Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning2017-04-21T02:33:06-04:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Pyrometallurgy and Electrometallurgy.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

42 lbs of green polish sweeps (5 replies)

10 months ago
MrTMBjewelry 10 months ago


My wife and I have been in the jewelry industry for several years, from manufacturing, personalizing, packaging, website, branding, and marketing of our own company and line of jewelry. The ups and downs of our retail business have led me to be resourceful and frugal, to say the least. I have saved 42lbs of green polish sweeps and paper filters. I have set up a lab with a fume hood and done some recovery/refining but the polish clogs up the filter. I have realized that smelting it out or assaying it first is the way to go. It has gold, silver, copper, lead, zinc and I have removed most of the iron. I believe most polish is acidic but the green color of the polish is uncommon but shouldn't matter. I have been having trouble getting it hot enough. I have seen induction coils that slip around a graphite crucible but it was small, are these good for a larger? I don't know if I should just try it with a bigger rosebud tip. I have. I have. I have. I have but, I don't have certain knowledge of processes, tools or techniques to make this happen. I know that I am just a tool and a helpful tip away. The oatmeal gets thin around this time of year so I would greatly appreciate any help to figure this out. The metal will be used in the jewelry we make after purification. God bless and Thank you for your time- Dan Carey


John Urban
10 months ago
John Urban 10 months ago

If I were you, I'd give the whole amount to a precious metals refiner that will accept sweeps. Lint from polishing buffs can become very dangerous (guncotton) when treated with nitric acid for removing the silver and gold..

10 months ago
David 10 months ago


Steven Osborne
64 Eagle Creek Trail
Whitefish, Montana 59937 U.S.A.
office: (800) 487-9658 or (406) 862-9220 (direct line)
mobile: (858) 449-477

10 months ago
SipiMetalsCorp 10 months ago

I would suggest a refinery with melting capabilities. It’s important to ensure you have a homogeneous melt, followed by proper sampling for assaying. 

Sipi Metals Corp in Chicago specializes in this kind of material. 

10 months ago
MrTMBjewelry 10 months ago


I figured out that I have an oxidative compound. I tried MB melting flux and it worked. The problem is that it is $30 a cup. I saw Chapmans flux and it seems popular and still fairly expensive. I pulled more metal out than I ever thought would come out. I swept around our engraver and pulled up over an ounce of silver/gold. I had to make my wife promise me she would never clean that area.

Dave Tahija
10 months ago
Dave Tahija 10 months ago

Manhattan Gold & Silver Buys a lot of jewelers sweeps and scrap:



Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs


View the Services we Provide

911Metallurgist Mineral Processing & Process Development Laboratory

We have a metallurgical test for every possible mineral type and treatment.


We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.

I Need Consulting Engineering Help
I Need Ore Laboratory Testing