Which is the best acid washing tower manufacturer

The principle of acid washing (using hydrochloric acid as an example)

Dissolution effect: Hydrochloric acid can dissolve three layers of iron oxide scale.

Mechanical peeling action: Fe+2HCl → FeCl2+H2, generating a large amount of hydrogen gas. Due to the expansion pressure of hydrogen gas, the iron sheet is peeled off from the surface of the steel strip.

Reduction effect: To reduce high valent iron oxide compounds and high valent iron salts to low valent iron oxide compounds and low valent iron salts that are easily soluble in acid solution. The reaction formula is:

Manufacturer of Fe2O3+2 {H}=2 FeO+H2O pickling tower

The advantages of hydrochloric acid pickling; Can completely dissolve three layers of iron oxide scale without the need for mechanical scaling; The corrosion effect on metals is small, and the metal loss is relatively low; After pickling, the surface quality of the strip steel is good and smooth; Waste acid can be recycled and reused, reducing costs and solving pollution.

Factors affecting pickling

The thickness and structure of iron oxide scale

The influence of acid concentration and temperature

The influence of iron salts in acid solution

The influence of acid solution stirring

Pickling defects

Hydrogen embrittlement: hydrogen gas enters the body and is produced.

Overpickling: The strip steel is soaked in acid for too long; The acid concentration temperature is too high.

Underpickling: The opposite of over pickling.

Local underpickling: Local iron oxide skin is too thick; The strip steel is pulled too tightly in the acid tank.

Plan layout of tower pickling unit

Plan layout and process flow of 1700mm horizontal hydrochloric acid pickling workshop

Main equipment composition: feed section equipment, process section equipment, and discharge section equipment.

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