Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

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Gold in sulphide (1 reply)

10 months ago
morin2001 10 months ago

Hi I’ve got a concentrate I have made with flotation, most free gold is already out by gravity. Now I have a concentrate of pyrite gold and a trace of copper but not much. There is no arsenic. I was looking for some advice on what would be the best Method to recover this gold. The gold is within the pyrite/sulphide as well. I don’t want to go with a leach I would like to go with a roast since I already have a rotary roaster with scrubber for any gasses produce. But I have no idea what to do after I roast it. I was maybe considering a smelt but I need some advice. 

10 months ago
Jorge 10 months ago

It is possible to consider a roasting process as a pre-treatment to treat a flotation concentrate to eliminate Sulphur and liberate some tiny gold particles. The roasting product is called calcine and a cyanidation process is necessary to treat the calcine. Gas treatment is necessary to avoid polluting emissions.

It is important to perform a testing program in the met lab to determine the key parameters of the roasting process. The effect of temperature is important. The program can evaluate 400, 450, 500, 550, 600, 650 a 700 oC. The roasting product is treated by cyanidation. The gold extraction will indicate the optimum range of temperature. If the gold extraction is not good, it is necessary to regrind the calcine and perform a new cyanidation testing program to determine the cyanide addition, the leaching time, the pH and lime addition.

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