Process and apparatus for producing phosphorus ammonium

Abstract

The present application relates to the technical field of ammonium phosphate production, and discloses a kind of ammonium phosphate production process, its steps are: S1: using dry method ball mill to phosphorite is ground, and the fineness of 150 mesh, the water content of 5% phosphorite powder is prepared;S2: the above-mentioned phosphorite powder is added to extraction tank, and the concentration of 85% sulfuric acid is added according to the weight ratio of phosphorite powder and sulfuric acid 1:0.95, the reaction temperature is 75-95 DEG C, the reaction time is 3-4 hours, and the extraction slurry is obtained, the liquid-solid ratio of intermediate extraction slurry is 2.5-3.0:1;S3: the above-mentioned extraction slurry is filtered by vacuum filter and the wet extraction dilute phosphoric acid is obtained, and the dilute phosphoric acid is sequentially used in gas ammonia neutralizing device, concentration device, shotcrete granulation device and screening device to prepare phosphorus ammonium.The production process can reduce the production cost of ammonium phosphate, and the shotcrete granulation device in the production process can obviously improve the granulation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphorus ammonium production, in particular to a phosphorus ammonium production process and equipment. BACKGROUND

[0002] Phosphorus ammonium is a conventional compound fertilizer, and has a wide range of uses. The existing Chinese patent with the patent name of "Method for preparing phosphorus ammonium" and the patent number of "CN103539487B" discloses a phosphorus ammonium production process. The use of the equipment can significantly reduce the cost. However, in the process of spray granulation, it is found that the particle size of the fertilizer particles manufactured by using the existing spray granulation equipment is quite different. This is because the particles formed after the drying of the slurry are accumulated together in the process of spray granulation. Through the rotation of the roller, the particles are slowly formed. The accumulated slurry cannot be well spread and combined with other slurry to form particles. In order to improve the effect of granulation, a new granulation equipment is needed. SUMMARY

[0003] The purpose of the present application is to provide a phosphorus ammonium production process and equipment, which has the effect of good phosphorus ammonium production and granulation.

[0004] The above technical purpose of the present application is realized by the following technical scheme: a phosphorus ammonium production process, characterized in that the steps are: S1: using a dry ball mill to grind phosphate ore to obtain phosphate powder with a fineness of 150 mesh and a water content of 5%; S2: adding the phosphate powder into an extraction tank, adding sulfuric acid with a concentration of 85% according to the weight ratio of phosphate powder to sulfuric acid of 1:0.95, the reaction temperature is 75-95 DEG C, the reaction time is 3-4 hours, and the intermediate extraction slurry is obtained, the liquid-solid ratio of the intermediate extraction slurry is 2.5-3.0:1; S3: filtering the extraction slurry through a vacuum filter to obtain wet extraction dilute phosphoric acid, and using a gas ammonia neutralization device, a concentration device, a spray granulation device and a screening device in sequence to prepare phosphorus ammonium from the dilute phosphoric acid.

[0005] As a further arrangement of the present application, the jet granulation device comprises a frame and a barrel, the frame is provided with a power assembly driving the barrel to rotate, the axis of the barrel is horizontally placed, the barrel comprises a throwing barrel section located near the side of the feed inlet, the inner wall of the throwing barrel section is provided with a plurality of baffles along the length direction, the plurality of baffles are uniformly and spacedly arranged, the end of the baffle is fixedly connected with a support plate, the both sides of the throwing barrel section are provided with side plates, the side plates, the baffles and the support plates form a storage space, a certain feed gap is arranged between adjacent storage spaces, the feed gap is provided with a feed assembly feeding the storage space, a plurality of discharge ports are formed in the support plate, the discharge ports are provided with throwing plates, the throwing plates can completely close the discharge ports, the throwing plates are connected with push rods, the axis of the push rod is arranged along the radial direction of the barrel section, the outer side of the barrel section is provided with a pushing assembly, when the push rod is rotated to be above the barrel section, the pushing assembly pushes the push rod to move downward.

[0006] By adopting the above technical scheme, during work, slurry is conveyed into the barrel, the high temperature inside the barrel volatilizes the liquid, the slurry in the slurry becomes solid powder, after enrichment of the solid powder, the solid powder enters the throwing barrel section, the solid powder enters the feed gap, the feed assembly in the feed gap pushes the solid powder into the storage space, and then rotates together with the barrel, after rotating to a high place, the pushing assembly pushes the push rod to move downward, then the push rod drives the throwing plate to move downward, so that the throwing plate opens the discharge port, the solid powder is thrown downward through the throwing plate, and is combined with the slurry that has not been volatilized inside the barrel, when the liquid is completely volatilized, the granular fertilizer is formed, by this throwing mode, it can be ensured that the powder in the barrel will not be excessively accumulated to cause too large difference in particle size of the fertilizer.

[0007] As a further arrangement of the present application, the feed assembly comprises a rotating rod located in the feed space, the rotating rod is rotationally connected with the side plate, the side of the rotating rod is provided with a plurality of feed plates, when the barrel rotates, the rotating rod rotates at the same time.

[0008] As a further arrangement of the present application, the side of the rotating rod is coaxially and fixedly connected with a gear one, the frame is fixedly provided with an internal gear, the gear one is engaged with the internal gear.

[0009] By adopting the technical scheme, the rotating rod rotates with the cylinder under the action of the cylinder, at the same time, the gear one rotates on the internal gear, so that the gear one rotates, the gear one drives the rotating rod to rotate relative to the cylinder, when the rotating rod rotates, the rotating rod drives the feeding plate to rotate, when the solid powder enters the throwing cylinder segment, the solid powder enters the feeding gap first, when the rotating rod drives the feeding plate to rotate, the solid powder is pushed into the discharging space, rotates upward together with the cylinder, when rotating to the top of the cylinder, the pushing rod pushes the throwing disc to open the discharging port, under the action of gravity, the solid powder falls from the discharging port, under the action of the throwing disc, the solid powder can be more dispersedly thrown in the air, so that the solid powder is more easily combined with other powders, and the problem that the solid powder excessively accumulates to cause uneven fertilizer particle size is avoided.

[0010] As a further arrangement of the present application, the pushing assembly comprises a pushing cylinder fixedly connected with the rack, a pushing block is fixedly arranged at the top of the pushing cylinder, the inner wall of the pushing cylinder is arc-shaped except the pushing block, a spring is sleeved on the pushing rod, one end of the spring is fixedly connected with the outer wall of the throwing cylinder segment, and the other end is fixedly connected with the pushing rod, the pushing rod abuts against the inner wall of the pushing cylinder, and the pushing rod is located on the arc-shaped cylinder wall of the pushing cylinder.

[0011] By adopting the technical effect, the cylinder drives the pushing rod to rotate together, the outer end of the pushing rod slides in the pushing cylinder, when sliding to the part provided with the pushing block, the pushing rod is compressed, so that the pushing rod drives the throwing plate to open the discharging port.

[0012] The present application has the following beneficial effects:

[0013] The present application creatively adds the throwing segment in the spray granulation equipment, can throw the solid powder, thereby greatly reducing the problem that the solid powder excessively accumulates to cause uneven fertilizer particle size, in the throwing process, without increasing additional power equipment, feeding and throwing can be realized through the rotation of the spray granulation equipment itself, and the present application is very convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0015] Figure 1 It is a whole structure schematic view of the present embodiment;

[0016] Figure 2 It is an external structure schematic view of the throwing cylinder segment of the present embodiment;

[0017] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure;

[0018] Figure 4 This is a schematic diagram of the internal structure of the spraying cylinder section in this embodiment;

[0019] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure;

[0020] Figure 6 yes Figure 4 A schematic diagram of the cross-sectional structure;

[0021] Figure 7 A schematic diagram of the push rod structure in this embodiment;

[0022] In the diagram, 1. Frame, 2. Cylinder, 21. Spraying section, 3. Storage space, 31. Baffle, 32. Support plate, 321. Discharge port, 322. Spraying plate, 33. Side plate, 4. Feed gap, 5. Feeding assembly, 51. Rotating rod, 52. Feeding plate, 53. Gear 1, 54. Internal gear, 6. Push rod, 7. Pushing assembly, 71. Pushing cylinder, 72. Pushing block, 73. Spring. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Example

[0025] A process for producing ammonium phosphate, characterized by the following steps: S1: Grinding phosphate rock using a dry ball mill to obtain phosphate rock powder with a fineness of 150 mesh and a moisture content of 5%; S2: Adding the above phosphate rock powder to an extraction tank, adding sulfuric acid with a concentration of 85% at a weight ratio of phosphate rock powder to sulfuric acid of 1:0.95, reacting at a temperature of 75-95℃ for 3-4 hours to obtain an extraction slurry, wherein the liquid-to-solid ratio of the intermediate extraction slurry is 2.5-3.0:1; S3: Filtering the above extraction slurry through a vacuum filter to obtain wet-process extracted dilute phosphoric acid, which is then processed sequentially using an ammonia neutralization device, a concentration device, a spray granulation device, and a screening device to produce ammonium phosphate.

[0026] As a further arrangement of the present application, the jet granulation device comprises a frame 1 and a barrel 2, the frame 1 is provided with a power assembly for driving the barrel 2 to rotate, the axis of the barrel 2 is horizontally arranged, the barrel 2 comprises a throwing barrel section 21 located at one side close to the feeding port, a plurality of baffles 31 are arranged on the inner wall of the throwing barrel section 21 along the length direction, the plurality of baffles 31 are uniformly and spacedly arranged, the end of each baffle 31 is fixedly connected with a support plate 32, side plates 33 are arranged on both sides of the throwing barrel section 21, the side plates 33, the baffles 31 and the support plates 32 form a storage space 3, a certain feeding gap 4 is arranged between adjacent storage spaces 3, a feeding assembly 5 for feeding the storage space 3 is arranged in the feeding gap 4, a plurality of discharge ports 321 are formed in the support plates 32, a throwing plate 322 is arranged at each discharge port 321, the throwing plate 322 can completely close the discharge port 321, the throwing plate 322 is connected with a push rod 6, the axis of the push rod 6 is arranged along the radial direction of the barrel section, a pushing assembly 7 is arranged outside the barrel section, when the push rod 6 rotates to be located above the barrel section, the pushing assembly 7 pushes the push rod 6 to move downward.

[0027] In operation, slurry is fed into the barrel 2, the high temperature inside the barrel 2 volatilizes the liquid, the slurry in the slurry becomes solid powder, after the solid powder is enriched, it enters the throwing barrel section 21, the solid powder enters the feeding gap 4, the feeding assembly 5 in the feeding gap 4 pushes the solid powder into the storage space 3, and then rotates together with the barrel 2, after rotating to a high position, the pushing assembly 7 pushes the push rod 6 to move downward, then the push rod 6 drives the throwing plate 322 to move downward, so that the throwing plate 322 opens the discharge port 321, the solid powder is thrown downward through the throwing plate 322, and is combined with the slurry which has not been volatilized inside the barrel 2, when the liquid is completely volatilized, the granular fertilizer is formed, by this throwing mode, it can be ensured that the powder in the barrel 2 will not be excessively accumulated to cause too large difference in particle size of the fertilizer.

[0028] Further, the feeding assembly 5 comprises a rotating rod 51 located in the feeding space, the rotating rod 51 is rotationally connected with the side plate 33, a plurality of feeding plates 52 are arranged on the side of the rotating rod 51, when the barrel 2 rotates, the rotating rod 51 rotates simultaneously.

[0029] Further, a gear one 53 is fixedly connected with one side of the rotating rod 51 in a coaxial manner, an internal gear 54 is fixedly arranged on the frame 1, the gear one 53 is engaged with the internal gear 54.

[0030] The rotating rod 51 rotates with the cylinder 2 under the action of the cylinder 2, at the same time, the gear one 53 rotates on the internal gear 54, so that the gear one 53 rotates, the gear one 53 drives the rotating rod 51 to rotate relative to the cylinder 2, when the rotating rod 51 rotates, the feeding plate 52 is driven to rotate, and when the solid powder enters the throwing cylinder section 21, the solid powder will first enter the feeding gap 4, at this time, the rotating rod 51 drives the feeding plate 52 to rotate and pushes the solid powder into the discharging space, rotates upward together with the cylinder 2, when the rotating rod 51 rotates to the top of the cylinder 2, the pushing rod pushes the throwing disc to open the discharging port 321, under the action of gravity, the solid powder falls from the discharging port 321, and the solid powder can be more dispersedly thrown in the air through the action of the throwing disc, so that the solid powder is more easily combined with other powders, and uneven fertilizer particle size caused by excessive accumulation of the solid powder is avoided.

[0031] Further, the pushing assembly 7 comprises a pushing cylinder 71 fixedly connected with the rack 1, a pushing block 72 is fixedly arranged at the top of the pushing cylinder 71, the inner wall of the pushing cylinder 71 is arc-shaped except the part of the pushing block 72, a spring 73 is sleeved on the pushing rod 6, one end of the spring 73 is fixedly connected with the outer wall of the throwing cylinder section 21, and the other end is fixedly connected with the pushing rod 6, the pushing rod 6 abuts against the inner wall of the pushing cylinder 71, and when the pushing rod 6 is on the arc-shaped cylinder wall of the pushing cylinder 71, the throwing plate 322 closes the discharging port 321.

[0032] The cylinder 2 drives the pushing rod 6 to rotate together, and the outer end of the pushing rod 6 slides in the pushing cylinder 71, when sliding to the part provided with the pushing block 72, the pushing rod 6 is compressed, so that the pushing rod 6 drives the throwing plate 322 to open the discharging port 321.

[0033] The working principle of the embodiment is as follows:

[0034] When the spray granulation is performed, the slurry is conveyed into the cylinder 2, the liquid in the cylinder 2 is volatilized by high temperature, the slurry in the slurry becomes solid powder, the solid powder is enriched, and then enters the throwing cylinder section 21, and the solid powder enters the feeding gap 4;

[0035] The rotating rod 51 rotates with the cylinder 2 under the action of the cylinder 2, at the same time, the gear one 53 rotates on the internal gear 54, so that the gear one 53 rotates, the gear one 53 drives the rotating rod 51 to rotate relative to the cylinder 2, when the rotating rod 51 rotates, the feeding plate 52 is driven to rotate, and when the solid powder enters the feeding gap 4, the feeding plate 52 pushes the solid powder in the feeding gap 4 into the discharging space, and the feeding is completed;

[0036] The cylinder 2 drives the push rod 6 to rotate, and the outer end of the push rod 6 slides in the inside of the pushing cylinder 71. When sliding to the part provided with the pushing block 72, the push rod 6 is compressed, so that the push rod 6 drives the throwing plate 322 to open the discharge port 321. Under the action of gravity, the solid powder is thrown downward through the throwing plate 322 and combined with the slurry in the inside of the cylinder 2 which has not been volatilized. When the liquid is volatilized completely, the granular fertilizer is formed. Through this throwing mode, it can be ensured that the powder in the cylinder 2 will not be excessively accumulated to cause too large difference in particle size of the fertilizer.

Claims

1. A process for phosphorus ammonium production, characterized by: The steps are: S1: using a dry ball mill to grind phosphate ore, to obtain a phosphate powder with a fineness of 150 mesh and a water content of 5%; S2: adding the phosphate powder into an extraction tank, adding sulfuric acid with a concentration of 85% at a weight ratio of phosphate powder to sulfuric acid of 1:0.95, the reaction temperature is 75-95 DEG C, the reaction time is 3-4 hours, to obtain an extraction slurry, the liquid-solid ratio of the intermediate extraction slurry is 2.5-3.0:1; S3: filtering the extraction slurry through a vacuum filter to obtain a wet extraction dilute phosphoric acid, and using a gas ammonia neutralizing device, a concentration device, a spray granulation device and a screening device in sequence to prepare ammonium phosphate from the dilute phosphoric acid; The spray granulation device comprises a rack (1) and a barrel (2), the rack (1) is provided with a power assembly for driving the barrel (2) to rotate, the axis of the barrel (2) is horizontally arranged, the barrel (2) comprises a throwing barrel section (21) located on one side close to a feeding port, a plurality of baffles (31) are arranged on the inner wall of the throwing barrel section (21) along the length direction, the plurality of baffles (31) are uniformly and spacedly arranged, the end portion of each baffle (31) is fixedly connected with a supporting plate (32), side plates (33) are arranged on the two sides of the throwing barrel section (21), the side plates (33), the baffles (31) and the supporting plates (32) form a storage space (3), a certain feeding gap (4) is arranged between adjacent storage spaces (3), a feeding assembly (5) for feeding the storage space (3) is arranged in the feeding gap (4), a plurality of discharge ports (321) are formed in the supporting plate (32), a throwing plate (322) is arranged at each discharge port (321), the throwing plate (322) can completely close the discharge port (321), the throwing plate (322) is connected with a push rod (6), the axis of the push rod (6) is arranged along the radial direction of the barrel section, a pushing assembly (7) is arranged outside the barrel section, when the push rod (6) is rotated to be located above the barrel section, the pushing assembly (7) pushes the push rod (6) to move downward.

2. The process for phosphorus ammonium production according to claim 1, characterized in that: The feeding assembly (5) comprises a rotating rod (51) arranged in a feeding space, the rotating rod (51) is rotatably connected with the side plate (33), a plurality of feeding plates (52) are arranged on the side of the rotating rod (51), when the barrel (2) rotates, the rotating rod (51) rotates simultaneously.

3. The process for phosphorus ammonium production according to claim 2, characterized by: A gear one (53) is fixedly connected with one side of the rotating rod (51), an internal gear (54) is fixedly arranged on the rack (1), and the gear one (53) is engaged with the internal gear (54).

4. The process for phosphorus ammonium production according to claim 1, characterized in that: The pushing assembly (7) comprises a pushing cylinder (71) fixedly connected with the rack (1), a pushing block (72) is fixedly arranged at the top of the pushing cylinder (71), the inner wall of the pushing cylinder (71) is arc-shaped except the pushing block (72), a spring (73) is sleeved on the push rod (6), one end of the spring (73) is fixedly connected with the outer wall of the throwing cylinder segment (21), and the other end is fixedly connected with the push rod (6), the push rod (6) is in abutment with the inner wall of the pushing cylinder (71), and when the push rod (6) is on the arc-shaped cylinder wall of the pushing cylinder (71), the throwing plate (322) closes the discharge port (321).

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