Method for recycling acid and metal elements in acid pickling waste liquor on metal surface
A technology of pickling waste liquid and recovery method, which is applied in the direction of improving process efficiency, etc., can solve problems such as difficulty in implementation, reduction of free acid concentration, and hazardous sludge waste, so as to eliminate the discharge of waste residue and waste liquid and reduce acid recovery Cost, effect of low metal ion content
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Embodiment 1
[0044] The composition in the pickling waste liquid in the present embodiment is:
[0045] Fe(III) 5.0g / L, Fe(II) 66.0g / L, Ni 0.5g / L, Cr 3.0g / L, H 2 SO 4 1.0mol / L;
[0046] Wherein, due to the presence of Fe(III) in this embodiment, 2g, 100 mesh reduced iron powder was added before the precipitation to reduce it to Fe(II);
[0047] The recovery method provided by the present embodiment comprises the following steps:
[0048] (1) Add 78.1 g of solid oxalic acid dihydrate to 500 mL of pickling waste liquid for precipitation and stir for 20 minutes. After precipitation, solid-liquid separation is performed to obtain metal precipitates and regenerated acid; wherein, the metal precipitates are oxalic acid Ferrous yellow precipitate, used in blast furnaces or in the production of high value-added metal products;
[0049] (2) Part of the regenerated acid obtained in step (1) is permeated with a diffusion membrane to obtain an acid-rich solution and a solution rich in metal ions,...
Embodiment 2
[0054] The composition in the pickling waste liquid in the present embodiment is:
[0055] Fe(II) 80.0g / L, Mn 2.0g / L, Cr 13.0g / L, H 2 SO 4 2.0mol / L;
[0056] The recovery method provided by the present embodiment comprises the following steps:
[0057] (1) Add 146g of solid succinic acid to 500mL of pickling waste liquid to carry out precipitation operation and stir for 1h. After precipitation, through solid-liquid separation, metal precipitate and regenerated acid are obtained; wherein, the metal precipitate is succinic acid Iron white precipitate, used in blast furnaces or in the production of high value-added metal products;
[0058] (2) Part of the regenerated acid obtained in step (1) is permeated with a diffusion membrane to obtain an acid-rich solution and a solution rich in metal ions, and then the acid-rich solution and the remaining regenerated acid are mixed for the metal pickling process; wherein, the step (2) the volume of the part of the regenerated acid is ...
Embodiment 3
[0063] The composition in the pickling waste liquid in the present embodiment is:
[0064] Fe(II) 50.0g / L, Mn 5.0g / L, Cu10.0g / L, HCl 4.0mol / L;
[0065] The recovery method provided by the present embodiment comprises the following steps:
[0066] (1) Add 146g of solid oxalic acid dihydrate to 500mL of pickling waste liquid to carry out precipitation operation and stir for 30min, after precipitation, through solid-liquid separation, metal precipitate and regenerated acid are obtained; wherein, the metal precipitate is oxalic acid sulfide Iron yellow precipitate, which can be used in blast furnaces or to prepare high value-added metal products;
[0067] (2) Part of the regenerated acid obtained in step (1) is permeated with a diffusion membrane to obtain an acid-rich solution and a solution rich in metal ions, and then the acid-rich solution and the remaining regenerated acid are mixed for the metal pickling process; wherein, the step (2) the volume of the part of the regenera...
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