Hello,
I have read many posts referring to 'roasting' and 'incinerating' and I am curious as to what the difference is and what exactly they mean. I haven't really found the answers using the search bar. If anyone could point me in the right direction, I would appreciate it.
Basically, as I understand it, 'roasting' is heating PMs after they have been separated from the majority of the base metals. The goal is to further oxidize base metals to make them more soluble, or more susceptible to acid treatment. Heating is not done to the melting point of the PM's involved, rather just a gentle heat treatment, whether it be to buttons, flakes, or powders.
Incinerating, on the other hand, is done at the beginning of recovery, mostly to eliminate carbon, but any other halogens that decide to liberate are welcome to leave as well. Incineration can also be used at any time in any recovery process to 'undo' mistakes and essentially return to square one. This may melt many things, be they base metals or PMs.
The biggest issue with both incinerating and roasting is that any heating of recovered metals comes with the risk of volatilizing them and losing them to either gas, sticking to the incineration vessel or becoming trapped in an alloy with other metals.
Do I have it?
Second, where shall I look to read up the actual ways these two things are accomplished?
Thank you!
I have read many posts referring to 'roasting' and 'incinerating' and I am curious as to what the difference is and what exactly they mean. I haven't really found the answers using the search bar. If anyone could point me in the right direction, I would appreciate it.
Basically, as I understand it, 'roasting' is heating PMs after they have been separated from the majority of the base metals. The goal is to further oxidize base metals to make them more soluble, or more susceptible to acid treatment. Heating is not done to the melting point of the PM's involved, rather just a gentle heat treatment, whether it be to buttons, flakes, or powders.
Incinerating, on the other hand, is done at the beginning of recovery, mostly to eliminate carbon, but any other halogens that decide to liberate are welcome to leave as well. Incineration can also be used at any time in any recovery process to 'undo' mistakes and essentially return to square one. This may melt many things, be they base metals or PMs.
The biggest issue with both incinerating and roasting is that any heating of recovered metals comes with the risk of volatilizing them and losing them to either gas, sticking to the incineration vessel or becoming trapped in an alloy with other metals.
Do I have it?
Second, where shall I look to read up the actual ways these two things are accomplished?
Thank you!