leaching reagents h.naderi, mining engineering department, yazd university, 2011
TRANSCRIPT
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Leaching Reagents
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Leaching Reagents
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Leaching Reagents
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Leaching Reagents
Leaching is usually carried out in Water solutions
Often: Addition of other leaching reagents is required
H.Naderi, Mining Engineering Department, Yazd University, 2011
Acids
Bases
Sulphides
Salts
Combination of these
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Leaching Reagent Properties
H.Naderi, Mining Engineering Department, Yazd University, 2011
More ExpensiveNegligible Corrosion problemsMore Selective: Limestone, dolomite etc do not react
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Leaching Reagent Properties
H.Naderi, Mining Engineering Department, Yazd University, 2011
Insoluble
Foaming
Acid is consumedSolution contamination with Fe+3
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Water
• Water alone maybe used for the leaching of roasted
materials such as sulphates and chlorides.
• In the presence of oxygen, some sulphides may be
leached by means of water under pressure and at
temperatures above 150-200 $ C
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Water
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
Dilute sulphuric acid
•Copper oxide ores
• Zinc Oxide
• Phosphate rock…
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
Leaching in a sulphuric acid media under oxidasing
conditions:
Oxygen:
Oxidasion
Easily Soluble metal sulphate
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
Leaching in a sulphuric acid media under oxidasing
conditions:
Nitric Acid:
Ferric Sulphate:
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
HCl has replaced sulfuric acid in many reactions involving iron oxid:
Leaching of ilmenite
Nitric Acid:
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
•The use of nitric acid is limited
•Displacing H2SO4 in some uranium extraction operations: Solve
radium gases problems
Solubilize sulphide minerals:
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Acids
H.Naderi, Mining Engineering Department, Yazd University, 2011
Aqua regia:
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Bases
H.Naderi, Mining Engineering Department, Yazd University, 2011
NaOH:
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Bases
H.Naderi, Mining Engineering Department, Yazd University, 2011
Ammonium hydroxide:
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Aqueous Salt Solutions
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Aqueous Salt Solutions
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Aqueous Salt Solutions
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Aqueous Salt Solutions
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Aqueous Salt Solutions
H.Naderi, Mining Engineering Department, Yazd University, 2011
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Leaching Reagents
H.Naderi, Mining Engineering Department, Yazd University, 2011