[0023] Take 200mL of fluorine-containing ammonia nitrogen-containing waste water from the production line of an electronics manufacturer (fluorine content 15g / L, ammonia nitrogen content 20g / L), adjust the pH of the solution to 5 with ammonia water, add 0.2% powdered carbon, stir for 2.5h, filter, and send the secondary waste to electrolysis Tank electrolytic regeneration, adding 7.59g of lime to the filtrate for beating, the added amount is calcium fluorine ratio of 1.3:2, after stirring for 2 hours, after press filtration, the filter cake is washed by a filter press to obtain 6.18g of calcium fluoride product, and the filtrate is passed through sulfuric acid After adjusting the pH to 6, evaporate the concentrate to a specific gravity of 1.33g / mL at a temperature of 100°C and a vacuum of 0.06MPa, cool to 25°C, and centrifuge to obtain 14.18g of ammonium sulfate crystals. The washing liquid of the filter press is used in the beating process . The powdered carbon in this exampl...

Olympusmicroscope

[0021] Take 200mL of fluorine-containing ammonia nitrogen-containing waste water from the production line of an electronics manufacturer (fluorine content 16g / L, ammonia nitrogen content 22g / L), adjust the pH of the solution to 3 with sulfuric acid, add 0.1% powdered carbon, stir for 1.5h, filter, and send the secondary waste to electrolysis The tank is electrolytically regenerated, and the filtrate is beaten with 12.6g of calcium sulfate, and the amount of calcium to fluorine ratio is 1.1:2. After stirring for 1 hour, after press filtration, the filter cake is washed by a filter press to obtain 6.61g of calcium fluoride product, and the filtrate is passed through After adjusting the pH to 5 with ammonia water, evaporate at a temperature of 90°C and a vacuum of 0.04MPa until the specific gravity of the concentrated solution is 1.32g / mL, cool to 20°C, and centrifuge to obtain 16.12g of ammonium sulfate crystals. The filter press washing liquid is used for beating link. The powd...

OlympusCX23

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OlympusSZ61

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BX43olympus

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[0025] Take 200mL of fluorine-containing ammonia nitrogen-containing waste water (fluorine content 18g / L, ammonia nitrogen content 25g / L) from the production line of an electronics manufacturer, measure the pH of the stock solution=8, add 0.4% hydrogen peroxide, and stir it in a water bath at a temperature of 70°C for 1.5h. Add 10.52g of lime to make a slurry. The amount of calcium to fluorine ratio is 1.5:2. After stirring for 3 hours, press filter, and the filter cake is washed by a filter press to obtain 7.44g of calcium fluoride product. The filtrate is adjusted to pH = 7 by ammonium carbonate. Finally, at a temperature of 110°C and a vacuum of 0.08MPa, evaporate until the specific gravity of the concentrated solution is 1.34g / mL, cool to 30°C, and centrifuge to obtain 18.39g of ammonium sulfate crystals. The filter press washing liquid is used for beating.

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