通过酸盐和从污泥焚烧灰中回收的铁合成LiFePO4,以及从缩盐中提取的Li
Xiangyang Wang1, Chen Shi1, Bohan Zhao1
1Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing 100044, PR China.
Water research
|August 21, 2024
概括
这项研究从污泥焚烧灰中回收,以制造有价值的铁酸盐和铁酸盐产品. 它还从盐水中提取,证明了电池材料的可持续方法.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 电化学 电化学 电化学
背景情况:
- 污泥焚烧灰 (SIA) 是 (P) 的潜在来源.
- 铁酸盐 (LiFePO4) 对于可充电电池至关重要,增加了对 (Li) 的需求.
- 陆地资源面临潜在的枯竭,需要采用替代的开采方法.
研究的目的:
- 从SIA中回收,用于合成增值铁酸盐 (FePO4) 和LiFePO4.
- 为了探索铁和酸的共同提取从SIA液使用酸 (TBP).
- 研究使用TBP-FeCl3-煤油系统从盐水中提取,并随后生产Li2CO3.
主要方法:
- 使用TBP从SIA液中同时提取H3PO4和Fe3+.
- 调整pH值以从剥离的溶液中形成FePO4.
- 使用TBP-FeCl3-煤油系统从盐湖盐水中提取.
- 使用HCl的剥离和Li2CO3形成.
- 使用氧化离子网 (HMO) 从淡化盐水中吸附Li2CO3.
- 从回收的FePO4和提取的Li2CO3.3中合成LiFePO4.
主要成果:
- 通过调整剥离溶液的pH值为1.6.,形成了31.2重%Fe和17.6重%P的FePO4.
- 从盐水中获得有效的提取 (78.7%) 和高分离因子 (β = 186.0-217.4).
- 高纯度的Li2CO3 (高达99.7%重量%) 通过两种不同的提取方法获得.
- 合成的LiFePO4表现出与商业材料相美的电化学特性.
结论:
- 从SIA中回收可以合成FePO4和LiFePO4.
- 基于TBP的系统有助于有效地从盐水中提取.
- 这种综合方法为从废物和替代资源生产关键电池材料提供了可持续的途径.
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