There are many ways to refine the jewellery shop dust!
It depends on the percentage of metal in it, if the quantity of gold or silver is more like
(1 kg dust = 10 grams) If it is gold or silver, it will be right to melt it completely and burn the dust well first. When the powder is formed and the smoke stops in it, then cool it and filter it. Take the big pieces, finely chop them. Whatever iron is, remove it with a magnet.
(1/2 kg of borax, and 1/2 kg of sodium carbonate, and 1/2 kg of powders which are the compound of the lead, finely add a crucible.
Put 1/2 kg lead in it and fill all the powder in it,
The temperature of the furnace for melting should be (1700 to 2000 ° C. Melting will begin to boil in 20 to 30 minutes. Mix well with an iron rod. After melting, remove into an Ingot mold,
When cold, separate the slug from the hammer.