Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning 2017-04-21T02:33:06+00:00
  • 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.

effect of borax during smelting (6 replies and 1 comment)

applelab
1 year ago
applelab 1 year ago

i read that borax (flux) reduce the melting temperature of gold during smelting. How is this so? Thanx.

jpearcy
1 year ago
jpearcy 1 year ago
1 like by David

Borax and lime are used as flux agents in the cupellation process to separate silver and gold from base metals and other impurities. The process is carried out at temperatures between 800 and 900°C, i.e. lower than the melting point of the noble metals, and even below the temperature at which the slag becomes totally molten. Base metals are oxidized and removed with the slag, while gold and silver, which do not oxidize, sink and build up, leading to doré bars for further partitioning and refining. This process would only be economical if silver and/or gold are pre-concentrated first, as it is the case in anode slimes from copper electrolytic refining.

applelab
1 year ago

thank you

GeoffC
1 year ago
GeoffC 1 year ago
1 like by David

Borax along with other flux reagents form a slag to remove impurities during smelting. This usually takes place at lower temperatures than the melting of dore. A presentation from Trainor in 1986 explains a lot of what happens during smelting.

David
1 year ago
David 1 year ago

Use the Social Share Bar on the Left. Tell everyone you can about https://www.911metallurgist.com/metallurgy/ It's FREE & GOOD.

Bhaduri
12 months ago
Bhaduri 12 months ago

A free copy of "A textbook of Fire Assaying", by Bugbee (1922), is available on the web; this tome encapsulates the fusion reactions occurring during smelting of PM ores in the presence of multiple fluxes including borax.

kannan
11 months ago
kannan 11 months ago

Is any other flux available for smelting low grade gold. 

How to improve the smelting yield?

 

dhaefi
11 months ago
dhaefi 11 months ago

how we can we determine the concentrate of borax that is use to burning gold ore

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

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

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.