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Defoaming and adding method and defoaming and adding device for wet-process phosphoric acid extraction reaction

A technology of wet-process phosphoric acid and feeding method, which is applied in the direction of chemical instruments and methods, liquid solution solvent extraction, phosphorus compounds, etc. It can solve the problems of affecting the heat dissipation of slurry, difficult to eliminate foam, and splashing of sulfuric acid, so as to speed up cooling and reduce Corrosion, effect that favors dissipation

Active Publication Date: 2018-08-28
SICHUAN MIANZHU PANLONG MINERALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The production process of wet-process phosphoric acid is to use phosphate rock and sulfuric acid to react in the extraction tank to produce phosphoric acid. Because phosphate rock contains organic matter and carbonate minerals, a large amount of C02 gas is produced when carbonate reacts with sulfuric acid, and these gases are produced. The organic matter in the phosphate rock is fixed into a foam, which is difficult to burst, and forms a foam layer of varying thickness in the gas phase space of the extraction tank, and sometimes rises out of the tank, which seriously affects the heat dissipation of the slurry, poor smoke exhaust, and difficult filtration.
[0003] At present, when extracting and adding sulfuric acid, most of the methods are directly added to the surface of the phosphate rock slurry and then mixed, so that the foam generated when the two materials react rapidly always stays on the surface of the slurry and is difficult to eliminate. This method has the following disadvantages: 1. During the feeding process, the foam produced by the rapid reaction of the two materials in contact always stays on the surface of the slurry and is difficult to eliminate; 2. When adding acid, sulfuric acid splashes to the tank wall, causing serious corrosion of the tank wall

Method used

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  • Defoaming and adding method and defoaming and adding device for wet-process phosphoric acid extraction reaction
  • Defoaming and adding method and defoaming and adding device for wet-process phosphoric acid extraction reaction
  • Defoaming and adding method and defoaming and adding device for wet-process phosphoric acid extraction reaction

Examples

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Effect test

Embodiment 1

[0029] A kind of defoaming feeding method of wet process phosphoric acid extraction reaction, this defoaming feeding method comprises the following steps:

[0030] (1) Phosphate slurry is added in the extraction tank;

[0031] (2) Add sulfuric acid into the phosphate rock slurry from the lower part of the extraction tank. Sulfuric acid is added from the lower part of the extraction tank, avoiding the traditional method of adding liquid surface, so that the phosphate rock slurry and sulfuric acid react violently on the liquid surface to produce a large amount of foam accumulation. The present invention uses this adding method to make the phosphate rock slurry and sulfuric acid Reaction below the liquid surface, when the foam generated during the reaction overflows from the slurry, the slurry will squeeze it to destroy the formation of the foam, and finally form a gas on the surface of the slurry and discharge it, which fundamentally solves the problem of the extraction tank. b...

Embodiment 2

[0034] An extraction tank with a submerged feeding device, comprising an extraction tank 1, and a submerged feeding device arranged on the outer wall of the extraction tank 1, the submerged feeding device includes a feeding body 2, and the feeding body (2 ) is provided with a feeding port 3 and an air outlet 5, and the bottom of the feeding body 2 is provided with a feeding pipe 4 communicating with the bottom of the extraction tank 1; a stirring shaft 11 is arranged in the extraction tank 1, and There are several stirring blades 12, and several spikes 13 are arranged on the stirring blades 12, and one end of the feeding pipe 4 extends between two adjacent stirring blades 12 in the extraction tank 1, and the top of the extraction tank 1 is provided with The driving device that drives the stirring shaft 11 to stir, and the driving device is a motor 14 .

[0035] Working principle: When phosphate rock and sulfuric acid in wet-process phosphoric acid react in extraction tank 1, t...

Embodiment 3

[0039] Further optimization on the basis of Example 1, in this embodiment, the feed inlet 3 is arranged on the side of the feeding body 2, the air outlet 6 is arranged on the top of the feeding body 2, and an exhaust fan is arranged at the air outlet 5 6. Because if the exhaust fan 6 is arranged on the side, and the feed port 3 is arranged on the top, that is to say, the position of the draft port 5 is lower than the feed port 3, so that the added material may flow out from the draft port 5, therefore, like this The unique design ensures that the added material does not flow out from the air outlet 5, ensuring smooth feeding and ventilation.

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Abstract

The invention discloses a method for defoaming a wet-process phosphoric acid extraction reaction. The adding method comprises the following steps: firstly, adding phosphoric ore pulp into an extraction tank; secondly, adding sulfuric acid into the phosphoric ore pulp from the lower part of the extraction tank; adding the sulfuric acid into the extraction tank (1) from a liquid feeding device. By adopting a liquid feeding method, foams are greatly reduced so as to eliminate adverse influence in the extraction process.

Description

technical field [0001] The invention relates to the technical field of wet-process phosphoric acid production, in particular to a defoaming and feeding method for wet-process phosphoric acid extraction reaction and a device thereof. Background technique [0002] The production process of wet-process phosphoric acid is to use phosphate rock and sulfuric acid to react in the extraction tank to produce phosphoric acid. Because phosphate rock contains organic matter and carbonate minerals, a large amount of C02 gas is produced when carbonate reacts with sulfuric acid, and these gases are produced. The organic matter in the phosphate rock is fixed into a foam, which is difficult to burst. A foam layer of varying thickness is formed in the gas phase space of the extraction tank, and sometimes it rises out of the tank, which seriously affects the heat dissipation of the slurry, poor smoke exhaust, and difficult filtration. [0003] At present, when extracting and adding sulfuric ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/222C01B25/234B01D19/02B01D11/04
CPCB01D11/04B01D19/02C01B25/222C01B25/234
Inventor 郝付勇尹万金邓曲
Owner SICHUAN MIANZHU PANLONG MINERALS CO LTD
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