数字农科院2.0

Selective leaching and recovery of phosphorus from incinerated sewage sludge ash with CaO addition

文献类型： 外文期刊

作者： Yang, Zhonghua;Du, Chuanming;Yuan, Ruiyuan;Guo, Haixin

作者机构：

关键词： ISSA;CaO addition;Selective leaching;Phosphorus recovery;Hydroxyapatite

期刊名称： WASTE MANAGEMENT

ISSN： 0956-053X

年卷期： 2025 年 193 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Incinerated sewage sludge ash (ISSA) with high P2O5 content is a potential phosphorus resource that can replace the non-renewable phosphorus rocks. However, extracting phosphorus from ISSA using hydrometallurgical methods also dissolves a large amount of impurity metals into the leachate. Therefore, this study proposes a new method combining high-temperature reaction with CaO addition, selective leaching, and chemical precipitation for efficient and low-cost phosphorus recovery from ISSA. During thermal treatment at 1050 degrees C, the addition of CaO significantly influenced the types and amounts of phosphate mineral phases in ISSA. When 20 % CaO was added, the Al/Fe-phosphate phases were completely converted into acid-soluble Ca-phosphate phases, while Al and Fe were retained in acid-insoluble phases (e.g., Al- and Fe-containing oxides and silicates). Subsequently, by controlling the pH of acidic leachate (2.0 to 1.5), Ca-phosphate phases were selectively dissolved. At a pH of 1.5, better selective leaching was achieved, with a leaching efficiency of 94.71 % for P and less than 10 % for Al, Fe and Si. The XRF results showed that the majority of SiO2 (38.39 %), Al2O3 (33.26 %) remained in the post- leaching solid residue, which was expected to be further resource utilization. Without purification treatment to remove Al, Fe and Si, almost all phosphate ions were precipitated at pH = 8.5, with P recovery efficiency of 94.07 %. XRD results showed that the precipitate was mainly composed of HAP, with a P2O5 content of 37.51 % and low level of contaminants, thereby realizing the effective recovery of phosphorus from ISSA.

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