A kind of method for refining and extracting platinum
A platinum ammonium salt and precision filtration technology, applied in the field of metal separation and purification, can solve the problems of large exhaust gas emission, large labor, complex process, etc., and achieve the effect of less exhaust gas emission, short operation process and simple process flow
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Embodiment 1
[0018] Platinum group metal feed liquid produced from mineral resources, after NH 4 The crude platinum ammonium salt produced by Cl sinking platinum, after drying and weighing, has a mass of 15.882kg and a platinum content of 41.37%. Add 158.82 L of NaOH solution with a mass fraction of 10% to the crude platinum ammonium salt, dissolve at 50°C for 1 hour, finely filter the solution to remove a small amount of insoluble matter, and the filtrate is set aside. Among them, the funnels, filter bottles or filter tanks, liquid pumps and other instruments used in precision filtration are rinsed with 5% NaOH solution before use until the surface is alkaline to prevent the loss of platinum precipitation caused by acidification. Add hydrochloric acid to the filtrate to adjust the pH value to 0.5, then heat it to 90°C, and add NaClO with a mass fraction of 40% at a rate of 7L / h under stirring. 3 Solution 53.99L, NaClO with a mass fraction of 40% 3 After adding the solution, react at a c...
Embodiment 2
[0022] The platinum group metal material liquid produced after enrichment with the exhausted automobile exhaust catalyst is treated with NH 4 The crude platinum ammonium salt produced by Cl precipitation platinum, after drying and weighing, its quality is 20.653kg, and the platinum content is 42.39%. Add 185.88 L of NaOH solution with a mass ratio of 15% to the crude platinum ammonium salt, dissolve at 55°C for 1.5 hours, finely filter the solution to remove a small amount of insoluble matter, and the filtrate is set aside. Among them, the funnels, filter bottles or filter tanks, liquid pumps and other instruments used in precision filtration are rinsed with 5% NaOH solution before use until the surface is alkaline to prevent the loss of platinum precipitation caused by acidification. Add hydrochloric acid to the filtrate to adjust the pH value to 1, then heat it to 95°C, add 40% NaClO at a rate of 10L / h under stirring 3 Solution 78.48L, NaClO with a mass fraction of 40% 3 A...
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