ferrous sulfate solution feeding port (46), a secondary steam outlet (42), a raw steam inlet (43), a high-temperature condensed water discharge port (44) and a slurry discharge port (47), wherein the secondary steam outlet is connected to the secondary steam inlet, the high-temperature condensed water discharge port is connected to the high-temperature condensed water inlet, the ferrous sulfate solution discharge port is connected to the first ferrous sulfate solution feeding port, and the third solid-liquid separator is used for solid-liquid separation of the ferrous sulfate slurry discharged from the slurry discharge port to obtain ferrous sulfate monohydrate solid and slurry filtrate.

5. The preparation device according to claim 4, characterized in that: The beating tank is provided with a flash cooler (16), the flash cooler is connected to a vacuum generator (17), the flash cooler is provided with a cooling water inlet (161), a cooling water outlet (162), a low-concentration ferrous sulfate solution inlet (163) and a high-concentration ferrous sulfate solution outlet (164), the beating tank is provided with a high-concentration ferrous sulfate solution inlet (165) and a low-concentration ferrous sulfate solution outlet (166), the low-concentration ferrous sulfate solution outlet is connected to the low-concentration ferrous sulfate solution inlet, and the high-concentration ferrous sulfate solution inlet is connected to the high-concentration ferrous sulfate solution outlet.

6. The preparation device according to claim 4, characterized in that: A heat exchanger (8) is provided between the beating tank and the evaporator, the heat exchanger being provided with a heat medium inlet (81), a heat medium outlet (82), a low-temperature ferrous sulfate solution inlet (83) and a high-temperature ferrous sulfate solution outlet (84), the heat medium inlet being connected to the high-temperature condensate water outlet, and the heat medium outlet being connected to the high-temperature condensate water inlet; The low-temperature ferrous sulfate solution inlet is connected to the ferrous sulfate solution outlet, and the high-temperature ferrous sulfate solution outlet is connected to the ferrous sulfate solution feed inlet.

7. The preparation device according to claim 4, characterized in that: The evaporator is also provided with a slurry circulation outlet (49), which is connected to the ferrous sulfate solution feed port via a circulation pipeline, and a circulation pump (9) is provided on the circulation pipeline.

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