Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

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Cyanide, pyrite sulfide ore, micro gold extraction (3 replies and 2 comments)

J
Joeram
6 years ago
Joeram 6 years ago

I tried every acid combination. I tried roast and smelt with different fluxes. I have 2 assay's and a Lab report on my ore.I sent cons not rock, so they could only give me the amount per what I sent not on per ton. Au,lr,pd,pt&rh. It takes 1 -5 gallon bucket of rock to get a pound of cons. Give or take about a gram of each pm's. None ever said arsenic and sulfur will give me a problem.  AR acid no drops with SMB or Oxalic. I get drops with sodium hydroxide, put back in nope. I sent cons off and this refiner said my problem is arsenic and sulfur. So I tried a 1,000 degree roast mixing. Nope. I now am going to try sod. cyanide, but will the arsenic and sulfur prevent me again? Can they be removed first? I read on here that arsenic and sulfur means more cyanide, then more zinc to precipitate, possible foul solution. I read roast, rinse w/ water then soak in phosphoric acid 2 days, rinse good then into cyanide. Any HELP with this would be appreciated. I need a step by step process, since I am alone on this and never processed gold. Micro gold and pyrite's

R
Bhaduri
6 years ago
Bhaduri 6 years ago
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1 like by David

Suggest you obtain John Marsden's treatise on Chemistry of Au extraction for educating yourself. Without really understanding what you are attempting to do, it is difficult to formulate a process. First send the composition of your ore or concentrate?, including As, S, humic C, Sb etc, degree of Si encapsulation if any & then we'll attempt a path forward.

J
Joeram
6 years ago
Joeram 6 years ago
Like

I have a old book on pdf cyanide hand book. What all these letters are I dont know. If your asking composition as in copper iron sulfur arsenic amounts? This I dont have and no time to send sample off, sit back and wait for it. I verbally spoke to lab, said arsenic, sulfur, encapsulated in sulfides, with some micro. Was told grind fine in ball mill, roast until no smell dump in water to rinse. Then go what ever way from there. I did smelt with lead, yes cupelled down got pm's, but not economical. AR didnt work, positive stannous but no SMB drop. Lab said because there is still sulfur. Now I have a test run in 5kg roasted cons, 10 liters water, 200 gram cyanide, air and mix for 48 hours, added 100 gram activated carbon, mix another 8 hours. Getting ready to strain off the AC, dry and ash. Then smelt with same amount of borax. Then nitric/water soak that, then melt.

Mike
6 years ago

As,= arsenic,
S = sulfur,
humic C = organic carbon,
Sb = stibbnite etc,
degree of Si = silica (often expresied as quartz) encapsulation

J
Joeram
6 years ago

SmartDog, No I dont have anything that says these amounts. Just assay's Au,Ir,Pd,Pt,&Rd. I know I have silver my nitric soaks turns green/blue and I have copper my smelts then cupelled down I can see the copper. Mercury in ball mill with lime water and 5kg cons, produced a 111 gram amalgam ball, soaked in nitric/water for 3 days, nothing left in bottom.I wish I could get help. Everything I am doing is guess, reading here on 911.

J
Jose Doneiber
5 years ago
Jose Doneiber 5 years ago
Like
  • Hello, Joeram.
    Nice to meet you.
    Can you please give me a copy of your manual cyanide pdf ?.
    I am very attentive.
    Thank you

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