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Electrochemistry of Flotation of Sulphide Minerals

:	Yuehua Hu, Wei Sun, Dianzuo Wang
:	Electrochemistry of Flotation of Sulphide Minerals
:	Springer-Verlag
:	9783540921790
:	1
:	CHF 87.50
:

:	Physikalische Chemie
:	English

:	210
:	Wasserzeichen/DRM
:	PC/MAC/eReader/Tablet
:	PDF

'Electrochemistry of Flotation of Sulphide Minerals' systematically covers various electrochemical measurements, especially electrochemical corrosive methods, electrochemical equilibrium calculations, surface analysis, semiconductor energy band theory as well as molecular orbital theory. Behaviour and mechanism of collectorless and collector-induced flotation of sulphide minerals in various flotation systems are also discussed. The example of electrochemical flotation separation of sulphide ores shows an industrial application.

Prof. Yuehua Hu is a professor at the School of Minerals Processing& Bioengineering of Central South University and Vice Chairman of the Mineral Processing Committee of the China Nonferrous Metals Society. Dr. Wei Sun is an associate professor at the School of Minerals Processing& Bioengineering of Central South University. Prof. Dianzuo Wang is both a member of Chinese Academy of Sciences and Chinese Academy of Engineering, and a foreign associate of the National Academy of Engineering (USA).

	About Authors	5
	Preface	7
	Table of Contents	9
	Chapter 1 General Review of Electrochemistry of Flotation of Sulphide Minerals	14
	1.1 Three Periods of Flotation of Sulphide Minerals	14
	1.2 Natural Floatability and Collectorless Flotation of Sulphide Minerals	16
	1.3 Role of Oxygen and Oxidation of Sulphide Minerals in Flotation	20
	1.4 Interactions between Collector and Sulphide Minerals and Mixed Potential Model	21
	1.5 Effect of Semiconductor Property of Sulphide Mineral on Its Electrochemical Behavior	25
	1.6 Electrochemical Behaviors in Grinding System	27
	1.7 The Purpose of This Book	32
	Chapter 2 Natural Floatability and Collectorless Flotation of Sulphide Minerals	33
	2.1 Crystal Structure and Natural Floatability	33
	2.2 Collectorless Flotation	36
	2.2.1 Effect of Pulp Potential on Flotation at Certain pH	36
	2.2.2 Pulp Potential and pH Dependence of Collectorless Floatability	37
	2.3 Electrochemical Equilibriums of the Surface Oxidation and Flotation of Sulphide Minerals	41
	2.3.1 The Surface Oxidation of Sulphide Minerals and Nernst Equation	41
	2.3.2 Electrochemical Equilibriums in Collectorless Flotation	43
	2.3.3 Eh-pH Diagrams of Potential and pH Dependence of Flotation	45
	1. Eh-pH Diagram of Chalcopyrite	45
	2. Eh-pH Diagram of Galena	47
	3. Eh-pH Diagram of Pyrite and Arsenopyrite	48
	4. Eh-pH Diagram of Jamesonite	51
	2.4 Electrochemical Determination of Surface Oxidation Products of Sulphide Minerals	54
	2.5 Surface Analysis of Oxidation of Sulphide Minerals	61
	Chapter 3 Collectorless Flotation in the Presence of Sodium Sulphide	66
	3.1 Description of Behavior	66
	3.2 Nature of Hydrophobic Entity	70
	3.3 Surface Analysis and Sulphur-Extract	73
	3.4 Comparison between Self-Induced and Sodium Sulphide-Induced Collectorless Flotation	75
	Chapter 4 Collector Flotation of Sulphide Minerals	76
	4.1 Pulp Potential Dependence of Collector Flotation and Hydrophobic Entity	78
	4.1.1 Copper Sulphide Minerals	78
	1. Chalcocite	78
	2. Chalcopyrite	81
	4.1.2 Lead Sulphide Minerals	82
	1. Galena	82
	2. Jamesonite	89
	4.1.3 Zinc Sulphide Minerals	95
	1. Sphalerite	95
	2. Marmatite	97
	4.1.4 Iron Sulphide Minerals	99
	1. Pyrite	99
	2. Pyrrhotite	101
	3. Arsenopyrite	103
	4.2 Eh-pH Diagrams for the CoUector/Water/Mineral System	104
	4.2.1 Butyl XanthatelWater System	105
	4.2.2 Chalcocite-Oxygen-Xanthate System	107
	4.3 Surface Analysis	108
	4.3.1 UV Analysis of Collector Adsorption on Sulphide Minerals	109
	1. Adsorption of Dithiocarbamate on Jamesonite	109
	2. Adsorption of Dithiocarbamate and Xanthate on Marmatite	109
	4.3.2 FTIR Analysis of Adsorption of Thio-Collectors on Sulphide Minerals	112
	1. Adsorption of Ethyl Xanthate on Pyrrhotite	113
	2. Adsorption of Ethyl Xanthate on Marmatite	115
	3. Adsorption of Ethyl Xanthate on Jamesonite	116
	4. Adsorption of Dithiocarbamate on Pyrrhotite	117
	5. Adsorption of Diethyl Dithiocarbamate on Jamesonite	119
	4.3.3 XPS Analysis of Collector Adsorption on Sulphide Minerals	122
	Chapter 5 Roles of Depressants in Flotation of Sulphide Minerals	125
	5.1 Electrochemical Depression by Hydroxyl Ion	125
	5.1.1 Depression of Galena and Pyrite	126
	5.1.2 Depression of Jamesonite and Pyrrhotite	130
	5.1.3 Interfacial Structure of Mineral/Solution in Different pH Modifier Solution	131
	1. Interfacial Structure of Marmatite/Solution	131
	2. Interfacial Structure of Jamesonite/Solution	133
	5.2 Depression by Hydrosulphide Ion	135
	5.3 Electrochemical Depression by Cyanide	136
	5.4 Depression by Hydrogen Peroxide	137
	5.5 Depression of Marmatite and Pyrrhotite by Thio-Organic Depressants	138
	5.6 Role of Polyhydroxyl and Poly Carboxylic Xanthate in the Flotation of Zinc-Iron Sulphide	142
	5.6.1 Flotation Behavior of Zinc-Iron Sulphide with Polyhydroxyl and Polycarboxylic Xanthate as Depressants	142
	5.6.2 Effect of Pulp Potential on the Flotation of Zinc-Iron Sulphide in the Presence of the Depressant	144
	5.6.3 Adsorption of Polyhydroxyl and Polycarboxylic Xanthate on Zinc-Iron Sulphide	146
	5.6.4 Effect of Polyhydroxyl and Polycarboxylic Xanthate on the Zeta Potential of Zinc-Iron Sulphide Minerals	149
	5.6.5 Structure-Property Relation of Polyhydroxyl and Polycarboxylic Xanthate	150
	Chapter 6 Electrochemistry of Activation Flotation of Sulphide Minerals	155
	6.1 Electrochemical Mechanism of Copper Activating Sphalerite	155
	6.2 Electrochemical Mechanism of Copper Activating Zinc-Iron Sulphide Minerals	159
	6.2.1 Activation Flotation	159
	6.2.2 Effect of Pulp Potential on Activation Flotation of Zinc-Iron Sulphide Minerals	160
	6.2.3 Electrochemical Mechanism of Copper Activating Marmatite	162
	6.2.4 Surface Analysis of Mechanism of Copper Activating Marmatite	163
	6.3 Activation of Copper Ion on Flotation of Zinc-Iron Sulphide Minerals in the Presence of Depressants	165
	6.3.1 Effect of Depressant on the CUS04 Activating Flotation of Zinc-Iron Sulphide Minerals	165
	6.3.2 Influence of Pulp Potential on the Copper Ion Activating Flotation of Zinc-Iron Sulphide Minerals in the Presence of Depressant	168
	6.3.3 Zeta Potential of Zinc-Iron Sulphide Minerals in the Presence of Flotation Reagents	170
	6.4 Surface Chemistry of Activation of Lime-Depressed Pyrite	172