Regenerating spent pickling liquor

Details Regenerating spent pickling liquor Regenerating spent pickling liquor

C - Chemistry, Metallurgy

23

G

C23G 1/36 (2006.01) C01B 7/03 (2006.01) C01B 7/07 (2006.01) C01G 49/14 (2006.01) C23G 1/08 (2006.01)

Patent

CA 2396452

Apparatus and method for regenerating spent pickling liquor from the acid pickling of a metal are disclosed. Acid pickling of a metal uses a first acid and forms a spent pickling liquor (SPL). A second acid added to the spent pickling liquor, under specificlow temperatures produces a metal salt of the second acid. The me salt of the second acid is crystallized and removed from a regen first acid. In one aspect, hydrochloric acid is regenerated fropickling process for iron or steel, using sulfuric acid as the seacid, and ferrous sulfate heptahydrate crystals are produced. Regenerated hydrochloric acid is recycled to the acid pickling process.

L'invention concerne un appareil et un procédé de régénération de liqueur de décapage usée provenant du décapage à l'acide d'un métal. Le décapage à l'acide d'un métal utilise un premier acide et constitue une liqueur de décapage usée (SPL). Un second acide, ajouté à la liqueur de décapage usée à des températures basses spécifiques, produit un sel métallique du second acide. Ce sel métallique du second acide est cristallisé et éliminé d'un premier acide régénéré. Dans un aspect, l'acide chlorhydrique est régénéré à partir d'un processus de décapage pour l'acier ou le fer, au moyen d'acide sulfurique comme le second acide et des cristaux d'héptahydrate de sulfate ferreux sont produits. L'acide chlorhydrique régénéré est recyclé au processus de décapage à l'acide.

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