Paint waste gas treatment
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Industry Introduction

Spraying refers to covering the surface of metal and non-metal with a protective layer or a decorative layer, and is the basic technical means used for product surface protection and decoration. The coating process can be simply summarized as: pre-treatment → spraying → drying or curing. Pre-treatment generally includes degreasing, rust removal, and passivation (phosphating) processes. According to different coatings and anti-corrosion requirements, treatment methods such as oil removal, rust removal, and phosphating should be selected according to the condition of the raw material of the workpiece. In the pre-treatment and rust removal process, sandblasting, shot blasting or polishing processes are also used in different departments of different industries as needed.

 

Industry characteristics
According to the paint spraying production process, paint spraying waste gas mainly comes from the pre-treatment, spraying, and drying processes. The pollutants emitted are mainly: dust or paint mist generated during the pre-treatment process, paint mist and organic solvents generated during painting. Organic solvents generated during drying and volatilization. The paint mist mainly comes from the scattered parts of the solvent-based paint in the air spraying operation, and its composition is consistent with the paint used. Organic solvents mainly come from solvents and thinners in the coating process, and most of them are volatile emissions. The main pollutants are xylene, benzene, toluene and VOCs. The harmful exhaust gas emitted from painting is mainly concentrated in the spray paint production line, among which the spray booth, drying room, and drying room are the main sources of exhaust gas.

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