Phosphogypsum calcining device

Abstract

The invention provides an ardealite calcining device. The ardealite calcining device comprises a distribution bin, a calcining bin and a discharging bin which are sequentially connected in the height direction. The distribution bin comprises a feeding port and a plurality of distribution cavities, the feeding port communicates with the multiple distribution cavities, and the multiple distribution cavities communicate with the calcining bin; a flue gas inlet and a flue gas outlet are formed in the two side walls of the calcining bin in the length direction respectively, the flue gas inlet is communicated with a calcining kiln high-temperature flue gas channel, a plurality of calcining channels are formed in the calcining bin, each distribution cavity corresponds to at least one calcining channel, one end of each calcining channel is communicated with the corresponding distribution cavity, and the other end of each calcining channel is communicated with the corresponding distribution cavity. The other end of each calcining channel is communicated with the discharging bin; a flue gas channel corresponding to the outside of the calcining channel is further arranged in the calcining bin, and high-temperature flue gas entering the calcining bin through the flue gas inlet flows to the flue gas outlet along the flue gas channel. According to the invention, multi-channel calcination of ardealite can be realized, the heat exchange area of ardealite and high-temperature flue gas is increased, and the waste heat utilization rate of the high-temperature flue gas and the calcination efficiency of ardealite are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphogypsum processing, and particularly relates to a phosphogypsum calcining device. BACKGROUND

[0002] Phosphogypsum is a solid waste produced in the wet-process phosphoric acid process, has a wide application field and a complex composition, is generally gray-black or gray-white, and has a wide application prospect in building materials, agriculture, environmental governance and other fields as an industrial solid waste. Through reasonable pretreatment and comprehensive utilization technology, the win-win of resource utilization and environmental protection of phosphogypsum can be effectively realized. The pretreatment process of phosphogypsum includes water washing purification, flotation, high-temperature calcination, lime neutralization, ball milling and screening, and aging treatment, and the high-temperature calcination is one of the most effective methods for removing the eutectic phosphorus impurities in phosphogypsum.

[0003] The ceramic particle calcining kiln generates flue gas during calcination. The flue gas discharged from the ceramic particle calcining kiln generally needs to be first subjected to dust removal treatment in a smoke chamber, and then subjected to flue gas dust removal and flue gas purification treatment in a bag-type dust collector before being discharged into the atmosphere. The bag-type dust collector requires that the temperature of the entering flue gas does not exceed 200 DEG C. However, the temperature of the high-temperature flue gas after dust removal in the smoke chamber is still as high as 250 DEG C-550 DEG C. The high-temperature flue gas directly entering the bag-type dust collector will damage the bag-type dust collector, and the waste heat of the high-temperature flue gas will also be wasted.

[0004] Therefore, how to effectively combine the high-temperature flue gas treatment of the calcining kiln with the high-temperature calcination of phosphogypsum to realize the maximum utilization of resources has become the research focus in the field. SUMMARY

[0005] The present application provides a phosphogypsum calcining device, which aims to effectively combine the high-temperature flue gas treatment of the calcining kiln with the high-temperature calcination of phosphogypsum to realize the waste heat utilization of the high-temperature flue gas and improve the calcination efficiency of phosphogypsum.

[0006] The present application provides a phosphogypsum calcining device, which is used for communicating with a high-temperature flue gas passage of a calcining kiln, and includes a distribution bin, a calcining bin and a discharge bin connected in sequence in the height direction. The distribution bin includes a feeding port and a plurality of distribution cavities, the feeding port is respectively communicated with the plurality of distribution cavities, and the plurality of distribution cavities are all communicated with the calcining bin. The calcination bin is provided with a flue gas inlet and a flue gas outlet on two side walls in the length direction respectively, the flue gas inlet is communicated with the high-temperature flue gas passage of the calcination kiln, the calcination bin is provided with a plurality of calcination passages, each distribution cavity corresponds to at least one calcination passage, one end of each calcination passage is communicated with the corresponding distribution cavity, and the other end of each calcination passage is communicated with the discharge bin; the calcination bin is further provided with a flue gas passage corresponding to the calcination passages, and the high-temperature flue gas entering the calcination bin through the flue gas inlet flows to the flue gas outlet along the flue gas passage.

[0007] The phosphogypsum calcination device provided by the application further comprises an impurity collecting bin, the impurity collecting bin and the discharge bin are located on the side of the calcination bin away from the distribution bin, the impurity collecting bin and the discharge bin are independent of each other, the calcination passages and the flue gas passages are independent of each other, and the flue gas passage is communicated with the impurity collecting bin.

[0008] The phosphogypsum calcination device provided by the application is provided with a plurality of dust-settling partitions arranged in the height direction in the calcination bin, the plurality of dust-settling partitions are arranged at intervals in the length direction and correspond to the plurality of distribution cavities one by one, at least one calcination passage is arranged in the interior of each dust-settling partition, at least one flue gas through hole is arranged on each dust-settling partition, the flue gas through hole and the calcination passage are independent of each other, the flue gas through holes on two adjacent dust-settling partitions are arranged alternately, and the high-temperature flue gas entering through the flue gas inlet flows to the flue gas outlet in sequence through the plurality of flue gas through holes in the length direction.

[0009] The dust-settling partition is a comb-shaped structure, at least two dust-settling combs are arranged in the width direction, the flue gas through hole is formed between two adjacent dust-settling combs and / or between the dust-settling comb and the inner wall of the calcination bin, and the interior of each dust-settling comb is constructed with a calcination passage.

[0010] In each dust-settling partition, the ends of the at least two dust-settling combs close to the distribution bin are connected to each other, the ends of the at least two dust-settling combs away from the distribution bin are separated from each other, and the opening of the calcination passage close to the distribution bin is larger than the opening of the calcination passage close to the discharge bin.

[0011] The phosphogypsum calcining device provided by the present application, a part of the impurity collecting bin is embedded in the discharge bin, and a gap exists between the part of the impurity collecting bin embedded in the discharge bin and the inner wall of the discharge bin, the plurality of dust falling combs includes a first dust falling comb corresponding to the impurity collecting bin, the first dust falling comb extends into the impurity collecting bin and is connected with the side wall of the impurity collecting bin, a plurality of first communication holes are arranged on the side wall of the impurity collecting bin, and each calcining channel on the first dust falling comb communicates with the discharge bin through a first communication hole.

[0012] The phosphogypsum calcining device provided by the present application, the bin body of the calcining bin includes an inner shell and an outer shell, the inner shell is nested in the outer shell, and an annular cavity is arranged between the inner shell and the outer shell, the end face of the inner shell away from the distribution bin is connected with the end face of the impurity collecting bin close to the distribution bin, the end face of the outer shell away from the distribution bin is connected with the end face of the discharge bin close to the distribution bin, the cavity communicates with the discharge bin, and part of the first dust falling comb is formed by inwardly recessing the side wall of the inner shell.

[0013] The phosphogypsum calcining device provided by the present application, the bin body of the calcining bin includes an inner shell and an outer shell, the inner shell is nested in the outer shell, and an annular cavity is arranged between the inner shell and the outer shell, the end face of the inner shell away from the distribution bin is connected with the end face of the impurity collecting bin close to the distribution bin, the end face of the outer shell away from the distribution bin is connected with the end face of the discharge bin close to the distribution bin, the cavity communicates with the discharge bin, and part of the first dust falling comb is formed by inwardly recessing the side wall of the inner shell.

[0014] The phosphogypsum calcining device provided by the present application, the bin body of the calcining bin includes an inner shell and an outer shell, the inner shell is nested in the outer shell, and an annular cavity is arranged between the inner shell and the outer shell, the end face of the inner shell away from the distribution bin is connected with the end face of the impurity collecting bin close to the distribution bin, the end face of the outer shell away from the distribution bin is connected with the end face of the discharge bin close to the distribution bin, the cavity communicates with the discharge bin, and part of the first dust falling comb is formed by inwardly recessing the side wall of the inner shell.

[0015] The phosphogypsum calcining device provided by the present application, a plurality of distribution partitions are arranged in the distribution bin, the plurality of distribution partitions are arranged at intervals along the length direction, both side walls of each distribution partition in the width direction are connected with the inner wall of the distribution bin, and the plurality of distribution partitions are used for separating the inner part of the distribution bin into a plurality of independent distribution cavities.

[0016] The above technical scheme of the present application has the following beneficial effects: The phosphogypsum calcination apparatus provided by this invention connects the feed inlet of the calcination apparatus to multiple distribution chambers, each of which is connected to a calcination chamber. Multiple calcination channels are set within the calcination chamber, with each distribution chamber corresponding to at least one calcination channel. One end of each calcination channel is connected to the corresponding distribution chamber, and the other end is connected to the discharge chamber. Phosphogypsum is distributed from the feed inlet to the multiple distribution chambers, and then from these chambers to the multiple calcination channels to be calcined simultaneously by the high-temperature flue gas in the calcination chamber. This achieves multi-channel calcination of phosphogypsum, expanding the heat exchange area between the high-temperature gas and phosphogypsum from a single channel to a three-dimensional network. This increases the heat exchange area between the phosphogypsum and the high-temperature flue gas, effectively improving the waste heat utilization rate of the high-temperature flue gas and the calcination efficiency of the phosphogypsum. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a front view of the phosphogypsum calcination apparatus provided in an embodiment of the present invention; Figure 2 This is a left view of the phosphogypsum calcination apparatus provided in an embodiment of the present invention; Figure 3 This is a right view of the phosphogypsum calcination apparatus provided in an embodiment of the present invention; Figure 4 A partial cross-sectional view of the phosphogypsum calcination apparatus provided in an embodiment of the present invention along its length. Figure 5 This is one of the partial structural schematic diagrams of the phosphogypsum calcination apparatus provided in an embodiment of the present invention; Figure 6 This is a second partial structural schematic diagram of the phosphogypsum calcination apparatus provided in an embodiment of the present invention; Figure 7 A partial cross-sectional view of the phosphogypsum calcination apparatus provided in an embodiment of the present invention in the width direction; Figure 8 One of the partial structural cross-sectional views of the phosphogypsum calcination apparatus provided in the embodiment of the present invention in the height direction; Figure 9 This is a second partial structural cross-sectional view of the phosphogypsum calcination apparatus provided in an embodiment of the present invention, in the height direction. Figure 10 The third partial structural cross-sectional view of the phosphogypsum calcination apparatus provided in the embodiment of the present invention in the height direction; Figure 11The bottom view of the phosphogypsum calcining device provided by the embodiment of the present application is shown in the figure. Figure 12 The structure diagram of the distribution bin of the phosphogypsum calcining device provided by the embodiment of the present application is shown in the figure.

[0019] Reference signs: 1, distribution bin; 2, calcining bin; 3, discharge bin; 4, impurity collection bin; 101, feeding port; 102, distribution cavity; 103, distribution partition; 201, flue gas inlet; 202, flue gas outlet; 203, calcining channel; 204, flue gas channel; 205, dust falling partition; 2051, flue gas through hole; 2052, dust falling comb tooth; 2052A, first dust falling comb tooth; 2052B, second dust falling comb tooth; 206, inner shell; 207, outer shell; 208, cavity; 401, first communication hole; 402, second communication hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] Please refer to Figures 1-5 The present application provides a phosphogypsum calcining device for communicating with a calcining kiln high-temperature flue gas channel. The calcining device comprises a distribution bin 1, a calcining bin 2 and a discharge bin 3 connected in sequence in the height direction. Phosphogypsum enters the calcining bin 2 through the distribution bin 1 for calcination, and then enters the discharge bin 3 for discharge after calcination.

[0022] The distribution bin 1 is used for distributing phosphogypsum and comprises a feeding port 101 and a plurality of distribution cavities 102. The feeding port 101 communicates with the plurality of distribution cavities 102 respectively, and the plurality of distribution cavities 102 all communicate with the calcining bin 2. Phosphogypsum is evenly distributed into the plurality of distribution cavities 102 through the feeding port 101.

[0023] The calcining device further comprises an impurity collecting bin 4. The impurity collecting bin 4 and the discharge bin 3 are both located on the side of the calcining bin 2 away from the distribution bin 1. The impurity collecting bin 4 is used for collecting the impurity particles carried by the high-temperature flue gas. The calcining channel 203 and the flue gas channel 204 are independent of each other. The calcining channel 203 is communicated with the discharge bin 3, and the flue gas channel 204 is communicated with the impurity collecting bin 4. Since the plurality of calcining channels 203 in the calcining bin 2 form a three-dimensional network structure, part of the dust and other impurities in the high-temperature flue gas can be blocked. The blocked part of the dust and other impurities falls into the impurity collecting bin 4 under the action of gravity, so that the high-temperature flue gas is purified.

[0024] Since the phosphogypsum is simultaneously distributed into the plurality of distribution cavities 102 through the feeding port 101 and then simultaneously distributed into the plurality of calcining channels 203 through the plurality of distribution cavities 102, the multi-channel calcining of the phosphogypsum can be realized. The heat exchange area of the high-temperature gas and the phosphogypsum is expanded from a single channel to a three-dimensional network. The heat exchange area of the phosphogypsum and the high-temperature flue gas is increased. The waste heat utilization rate of the high-temperature flue gas and the calcining efficiency of the phosphogypsum are effectively improved.

[0025] Further, the calcining device further comprises an impurity collecting bin 4. The impurity collecting bin 4 and the discharge bin 3 are both located on the side of the calcining bin 2 away from the distribution bin 1. The impurity collecting bin 4 is used for collecting the impurity particles carried by the high-temperature flue gas. The calcining channel 203 and the flue gas channel 204 are independent of each other. The calcining channel 203 is communicated with the discharge bin 3, and the flue gas channel 204 is communicated with the impurity collecting bin 4. Since the plurality of calcining channels 203 in the calcining bin 2 form a three-dimensional network structure, part of the dust and other impurities in the high-temperature flue gas can be blocked. The blocked part of the dust and other impurities falls into the impurity collecting bin 4 under the action of gravity, so that the high-temperature flue gas is purified.

[0026] Please refer to Figures 4-6Specifically, the calcination bin 2 is provided with a plurality of dust-settling partitions 205 arranged along the height direction of the calcination device, and the plurality of dust-settling partitions 205 are arranged along the length direction of the calcination device and correspond to the plurality of distribution cavities 102 one by one. The inside of each dust-settling partition 205 is provided with at least one calcination channel 203, and each dust-settling partition 205 is provided with at least one flue gas through hole 2051, the flue gas through hole 2051 penetrates the dust-settling partition 205 along the length direction of the calcination device, the flue gas through hole 2051 and the calcination channel 203 are independent of each other, and the high-temperature flue gas entering through the flue gas inlet 201 flows to the flue gas outlet 202 in sequence through the plurality of flue gas through holes 2051 along the length direction. In this way, the flowability of the high-temperature flue gas can be ensured, and the high-temperature flue gas can be sequentially heat-exchanged with the plurality of dust-settling partitions 205, thereby improving the utilization rate of the waste heat of the high-temperature flue gas and the calcination efficiency. At the same time, the dust and impurities in the high-temperature flue gas are effectively removed through the multi-stage blocking of the plurality of dust-settling partitions 205.

[0027] Further, the flue gas through holes 2051 on the adjacent two dust-settling partitions 205 are staggered arranged, on the one hand, the flow path of the high-temperature flue gas is prolonged, the high-temperature flue gas is fully heat-exchanged with the phosphogypsum in the calcination channel 203, and the utilization rate of the waste heat of the high-temperature flue gas and the calcination efficiency are improved; on the other hand, the staggered arrangement of the flue gas through holes 2051 can make most of the impurities in the high-temperature flue gas be effectively blocked by the dust-settling partitions 205, so that the impurities quickly fall, and the high-temperature flue gas entering the subsequent operation is more purified.

[0028] Specifically, the dust-settling partition 205 is a comb-shaped structure, including at least two dust-settling combs 2052 arranged along the width direction, the flue gas through hole 2051 is formed between the adjacent two dust-settling combs 2052 and / or between the dust-settling comb 2052 and the inner wall of the calcination bin 2, and the inside of each dust-settling comb 2052 is constructed with a calcination channel 203.

[0029] Specifically, the dust-settling partition 205 is a comb-shaped structure, including at least two dust-settling combs 2052 arranged along the width direction, the flue gas through hole 2051 is formed between the adjacent two dust-settling combs 2052 and / or between the dust-settling comb 2052 and the inner wall of the calcination bin 2, and the inside of each dust-settling comb 2052 is constructed with a calcination channel 203.

[0030] Please refer to Figures 4-7 In each dust-settling partition 205, all the dust-settling combs 2052 are connected to each other at one end close to the distribution bin 1, and all the dust-settling combs 2052. Among them, the opening of the calcination channel 203 close to one end of the distribution bin 1 is larger than the opening close to one end of the discharge bin 3, that is, the end of the calcination channel 203 close to the distribution bin 1 is trumpet-shaped, so that the phosphogypsum in the distribution cavity 102 can smoothly enter each calcination channel 203 corresponding to the distribution cavity 102. The dust-settling partition 205 is designed in this way, which can not only ensure that the phosphogypsum smoothly enters each calcination channel 203, but also ensure the flowability of high-temperature flue gas.

[0031] Please refer to Figure 7 、 Figure 8 and Figure 10 , a part of the impurity collection bin 4 is embedded in the discharge bin 3, and there is a gap between the part of the impurity collection bin 4 embedded in the discharge bin 3 and the inner wall of the discharge bin 3. The plurality of dust-settling combs 2052 includes a first dust-settling comb 2052A corresponding to the impurity collection bin 4, one end of the first dust-settling comb 2052A extends into the impurity collection bin 4 and is connected to the side wall of the impurity collection bin 4. A plurality of first communication holes 401 are provided on the side wall of the impurity collection bin 4, and each calcination channel 203 on the first dust-settling comb 2052A communicates with the discharge bin 3 through one first communication hole 401. The calcination device is designed in this way, which can ensure that the dusting of high-temperature flue gas and the calcination of phosphogypsum do not affect each other.

[0032] It should be noted that the end of the first dust-settling comb 2052A close to the discharge bin 3 can also be bifurcated to form two or more calcination channel branches, and each calcination channel branch can communicate with the discharge bin 3 through one first communication hole 401.

[0033] Among them, the shape of the impurity collection bin 4 is funnel-shaped, and the opening of the end close to the distribution bin 1 is larger than the opening of the end away from the distribution bin 1, and the outlet of the impurity collection bin 4 is located outside the discharge bin 3. Such a structural design is convenient for dust and impurities to gather at the outlet of the impurity collection bin 4 along the slope of the funnel shape.

[0034] Please refer to Figures 7-9 , the bin body of the calcination bin 2 includes an inner shell 206 and an outer shell 207, the inner shell 206 is nested in the outer shell 207, and an annular cavity 208 is provided between the inner shell 206 and the outer shell 207. The end face of the inner shell 206 away from the distribution bin 1 is sealingly connected to the end face of the impurity collection bin 4 close to the distribution bin 1, the end face of the outer shell 207 away from the distribution bin 1 is sealingly connected to the end face of the discharge bin 3 close to the distribution bin 1, and the cavity 208 communicates with the discharge bin 3. In this way, the dusting function of the flue gas channel to the impurity collection bin 4 and the calcination function of the calcination channel to the discharge bin 3 are independent of each other and do not interfere with each other.

[0035] Part of the first dust-reducing comb teeth 2052A is formed by inwardly recessing the side wall of the inner shell 206, thereby reducing production cost.

[0036] Referring to Figures 9-11 Further, the calcining device comprises two impurity collection bins 4 arranged opposite to each other in the length direction, and the plurality of dust-reducing comb teeth 2052 further comprises second dust-reducing comb teeth 2052B located between the two impurity collection bins 4, and the side wall of the inner shell 206 is provided with a plurality of second communication holes 402, and each calcining channel 203 on the second dust-reducing comb teeth 2052B is communicated with the discharge bin 3 through a second communication hole 402 via the cavity.

[0037] Further, the inner shell 206, the impurity collection bin 4, the discharge bin 3 and the dust-reducing comb teeth 2052 can be integrally formed by a molding process.

[0038] Referring to Figure 4 and Figure 12 The distribution bin 1 is provided with a plurality of distribution partitions 103, and the plurality of distribution partitions 103 are arranged spaced apart in the length direction, and the two side walls of each distribution partition 103 in the width direction are connected with the inner wall of the distribution bin 1, and the plurality of distribution partitions 103 are used for separating the inside of the distribution bin 1 into a plurality of independent distribution cavities 102.

[0039] It should be noted that the number of distribution partitions 103 is not limited by the present application, as long as the distribution cavities 102 corresponding to the number of dust-reducing partitions 205 are formed by reasonable arrangement.

[0040] The lower edges of the two distribution partitions 103 corresponding to the distribution cavity 102 vertically arranged directly below the feed inlet 101 are both overlapped with the edges of the upper end opening of the corresponding calcining channel 203, so as to ensure that the phosphogypsum entering the distribution cavity 102 falls smoothly into the corresponding calcining channel 203. Among the distribution partitions 103 corresponding to the distribution cavities 102 arranged obliquely on the opposite sides of the feed inlet 101, the lower edge of at least the distribution partition 103 close to the center side of the distribution bin 1 is overlapped with the edge of the upper end opening of the corresponding calcining channel 203, so as to ensure that the phosphogypsum falls smoothly into the corresponding calcining channel 203 under the action of gravity.

[0041] The phosphogypsum calcining device provided by the application, by setting multiple distribution cavities and dust falling partitions corresponding to the multiple distribution cavities, at least one calcining channel is formed in each dust falling partition, multi-channel calcining of the phosphogypsum is realized, the heat exchange area of the high-temperature gas and the phosphogypsum is expanded from a single channel to a three-dimensional network, the heat exchange area of the phosphogypsum and the high-temperature flue gas is increased, and the waste heat utilization rate of the high-temperature flue gas and the calcining efficiency of the phosphogypsum are effectively improved. And through the design of the structure and positional relationship of the calcining bin, the impurity collecting bin and the discharge bin, the dust removal function of the flue gas channel to the impurity collecting bin and the calcining function of the calcining channel to the discharge bin are independent of each other and do not interfere with each other, the high-temperature flue gas treatment of the calcining kiln and the high-temperature calcining of the phosphogypsum are effectively combined, and the maximum utilization of resources is realized.

[0042] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A phosphogypsum calcining device, characterized by, The application relates to a calcination kiln high-temperature flue gas passage communication device. The distribution bin comprises a feeding port and a plurality of distribution cavities, the feeding port is communicated with the plurality of distribution cavities respectively, and the plurality of distribution cavities are communicated with the calcination bin. The calcination bin is provided with a flue gas inlet and a flue gas outlet on two side walls in the length direction respectively, the flue gas inlet is communicated with the calcination kiln high-temperature flue gas passage, the calcination bin is provided with a plurality of calcination channels, each distribution cavity corresponds to at least one calcination channel, one end of each calcination channel is communicated with the corresponding distribution cavity, and the other end of each calcination channel is communicated with the discharge bin; the calcination bin is further provided with a flue gas channel corresponding to the calcination channels, and high-temperature flue gas entering the calcination bin through the flue gas inlet flows to the flue gas outlet along the flue gas channel.

2. The phosphogypsum calcining device according to claim 1, characterized in that, The device further comprises an impurity collecting bin, the impurity collecting bin and the discharge bin are located on the side of the calcination bin away from the distribution bin, the impurity collecting bin and the discharge bin are independent of each other, the calcination channels and the flue gas channels are independent of each other, and the flue gas channel is communicated with the impurity collecting bin.

3. The phosphogypsum calcining device of claim 2, wherein, The calcination bin is provided with a plurality of dust-settling partitions arranged in the height direction, the plurality of dust-settling partitions are arranged at intervals in the length direction and correspond to the plurality of distribution cavities one by one, the inside of each dust-settling partition is provided with at least one calcination channel, at least one flue gas through hole is arranged on each dust-settling partition, the flue gas through hole and the calcination channel are independent of each other, the flue gas through holes on adjacent two dust-settling partitions are arranged alternately, and high-temperature flue gas entering through the flue gas inlet flows to the flue gas outlet in sequence through the plurality of flue gas through holes in the length direction.

4. The phosphogypsum calcining device of claim 3, wherein, The dust-settling partition is a comb-tooth structure, comprising at least two dust-settling combs arranged in the width direction, the flue gas through hole is formed between adjacent two dust-settling combs and / or between the dust-settling comb and the inner wall of the calcination bin, and the inside of each dust-settling comb is constructed as a calcination channel.

5. The phosphogypsum calcining device of claim 4, wherein, In each dust-settling partition, at least two dust-settling combs are connected to each other at one end close to the distribution bin, at least two dust-settling combs are separated from each other at one end away from the distribution bin, and the opening of the calcination channel close to the distribution bin is larger than the opening of the calcination channel close to the discharge bin.

6. The phosphogypsum calcining device of claim 4, wherein, Part of the impurity collecting bin is embedded in the discharge bin, and a gap exists between the part of the impurity collecting bin embedded in the discharge bin and the inner wall of the discharge bin, the plurality of dust-settling combs comprise a first dust-settling comb corresponding to the impurity collecting bin, the first dust-settling comb extends into the impurity collecting bin and is connected with the side wall of the impurity collecting bin, a plurality of first communication holes are arranged on the side wall of the impurity collecting bin, and each calcination channel on the first dust-settling comb is communicated with the discharge bin through a first communication hole.

7. The phosphogypsum calcining device of claim 6, wherein, The inner shell is nested in the outer shell, and an annular cavity is arranged between the inner shell and the outer shell, an end face of the inner shell away from the distribution bin is connected with an end face of the impurity collection bin close to the distribution bin, an end face of the outer shell away from the distribution bin is connected with an end face of the discharge bin close to the distribution bin, the cavity is communicated with the discharge bin, and part of the first dust falling comb tooth is formed by inwardly recessing a side wall of the inner shell.

8. The phosphogypsum calcining device of claim 7, wherein, The calcining device comprises two impurity collection bins oppositely arranged in the length direction, and the plurality of dust falling comb teeth further comprises a second dust falling comb tooth correspondingly arranged between the two impurity collection bins, a plurality of second communication holes are arranged on the side wall of the inner shell, and each calcining channel on the second dust falling comb tooth is communicated with the discharge bin through the cavity via one second communication hole.

9. The phosphogypsum calcining device of claim 7, wherein, The inner shell, the impurity collection bin, the discharge bin and the dust falling comb tooth are integrally formed.

10. The phosphogypsum calcining device according to any one of claims 1-9, characterized in that, A plurality of distribution partition plates are arranged in the distribution bin, the plurality of distribution partition plates are arranged at intervals in the length direction, two side walls of each distribution partition plate in the width direction are connected with the inner wall of the distribution bin, and the plurality of distribution partition plates are used for separating the inner part of the distribution bin into a plurality of independent distribution cavities.

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