CN205398469U - Ardealite system of processing - Google Patents

Abstract

The utility model discloses a phosphogypsum processing system, which comprises a raw material warehouse, a vibrating screening machine, a predryer, a calciner and a heating system. The material inlet of the dryer is connected, the material outlet of the pre-dryer is connected with the material inlet of the calciner, the finished product outlet of the calciner is connected with the finished product warehouse, the hot air inlet of the calciner is connected with the heating system through a pipeline, and the pre-dryer is connected with a Exhaust gas purification system, this utility model uses secondary vibration screening to screen phosphogypsum, the particle size of phosphogypsum after vibration screening can fully meet the process requirements, and is not affected by the humidity of phosphogypsum, avoiding the traditional dispersing machine It may be difficult to break up, and the broken phosphogypsum will be agglomerated again. The high-temperature hot air discharged from the calciner is introduced into the pre-heater to preheat the phosphogypsum particles, which greatly improves the utilization rate of fuel.

Description

A phosphogypsum processing system

technical field

The utility model relates to the field of phosphogypsum processing equipment, in particular to a phosphogypsum processing system.

Background technique

Phosphogypsum is the main industrial by-product when phosphate and compound fertilizer enterprises use phosphate rock and sulfuric acid as raw materials to produce phosphoric acid. The wet-process phosphoric acid production process is to produce extraction slurry by decomposing phosphate rock powder with sulfuric acid, and then filtering to obtain phosphoric acid, which is filtered and washed. Phosphogypsum waste is generated during the process. With the development of ammonium phosphate industry and high-concentration phosphate compound fertilizer, the discharge of phosphogypsum is increasing year by year. At present, the annual increase of phosphogypsum discharge in the world is 280 million tons, and China is about 50 million tons. It accounts for 20% of the world's annual emissions of phosphogypsum. A large amount of phosphogypsum is stacked, which not only occupies land resources, but also increases the huge economic burden on enterprises, and also causes certain pollution to the environment. For a long time, phosphogypsum has not been well used in my country, and the utilization rate is only 10%, and the annual utilization is only 10%. 4-5 million tons, the discharge of phosphogypsum has become an important factor restricting the production of phosphate fertilizer, and it is of great significance to develop a practical comprehensive utilization technology of phosphogypsum.

At present, calcination of phosphogypsum to make gypsum powder and further application in construction, chemical industry, mold and other industries is one of the effective ways to deal with waste phosphogypsum. One of the more advanced technologies for calcining phosphogypsum is compartmental calcination. Phosphogypsum must be dispersed by a disintegrator before entering the calciner. The particle size of the phosphogypsum meets the requirements of the feed before entering the calciner. However, due to the high humidity of the phosphogypsum, it is difficult to disperse, and the dispersed phosphogypsum It is easy to agglomerate again and the calcining effect is often unsatisfactory.

Utility model content

In order to solve the above technical problems, the utility model provides a phosphogypsum processing system that can effectively improve the calcination efficiency.

The technical solution is as follows: a phosphogypsum processing system, the key of which is: including a raw material bin, a vibrating screening machine, a pre-dryer, a calciner and a heating system, the outlet of the raw material bin is connected to the vibrating screening machine, the vibrating The discharge port of the sieving machine is connected with the material inlet of the pre-dryer, the material outlet of the pre-dryer is connected with the material inlet of the calciner, the finished product discharge port of the calciner is connected with a finished product storehouse, and the hot air of the calciner The inlet is connected to the heating system through a pipeline, and the pre-dryer is connected to an exhaust gas purification system. The beneficial effect of adopting this technical solution is that the phosphogypsum processing system uses vibration screening to screen phosphogypsum, and the particle size of phosphogypsum after vibration screening can fully meet the process requirements, and is not affected by the humidity of phosphogypsum, avoiding Traditional dispersing machines may have adverse effects such as difficulty in dispersing, and re-agglomeration of phosphogypsum after dispersing.

As a preference: the above-mentioned vibrating screening machine includes a first vibrating screening machine and a second vibrating screening machine, the discharge port of the first vibrating screening machine is connected with the feeding port of the second vibrating screening machine, and the first vibrating screening machine The screen mesh number of the screening machine is smaller than the screen mesh number of the second vibrating screening machine, the discharge port of the second vibrating screening machine is connected with the material inlet of the pre-dryer, and the discharge port of the raw material bin The port is connected with the feed port of the first vibrating screener. Using this scheme to gradually screen out the phosphogypsum with the required particle size through two vibration screenings can effectively avoid the influence of low screening rate that may occur due to the high humidity of the phosphogypsum sticking to each other during the first screening, and greatly improve the screening efficiency. .

The particle size of the undersize of the above-mentioned first vibrating screener is less than or equal to 2 cm, and the particle size of the undersize of the second vibrating screener is less than or equal to 5 mm. Using this scheme, put the phosphogypsum with a particle size less than or equal to 2 cm screened out by the first screening machine into the second vibrating screen machine, and put the phosphogypsum with a particle size less than or equal to 5 mm screened out through the second screening into the next processing procedure In this way, gypsum powder that meets the requirements can be produced.

The tail air outlet of the above-mentioned calciner is connected with the pre-drying air inlet of the pre-dryer through a pipeline. Using this scheme, the high-temperature hot air discharged from the calciner is introduced into the pre-heater to preheat the phosphogypsum particles to make the humidity meet the requirements, which not only avoids the greenhouse effect that may be caused by the direct discharge of hot air, but also greatly improves the fuel efficiency. utilization rate.

The pre-drying air inlet of the above-mentioned pre-dryer is connected to the heating system through a heating pipeline, and a hot air control valve is arranged on the heating pipeline. With this scheme, when the temperature of the hot air discharged from the calciner is not enough to reduce the humidity of phosphogypsum to the required value of the process, the hot air control valve can be opened to allow part of the high-heat hot air in the heating system to enter the pre-heater to increase the hot air in the pre-heater Temperature, so that the humidity of the pretreated phosphogypsum drops to the target value.

The above-mentioned heating system includes a coal bunker, a coal crusher, a hoist and a coal feeder connected in series, and the coal feeder is connected with a fluidized furnace, and the hot air outlet of the fluidized furnace is connected with the hot air inlet of the calciner through a pipeline, and the fluidized furnace The air inlet is connected with a blower. Using this scheme, the entire heating system adopts mechanized control, which greatly reduces the intensity of manual labor and improves work efficiency.

The exhaust gas purification system above includes a cyclone separator, a bag filter and a spray tower connected in sequence, the cyclone separator is connected to the pre-dryer, and the waste water outlet of the spray tower is connected to a heat exchanger. With this design, the waste gas containing a large amount of dust, sulfur and other impurities discharged from the pre-dryer can basically meet the discharge standard after being treated by the cyclone separator, bag filter and spray tower, and the wastewater with a higher temperature discharged from the spray tower Entering the heat exchanger, the clean water in the heat exchanger is heated by heat exchange, and the heated clean water can be used for bathing, etc., thus further improving the fuel utilization efficiency.

The ash discharge pipe of the cyclone separator is connected with the pre-dryer. Using this scheme, the phosphogypsum powder separated by the cyclone separator enters the phosphogypsum processing system again, which avoids the waste of raw materials and improves the utilization rate of raw materials.

A leather conveyor is provided between the second vibrating screening machine and the pre-dryer. The raw materials screened out by the second vibrating screening machine are transported to the pre-dryer by the leather transporter, which greatly reduces the intensity of manual labor.

The above-mentioned calciner is a compartmentalized calciner, and a material conveying device is provided between the compartmentalized calciner and the finished product warehouse, and the material conveying device transports the finished gypsum powder to the finished product warehouse. Using this scheme, the finished gypsum powder is transported to the finished product warehouse through the material conveying device. The entire transportation process is fully controlled by mechanization, which greatly reduces the intensity of manual labor and effectively improves work efficiency.

Beneficial effects: the phosphogypsum processing system of the utility model uses secondary vibration screening to screen phosphogypsum, and the particle size of the phosphogypsum after vibration screening can fully meet the process requirements, and is not affected by the humidity of the phosphogypsum, avoiding In order to eliminate the adverse effects of traditional dispersing machines such as difficulty in dispersing and re-agglomeration of phosphogypsum after dispersing, the high-temperature hot air discharged from the calciner is introduced into the pre-heater to preheat the phosphogypsum particles to make the humidity meet the requirements. Requirements, not only avoid the adverse impact of hot air directly discharged on the environment, but also greatly improve the utilization rate of fuel. After the tower is treated, it can basically meet the discharge standard, and the high-temperature wastewater discharged from the spray tower enters the heat exchanger, and the clean water in the heat exchanger is heated by heat exchange. The heated clean water can be used for bathing, etc. , thus further improving the fuel utilization efficiency.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

Below in conjunction with embodiment and accompanying drawing, the utility model is further described.

As shown in Figure 1, a kind of phosphogypsum processing system comprises a raw material bin 1, a vibrating screening machine 2, a pre-dryer 4, a calciner 8 and a heating system, and the discharge port of the raw material bin 1 is connected with the vibrating screening machine 2 , the discharge port of the vibratory screening machine 2 is connected with the material inlet of the predryer 4, the material outlet of the predryer 4 is connected with the material inlet of the calciner 8, and the finished product discharge port of the calciner 8 is connected with The finished product warehouse 11, the hot air inlet of the calciner 8 is connected to the heating system through a pipeline, and the pre-dryer 4 is connected to an exhaust gas purification system.

Described vibratory screening machine 2 comprises the first vibrating screening machine 21 and the second vibrating screening machine 22, the discharge opening of described first vibrating screening machine 21 is connected with the feed inlet of described second vibrating screening machine 22, described The screen mesh number of the first vibration screening machine 21 is less than the screen mesh number of the second vibration screening machine 22, and the discharge port of the second vibration screening machine 22 is connected with the material inlet of the predryer 4, The discharge port of the raw material bin 1 is connected to the feed port of the first vibrating screening machine 21, the particle size of the under-screened material of the first vibrating screening machine 21 is less than or equal to 2 cm, and the second vibrating screening machine 22 The particle size of the passing material under the sieve is less than or equal to 5 mm. A leather conveyor 3 is provided between the second vibrating screening machine 22 and the pre-dryer 4. During work, the particles screened out by the first vibrating screening machine 21 The material with a diameter of less than or equal to 2 cm is put into the second vibrating screening machine 22 and continues to be sieved, and the material with a particle size of less than or equal to 5 mm screened out by the second vibrating screening machine 22 is transported to the pre-dryer 4 through the skin conveyor 3 Drying with hot air reduces the humidity of the phosphogypsum until it meets the process requirements.

The tail air outlet b of the calciner 8 is connected to the pre-drying air inlet a of the pre-dryer 4 through a pipeline, and the pre-drying air inlet a of the pre-dryer 4 is connected to the heating system through a heating pipeline, The heating pipeline is provided with a hot air control valve 18, and the heating system includes a coal bunker 17, a coal crusher 14, a hoist 13, and a coal feeder 12 connected in series, and the coal feeder 12 is connected with a fluidized fluidized furnace 10. The hot blast outlet of fluidized fluidized furnace 10 is connected with the hot blast inlet of described calciner 8 through pipeline, and the air inlet of described fluidized fluidized furnace 10 is connected with air blower 15, and described calciner 8 is compartmentalized calciner, and this compartmentalized calciner and described finished product warehouse 11 A material delivery device 9 is arranged between them, and the material delivery device 9 transports the finished gypsum powder to the finished product storehouse 11 .

The exhaust gas purification system includes a cyclone separator 5, a bag filter 6 and a spray tower 7 connected in sequence, the cyclone separator 5 is connected to the pre-dryer 4, and the waste water outlet of the spray tower 7 is connected to a Heater 16, the ash discharge pipe of the cyclone separator 5 is connected with the pre-dryer 4.

Finally, it should be noted that the above description is only a preferred embodiment of the utility model, and under the inspiration of the utility model, those skilled in the art can make many A similar representation, such transformations all fall within the protection scope of the present utility model.

Claims (10)

1. an ardealite system of processing, it is characterized in that: include raw material cabin (1), vibrating screen classifier (2), pre-dryer (4), calcining furnace (8) and heating system, the discharging opening of described raw material cabin (1) is connected with vibrating screen classifier (2), the discharging opening of described vibrating screen classifier (2) is connected with the material inlet of pre-dryer (4), the material outlet of described pre-dryer (4) is connected with the material inlet of calcining furnace (8), the finished product discharging opening of this calcining furnace (8) is connected to warehouse for finished product (11), the hot-wind inlet of described calcining furnace (8) is connected with heating system by pipeline, described pre-dryer (4) is connected to waste gas cleaning system.

2. a kind of ardealite system of processing according to claim 1, it is characterized in that: described vibrating screen classifier (2) includes the first vibrating screen classifier (21) and the second vibrating screen classifier (22), the discharging opening of described first vibrating screen classifier (21) is connected with the charging aperture of described second vibrating screen classifier (22), the sieve number of described first vibrating screen classifier (21) is less than the sieve number of described second vibrating screen classifier (22), the discharging opening of described second vibrating screen classifier (22) is connected with the material inlet of described pre-dryer (4), the discharging opening of described raw material cabin (1) and the charging aperture of the first vibrating screen classifier (21) connect.

3. a kind of ardealite system of processing according to claim 2, it is characterized in that: by thing particle diameter less than or equal to 2 centimetres under the sieve of described first vibrating screen classifier (21), by thing particle diameter less than or equal to 5 millimeters under the sieve of described second vibrating screen classifier (22).

4. a kind of ardealite system of processing according to claim 1, it is characterised in that: a tail wind outlet (b) of described calcining furnace (8) is connected by the predrying air inlet (a) of pipeline with described pre-dryer (4).

5. a kind of ardealite system of processing according to claim 4, it is characterized in that: the predrying air inlet (a) of described pre-dryer (4) is connected with described heating system by heat supply pipeline, this heat supply pipeline is provided with hot blast control valve (18).

6. a kind of ardealite system of processing according to claim 1, it is characterized in that: described heating system includes the coal bunker (17), coal breaker (14), elevator (13) and the feeder (12) that are sequentially connected in series, described feeder (12) is connected to fluidized bed furnace (10), the hot-blast outlet of this fluidized bed furnace (10) is connected with the hot-wind inlet of described calcining furnace (8) by pipeline, and the air inlet of described fluidized bed furnace (10) is connected to aerator (15).

7. a kind of ardealite system of processing according to claim 1, it is characterized in that: described waste gas cleaning system includes the cyclone separator (5), sack cleaner (6) and the spray column (7) that are sequentially connected with, described cyclone separator (5) is connected with described pre-dryer (4), and the wastewater outlet of this spray column (7) is connected to heat exchanger (16).

8. a kind of ardealite system of processing according to claim 7, it is characterised in that: the ash releasing tube of described cyclone separator (5) is connected with described pre-dryer (4).

9. a kind of ardealite system of processing according to claim 2, it is characterised in that: it is provided with Pi Yunji (3) between described second vibrating screen classifier (22) and described pre-dryer (4).

10. a kind of ardealite system of processing according to claim 1, it is characterized in that: described calcining furnace (8) is locellus calcining furnace, being provided with device for transporting objects (9) between this locellus calcining furnace and described warehouse for finished product (11), finished product Gypsum Fibrosum powder is transported to warehouse for finished product (11) by this device for transporting objects (9).