Ardealite flotation whitening device

Abstract

The utility model discloses an ardealite flotation whitening device which comprises an ardealite buffer tank, an ardealite conveying pump, a first plate-and-frame filter press, a conveying belt, a repulping tank, an ardealite flotation slurry pump, a first flotation tank, a second flotation tank and a second plate-and-frame filter press. The ardealite buffer tank is connected to the first plate-and-frame filter press through a conveying pump, solids obtained after filter pressing are conveyed to the re-pulping tank through a belt to be washed and re-pulped, and ore pulp obtained after re-pulping sequentially enters the first flotation tank and the second flotation tank through the flotation slurry pump and is finally separated and purified through the second plate-and-frame filter press. A stirrer, an inflation device and a liquid level meter are arranged in the device, flotation parameters can be accurately controlled, and organic matter, iron and silicon impurities are effectively removed. Part of the wastewater is recycled for slurry preparation, and part of the wastewater is conveyed to a sewage pipe network, so that resource recycling is realized. The ardealite treated by the device is suitable for the fields of building materials, chemical engineering and the like, has both environmental protection property and economical efficiency, and provides an efficient solution for high-value utilization of the ardealite.

Description

Technical Field

[0001] This utility model relates to the field of phosphorus chemical technology, specifically a phosphogypsum flotation whitening device. Background Technology

[0002] Phosphogypsum is a solid waste generated during the wet process of phosphoric acid production. Its main component is calcium sulfate dihydrate (CaSO4·2H2O), with a content exceeding 85%, making it a potentially valuable recycled gypsum resource. Currently, my country's phosphogypsum stockpiles exceed 800 million tons, and the amount is increasing at a rate of two times annually. The stockpiling of phosphogypsum not only occupies a large amount of land resources but also causes significant ecological and environmental problems. Solving the problems of phosphogypsum stockpiling and utilization is crucial for the sustainable development of the phosphorus chemical industry and for achieving ecological and carbon neutrality goals.

[0003] Methods for purifying and removing impurities from phosphogypsum generally include water washing, acid-base neutralization modification, calcination, and flotation. Water washing and acid-base neutralization modification can remove impurities such as soluble phosphorus, fluorine, and eutectic phosphorus, but cannot remove impurities in phosphogypsum that mainly affect its whiteness and purity, such as organic matter, iron, and silica. Calcination can remove organic matter from phosphogypsum, but it is costly. Flotation, as a highly efficient and low-cost method for material separation, is the most promising method for impurity removal due to its strong ability to remove various impurities, simplicity, high efficiency, and ease of industrialization. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a phosphogypsum flotation whitening device, which uses phosphogypsum as raw material and removes impurities and purifies phosphogypsum through reslurry and reverse flotation to improve the whiteness of phosphogypsum and realize the high-value application of phosphogypsum. In addition, part of the wastewater generated in the process is used for sewage treatment and part is used for initial phosphogypsum slurry preparation, so as to maximize the utilization of resources.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a phosphogypsum flotation whitening device, including a phosphogypsum buffer tank, the outlet of the phosphogypsum buffer tank being connected to a first plate and frame filter press via a pipeline, the solid outlet of the first plate and frame filter press being connected to the inlet of a reslurry tank, the discharge port of the reslurry tank being connected to a first flotation cell via a pipeline, the overflow outlet of the first flotation cell being connected to a second flotation cell, and the bottom collector outlet of the second flotation cell being connected to a second plate and frame filter press.

[0006] In a preferred embodiment, a phosphogypsum conveying pump is provided on the connecting pipe between the phosphogypsum buffer tank and the first plate and frame filter press, and a phosphogypsum flotation slurry pump is provided on the connecting pipe between the slurry tank and the first flotation tank.

[0007] In a preferred embodiment, the solid outlet of the first plate and frame filter press extends to the input end of the conveyor belt, and the output end of the conveyor belt is connected to the reslurry tank via a pipe.

[0008] In a preferred embodiment, both the phosphogypsum buffer tank and the re-slurry tank are equipped with a stirrer.

[0009] In a preferred embodiment, the first flotation cell and the second flotation cell are equipped with a stirring mechanism, an aeration mechanism, and a collector.

[0010] In a preferred embodiment, the liquid wastewater formed during solid-liquid separation in the first plate and frame filter press is transported to the wastewater renovation pipeline network via a drain pipe.

[0011] In a preferred embodiment, a portion of the liquid wastewater formed during solid-liquid separation in the second plate and frame filter press is returned to the initial phosphogypsum slurry to participate in slurry preparation.

[0012] In a preferred embodiment, reverse flotation is performed in the first flotation cell, and forward flotation is performed in the second flotation cell.

[0013] The phosphogypsum flotation whitening device provided by this utility model, by adopting the above-described structure, has the following beneficial effects:

[0014] (1) By combining reverse flotation and forward flotation, organic matter, iron and silicon impurities in phosphogypsum are effectively removed, significantly improving the whiteness and purity of phosphogypsum and meeting the high-value application needs of building materials, chemical industry and other fields.

[0015] (2) The wastewater separated by the first plate and frame filter press is sent to the wastewater renovation pipeline network, and the wastewater separated by the second plate and frame filter press is reused for initial slurry preparation, so as to achieve zero wastewater discharge and resource recycling, reduce environmental load, and help achieve the goal of "carbon neutrality".

[0016] (3) The use of pressure filtration followed by slurrying can effectively reduce the content of water-soluble impurities and reduce the amount of subsequent flotation reagents. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the overall elevation structure of this utility model.

[0019] In the diagram: 1. Phosphogypsum buffer tank; 2. Phosphogypsum transfer pump; 3. First plate and frame filter press; 4. Conveyor belt; 5. Resizing tank; 6. Phosphogypsum flotation slurry pump; 7. First flotation cell; 8. Second flotation cell; 9. Second plate and frame filter press; 10. Agitator. Detailed Implementation

[0020] like Figure 1Among them, a phosphogypsum flotation whitening device includes a phosphogypsum buffer tank 1 made of 904L material. The outlet of the phosphogypsum buffer tank 1 is connected to a first plate and frame filter press 3 through a pipe. The solid outlet of the first plate and frame filter press 3 is connected to the inlet of a reslurry tank 5. The discharge port of the reslurry tank 5 is connected to a first flotation cell 7 through a pipe. The overflow outlet of the first flotation cell 7 is connected to a second flotation cell 8. The bottom collector outlet of the second flotation cell 8 is connected to a second plate and frame filter press 9.

[0021] In a preferred embodiment, a phosphogypsum conveying pump 2 is provided on the connecting pipe between the phosphogypsum buffer tank 1 and the first plate and frame filter press 3, and a phosphogypsum flotation slurry pump 6 is provided on the connecting pipe between the reslurry tank 5 and the first flotation tank 7.

[0022] In a preferred embodiment, the solid outlet of the first plate and frame filter press 3 extends to the input end of the conveyor belt 4, and the output end of the conveyor belt 4 is connected to the reslurry tank 5 via a pipe.

[0023] In a preferred embodiment, both the phosphogypsum buffer tank 1 and the re-slurry tank 5 are equipped with a stirrer 10.

[0024] In a preferred embodiment, the first flotation cell 7 and the second flotation cell 8 are equipped with a stirring mechanism, an aeration mechanism, and a collector.

[0025] In a preferred embodiment, the liquid wastewater formed by solid-liquid separation in the first plate and frame filter press 3 is transported to the wastewater renovation pipeline network through a drain pipe.

[0026] In a preferred embodiment, a portion of the liquid wastewater formed during solid-liquid separation in the second plate and frame filter press 9 is returned to the initial phosphogypsum slurry to participate in slurry preparation.

[0027] In a preferred embodiment, reverse flotation is performed in the first flotation cell 7, and forward flotation is performed in the second flotation cell 8.

[0028] Based on the above device, its usage steps are as follows:

[0029] 1. Wash again with starch water

[0030] The prepared phosphogypsum slurry is sent to the phosphogypsum buffer tank 1 and thoroughly stirred. Then, it is pumped into the first plate and frame filter press 3 through the phosphogypsum transfer pump 2 for separation and impurity removal. Some water-soluble impurities in the phosphogypsum are removed. The wastewater containing water-soluble impurities is sent out for wastewater treatment. The phosphogypsum is sent to the re-slurry tank 5 through the conveyor belt 4 for re-slurrying. The solid content of the slurry is controlled to 30% by adding water.

[0031] II. Reverse Float

[0032] After re-pulping, the phosphogypsum slurry with a solid content of 30% is pumped into the first flotation cell 7 through the phosphogypsum flotation slurry pump 6. The stirring device in the first flotation cell 7 is kept at a speed of not less than 1500 rpm. A phosphogypsum decolorizing agent containing terpineol is added at a rate of 150-300 g / t (on a dry basis). After ensuring a residence time of 6-10 minutes, reverse flotation is carried out through an aeration device and a collector. At the same time, the height of the froth layer is controlled at 1-8 cm. The concentrate after flotation is sent to the second flotation cell 8 through the discharge.

[0033] Ensure the stirring speed of the second flotation cell 8 is not less than 1800 rpm, add amine collector for desilication of phosphogypsum at a rate of 150-300 g / t (dry basis), ensure a residence time of 6-10 min, and then carry out positive flotation through the aeration device and collector, while controlling the height of the froth layer to 1-8 cm. The flotation concentrate is sent to the second plate and frame filter press 9 for filtration and separation through the collector. The separated wastewater is reused in the initial phosphogypsum slurry for slurry preparation. The separated solid phosphogypsum is dried at 105℃ and has a whiteness ≥60% and CaO ≥35%.

Claims

1. A flotation whitening device for phosphogypsum, characterized in that: The system includes a phosphogypsum buffer tank (1), the outlet of which is connected to a first plate and frame filter press (3) via a pipe. The solid outlet of the first plate and frame filter press (3) is connected to the inlet of a reslurry tank (5). The outlet of the reslurry tank (5) is connected to a first flotation cell (7) via a pipe. The overflow outlet of the first flotation cell (7) is connected to a second flotation cell (8). The bottom collector outlet of the second flotation cell (8) is connected to a second plate and frame filter press (9).

2. The phosphogypsum flotation whitening device according to claim 1, characterized in that: A phosphogypsum conveying pump (2) is provided on the connecting pipe between the phosphogypsum buffer tank (1) and the first plate and frame filter press (3), and a phosphogypsum flotation slurry pump (6) is provided on the connecting pipe between the reslurry tank (5) and the first flotation tank (7).

3. The phosphogypsum flotation whitening device according to claim 1, characterized in that: The solid outlet of the first plate and frame filter press (3) extends to the input end of the conveyor belt (4), and the output end of the conveyor belt (4) is connected to the reslurry tank (5) through a pipe.

4. The phosphogypsum flotation whitening device according to claim 1, characterized in that: Both the phosphogypsum buffer tank (1) and the re-slurry tank (5) are equipped with a stirrer (10).

5. The phosphogypsum flotation whitening device according to claim 1, characterized in that: The first flotation cell (7) and the second flotation cell (8) are equipped with a stirring mechanism, an aeration mechanism and a collector.

6. The phosphogypsum flotation whitening device according to claim 1, characterized in that: The liquid wastewater formed by solid-liquid separation in the first plate and frame filter press (3) is transported to the wastewater renovation pipeline network through the drain pipe.

7. The phosphogypsum flotation whitening device according to claim 1, characterized in that: The liquid wastewater formed by solid-liquid separation in the second plate and frame filter press (9) is partially returned to the initial phosphogypsum slurry to participate in the slurry preparation.

8. The phosphogypsum flotation whitening device according to claim 1, characterized in that: Reverse flotation is performed in the first flotation cell (7), and forward flotation is performed in the second flotation cell (8).

Images