Kinetic study on elemental mercury release from fly ashes and hydrated fly ash cement pastes

被引：3
|
作者：
Du, Wen [1 ]
Zhang, Chao-yang [1 ]
Kong, Xiang-ming [1 ]
Zhuo, Yu-qun [2 ]
机构：
[1] Tsinghua Univ, Dept Civil Engn, Key Lab Safety Durabil, China Educ Minist, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Energy & Power Engn, Key Lab Thermal Sci & Power Engn, China Educ Minist, Beijing 100084, Peoples R China
来源：
CHEMOSPHERE | 2020年 / 241卷
基金：
中国国家自然科学基金;
关键词：
Elemental mercury; Release; Kinetic; fly ash; Cement; PHOTOCHEMICAL REMOVAL; CLASS F; EMISSIONS; PERFORMANCE; FLUX;
D O I：
10.1016/j.chemosphere.2019.125028
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The kinetics of elemental mercury (Hg-0) release from fly ashes and hydrated fly ash cement pastes was investigated using a homemade Hg measurement system. Three types of fly ash (FA) and ordinary Portland cement (OPC) were used to prepare cement pastes. After standard curing for 28 days, the hydrated cement paste (HCP) was ground into a fine powder for Hg emission measurements. Detectable Hg-0 was found released from both fly ashes and hydrated fly ash cement pastes. The results show that elevated temperatures and evaporation of the capillary pore water in wet HCP samples accelerate Hg-0 release. Both desorption of Hg-0 from the particle surface of HCP powder and migration of Hg-0 from the inner pores contribute to Hg-0 release. The kinetic calculation indicates that the hydration products of hydrated fly ash cement have little immobilization effect on Hg-0, which is mainly physically encapsulated in the HCP particles by hydration products. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：9
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