So what to do with the fine dust? I have read about adding lead but
not sure how much to use or what I am looking for.
If you never done refining before and not will be doing it in the
future, may be the best is to let refiner handle it. It will not pay
to do setup for one time use. It also requires knowledge in handling
If you still want to go ahead, you have to get yourself a book on
the subject, because there are details to the process which has to be
studied carefully before beginning.
In broad overview, one smelts dust with fine silver in proportion 1
part of dust to 3 parts of silver; then result is treated with hot
nitric acid (good ventilation is a must); then hot sulphuric acid on
the chance that lead is present; then aqua regia to dissolve all
Then metals have to be precipitated from solutions and precipitates
Silver is precipitated by table salt (my preference) giving silver
chlorate, to smelt which requires good ventilation.
Gold is precipitated by zinc (my preference as well). Gold forms
brown platelets which is pure metal and smelting does not present any
That is it in a nutshell. There are many intermediary steps of
filtering and washing and testing to see if everything is going
right, and if there are any other metals present. So good book is a