1 Introduction

1.1 Dust source in open-pit mine. 7

1.1.1 Dust generated by drilling operation. 7

1.1.2 Dust generated by drilling operation. 8

1.1.3 Dust generated by shoveling and loading operation. 8

1.1.4 Dust generated by transportation operation. 8

1.1.5 Dust generated by dumping operation. 8

1.2 Calculation of the intensity of dust source in the mine. 9

1.2.1 Source intensity of the mine. 9

1.2.2 Calculation of the source intensity of the mine. 10

1.3 Development status of chemical depression of dust 16

1.3.1 Research status of dust suppressants abroad. 17

1.3.2 Research status of domestic dust suppressants 19

1.3.3 Development trend of chemical dust suppressants 21

Reference. 22

2 Basic theory of chemical suppression of dust 24

2.1 Properties of mine dust ^[1-5] 25

2.1.1 Wettability of mine dust^[1] 25

2.1.2 Density of mine dust^[2] 26

2.1.3 Specific surface area of mine dust^[3] 27

2.1.4 Suspensibility and cohesiveness of mine dust^[3] 27

2.1.5 Particle size and size distribution of mine dust^[4-5] 28

2.2 Basic theory of chemical suppression of dust 34

2.2.1 Surface tension and surface free energy^[6-9] 34

2.2.2 Measurement of surface tension ^[10-11] 39

2.2.3 Wetting phenomenon ^[9-12] 51

2.2.4 Determination method of wettability^[13] 54

2.2.5 Contact angle and Young's equation^[14] 54

2.2.7 Measurement of contact angle. 59

Reference. 62

3 Mechanism of Production and Transport of Blasting Dust and Smoke of Open-pit Mine and Study on Pollution Model 64

3.1 Mechanism of Production and Transport of Blasting Dust and Smoke of Open-pit Mine^[1] 64

3.2 Study on Pollution Model of Blasting Dust and Toxic Gases 65

3.2.1 Diffusion and Settling of Blasting Dust 65

3.2.2 Mathematical Model of Gaseous Substance Motion of the Dust and Smoke. 68

3.2.3 Evaluation of Blasting Dust and Toxic Gases Pollution. 71

3.2.4 The Emission Intensity of the Blasting Dust and Toxic Gases 75

3.3 Computer Numerical Simulation Study on Mine Blasting Dust and Toxic Gases 78

3.3.1 Computer Numerical Simulation of the Initial Motion of Explosive Gas 78

3.3.2 Numerical Simulation of Movement Process of Blasting Dust Particles 81

Reference. 83

4 Chemical Suppression Technology of Open-pit Mine Blasting Dust and Smoke. 85

4.1 Control Measures on Open-pit Mine Blasting Dust 85

4.2 The Development of Water Enriched Gelatin Stemming. 91

4.2.2 The Development of Water Enriched Gelatin Stemming. 91

4.2.3 Dust and Toxic Gases Reduction Effect of Water Enriched Gelatin Stemming. 96

4.2.4 Dust Reduction Effect of Water Enriched Gelatin Stemming. 104

4.2.5 Dust and Toxic Gases Reduction Mechanism of Water Enriched Gelatin Stemming. 106

4.3 Development of Blasting Dust and Smoke Inhibitors of Open-pit Mine. 113

4.3.1 Dust Reduction Mechanism of Blasting Dust and Smoke Inhibitors 113

4.3.2 Component of Dust and Smoke Inhibitors 115

4.3.3 Monomer Experiment 120

4.3.4 Compounding Experiments of Surfactants and Hygroscopic Agents 143

4.3.5 Final Selection of Surfactant and Hygroscopic Agent 146

4.3.6 The Optimal Formula of The Dust and Smoke Inhibitor 149

4.4 Research on Blasting Dust Reduction with Foam.. 155

4.4.1 Formula Requirement of foaming agent 155

4.4.2 Development of Foaming Agent Formula. 160

4.4.3 Experimental Study on Foaming Generator Performance. 164

4.4.4 Experimental Results 166

4.4.5 Measurement of Foam Dust Removal Efficiency. 170

Reference. 172

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