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Generally you are going to float all the sulfides at once along with any free gold, you might want to reconsider your flowsheet.

Thiourea is not used much because gold thiourea complexes are not easily concentrated on an adsorbent medium such as activated carbon. This means that you are restricted to either direct electrowinning from the leach solution and the related destruction of the thiourea or chemical precipitation from the leach solution.

Both of the above involve a filtration stage.

Personally I don't use thiourea because it is a known carcinogen.

That said, if the thiourea leach is totally kept away from UV then it is a very good leach for use with stibnite.

Personally I would look at doing a bulk float and selling the float cons or having them toll treated at a smelter. You can then test the float tails to see if they are worth further treatment.

I have no information on the use of thiocyanate with stibnite.

Deano

<blockquote data-quote="Deano" data-source="post: 232216" data-attributes="member: 40539">Generally you are going to float all the sulfides at once along with any free gold, you might want to reconsider your flowsheet.Thiourea is not used much because gold thiourea complexes are not easily concentrated on an adsorbent medium such as activated carbon. This means that you are restricted to either direct electrowinning from the leach solution and the related destruction of the thiourea or chemical precipitation from the leach solution.Both of the above involve a filtration stage.Personally I don&#039;t use thiourea because it is a known carcinogen.That said, if the thiourea leach is totally kept away from UV then it is a very good leach for use with stibnite.Personally I would look at doing a bulk float and selling the float cons or having them toll treated at a smelter. You can then test the float tails to see if they are worth further treatment.I have no information on the use of thiocyanate with stibnite.Deano</blockquote>

[QUOTE="Deano, post: 232216, member: 40539"] Generally you are going to float all the sulfides at once along with any free gold, you might want to reconsider your flowsheet. Thiourea is not used much because gold thiourea complexes are not easily concentrated on an adsorbent medium such as activated carbon. This means that you are restricted to either direct electrowinning from the leach solution and the related destruction of the thiourea or chemical precipitation from the leach solution. Both of the above involve a filtration stage. Personally I don't use thiourea because it is a known carcinogen. That said, if the thiourea leach is totally kept away from UV then it is a very good leach for use with stibnite. Personally I would look at doing a bulk float and selling the float cons or having them toll treated at a smelter. You can then test the float tails to see if they are worth further treatment. I have no information on the use of thiocyanate with stibnite. Deano [/QUOTE]

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