Platinum Recovery from Laboratory Chemical Waste (Pt 2)

In this video we recover platinum from platinum containing laboratory chemical waste.

This method was heavily drawn from the method at this citation: G.B. Kauffman, L.A. Teter, Inorg. Synth. 7 (1963) 232–236

Now laboratory chemical waste needs to be incinerated first to remove all organic compounds. Chemical methods are not used because they are more expensive and cannot deal with all types of organic residues. Incineration is the cheapest broadly applicable solution. We've already done this in part 1 of this series: https://www.youtube.com/watch?v=xeKZdJ1As7I

Now in this video we process the platinum concentrate powder into platinum metal. We're using 2.4g of platinum concentrate but your numbers may be adjusted accordingly

First we boil the powder with some concentrated hydrochloric acid. About 10-25ml of acid per gram of platinum concentrate. The mixture is then filtered and the residue is subjected to aqua regia digestion. About 4mL of aqua regia (3ml hcl and 1 mL nitric acid) for every gram of platinum concentrate. The mixture is gently heated to drive the reaction. After all the nitrogen oxides have been driven off the mixture is filtered and is again subjected to aqua regia treatment. This is repeated until the filtrate is a constant shade of light yellow or until stannous chloride testing shows no metals dissolving. The residue is then weighed to determine how much metal was dissolved.

The filtrate is distilled to below 10mL and an equal amount of hydrochloric is acid and distilled again. This is repeated until the distillate is clear. This is done to destroy any remaining nitric acid.

The residue solution is then mixed with sodium chloride equal to the amount of metal dissolved. In this case 0.6g. The solution is then gently boiled until dry.

10mL of water is then added and 1g sodium bicarbonate is added per 0.5g of dissolved metal. The solution is again gently heated until boiling and filtered. This process precipitates base metals as their carbonates and hydroxides.

The filtrate is then precipitated with ammonium chloride solution and filtered. The reside of ammonium hexachloroplatinate is washed with 1% ammonium chloride solution and dried.

The ammonium hexachloroplatinate is then incinerated to recover platinum metal.
Related videos:
Part 1 of platinum recovery from laboratory chemical waste: https://www.youtube.com/watch?v=xeKZdJ1As7I

Make chloroplatinic acid: https://www.youtube.com/watch?v=MlMj3VEYBMA

Chemical resistance of platinum: https://www.youtube.com/watch?v=fro-L5gSyh4

Make a high temperature heating mantle: https://www.youtube.com/watch?v=N5meDWAqYes

Platinum bar dissolving in acid: https://www.youtube.com/watch?v=APxL87X92t4

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Видео Platinum Recovery from Laboratory Chemical Waste (Pt 2) канала NurdRage