城市固体废物焚烧飞灰和铁矿石尾矿的分阶段资源利用通过共同减少过程
Shizhao Zhang1, Yuan Ji2, Wenzhi Qi1
1State Key Laboratory of Iron and Steel Industry Environmental Protection, School of Environment, Tsinghua University, Beijing 100084, China.
Journal of hazardous materials
|January 28, 2026
概括
本研究提出了一种新的方法来处理城市固体废物焚烧飞灰 (MSWI-FA),将其与铁矿石尾矿结合起来. 该过程将危险废物转化为安全的玻璃化渣和有价值的金属合金,促进资源利用.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
背景情况:
- 城市固体废物焚烧飞灰 (MSWI-FA) 含有二氧化和有毒金属等危险物质.
- 大量的MSWI-FA需要先进的处理和资源利用技术来减轻环境风险.
研究的目的:
- 开发和验证协同处理过程,以无害处理和资源回收MSWI-FA.
- 将MSWI-FA与铁矿石尾矿 (IOT) 结合起来,以实现有效的废物管理和材料利用.
主要方法:
- 利用IOT中的Si和Al,将SiO2-CaO-Fe2O3系统的点降低到大约1200°C.
- 来自MSWI-FA的杆化C和Ca用于现场减少金属氧化物和化玻璃阶段的粘度调节.
- 优化了在1250°C的过程,保持时间为2.5小时,以实现高效的渣合金分离.
主要成果:
- 生产了一种具有密集结构的玻璃化渣,其出毒性低于标准限值.
- 生成一种富含铁的合金 (>80重量%),富含 siderophile 元素 (Cu,Ni).
- 由于不同的相位接口,可以有效地分离渣和合金.
结论:
- 协同协同处理过程使MSWI-FA和IOT能够同时利用资源并降低环境风险.
- 这种方法为MSWI-FA的处置提供了一种绿色和高效的途径,具有显著的环境效益.
- 该过程促进了贵重金属的回收和从废物中生产安全的建筑材料.
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