Mechanochemical bromination of unburned carbon in fly ash and its mercury removal mechanism: DFT study

2022 ◽  
Vol 423 ◽  
pp. 127198
Author(s):  
Xinze Geng ◽  
Xiaoshuo Liu ◽  
Xunlei Ding ◽  
Qiang Zhou ◽  
Tianfang Huang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Dft Study ◽  
Mercury Removal ◽  
Unburned Carbon ◽  
Removal Mechanism

"Recent Patents on the Triboelectrostatic Separation of Fly Ash"

2019 ◽  
Vol 13 ◽  
Author(s):  
Haisheng Li ◽  
Wenping Wang ◽  
Yinghua Chen ◽  
Xinxi Zhang ◽  
Chaoyong Li
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
High Efficiency ◽  
Separation Efficiency ◽  
High Reliability ◽  
Operating Conditions ◽  
Security Requirements ◽  
Unburned Carbon ◽  
Efficient Operation ◽  
Triboelectrostatic Separation

Background: The fly ash produced by coal-fired power plants is an industrial waste. The environmental pollution problems caused by fly ash have been widely of public environmental concern. As a waste of recoverable resources, it can be used in the field of building materials, agricultural fertilizers, environmental materials, new materials, etc. Unburned carbon content in fly ash has an influence on the performance of resource reuse products. Therefore, it is the key to remove unburned carbon from fly ash. As a physical method, triboelectrostatic separation technology has been widely used because of obvious advantages, such as high-efficiency, simple process, high reliability, without water resources consumption and secondary pollution. Objective: The related patents of fly ash triboelectrostatic separation had been reviewed. The structural characteristics and working principle of these patents are analyzed in detail. The results can provide some meaningful references for the improvement of separation efficiency and optimal design. Methods: Based on the comparative analysis for the latest patents related to fly ash triboelectrostatic separation, the future development is presented. Results: The patents focused on the charging efficiency and separation efficiency. Studies show that remarkable improvements have been achieved for the fly ash triboelectrostatic separation. Some patents have been used in industrial production. Conclusion: According to the current technology status, the researches related to process optimization and anti-interference ability will be beneficial to overcome the influence of operating conditions and complex environment, and meet system security requirements. The intelligent control can not only ensure the process continuity and stability, but also realize the efficient operation and management automatically. Meanwhile, the researchers should pay more attention to the resource utilization of fly ash processed by triboelectrostatic separation.

Mechanism study of mechanochemical bromination on fly ash mercury removal adsorbent

Chemosphere ◽  
2021 ◽  
Vol 274 ◽  
pp. 129637
Author(s):  
Xinze Geng ◽  
Yufeng Duan ◽  
Shilin Zhao ◽  
Jiwei Hu ◽  
Weimeng Zhao
Keyword(s):  
Fly Ash ◽  
Mercury Removal ◽  
Mechanism Study

Impact of the mercury removal system using modified fly ash on particulate matter emission

Fuel ◽  
2021 ◽  
Vol 301 ◽  
pp. 121054
Author(s):  
Yue Peng ◽  
Tao Wang ◽  
Yongzheng Gu ◽  
Jiawei Wang ◽  
Yongsheng Zhang ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Fly Ash ◽  
Mercury Removal ◽  
Particulate Matter Emission ◽  
Modified Fly Ash ◽  
Removal System

Molecular-level insights into mercury removal mechanism by pyrite

2018 ◽  
Vol 344 ◽  
pp. 104-112 ◽  
Author(s):  
Yingju Yang ◽  
Jing Liu ◽  
Feng Liu ◽  
Zhen Wang ◽  
Sen Miao
Keyword(s):  
Molecular Level ◽  
Mercury Removal ◽  
Removal Mechanism

A Flotation Collector for the Separation of Unburned Carbon from Fly Ash

2005 ◽  
Vol 25 (2) ◽  
pp. 67-80 ◽  
Author(s):  
Jan Drzymala ◽  
J. T. Gorke ◽  
T. D. Wheelock
Keyword(s):  
Fly Ash ◽  
Unburned Carbon ◽  
Flotation Collector

scholarly journals Ultra-high-performance concrete with local high unburned carbon fly ash

DYNA ◽  
2021 ◽  
Vol 88 (216) ◽  
pp. 38-47
Author(s):  
Joaquín Abellán García ◽  
Nancy Torres Castellanos ◽  
Jaime Antonio Fernandez Gomez ◽  
Andres Mauricio Nuñez Lopez
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Unburned Carbon ◽  
High Tech ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete ◽  
The Cost

Ultra-high-performance concrete (UHPC) is a kind of high-tech cementitious material with superb mechanical and durability properties compared to other types of concrete. However, due to the high content of cement and silica fume used, the cost and environmental impact of UHPC is considerably higher than conventional concrete. For this reason, several efforts around the world have been made to develop UHPC with greener and less expensive local pozzolans. This study aimed to design and produce UHPC using local fly ash available in Colombia. A numerical optimization, based on Design of Experiments (DoE) and multi-objective criteria, was performed to obtain a mixture with the proper flow and highest compressive strength, while simultaneously having the minimum content of cement. The results showed that, despite the low quality of local fly ashes in Colombia, compressive strength values of 150 MPa without any heat treatment can be achieved.

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