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使用MSWI飞灰与工业SiO₂进行热向合成Al替代托伯莫里特,以潜在的高质量利用

Xinlong Chen¹, Deli Wu², Bo Yang¹

¹College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China.

Waste management (New York, N.Y.)

|February 17, 2025

概括

这项研究在较温和的条件下使用工业二氧化 (i-SiO2) 来从焚烧飞灰 (IFA) 中合成Al替代的托伯莫里特 (TOB). 由此产生的TOB显示了高重金属固定性和阴离子交换能力,提高了IFA资源利用率.

科学领域:

材料科学材料科学材料科学
环境化学环境化学
废物管理废物管理

背景情况:

焚烧飞灰 (IFA) 是一个具有挑战性的废物流.
从IFA中合成Al替代托伯莫里特 (TOB) 提供了增值潜力.
目前用于从IFA合成TOB的方法涉及极端条件,并产生低纯度.

研究的目的:

探索使用工业二氧化 (i-SiO2) 来合成来自IFA的Al替代TOB.
在较温和的热水处理 (HT) 条件下实现Al替代TOB的向合成.
提高IFA的资源利用率,以生产高质量的材料.

主要方法:

来自上海和深的IFA用i-SiO2.2进行水热处理 (HT).
反应条件的优化:0.4 mol/L NaOH, 160°C, 24 小时.
合成的Al替代TOB的特性是纯度,重金属固定和阴离子交换能力 (CEC).

主要成果:

从IFA和i-SiO2.2中成功合成具有高转化率的Ca,Si和Al的Al替代TOB.
与之前的研究相比,获得了较温和的HT条件.
合成的TOB显示>98.0重量%的重金属固定和显著的CEC (424.0cmol/kg和241.3cmol/kg).

结论:

工业SiO2在优化,较温和的条件下促进了IFA中Al替代TOB的合成.
合成的TOB表现出优异的重金属固定性和高阴离子交换能力,与商业热石相美.
这种方法显著降低了经济成本,并提高了焚烧飞灰的可持续利用.

关键词:

替代的托伯莫里特.水热处理是一种水热处理.焚烧飞灰的使用方法从废物转化为资源

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