CN220579347U

CN220579347U - Pellet roasting system for co-processing mixed phosphorite

Info

Publication number: CN220579347U
Application number: CN202322211941.7U
Authority: CN
Inventors: 王春林; 李康; 代友训
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2023-08-17
Filing date: 2023-08-17
Publication date: 2024-03-12
Anticipated expiration: 2033-08-17

Abstract

The utility model discloses a pellet roasting system for co-processing mixed phosphorite, which comprises a mixed phosphorite pretreatment unit, a batching unit, a pelletizing unit, a distributing unit and a roasting cooling unit which are sequentially connected in series. The utility model solves the problem of resource waste caused by the fact that the powdered rock phosphate cannot be reused in the existing powdered rock phosphate processing, solves the problem of land resource waste caused by narrow source and massive stockpiling of the powdered rock phosphate in the existing powdered rock phosphate processing, realizes the recycling of the powdered rock phosphate, and also greatly saves land resources. Meanwhile, the prepared lump ore product has good quality, high strength, convenient subsequent transportation and strong portability; the system has the characteristics of simple structural layout, orderly and reasonable system component organization and small demand of arrangement sites, greatly saves land resources, can meet various terrain requirements, and has wide application range.

Description

Pellet roasting system for co-processing mixed phosphorite

Technical Field

The utility model relates to a resource utilization technology of various low-grade phosphate rock powders, in particular to a pellet roasting system for co-processing mixed phosphate rock, and belongs to the technical field of low-grade phosphate rock powder recycling.

Background

The phosphorite reserves in China are larger, but the average grade of phosphorite is lower. According to the related statistical data, the average grade of the phosphorus ore which can be collected in China at present is 23 percent and is lower than the average level of 30 percent worldwide. Wherein P is ₂ O ₅ The reserve ratio of the lower-grade phosphorite with the content lower than 20 percent exceeds 60 percent, and the reserve ratio of the high-grade phosphorite with the content higher than 30 percent is less than 10 percent.

At present, the technology for preparing yellow phosphorus by using phosphorite mainly comprises an electric furnace method: the natural phosphorite lump ore and the reducing agent are put into an electric furnace to be heated, the reducibility of the reducing agent at high temperature is utilized to enable the phosphorus simple substance to escape in the form of yellow phosphorus steam, and then the yellow phosphorus steam is cooled and collected to obtain the yellow phosphorus. However, the process has higher requirements on phosphorite raw materials and general requirements: the phosphorus ore fed into the furnace needs uniform granularity, has little water and carbonate content and P ₂ O ₅ The content of (2) is higher than 20%, and the heat strength is certain. In order to meet the production needs, yellow phosphorus production enterprises in China mainly use blocky phosphate ores as raw materials.

The phosphorite resources in China are mainly medium-low grade phosphorite, and the rich mineral resources are few. With the increasing consumption of high-quality phosphorite, the high-quality phosphorite used for yellow phosphorus production is less and less, the supply of natural phosphate lump ore resources is increasingly scarce, and the market price is also increasing. The problem of ore sources in yellow phosphorus production is solved, and the method becomes a key for guaranteeing the normal production of yellow phosphorus enterprises.

Meanwhile, enterprises inevitably generate a large amount of phosphate rock powder in the production process of obtaining natural phosphate rock lump ore, and the high-quality phosphate rock powder lacks perfect recycling equipment and cannot be directly used for preparing phosphorus by an electric furnace, so that the high-quality phosphate rock resource is idle, and the resource waste is caused; on the other hand, the phosphate rock powder which cannot be directly used for yellow phosphorus production is piled up in a large amount in a storage yard, so that a large amount of space is occupied, and land resource waste is caused.

Disclosure of Invention

Aiming at the problems of low utilization rate of low-grade phosphate rock powder, phosphorus resource waste caused by lack of perfect recycling equipment, land resource waste caused by a large amount of stockpiling and the like in the prior art, the utility model provides a pellet roasting system for the co-processing of mixed phosphate rock, which can coordinate and blend various low-grade phosphate rock powder with different properties, is used for preparing finished phosphate rock pellets required by yellow phosphorus production after raw material pretreatment, can effectively utilize powder ore resources, can expand raw material sources, can alleviate the problem of lack of raw materials of yellow phosphorus enterprises, can effectively reduce raw material cost, greatly saves land resources, accords with national industrial policies and resource development strategy, and has important significance for yellow phosphorus production enterprises in China.

In order to achieve the technical purpose, the technical scheme adopted by the utility model is as follows:

a pellet roasting system for co-processing mixed phosphorite comprises a mixed phosphorite pretreatment unit, a batching unit, a pelletizing unit, a distributing unit and a roasting cooling unit. According to the trend of the materials, the mixed phosphorite pretreatment unit, the batching unit, the pelletizing unit, the distributing unit and the roasting cooling unit are sequentially connected in series. Wherein, the mixed phosphorite pretreatment unit comprises a coarse phosphorite powder buffer bin I, one or more coarse phosphorite powder buffer bins II and a bulk material buffer bin which are arranged in parallel, and one or more coarse phosphorite powder buffer bins II and one or more bulk material buffer bins are optionally arranged. The discharging ends of the coarse phosphate rock buffering bin I, the coarse phosphate rock buffering bin II and the bulk material buffering bin are connected with the feeding end of the vertical mill through a first large-inclination-angle belt conveyor. One side of the vertical mill is provided with a smoke gas furnace, and an exhaust port of the smoke gas furnace is connected with an air inlet of the vertical mill through a smoke gas pipe. The discharge hole of the vertical mill is connected with the feed inlet of the pulse belt dust collector through a discharge air pipe. The bottom discharge end of the pulse belt type dust collector is connected with the feeding end of the batching unit. Preferably, the first large-inclination-angle belt conveyor is further provided with an iron remover.

In the utility model, a combination of vertical ore grinding with hot air separation and a pulse belt type dust remover is adopted. The front loading machine is arranged in front of the vertical mill and is used for receiving powder ore and bulk cargo, and a direct-pulling type quantitative feeder is arranged below the front loading machine and is used for controlling and adjusting feeding quantity. The ground material enters a powder ore bin after air classification, bag type dust collection and spiral conveying. And sending the tail gas after dust collection into a desulfurization and denitration device for further treatment, and discharging the tail gas into the atmosphere after reaching the discharge standard. To protect the mill, a permanent magnet iron remover is arranged on the first large-inclination-angle belt conveyor to remove iron pieces possibly existing in the raw materials.

In the utility model, the bottom ends of the coarse phosphate rock buffer bin I, the coarse phosphate rock buffer bin II and the bulk material buffer bin are respectively provided with a vibration anti-blocking device close to an outlet, a feeding gate is also arranged at the outlet under each bin, a quantitative feeder (direct-pulling type) is arranged under the feeding gate, and different raw materials are discharged through a computer control material gate and the quantitative feeder.

Preferably, an explosion-proof air pipe is led out from the discharging air pipe, and an explosion-proof valve is arranged on the explosion-proof air pipe.

Preferably, the exhaust port of the pulse belt type dust collector is connected with the desulfurization and denitrification device through the pulverized coal ventilator and the external exhaust pipe.

In the utility model, a manual gate valve is arranged at the outlet of an ash accumulation hopper below a pulse bag type dust collector, a star-shaped discharger is arranged below the manual gate valve, and a screw conveyor (capable of rotating positively and negatively) is arranged below the star-shaped discharger.

Preferably, the batching unit comprises a mixed powder ore bin, a fine phosphorite powder buffer bin and a dust bin. The feeding end of the mixed powder ore bin is connected with the bottom discharging end of the pulse belt type dust remover through a spiral feeder. The discharging ends of the mixed powder ore bin, the fine phosphate ore buffering bin and the dust bin are connected with the feeding end of the pelletizing unit through a batching belt conveyor. Preferably, the feeding end of the dust bin is also provided with a dust receiving device.

In the utility model, a plurality of mixed powder ore bins, fine phosphorite powder buffering bins and dust bins can be arranged, and two mixed powder ore bins, one fine phosphorite powder buffering bin and one dust bin are generally designed. The two ends of the screw conveyor are respectively connected with the feed inlet of one mixed powder ore bin, and the powder ore in the pulse bag dust collector is respectively conveyed into the two mixed powder ore bins through forward and reverse rotation of the screw conveyor. Further, vibration anti-blocking devices and automatic or manual gate valves are arranged at the discharge ports of the mixed powder ore bin, the fine phosphate ore buffering bin and the dust bin, the lower part of the fine phosphate ore buffering bin is connected with the batching belt conveyor through a direct-pulling type quantitative feeder, and the lower parts of the mixed powder ore bin and the dust bin are connected with the batching belt conveyor through a full-sealing type quantitative feeder. In addition, an impeller feeder can be arranged between the manual gate valve of the dust bin and the fully-sealed quantitative feeder.

Preferably, the pelletizing unit comprises an intensive mixer, a mixing bin and a pelletizer. The feeding end of the intensive mixer is connected with the discharging end of the batching belt conveyor, and the discharging end of the intensive mixer is simultaneously connected with the feeding ends of a plurality of mixing bins through the mixing belt conveyor and a plurality of plow-shaped discharger. A pelletizer is arranged below the discharge port of each mixing bin. The discharging ends of all the pelletizers are connected with the feeding ends of the distributing units through green-ball belt conveyors. Preferably, a metering scale is further arranged at the discharging end of the green ball belt conveyor. The pelletizer is a disc pelletizer.

In the utility model, a plurality of plow-type unloading devices are arranged on a batching belt conveyor, a plurality of mixing bins are arranged under the batching belt conveyor in parallel, a head blanking port of the batching belt conveyor is connected with a feeding port of one of the mixing bins, then a vibrating hopper is arranged under each plow-type unloading device for the rest mixing bins, and a quantitative belt feeder is arranged under each mixing bin and connected with a feeding end of a pelletizer.

In the utility model, each pelletizing series consists of 1 mixing bin, 1 quantitative belt feeder and 1 disc pelletizer. Mix from the intensive mixer and green pellet return is transported to After pelletizing, the pellets are distributed to each mixing trough through a plow discharger, and the under-trough feeding equipment adopts a quantitative feeder (variable frequency speed regulation), and the feeding amount can be automatically regulated according to a set value. The mixture is rolled and grown into balls under the proper moisture condition in the pelletizer. The balls automatically overflow from the disc surface due to the centrifugal force and gravity, and are sent to a sieving and distributing system (for example, the effective volume of a single mixing tank is about 25m ³ The storage time is 30 to 45 minutes, and adoptsThe disc pelletizer has variable frequency speed, adjustable disc inclination angle (manual adjustment), and the residence time of the material in the disc can be adjusted by changing the disc inclination angle and the rotating speed, and the qualified green ball yield of a single production unit is 20-25 t/h.

Preferably, the distributing unit comprises a roller type sieving machine, a roller type sieving distributing machine and a bedding bin. The feeding end of the roller type screening machine is connected with the discharging end of the green ball belt conveyor. The undersize material outlet of the roller type sieving machine is connected with the feeding end of the roller type sieving distributor through a broadband conveyor. The material outlet on the screen of the roller type screening distributor is connected with the feeding end of the roasting cooling unit through the upper chute. The bottom spreading bin is arranged in parallel with the roller type screening distributor, and a bottom discharge hole of the bottom spreading bin is connected with a feed end of the roasting cooling unit through a bottom spreading distributing device, and the connection position of the bottom spreading bin and the feeding end of the roasting cooling unit is positioned at the upstream of the connection position of a screen chute of the roller type screening distributor and the feed end of the roasting cooling unit. Preferably, the oversize material outlet of the roller screening machine and the undersize material outlet of the roller screening distributor are connected with the feeding end of the mixture belt conveyor through the return belt conveyor.

Preferably, the mesh size of the roller screen is 20-35mm, preferably 25-30mm. The mesh size of the roller screening cloth machine is 10-18mm, preferably 12-16mm.

In the present utility model, the green pellets are typically sized to 30mm and 15mm. After passing through the pendulum belt conveyor, the green pellets are uniformly arranged on a roller type sieving machine, and the unqualified pellets with the diameters larger than 30mm are sieved and removed from the sieving machine; the green pellets with the screen rain of 30mm are further homogenized by a wide belt conveyor and conveyed to a small ball roller type screening distributor (roller type screening distributor), and qualified green pellets with the screen of 15 mm-30 mm are uniformly distributed on a roasting device; reject balls smaller than 15mm were screened out of under screen. The crushing roller is arranged at the tail end of the roller type sieving machine, so that the big ball can be crushed, and the big ball is prevented from directly returning to the pelletizing, so that the pelletizing efficiency and the green ball quality are prevented from being influenced. And collecting and transferring the unqualified green pellets by a material returning belt conveyor, and finally returning to a pelletizing system for re-pelletizing. An automatic material thickness measuring device is arranged above the roasting device, and the material layer thickness is controlled by automatically adjusting the running speed of the roasting device. In order to protect the roasting device, a bedding system is arranged, natural phosphate ore blocks are used as bedding materials, and when the natural phosphate ore blocks are insufficient, part of finished products can be selected as the bedding materials.

Preferably, according to the trend of the materials, the roasting cooling unit comprises a first drying section, a second drying section, a preheating section, a roasting soaking section, a first cooling section and a second cooling section which are sequentially connected in series. The upper parts of the drying first section, the drying second section, the preheating section, the roasting soaking section, the cooling first section and the cooling second section are covered with a fan housing, and the bottoms of the fan housing and the cooling second section are respectively provided with an independent air box. Preferably, a bulk hopper is also arranged below each bellows. A double-layer ash discharging valve is arranged in each bellows. The feeding end of the drying section is connected with the discharge end of a material spreading device of the upper screen chute of the roller type screening material spreader.

Preferably, the system further comprises a hot air utilization unit, wherein the hot air utilization unit comprises a cooling fan, a regenerative fan, a drying exhaust fan, a main exhaust fan, a multi-tube dust remover, a first bag dust remover, a second bag dust remover, a pipeline heating furnace and a plurality of blast pipes. The cooling fan is connected with the bottom air inlet of the cooling second section through the first air supply pipe and the bottom air inlet of the cooling first section through the second air supply pipe respectively. The top air outlet of the second cooling section is connected with the top air inlet of the first drying section through a third air supply pipe, the bottom air outlet of the first drying section is connected with the air inlet end of the first bag-type dust remover through a fourth air supply pipe, the air outlet end of the first bag-type dust remover is connected with a chimney through a fifth air supply pipe, and a drying exhaust fan is arranged on the fifth air supply pipe. The top air outlet of the cooling section is connected with the top air inlet of the roasting and homogenizing section through a sixth air supply pipe, and is connected with the top air inlet of the preheating section through a seventh air supply pipe, and a pipeline heating furnace is arranged on the sixth air supply pipe. The bottom air outlet of the roasting soaking section is connected with the air inlet of the multi-pipe dust remover through an eighth air supply pipe, the air outlet of the multi-pipe dust remover is connected with the top air inlet of the drying second section through a ninth air supply pipe, and a regenerative fan is arranged on the ninth air supply pipe. The bottom air outlet of the preheating section is connected with the air inlet end of the first bag-type dust collector through a tenth air supply pipe. The bottom air outlet of the second drying section is connected with the air inlet end of the second bag-type dust collector through an eleventh air supply pipe, the air outlet end of the second bag-type dust collector is connected with the desulfurization and denitrification device through a twelfth air supply pipe, and a main exhaust fan is arranged on the twelfth air supply pipe.

In the utility model, the green pellets are dried, thermally consolidated and cooled in sequence on a roasting and cooling unit. The roasting cooling unit is provided with a fixed screen, the roasted product is screened, the materials with the size less than 5mm are removed through screening, and the materials are returned to a raw ore storage yard after being collected and transported; the materials with the thickness of more than or equal to 5mm are used as finished products, most of the materials are transported to an electric furnace system for producing yellow phosphorus, and in addition, a small part of the materials are separated out and recycled to a bottom spreading bin at the material distributing end of a roasting device (for example, a grate-selecting type thermal consolidation machine of the roasting device is 4.7X163 m in specification, the thickness of a material layer on a grate bed is 240mm (the thickness of the bottom spreading material is 80 mm), and the total residence time is about 40-15 min). In addition, a pipeline heating furnace is arranged to supplement a heat source for the system. The roasting device adopts a hot air utilization unit for heat cascade utilization, utilizes cold air to carry heat from a cooling section to form high-temperature flue gas with different temperatures, recovers waste heat of the system, and is respectively used as a part of heat for front-stage drying and thermal consolidation, so that the consumption of fuel is reduced. The roasting device carries scattered balls, wind box dust collection and machine tail screen unders together as bulk materials, and the bulk materials are collected intensively and transported back to a raw material storage yard. In the cascade utilization process of the high-temperature flue gas, a high-temperature multi-pipe dust remover is arranged for removing dust in the flue gas in order to protect the circulating fan. After cascade utilization, the flue gas finally can be shaped A portion of the low temperature flue gas, wherein the flue gas of the drying section and the preheating section does not contain NO _X 、SO ₂ And (3) waiting for pollutants, wherein after dust is removed from the part of flue gas through a bag-type dust remover, the part of flue gas is directly discharged into the atmosphere through a drying exhaust fan; the second-stage flue gas contains NO in addition to dust _X 、SO ₂ And the pollutants are sent to a desulfurization and denitration device for further purification and emission after reaching standards through dust removal of a bag-type dust remover and a main exhaust fan. The dust concentration at the outlet of the bag-type dust collector is less than or equal to 10mg/Nm ³ . The dust collected by each dust remover is returned to the dust proportioning bin of the proportioning area through the pneumatic conveying system and is recycled as raw materials.

Preferably, the system further comprises a finished product screening unit comprising a fixed screen and a three-way feeder. The feeding end of the fixed screen is connected with the discharging end of the cooling second section. The feeding end of the three-way feeder is connected with a screen discharge port of the fixed screen through a finished ore belt conveyor. The first discharge port of the three-way feeder is connected with a finished product ore bin through a finished product large-inclination-angle belt conveyor. The second discharge port of the three-way feeder is connected with the feed end of the bottom paving bin through a bottom paving large-inclination-angle belt conveyor. Preferably, the system further comprises a bulk material collecting unit, wherein the bulk material collecting unit comprises a bulk material belt conveyor, a bulk material large-inclination belt conveyor and a bulk material bin. The feeding end of the bulk material belt conveyor is connected with the undersize discharging chute of the fixed screen and the discharging ports of all the bulk hoppers. The discharging end of the bulk material belt conveyor is connected with the bulk material bin through the bulk material large-inclination-angle belt conveyor.

In the utility model, a bin wall vibrator and an electrohydraulic fan valve are arranged at the bottom outlet of a bulk bin, collected bulk materials are lowered into a bulk material conveying mechanism (such as a bulk material transport vehicle) through the electrohydraulic fan valve, and the bulk materials are returned into a bulk material buffer bin through the bulk material conveying mechanism.

Preferably, the system further comprises a dust collecting unit, wherein the dust collecting unit comprises a first dust pneumatic conveying pipeline, a second dust pneumatic conveying pipeline and a third dust pneumatic conveying pipeline. The feeding end of the first dust pneumatic conveying pipeline is connected with the dust outlet of the multi-pipe dust remover, and the other end of the first dust pneumatic conveying pipeline is connected with the feeding port of the dust bin. The feeding end of the second dust pneumatic conveying pipeline is connected with the dust outlet of the first bag-type dust remover, and the other end of the second dust pneumatic conveying pipeline is connected with the feeding port of the dust bin. The feeding end of the third dust pneumatic conveying pipeline is connected with the dust outlet of the second bag-type dust remover, and the other end of the third dust pneumatic conveying pipeline is connected with the feeding port of the dust bin. The feeding ends of the first dust pneumatic conveying pipeline, the second dust pneumatic conveying pipeline and the third dust pneumatic conveying pipeline are respectively and independently provided with a bin pump.

According to the utility model, the bottom-paved bin is connected with the finished ore bin, namely, the finished ore block ore with the grade higher than that of the low-grade phosphate rock powder is used as the bottom-paved material, so that the average grade of the finished material block can be improved by mixing, and meanwhile, the finished phosphate ore block ore is used as the bottom-paved material, so that the air permeability is improved, the roasting device is protected, and the productivity is improved by selecting a proper thickness of the bottom-paved material.

In the utility model, a powerful mixer is adopted for mixing and granulating, so that the granulating effect can be improved, the particle size distribution of the granules is better, and the strength of the pellets is better.

In the utility model, the low-temperature bulk material and the ground phosphate rock are mixed and then subjected to fine grinding treatment, so that the energy consumption of fine grinding can be further reduced, the fine grinding efficiency can be further improved, and the fine grinding effect can be further improved under the action of the low-temperature cooked pellets with high strength.

In the utility model, hot air generated during cooling is recycled to supply heat for the processes of drying, preheating and the like, and the waste heat of the system is fully recovered through cascade utilization, and the utilized waste gas is discharged after dust removal, desulfurization and denitrification, so that the heating energy consumption is greatly reduced, and the environmental protection benefit is increased. In addition, various bulk materials and dust generated in the system are recycled, so that valuable resources are recycled, and meanwhile, direct external pollution discharge and environment pollution are avoided.

In the present utility model, each belt conveyor (belt conveyor for transporting materials) is composed of one or more conveyors in series, and weighing mechanisms (such as a scale) are optionally provided on each conveyor.

Compared with the prior art, the utility model has the following beneficial technical effects:

1: the utility model well solves the problem of resource waste caused by the fact that the powdered rock phosphate cannot be reused in the existing powdered rock phosphate processing, simultaneously realizes the cooperative treatment of different types of low-grade powdered rock phosphate, solves the problem of land resource waste caused by narrow source of powdered rock phosphate and massive stockpiling in the existing powdered rock phosphate processing, realizes the recycling of powdered rock phosphate, and also greatly saves land resources.

2: the block mineral product prepared by the method has the advantages of good quality, high strength, convenience for subsequent transportation and strong portability. The water content of the lump ore products is low, the carbonate content is low, the power consumption of the subsequent lump ore phosphorus production is effectively reduced, and the purity of phosphorus is improved.

3: the utility model has simple structural layout, orderly and reasonable system component organization, small demand of arrangement field, great land resource saving, capability of meeting various terrain requirements and wide application range.

Drawings

FIG. 1 is a schematic diagram of the connection relationship of the units of the system according to the present utility model.

Fig. 2 is a schematic structural diagram of a mixed phosphorite pretreatment unit and a batching unit of the system of the utility model.

Fig. 3 is a schematic view of the structure of the pelletizing unit of the system according to the present utility model.

Fig. 4 is a schematic structural diagram of a distributing unit, a roasting cooling unit, a finished product screening unit and the like of the system of the utility model.

Reference numerals: 1: a mixed phosphorite pretreatment unit; 101: a coarse phosphate rock powder buffer bin I;102: a coarse phosphate rock powder buffer bin II;103: bulk material buffer bin; 104: a first large-inclination-angle belt conveyor; 105: a vertical mill; 106: a flue gas furnace; 107: a flue pipe; 108: a discharging air pipe; 109: a pulse belt dust collector; 110: an explosion-proof air pipe; 111: an iron remover; 112: an explosion-proof valve; 113: a pulverized coal ventilator; 114: an outer exhaust duct; 15: a desulfurization and denitrification device;

2: a batching unit; 201: mixing a powder ore bin; 202: fine phosphorite powder buffer bin; 203: a dust bin; 204: a spiral feeder; 205: a batching belt conveyor; 206: a dust receiving device;

3: a pelletizing unit; 301: a powerful mixer; 302: a mixing bin; 303: a pelletizer; 304: a mix belt conveyor; 305: plow discharger; 306: green ball belt conveyor; 307: a metering scale;

4: a cloth unit; 401: a roller screen; 402: a roller screening cloth machine; 403: paving a bottom material bin; 404: a wide-band conveyor; 405: a bedding material distributing device; 406: a return belt conveyor;

5: a roasting cooling unit; 501: drying for one section; 502: drying the second section; 503: a preheating section; 504: roasting and homogenizing heat section; 505: cooling the first section; 506: cooling the second section; 507: a fan housing; 508: a wind box; 509: a bulk hopper; 510: a double-layer ash valve;

6: a hot air utilization unit; 601: a cooling fan; 602: a regenerative fan; 603: drying exhaust fan; 604: a main exhaust fan; 605: a multi-tube dust remover; 606: a first bag-type dust collector; 607: a second bag-type dust collector; 608: a pipe heating furnace;

7: a finished product screening unit; 701: a fixed screen; 702: a three-way feeder; 703: a finished ore belt conveyor; 704: a finished product large-inclination-angle belt conveyor; 705: a belt conveyor with a large dip angle for paving the bottom materials; 706: a finished ore bin;

8: a bulk material collecting unit; 801: bulk belt conveyor; 802: bulk material large dip angle belt conveyor; 803: bulk bin;

9: a dust collection unit; 901: a first dust pneumatic conveying pipeline; 902: a second dust pneumatic conveying pipeline; 903: a third dust pneumatic conveying pipeline; 904: and (3) a bin pump:

l1: a first air supply pipe; l2: a second air supply pipe; l3: a third air supply pipe; l4: a fourth air supply pipe; l5: a fifth air supply pipe; l6: a sixth air supply pipe; l7: a seventh air supply duct; l8: an eighth air supply pipe; l9: a ninth air supply duct; l10: a tenth air supply pipe; l11: an eleventh air supply pipe; l12: twelfth blast pipe.

Detailed Description

The following examples illustrate the technical aspects of the utility model, and the scope of the utility model claimed includes but is not limited to the following examples.

The system comprises a mixed phosphorite pretreatment unit 1, a batching unit 2, a pelletizing unit 3, a distributing unit 4 and a roasting cooling unit 5. According to the trend of the materials, the mixed phosphorite pretreatment unit 1, the batching unit 2, the pelletizing unit 3, the distributing unit 4 and the roasting cooling unit 5 are sequentially connected in series. Wherein, the mixed phosphorite pretreatment unit 1 comprises a coarse phosphorite powder buffer bin I101 which is arranged in parallel, one or a plurality of coarse phosphorite powder buffer bins II102 which are optionally arranged or not arranged, and a bulk material buffer bin 103. The discharge ends of the coarse phosphate rock buffer bin I101, the coarse phosphate rock buffer bin II102 and the bulk material buffer bin 103 are connected with the feed end of the vertical mill 105 through a first large-inclination-angle belt conveyor 104. A flue gas furnace 106 is arranged at one side of the vertical mill 105, and an exhaust port of the flue gas furnace 106 is connected with an air inlet of the vertical mill 105 through a flue gas pipe 107. The discharge port of the vertical mill 105 is connected with the feed port of the pulse belt dust collector 109 through a discharge air pipe 108. The bottom discharge end of the pulse belt dust collector 109 is connected with the feed end of the dosing unit 2. Preferably, the first large inclination angle belt conveyor 104 is further provided with an iron remover 111.

Preferably, an explosion-proof air pipe 110 is led out from the discharging air pipe 108, and an explosion-proof valve 112 is arranged on the explosion-proof air pipe 110.

Preferably, the exhaust port of the pulse belt dust collector 109 is connected to a desulfurization and denitrification device 115 through a pulverized coal ventilator 113 and an external exhaust pipe 114.

Preferably, the batching unit 2 comprises a mixed powder ore bin 201, a fine phosphate rock powder buffering bin 202 and a dust bin 203. The feeding end of the mixed powder ore bin 201 is connected with the bottom discharging end of the pulse belt dust collector 109 through a screw feeder 204. The discharging ends of the mixed powder ore bin 201, the fine phosphate rock powder buffer bin 202 and the dust bin 203 are all connected with the feeding end of the pelletizing unit 3 through a batching belt conveyor 205. Preferably, the feeding end of the dust bin 203 is further provided with a dust receiving device 206.

Preferably, the pelletizing unit 3 comprises an intensive mixer 301, a mixing bin 302 and a pelletizer 303. The feed end of the intensive mixer 301 is connected to the discharge end of the batching belt conveyor 205, and the discharge end of the intensive mixer 301 is simultaneously connected to the feed ends of a plurality of mixing bins 302 via a mix belt conveyor 304 and a plurality of plow-shaped trippers 305. A pelletizer 303 is disposed below the discharge opening of each mixing silo 302. The discharge ends of all the pelletizers 303 are connected to the feed end of the distribution unit 4 via green belt conveyors 306. Preferably, a metering scale 307 is also provided at the discharge end of the green belt conveyor 306. The pelletizer 303 is a disc pelletizer.

Preferably, the distributing unit 4 includes a roller screening machine 401, a roller screening distributing machine 402, and a priming bin 403. The feed end of the roller screen 401 is connected to the discharge end of the green belt conveyor 306. The undersize material outlet of the roller screen 401 is connected to the feed end of the roller screen spreader 402 by a wide belt conveyor 404. The oversize material outlet of the roller screening distributor 402 is connected with the feed end of the roasting cooling unit 5 through an upper screen chute. The bottom spreading bin 403 is arranged in parallel with the roller screening distributor 402, and a bottom discharge hole of the bottom spreading bin is connected with a feed end of the roasting cooling unit 5 through a bottom spreading distributing device 405, and the connection position of the bottom spreading bin and the bottom spreading distributing device is positioned at the upstream of the connection position of a screen chute of the roller screening distributor 402 and the feed end of the roasting cooling unit 5. Preferably, the oversize material outlet of roller screen 401 and the undersize material outlet of roller screen spreader 402 are each connected to the feed end of mix belt conveyor 304 by return belt conveyor 406.

Preferably, the mesh size of the roller screen 401 is 20 to 35mm, preferably 25 to 30mm. The mesh size of the roll screen cloth 402 is 10-18mm, preferably 12-16mm.

Preferably, according to the trend of the material, the roasting cooling unit 5 includes a first drying section 501, a second drying section 502, a preheating section 503, a roasting soaking section 504, a first cooling section 505 and a second cooling section 506, which are sequentially connected in series. The fan housing 507 and the independent air box 508 are respectively arranged at the bottom of each fan housing above the first drying section 501, the second drying section 502, the preheating section 503, the roasting soaking section 504, the first cooling section 505 and the second cooling section 506. Preferably, a bulk hopper 509 is also provided below each bellows 508. A double layer ash valve 510 is also provided inside each bellows 508. The feed end of the drying section 501 is connected to the discharge end of the on-screen chute of the roller screen spreader 402 and the bedding spreader 405.

Preferably, the system further comprises a hot air utilization unit 6, wherein the hot air utilization unit 6 comprises a cooling fan 601, a backheating fan 602, a drying exhaust fan 603, a main exhaust fan 604, a multi-tube dust remover 605, a first cloth bag dust remover 606, a second cloth bag dust remover 607, a pipeline heating furnace 608 and a plurality of blast pipes. The cooling fan 601 is connected to the bottom air inlet of the cooling second section 506 through the first air supply pipe L1 and the bottom air inlet of the cooling first section 505 through the second air supply pipe L2. The top air outlet of cooling second section 506 is connected with the top air intake of dry first section 501 through third blast pipe L3, and the bottom air outlet of dry first section 501 is connected with the air inlet end of first sack cleaner 606 through fourth blast pipe L4, and the air outlet end of first sack cleaner 606 is connected with the chimney through fifth blast pipe L5, is equipped with dry exhaust fan 603 on the fifth blast pipe L5. The top air outlet of the cooling section 505 is connected with the top air inlet of the roasting and homogenizing section 504 through a sixth air supply pipe L6 and is connected with the top air inlet of the preheating section 503 through a seventh air supply pipe L7, and a pipeline heating furnace 608 is arranged on the sixth air supply pipe L6. The bottom air outlet of roasting soaking section 504 is connected with the air intake of multitube dust remover 605 through eighth blast pipe L8, and the air outlet of multitube dust remover 603 is connected with the top air intake of dry two section 502 through ninth blast pipe L9, is provided with back heat fan 602 on the ninth blast pipe L9. The bottom air outlet of the preheating section 503 is connected with the air inlet end of the first bag-type dust collector 606 through a tenth air supply pipe L10. The bottom air outlet of the second drying section 502 is connected with the air inlet end of the second bag-type dust collector 607 through an eleventh air supply pipe L11, the air outlet end of the second bag-type dust collector 607 is connected with the desulfurization and denitrification device 115 through a twelfth air supply pipe L12, and a main exhaust fan 604 is arranged on the twelfth air supply pipe L12.

Preferably, the system further comprises a finished product screening unit 7, said finished product screening unit 7 comprising a stationary screen 701 and a three-way feeder 702. The feed end of the fixed screen 701 is connected to the discharge end of the cooling section 506. The feed end of the three-way feeder 702 is connected with the upper screen discharge port of the fixed screen 701 through a finished ore belt conveyor 703. The first outlet of the three-way feeder 702 is connected to a finished ore bin 706 by a finished high tilt belt conveyor 704. The second discharge port of the three-way feeder 702 is connected with the feed end of the bottom paving bin 403 through a bottom paving material large-inclination-angle belt conveyor 705.

Preferably, the system further comprises a bulk material collecting unit 8, wherein the bulk material collecting unit 8 comprises a bulk material belt conveyor 801, a bulk material large inclination belt conveyor 802 and a bulk material bin 803. The feed end of bulk belt conveyor 801 is connected to both the undersize discharge chute of fixed screen 701 and the discharge ports of all bulk hoppers 509. The discharge end of the bulk belt conveyor 801 is connected to a bulk bin 803 by a bulk high tilt belt conveyor 802.

Preferably, the system further comprises a dust collection unit 9, wherein the dust collection unit 9 comprises a first dust pneumatic conveying pipeline 901, a second dust pneumatic conveying pipeline 902 and a third dust pneumatic conveying pipeline 903. The feeding end of the first dust pneumatic conveying pipeline 901 is connected with the dust outlet of the multi-pipe dust remover 605, and the other end of the first dust pneumatic conveying pipeline is connected with the feeding port of the dust bin 203. The feeding end of the second dust pneumatic conveying pipeline 902 is connected with the dust outlet of the first bag-type dust remover 606, and the other end of the second dust pneumatic conveying pipeline is connected with the feeding opening of the dust bin 203. The feeding end of the third dust pneumatic conveying pipeline 903 is connected with the dust outlet of the second bag-type dust collector 607, and the other end of the third dust pneumatic conveying pipeline is connected with the feeding opening of the dust bin 203. The feeding ends of the first dust pneumatic conveying pipeline 901, the second dust pneumatic conveying pipeline 902 and the third dust pneumatic conveying pipeline 903 are respectively and independently provided with a bin pump 904.

Example 1

As shown in fig. 1 to 4, a pellet roasting system for co-treatment of mixed phosphate rock comprises a mixed phosphate rock pretreatment unit 1, a batching unit 2, a pelletizing unit 3, a distributing unit 4 and a roasting cooling unit 5. According to the trend of the materials, the mixed phosphorite pretreatment unit 1, the batching unit 2, the pelletizing unit 3, the distributing unit 4 and the roasting cooling unit 5 are sequentially connected in series. Wherein, the mixed phosphorite pretreatment unit 1 comprises a coarse phosphorite powder buffer bin I101, a coarse phosphorite powder buffer bin II102 and a bulk material buffer bin 103 which are arranged in parallel. The discharge ends of the coarse phosphate rock buffer bin I101, the coarse phosphate rock buffer bin II102 and the bulk material buffer bin 103 are connected with the feed end of the vertical mill 105 through a first large-inclination-angle belt conveyor 104. A flue gas furnace 106 is arranged at one side of the vertical mill 105, and an exhaust port of the flue gas furnace 106 is connected with an air inlet of the vertical mill 105 through a flue gas pipe 107. The discharge port of the vertical mill 105 is connected with the feed port of the pulse belt dust collector 109 through a discharge air pipe 108. The bottom discharge end of the pulse belt dust collector 109 is connected with the feed end of the dosing unit 2. The first large-inclination-angle belt conveyor 104 is further provided with an iron remover 111.

Example 2

Example 1 is repeated except that an explosion-proof air duct 110 is also led out from the discharging air duct 108, and an explosion-proof valve 112 is disposed on the explosion-proof air duct 110.

Example 3

Example 2 was repeated except that the exhaust port of the pulse belt dust collector 109 was connected to a desulfurization and denitrification device 115 through a pulverized coal ventilator 113 and an external exhaust pipe 114.

Example 4

Example 3 is repeated except that the batching unit 2 includes a mixed powder ore bin 201, a fine phosphorus ore buffer bin 202, and a dust bin 203. The feeding end of the mixed powder ore bin 201 is connected with the bottom discharging end of the pulse belt dust collector 109 through a screw feeder 204. The discharging ends of the mixed powder ore bin 201, the fine phosphate rock powder buffer bin 202 and the dust bin 203 are all connected with the feeding end of the pelletizing unit 3 through a batching belt conveyor 205.

Example 5

Example 4 was repeated except that the feeding end of the dust bin 203 was further provided with a dust receiving device 206.

Example 6

Example 5 is repeated except that the pelletizing unit 3 comprises an intensive mixer 301, a mixing silo 302 and a pelletizer 303. The feed end of the intensive mixer 301 is connected to the discharge end of the batching belt conveyor 205, and the discharge end of the intensive mixer 301 is simultaneously connected to the feed ends of a plurality of mixing bins 302 via a mix belt conveyor 304 and a plurality of plow-shaped trippers 305. A pelletizer 303 is disposed below the discharge opening of each mixing silo 302. The discharge ends of all the pelletizers 303 are connected to the feed end of the distribution unit 4 via green belt conveyors 306.

Example 7

Example 6 was repeated except that a weighing scale 307 was further provided at the discharge end of the green belt conveyor 306. The pelletizer 303 is a disc pelletizer.

Example 8

Example 7 is repeated except that the distributing unit 4 comprises a roller screen 401, a roller screen distributor 402 and a priming silo 403. The feed end of the roller screen 401 is connected to the discharge end of the green belt conveyor 306. The undersize material outlet of the roller screen 401 is connected to the feed end of the roller screen spreader 402 by a wide belt conveyor 404. The oversize material outlet of the roller screening distributor 402 is connected with the feed end of the roasting cooling unit 5 through an upper screen chute. The bottom spreading bin 403 is arranged in parallel with the roller screening distributor 402, and a bottom discharge hole of the bottom spreading bin is connected with a feed end of the roasting cooling unit 5 through a bottom spreading distributing device 405, and the connection position of the bottom spreading bin and the bottom spreading distributing device is positioned at the upstream of the connection position of a screen chute of the roller screening distributor 402 and the feed end of the roasting cooling unit 5.

Example 9

Example 8 was repeated except that the oversize material outlet of roller screen 401 and the undersize material outlet of roller screen spreader 402 were both connected to the feed end of mix belt conveyor 304 by return belt conveyor 406.

Example 10

Example 9 was repeated except that the mesh size of the roller classifier 401 was 30mm. The mesh size of the roll screen cloth machine 402 was 15mm.

Example 11

Example 10 was repeated, and the roasting cooling unit 5 comprises a first drying section 501, a second drying section 502, a preheating section 503, a roasting soaking section 504, a first cooling section 505 and a second cooling section 506 which are sequentially connected in series according to the trend of the material. The fan housing 507 and the independent air box 508 are respectively arranged at the bottom of each fan housing above the first drying section 501, the second drying section 502, the preheating section 503, the roasting soaking section 504, the first cooling section 505 and the second cooling section 506. A bulk hopper 509 is also provided below each bellows 508. A double layer ash valve 510 is also provided inside each bellows 508. The feed end of the drying section 501 is connected to the discharge end of the on-screen chute of the roller screen spreader 402 and the bedding spreader 405.

Example 12

Embodiment 11 is repeated except that the system further comprises a hot air utilization unit 6, wherein the hot air utilization unit 6 comprises a cooling fan 601, a regenerative fan 602, a drying exhaust fan 603, a main exhaust fan 604, a multi-tube dust remover 605, a first cloth bag dust remover 606, a second cloth bag dust remover 607, a pipeline heating furnace 608 and a plurality of blast pipes. The cooling fan 601 is connected to the bottom air inlet of the cooling second section 506 through the first air supply pipe L1 and the bottom air inlet of the cooling first section 505 through the second air supply pipe L2. The top air outlet of cooling second section 506 is connected with the top air intake of dry first section 501 through third blast pipe L3, and the bottom air outlet of dry first section 501 is connected with the air inlet end of first sack cleaner 606 through fourth blast pipe L4, and the air outlet end of first sack cleaner 606 is connected with the chimney through fifth blast pipe L5, is equipped with dry exhaust fan 603 on the fifth blast pipe L5. The top air outlet of the cooling section 505 is connected with the top air inlet of the roasting and homogenizing section 504 through a sixth air supply pipe L6 and is connected with the top air inlet of the preheating section 503 through a seventh air supply pipe L7, and a pipeline heating furnace 608 is arranged on the sixth air supply pipe L6. The bottom air outlet of roasting soaking section 504 is connected with the air intake of multitube dust remover 605 through eighth blast pipe L8, and the air outlet of multitube dust remover 603 is connected with the top air intake of dry two section 502 through ninth blast pipe L9, is provided with back heat fan 602 on the ninth blast pipe L9. The bottom air outlet of the preheating section 503 is connected with the air inlet end of the first bag-type dust collector 606 through a tenth air supply pipe L10. The bottom air outlet of the second drying section 502 is connected with the air inlet end of the second bag-type dust collector 607 through an eleventh air supply pipe L11, the air outlet end of the second bag-type dust collector 607 is connected with the desulfurization and denitrification device 115 through a twelfth air supply pipe L12, and a main exhaust fan 604 is arranged on the twelfth air supply pipe L12.

Example 13

Example 12 is repeated except that the system further comprises a finished product screening unit 7, said finished product screening unit 7 comprising a stationary screen 701 and a three way feeder 702. The feed end of the fixed screen 701 is connected to the discharge end of the cooling section 506. The feed end of the three-way feeder 702 is connected with the upper screen discharge port of the fixed screen 701 through a finished ore belt conveyor 703. The first outlet of the three-way feeder 702 is connected to a finished ore bin 706 by a finished high tilt belt conveyor 704. The second discharge port of the three-way feeder 702 is connected with the feed end of the bottom paving bin 403 through a bottom paving material large-inclination-angle belt conveyor 705.

Example 14

Example 13 is repeated except that the system further comprises a bulk material collecting unit 8, said bulk material collecting unit 8 comprising a bulk material belt conveyor 801, a bulk material high inclination belt conveyor 802 and a bulk material bin 803. The feed end of bulk belt conveyor 801 is connected to both the undersize discharge chute of fixed screen 701 and the discharge ports of all bulk hoppers 509. The discharge end of the bulk belt conveyor 801 is connected to a bulk bin 803 by a bulk high tilt belt conveyor 802.

Example 15

Example 14 is repeated except that the system further comprises a dust collection unit 9, said dust collection unit 9 comprising a first dust pneumatic conveying duct 901, a second dust pneumatic conveying duct 902 and a third dust pneumatic conveying duct 903. The feeding end of the first dust pneumatic conveying pipeline 901 is connected with the dust outlet of the multi-pipe dust remover 605, and the other end of the first dust pneumatic conveying pipeline is connected with the feeding port of the dust bin 203. The feeding end of the second dust pneumatic conveying pipeline 902 is connected with the dust outlet of the first bag-type dust remover 606, and the other end of the second dust pneumatic conveying pipeline is connected with the feeding opening of the dust bin 203. The feeding end of the third dust pneumatic conveying pipeline 903 is connected with the dust outlet of the second bag-type dust collector 607, and the other end of the third dust pneumatic conveying pipeline is connected with the feeding opening of the dust bin 203. The feeding ends of the first dust pneumatic conveying pipeline 901, the second dust pneumatic conveying pipeline 902 and the third dust pneumatic conveying pipeline 903 are respectively and independently provided with a bin pump 904.

Claims

1. The utility model provides a pellet calcination system that mixed phosphorite was disposed of in coordination which characterized in that: the system comprises a mixed phosphorite pretreatment unit (1), a batching unit (2), a pelletizing unit (3), a distributing unit (4) and a roasting cooling unit (5); according to the trend of the materials, the mixed phosphorite pretreatment unit (1), the batching unit (2), the pelletizing unit (3), the distributing unit (4) and the roasting cooling unit (5) are sequentially connected in series; wherein the mixed phosphorite pretreatment unit (1) comprises a coarse phosphorite powder buffer bin I (101) which is arranged in parallel, one or more coarse phosphorite powder buffer bins II (102) and a bulk material buffer bin (103) which are optionally arranged or not arranged; the discharge ends of the coarse phosphate rock buffer bin I (101), the coarse phosphate rock buffer bin II (102) and the bulk material buffer bin (103) are connected with the feed end of the vertical mill (105) through a first large-inclination-angle belt conveyor (104); a smoke furnace (106) is arranged at one side of the vertical mill (105), and an exhaust port of the smoke furnace (106) is connected with an air inlet of the vertical mill (105) through a smoke pipe (107); the discharge port of the vertical mill (105) is connected with the feed port of the pulse belt dust collector (109) through a discharge air pipe (108); the bottom discharge end of the pulse belt type dust collector (109) is connected with the feed end of the batching unit (2).

2. The system according to claim 1, wherein: and an iron remover (111) is further arranged on the first large-inclination-angle belt conveyor (104).

3. The system according to claim 1, wherein: an explosion-proof air pipe (110) is also led out of the discharging air pipe (108), and an explosion-proof valve (112) is arranged on the explosion-proof air pipe (110); and/or

The exhaust port of the pulse belt type dust collector (109) is connected with a desulfurization and denitrification device (115) through a pulverized coal ventilator (113) and an outer exhaust pipe (114).

4. The system according to claim 1, wherein: the batching unit (2) comprises a mixed powder ore bin (201), a fine phosphate ore buffering bin (202) and a dust bin (203); the feeding end of the mixed powder ore bin (201) is connected with the bottom discharging end of the pulse belt dust collector (109) through a spiral feeder (204); the discharging ends of the mixed powder ore bin (201), the fine phosphate rock powder buffer bin (202) and the dust bin (203) are connected with the feeding end of the pelletizing unit (3) through a batching belt conveyor (205).

5. The system according to claim 4, wherein: the feeding end of the dust bin (203) is also provided with a dust receiving device (206).

6. The system according to claim 4, wherein: the pelletizing unit (3) comprises a strong mixer (301), a mixing bin (302) and a pelletizer (303); the feeding end of the intensive mixer (301) is connected with the discharging end of the batching belt conveyor (205), and the discharging end of the intensive mixer (301) is simultaneously connected with the feeding ends of a plurality of mixing bins (302) through a mixing belt conveyor (304) and a plurality of plow-shaped unloading devices (305); a pelletizer (303) is arranged below the discharge port of each mixing bin (302); the discharge ends of all the balling machines (303) are connected with the feed ends of the distributing units (4) through green ball belt conveyors (306).

7. The system according to claim 6, wherein: a metering scale (307) is arranged at the discharging end of the green ball belt conveyor (306); the pelletizer (303) is a disc pelletizer.

8. The system according to claim 6, wherein: the distributing unit (4) comprises a roller screening machine (401), a roller screening distributing machine (402) and a bottom paving bin (403); the feeding end of the roller type screening machine (401) is connected with the discharging end of the green ball belt type conveyor (306); the undersize material outlet of the roller type sieving machine (401) is connected with the feeding end of the roller type sieving distributor (402) through a wide-band type conveyor (404); the oversize material outlet of the roller type screening distributor (402) is connected with the feeding end of the roasting cooling unit (5) through an upper screening chute; the bottom spreading bin (403) is arranged in parallel with the roller type screening distributor (402), and a bottom discharge hole of the bottom spreading bin is connected with a feed end of the roasting cooling unit (5) through a bottom spreading distributing device (405), and the connection position of the bottom spreading bin and the feed end is positioned at the upstream of the connection position of a screen chute of the roller type screening distributor (402) and the feed end of the roasting cooling unit (5).

9. The system according to claim 8, wherein: the oversize material outlet of the roller screening machine (401) and the undersize material outlet of the roller screening distributor (402) are connected with the feeding end of the mixture belt conveyor (304) through a return belt conveyor (406).

10. The system according to claim 8, wherein: the mesh diameter of the roller type sieving machine (401) is 20-35mm; the mesh diameter of the roller type screening cloth machine (402) is 10-18mm.

11. The system according to claim 8, wherein: the mesh diameter of the roller type sieving machine (401) is 25-30mm; the mesh diameter of the roller type screening cloth machine (402) is 12-16mm.

12. The system according to claim 8, wherein: according to the trend of the materials, the roasting cooling unit (5) comprises a first drying section (501), a second drying section (502), a preheating section (503), a roasting soaking section (504), a first cooling section (505) and a second cooling section (506) which are sequentially connected in series; the upper parts of the drying first section (501), the drying second section (502), the preheating section (503), the roasting soaking section (504), the cooling first section (505) and the cooling second section (506) are covered with a fan housing (507) and are respectively provided with an independent air box (508) at the bottom.

13. The system according to claim 12, wherein: a bulk hopper (509) is also arranged below each bellows (508); a double-layer ash discharging valve (510) is arranged inside each bellows (508); the feeding end of the drying section (501) is connected with the feeding end of a screen chute of a roller type screening distributor (402) and a bedding distributing device (405).

14. The system according to claim 13, wherein: the system also comprises a hot air utilization unit (6), wherein the hot air utilization unit (6) comprises a cooling fan (601), a regenerative fan (602), a drying exhaust fan (603), a main exhaust fan (604), a multi-tube dust remover (605), a first cloth bag dust remover (606), a second cloth bag dust remover (607), a pipeline heating furnace (608) and a plurality of blast pipes; the cooling fan (601) is connected with a bottom air inlet of the cooling second section (506) through a first air supply pipe (L1) and a bottom air inlet of the cooling first section (505) through a second air supply pipe (L2); the top air outlet of the second cooling section (506) is connected with the top air inlet of the first drying section (501) through a third air supply pipe (L3), the bottom air outlet of the first drying section (501) is connected with the air inlet end of the first bag-type dust remover (606) through a fourth air supply pipe (L4), the air outlet end of the first bag-type dust remover (606) is connected with a chimney through a fifth air supply pipe (L5), and a drying exhaust fan (603) is arranged on the fifth air supply pipe (L5); the top air outlet of the cooling section (505) is connected with the top air inlet of the roasting and homogenizing section (504) through a sixth air supply pipe (L6) and is connected with the top air inlet of the preheating section (503) through a seventh air supply pipe (L7), and a pipeline heating furnace (608) is arranged on the sixth air supply pipe (L6); the bottom air outlet of the roasting soaking section (504) is connected with the air inlet of the multi-pipe dust remover (605) through an eighth air supply pipe (L8), the air outlet of the multi-pipe dust remover (605) is connected with the top air inlet of the drying second section (502) through a ninth air supply pipe (L9), and a regenerative fan (602) is arranged on the ninth air supply pipe (L9); the bottom air outlet of the preheating section (503) is connected with the air inlet end of the first bag-type dust collector (606) through a tenth air supply pipe (L10); the bottom air outlet of the second drying section (502) is connected with the air inlet end of the second bag-type dust collector (607) through an eleventh air supply pipe (L11), the air outlet end of the second bag-type dust collector (607) is connected with the desulfurization and denitrification device (115) through a twelfth air supply pipe (L12), and a main exhaust fan (604) is arranged on the twelfth air supply pipe (L12).

15. The system according to claim 14, wherein: the system also comprises a finished product screening unit (7), wherein the finished product screening unit (7) comprises a fixed screen (701) and a three-way feeder (702); the feeding end of the fixed screen (701) is connected with the discharging end of the cooling second section (506); the feeding end of the three-way feeder (702) is connected with a screen discharge port of the fixed screen (701) through a finished ore belt conveyor (703); the first discharge port of the three-way feeder (702) is connected with a finished product ore bin (706) through a finished product large-inclination-angle belt conveyor (704); the second discharge port of the three-way feeder (702) is connected with the feed end of the bottom paving bin (403) through a bottom paving large-inclination-angle belt conveyor (705).

16. The system according to claim 15, wherein: the system also comprises a bulk material collecting unit (8), wherein the bulk material collecting unit (8) comprises a bulk material belt conveyor (801), a bulk material large-inclination belt conveyor (802) and a bulk material bin (803); the feeding end of the bulk material belt conveyor (801) is simultaneously connected with the undersize discharge chute of the fixed screen (701) and the discharge ports of all the bulk hoppers (509); the discharging end of the bulk material belt conveyor (801) is connected with the bulk material bin (803) through the bulk material large-inclination-angle belt conveyor (802).

17. The system according to claim 15 or 16, characterized in that: the system also comprises a dust collecting unit (9), wherein the dust collecting unit (9) comprises a first dust pneumatic conveying pipeline (901), a second dust pneumatic conveying pipeline (902) and a third dust pneumatic conveying pipeline (903); the feeding end of the first dust pneumatic conveying pipeline (901) is connected with the dust outlet of the multi-pipe dust remover (605), and the other end of the first dust pneumatic conveying pipeline is connected with the feeding port of the dust bin (203); the feeding end of the second dust pneumatic conveying pipeline (902) is connected with the dust outlet of the first bag-type dust remover (606), and the other end of the second dust pneumatic conveying pipeline is connected with the feeding port of the dust bin (203); the feeding end of the third dust pneumatic conveying pipeline (903) is connected with the dust outlet of the second bag-type dust remover (607), and the other end of the third dust pneumatic conveying pipeline is connected with the feeding port of the dust bin (203); the feeding ends of the first dust pneumatic conveying pipeline (901), the second dust pneumatic conveying pipeline (902) and the third dust pneumatic conveying pipeline (903) are respectively and independently provided with a bin pump (904).