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由老化处理引起的煤灰的改变:矿物质量化分析的见解

Tsugumi Seki¹, Tatsuru Takahashi², Taiji Chida¹

¹Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aoba 6-6-01-2, Aramaki, Aoba, Sendai 980-8579, Japan.

|October 27, 2025

概括

煤炭飞灰 (FA) 的老化会改变其矿物成分和有毒元素的泄. 最初的pH值显著影响了这种环境变化,影响了二次矿物质的形成和,和等元素的固定.

科学领域:

环境科学环境科学
地质化学地质化学
材料科学材料科学材料科学

背景情况:

煤炭飞灰 (FA) 是燃烧煤炭的副产品,具有潜在的环境影响.
了解FA的改变行为对于管理有毒元素漏至关重要.
矿物释放分析 (MLA) 是一种用于表征复杂异质材料的技术.

研究的目的:

研究煤炭飞灰 (FA) 矿物成分的老化影响.
阐明FA的改变行为及其对有毒元素 (B,As,Se) 浸出的影响.
评估初始pH在FA环境转变中的作用.

主要方法:

三种初始pH值为4,9和12的日本煤炭飞灰 (FA) 接受了老化处理.
进行了水实验,以评估有毒元素的释放.
矿物释放分析 (MLA) 用于确定矿物学变化.

主要成果:

在pH12时老化的FA显示B和Se的出减少,矿物质变化较小,矿石略有增加.
在pH 4中老化的FA没有显示出有毒元素漏的减少,而石英由于酸溶解而显著增加.
在pH值9时老化的FA显示B和Se的浸出略有减少,石英和岩的增加,以及潜在的单硫酸盐形成.

结论:

煤灰的初始pH值极大地影响其老化行为和有毒元素的固定.
二次矿物阶段形成,如石和石英,在改变漏特性方面发挥着关键作用.
矿物释放分析 (MLA) 是有效的特征复杂的矿物质变化在环境材料,如飞灰.

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