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I need a new method for refining gold from my factory's floor dust?

factory floor dust
we used to burn the floor dust for 600' c (approx.) and we use magnet to remove the iron particles. After removing them we used to wash with water for removing gold dust and ash. we use nitric acid for removing silver, copper, & other metals and we dispose of the nitric.
After that process we add mercury for collecting the gold particles separated and burn out the mercury then melt the remaining gold.

this is my method of gold recovering from dust
I need a new and simple method for extracting gold from dust?

I need a method of how to recover gold from buffing dust?

Shyam Sundar
gold smith - Coimbatore, Tamil Nadu, India
January 22, 2009

In general, the process you are using is standard, except for the use of mercury. I would suggest that you pose your question on goldrefiningforum.com. Also, do a search on that forum. There are several safer alternative methods that have already been covered there.

Chris Owen
- Nevada, Missouri
March 26, 2009

i have a factory. we vacuum the floors daily after work. how do we separate the gold from this dust. we accumulate dust for over a year and then separate using mercury. please suggest any other method.

khiran kumar
manufacturer - Coimbatore, Tamil Nadu, India
September 4, 2009

First clean, then put Aqua Regia (3 hydrochloric acid one nitric acid), then do filtration.

Majed Janineh
- Beith Lehem Palestain
October 1, 2011