CN-224208232-U - Phosphogypsum flotation whitening device

Abstract

The utility model discloses an phosphogypsum flotation whitening device which comprises a phosphogypsum buffer tank, a phosphogypsum conveying pump, a first plate-and-frame filter press, a conveying belt, a reslurry tank, a phosphogypsum flotation slurry pump, a first flotation tank, a second flotation tank and a second plate-and-frame filter press. The phosphogypsum buffer tank is connected to the first plate-and-frame filter press through a conveying pump, the filter-pressed solids are conveyed to a reslurry tank through a belt to be washed and reslurry, and the reslurry pulp sequentially enters the first flotation tank and the second flotation tank through a flotation slurry pump and finally is separated and purified through the second plate-and-frame filter press. The device is provided with the stirrer, the air charging device and the liquid level meter, so that flotation parameters can be accurately controlled, and organic matters, iron and silicon impurities can be effectively removed. And part of the wastewater is recycled for slurry preparation, and the other part of the wastewater is sent to a sewage pipe network, so that the recycling of resources is realized. The phosphogypsum treated by the device is suitable for the fields of building materials, chemical industry and the like, has both environmental protection and economy, and provides a high-efficiency solution for high-value utilization of phosphogypsum.

Inventors

• WEI TIANRONG
• LIU YANQIN
• YAN LING
• ZHANG ZHIZI
• LIAO QIUSHI
• XIAO LINBO
• TIAN CHENGTAO
• Lu Bangyi
• WANG KUN
• MENG YANG
• HUANG QIN

Assignees

• 湖北三宁化工股份有限公司

Dates

Publication Date

20260508

Application Date

20250430

Claims (8)

1. 1. The phosphogypsum flotation whitening device is characterized by comprising a phosphogypsum buffer tank (1), wherein an outlet of the phosphogypsum buffer tank (1) is connected to a first plate-and-frame filter press (3) through a pipeline, a solid outlet of the first plate-and-frame filter press (3) is connected with an inlet of a reslurry tank (5), a discharge outlet of the reslurry tank (5) is connected with a first flotation tank (7) through a pipeline, an overflow outlet of the first flotation tank (7) is connected with a second flotation tank (8), and a collector outlet at the bottom of the second flotation tank (8) is connected with a second plate-and-frame filter press (9).
2. 2. The phosphogypsum flotation whitening device according to claim 1 is characterized in that a phosphogypsum conveying pump (2) is arranged on a connecting pipeline between the phosphogypsum buffer tank (1) and the first plate-and-frame filter press (3), and a phosphogypsum flotation slurry pump (6) is arranged on a connecting pipeline between the reslurry tank (5) and the first flotation tank (7).
3. 3. The phosphogypsum flotation whitening device according to claim 1, wherein the solid outlet of the first plate-and-frame filter press (3) extends to the input end of the conveying belt (4), and the output end of the conveying belt (4) is connected with the reslurry tank (5) through a pipeline.
4. 4. The phosphogypsum flotation whitening device according to claim 1, wherein the phosphogypsum buffer tank (1) and the reslurry tank (5) are provided with stirrers (10).
5. 5. The phosphogypsum flotation whitening device according to claim 1, characterized in that the first flotation tank (7) and the second flotation tank (8) are provided with stirring mechanisms, aeration mechanisms and collectors.
6. 6. The phosphogypsum flotation whitening device according to claim 1, wherein the liquid sewage part formed by solid-liquid separation in the first plate-and-frame filter press (3) is conveyed to a sewage reconstruction pipe network through a liquid discharge pipe.
7. 7. The phosphogypsum flotation whitening device according to claim 1, wherein the liquid sewage part formed by the solid-liquid separation in the second plate-and-frame filter press (9) is returned to the initial phosphogypsum pulp to participate in the slurry preparation.
8. 8. A phosphogypsum flotation whitening device according to claim 1, characterized in that the reverse flotation is performed in the first flotation cell (7) and the forward flotation is performed in the second flotation cell (8).

Description

Phosphogypsum flotation whitening device Technical Field The utility model relates to the technical field of phosphorus chemical industry, in particular to a phosphogypsum flotation whitening device. Background Phosphogypsum is a solid waste generated in the production process of phosphoric acid prepared by a wet process, the main component is calcium sulfate dihydrate (CaSO 4·2H2 O), the content of the phosphogypsum reaches more than 85%, and the phosphogypsum is a potential regeneration gypsum resource. Phosphogypsum stockpiles in China are over 8 hundred million t, and the annual stockpile quantity is increased at a double rate. The piling of phosphogypsum not only occupies a large amount of land resources, but also causes great ecological environment problem, and the problem of piling and utilizing phosphogypsum is very important for sustainable development of phosphorus chemical industry and realization of ecology and carbon neutralization target. The phosphogypsum purification and impurity removal method mainly comprises water washing, acid-base neutralization modification, calcination, floatation and the like. The impurities such as soluble phosphorus, fluorine, eutectic phosphorus and the like can be removed by washing with water and neutralizing and modifying with acid and alkali, but the impurities such as organic matters, iron, silicon dioxide and the like which mainly affect whiteness and purity in phosphogypsum cannot be removed, and the organic matters in phosphogypsum can be removed by a calcination method, but the cost is higher. The flotation method is used as a material separation method with high efficiency and low cost, and is the most promising impurity removal method because of the advantages of strong capability of removing various impurities, simplicity, high efficiency, easiness in industrialization and the like. Disclosure of Invention The utility model aims to solve the technical problem of providing the phosphogypsum flotation whitening device, which takes phosphogypsum as a raw material, removes impurities and purifies the phosphogypsum through reslurry and reverse-forward flotation, improves the whiteness of the phosphogypsum, realizes the high-valued application of the phosphogypsum, and realizes the maximum utilization of resources by using part of wastewater generated in the process for sewage transformation and part for initial phosphogypsum slurry preparation. In order to solve the technical problems, the phosphogypsum flotation whitening device comprises a phosphogypsum buffer tank, wherein an outlet of the phosphogypsum buffer tank is connected to a first plate-and-frame filter press through a pipeline, a solid outlet of the first plate-and-frame filter press is connected with an inlet of a reslurry tank, a discharge outlet of the reslurry tank is connected with a first flotation tank through a pipeline, an overflow outlet of the first flotation tank is connected with a second flotation tank, and an outlet of a collector at the bottom of the second flotation tank is connected with the second plate-and-frame filter press. In the preferred scheme, phosphogypsum delivery pump is arranged on a connecting pipeline between the phosphogypsum buffer tank and the first plate-and-frame filter press, and phosphogypsum flotation slurry pump is arranged on a connecting pipeline between the slurry tank and the first flotation tank. In the preferred scheme, the solid outlet of the first plate-and-frame filter press extends to the input end of a conveying belt, and the output end of the conveying belt is connected with a reslurry tank through a pipeline. In the preferred scheme, the phosphogypsum buffer tank and the reslurry tank are both provided with stirrers. In a preferred embodiment, the first flotation tank and the second flotation tank are provided with a stirring mechanism, an aeration mechanism and a collector. In the preferred scheme, the liquid sewage part formed by solid-liquid separation in the first plate-and-frame filter press is conveyed to a sewage transformation pipe network through a liquid discharge pipe. In the preferred scheme, the liquid sewage part formed by the solid-liquid separation in the second plate-and-frame filter press is returned to the initial phosphogypsum pulp to participate in the pulp preparation. In a preferred embodiment, the first flotation cell is subjected to reverse flotation, and the second flotation cell is subjected to forward flotation. The phosphogypsum flotation whitening device provided by the utility model has the following beneficial effects by adopting the structure: (1) Organic matters, iron and silicon impurities in phosphogypsum are effectively removed by a combined process of reverse flotation and forward flotation, the whiteness and purity of phosphogypsum are obviously improved, and the high-value application requirements in the fields of building materials, chemical industry and the like are met; (2) The sewage separated by t