Phosphorite powder thermosetting balling device

Abstract

The utility model discloses a phosphorite powder thermosetting balling device, which relates to the technical field of phosphorite powder caking, and comprises an inner furnace body, a middle furnace body and an outer furnace body which are concentrically and radially arranged at intervals, a thermosetting chamber is formed between the outer furnace body and the middle furnace body, a cooling air duct is formed between the middle furnace body and the inner furnace body, and a plurality of discharge ports are arranged at the bottom of the outer furnace body. A plurality of ventilation openings for communicating the cooling air duct with the thermosetting chamber are formed in the middle furnace body; the inner furnace body, the middle furnace body and the outer furnace body are jointly covered with a top cover, and the top cover is provided with a plurality of discharging hoppers communicating with the thermosetting chamber. The smoke exhaust pipe is communicated with the interior of the inner furnace body, and a combustion chamber communicated with the thermosetting chamber is arranged on the outer furnace body. The device can replace raw ore to directly enter a yellow phosphorus electric furnace for smelting, the pellet strength is enhanced, the pellet ignition loss is reduced, and the pellet quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphate rock powder pelletization, in particular to a phosphate rock powder thermal solidification pelletization device. Background Art

[0002] The pelletizing process of phosphate rock powder mainly includes pelletizing process and briquetting process. The pelletizing process usually refers to adding materials and liquids into a cylindrical, disc, vibrating or stirring briquetting machine to form pellets, and then using drying and roasting or other methods to make them undergo a series of physical and chemical changes to harden and unite. The briquetting process is to prepare raw materials (finely ground concentrate or other finely ground powdered materials, additives or binders, etc.) in a certain proportion, mix them, and make them into raw balls of a certain size by the briquetting equipment, and then use drying and roasting or other methods to make them undergo a series of physical and chemical changes to harden and unite.

[0003] Among them, the phosphate ore concentrate pellets produced by the ball making process have poor strength and heavy powder, which not only makes the phosphate ore concentrate pellets easy to burst during the subsequent hardening process, but also has a large loss on ignition during the hardening process, and cannot directly replace the original ore in the yellow phosphorus electric furnace smelting. Although the phosphate ore concentrate pellets produced by the ball pressing process have high strength and good quality after hardening, they are inefficient during the ball pressing process, with high loss on ignition of the finished pellets and high pulverization rate in the furnace. After replacing the original ore in the yellow phosphorus electric furnace smelting, they will cause more mud phosphorus and low recovery rate.

[0004] Therefore, there is an urgent need for a phosphate rock powder thermosetting molding device that can cooperate with a pelletizing process. Utility Model Content

[0005] The utility model aims to provide a device for hot-fixing phosphate rock powder into pellets, which can replace the original ore and directly enter the yellow phosphorus electric furnace for smelting, thereby strengthening the pellet strength, reducing the pellet loss on ignition, and increasing the pellet quality.

[0006] In order to achieve the purpose of the utility model, the technical solution adopted is: a phosphate rock powder hot-setting ball-forming device, comprising an inner furnace body, an intermediate furnace body and an outer furnace body arranged concentrically and radially at intervals, a hot-setting chamber is formed between the outer furnace body and the intermediate furnace body, a cooling air duct is formed between the intermediate furnace body and the inner furnace body, and a plurality of discharge ports are opened at the bottom of the outer furnace body, and a plurality of ventilation ports for connecting the cooling air duct and the hot-setting chamber are opened on the intermediate furnace body; the inner furnace body, the intermediate furnace body and the outer furnace body are jointly covered with a top cover, and a plurality of lower hoppers connected to the hot-setting chamber are opened on the top cover; it also includes a smoke exhaust pipe connected to the interior of the inner furnace body, and the outer furnace body is provided with a combustion chamber connected to the hot-setting chamber.

[0007] Furthermore, the inner furnace body, the middle furnace body, the outer furnace body and the combustion chamber are all constructed of refractory bricks.

[0008] Furthermore, the inner wall of the inner furnace body and the outer wall of the outer furnace body are both covered with steel plates, and refractory wool is also filled between the steel plates on the inner wall of the inner furnace body and the outer wall of the inner furnace body.

[0009] Furthermore, the outer furnace body is provided with a plurality of burners, which are evenly spaced apart along the circumferential direction of the outer furnace body.

[0010] Furthermore, operating platforms are provided on the outer periphery of the combustion chamber and the outer periphery of the top of the outer furnace body.

[0011] Furthermore, a fire baffle wall is provided on one side of the combustion chamber close to the thermosetting chamber.

[0012] Furthermore, a material blocking plate is also arranged in the vent.

[0013] Furthermore, the lower hopper is a sunken structure on the top cover, and the discharge end of the lower hopper extends into the heat curing chamber.

[0014] Furthermore, the multiple lower hoppers and the multiple discharge ports are evenly spaced apart along the circumferential direction of the thermosetting chamber.

[0015] Furthermore, it also includes a building base, and the inner furnace body, the middle furnace body, the outer furnace body and the smoke exhaust pipe are all installed on the building base.

[0016] Furthermore, a discharge guide plate is provided on the outer furnace body, the inner end of the discharge guide plate is fixed to the bottom of the thermosetting chamber, and the outer end of the discharge guide plate passes through the discharge port and then extends obliquely downward.

[0017] The beneficial effects of the utility model are:

[0018] The utility model can cooperate with the pelletizing process to produce phosphate ore concentrate pellets formed by the pelletizing process. Not only can the pellet strength be enhanced during the hot solidification process, but the pellets will not be pulverized or cracked. Without affecting the production efficiency, the ignition loss of the pellets can be effectively reduced, the quality of the pellets can be increased, and the original ore can be directly put into the furnace instead of the original ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings illustrate exemplary embodiments of the present invention and are used to explain the principles of the present invention together with the description. These drawings are included to provide a further understanding of the present invention, and the drawings are included in and constitute a part of this specification.

[0020] Figure 1 It is a structural schematic diagram of a phosphate rock powder thermal solidification ball forming device provided by the utility model;

[0021] Figure 2 yes Figure 1 Sectional view of AA.

[0022] Markings and corresponding parts names in the attached drawings:

[0023] 1. Outer furnace body, 2. Middle furnace body, 3. Inner furnace body, 4. Combustion chamber, 5. Thermosetting chamber, 6. Cooling air duct, 7. Smoke exhaust pipe, 8. Burner, 9. Operating platform, 10. Column, 11. Oblique support structure, 12. Top cover, 13. Lower hopper, 14. Rib plate, 15. Ventilation port, 16. Baffle plate, 17. Fire wall, 18. Discharge port, 19. Discharge guide plate, 20. Steel plate. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and implementations. It is to be understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] like Figure 1 , Figure 2 As shown, a phosphate rock powder hot-setting pelletizing device provided by the utility model includes an inner furnace body 3, an intermediate furnace body 2 and an outer furnace body 1, and the centers of the inner furnace body 3, the intermediate furnace body 2 and the outer furnace body 1 are all located on the same straight line, and there are intervals between the inner furnace body 3 and the intermediate furnace body 2, and between the intermediate furnace body 2 and the outer furnace body 1, and the interval between the inner furnace body 3 and the intermediate furnace body 2 is a cooling air duct 6, and the interval between the intermediate furnace body 2 and the outer furnace body 1 is a hot-setting chamber 5, that is, the combustion chamber 4 and the cooling air duct are both annular, and the phosphate rock concentrate powder pellets are located in the hot-setting chamber 5 during hot-setting. In the design, the width of the cooling air duct 6 is much smaller than the width of the hot-setting chamber 5.

[0027] In order to ensure that the phosphate rock powder pellets in the heat-setting chamber 5 are heat-set, the outer furnace body 1 is further provided with a combustion chamber 4 connected to the heat-setting chamber 5. Since the heat-setting chamber 5 is annular, in order to ensure that the phosphate rock powder pellets in the entire heat-setting chamber 5 can be heat-set, the heat-setting chamber 5 is also annular, and the circumference of the combustion chamber 4 is connected to the heat-setting chamber 5.

[0028] In order to ensure that the cooling air in the cooling air duct 6 can enter the thermosetting chamber 5 to cool the thermosetting phosphate ore concentrate pellets, a plurality of vents 15 are also provided on the middle furnace body 2. The plurality of vents 15 are evenly distributed not only along the circumferential direction of the middle furnace body 2, but also along the height direction of the middle furnace body 2, that is, the plurality of vents 15 are evenly distributed on the entire circumferential surface of the middle furnace body 2. When the plurality of vents 15 are arranged, two adjacent layers of vents 15 can be staggered on the circumference.

[0029] In order to ensure that the phosphate ore concentrate pellets can be discharged from the heat-setting chamber 5 after heat-setting in the heat-setting chamber 5, a plurality of discharge ports 18 are also provided on the outer furnace body 1, and the plurality of discharge ports 18 correspond to the bottom of the heat-setting chamber 5, and the plurality of discharge ports 18 are evenly spaced along the circumferential direction of the outer furnace body 1. Since the heat-setting chamber 5 has a certain height, the heat-setting chamber 5 is divided into a preheating section, a high temperature section and a cooling section from top to bottom, wherein the height ratio of the preheating section, the high temperature section and the cooling section is 2:1:3, and the discharge port 18 corresponds to the cooling section, so that the heat-set phosphate ore concentrate pellets are discharged from the discharge port 18 after being cooled in the cooling section, and the combustion chamber 4 corresponds to the combustion section, so that the heat generated by the combustion in the combustion chamber 4 can directly enter the combustion section to heat-set the phosphate ore concentrate pellets, so that the heat-setting effect of the phosphate ore concentrate pellets in the high temperature section is better.

[0030] Since the discharge port 18 is located at the bottom of the outer furnace body 1, in order to prevent the cooling effect of the phosphate ore concentrate pellets after heat setting from being poor due to the short distance of the cooling section, the combustion chamber 4 can be arranged in the middle of the outer furnace body 1, so as to ensure that the cooling section has a sufficient length, and avoid the phosphate ore concentrate pellets after heat setting in the high temperature section from being directly discharged from the discharge port 18 without being fully cooled in the cooling section. In order to prevent the phosphate ore concentrate pellets in the heat setting chamber 5 from being directly discharged from the discharge port 18, a switch door that can open and close the discharge port 18 can also be arranged on the outer furnace body 1.

[0031] The inner furnace body 3, the middle furnace body 2 and the outer furnace body 1 are commonly covered with a top cover 12, but in order to facilitate the addition of phosphate rock concentrate pellets into the thermosetting chamber 5, a lower hopper 13 is also provided on the top cover 12, and in order to enable the phosphate rock concentrate pellets fed into the thermosetting chamber 5 through the lower hopper 13 to fill the entire thermosetting chamber 5, there are multiple lower hoppers 13 on the top cover 12, and the multiple lower hoppers 13 are evenly spaced along the circumferential direction of the thermosetting chamber 5.

[0032] In order to facilitate the discharge of the exhaust gas generated after thermosetting in the combustion chamber 4, the top cover 12 is designed to ensure that after the top cover 12 is jointly installed on the inner furnace body 3, the middle furnace body 2 and the outer furnace body 1, there is a certain distance between the lower surface of the top cover 12 and the top of the inner furnace body 3 and the top of the middle furnace body 2, so that the flue gas generated after the thermosetting in the high-temperature section is completed can enter the inner furnace body 3 through the gap between the top cover 12 and the top of the inner furnace body 3, and the gap between the top cover 12 and the top of the middle furnace body 2 after preheating the phosphate rock concentrate pellets in the preheating section. At this time, the inner furnace body 3 is also provided with a smoke exhaust pipe 7 for sending out the exhaust gas.

[0033] As a further option in this embodiment, the inner furnace body 3, the middle furnace body 2, the outer furnace body 1 and the combustion chamber 4 are all constructed of refractory bricks. During the construction of the middle furnace body 2 and the inner furnace body 3, in order to retain the cooling air duct 6, the middle part of the middle furnace body 2 and the lower part of the middle furnace body 2 are constructed with shorter refractory bricks, and when the middle part of the middle furnace body 2 and the lower part of the middle furnace body 2 are constructed, a certain distance is retained between the outer wall of the inner furnace body 3 and the inner wall of the middle furnace body 2, and this distance is the cooling air duct 6, and the upper part of the middle furnace body 2 can be constructed with longer refractory bricks, so that the upper part of the inner wall of the middle furnace body 2 is in contact with the upper part of the outer wall of the inner furnace body 3, so that the cooling air duct 6 is closed on the side close to the top cover 12.

[0034] As a further option in this embodiment, in order to ensure that the outer surface of the phosphate rock hot-setting pelletizing device is more neat, the inner wall of the inner furnace body 3 and the outer wall of the outer furnace body 1 can be covered with steel plates 20, so that the inner wall of the inner furnace body 3 and the outer wall of the outer furnace body 1 are more beautiful when viewed; in addition, refractory wool can be filled between the steel plate 20 on the inner wall of the inner furnace body 3 and the outer wall of the inner furnace body 3, so as to play a role of heat insulation, and prevent the high temperature in the hot-setting chamber 5 from being transmitted to the inner furnace body 3 through the intermediate furnace body 2 and the inner furnace body 3, so as to ensure that the exhaust gas entering the inner furnace body 3 is not too high, so that the exhaust gas can be normally transported to the next process for desulfurization after being sent out through the smoke exhaust pipe 7.

[0035] As a further option in this embodiment, since the combustion chamber 4 and the heat setting chamber 5 in the utility model are both annular, in order to ensure that the phosphate ore concentrate pellets on the entire circumferential surface in the heat setting chamber 5 can be heat-set, the outer furnace body 1 is also provided with a plurality of burners 8 extending into the combustion chamber 4, and the plurality of burners 8 are evenly spaced along the circumferential direction of the outer furnace body 1. In order to ensure that there is sufficient oxygen in the combustion chamber 4 when the material is burned, an air duct for introducing air is also connected in parallel to the burner 8, and a blower is installed in the air duct. Specifically, the number of air ducts configured on each burner 8 is not limited, and can be one or two. When there are multiple air ducts configured on each burner 8, a blower is installed in each air duct.

[0036] As a further option in this embodiment, an operating platform 9 is set up around the combustion chamber 4 and the top of the outer furnace body 1, and a guardrail is set up around the operating platform 9; at the same time, in order to ensure the stability of the operating platform 9, the supporting platform is also equipped with an inclined support structure 11. In addition, in the present utility model, in order to make the built operating platform 9 more stable, the operating platform 9 corresponding to the combustion chamber 4 is supported separately by the column 10, and the other end of the inclined support structure 11 on the operating platform 9 corresponding to the combustion chamber 4 is fixed on the column 10; the operating platform 9 located on the top of the outer furnace body 1 supports the inclined support structure 11 on the combustion chamber 4, and in order to make the stability of the combustion chamber 4 better, the operating platform 9 corresponding to the combustion chamber 4 also supports the combustion chamber 4.

[0037] As a further option in this embodiment, on the one hand, in order to prevent the flame generated in the combustion chamber 4 from directly acting on the phosphate rock concentrate pellets in the combustion chamber 4, causing the phosphate rock concentrate pellets to burst due to excessive temperature, and on the other hand, in order to prevent the phosphate rock concentrate pellets in the combustion chamber 4 from entering the combustion chamber 4 and affecting the combustion of materials, in the utility model, a fire baffle 17 is provided on the side of the combustion chamber 4 close to the thermosetting chamber 5, and a certain distance is provided between the top of the fire baffle 17 and the top of the combustion chamber 4, that is, it can ensure that the high-temperature flue gas generated by the material in the combustion chamber 4 after full combustion can pass through the gap between the top of the fire baffle 17 and the top of the combustion chamber 4 into the thermosetting chamber 5 to thermoset the phosphate rock concentrate pellets, and effectively prevent the flame generated by the material in the combustion chamber 4 during the combustion process from directly acting on the phosphate rock concentrate pellets, so that the quality of the thermosetting phosphate rock concentrate pellets is better.

[0038] As a further option in the present embodiment, in order to prevent the phosphate rock concentrate pellets in the thermosetting chamber 5 from entering the cooling air duct 6 through the vent 15, a baffle plate 16 can also be provided in the vent 15, and a certain distance can be provided between the top of the baffle plate 16 and the top of the vent 15 to ensure that the cooling air in the cooling air duct 6 can enter the thermosetting chamber 5 through the distance between the top of the baffle plate 16 and the top of the vent 15, so that the phosphate rock concentrate pellets in the cooling section of the thermosetting chamber 5 can be effectively cooled.

[0039] As a further option in this embodiment, in order to ensure that the phosphate ore concentrate pellets delivered by the lower hopper 13 can accurately enter the thermosetting chamber 5, the lower hopper 13 can be designed so that the lower hopper 13 is in a sinking structure on the top cover 12. Specifically, the feed end of the lower hopper 13 is flush with the upper surface of the top cover 12, and the discharge end of the lower hopper 13 passes through the lower surface of the top cover 12 and continues to extend downward. In the utility model, after the top cover 12 is installed, the discharge end of the lower hopper 13 extends into the thermosetting chamber 5, so that the phosphate ore concentrate pellets delivered by the lower hopper 13 directly enter the thermosetting chamber 5. In the utility model, since the outlet end of the lower hopper 13 is in a suspended state for a long time, in order to make the structure of the lower hopper 13 more stable, a rib plate 14 can also be fixedly connected between the inner wall of the top cover 12 and the lower hopper 13.

[0040] As a further option in this embodiment, when designing the phosphate rock powder thermal setting pelletizing device, in order to facilitate the arrangement of the smoke exhaust pipe 7 and the delivery of the thermally set phosphate rock concentrate pellets from the discharge port 18, a building base can be first set up, and then the inner furnace body 3, the middle furnace body 2, the outer furnace body 1 and the smoke exhaust pipe 7 can be installed on the building base, so that the position of the discharge port 18 is higher than the horizontal plane, so that when the discharge port 18 is opened, the cooled phosphate rock concentrate pellets in the combustion chamber 4 can be more easily discharged from the discharge port 18.

[0041] As a further option in this embodiment, in order to allow the smoke generated by the phosphate rock concentrate pellets during the thermal solidification process to be smoothly discharged through the smoke exhaust pipe 7, an exhaust fan is also installed in the smoke exhaust pipe 7. Specifically, the exhaust fan can be installed on the building base, and the inlet end of the smoke exhaust pipe 7 is connected to the outlet of the exhaust fan.

[0042] As a further option in this embodiment, a discharge guide plate 19 is further provided on the outer furnace body 1, and the inner end of the discharge guide plate 19 is fixed at the bottom of the heat curing chamber 5, and the outer end of the discharge guide plate 19 passes through the discharge port 18 and then extends obliquely downward. When the heat-cured and cooled phosphate rock concentrate pellets need to be discharged from the discharge port 18, auxiliary tools can be used to directly hook them out from the discharge port 18, or the phosphate rock concentrate pellets can be discharged from the discharge port 18 by their own gravity.

[0043] When the utility model is used for the first time, the multiple discharge ports 18 are closed, and slag is first fed into the cooling section of the combustion chamber 4 through the lower hopper 13, and then the phosphate rock powder pellets are fed into the high temperature section and the preheating section of the combustion chamber 4 through the lower hopper 13. When the combustion chamber 4 is filled, the multiple discharge ports are opened and the exhaust fan is started; then, the tail gas that can be used as fuel is fed into the combustion chamber 4 and ignited through the burner 8, and combustion is carried out in the combustion chamber 4. The high-temperature flue gas generated by the combustion enters the high-temperature section of the combustion chamber 4 through the gap between the upper end of the fire baffle 17 and the top of the combustion chamber 4. The high-temperature flue gas heat-fixes the phosphate rock powder pellets in the high-temperature section, and the flue gas after heat-fixing the phosphate rock powder pellets in the high-temperature section enters the preheating section, so that the flue gas in the preheating section The phosphate rock powder pellets are preheated, and a part of the flue gas after preheating enters the inner furnace body 3 through the gap between the upper end of the intermediate furnace body 2 and the top cover 12, and the gap between the upper end of the inner furnace body 3 and the top cover 12. The flue gas entering the inner furnace body 3 is transported to the desulfurization equipment through the exhaust pipe 7, and another part of the flue gas preheated from the phosphate rock powder pellets in the preheating section enters the cooling air duct 6, and enters the cooling section of the combustion chamber 4 through the cooling air duct 6 to cool the slag in the cooling section. In this process, the temperature of the high temperature section is thermoset at 700℃-850℃ for 2 hours, and the temperature of the preheating section is preheated at 700℃-200℃ for 4 hours. The flue gas temperature after preheating the phosphate rock powder pellets is lower than 300℃, and the temperature of the phosphate rock powder pellets after cooling is 40℃-60℃.

[0044] When the phosphate rock concentrate pellets in the high temperature section of the combustion chamber 4 are thermally solidified, the discharge port is opened, and the slag in the cooling section is sent out through the discharge port. During the process of the slag being sent out, the phosphate rock concentrate pellets in the high temperature section will automatically enter the cooling section by gravity, and in this process, the phosphate rock concentrate pellets will continue to be fed into the preheating section of the combustion chamber 4 through the discharge hopper 13; when all the slag in the cooling section is discharged, the discharge port 18 is closed, and the thermal solidification is carried out for 3 hours, and this is repeated.

[0045] In the process of heat-setting the phosphate ore concentrate pellets, the pressure in the inner furnace body 3 is lower than the pressure in the combustion chamber by the suction of the exhaust fan. The flue gas in the heat-setting chamber 5 enters the inner furnace body 3 by the negative pressure. In this process, the high-temperature flue gas generated during the combustion process in the combustion chamber 4 enters the high-temperature section of the heat-setting chamber 5. During the heat-setting process of the phosphate ore concentrate pellets in the high-temperature section of the heat-setting chamber 5, a part of the high-temperature flue gas directly moves upward to the preheating section of the heat-setting chamber 5 to preheat the phosphate ore concentrate pellets. The other part enters the cooling air duct 6 through the vent 15, and moves directly upward along the cooling air duct 6, and finally enters the preheating section of the heat-setting chamber 5 from the vent 15 at the upper end of the cooling air duct 6 to preheat the phosphate rock concentrate pellets. After the preheating of the phosphate rock concentrate pellets, the flue gas enters the inner furnace body 3 through the gap between the upper end of the middle furnace body 2 and the top cover 12, and the gap between the upper end of the inner furnace body 3 and the top cover 12. The flue gas entering the inner furnace body 3 is transported to the desulfurization equipment through the exhaust pipe 7.

[0046] During the process of heat-setting the phosphate rock concentrate pellets, since the discharge port 18 is always kept open, the cold air from the outside can enter the cooling section of the heat-setting chamber 5 through the discharge port 18. Since the high-temperature flue gas generated during the combustion process in the combustion chamber 4 enters the high-temperature section of the heat-setting chamber 5, the air pressure in the high-temperature section of the heat-setting chamber 5 is greater than the air pressure in the cooling section of the heat-setting chamber 5. Therefore, the cooling air entering the cooling section of the heat-setting chamber 5 cannot enter the high-temperature section of the heat-setting chamber 5. After the cooling air entering the cooling section of the heat-setting chamber 5 cools the phosphate rock concentrate pellets after heat-setting, the cooling air directly enters the cooling air duct 6 through the vent 15 and moves upward along the cooling air duct 6. When the cooling air enters the height corresponding to the high-temperature section of the heat-setting chamber 5, the cooling air will enter the cooling air duct 6 directly through the vent 15 and move upward along the cooling air duct 6. At this time, the cold air entering the cooling air duct 6 is mixed with the hot air entering the cooling air duct 6 from the high temperature section of the thermosetting chamber 5 to form low-temperature air. The low-temperature air continues to move upward along the cooling air duct 6, and finally enters the upper part of the preheating section of the thermosetting chamber 5 from the vent 15 at the upper end of the cooling air duct 6. At this time, the low-temperature air entering the upper part of the preheating section of the thermosetting chamber 5 is mixed with the flue gas after preheating the phosphate rock concentrate pellets, so that the low-temperature air can cool down the high-temperature flue gas after preheating the phosphate rock concentrate pellets, and the flue gas after cooling enters the inner furnace body 3 through the gap between the upper end of the middle furnace body 2 and the top cover 12, and the gap between the upper end of the inner furnace body 3 and the top cover 12. The flue gas entering the inner furnace body 3 is transported to the desulfurization equipment through the exhaust pipe 7. During this process, the temperature of the cold air entering through the discharge port 18 is 35℃-50℃, and the temperature of the cold air entering the cooling duct 6 after cooling the phosphate rock concentrate pellets in the cooling section of the thermosetting chamber 5 is 70℃-80℃. The temperature of the cooling air in the cooling duct 6 and the hot air entering the cooling duct 6 from the high temperature section of the thermosetting chamber 5 after mixing is 100℃-150℃. The temperature of the mixed air after being discharged through the vent 15 at the top of the cooling duct 6 and mixed with the flue gas after preheating the phosphate rock concentrate pellets is 170℃-200℃, that is, the temperature of the flue gas finally discharged through the exhaust pipe 7 is 170℃-200℃. When the exhausted flue gas is transported to the desulfurization equipment, the temperature entering the desulfurization equipment is lower than 170℃, which meets the working requirements of the desulfurization equipment.

[0047] The utility model can continuously perform thermal solidification on phosphate rock concentrate pellets.

[0048] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A device for thermally solidifying phosphate rock into balls, characterized in that: The invention comprises an inner furnace body (3), an intermediate furnace body (2) and an outer furnace body (1) which are arranged concentrically and radially at intervals, a heat curing chamber (5) is formed between the outer furnace body (1) and the intermediate furnace body (2), a cooling air duct (6) is formed between the intermediate furnace body (2) and the inner furnace body (3), a plurality of discharge ports (18) are provided at the bottom of the outer furnace body (1), and a plurality of ventilation ports (15) for connecting the cooling air duct (6) and the heat curing chamber (5) are provided on the intermediate furnace body (2); the inner furnace body (3), the intermediate furnace body (2) and the outer furnace body (1) are jointly covered with a top cover (12), and a plurality of lower hoppers (13) are provided on the top cover (12) which are connected to the heat curing chamber (5); the invention also comprises a smoke exhaust pipe (7) which is connected to the interior of the inner furnace body (3), and a combustion chamber (4) which is connected to the heat curing chamber (5) is provided on the outer furnace body (1).

2. The phosphate rock powder thermal solidification ball forming device according to claim 1, characterized in that: The inner furnace body (3), the middle furnace body (2), the outer furnace body (1) and the combustion chamber (4) are all constructed of refractory bricks.

3. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, characterized in that: The inner wall of the inner furnace body (3) and the outer wall of the outer furnace body (1) are both covered with steel plates (20), and refractory wool is also filled between the steel plates (20) on the inner wall of the inner furnace body (3) and the outer wall of the inner furnace body (3).

4. The phosphate rock powder thermal solidification ball forming device according to claim 1, 2 or 3, characterized in that: The outer furnace body (1) is also provided with a plurality of burners (8), and the plurality of burners (8) are evenly spaced apart along the circumferential direction of the outer furnace body (1).

5. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, 2 or 3, characterized in that: An operating platform (9) is provided on the periphery of the combustion chamber (4) and the periphery of the top of the outer furnace body (1).

6. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, 2 or 3, characterized in that: A fire-blocking wall (17) is provided on one side of the combustion chamber (4) close to the heat-curing chamber (5).

7. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, 2 or 3, characterized in that: A material blocking plate (16) is also provided in the ventilation opening (15).

8. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, characterized in that: The lower hopper (13) is a sunken structure on the top cover (12), and the discharge end of the lower hopper (13) extends into the thermosetting chamber (5).

9. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, 2 or 3, characterized in that: The plurality of lower hoppers (13) and the plurality of discharge ports (18) are evenly spaced and arranged along the circumferential direction of the heat curing chamber (5).

10. The device for thermally solidifying phosphate rock powder into pellets according to claim 1, 2 or 3, characterized in that: The outer furnace body (1) is also provided with a discharge guide plate (19), the inner end of the discharge guide plate (19) is fixed to the bottom of the thermosetting chamber (5), and the outer end of the discharge guide plate (19) passes through the discharge port (18) and then extends obliquely downward.

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