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Anti-corrosion construction method of low-order flash chamber of phosphoric acid flash cooling system

A construction method and flash chamber technology, applied in flash evaporation, chemical instruments and methods, chemical/physical/physicochemical processes, etc., can solve problems such as short maintenance period, unstable anti-corrosion layer, easy to be corroded and perforated, etc. Achieve the effect of reducing equipment and equipment operating costs, increasing mechanical strength and corrosion resistance, extending service life and maintenance cycle

Inactive Publication Date: 2018-09-14
GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphoric acid production flash cooling system The low-level flash chamber is an essential step in the reaction system of the wet-process phosphoric acid production, and the substances entering the low-level flash chamber contain highly corrosive dilute phosphoric acid, dilute sulfuric acid, hydrofluoric acid, etc., common materials It cannot meet the anti-corrosion requirements of the equipment. In the production process, it is also a high-temperature and negative-pressure equipment. When the axial flow pump transports the slurry to the low-level flash chamber, it has a little vibration and strong scouring force, which will cause The baffle wall often has problems such as collapse and falling off
[0004] At present, 4mm ordinary pre-vulcanized rubber sheet lining is used as the anti-leakage layer on the market, and 3cm thick carbon plate is used as the wear-resistant and protective layer. However, this scheme does not fully consider high temperature, negative pressure, strong corrosion, Due to factors such as liquid, vibration, and scouring, when the vacuum occurs, the pre-vulcanized rubber sheet will be absorbed and fallen off, and the 3cm thick carbon plate will also appear to vibrate and fall off, the baffle plate collapses, and the liquid return hole leaks, etc., so that the equipment in the prior art has the following problems:
[0005] 1. The service life of the equipment is short and the maintenance cycle is short;
[0006] 2. It is easy to be corroded and perforated, and there are safety and environmental risks;
[0007] 3. The instability of the anti-corrosion layer directly affects the operating rate and production

Method used

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Examples

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Embodiment 1

[0044] An anti-corrosion construction method for a low-level flash chamber of a phosphoric acid flash cooling system, including rubber lining and brick lining, specifically comprising the following steps:

[0045] 1. Rubber lining:

[0046] (1) Carry out sandblasting treatment to the inner wall, bottom and baffle plate of the low-level flash evaporation; the roughness of the inner wall, bottom and baffle plate of the low-level flash evaporation after the sandblasting treatment is 60 μm;

[0047] (2) Use cleaning agent to scrub the inner wall, bottom and baffle of the low-level flash chamber, and apply primer and adhesive;

[0048] (3) Lining unvulcanized rubber, pressurized steam vulcanization; the vulcanization process is constant temperature treatment at 0.3Mpa, 125°C for 6h; the thickness of the lining unvulcanized rubber is 4mm, and the unvulcanized rubber is HF-D ;

[0049] The rubber lining is D3 rubber lining;

[0050] 2. Lining bricks: including lining bricks for th...

Embodiment 2

[0061] An anti-corrosion construction method for a low-level flash chamber of a phosphoric acid flash cooling system, including rubber lining and brick lining, specifically comprising the following steps:

[0062] 1. Rubber lining:

[0063] (1) Carry out sandblasting treatment to the inner wall, bottom and baffle plate of the low-level flash evaporation; the roughness of the inner wall, bottom and baffle plate of the low-level flash evaporation after the sandblasting treatment is 62 μm;

[0064] (2) Use cleaning agent to scrub the inner wall, bottom and baffle of the low-level flash chamber, and apply primer and adhesive;

[0065] (3) Lining unvulcanized rubber, pressurized steam vulcanization; the vulcanization process is constant temperature treatment at 0.6Mpa, 150°C for 10h; the thickness of the lining unvulcanized rubber is 4mm, and the unvulcanized rubber is HF-D ;

[0066] The rubber lining is D3 rubber lining;

[0067] 2. Lining bricks: including lining bricks for t...

Embodiment 3

[0078] An anti-corrosion construction method for a low-level flash chamber of a phosphoric acid flash cooling system, including rubber lining and brick lining, specifically comprising the following steps:

[0079] 1. Rubber lining:

[0080] (1) Carry out sandblasting treatment to the inner wall, bottom and baffle plate of the low-level flash evaporation; the roughness of the inner wall, bottom and baffle plate of the low-level flash evaporation after the sandblasting treatment is 80 μm;

[0081] (2) Use cleaning agent to scrub the inner wall, bottom and baffle of the low-level flash chamber, and apply primer and adhesive;

[0082] (3) Lining unvulcanized rubber, pressurized steam vulcanization; the vulcanization process is constant temperature treatment at 0.4Mpa, 130°C for 7h; the thickness of the lining unvulcanized rubber is 4mm, and the unvulcanized rubber is HF-D ;

[0083] The rubber lining is D3 rubber lining;

[0084] 2. Lining bricks: including lining bricks for th...

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Abstract

The invention discloses an anti-corrosion construction method of a low-order flash chamber of a phosphoric acid flash cooling system. The anti-corrosion construction method comprises rubber lining andbrick lining, wherein the rubber lining is D3 slab rubber lining; the brick lining is carried out on the bottom part, the inner wall, a baffle plate, a baffle plate flow guiding pipe, a connector pipe and a liquid return hole of the low-order flash chamber. According to the anti-corrosion construction method disclosed by the invention, vulcanizing of D3 slab rubber body and brick lining are adopted, so that the mechanical strength and the corrosion resistance of the low-order flash chamber are increased, the low-order flash chamber has wide adaptability to field use environment, has the functions of preventing leakage and resisting corrosive media such as sulfuric acid, hydrofluoric acid and dilute phosphoric acid, is high temperature-resistant and negative pressure-resistant, can be safely used under a negative pressure environment of 50kp and is safe, environmentally friendly, acid and alkali-resistant and anti-corrosion, the service life and the overhaul period of equipment are prolonged, and the problems that the prior art is in urgent need of preventing corrosion, baffle plate collapse, liquid return hole leakage and the like can be solved.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid production, and in particular relates to an anti-corrosion construction method for a low-level flash chamber of a phosphoric acid flash cooling system. Background technique [0002] The phosphoric acid obtained by decomposing phosphate rock with sulfuric acid, nitric acid or hydrochloric acid is collectively called wet-process phosphoric acid, and the method of decomposing phosphoric acid with sulfuric acid is the most basic method in the production of wet-process phosphoric acid. Wet-process phosphoric acid is an important raw material for the production of phosphate fertilizers, mainly used in the production of phosphate compound fertilizer products. Wet-process phosphoric acid can also be further processed to produce various phosphate products, or to produce food-grade phosphoric acid. [0003] During the operation of chemical production equipment, the medium is often accom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/32B01D3/06B01J19/02
CPCB01D3/06B01D3/32B01J19/02
Inventor 龚旭余永浩晏大波田勇
Owner GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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