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For pickling steel, rust removal, green 矾
It uses some of the steel surface and the use of steel mills electroplating factory units often iron rust, the rust of the steel strip immersed in the waste acid, the spent acid because sulfuric acid process titanium production Erysiphe generated, which is suitable concentration Steel pickling and rust removal. The rust acts on the sulfuric acid in the spent acid, and the rust is dissolved and removed, and a small amount of iron reacts with the sulfuric acid to form ferrous sulfate. Its relevant reaction formula is as follows:
FeO+H 2 SO 4 ===FeSO 4 +H 2 O
Fe 2 O 3 +3H 2 SO 4 ===Fe 2 (SO 4 ) 3 +3H 2 O
Fe 2 +(SO 4 ) 3 +Fe===3FeSO 4
Fe+H 2 SO 4 ===FeSO 4 +H 2 ↑
During the pickling process, the acidity is continuously decreased due to the consumption of sulfuric acid, and the ferrous sulfate is increasing. However, there is still a certain acidity in the solution after pickling, and iron scraps can be added to continue to form more ferrous sulfate. When the generated ferrous sulfate accumulates to a certain extent, it is frozen, crystallized and separated to obtain green enamel crystals.