Does dried silver chloride contain only 20% silver? ? ?
Thread Content
A few days ago, the extracted wet silver chloride was dried, and today a small amount of the dry silver chloride was taken for melting; as a result, only a little over 20% silver was obtained. Why is this happening? In the past, I used to achieve over 30% yield when melting wet silver chloride; everyone, **please help me!** ! !
Mainly, the amount of silver that volatilizes during melting is high; it is possible to test the silver content in the smoke and dust.
The temperature wasn’t controlled properly; at 700 degrees Celsius, the volatilization of silver chloride became quite noticeable. The temperature was maintained at 600 degrees Celsius for 2 hours before it was increased again.
If it is dried, it may undergo some oxidation, and melting could reduce the recovery rate
It is likely that oxidation was severe during the drying process, which led to an increased volatilization rate during melting.
Silver oxide has a much lower volatility than silver chloride; it would be great if it could be oxidized. It’s probably because dry silver chloride volatilizes quickly at high temperatures. It’s better to carry out the conversion in a wet alkaline environment.
It might be oxidation; is there any way to fix it?
Agree with the view from Floor 6: first use sodium carbonate for dechlorination to convert it into a carbonate, then carry out alkali fusion, which will definitely result in a much higher yield
Exactly how should it be done? I know this really well
Replacing it with iron will do. The specific method is as follows: Place your silver chloride in a container and add water to it. If there isn’t enough water, you can use iron nails for replacement; make sure the iron nails don’t have too much rust on them, as silver chloride is white. Once the color turns completely gray, it’s done
What I mean is to use iron to displace the silver in silver chloride; by doing so, the result will be much better after melting. However, this displacement process will take some time, so be patient. Silver chloride is white – just wait until all the white color turns gray. If the process is too slow, you can use new iron, making sure there is no rust on it. I’ve done this experiment before, and it definitely works