Corrosion-resistant repairing method for perforation of top plate of phosphoric acid reaction tank

Abstract

The invention discloses a corrosion-resistant repairing method for the perforation of a top plate of a phosphoric acid reaction tank. The method comprises the following steps of: 1), drilling holes at defective positions with a depth of over 50 millimeters on feed inlet parts in a centre area and a fifth area of the phosphoric acid reaction tank, mounting anchor bars and a steel plate in sequence and welding the anchor bars and the steel plate together, pouring plaster in the space between the steel plate and the top plate of the phosphoric acid reaction tank through openings on the top plate, filling the plaster on the parts, which have corroding holes with a diameter of over 30 millimeters, of a concrete matrix and spraying sand on the other defective parts to remove concrete dust and a corrosion resistant layer on the surface; 2), carrying out gauging treatment, wherein the concrete on the top part is neutralized so that the pH value of dried concrete is not less than 7; and (3), coating epoxy resin on the concrete, performing leveling with the epoxy resin plaster and Kerapox LN paint after the epoxy resin coated on the concrete is solidified and adhering a pre-cured V slab. The method is applicable to the corrosion-resistant repair of the top plate perforation of the large-scale phosphoric acid reaction tank.

Description

technical field [0001] The invention relates to an anti-corrosion method for the top plate of a phosphoric acid reaction tank, in particular to an anti-corrosion repair method for perforation of the top plate of a phosphoric acid reaction tank. Background technique [0002] In the phosphoric acid production process, the phosphoric acid reaction tank used is also called phosphoric acid extraction tank. The tank body is mostly reinforced concrete structure, and the reaction tank is equipped with a stirring device. Phosphate rock powder reacts with concentrated sulfuric acid in the reaction tank to generate phosphoric acid. The structure diagram of the reaction tank is as follows Figure 4 Shown, wherein, 1 is the feeding port of the fifth zone, 2 is the feeding port of the central zone, and 3 is the top plate of the reaction tank. [0003] At present, the anti-corrosion process of the reaction tank roof of large-scale phosphoric acid plants in China adopts the rubber lining s...

AI Technical Summary

Problems solved by technology

But in the phosphorus and compound fertilizer industry, there is no 360m 2 The above experience in repairing such a large area, and whether it is rubber-lined or FRP anti-corrosion construction has very strict requirements on the surface of the concrete, and the anti-corrosion construction is completed during the construction period.

When many reaction tanks have been put into use for many years and the anti-corrosion engineering fails for repair, due to the unevenness of the entire construction work surface, the construction requirements are very difficult. Therefore, it is urgent to develop a new and effective anti-corrosion method

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