Melting impure silver causes a lot of spluttering.

[Amol Gupta]

So I melt my silver in a graphite crucible in a resistive heating furnace.

If my cement silver is pure I do not observe any sputtering and the melt is well behaved.

But if my cement silver is impure(close to 80%) I observe a lot of spluttering and I see a lot of silver attached to the lid of the furnace the sputtering subdues after some time.

I'm pretty sure I'm not the first one observing the phenomena id like to know what other members use to avoid such sputtering(if something like this is possible) and why is it the sputtering only occurs for impure silver while the pure silver(98-99%) behave very well(no sputtering).

 

[anarxi]

So I melt my silver in a graphite crucible in a resistive heating furnace.

If my cement silver is pure I do not observe any sputtering and the melt is well behaved.

But if my cement silver is impure(close to 80%) I observe a lot of spluttering and I see a lot of silver attached to the lid of the furnace the sputtering subdues after some time.

I'm pretty sure I'm not the first one observing the phenomena id like to know what other members use to avoid such sputtering(if something like this is possible) and why is it the sputtering only occurs for impure silver while the pure silver(98-99%) behave very well(no sputtering).

I don't know of any other methods other than to re-dissolve the silver and make it purer.

I have seen that silver cement is also pressed into tubes (for example, using a syringe) and they are melted, so it is less likely to scatter....