A kind of ferrous fumarate production process and manufacturing equipment

Abstract

The invention discloses a ferrous fumarate production process and manufacturing equipment thereof, and belongs to the technical field of ferrous fumarate production. It includes a water storage tank, a first liquid dispensing unit, a second liquid dispensing unit, a horizontal storage tank, a synthesis unit and a solid-liquid separation unit, wherein the water storage tank is provided with a tap water inlet valve and a liquid return valve; the first liquid dispensing unit includes a first liquid dispensing tank, a heating jacket is provided on the outside of the first liquid dispensing tank, and an electric stirrer, a first powder feeder and a second powder feeder are provided on the upper part of the first liquid dispensing tank; the bottom of the water storage tank is connected to the top of the first liquid dispensing tank through a first valve body; the bottom of the first liquid dispensing tank is connected to a second valve body and a third valve body; the second liquid dispensing unit includes a second liquid dispensing tank, and the ferrous fumarate production process and manufacturing equipment thereof of the invention can realize online continuous production of ferrous fumarate, with high production efficiency, and during the production process, ferrous fumarate can be prepared in a closed loop without generating waste discharge.

Description

Technical Field

[0001] The invention specifically relates to a ferrous fumarate production process and manufacturing equipment thereof, and belongs to the technical field of ferrous fumarate production. Background Art

[0002] Ferrous fumarate is a reddish brown solid powder that can prevent various animals from iron deficiency anemia. After being refined, it can be used as a food additive. The process of ferrous fumarate is to add fumaric acid to sodium hydroxide or sodium carbonate aqueous solution to react to generate sodium fumarate, then add ferrous sulfate heptahydrate to react at a high temperature, cool the reaction solution, filter, wash, and dry to obtain the ferrous fumarate product; the mixed mother liquor is separated into solid and liquid by a centrifuge, and the mother liquor is returned to the reactor to continue the reaction, while the crystals are sent to the dryer for drying. When airflow drying or vacuum drying is used, the crystals gradually dry out as the drying process proceeds. Gradually drying and the crystal powder attached to the crystals are separated and lost with the flow of airflow, so the airflow is usually passed through a cyclone separator for separation and recovery of the crystal powder; for example, Chinese Patent Publication No.: CN116396161A discloses a ferrous fumarate production process and manufacturing equipment thereof, wherein the second reactor is cooled to produce a large amount of crystals and the solid-liquid mixture is sent to a centrifuge for solid-liquid separation, and step five: the separated crystals are sent to a drying device for drying, and then sent to a screening machine for screening to obtain a ferrous fumarate product; another example is Chinese Patent Authorization Announcement No.: CN107473956B, which discloses a ferrous fumarate production method, wherein after the centrifugal mother liquor and washing water are reused for a certain number of times, the ammonium sulfate concentration is high and can be directly sold as a nitrogen fertilizer, without any wastewater or waste gas, and the green production of ferrous fumarate can be realized; however, the ferrous fumarate of the above structure requires a long time for synthesis, cooling and drying, and the production cannot be continuous, and when the centrifugal mother liquor and washing water are used as nitrogen fertilizer, the liquid storage and transportation are inconvenient. Summary of the invention

[0003] To solve the above problems, the present invention proposes a ferrous fumarate production process and manufacturing equipment, which can realize online continuous production of ferrous fumarate with high production efficiency. During the production process, ferrous fumarate can be prepared in a closed loop without generating waste.

[0004] The ferrous fumarate production process and manufacturing equipment of the present invention include:

[0005] A water storage tank, wherein the water storage tank is provided with a tap water inlet valve and a liquid return valve;

[0006] A first liquid dispensing unit, the first liquid dispensing unit comprises a first liquid dispensing tank, a heating jacket is arranged outside the first liquid dispensing tank, an electric stirrer, a first powder feeder and a second powder feeder are arranged on the top of the first liquid dispensing tank; the bottom of the water storage tank is connected to the top of the first liquid dispensing tank through a first valve body; the bottom of the first liquid dispensing tank is connected to a second valve body and a third valve body;

[0007] A second liquid dispensing unit, the second liquid dispensing unit comprises a second liquid dispensing tank, a heating jacket is arranged outside the second liquid dispensing tank, an electric stirrer and a third powder feeder are arranged on the top of the second liquid dispensing tank; the bottom of the water storage tank is connected to the top of the second liquid dispensing tank through a fourth valve body; a fifth valve body is arranged at the bottom of the second liquid dispensing tank;

[0008] A horizontal storage tank, wherein a heating jacket is disposed outside the horizontal storage tank; the second valve body is connected to the horizontal storage tank; the third valve body and the fifth valve body are connected to the shunt pipe; the bottom of the horizontal storage tank is connected to the shunt pipe through a metering valve;

[0009] A synthesis unit, the synthesis unit comprising a first synthesis kettle and a second synthesis kettle, the first synthesis kettle and the second synthesis kettle are both provided with heating jackets on the outside; an electric stirrer and an electronic pH meter are provided on the top of the first synthesis kettle and the second synthesis kettle; a first diverter valve and a second diverter valve are connected to the bottom of the diverter pipe; the other ends of the first diverter valve and the second diverter valve are connected to the first synthesis kettle and the second synthesis kettle;

[0010] A solid-liquid separation unit, wherein the first synthesis kettle and the second synthesis kettle are respectively connected to the solid-liquid separation unit through bottom valves; the slag discharge port of the solid-liquid separation unit is connected to the drying unit; the liquid discharge port of the solid-liquid separation unit is connected to the filtrate filter through a pressure pump; the filtrate filter is connected to a buffer tank, and the buffer tank is connected to a liquid return valve through a liquid return pump.

[0011] Furthermore, a first temperature regulating tank is arranged between the solid-liquid separation unit and the filtrate filter, and the bottom of the first temperature regulating tank is connected to the filtrate filter through a pressure pump; the waste discharge end of the filtrate filter is connected to a slag pump through a waste discharge valve, and the slag pump is connected to an evaporation tank; a slag discharge port is arranged on the upper part of one side of the evaporation tank; a collecting bin is arranged outside the slag discharge port, and a scraper paddle driven by a motor is arranged inside the evaporation tank; a heat exchange chamber is arranged at the bottom of the evaporation tank, and the liquid inlet end of the heat exchange chamber is connected to a secondary temperature control tank; the secondary temperature control tank is connected to a supplementary heat valve, and the liquid discharge end of the heat exchange chamber is connected to a sixth valve body and a seventh valve body through a circulating pump, and the sixth valve body is connected to the secondary temperature control tank; the seventh valve body is connected to the first temperature regulating tank; an evaporation fan is arranged on the top of the evaporation tank; a recoil valve is connected between the return liquid pump and the return liquid valve, and the recoil valve is connected to the flushing end of the filtrate filter.

[0012] During operation, the first temperature regulating tank performs secondary cooling on the filtrate to allow sodium sulfate to be fully precipitated. Then, the mixed liquid is pressurized and pumped into the filtrate filter through the first temperature regulating tank through the pressure pump. The filtrate is pressurized and filtered through the filtrate filter, and the filtrate is sent to the buffer tank and sent to the water storage tank through the liquid return pump and the liquid return valve; wait for the filtrate to be reused for the second time; when the filtrate filter works for the set time, the pressure pump is turned off, the liquid return valve is closed, the backwash valve is opened, and the filtrate in the buffer tank is pressurized and pumped into the filtrate filter through the liquid return pump and the backwash valve; then, the backwashed solid-liquid mixed liquid is sent to the evaporation tank through the slag pump; at the same time, the first temperature regulating tank pumps the filtrate into the secondary temperature control tank through the heat supplement valve, so that the filtrate is secondary reduced to the set temperature degree, and pump the filtrate into the heat exchange chamber, then, the filtrate that has completed heat exchange is pumped into the secondary temperature control tank through the sixth valve body through the circulation pump, when the secondary temperature control tank drops to the lower temperature limit, the sixth valve body is closed, and the supplementary heat valve and the seventh valve body are opened; when the temperature of the secondary temperature control tank reaches the upper temperature limit, the supplementary heat valve and the seventh valve body are closed again, and the sixth valve body is opened again to continuously provide the evaporation temperature to the bottom of the evaporation pool. During evaporation, the evaporation fan is turned on to increase the evaporation rate of water; after evaporation is completed, the motor drives the scraper to scrape the sodium sulfate into the slag discharge port and store it in the aggregate bin. After scraping is completed, the slag pump can be turned on again to send the backwashed solid-liquid mixture into the evaporation pool through the slag pump.

[0013] Furthermore, the solid-liquid separation unit includes an outer tube cavity, and a filter press is fixed at both ends of the outer tube cavity through flanges, and the bottom of the outer tube cavity is integrally formed with a lower convex portion; a filter tube core is fixed inside the outer tube cavity, and a liquid inlet and a slag discharge port connected to the filter tube core are respectively provided at the top and bottom of one end of the outer tube cavity; the liquid inlet and the slag discharge port are staggered; the filter press includes a sealing plate fixed to the flange, a hydraulic cylinder is fixed to the outside of the sealing plate, and a filter press piston is movably engaged with the inner side of both ends of the filter tube core; one of the filter press pistons is fixed to the piston rod of the hydraulic cylinder; a top pressure cylinder is provided between the other filter press piston and the other hydraulic cylinder; a rotating motor is fixed to the inner side of the top pressure cylinder, and the output shaft of the rotating motor is fixed to the filter press piston; a scraper is fixed to the end of the filter press piston away from the rotating motor, and the scraper is in contact with the inner wall of the filter tube core The top pressure cylinder is fixed with the piston rod of the hydraulic cylinder; when working, the slag discharge port is closed by the filter press piston, and then, the solid-liquid mixed ferrous fumarate is introduced into the filter tube core through the liquid inlet. After the feeding is completed, the filter press pushes the filter press piston to close the slag discharge port. Then, the filter press at the other end moves, and the hydraulic cylinder drives the filter press piston to approach the other filter press piston to compress the filtrate. After the compression is completed, the filtrate enters between the outer tube cavity and the filter tube core, and enters the lower convex part. Then, the filtrate on the inner side of the lower convex part is pressurized by the pressure pump through the liquid discharge port and sent to the filtrate filter for filtration; after the solid-liquid separation is completed, the filter press piston is separated from the slag discharge port, and the other filter press piston pushes the filter residue to the slag discharge port. Then, the rotary motor drives the filter press piston to rotate, and synchronously drives the scraper to scrape the material, so that the slag material is quickly discharged from the filter tube core from the slag discharge port.

[0014] Furthermore, expanded diameter pipe sections are provided at both ends of the filter tube core, and the expanded diameter pipe sections are tightly fixed to the inner wall of the outer tube cavity. The filter press piston can be introduced through the expanded diameter pipe section. At the same time, the expanded diameter pipe section abuts against the inner wall of the outer tube cavity, so that a gap can be formed between the filter tube core and the outer tube cavity, so that the filtrate can be quickly delivered to the liquid inlet; in addition, after the filtrate is filtered, the filter press piston is driven to enter the expanded diameter pipe section and disengage from the slag discharge port; the resistance of the rotating motor driving the filter press piston is smaller, and the scraper is used to scrape the inner wall of the filter tube core and the slag discharge port, so that the ferrous fumarate is quickly delivered to the drying unit.

[0015] Furthermore, the first to third powder feeders all include a screw feeder, a metering hopper is provided at the feeding end of the screw feeder, and a storage hopper is provided on the top of the metering hopper; when working, the raw materials in the storage hopper are fed into the metering hopper, and after being metered by the metering hopper, a certain amount of raw materials is fed into the first liquid dispensing tank or the second liquid dispensing tank through the screw feeder.

[0016] Furthermore, the drying unit comprises a wet material drying tube with a closed bottom, an emptying pipe is arranged at the top of the wet material drying tube, and a powder filter is arranged between the wet material drying tube and the emptying pipe; an array filter hole is arranged at the lower part of the wet material drying tube, and an outer sealing cover is arranged outside the array filter hole of the wet material drying tube; a screw feeder is arranged at the upper part of the wet material drying tube; a transition hopper is arranged between the screw feeder and the slag discharge port of the solid-liquid separation unit; a first rotary valve is arranged below the array filter hole of the wet material drying tube; a secondary dryer is arranged at the bottom of the first rotary valve of the wet material drying tube, and the secondary dryer comprises a hot air pressurization unit and a first pipe array, the hot air pressurization unit and the first pipe array are connected in series at both ends of the bottom of the wet material drying tube, and the output end of the first pipe array is connected to the first vacuum hopper; a second rotary valve is arranged at the bottom of the first vacuum hopper; the exhaust end of the first vacuum hopper is connected to the outer sealing cover through the return air pipe; the first pipe array It is composed of a plurality of tube bodies connected in series head to tail; a wind pressure pressurizing unit is connected in series on the return air duct; a screw feeder intermittently delivers the high-humidity ferrous fumarate in the transition hopper to the wet material drying tube; then, the hot air pressurizing unit can be used as hot air for drying the ferrous fumarate, and can also be used as pressure wind in the ferrous fumarate transmission process, and wind transmission is adopted to make the ferrous fumarate collide and transmit in the tube body of the first tube array, so that the hot air fully contacts the ferrous fumarate; the ferrous fumarate can be fully dried; the dried ferrous fumarate is delivered to the first vacuum hopper, so that it is stored inside the first vacuum hopper, and is rotated and discharged through the second rotary valve; the exhaust end of the first vacuum hopper pressurizes the return air through the wind pressure pressurizing unit, the pressure wind enters the outer cover, and disperses and preliminarily dries the high-humidity ferrous fumarate through the array filter holes, so that the moisture can be discharged through the powder filter, and the humid hot gas is discharged into the atmosphere or inside the water body through the exhaust pipe.

[0017] Furthermore, it also includes a tertiary dryer; the structure of the tertiary dryer is consistent with that of the secondary dryer; the input end of the tertiary dryer is connected to the output end of the second rotary valve; the wind pressure pressurization unit includes a pressure regulating air cylinder, the top of which is provided with an air inlet valve, and the bottom of the pressure regulating air cylinder is connected to the outer cover through a hot air pressurization unit; the return air ducts of the secondary dryer and the tertiary dryer are connected to the pressure regulating air cylinder; the second rotary valve serves as a discharge valve after the ferrous fumarate is dried; when the secondary drying is completed, it is further dried through the tertiary dryer again, so that online continuous drying can be realized, and during the drying process, It is able to deliver hot air with a certain amount of heat into the pressure-regulating air duct. At the initial stage of operation, the pressure-regulating air duct opens the air inlet valve, and the external air delivers the pressurized hot air into the outer cover through the hot air pressurization unit. The pressurized hot air continuously impacts the high-humidity ferrous fumarate in the wet material drying tube, so that the ferrous fumarate is loosened and preliminarily dried. When the secondary dryer and the tertiary dryer are working, the air inlet valve is closed, and the pressurized gas carrying a certain amount of residual heat and micropowder is delivered to the pressure-regulating air duct through the return air duct, and the air pressure pressurization unit is used for secondary temperature adjustment and pressurization, so that the micropowder contacts with the high-humidity ferrous fumarate, and the high-humidity ferrous fumarate is preliminarily air-dried.

[0018] Furthermore, the wind pressure pressurizing unit is a heat exchange hot air furnace.

[0019] A ferrous fumarate production process, using ferrous fumarate manufacturing equipment, the process is as follows:

[0020] The first step is to prepare the liquid. A certain amount of water is fed into the first liquid preparation tank through the first valve body, and the heating jacket is turned on. Then, a certain amount of fumaric acid is fed into the first liquid preparation tank through the first powder feeder, and the electric stirrer is used to continuously stir and decompose the liquid. After the decomposition is completed, the liquid is fed into the first synthesis reactor. After the first liquid preparation tank is emptied, a certain amount of water is fed into the first liquid preparation tank through the first valve body again, and the heating jacket is kept open. Then, a certain amount of sodium carbonate is fed into the first liquid preparation tank through the second powder feeder, and the electric stirrer is used to continuously stir and decompose the liquid. After the decomposition is completed, the liquid is fed into the horizontal storage tank. When the liquid level of the horizontal storage tank is lower than the set value, the liquid is prepared again through the first liquid preparation tank, otherwise the preparation process of the sodium carbonate solution is skipped each time the liquid is prepared. Then, the metering valve is opened. A sodium carbonate solution is added to the first synthesis reactor, and the solution is continuously stirred and the heating jacket is controlled to heat and keep warm; then, the pH value is collected in real time by an electronic pH meter, and the pH value of the first synthesis reactor and the metering valve are linked until the pH value of the first synthesis reactor reaches the set value; while the pH value of the first synthesis reactor is adjusted, a certain amount of water is fed into the second liquid preparation tank through the first valve body, and the heating jacket is turned on; then, a certain amount of ferrous sulfate heptahydrate is fed into the second liquid preparation tank through the third powder feeder, and the solution is continuously stirred and decomposed by an electric stirrer; after the decomposition is completed, the solution is fed into the first synthesis reactor for ferrous fumarate synthesis; when the first synthesis reactor is working, the first liquid preparation unit and the second liquid preparation unit prepare liquid for the second synthesis reactor; the synthesis process of the first synthesis reactor and the second synthesis reactor is performed alternately;

[0021] Preparation of ferrous fumarate: After the synthesis unit completes the synthesis of ferrous fumarate and cools it to the precipitation temperature of ferrous fumarate, it is sent to the solid-liquid separation unit, and the slag is sent to the drying unit through the solid-liquid separation unit. After drying, the finished ferrous fumarate product is obtained; the filtrate is sent to the filtrate filter, and the filtrate is sent to the water storage tank for reuse through the filtrate filter, and the sodium sulfate intercepted by the filtrate filter is concentrated and recovered.

[0022] Compared with the prior art, the ferrous fumarate production process and manufacturing equipment of the present invention adopt a first liquid preparation unit and a second liquid preparation unit to provide a reaction stock solution to a synthesis unit, and by alternately supplying liquid to a first synthesis reactor and a second synthesis reactor of the synthesis unit, the first synthesis reactor and the second synthesis reactor alternately synthesize ferrous fumarate, thereby realizing online continuous production of ferrous fumarate, having high production efficiency, and being able to prepare ferrous fumarate in a closed loop during the production process without generating waste discharge, thereby achieving good environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the overall structure of the ferrous fumarate manufacturing equipment of the present invention.

[0024] Figure 2 The figure is a schematic diagram of the installation structure of the ferrous fumarate manufacturing equipment and the evaporation pool of the present invention.

[0025] Figure 3 It is a schematic diagram of the overall structure of the solid-liquid separation unit of the present invention.

[0026] Figure 4 It is a schematic diagram of the overall structure of the filter tube core of the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of a drying unit composed of a wet material drying tube and a secondary dryer of the present invention.

[0028] Figure 6 It is a schematic diagram of the structure of a drying unit composed of a wet material drying tube, a secondary dryer and a tertiary dryer of the present invention.

[0029] Figure numerals: 1, water storage tank, 2, tap water inlet valve, 3, liquid return valve, 4, first liquid distribution tank, 5, first powder feeder, 6, second powder feeder, 7, first valve body, 8, second valve body, 9, third valve body, 10, second liquid distribution tank, 11, third powder feeder, 12, fourth valve body, 13, fifth valve body, 14, horizontal storage tank, 15, diverter pipe, 16, metering valve, 17, first synthesis reactor, 18, second synthesis reactor, 19, electronic pH meter, 20, first diverter valve, 21, second diverter valve, 22, pressure pump, 23, filtrate filter, 24, slag pump, 25, evaporation tank, 26, collection bin, 27, scraper paddle, 28, heat exchange chamber, 29, secondary temperature control tank, 30, supplementary heat valve, 31. Circulation pump, 32. Sixth valve body, 33. Seventh valve body, 34. First temperature regulating tank, 35. Evaporation fan, 36. Backflush valve, 37. Outer tube cavity, 38. Lower convex part, 39. Filter tube core, 40. Hydraulic cylinder, 41. Filter press piston, 42. Top pressure cylinder, 43. Rotating motor, 44. Scraper, 45. Expanded diameter pipe section, 46. Screw feeder, 47. Measuring hopper, 48. Storage hopper, 49. Wet material drying pipe, 50. Emptying pipe, 51. Powder filter, 52. Outer cover, 53. Screw feeder, 54. First rotary valve, 55. Hot air pressurizing unit, 56. First tube array, 57. First vacuum hopper, 58. Second rotary valve, 59. Return air pipe, 60. Pressure regulating air cylinder, 61. Air intake valve. DETAILED DESCRIPTION

[0030] Example:

[0031] like Figures 1 to 6 The ferrous fumarate production process and manufacturing equipment shown include:

[0032] A water storage tank 1, wherein the water storage tank 1 is provided with a tap water inlet valve 2 and a liquid return valve 3;

[0033] A first liquid dispensing unit, the first liquid dispensing unit comprises a first liquid dispensing tank 4, the first liquid dispensing tank 4 is provided with a heating jacket on the outside, an electric stirrer, a first powder feeder 5 and a second powder feeder 6 are provided on the top of the first liquid dispensing tank 4; the bottom of the water storage tank 1 is connected to the top of the first liquid dispensing tank 4 through a first valve body 7; the bottom of the first liquid dispensing tank 4 is connected to a second valve body 8 and a third valve body 9;

[0034] A second liquid dispensing unit, the second liquid dispensing unit comprises a second liquid dispensing tank 10, the second liquid dispensing tank 10 is provided with a heating jacket on the outside, an electric stirrer and a third powder feeder 11 are provided on the top of the second liquid dispensing tank 10; the bottom of the water storage tank 1 is connected to the top of the second liquid dispensing tank 10 through a fourth valve body 12; a fifth valve body 13 is provided at the bottom of the second liquid dispensing tank 10;

[0035] A horizontal storage tank 14, wherein a heating jacket is disposed outside the horizontal storage tank 14; the temperature of the horizontal storage tank 14 can be controlled by the heating jacket, so that the sodium carbonate solution in the horizontal storage tank 14 is kept warm, and the sodium carbonate solution is prevented from causing temperature fluctuations to the solution in the synthesis unit after entering the synthesis unit; the second valve body 8 is connected to the horizontal storage tank 14; the third valve body 9 and the fifth valve body 13 are connected to the shunt pipe 15; the bottom of the horizontal storage tank 14 is connected to the shunt pipe 15 through a metering valve 16;

[0036] A synthesis unit, the synthesis unit comprises a first synthesis reactor 17 and a second synthesis reactor 18, the first synthesis reactor 17 and the second synthesis reactor 18 are both provided with heating jackets on their exteriors; an electric stirrer and an electronic pH meter 19 are provided on the tops of the first synthesis reactor 17 and the second synthesis reactor 18; a first diverter valve 20 and a second diverter valve 21 are connected to the bottom of the diverter pipe 15; the other ends of the first diverter valve 20 and the second diverter valve 21 are connected to the first synthesis reactor 17 and the second synthesis reactor 18;

[0037] Solid-liquid separation unit, the first synthesis reactor 17 and the second synthesis reactor 18 are respectively connected to the solid-liquid separation unit through bottom valves; the slag discharge port of the solid-liquid separation unit is connected to the drying unit; the liquid discharge port of the solid-liquid separation unit is connected to the filtrate filter through the pressure pump 22; the filtrate filter is connected to the buffer tank, and the buffer tank is connected to the liquid return valve 3 through the liquid return pump.

[0038] A first temperature regulating tank 34 is provided between the solid-liquid separation unit and the filtrate filter, and the bottom of the first temperature regulating tank 34 is connected to the filtrate filter 23 through a pressure pump 22; the waste discharge end of the filtrate filter 23 is connected to a slag pump 24 through a waste discharge valve, and the slag pump 24 is connected to an evaporation pool 25; a slag discharge port is provided at the upper part of one side of the evaporation pool 25; a collection bin 26 is provided outside the slag discharge port, and a wall scraper 27 driven by a motor is provided inside the evaporation pool 25; a heat exchange chamber 28 is provided at the bottom of the evaporation pool 25 The liquid inlet end of the heat exchange chamber 28 is connected to the secondary temperature control tank 29; the secondary temperature control tank 29 is connected to the supplementary heat valve 30, and the liquid discharge end of the heat exchange chamber 28 is connected to the sixth valve body 32 and the seventh valve body 33 through the circulation pump 31, and the sixth valve body 32 is connected to the secondary temperature control tank 29; the seventh valve body 33 is connected to the first temperature regulating tank 34; an evaporation fan 35 is arranged on the top of the evaporation pool 25; a backflush valve 36 is connected between the liquid return pump and the liquid return valve 3, and the backflush valve 36 is connected to the flushing end of the filtrate filter 23.

[0039] During operation, the first temperature regulating tank 34 performs secondary cooling on the filtrate to allow sodium sulfate to be fully precipitated. Then, the first temperature regulating tank 34 pressurizes the mixed liquid into the filtrate filter 23 through the pressure pump 22. The filtrate is pressurized and filtered through the filtrate filter 23, and the filtrate is sent to the buffer tank and sent to the water storage tank 1 through the liquid return pump and the liquid return valve 3; wait for the filtrate to be reused for the second time; when the filtrate filter 23 works for the set time, the pressure pump 22 is closed, the liquid return valve 3 is closed, and the backwash valve 36 is opened. The filtrate in the buffer tank is pressurized and pumped into the filtrate filter 23 through the liquid return pump and the backwash valve 36; then, the backwashed solid-liquid mixed liquid is sent to the evaporation tank 25 through the slag pump 24; at the same time, the first temperature regulating tank 34 pumps the filtrate into the secondary temperature control tank 29 through the supplementary heat valve 30, so that the filtrate is reduced to the set temperature for the second time, The filtrate is pumped into the heat exchange chamber 28, and then the filtrate that has completed the heat exchange is pumped into the secondary temperature control tank 29 through the sixth valve body 32 through the circulation pump 31. When the secondary temperature control tank 29 drops to the lower temperature limit, the sixth valve body 32 is closed, and the supplementary heat valve 30 and the seventh valve body 33 are opened; when the temperature of the secondary temperature control tank 29 reaches the upper temperature limit, the supplementary heat valve 30 and the seventh valve body 33 are closed again, and the sixth valve body 32 is opened again to continuously provide the evaporation temperature to the bottom of the evaporation pool 25. During evaporation, the evaporation fan 35 is turned on to increase the evaporation rate of water; after evaporation is completed, the motor drives the scraper paddle 27 to scrape the sodium sulfate into the slag discharge port and store it in the collecting bin 26. After scraping, the slag pump 24 can be turned on again to send the backwashed solid-liquid mixture into the evaporation pool 25 through the slag pump 24.

[0040] The solid-liquid separation unit includes an outer tube cavity 37, and filter presses are fixed at both ends of the outer tube cavity 37 through flanges, and a lower convex portion 38 is integrally formed at the bottom of the outer tube cavity 37; a filter tube core 39 is fixed inside the outer tube cavity 37, and a liquid inlet and a slag discharge port connected to the filter tube core 39 are respectively provided at the top and bottom of one end of the outer tube cavity 37; the liquid inlet and the slag discharge port are staggered; the filter press includes a sealing plate fixed to the flange, a hydraulic cylinder 40 is fixed to the outside of the sealing plate, and filter press pistons 41 are movably engaged on the inner sides of both ends of the filter tube core 39; one of the filter press pistons 41 is fixed to the piston rod of the hydraulic cylinder 40; a top pressure cylinder 42 is arranged between the other filter press piston 41 and the other hydraulic cylinder 40; a rotating motor 43 is fixed to the inner side of the top pressure cylinder 42, and the output shaft of the rotating motor 43 is fixed to the filter press piston 41; a scraper 44 is fixed to the end of the filter press piston 41 away from the rotating motor 43, and the scraper 44 is engaged with the inner side of the filter tube core 39 The top pressure cylinder 42 is fixed to the piston rod of the hydraulic cylinder 40; when working, the slag discharge port is closed by the filter press piston 41, and then the solid-liquid mixed ferrous fumarate is introduced into the filter tube core 39 through the liquid inlet. After the feeding is completed, the filter press pushes the filter press piston 41 to close the slag discharge port. Then, the filter press at the other end is actuated, and the hydraulic cylinder 40 drives the filter press piston 41 to approach another filter press piston 41 to compress the filtrate. After the compression is completed, the filtrate enters the outer tube The filter press piston 41 passes through the cavity 37 and the filter tube core 39 and enters the lower convex portion 38. Then, the filtrate on the inner side of the lower convex portion 38 is pressurized by the pressure pump 22 through the discharge port and sent to the filtrate filter 23 for filtration. After the solid-liquid separation is completed, the filter press piston 41 is separated from the slag discharge port, and another filter press piston 41 pushes the filter residue to the slag discharge port. Then, the rotating motor 43 drives the filter press piston 41 to rotate and simultaneously drives the scraper 44 to scrape the material, so that the slag material is quickly discharged from the slag discharge port to the filter tube core 39.

[0041] The two ends of the filter tube core 39 are connected with an expanded diameter pipe section 45, and the expanded diameter pipe section 45 is tightly fixed to the inner wall of the outer tube cavity 37. The filter press piston 41 can be introduced through the expanded diameter pipe section 45. At the same time, the expanded diameter pipe section 45 abuts against the inner wall of the outer tube cavity 37, so that a gap can be formed between the filter tube core 39 and the outer tube cavity 37, so that the filtrate can be quickly delivered to the liquid inlet; in addition, after the filtrate is filtered, the filter press piston 41 is driven to enter the expanded diameter pipe section 45 and leave the slag discharge port; the rotating motor 43 drives the filter press piston 41 with less resistance, and the scraper 44 is used to scrape the inner wall of the filter tube core 39 and the slag discharge port, so that the ferrous fumarate is quickly delivered to the drying unit.

[0042] The first powder feeder 5 to the third powder feeder 11 all include a screw feeder 46, a metering hopper 47 is provided at the feeding end of the screw feeder 46, and a storage hopper 48 is provided on the top of the metering hopper 47; when working, the raw materials in the storage hopper 48 are fed into the metering hopper 47, and after being metered by the metering hopper 47, the quantitative raw materials are fed into the first liquid dispensing tank 4 or the second liquid dispensing tank 10 through the screw feeder 46.

[0043] The drying unit comprises a wet material drying pipe 49 with a closed bottom, an emptying pipe 50 is arranged on the top of the wet material drying pipe 49, and a powder filter screen 51 is arranged between the wet material drying pipe 49 and the emptying pipe 50; an array filter hole is arranged at the bottom of the wet material drying pipe 49, and an outer sealing cover 52 is arranged outside the array filter hole of the wet material drying pipe 49; a screw feeder 53 is arranged on the top of the wet material drying pipe 49; a transition hopper is arranged between the screw feeder 53 and the slag discharge port of the solid-liquid separation unit; the wet material drying pipe 49 is provided with a first rotary valve 54 below the array filter holes; the wet material drying pipe 49 is provided with a secondary dryer at the bottom of the first rotary valve 54, the secondary dryer includes a hot air pressurizing unit 55 and a first tube array 56, the hot air pressurizing unit 55 and the first tube array 56 are connected in series at both ends of the bottom of the wet material drying pipe 49, and the output end of the first tube array 56 is connected to the first vacuum hopper 57; the bottom of the first vacuum hopper 57 is provided with a second rotary valve 58; the exhaust end of the first vacuum hopper 57 is connected to the return air pipe 59 The outer cover 52; the first tube row 56 is composed of a plurality of tube bodies connected in series head to tail; the return air duct 59 is connected in series with a wind pressure pressurizing unit; the screw feeder 53 intermittently feeds the high-humidity ferrous fumarate in the transition hopper into the wet material drying tube 49; then, the hot air pressurizing unit 55 can be used as hot air for drying the ferrous fumarate, and can also be used as pressure wind in the ferrous fumarate transmission process, using wind transmission to make the ferrous fumarate collide and transmit in the tube body of the first tube row 56, so that the hot air fully contacts the ferrous fumarate; it can The ferrous fumarate is fully dried; the dried ferrous fumarate is sent to the first vacuum hopper 57, thereby being stored inside the first vacuum hopper 57, and is rotated and discharged through the second rotary valve 58; the exhaust end of the first vacuum hopper 57 pressurizes the return air through the wind pressure pressurization unit, and the pressure wind enters the outer cover 52, and disperses and preliminarily dries the high-humidity ferrous fumarate through the array filter holes, so that the moisture can be discharged through the powder filter 51, and the humid hot gas is discharged into the atmosphere or the inside of the water body through the exhaust pipe 50.

[0044] It also includes a tertiary dryer; the structure of the tertiary dryer is consistent with that of the secondary dryer; the input end of the tertiary dryer is connected to the output end of the second rotary valve 58; the wind pressure pressurization unit includes a pressure regulating air cylinder 60, the top of which is provided with an air intake valve 61, and the bottom of the pressure regulating air cylinder 60 is connected to the outer cover 52 through the hot air pressurization unit 55; the return air duct 59 of the secondary dryer and the tertiary dryer is connected to the pressure regulating air cylinder 60; the second rotary valve 58 serves as a discharge valve after the ferrous fumarate is dried; after the secondary drying is completed, the tertiary dryer is used for further drying again, so that online continuous drying can be realized, and during the drying process, the Hot air with a certain amount of heat is sent to the pressure regulating air duct 60. At the initial stage of operation, the air inlet valve 61 of the pressure regulating air duct 60 is opened, and the external air sends the pressurized hot air into the outer cover 52 through the hot air pressurization unit 55. The pressurized hot air continuously impacts the high-humidity ferrous fumarate in the wet material drying tube 49, so that the ferrous fumarate is loosened and preliminarily dried. When the secondary dryer and the tertiary dryer are working, the air inlet valve 61 is closed, and the pressurized gas carrying a certain amount of residual heat and micropowder is sent to the pressure regulating air duct 60 through the return air duct 59, and the secondary temperature adjustment and pressurization are performed through the wind pressure pressurization unit, so that the micropowder contacts with the high-humidity ferrous fumarate, and the high-humidity ferrous fumarate is preliminarily air-dried.

[0045] The wind pressure pressurizing unit is a heat exchange hot air furnace.

[0046] A ferrous fumarate production process, using ferrous fumarate manufacturing equipment, the process is as follows:

[0047] The first step is to prepare the liquid. A certain amount of water is fed into the first liquid preparation tank 4 through the first valve body 7, and the heating jacket is turned on. Then, a certain amount of fumaric acid is fed into the first liquid preparation tank 4 through the first powder feeder 5, and the mixture is continuously stirred and decomposed by an electric stirrer. After the decomposition is completed, the mixture is sent to the first synthesis reactor 17. After the first liquid preparation tank 4 is emptied, a certain amount of water is fed into the first liquid preparation tank 4 again through the first valve body 7, and the heating jacket is kept open. Then, a certain amount of sodium carbonate is fed into the first liquid preparation tank 4 through the second powder feeder 6, and the mixture is continuously stirred and decomposed by an electric stirrer. After the decomposition is completed, the mixture is sent to the horizontal storage tank 14. When the liquid level of the horizontal storage tank 14 is lower than the set value, the liquid is prepared again through the first liquid preparation tank 4, otherwise the preparation process of the sodium carbonate solution is skipped each time the liquid is prepared. Then, the metering valve 16 is opened to feed the first synthesis reactor. Sodium carbonate solution is added into 17, and stirring is continued and the heating jacket is controlled to heat and keep warm; then, the pH value is collected in real time by the electronic pH meter 19, so that the pH value of the first synthesis reactor 17 and the metering valve 16 are linked until the pH value of the first synthesis reactor 17 reaches the set value; while the pH value of the first synthesis reactor 17 is adjusted, a certain amount of water is sent to the second liquid distribution tank 10 through the first valve body 7, and the heating jacket is turned on, then a certain amount of ferrous sulfate heptahydrate is sent to the second liquid distribution tank 10 through the third powder feeder 11, and the electric stirrer is continuously stirred and decomposed; after the decomposition is completed, it is sent to the first synthesis reactor 17 for ferrous fumarate synthesis; when the first synthesis reactor 17 is working, the first liquid distribution unit and the second liquid distribution unit distribute liquid to the second synthesis reactor 18; the synthesis process of the first synthesis reactor 17 and the second synthesis reactor 18 is carried out alternately;

[0048] Preparation of ferrous fumarate: After the synthesis unit completes the synthesis of ferrous fumarate and cools it to the precipitation temperature of ferrous fumarate, it is sent to the solid-liquid separation unit, and the slag is sent to the drying unit through the solid-liquid separation unit, and the finished ferrous fumarate product is obtained after drying; the filtrate is sent to the filtrate filter 23, and the filtrate is sent to the water storage tank 1 for reuse through the filtrate filter 23, and the sodium sulfate intercepted by the filtrate filter 23 is concentrated and recovered.

[0049] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. A ferrous fumarate manufacturing equipment, characterized in that: include A water storage tank, wherein the water storage tank is provided with a tap water inlet valve and a liquid return valve; A first liquid dispensing unit, the first liquid dispensing unit comprises a first liquid dispensing tank, a heating jacket is arranged outside the first liquid dispensing tank, an electric stirrer, a first powder feeder and a second powder feeder are arranged on the top of the first liquid dispensing tank; the bottom of the water storage tank is connected to the top of the first liquid dispensing tank through a first valve body; the bottom of the first liquid dispensing tank is connected to a second valve body and a third valve body; A second liquid dispensing unit, the second liquid dispensing unit comprises a second liquid dispensing tank, a heating jacket is arranged outside the second liquid dispensing tank, an electric stirrer and a third powder feeder are arranged on the top of the second liquid dispensing tank; the bottom of the water storage tank is connected to the top of the second liquid dispensing tank through a fourth valve body; a fifth valve body is arranged at the bottom of the second liquid dispensing tank; A horizontal storage tank, wherein a heating jacket is disposed outside the horizontal storage tank; the second valve body is connected to the horizontal storage tank; the third valve body and the fifth valve body are connected to the shunt pipe; the bottom of the horizontal storage tank is connected to the shunt pipe through a metering valve; A synthesis unit, the synthesis unit comprising a first synthesis kettle and a second synthesis kettle, the first synthesis kettle and the second synthesis kettle are both provided with heating jackets on the outside; an electric stirrer and an electronic pH meter are provided on the top of the first synthesis kettle and the second synthesis kettle; a first diverter valve and a second diverter valve are connected to the bottom of the diverter pipe; the other ends of the first diverter valve and the second diverter valve are connected to the first synthesis kettle and the second synthesis kettle; A solid-liquid separation unit, wherein the first synthesis reactor and the second synthesis reactor are respectively connected to the solid-liquid separation unit through bottom valves; The slag discharge port of the solid-liquid separation unit is connected to the drying unit; the liquid discharge port of the solid-liquid separation unit is connected to the filtrate filter through a pressure pump; the filtrate filter is connected to a buffer tank, and the buffer tank is connected to a liquid return valve through a liquid return pump; A first temperature regulating tank is arranged between the solid-liquid separation unit and the filtrate filter, and the bottom of the first temperature regulating tank is connected to the filtrate filter through a pressure pump; the waste discharge end of the filtrate filter is connected to a slag pump through a waste discharge valve, and the slag pump is connected to an evaporation tank; a slag discharge port is arranged on the upper part of one side of the evaporation tank; a collecting bin is arranged outside the slag discharge port, and a scraper paddle driven by a motor is arranged inside the evaporation tank; a heat exchange chamber is arranged at the bottom of the evaporation tank, and the liquid inlet end of the heat exchange chamber is connected to a secondary temperature control tank; the secondary temperature control tank is connected to a supplementary heat valve, and the liquid discharge end of the heat exchange chamber is connected to a sixth valve body and a seventh valve body through a circulating pump, and the sixth valve body is connected to the secondary temperature control tank; the seventh valve body is connected to the first temperature regulating tank; an evaporation fan is arranged on the top of the evaporation tank; a recoil valve is connected between the return liquid pump and the return liquid valve, and the recoil valve is connected to the flushing end of the filtrate filter.

2. Ferrous fumarate manufacturing equipment according to claim 1, characterized in that: The solid-liquid separation unit includes an outer tube cavity, and filter presses are fixed at both ends of the outer tube cavity through flanges, and the bottom of the outer tube cavity is integrally formed with a lower convex portion; a filter tube core is fixed inside the outer tube cavity, and a liquid inlet and a slag discharge port connected to the filter tube core are respectively provided at the top and bottom of one end of the outer tube cavity; the liquid inlet and the slag discharge port are staggered; the filter press includes a sealing plate fixed to the flange, a hydraulic cylinder is fixed to the outside of the sealing plate, and filter press pistons are movably engaged on the inner sides of both ends of the filter tube core; one of the filter press pistons is fixed to the piston rod of the hydraulic cylinder; a top pressure cylinder is provided between the other filter press piston and the other hydraulic cylinder; a rotating motor is fixed to the inner side of the top pressure cylinder, and the output shaft of the rotating motor is fixed to the filter press piston; a scraper is fixed to the end of the filter press piston away from the rotating motor, and the scraper is in contact with the inner wall of the filter tube core; the top pressure cylinder is fixed to the piston rod of the hydraulic cylinder.

3. Ferrous fumarate manufacturing equipment according to claim 2, characterized in that: The two communicating ends of the filter tube core are provided with enlarged diameter tube sections, and the enlarged diameter tube sections are tightly fixed to the inner wall of the outer tube cavity.

4. The ferrous fumarate manufacturing equipment according to claim 1, wherein: The first to third powder feeders all include a screw feeder, a metering hopper is provided at a feeding end of the screw feeder, and a storage hopper is provided at the top of the metering hopper.

5. The ferrous fumarate manufacturing equipment according to claim 1, wherein: The drying unit comprises a wet material drying tube with a closed bottom, an emptying pipe is arranged at the top of the wet material drying tube, and a powder filter is arranged between the wet material drying tube and the emptying pipe; an array filter hole is arranged at the lower part of the wet material drying tube, and an outer sealing cover is arranged outside the array filter hole of the wet material drying tube; a screw feeder is arranged at the upper part of the wet material drying tube; a transition hopper is arranged between the screw feeder and the slag discharge port of the solid-liquid separation unit; a first rotary valve is arranged below the array filter hole of the wet material drying tube; a secondary dryer is arranged at the bottom of the first rotary valve of the wet material drying tube, and the secondary dryer comprises a hot air pressurizing unit and a first pipe array, the hot air pressurizing unit and the first pipe array are connected in series at both ends of the bottom of the wet material drying tube, and the output end of the first pipe array is connected to the first vacuum hopper; a second rotary valve is arranged at the bottom of the first vacuum hopper; the exhaust end of the first vacuum hopper is connected to the outer sealing cover through the return air duct; the first pipe array is composed of a plurality of pipe bodies connected in series head to tail; and a wind pressure pressurizing unit is connected in series to the return air duct.

6. The ferrous fumarate manufacturing equipment according to claim 5, characterized in that: It also includes a tertiary dryer; the structure of the tertiary dryer is consistent with that of the secondary dryer; the input end of the tertiary dryer is connected to the output end of the second rotary valve; the wind pressure pressurizing unit includes a pressure regulating air cylinder, the top of the pressure regulating air cylinder is provided with an air intake valve, and the bottom of the pressure regulating air cylinder is connected to the outer cover through the hot air pressurizing unit; the return air ducts of the secondary dryer and the tertiary dryer are connected to the pressure regulating air cylinder.

7. The ferrous fumarate manufacturing equipment according to claim 5 or 6, characterized in that: The wind pressure pressurizing unit is a heat exchange hot air furnace.

8. A process for producing ferrous fumarate, using the ferrous fumarate manufacturing equipment described in any one of claims 1 to 6, characterized in that: The process is specifically as follows: The first step is to prepare the liquid. A certain amount of water is fed into the first liquid preparation tank through the first valve body, and the heating jacket is turned on. Then, a certain amount of fumaric acid is fed into the first liquid preparation tank through the first powder feeder, and the electric stirrer is used to continuously stir and decompose the liquid. After the decomposition is completed, the liquid is fed into the first synthesis reactor. After the first liquid preparation tank is emptied, a certain amount of water is fed into the first liquid preparation tank through the first valve body again, and the heating jacket is kept open. Then, a certain amount of sodium carbonate is fed into the first liquid preparation tank through the second powder feeder, and the electric stirrer is used to continuously stir and decompose the liquid. After the decomposition is completed, the liquid is fed into the horizontal storage tank. When the liquid level of the horizontal storage tank is lower than the set value, the liquid is prepared again through the first liquid preparation tank, otherwise the preparation process of the sodium carbonate solution is skipped each time the liquid is prepared. Then, the metering valve is opened. A sodium carbonate solution is added to the first synthesis reactor, and the solution is continuously stirred and the heating jacket is controlled to heat and keep warm; then, the pH value is collected in real time by an electronic pH meter, and the pH value of the first synthesis reactor and the metering valve are linked until the pH value of the first synthesis reactor reaches the set value; while the pH value of the first synthesis reactor is adjusted, a certain amount of water is fed into the second liquid preparation tank through the first valve body, and the heating jacket is turned on; then, a certain amount of ferrous sulfate heptahydrate is fed into the second liquid preparation tank through the third powder feeder, and the solution is continuously stirred and decomposed by an electric stirrer; after the decomposition is completed, the solution is fed into the first synthesis reactor for ferrous fumarate synthesis; when the first synthesis reactor is working, the first liquid preparation unit and the second liquid preparation unit prepare liquid for the second synthesis reactor; the synthesis process of the first synthesis reactor and the second synthesis reactor is performed alternately; Preparation of ferrous fumarate: After the synthesis unit completes the synthesis of ferrous fumarate and cools it to the precipitation temperature of ferrous fumarate, it is sent to the solid-liquid separation unit, and the slag is sent to the drying unit through the solid-liquid separation unit. After drying, the finished ferrous fumarate product is obtained; the filtrate is sent to the filtrate filter, and the filtrate is sent to the water storage tank for reuse through the filtrate filter, and the sodium sulfate intercepted by the filtrate filter is concentrated and recovered.

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