Method for preparing vanadium oxide
A technology of vanadium oxide and vanadium slag, applied in the field of preparation of vanadium oxide, can solve the problems of increased control difficulty, difficult handling, inconvenient stacking, etc., and achieve the effect of reducing production cost and reducing reagent consumption
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[0011] The method for preparing vanadium oxide according to the present invention comprises the following steps carried out in sequence: vanadium slag is mixed with calcium oxide or limestone to form a mixed material, so that the CaO / V in the mixed material 2 o 5 The weight ratio is 0.25 to 0.65, which can control the vanadium in the calcified roasting clinker, with calcium metavanadate as the main form, because the solubility of calcium metavanadate in water is larger than that of calcium pyrovanadate and calcium orthovanadate, which is conducive to leaching ; Roast the mixed material to obtain calcified clinker; use C at 80-95°C 2 o 4 2- The oxalate solution with a concentration of 35-70g / L is used to leach the calcified clinker; after the leaching reaction is completed, the solid-liquid separation is carried out to obtain the vanadium-containing leaching solution and residue; the vanadium-containing leaching solution is desiliconized so that the Silicon concentration 4 ...
example 1
[0032] Ordinary vanadium slag (containing V 2 o 5 17.2%, CaO1.84%, P0.04%) 100g mixed with calcium oxide 5g evenly, the mixture CaO / V 2 o 5 0.4; the mixture is roasted in a muffle furnace for 180 minutes at a roasting temperature of 850°C and air ventilated; the roasted clinker is crushed to a particle size of no more than 0.1mm and then added to 400mL of sodium oxalate 35g / L+ammonium oxalate 40g / L In the oxalate solution, stirring and leaching at a slurry temperature of 90°C for 120 minutes; after the leaching reaction, solid-liquid separation to obtain a vanadium-containing leaching solution and residue, the residue TV is 0.95wt%, and the vanadium transfer leaching rate is 89.8%; Add 0.8g of sodium aluminate, stir for 20min and then filter to obtain the filtrate; add 10g of ammonium oxalate to the filtrate and stir for 1h, cool to room temperature and let stand for 12h before filtering to obtain ammonium metavanadate and vanadium precipitation wastewater, vanadium precipit...
example 2
[0035] Ordinary vanadium slag (containing V 2 o 5 17.2%, CaO1.84%, P0.04%) 100g mixed with calcium oxide 3g evenly, the mixture CaO / V 2 o 5 0.28; the mixture is roasted in a muffle furnace for 60 minutes at a roasting temperature of 900°C and air ventilated; the roasted clinker is crushed to a particle size of no more than 0.1mm and then added to 600mL of sodium oxalate 30g / L+ammonium oxalate 25g / L In the oxalate solution, stirring and leaching at a slurry temperature of 95°C for 120 minutes; after the leaching reaction, solid-liquid separation to obtain a vanadium-containing leaching solution and residue, the residue TV 1.01wt%, vanadium transfer leaching rate 89.5%; into the leaching solution Add 0.8g of sodium aluminate, stir for 20min and then filter to obtain the filtrate; add 18g of ammonium oxalate to the filtrate and stir for 1h, cool to room temperature and let stand for 12h before filtering to obtain ammonium metavanadate and vanadium precipitation wastewater, vana...
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