Method for separating and recovering vanadium and chromium from vanadium-chromium slag
A technology for separation and recovery of vanadium chromium slag, applied in the direction of improving process efficiency, etc., can solve the problems of few steps, many steps, and difficult separation, and achieve the effect of fewer steps, conducive to industrial production, and simple operation
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Embodiment 1
[0047] This embodiment is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium slag of the present invention.
[0048] With 100g vanadium-chromium slag (the content of vanadium element is 5.95% by weight, the content of chromium element is 6.05% by weight) and 15.9g sodium carbonate roasting 90min at 750 ℃; The solid ratio is 2:1) and then filtered, and the resulting filtrate is subjected to ammonium salt vanadium precipitation to obtain vanadium precipitation wastewater and a vanadium-containing precipitate with a pH of 2, and the vanadium-containing precipitate is calcined to obtain 8.5g of vanadium pentoxide product; After filter residue (110.3g, the content of water is 5% by weight), 8g sodium oxide and 9.6g sodium hydroxide calcined 2h together at 820 ℃, the product after roasting is carried out water immersion 30min (liquid-solid ratio) at 60 ℃ It is 1.8:1) and then filtered, and the obtained filtrate is poured into the...
Embodiment 2
[0050] This embodiment is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium slag of the present invention.
[0051] 100g of vanadium chromium slag (the content of vanadium element is 3% by weight, the content of chromium element is 9.8% by weight) and 30.87g sodium bicarbonate were roasted at 780°C for 60min; the product after roasting was immersed in water for 60min at 25°C ( The liquid-solid ratio is 3:1) and then filtered, and the obtained filtrate is hydrolyzed to precipitate vanadium to obtain vanadium-precipitated wastewater and a vanadium-containing precipitate with a pH of 3, and the vanadium-containing precipitate is calcined to obtain 4.82g of vanadium pentoxide product; The final filter residue (117.8g, water content is 8% by weight) and 70g sodium carbonate were calcined at 920°C for 2h together, and the product after roasting was immersed in water for 15min at 25°C (liquid-solid ratio was 1.5:1) and then Filtr...
Embodiment 3
[0053] This embodiment is used to illustrate the method for separating and recovering vanadium and chromium from vanadium-chromium slag of the present invention.
[0054] 100g of vanadium-chromium slag (the content of vanadium element is 9.4% by weight, and the content of chromium element is 1.7% by weight) and 24.43g of sodium carbonate are roasted at 550°C for 180min; the product after roasting is immersed in water for 40min at 100°C ( The liquid-solid ratio is 1.2:1) and then filtered, and the obtained filtrate is subjected to ammonium salt vanadium precipitation to obtain vanadium precipitation waste water and vanadium-containing precipitation with a pH of 3.5, and the vanadium-containing precipitation is calcined to obtain 12.416g of vanadium pentoxide product; the above filtration After filter residue (110.4g, the content of water is 5% by weight), 3.27g sodium hydroxide and 8.48g sodium carbonate calcined 4h together at 950 ℃, the product after roasting is carried out wa...
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