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A composite lining for corrosion protection of dissolution tanks

A composite lining and corrosion protection technology, applied in the direction of layered products, metal layered products, chemical instruments and methods, etc., can solve problems such as single, difficult to ensure stable and continuous production, and achieve the goal of reducing corrosion and reducing the probability of harm Effect

Active Publication Date: 2016-09-07
CHINA SHENHUA ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical research on the anti-corrosion lining of the stripper has a long history. Most of the reports use coating technology to protect the interior of the metal shell of the stripper by a single method of corrosion protection, such as various coatings, metal thermal spray coatings, organic coatings, etc., and achieved However, after long-term operation, due to the wear of the solid phase material in the dissolver after corrosion, the corrosive medium can still penetrate the outer anti-corrosion layer and erode the metal substrate, making it difficult to ensure stable and continuous production

Method used

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  • A composite lining for corrosion protection of dissolution tanks

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Embodiment

[0025] 1) Prepare the metal layer: such as figure 1 As shown, first clean the surface of the steel substrate of the dissolution lining, specifically, first clean the surface of the sample with acetone, and then use 30 mesh brown corundum to pre-treat the sample by sandblasting. After the sandblasting is completed, use clean compressed air Blow off the dust and debris on the surface; after cleaning, use the DPT2303 type arc spraying device to spray the aluminum metal layer 2 on the steel substrate surface of the dissolution lining. The parameters of the spraying are: voltage 30V ~ 32V, current 140A ~ 160A, air pressure 0.16MPa~0.17MPa, the spray gun is perpendicular to the workpiece, the spraying distance is 200mm, and the spraying thickness is 40-60μm.

[0026] 2) Preparation of sealing layer: Use DPT2303 type arc spraying device to spray sealing layer 3 composed of epoxy resin powder and zinc sheet with a mass ratio of 3:1. The spraying parameters are: voltage 20V-22V, curren...

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Abstract

The invention discloses a composite lining for the corrosion prevention of a dissolution tank. The composite lining is characterized by comprising a metal layer, a closed layer and an acid-proof brick layer, wherein the metal layer, the closed layer and the acid-proof brick layer are sequentially combined on a metal substrate of the dissolution tank, the closed layer is formed by epoxy resin powder and a sheet metal material, and the acid-proof brick layer and the closed layer are connected with each other through an inorganic adhesive layer so as to prevent the infiltration of a corrosive medium. According to the invention, the metal layer can achieve an anode protection effect, or utilizes the excellent corrosion prevention properties of various metal alloys; the closed layer achieves an effect of adhering the inorganic adhesive layer to the metal layer, and also can isolate the metal layer; the acid-proof brick layer further has anticorrosive, isolated and abrasion-resistant effects, so that all the layers are entirely coordinated so as to achieve multiple corrosion prevention functions.

Description

technical field [0001] The invention belongs to the technical field of metal surface protection, and in particular relates to a composite lining for corrosion protection of dissolution tanks. Background technique [0002] Extracting alumina from fly ash by acid method is one of the important ways to recover fly ash resources. The stripping device used for dissolving fly ash with hydrochloric acid is steel equipment. Since it has been corroded by hydrochloric acid, it is prone to rust and wear after a long time. And other phenomena, resulting in equipment damage, seriously affecting the production process. However, the high temperature and high pressure resistance of steel structure materials cannot be replaced by other materials such as plastics. Therefore, it is of great significance to study the anticorrosion treatment of steel surfaces without affecting the properties of steel itself. [0003] The technical research on the anti-corrosion lining of the stripper has a long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B15/092B32B9/04
Inventor 凌文赵宇航王启瑞王永旺李世春孙国才苗家兵陈东
Owner CHINA SHENHUA ENERGY CO LTD
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