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Method of repairing phosphoric acid equipment corroded

A technology of reaction equipment and phosphoric acid, applied in chemical instruments and methods, chemical/physical/physical-chemical processes, chemical/physical processes, etc., can solve problems such as shortening service life, prolong service life, avoid safety hazards, and prevent being The effect of corrosion

Inactive Publication Date: 2014-07-16
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a method for repairing phosphoric acid reaction equipment after being corroded, so as to overcome the shortcomings of the phosphoric acid reaction equipment in the prior art because of being corroded and shortening its service life during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for repairing phosphoric acid reaction equipment after being corroded is divided into the following four processing steps:

[0028] 1) Substrate surface treatment: first, clean up the phosphogypsum or other residues on the corroded parts of the phosphoric acid reaction equipment. For the surface of the cement matrix, use a chisel to chisel the hard base body when cleaning, and make the roughness Rz=50um; for the holes with large corrosion on the base surface, use a chisel to expand until the base surface is flat and loose cement grout , flakes that are fragile or easy to peel off, and residual heterogeneous media are all removed by sandblasting and mechanical grinding, and the cement mortar that is not dense around is also removed, and then check the specific parts that are corroded. To determine the scope of repairs that need to be repaired. Then wash with sodium hydroxide, the purpose is to neutralize the residual acid in the matrix, and the degree of neutra...

Embodiment 2

[0033] A method for repairing phosphoric acid reaction equipment after being corroded is divided into the following four processing steps:

[0034] 1) Substrate surface treatment: first, clean up the phosphogypsum or other residues on the corroded parts of the phosphoric acid reaction equipment. For the surface of the cement matrix, use a chisel to chisel the hard base body when cleaning, and make the roughness Rz=60um; for the holes with large corrosion on the base surface, use a chisel to expand the base until the base surface is a pot-bottom-shaped arc transition , loose cement grout, fragile or peeling flakes, and residual heterogeneous media are all removed by sandblasting and mechanical grinding. The specific parts that are corroded to determine the scope of repairs that need to be repaired. Then wash with concentrated ammonia water, the purpose is to neutralize the residual acid in the matrix, and the degree of neutralization is that the pH value of the matrix is ​​7. ...

Embodiment 3

[0039] A method for repairing phosphoric acid reaction equipment after being corroded is divided into the following four processing steps:

[0040] 1) Substrate surface treatment: first, clean up the phosphogypsum or other residues on the corroded parts of the phosphoric acid reaction equipment. For the surface of the cement matrix, use a chisel to chisel the hard base body when cleaning, and make the roughness Rz=100um; use a chisel to expand the holes with a large corrosion on the base surface until the base surface is flat and loose cement grout , flakes that are fragile or easy to peel off, and residual heterogeneous media are all removed by sandblasting and mechanical grinding, and the cement mortar that is not dense around is also removed, and then check the specific parts that are corroded. To determine the scope of repairs that need to be repaired. Then wash with calcium hydroxide, the purpose is to neutralize the residual acid in the matrix, and the degree of neutral...

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Abstract

The invention discloses a method of repairing phosphoric acid equipment corroded and belongs to the technical field of corrosion and protection. The method includes the steps of 1, treating the base surface, namely cleaning the corroded base surface of a phosphoric acid device, cleaning with alkali, and wiping the base surface with detergent; 2, repairing defects, namely painting the base surface with epoxy primer, and repairing with epoxy putty or epoxy mortar; 3, performing conduction leveling, namely, after repairing the defects of a base, painting a conductive layer; 4, performing anti-corrosion isolating, namely, roughening and leveling the conductive layer to impart certain roughness to the conductive layer, cleaning the conductive layer, painting with primer, cement and a glued board, and checking the phosphoric acid device required. The method has the advantages that after the treatment, the corroded phosphoric acid device is repaired and the service life of the phosphoric acid device is prolonged.

Description

technical field [0001] The invention relates to the technical field of corrosion and protection, in particular to a method for repairing corroded phosphoric acid reaction equipment. Background technique [0002] Corrosion science is an emerging marginal subject. During corrosion, a chemical or electrochemical multiphase reaction occurs on the interface of the metal, which turns the metal into an oxidized (ion) state. This will significantly reduce the mechanical properties of metal materials such as strength, plasticity, and toughness, destroy the geometry of metal components, increase wear between parts, deteriorate electrical and optical physical properties, shorten the service life of equipment, and even cause disasters such as fire and explosion. sex accident. According to incomplete statistics from developed countries, the annual direct loss due to corrosion accounts for about 1-4% of the gross national value, and the steel loss due to metal corrosion accounts for abou...

Claims

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Application Information

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IPC IPC(8): B23P6/00
CPCB01J19/00B01J2219/00024
Inventor 陈勇郑全武杨浒
Owner GUIYANG KAILIN FERTILIZER CO LTD
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