Method for recovering acid liquor and separating vanadium in process of reducing acid leaching vanadium-containing waste catalyst
A technology for waste catalysts and catalysts, applied in the direction of improving process efficiency, can solve the problems of low leaching rate, only reaching 85%, low product purity, etc., and achieve the effects of mild leaching conditions, low leaching temperature, and high vanadium leaching rate.
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Embodiment 1
[0064] A method for recovering acid solution and separating vanadium in the process of reductive acid leaching waste catalyst containing vanadium comprises the following steps:
[0065] (1) Add the vanadium-tungsten-titanium-aluminum system catalyst to oxalic acid for leaching at 70°C for 6 hours to obtain an organic acid immersion solution with a vanadium element content of 4.5g / L, and evaporate water under reduced pressure at 80°C in the organic acid immersion solution , the evaporation volume is 80% of the volume of the organic acid immersion solution, then crystallize oxalic acid at 0°C for 8 hours, and filter the oxalic acid crystals to obtain the enrichment solution;
[0066] (2) According to the volume ratio of the enriched solution and hydrogen peroxide as 10:1, mix the enriched solution with hydrogen peroxide, oxidize at 70°C, add ammonia water to the oxidized enriched solution to adjust the first pH value to 3, Add 1g of ethylenediaminetetraacetic acid, carry out the...
Embodiment 2
[0068] The difference from Example 1 is that step (2) adjusts the first pH value to 2.
Embodiment 3
[0070] The difference from Example 1 is that step (2) adjusts the first pH value to 4.
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