CN111905647A - Phosphogypsum granulation system - Google Patents
Phosphogypsum granulation system Download PDFInfo
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- CN111905647A CN111905647A CN202010745530.4A CN202010745530A CN111905647A CN 111905647 A CN111905647 A CN 111905647A CN 202010745530 A CN202010745530 A CN 202010745530A CN 111905647 A CN111905647 A CN 111905647A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/10—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in stationary drums or troughs, provided with kneading or mixing appliances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a phosphogypsum granulation system which comprises a phosphogypsum conveying skin conveyor, a phosphogypsum mechanical discharging bin, a phosphogypsum high-differential granulator, a granulator discharging conveying skin conveyor, a granulation screening machine and a phosphogypsum ball semi-finished product conveying skin conveyor, wherein the material return outlet of the granulation screening machine is connected with the phosphogypsum mechanical discharging bin through a screening material return conveying skin conveyor and a screening material return hoister. The invention is provided on the basis of fully researching the characteristics and granulation characteristics of the phosphogypsum materials, adopts the phosphogypsum high differential speed granulator, does not need to add other binders, and can solve the problems of low granulation strength, easy pulverization and the like commonly existing when the prior granulation technology is applied to the phosphogypsum.
Description
Technical Field
The invention relates to the field of comprehensive utilization of phosphogypsum, in particular to a phosphogypsum granulation system.
Background
Phosphogypsum is a byproduct produced by extracting phosphoric acid by a sulfuric acid method, and 1tP is produced every time2O54.5-5.5 tons of phosphogypsum will be produced. Compared with natural gypsum, the phosphogypsum contains a small amount of insoluble phosphorus, soluble phosphorus, fluoride, organic matters and other impurities, and cannot be directly utilized.
Most foreign countries have the main mode of treating the phosphogypsum by stockpiling, and more than 50 countries such as the United states, France, Brazil, Australia and the like have huge phosphogypsum stockyards at present. The main mode of treating the phosphogypsum in China is also a stockpiling mode, the emission amount is about 7000 ten thousand tons every year, great pressure is brought to the environment, the society and phosphorus chemical enterprises, and how to do the comprehensive utilization work of the phosphogypsum becomes a problem which needs to be solved urgently by the phosphorus chemical enterprises.
At present, the main research direction of comprehensive utilization of phosphogypsum is to prepare a cement retarder, and the process comprises the steps of phosphogypsum pre-homogenization, carbide slag neutralization, steam curing, stockpiling and curing and the like. Due to the characteristics of the phosphogypsum, large-area caking can occur after the steam curing is finished, so that the discharging difficulty is caused and the later use is influenced. Based on this, the phosphogypsum granulation procedure is added before steam curing, and the problems of low granulation strength, easy pulverization and difficult unloading of the phosphogypsum can be caused by the existing granulation technology, such as extrusion type, crushing type and common agglomeration type.
For example, the Chinese document "double-roller granulator and its application in phosphogypsum granulation" is based on an extrusion granulation method, and adopts the double-roller granulator to granulate the phosphogypsum. Although the method meets the requirement of phosphogypsum granulation through debugging, compared with other types of granulators, the double-roller granulator still has the defects of easy damage of the double rollers, more returned materials and high equipment inspection and maintenance rate.
The method can granulate the phosphogypsum, but the addition of the binder undoubtedly increases the cost, and simultaneously reduces the effective content of calcium sulfate in the cement retarder and influences the product quality.
Meanwhile, in the Chinese document 'research on phosphogypsum as cement retarder and granulation process thereof', beta-hemihydrate gypsum, cement clinker and hydrated lime are added into phosphogypsum for granulation, and the process has more granulation pretreatment processes and process control points, thereby increasing the labor cost and equipment investment to a certain extent.
And as in the Chinese patent phosphogypsum ball and the preparation method and application thereof, alkaline additives and gelling agents are respectively added into the phosphogypsum for granulation, and the method also needs to add a binder into the phosphogypsum, thereby increasing the cost to a certain extent.
In conclusion, the problems of high cost or low particle quality of phosphogypsum utilization and granulation still exist at present and need to be solved urgently.
Disclosure of Invention
The invention aims to provide a phosphogypsum granulating system, which solves the problems of low balling strength and easy pulverization of phosphogypsum generally existing in the granulating process without adding a binder.
In order to solve the technical problems, the invention adopts the following technical scheme:
the phosphogypsum granulation system comprises a phosphogypsum conveying belt conveyer, a phosphogypsum mechanical discharging bin, a phosphogypsum high-differential granulator, a granulator discharging conveying belt conveyer, a granulation screening machine and a phosphogypsum ball semi-finished product conveying belt conveyer which are sequentially arranged, wherein a return outlet of the granulation screening machine is connected with the phosphogypsum mechanical discharging bin through a screening return conveying belt conveyer and a screening return hoister.
Preferably, the phosphogypsum high-differential-speed granulator comprises a base and a mixing disc which is arranged on the base and driven by a motor to rotate, wherein a feeding hole is formed in the top end of the mixing disc, a discharging hole is formed in the bottom end of the mixing disc, a granulation rotating group which is opposite to the rotation direction of the mixing disc is arranged in the mixing disc, and the granulation rotating group comprises a granulation rotor main shaft driven by the motor to rotate, and a granulation stirring paddle blade, a granulation bottom cleaner and a granulation side cleaner which are arranged on the granulation rotor main shaft.
Preferably, the rotating speed of the granulating rotor set is 60-500 revolutions per minute, the rotating speed of the mixing disk is 4-110 revolutions per minute, and the ratio of the height of the granulating rotor set to the height of the mixing disk is 0.2:1-0.95: 1.
Preferably, the ratio of the length of the blades of the granulating stirring blade, the granulating bottom cleaner and the granulating side cleaner to the radius of the mixing disk is 0.25:1-0.78:1, 0.32:1-0.95:1 and 0.38:1-0.92:1 respectively.
Preferably, the granulation stirring paddle and the phosphogypsum high-differential speed granulator respectively have an included angle of 18-82 degrees and an included angle of 25-75 degrees with the horizontal plane.
Preferably, the granulation stirring paddle and the main shaft of the granulation rotor are connected through an elastic block.
Preferably, the granulation stirring blade is an elastic rod.
Preferably, the phosphogypsum mechanical discharging bin comprises four side walls and a discharging plate movably connected with one of the side walls, wherein an included angle between one wall surface and the horizontal plane is 90 degrees, included angles between the other three wall surfaces and the horizontal plane are 30-120 degrees, and an included angle between the discharging plate and the side wall of the phosphogypsum mechanical discharging bin is 100-260 degrees when the discharging plate is in an opening state.
Preferably, a baffle is arranged in the discharging bin, one end of the baffle is an upward inclined free end, and the other end of the baffle is fixedly connected to the inner wall of the discharging bin through an elastic connecting sheet; be provided with the striking chamber in the baffle, be provided with the contained angle between the lateral wall of striking chamber and fixed stop, be provided with the striking ball that can follow the striking chamber and remove in the striking intracavity.
Compared with the prior art, the invention has the beneficial effects of at least one of the following:
the invention is provided on the basis of fully researching the characteristics and granulation characteristics of the phosphogypsum material, and other binders are not needed to be added. Can solve the problems of low balling strength, easy pulverization and the like commonly existing when the prior granulation technology is applied to phosphogypsum.
The invention can also ensure the balling rate according to the matching of different phosphogypsum containing water with the optimal pelleting condition. The invention can produce 2-30mm phosphogypsum balls according to the requirement, and the compressive strength after curing is more than 60N.
The phosphogypsum ball has uniform particles and moderate strength, is a high-quality cement retarder, can meet the requirement of ordinary portland cement and high-quality cement on the condensation effect, and has better performance than natural gypsum in the aspect of enhancing the cement strength.
The impact cavity and the impact ball are arranged on the discharging bin, so that materials can be prevented from being attached to the bin wall of the discharging bin, and the accuracy of material discharging control is improved.
Drawings
Fig. 1 is a schematic structural view of a phosphogypsum granulation system of the invention.
FIG. 2 is a main view of the phosphogypsum high differential speed granulator of the invention.
Fig. 3 is a sectional view of the phosphogypsum high differential speed granulator.
Fig. 4 is a schematic view of the baffle installation of the present invention.
Fig. 5 is a diagram of a semi-finished product of phosphogypsum balls obtained by using the phosphogypsum granulation system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The phosphogypsum granulation system in the embodiment comprises a phosphogypsum conveying skin conveyer, a phosphogypsum mechanical discharging bin, a phosphogypsum high-differential granulator, a granulator discharging conveying skin conveyer, a granulation screening machine and a phosphogypsum ball semi-finished product conveying skin conveyer which are sequentially arranged, wherein a return outlet of the granulation screening machine is connected with the phosphogypsum mechanical discharging bin through a screening return conveying skin conveyer and a screening return hoister.
The phosphogypsum high-differential granulator comprises a base and a mixing disc, wherein the mixing disc is arranged on the base and driven to rotate by a motor, a feeding hole is formed in the top end of the mixing disc, a discharging hole is formed in the bottom end of the mixing disc, a granulation rotating group in the opposite direction to the rotation direction of the mixing disc is arranged in the mixing disc, and the granulation rotating group comprises a granulation rotor spindle driven to rotate by the motor, and a granulation stirring paddle blade, a granulation bottom cleaner and a granulation side cleaner which are arranged on the granulation rotor spindle.
The main body of the phosphogypsum granulation system in the embodiment comprises a phosphogypsum conveying belt conveyer 1, a phosphogypsum mechanical discharging bin 2, a phosphogypsum high-differential speed granulator 3, a granulator discharging conveying belt conveyer 4, a granulation screening machine 5, a phosphogypsum ball semi-finished product conveying belt conveyer 6, a phosphogypsum ball semi-finished product warehouse 7, a screening return conveying belt conveyer 8, a screening return hoister 9 and a screening return conveying belt conveyer 10. The main body of the phosphogypsum high-differential-speed granulator 3 consists of a high-speed rotor driving motor 11, a high-speed rotor transmission device group 12, a mixing disc driving speed reducer 13, a mixing disc transmission device group 14, a granulating rotor group 15, a mixing disc 16, a mixing disc outer protective shell 17, a granulator main frame 18, a bottom discharge door hydraulic opening and closing device 19, a discharge door safety controller 19.1, a centralized lubricating system 20, a bottom access door 21, a bottom access door safety controller 21.1, a top transmission protective cover 22, a side motor/speed reducer protective cover 23, a dust removal opening No. 1 No. 24, a dust removal opening No. 2 No. 25, a top cover observation door 26, a feed inlet 27, a granulator side access door 28, a side access door safety controller 28.1 and a hydraulic pump station system 29; the granulation rotor group 15 comprises a granulation rotor spindle 15.1, granulation stirring blades 15.2, a granulation stirring hub 15.3, a granulation bottom sweeper 15.4 and a granulation side sweeper 15.5.
When the device runs, homogenized phosphogypsum and a modifying additive are transported to a phosphogypsum mechanical discharging bin 2 by a phosphogypsum conveying belt conveyor 1, at the moment, a discharging bin door is in a closed state, and when the amount of phosphogypsum in the discharging bin reaches a preset value, the discharging bin door is opened, and the phosphogypsum enters a phosphogypsum high-differential speed granulator 3.
A high-speed rotor driving motor 11 in the phosphogypsum high-differential granulator 3 drives a granulation rotor spindle 15.1, a granulation stirring paddle 15.2, a granulation stirring hub 15.3, a granulation bottom sweeper 15.4 and a granulation side sweeper 15.5 to rotate clockwise or anticlockwise through a high-speed rotor transmission device group 12, and meanwhile, a mixing disc driving speed reducer 13 drives a mixing disc 16 to rotate clockwise or anticlockwise through a mixing disc transmission device group 14. The phosphogypsum and the mixing disc 16 rotate together, and the granulating and stirring blade 15.2 rotating at the centrifugal position generates force capable of shearing and kneading materials. In the rotating process, the phosphogypsum high-differential speed granulator 13 is inclined, and the phosphogypsum is conveyed to the top of the mixing disc 16 under the action of upward thrust and then overturned under the action of a granulation bottom sweeper 15.4 and a granulation side sweeper 15.5. The phosphogypsum can be efficiently granulated in a short time and has the effects of tiny fineness by adjusting the rotating speed of the mixing disc 16 and the main shaft 15.1 of the granulating rotor, the sizes of the granulating stirring paddle 15.2, the granulating bottom sweeper 15.4 and the granulating side sweeper 15.5, the angle of the granulating stirring paddle 15.2, the inclination degree of the phosphogypsum high-differential-speed granulator 3, the rotating speed of the cylinder and the rotor of the high-differential-speed mixing granulator 3 and the granulating time, so that the phosphogypsum with different water contents can be granulated and the particle size can be controlled. In the operation process, the bottom discharge door hydraulic opening and closing device 19 is in a closed state, and the circulating oil pump of the centralized lubricating system 20 enables cooling oil to circularly flow in the high-speed rotor transmission device group 12 and other parts, so as to achieve the cooling effect. The granulation effect can be monitored in real time through the top cover observation door 26. After granulation, the hydraulic pump station system 29 drives the bottom discharge door hydraulic opening and closing device 19 to discharge.
And (3) transferring the granulated phosphogypsum balls to a granulating screening machine 5 for screening by a granulator discharging conveying belt conveyor 4, and transferring the phosphogypsum ball semi-finished products meeting the particle size specification to a phosphogypsum ball semi-finished product warehouse 7 by a conveying belt conveyor 6. The undersize material of the granulation screening machine 5 returns to the phosphogypsum mechanical discharging bin 2 through a screening return material conveying skin conveyor 8, a screening return material hoister 9 and a screening return material conveying skin conveyor 10.
A baffle plate can be arranged in the phosphogypsum mechanical discharging bin 2, one end of the baffle plate 202 is an upward inclined free end, and the other end of the baffle plate is fixedly connected to the inner wall of the discharging bin through an elastic connecting sheet 201; be provided with striking chamber 203 in the baffle, be provided with the contained angle between the lateral wall of striking chamber and fixed stop, be provided with the striking ball 204 that can follow the chamber removal of striking in the striking intracavity.
The height of the baffle can be selected by a person skilled in the art according to needs, the baffle can be selectively arranged at the bottom of a mechanical phosphogypsum discharging bin, when materials in the mechanical phosphogypsum discharging bin reach a preset value, an outlet at the bottom of the mechanical phosphogypsum discharging bin is opened, a downward pressure can be applied to the baffle in the material discharging process, so that the baffle is obliquely arranged, an impact ball in an impact cavity is close to a lower free end, when the materials in the mechanical phosphogypsum discharging bin are gradually reduced, the pressure of the materials on the baffle is suddenly reduced, the free end of the baffle is made to bounce upwards, the impact ball rapidly moves in the direction far away from the free end and collides with the end part of the impact cavity, vibration is transmitted to the wall of the mechanical phosphogypsum discharging bin, and the materials attached to the inner wall. In order to effectively transmit the vibration of the impact cavity and the impact ball to the inner wall of the phosphogypsum mechanical discharging bin, the elastic connecting sheet can be made of a metal material with certain elasticity.
In order to ensure that materials in the phosphogypsum mechanical discharging bin can provide certain pressure for the baffle plates and do not influence the materials to leave the phosphogypsum mechanical discharging bin, the baffle plates have certain width, in order to ensure that the impact force generated between the impact ball and the impact cavity reaches certain strength, the baffle plates have certain length, and a plurality of baffle plates can be arranged under the condition of not influencing the working of the phosphogypsum mechanical discharging bin if necessary.
The granulation stirring paddle blade and the main shaft of the granulation rotor can be connected through an elastic block or the granulation stirring paddle blade is an elastic rod.
When the stirring paddle is driven by the main shaft to collide with the phosphogypsum materials, the phosphogypsum is buffered to a certain extent in the collision process due to the existence of the elastic block or the certain elasticity of the stirring paddle, so that the strength of the semi-finished phosphogypsum ball can be effectively improved.
In this embodiment, the rotation speed of the granulating rotor set can be 60-500 rpm, the rotation speed of the mixing disk can be 4-110 rpm, and the ratio of the height of the granulating rotor set to the height of the mixing disk can be 0.2:1-0.95: 1; the ratio of the length of the blades of the granulating stirring blade, the granulating bottom sweeper and the granulating side sweeper to the radius of the mixing disc can be respectively 0.25:1-0.78:1, 0.32:1-0.95:1 and 0.38:1-0.92: 1; the included angles between the granulating stirring blade and the phosphogypsum high-differential speed granulator and the horizontal plane can be respectively 18-82 degrees and 25-75 degrees; the phosphogypsum mechanical discharging bin comprises four side walls and a discharging plate movably connected with one of the side walls, wherein the included angle between one wall surface and the horizontal plane can be 90 degrees, the included angles between the other three wall surfaces and the horizontal plane can be 30-120 degrees, and the included angle between the discharging plate and the side wall of the phosphogypsum mechanical discharging bin can be 100-260 degrees in an opening state.
Example 1:
the pre-homogenized gypsum with the water content of 8 percent and the modified neutralizer are transported to a phosphogypsum mechanical discharging bin 2 by a phosphogypsum conveying belt conveyor 1, at the moment, a discharging bin door is in a closed state, the included angle between one wall surface of four discharging walls of the phosphogypsum mechanical discharging bin 2 and the horizontal plane is 90 degrees, the included angles between the other three wall surfaces and the horizontal plane are respectively 70 degrees, 70 degrees and 80 degrees, when the amount of phosphogypsum in the discharging bin reaches a preset value, the discharging bin door is opened, the bin opening angle between a discharging plate and the discharging wall with a hinge end is 120 degrees, and the phosphogypsum enters a phosphogypsum high-differential speed mixing granulator.
A high-speed rotor driving motor in the phosphogypsum high-differential mixing granulator 3 drives a granulating rotor set (comprising a granulating stirring paddle, a granulating bottom sweeper and a granulating side sweeper) to rotate clockwise through a high-speed rotor transmission set, and meanwhile, a mixing disc driving speed reducer drives a mixing disc to rotate anticlockwise through a mixing disc transmission set.
Wherein the rotating speed of the granulating rotor set is 98 revolutions per minute, the rotating speed of the mixing disk is 9 revolutions per minute, and the ratio of the height of the granulating rotor set to the height of the mixing disk is 0.45: 1; the granulation stirring paddle consists of 3 groups of paddle layers, and each layer consists of 2 granulation stirring paddles.
After granulation is finished, the materials to be screened of the semi-finished products of the phosphogypsum balls are transferred to a granulating material screening machine 5 by a granulator discharging belt conveyor 4 for screening, and the semi-finished products of the phosphogypsum balls meeting the particle size specification are transferred to the next working section or a phosphogypsum ball semi-finished product warehouse 7 by a phosphogypsum ball semi-finished product conveying belt conveyor 6. The undersize material of the granulating material sieving machine 5 returns to the phosphogypsum mechanical discharging bin 2 through a sieving return belt conveyer 8 and a sieving return hoister 9. The picture of the final product of phosphogypsum ball is shown in figure 5 and contains H2O wt%: 7.8, soluble P2O5wt%: 0.018, pH: 7.9, SO3wt%: 42.9, strength: 32N, strength after aging: 64N, particle size: 28mm-30 mm.
Example 2:
the pre-homogenized gypsum with the water content of 11 percent and the modified neutralizer are transported to a phosphogypsum mechanical discharging bin 2 by a phosphogypsum conveying belt conveyor 1, at the moment, a discharging bin door is in a closed state, the included angle between one wall surface of four discharging walls of the phosphogypsum mechanical discharging bin 2 and the horizontal plane is 90 degrees, the included angles between the other three wall surfaces and the horizontal plane are respectively 75 degrees, 75 degrees and 84 degrees, when the amount of phosphogypsum in the discharging bin reaches a preset value, the discharging bin door is opened, the bin opening angle between a discharging plate and the discharging wall with a hinge end is 135 degrees, and the phosphogypsum enters a phosphogypsum high-differential speed mixing granulator.
A high-speed rotor driving motor in the phosphogypsum high-differential mixing granulator 3 drives a granulating rotor set (comprising a granulating stirring paddle, a granulating bottom sweeper and a granulating side sweeper) to rotate anticlockwise through a high-speed rotor transmission set, and meanwhile, a mixing disc driving speed reducer drives a mixing disc to rotate clockwise through a mixing disc transmission set.
Wherein the rotating speed of the granulating rotor set is 110 revolutions per minute, the rotating speed of the mixing disk is 12 revolutions per minute, and the ratio of the height of the granulating rotor set to the height of the mixing disk is 0.6: 1; the granulation stirring paddle consists of 4 groups of paddle layers, and each layer consists of 3 granulation stirring paddles.
After granulation is finished, the materials to be screened of the semi-finished products of the phosphogypsum balls are transferred to a granulating material screening machine 5 by a granulator discharging belt conveyor 4 for screening, and the semi-finished products of the phosphogypsum balls meeting the particle size specification are transferred to the next working section by a phosphogypsum ball semi-finished product conveying belt conveyor 6. The undersize material of the granulating material sieving machine 5 returns to the phosphogypsum mechanical discharging bin 2 through a sieving return belt conveyer 8 and a sieving return hoister 9. The finished product of the phosphogypsum ball contains H2O wt%: 11.1, soluble P2O5wt%: 0.019, pH: 7.5, SO3wt%: 41.4, strength: 29N, strength after aging: 68N, particle size: 20mm-24 mm.
Example 3:
the pre-homogenized gypsum with the water content of 18 percent and the modified neutralizer are transported to a phosphogypsum mechanical discharging bin 2 by a phosphogypsum conveying belt conveyor 1, at the moment, a discharging bin door is in a closed state, the included angle between one wall surface of four discharging walls of the phosphogypsum mechanical discharging bin 2 and the horizontal plane is 90 degrees, the included angles between the other three wall surfaces and the horizontal plane are respectively 80 degrees, 80 degrees and 90 degrees, when the amount of phosphogypsum in the discharging bin reaches a preset value, the discharging bin door is opened, the bin opening angle between a discharging plate and the discharging wall with a hinge end is 155 degrees, and the phosphogypsum enters a phosphogypsum high-differential speed mixing granulator.
A high-speed rotor driving motor in the phosphogypsum high-differential mixing granulator 3 drives a granulating rotor set (comprising a granulating stirring paddle, a granulating bottom sweeper and a granulating side sweeper) to rotate anticlockwise through a high-speed rotor transmission set, and meanwhile, a mixing disc driving speed reducer drives a mixing disc to rotate clockwise through a mixing disc transmission set.
Wherein the rotating speed of the granulating rotor set is 140 revolutions per minute, the rotating speed of the mixing disk is 12 revolutions per minute, and the ratio of the height of the granulating rotor set to the height of the mixing disk is 0.75: 1; the granulation stirring paddle consists of 5 groups of paddle layers, and each layer consists of 3 granulation stirring paddles.
After granulation is finished, the materials to be screened of the semi-finished products of the phosphogypsum balls are transferred to a granulating material screening machine 5 by a granulator discharging belt conveyor 4 for screening, and the semi-finished products of the phosphogypsum balls meeting the particle size specification are transferred to the next working section by a phosphogypsum ball semi-finished product conveying belt conveyor 6. The undersize material of the granulating material sieving machine 5 returns to the phosphogypsum mechanical discharging bin 2 through a sieving return belt conveyer 8 and a sieving return hoister 9. The finished product of the phosphogypsum ball contains H2O wt%: 18.6, soluble P2O5wt%: 0.011, pH: 7.6, SO3wt%: 39.1, strength: 24N, strength after aging: 67N, particle size: 18mm-20 mm.
Example 4:
the pre-homogenized gypsum with the water content of 22 percent and the modified neutralizer are transported to a phosphogypsum mechanical discharging bin 2 by a phosphogypsum conveying belt conveyor 1, at the moment, a discharging bin door is in a closed state, the included angle between one wall surface of four discharging walls of the phosphogypsum mechanical discharging bin 2 and the horizontal plane is 90 degrees, the included angles between the other three wall surfaces and the horizontal plane are respectively 85 degrees, 85 degrees and 85 degrees, when the amount of phosphogypsum in the discharging bin reaches a preset value, the discharging bin door is opened, the bin opening angle between a discharging plate and the discharging wall with a hinge end is 180 degrees, and the phosphogypsum enters a phosphogypsum high-differential speed mixing granulator.
A high-speed rotor driving motor in the phosphogypsum high-differential mixing granulator 3 drives a granulating rotor set (comprising a granulating stirring paddle, a granulating bottom sweeper and a granulating side sweeper) to rotate anticlockwise through a high-speed rotor transmission set, and meanwhile, a mixing disc driving speed reducer drives a mixing disc to rotate clockwise through a mixing disc transmission set.
Wherein the rotating speed of the granulating rotor set is 180 revolutions per minute, the rotating speed of the mixing disk is 16 revolutions per minute, and the ratio of the height of the granulating rotor set to the height of the mixing disk is 0.8: 1; the granulation stirring paddle consists of 8 groups of paddle layers, and each layer consists of 4 granulation stirring paddles.
After granulation is finished, the materials to be screened of the semi-finished products of the phosphogypsum balls are transferred to a granulating material screening machine 5 by a granulator discharging belt conveyor 4 for screening, and the semi-finished products of the phosphogypsum balls meeting the particle size specification are transferred to the next working section by a phosphogypsum ball semi-finished product conveying belt conveyor 6. The undersize material of the granulating material sieving machine 5 returns to the phosphogypsum mechanical discharging bin 2 through a sieving return belt conveyer 8 and a sieving return hoister 9. The finished product of the phosphogypsum ball contains H2O wt%: 22.2, soluble P2O5wt%: 0.013, pH: 7.4, SO3wt%: 37.9, strength: 19N, strength after aging: 70N, particle size: 11mm-13 mm.
Example 5:
the difference from the embodiment 4 is that the granulation stirring paddle and the main shaft of the granulation rotor are connected through an elastic block, and the finished product strength of the phosphogypsum ball is as follows: 33N, strength after aging: 75N, particle size: 11mm-13 mm.
Example 6:
the difference from the example 4 is only that the granulation stirring paddle is a rubber elastic rod, and the finished product strength of the phosphogypsum ball is as follows: 31N, strength after aging: 73N, particle size: 11mm-13 mm.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (9)
1. An ardealite granulation system which is characterized in that: the device comprises a phosphogypsum conveying skin conveyer, a phosphogypsum mechanical discharging bin, a phosphogypsum high differential granulator, a granulator discharging conveying skin conveyer, a granulation screening machine and a phosphogypsum ball semi-finished product conveying skin conveyer which are sequentially arranged, wherein a return outlet of the granulation screening machine is connected with the phosphogypsum mechanical discharging bin through a screening return conveying skin conveyer and a screening return hoister.
2. The phosphogypsum granulation system according to claim 1, wherein the phosphogypsum high-differential speed granulator comprises a base and a mixing disc which is arranged on the base and driven by a motor to rotate, wherein a feeding hole is formed in the top end of the mixing disc, a discharging hole is formed in the bottom end of the mixing disc, a granulation rotating group which is opposite to the rotation direction of the mixing disc is arranged in the mixing disc, and the granulation rotating group comprises a granulation rotor main shaft which is driven by the motor to rotate, and a granulation stirring paddle, a granulation bottom sweeper and a granulation side sweeper which are arranged on the granulation rotor main shaft.
3. The phosphogypsum granulation system according to claim 2, wherein the rotation speed of the granulation rotor set is 60-500 rpm, the rotation speed of the mixing disc is 4-110 rpm, and the ratio of the height of the granulation rotor set to the height of the mixing disc is 0.2:1-0.95: 1.
4. The phosphogypsum granulation system according to claim 2, characterized in that the ratio of the length of the blades of the granulation stirring blades, the granulation bottom sweeper and the granulation side sweeper to the radius of the mixing disc is 0.25:1-0.78:1, 0.32:1-0.95:1 and 0.38:1-0.92:1, respectively.
5. The phosphogypsum granulation system according to claim 2, wherein the granulation stirring paddle and the phosphogypsum high differential speed granulator respectively have an included angle of 18-82 degrees and an included angle of 25-75 degrees with the horizontal.
6. The phosphogypsum granulation system according to claim 2, characterized in that the granulation stirring blades are connected with the main shaft of the granulation rotor through elastic blocks.
7. The phosphogypsum granulation system according to claim 2, characterized in that the granulation stirring blades are elastic rods.
8. The phosphogypsum granulation system according to claim 1, wherein the phosphogypsum mechanical discharging bin comprises four side walls and a discharging plate movably connected with one of the side walls, wherein the included angle between one wall surface and the horizontal plane is 90 degrees, the included angles between the other three wall surfaces and the horizontal plane are 30-120 degrees, and the included angle between the discharging plate and the side wall of the phosphogypsum mechanical discharging bin in an opening state is 100-260 degrees.
9. The phosphogypsum granulation system according to claim 1, wherein a baffle is arranged at the upper part of the discharging bin, one end of the baffle is a free end, and the other end of the baffle is fixedly connected to the inner wall of the discharging bin through an elastic connecting sheet; be provided with the striking chamber in the baffle, be provided with the contained angle between the lateral wall of striking chamber and fixed stop, be provided with the striking ball that can follow the striking chamber and remove in the striking intracavity.
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| CN114307841A (en) | 2022-04-12 |
| CN114307841B (en) | 2023-04-18 |
| CN111905647B (en) | 2022-03-15 |
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