Leaching Reagents H.Naderi, Mining Engineering Department, Yazd University, 2011

Leaching Reagents H.Naderi, Mining Engineering Department, Yazd University, 2011

Leaching Reagents H.Naderi, Mining Engineering Department, Yazd University, 2011

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

Leaching Reagent Properties H.Naderi, Mining Engineering Department, Yazd University, 2011  More Expensive  Negligible Corrosion problems  More Selective: Limestone, dolomite etc do not react

Leaching Reagent Properties H.Naderi, Mining Engineering Department, Yazd University, 2011 Insoluble Foaming Acid is consumed Solution contamination with Fe+3

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 ̊ C H.Naderi, Mining Engineering Department, Yazd University, 2011

Water H.Naderi, Mining Engineering Department, Yazd University, 2011

Acids H.Naderi, Mining Engineering Department, Yazd University, 2011

Acids H.Naderi, Mining Engineering Department, Yazd University, 2011

Acids H.Naderi, Mining Engineering Department, Yazd University, 2011 Dilute sulphuric acid Copper oxide ores Zinc Oxide Phosphate rock…

Acids H.Naderi, Mining Engineering Department, Yazd University, 2011 Leaching in a sulphuric acid media under oxidasing conditions: Oxygen: Oxidasion Easily Soluble metal sulphate

Acids H.Naderi, Mining Engineering Department, Yazd University, 2011 Leaching in a sulphuric acid media under oxidasing conditions: Nitric Acid: Ferric Sulphate:

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:

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:

Acids H.Naderi, Mining Engineering Department, Yazd University, 2011 Aqua regia:

Bases H.Naderi, Mining Engineering Department, Yazd University, 2011 NaOH:

Bases H.Naderi, Mining Engineering Department, Yazd University, 2011 Ammonium hydroxide:

Aqueous Salt Solutions H.Naderi, Mining Engineering Department, Yazd University, 2011

Aqueous Salt Solutions H.Naderi, Mining Engineering Department, Yazd University, 2011

Aqueous Salt Solutions H.Naderi, Mining Engineering Department, Yazd University, 2011

Aqueous Salt Solutions H.Naderi, Mining Engineering Department, Yazd University, 2011

Aqueous Salt Solutions H.Naderi, Mining Engineering Department, Yazd University, 2011

Leaching Reagents H.Naderi, Mining Engineering Department, Yazd University, 2011