Method for recycling molybdenum of molybdenum-contained waste catalyst
A waste catalyst and ammonium molybdate technology, applied in the direction of improving process efficiency, etc., can solve the problems of low molybdenum recovery rate, high treatment cost, complicated process, etc., and achieve the effect of low raw material price, simple equipment and simple process
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[0026] Example 1
[0027] 100g of FDS-4 spent hydrogenation catalyst (FDS-4 is a distillate hydrodesulfurization catalyst developed and produced by Fushun Petrochemical Research Institute) was roasted at 400°C for 3 hours, and then pulverized to 120 mesh after cooling. 81.6 g was obtained, and the content of molybdenum and cobalt (based on oxide weight) was analyzed to be 15.4% and 4.8%, respectively. Mixed with alkaline substances, the weight ratio of sodium carbonate to spent catalyst is 1:1 (about 81 g in weight), and the weight ratio of sodium bicarbonate to spent catalyst is 0.5:1 (about 41 g in weight). The mixed powder was pulverized and calcined at 700°C for 8 hours, and the weight of the powder after cooling was 216.9 g. The volume of the mixed acid solution is 2169 mL, in which the concentration of sulfuric acid is 10%, the concentration of nitric acid is 2%, and the concentration of citric acid is 1%. Heat the mixed acid solution to 80°C, add the roasted mixed powder...
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[0028] Example 2
[0029] 100g of FDS-4 spent hydrogenation catalyst was calcined at 450°C for 3 hours, and then pulverized to 120 mesh after cooling. 79.6 g was obtained, and the content of molybdenum and cobalt (based on oxide weight) was analyzed to be 16.1% and 5.3%, respectively. Mixed with alkaline substances, the weight ratio of sodium carbonate to spent catalyst is 2:1 (about 160 g in weight), and the weight ratio of sodium bicarbonate to spent catalyst is 0.1:1 (about 8 g in weight). The mixed powder was pulverized and calcined at 750°C for 7 hours, and the weight of the powder after cooling was 205.6 g. The volume of the mixed acid solution is 1028 mL, in which the concentration of sulfuric acid is 30%, the concentration of nitric acid is 3%, and the concentration of citric acid is 3%. Heat the acid solution to 95°C, add the calcined powder, and stir and immerse for 1.5h. After cooling, add ammonia water to adjust the pH value to 1.5 first to precipitate ammonium mol...
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