铜尾矿在低强度混凝土和垂直屏障中的可持续利用
发布时间：2021-08-08 09:57
矿物加工中涉及的冶金过程会产生大量的废物,可能会引起各种各样的环境问题。由于低等级矿石的开采和经济效益的最大化,铜尾矿的处置对矿山企业来说是一项艰巨而繁琐的工作,如果不进行严密的监测,不加强对尾矿的管理,会导致环境污染。在赞比亚,铜尾矿的累积量不断增加,重金属渗入附近水体,并在河流和溪流中沉积。另一方面,以前的研究人员已经记录到,露天燃烧、废旧轮胎的储存/填埋会导致重金属的浸出、有毒气体进入生态环境。基于以往的研究人员记录的建筑业中铜尾矿和轮胎衍生集料的使用情况,人们越来越认识到铜尾矿和轮胎衍生集料对环境的不利影响以及混凝土集料原材料成本的增加问题。本研究以五种不同的铜尾矿为研究对象,将铜尾矿作为低强度混凝土中的天然细集料替代材料,同时用铜尾矿和轮胎衍生集料替代多种天然细集料。从中国和赞比亚采集了五种铜尾矿样品,其中的两种铜尾矿来自中国云南省,命名为云南铜尾矿I与II,其他三种铜尾矿来自赞比亚铜带省的Kakosa、Muntimpa和Mindolo尾矿储存场地。以铜尾矿作为细集料替代料的混凝土试样,其无侧限抗压强度可达到35.6MPa,30%铜尾矿替代料的无侧限抗压强度最高,28.77%...
【文章来源】：东南大学江苏省 211工程院校 985工程院校 教育部直属院校
【文章页数】：112 页
【学位级别】：硕士
【文章目录】：
DEDICATION
摘要
ABSTRACT
ACKNOWLEDGEMENTS
CHAPTER 1 INTRODUCTION
1.1 Research Background
1.2 Problem statement
1.3 Objectives
1.4 Primary objective
1.5 Sub objectives
1.6 Research questions
1.7 Hypothesis
CHAPTER 2 LITERATURE REVIEW
2.1 CT as FA
2.2 TDAs
2.3 Vertical Cut-off wall
CHAPTER 3 MATERIALS AND METHODS
3.1 Materials
3.1.1 Characteristics of the utilized FA and CA
3.1.2 Designed concrete mix proportions
3.1.3 pH of raw CT
3.1.4 Raw CTs TCLP test
3.1.5 Mortar paste mix design
3.1.6 Copper tailing Cement (CTC) Samples
3.1.7 CT cement bentonite (CTCB)and Nanjing silt cement bentonite (NSCB)
3.2 Methods
3.3 Methods for low strength concrete and mortar paste
3.4 Methods for mortar paste
3.5 Methods for the permeability of fine grained CT<0.074mm
CHAPTER 4 LOW STRENGTH CONCRETE AND MORTAR PASTE
4.1 Unconfined compressive strength (UCS)
4.2 Leachate pH and leachability of heavy metals in concrete specimens
4.3 Mortar paste analysis
4.4 Microstructure analysis in the concrete mix
4.4.1 X-Ray diffraction (XRD) analysis
4.4.2 Scanning Electron Microscope (SEM) analysis
CHAPTER 5 VERTICAL CUT-OFF WALL
5.1 Kakosa-CT and Soil Classification
5.2 Dry density and optimum water content
5.3 Workability of the NSCB and CTCB
5.4 Permeability Test
5.4.1 Permeability of compacted CT<0.074mm
5.4.2 Permeability of compacted CTC,CTC paste,CTCB and NSCB
5.4.3 Calculation of effective stress,cell and seepage pressure
5.4.4 Testing procedure
5.4.5 UCS of compacted cemented CT (CTC) and CTC paste samples
5.4.6 Permeability and UCS of CTCB and NSCB sample
CHAPTER 6 CONCLUSION AND RECOMMENDATION FOR FUTURERESEARCH
6.1 Conclusions
6.2 Recommendation for future research
REFERENCES
AUTHOR INTRODUCTION
PUBLICATIONS
APPENDIX A. LETTER TO THE GEOLOGICAL SURVEY OF ZAMBIA
APPENDIX B (Ⅰ). MINERAL VALUATION CERTIFICATE
APPENDIX B (Ⅱ).MINERAL VALUATION CERTIFICATE
APPENDIX C. MINERAL ROYALTY CERTIFICATE
【参考文献】：
期刊论文
[1]活性MgO碳化固化土的渗透特性研究[J]. 王亮,刘松玉,蔡光华,唐昊陵. 岩土工程学报. 2018(05)
本文编号：3329743
【文章来源】：东南大学江苏省 211工程院校 985工程院校 教育部直属院校
【文章页数】：112 页
【学位级别】：硕士
【文章目录】：
DEDICATION
摘要
ABSTRACT
ACKNOWLEDGEMENTS
CHAPTER 1 INTRODUCTION
1.1 Research Background
1.2 Problem statement
1.3 Objectives
1.4 Primary objective
1.5 Sub objectives
1.6 Research questions
1.7 Hypothesis
CHAPTER 2 LITERATURE REVIEW
2.1 CT as FA
2.2 TDAs
2.3 Vertical Cut-off wall
CHAPTER 3 MATERIALS AND METHODS
3.1 Materials
3.1.1 Characteristics of the utilized FA and CA
3.1.2 Designed concrete mix proportions
3.1.3 pH of raw CT
3.1.4 Raw CTs TCLP test
3.1.5 Mortar paste mix design
3.1.6 Copper tailing Cement (CTC) Samples
3.1.7 CT cement bentonite (CTCB)and Nanjing silt cement bentonite (NSCB)
3.2 Methods
3.3 Methods for low strength concrete and mortar paste
3.4 Methods for mortar paste
3.5 Methods for the permeability of fine grained CT<0.074mm
CHAPTER 4 LOW STRENGTH CONCRETE AND MORTAR PASTE
4.1 Unconfined compressive strength (UCS)
4.2 Leachate pH and leachability of heavy metals in concrete specimens
4.3 Mortar paste analysis
4.4 Microstructure analysis in the concrete mix
4.4.1 X-Ray diffraction (XRD) analysis
4.4.2 Scanning Electron Microscope (SEM) analysis
CHAPTER 5 VERTICAL CUT-OFF WALL
5.1 Kakosa-CT and Soil Classification
5.2 Dry density and optimum water content
5.3 Workability of the NSCB and CTCB
5.4 Permeability Test
5.4.1 Permeability of compacted CT<0.074mm
5.4.2 Permeability of compacted CTC,CTC paste,CTCB and NSCB
5.4.3 Calculation of effective stress,cell and seepage pressure
5.4.4 Testing procedure
5.4.5 UCS of compacted cemented CT (CTC) and CTC paste samples
5.4.6 Permeability and UCS of CTCB and NSCB sample
CHAPTER 6 CONCLUSION AND RECOMMENDATION FOR FUTURERESEARCH
6.1 Conclusions
6.2 Recommendation for future research
REFERENCES
AUTHOR INTRODUCTION
PUBLICATIONS
APPENDIX A. LETTER TO THE GEOLOGICAL SURVEY OF ZAMBIA
APPENDIX B (Ⅰ). MINERAL VALUATION CERTIFICATE
APPENDIX B (Ⅱ).MINERAL VALUATION CERTIFICATE
APPENDIX C. MINERAL ROYALTY CERTIFICATE
【参考文献】：
期刊论文
[1]活性MgO碳化固化土的渗透特性研究[J]. 王亮,刘松玉,蔡光华,唐昊陵. 岩土工程学报. 2018(05)
本文编号：3329743
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