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

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction 2017-04-04T06:57:36+00:00
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Increase Copper Concentrates Leaching Efficiency (6 replies)

Marshal Dienes
2 years ago
Marshal Dienes 2 years ago

I just want to know how to increase leaching efficiency of copper concentrate. Or to have after leaching high grade copper PLS?

Marshal Meru
2 years ago
Marshal Meru 2 years ago

What is the composition of the ore, what the present leach process is and what your leaching yield is? Is there recycling of the raffinate to increase Cu in PLS?

John Koenig
2 years ago
John Koenig 2 years ago

Oxide and sulphide concentrate of copper and cobalt. Sulphide concentrate is roasted and then send to leaching plant. Leaching is under agitated tanks and recycling of raffinate exists also.

Bill Fraser
2 years ago
Bill Fraser 2 years ago

What is your current leaching efficiency of Cu? You may consider the following parameters: Residence time: at least 2 hours, final pH 1.8 - 2, Temp. 40 deg C, the particle size should be fine as you are processing the concentrates and I assume that your agitation is OK. Are you close to these values? For Cobalt you need at least 6 hours of leaching time and 350 mV of ORP.

Victor Bergman
2 years ago
Victor Bergman 2 years ago

I agree with the residence time should be respected, 2h for copper and more or less 6 hours for cobalt because cobalt laying much of a problem after its form, if your concentrated has lots of Co3 + the residence time should be a bit long because there will be lots of reaction among other reduction etc. and this can be a time residence may even go up at 8am for a good leaching efficiency.

The raffinate also plays the role of dilution leaching; your percent solid is how much?

Dizzy Flores
2 years ago
Dizzy Flores 2 years ago

Please also control all incoming and unwanted waters/flows in your circuit. Be sure of all your feeding grade.

Alan Carter
2 years ago
Alan Carter 2 years ago

Look particularly oxide and sulphide or soluble and insoluble copper and cobalt proportion in the feed. What is the residual sulphide content of the roaster calcine? Has your plant still have residual sulphide flotation facilities? You need some characterization and microscopic (liberation) tests on the tails to determine the residual soluble metals proportion and the required residence time and reducing agent for cobalt.


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