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从焚烧的污水泥灰中选择性出和回收,添加CaO

Zhonghua Yang¹, Chuanming Du², Ruiyuan Yuan¹

¹School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, PR China.

Waste management (New York, N.Y.)

|December 11, 2024

概括

这项研究提出了一种从焚烧污水泥灰 (ISSA) 中回收的新方法. 该过程使用高温反应与氧化 (CaO),选择性液和沉来有效提取有价值的资源.

科学领域:

环境化学环境化学
材料科学材料科学材料科学
废物管理废物管理

背景情况:

焚烧污水泥灰 (ISSA) 是丰富的 (P) 来源,为有限的岩资源提供可持续的替代品.
传统的水电金方法用于从ISSA提取,往往导致大量金属杂质的共同溶解,使回收复杂化并限制应用.
从ISSA中开发高效和成本效益的回收方法对于资源循环和减少对原材料的依赖至关重要.

研究的目的:

开发和验证一种新的,综合的工艺,以高效,低成本地从ISSA中回收.
研究在热处理过程中添加氧化 (CaO) 在转化矿物相和促进选择性出过程中的作用.
优化选择性浸出和化学沉步骤,以获得高回收和纯度.

主要方法:

通过对ISSA进行高温处理,并添加不同的CaO (高达1050°C).
从热处理的灰中选择性地出酸溶性酸相,通过控制液pH值.
从液中化学沉以回收高纯度的酸盐产品.

主要成果:

在热处理过程中添加20%的CaO有效地将Al/Fe-酸相转化为酸溶性Ca-酸相,同时保留Al和Fe在酸不溶性分数中.
在pH值1.5的选择性水实现了高回收 (94.71%) 与最小的杂质溶解 (Al,Fe,Si<10%).
在pH 8.5的化学沉产生了高纯度的酸 (HAP) 沉物,其P2O5含量为37.51%,杂质水平较低,总体回收效率为94.07%.

结论:

高温反应与CaO,选择性浸出和化学沉的结合方法为从ISSA回收提供了一种高效和成本效益的途径.
这种方法成功地将与Al,Fe和Si等主要杂质分离出来,从而生产出有价值的缩物.
剩余的固体部分富含和,为进一步利用资源提供了机会,提高了该过程的整体可持续性.

关键词:

另外还添加了CaO.氧亚帕提特是一种氧亚帕提特.这就是ISSASA ISSA.的回收使用方法选择性洗是一种选择性的洗.

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