A process for the recovery of adsorbed palladium from spent silica
A technology of palladium salt and silica gel, applied in the field of precious metal recovery, can solve problems such as destroying the carrier structure
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Embodiment 1
[0072] Take 500 g of spent silica in a porcelain dish, where palladium exists as a mixture of palladium phthalocyanine complexes adsorbed on silica gel, and keep it in an air atmosphere in a muffle furnace at 400°C for 3 hours, then cool it to room temperature. Get 1000 milliliters of 2 mol / liter hydrochloric acid aqueous solution in 5 liters of round-bottomed flasks that heating mantle and thermocouple are equipped with, the material in the round-bottomed flasks is heated at constant temperature. The silicon oxide treated above was added, and all the materials in the round bottom flask were kept at a constant temperature. The above treated silica was added and the whole was refluxed at 90°C for 5 hours. After cooling to room temperature, it was filtered using a Buchner funnel, followed by washing with 0.5 mol / l aqueous hydrochloric acid and drying in an oven at 100°C. The pH of the palladium-containing filtrate is raised to 6 and the resulting sediment is filtered in order ...
Embodiment 2
[0075] Take 500 g of spent silica in a porcelain dish, and keep it in an air atmosphere in a muffle furnace at 700°C for 3 hours, and then cool it down to room temperature. Get 1000 milliliters of 2 mol / liter hydrochloric acid aqueous solution in 5 liters of round-bottomed flasks that heating mantle and thermocouple are equipped with, the material in the round-bottomed flasks is heated at constant temperature. The above treated silica was added and the whole was refluxed at 90°C for 5 hours. After cooling to room temperature, it was filtered with a Buchner funnel and washed with 0.5 mol / L hydrochloric acid. The silicon oxide was then dried in an oven at 100°C. The pH of the palladium-containing filtrate is raised to 6 and the resulting sediment is filtered in order to remove impurities, especially silicon oxides, iron and other metals. The sediment was collected and dried. The pH of the filtrate obtained at pH 6 was raised to 9.3, and the sediment was collected and dried. ...
Embodiment 3
[0078] The above experiment was repeated except that the silicon oxide was fired at 300°C. Palladium could not be recovered from the sediment obtained after adjusting the pH of the filtrate obtained after acid digestion to different values of 6, 9 and 11.
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