A method for the treatment of hot-dip galvanizing pickling wastewater and the preparation of carbon-supported iron-zinc binary metal composites
A technology of pickling wastewater and binary metals, which is applied in the fields of chemical engineering and environmental engineering, can solve the problems of low ammonia nitrogen adsorption capacity and poor ammonia nitrogen effect, and achieve the effects of recycling, reducing treatment costs and large power consumption
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Embodiment 1
[0042] S1: To 1000mLpH=1-2 iron and steel pickling wastewater (wherein Fe 2+ The mass percentage is about 0.7%, Zn 2+ Add 20g furfural slag in the mass percentage composition is about 0.1%);
[0043] S2: Stir the solid-liquid mixture obtained in step S1 at 50° C. for 0.5 h;
[0044] S3: Filtrate the solid-liquid mixture obtained in step S2 to obtain 25g wet filter cake, Fe in the filtrate 2+ and Zn 2+ The mass percentages are all less than 0.08%;
[0045] S4: Put the filter cake obtained in step S3 into a high-temperature furnace, evacuate until the pressure in the furnace is constant, slowly raise the temperature to 500° C., and keep the temperature under vacuum for 15 hours. Then, the temperature was lowered to room temperature to obtain 8.5 g of a black solid.
[0046] S5: Add 5 g of the solid obtained in step S4 to 500 mL of ammonium sulfate aqueous solution (0.2 g / L), stir at room temperature for 0.5 h, filter, and the concentration of ammonium sulfate in the filtrat...
Embodiment 2
[0050] S1: To 1000mLpH=1-2 iron and steel pickling wastewater (wherein Fe 2+ The mass percentage is about 0.3%, Zn 2+ Add 30g furfural slag in the mass percent composition is about 0.1%);
[0051] S2: Stir the solid-liquid mixture obtained in step S1 at 35° C. for 3.5 h;
[0052] S3: Filtrate the solid-liquid mixture obtained in step S2 to obtain 36g wet filter cake, Fe in the filtrate 2+ The mass percentage is 0.07%, Zn 2+ The mass percentage content is 0.04%;
[0053] S4: Put the filter cake obtained in step S3 into a high-temperature furnace, evacuate until the pressure in the furnace is constant, slowly raise the temperature to 700° C., and keep warm for 8 hours under vacuum. Then, the temperature was lowered to room temperature to obtain 13.1 g of a black solid.
[0054] S5: Add 5 g of the solid obtained in step S4 to 500 mL of ammonium sulfate aqueous solution (0.2 g / L), stir at room temperature for 0.5 h, filter, and the concentration of ammonium sulfate in the fil...
Embodiment 3
[0058] S1: To 1000mLpH=1-2 iron and steel pickling wastewater (wherein Fe 2+ The mass percentage is about 0.3%, Zn 2+ Add 50g furfural slag in the mass percent composition is about 0.3%);
[0059] S2: Stir the solid-liquid mixture obtained in step S1 at 50° C. for 8 h;
[0060] S3: Filter the solid-liquid mixture obtained in step S2 to obtain a 55g wet filter cake, and Fe in the filtrate 2+ The mass percentage is 0.05%, Zn 2+ The mass percentage content is 0.03%;
[0061] S4: Put the filter cake obtained in step S3 into a high-temperature furnace, evacuate until the pressure in the furnace is constant, slowly raise the temperature to 900° C., and keep warm for 4 hours under vacuum. Then, the temperature was lowered to room temperature to obtain 17.5 g of a black solid.
[0062] S5: Add 5 g of the solid obtained in step S4 to 500 mL of ammonium sulfate aqueous solution (0.2 g / L), stir at room temperature for 0.5 h, filter, and the concentration of ammonium sulfate in the f...
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