Journal article
Research on characteristics of heavy metals (As, Cd, Zn) in coal from Southwest China and prevention method by using modified calcium-based materials
Fuel (Guildford), Vol.186, pp.714-725
15/12/2016
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Abstract
•Content, characteristics, transformation of heavy metals in coal and ash are discussed before and after combustion.•Modified calcium carbonate (CaCO3) is used as an additive to treat heavy metals.•The migration and release of heavy metals in coal is studied and tested in the experiments.
Coal plays an important role in the Chinese energy source. The heavy metals released from combustion process stay in the environment and are not easily degraded. This paper examines 8 coal samples from China. It explores the content, characteristics, transformation and control of heavy metals through the microwave digestion, sequential chemical extraction, static burning test and X-ray diffraction (XRD) methods. The zinc (Zn) and cadmium (Cd) in coal mainly exist in exchangeable, sulfide, and residual forms. The arsenic (As) content is mainly present in the sulfide binding state. For these three elements, degrees of organic speciation are not considered to be important and the residue speciation mainly occurs in coal ash. After coal combustion, the heavy metals in coal ash are relatively enriched, and the harm to the environment cannot be ignored. Most of the Cd, As and Zn residues are released into the atmosphere and their volatility rates can be ordered as follows: As>Zn>Cd. There are significant differences in mineral composition between the main phases and mineral carriers of heavy metals in coal and ash. Based on these differences, modified calcium carbonate (CaCO3) is used as an additive. In orthogonal experiment, the optimal parameters for treating heavy metals are the temperature (1000°C), metal salt (Al2(SO4)3), and ion ratio (γ=15). Under this condition, the volatilization rates of heavy metals (As, Cd and Zn) decreased remarkably.
Details
- Title
- Research on characteristics of heavy metals (As, Cd, Zn) in coal from Southwest China and prevention method by using modified calcium-based materials
- Creators
- Shan Li - State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaShengli Guo - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaXiao Huang - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaTao Huang - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaIrshad Bibi - Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, PakistanFaheem Muhammad - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaGuojing Xu - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaZiqiang Zhao - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaLin Yu - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaYujie Yan - College of Resource and Environmental Science, Chongqing University, Chongqing 400044, ChinaBinquan Jiao - State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaNabeel Khan Niazi - Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, PakistanDongwei Li - State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
- Publication Details
- Fuel (Guildford), Vol.186, pp.714-725
- Publisher
- Elsevier Ltd
- Grant note
- This work was supported by the National Natural Science Foundation of China under Grant No. 51274262. Drs Irshad Bibi and Nabeel Niazi are thankful to the University of Agriculture Faisalabad (Pakistan) and University of Bremen (Germany).
- Identifiers
- 991012951198602368
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article