Method for separating and recovering V and Cr from V-Cr waste material
A waste material, vanadium chromium technology, applied in the field of chromium and vanadium recovery, separation of vanadium and chromium, can solve the problems of vanadium and chromium separation and recovery without practical significance, incomplete separation, complicated operation, etc., to facilitate the promotion and implementation of industrialization and facilitate the process The effect of simplification of operation and process
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[0041] Example 1
[0042] Weigh 50g vanadium-chromium waste (containing V 2 O 5 5.41%, including Cr 2 O 3 5.78%), add water at a solid-to-liquid ratio of 1:5, stir with a magnetic stirrer, add a total of 14 mL of sulfuric acid while stirring, the pH value of the feed liquid is close to 1.5, continue stirring for 1 hour and filter with a vacuum pump; : 5 add water and stir for 1 hour, filter with a vacuum pump, combine the filtrate, the filtrate volume is 454mL (wherein: V 2 O 5 Concentration 4.81g / L, Cr 2 O 3 Concentration 5.65g / L), adjusted to pH 2.5 with liquid caustic soda. The filter cake is subjected to two-stage pickling, and water is added according to the ratio of raw material solid to liquid 1:5. After adding sulfuric acid solution while stirring, the pH value of the solution is stabilized at 0.5, and then stirring is continued for 1 hour. The filter cake was washed with water at a solid-to-liquid ratio of 1:4, stirred and washed for 1 hour, filtered with a ...
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[0043] Example 2
[0044] Weigh 50 grams of vanadium-chromium waste (containing V 2 O 5 5.41%, including Cr 2 O 3 5.78%), according to the solid-to-liquid ratio of 1:5, add the second-stage acid leaching solution of Example 1 and add clean water. Add sulfuric acid while stirring until the pH value of the solution is stable at 1.5, continue stirring for 1 hour, filter with a vacuum pump, add the washing liquid of the second-stage acid leaching of Example 1 to the filter cake, and add clean water to a solid-liquid ratio of 1:5, stir for 1 After 1 hour, vacuum pump suction filtration, the filter cake is subjected to two-stage acid leaching, and water is added according to the solid-liquid ratio of 1:5, and sulfuric acid is added to the pH value of 0.5 while stirring, and the vacuum pump suction filtration is continued after stirring for 1 hour. 1:4 Add water, stir and wash for 1 hour, and then use a vacuum pump to filter; filter cake drying detection: vanadium (V 2 O 5 t...
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[0046] Example 3
[0047] a), take by weighing 1.2 tons of vanadium-chromium waste, after testing this material contains vanadium (V 2 O 5 total) 5.52%, chromium (Cr 2 O 3 total) 5.65%, put into the reactor.
[0048] b) After adding water at a solid-liquid ratio of 1:5, add H while stirring 2 SO 4 Until the pH value of the solution is stabilized at 1.5, continue stirring for 1 hour, filter with a plate-and-frame filter press, and store the filtrate in a pool.
[0049] c), b) the filter cake obtained from the steps is returned to the reactor respectively, and the solid-to-liquid ratio of 1.2 tons of vanadium-chromium waste is added and stirred for 1 hour for 1 hour, filtered with a plate and frame filter press, and the filtrate is stored, and the filter cake is still Return to the reactor.
[0050] d), add water to the filter cake obtained in step c) according to the raw material weight-solid-to-liquid ratio of 1:5, add sulfuric acid while stirring to make the soluti...
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