CN211056972U - Phosphogypsum roasting system - Google Patents

Abstract

A phosphogypsum roasting system comprises a roasting furnace, the roasting furnace is provided with a feeding port and a discharging port, a finished product transport device is arranged at the discharging port, and the finished product transport device transports the finished product to a finished product warehouse; a burner is provided at the bottom of the roasting furnace , the burner provides a heat source for the roaster, the top of the roaster is connected to the dust collector through a pipeline, the dust collector is a multi-stage dust collector, the dust collector at least includes two-stage discharge ports, and the first-stage discharge port of the dust collector is connected to the first conveyor through the first conveyor. The feeding port is connected, and the secondary discharge port of the dust collector is communicated with the inlet of the finished product conveying device through the second conveyor. The system can collect phosphogypsum powder dust, improve the yield of finished products, and also improve the quality of finished products.

Description

Phosphogypsum Roasting System

technical field

The utility model belongs to the field of phosphogypsum manufacturing technology, in particular to a phosphogypsum roasting system.

Background technique

Phosphogypsum is a solid waste discharged from the production of phosphate fertilizers and phosphoric acid. With the development and utilization of phosphogypsum, gypsum powder can be used in building decoration projects and the production of decorative products and gypsum boards. With the impending ban of clay bricks nationwide , the market space for gypsum wall applications will be larger. As the basic raw material of various gypsum products, building gypsum has a huge demand market; phosphogypsum instant wallboard can be widely used in various industrial and civil buildings.

The phosphogypsum needs to go through a roasting process, and the semi-wet phosphogypsum material is roasted into a dry phosphogypsum powder product, which is then sold to the outside world. The existing phosphogypsum roasting process is prone to waste of phosphogypsum powder, and the yield is not high.

SUMMARY OF THE INVENTION

In view of the technical problems existing in the background art, the phosphogypsum roasting system provided by the utility model can collect phosphogypsum powder dust, improve the yield of finished products, and also improve the quality of finished products.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions to realize:

A phosphogypsum roasting system includes a roasting furnace, the roasting furnace is provided with a feeding port and a discharging port, a finished product transport device is arranged at the discharging port, and the finished product transport device transports the finished product to a finished product warehouse; a burner is provided at the bottom of the roasting furnace , the burner provides a heat source for the roaster, the top of the roaster is connected to the dust collector through a pipeline, the dust collector is a multi-stage dust collector, the dust collector at least includes two-stage discharge ports, and the first-stage discharge port of the dust collector is connected to the first conveyor through the first conveyor. The feed port is connected, and the secondary discharge port of the dust collector is communicated with the inlet of the finished product conveying device through the second conveyor.

In a preferred solution, the burner is a direct-fired hot blast stove, and the direct-fired hot blast stove is provided with an air source by a fan.

In a preferred solution, the dust collector is a two-stage bag filter.

In a preferred solution, the two-stage bag filter is provided with an air inlet and an air outlet, the air inlet is communicated with the top of the roaster through a pipeline, and the air outlet is communicated with the exhaust gas purification device.

In a preferred solution, the tail gas purification device is a spray absorption tower.

In a preferred solution, a screening device is provided between the finished product transport device and the finished product warehouse, the inlet of the screening device is connected with the finished product transport device, the outlet of the screening device is communicated with the finished product warehouse, and the material return port of the screening device It communicates with the feed port of the roaster.

This patent can achieve the following beneficial effects:

Put the semi-wet phosphogypsum to be roasted into the roasting furnace for roasting, the burner provides a heat source, and the semi-wet phosphogypsum is dried. The dust particles of the received materials are relatively large, and the dust of the materials can be continuously returned to the roasting furnace for continuous roasting; the discharge ports of other levels transport the dust materials to the finished product transport device. The process can avoid the waste of gypsum dust and improve the yield.

In order to ensure the quality of phosphogypsum powder in this technical scheme, a screening device is added to screen the phosphogypsum powder. The qualified phosphogypsum powder is transported to the finished product warehouse by the finished product transportation device, and the unqualified phosphogypsum powder enters the roasting furnace to continue. Roasting. Further improve the quality of finished products.

Description of drawings

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

Fig. 1 is the system structure diagram of the utility model.

In the figure: roaster 1, feed port 101, discharge port 102, burner 2, fan 201, dust collector 3, first conveyor 41, second conveyor 42, finished product transport device 5, exhaust gas purification device 6, finished product warehouse 7. Screening device 8, return conveyor 9.

Detailed ways

A preferred solution is shown in Fig. 1, a phosphogypsum roasting system includes a roasting furnace 1, the roasting furnace 1 is provided with a feeding port 101 and a discharging port 102, and a finished product transportation device 5 is arranged at the discharging port 102, and the finished product is transported The device 5 transports the finished product to the finished product warehouse 7; the bottom of the roasting furnace 1 is provided with a burner 2, the burner 2 provides a heat source for the roasting furnace 1, and the top of the roasting furnace 1 is communicated with the dust collector 3 through a pipeline, and the dust collector 3 is a multi-stage dust collector , the dust collector 3 includes at least two-stage discharge ports, the first-level discharge port of the dust collector 3 is communicated with the feed port 101 through the first conveyor 41, and the second-level discharge port of the dust collector 3 is transported with the finished product through the second conveyor 42 The inlet of the device 5 is connected. In this technical solution, the dust collector 3 is used, and its main purpose is not to remove dust, but to collect the material dust in the roasting furnace 1 . A part of the material dust with relatively large particles is returned to the roasting furnace 1 for roasting, while the material dust with small particles is collected in the finished product transport device 5 for transportation.

Further, the burner 2 is a direct-fired hot blast stove, and the direct-fired hot blast stove is provided with an air source by a fan 201 . The working principle of the direct-fired hot blast stove is as follows: the direct-fired hot blast stove is composed of a coal burner, a high temperature gas purification sedimentation chamber and a mixed air chamber. The exhaust is sent into the combustion chamber at a uniform speed, and it is violently burned under the action of the air blown by the blower. The dusty high-temperature flue gas generated by the coal combustion enters the high-temperature gas purification and settling chamber; the high-temperature gas purification and settling chamber is made of refractory materials. The gas undergoes secondary combustion in the purification room, and a small amount of dust entrained in the flue gas is polymerized and precipitated at high temperature in the purification room; the clean hot air from the purification room is mixed with a certain amount of cold air, which can provide clean hot flue gas of different temperatures, which can be used for cleaning. Various large-scale roasting systems such as fluidized bed, flash evaporation, spray tower, rotary cylinder, drying room, air dryer, etc. provide heat sources, and dry the materials. The direct-fired hot blast stove has high heat utilization rate and can reduce the cost of the entire installation.

Further, the dust collector 3 is a two-stage bag filter. The bag filter is a dry dust filter. It is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of woven filter cloth or non-woven felt, and the dust-containing gas is filtered by the filtering effect of the fiber fabric. The action settles down and falls into the ash hopper. Because there are many sizes and specifications of bag-type dust collectors, and the number of discharge ports includes one or more, the bag-type dust collector selected in this technical solution has at least two discharge ports. The two-stage bag filter is provided with an air inlet and an air outlet, the air inlet communicates with the top of the roasting furnace 1 through a pipeline, and the air outlet communicates with the exhaust gas purification device 6 . The material dust particles collected at the discharge port near the air inlet are relatively large, and the material dust can continue to be returned to the roasting furnace 1 to continue roasting.

Further, the exhaust gas purification device 6 is a spray absorption tower. In the production process of phosphogypsum, acidic, toxic and harmful exhaust gas will be generated. The spray absorption tower mainly uses lye to neutralize the exhaust gas, so as to achieve the purpose of purification.

Further, a screening device 8 is provided between the finished product transport device 5 and the finished product warehouse 7, the inlet of the screening device 8 is communicated with the finished product transport device 5, the outlet of the screening device 8 is communicated with the finished product warehouse 7, and the The material returning port is communicated with the feeding port 101 of the roasting furnace 1 . The screening device 8 can screen out qualified phosphogypsum powder, and the screening device 8 generally adopts an ultrasonic vibration screening machine.

The whole device works as follows:

The semi-wet phosphogypsum that needs to be roasted is put into the roasting furnace 1 for roasting, the burner 2 provides a heat source, and the semi-wet phosphogypsum is dried. is collected. The two-stage bag filter is provided with an air inlet and an air outlet, the air inlet communicates with the top of the roasting furnace 1 through a pipeline, and the air outlet communicates with the exhaust gas purification device 6 . The material dust particles collected by the discharge port near the air inlet are relatively large, and the material dust can continue to be returned to the roasting furnace 1 for continuous roasting; other discharge ports of the bag filter transport the dust material to the finished product transport device 5 . In this technical scheme, in order to ensure the quality of phosphogypsum powder, a screening device 8 is added to screen the phosphogypsum powder. The qualified phosphogypsum powder is transported by the finished product transportation device 5 to the finished product warehouse, and the unqualified phosphogypsum powder enters the roasting process. The furnace continues to roast. The first conveyor 41 , the second conveyor 42 and the finished product transportation device 5 in the technical method can all use screw conveyors. The return conveyor 9 at the return port of the screening device 8 can rotate the bucket conveyor to return the unqualified materials to the roasting furnace 1 .

Claims (6)

1. A phosphogypsum roasting system comprises a roasting furnace (1), wherein the roasting furnace (1) is provided with a feeding hole (101) and a discharging hole (102), a finished product conveying device (5) is arranged at the discharging hole (102), and the finished product conveying device (5) conveys a finished product to a finished product bin (7); roaster (1) bottom is equipped with combustor (2), and combustor (2) provide the heat source for roaster (1), its characterized in that: the top of the roasting furnace (1) is communicated with the dust remover (3) through a pipeline, the dust remover (3) is a multi-stage dust remover, the dust remover (3) at least comprises two-stage discharge holes, the one-stage discharge hole of the dust remover (3) is communicated with the feed inlet (101) through a first conveyor (41), and the two-stage discharge hole of the dust remover (3) is communicated with the inlet of the finished product conveying device (5) through a second conveyor (42).

2. The phosphogypsum roasting system according to claim 1, characterized in that: the burner (2) is a direct-combustion hot blast stove which is provided with an air source by a fan (201).

3. The phosphogypsum roasting system according to claim 2, characterized in that: the dust remover (3) is a two-stage cloth bag type dust remover.

4. The phosphogypsum roasting system according to claim 3, characterized in that: the two-stage bag type dust collector is provided with an air inlet and an air outlet, the air inlet is communicated with the top of the roasting furnace (1) through a pipeline, and the air outlet is communicated with the tail gas purification device (6).

5. The phosphogypsum roasting system according to claim 4, characterized in that: the tail gas purification device (6) is a spray absorption tower.

6. The phosphogypsum roasting system according to claim 1, characterized in that: a screening device (8) is arranged between the finished product conveying device (5) and the finished product bin (7), an inlet of the screening device (8) is communicated with the finished product conveying device (5), an outlet of the screening device (8) is communicated with the finished product bin (7), and a material returning port of the screening device (8) is communicated with a material inlet (101) of the roasting furnace (1).

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