从炼渣中排毒,通过减少酸出
Lin Yu1, Siying Zhao1, Jianping Guo1
1School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Waste management (New York, N.Y.)
|June 20, 2025
概括
化渣 (LSS) 含有有毒的 (Tl). 使用NH2OH·HCl,氧化酸和酸的新型还原性漏系统有效地从LSS中去除Tl,符合环境标准.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 化渣 (LSS) 是碳酸生产中的危险废物.
- 由于与有毒的 (Tl) 相结合,LSS 构成环境风险.
- 在提取过程中被激活,增加了其对环境的危害.
研究的目的:
- 为LSS开发一种高效的TL排毒方法.
- 为了研究一种用于提取TI的新型还原性漏系统.
- 建立一个绿色,经济和有效的方法来治疗LSS.
主要方法:
- 开发了一种使用NH2OH·HCl,氧酸和酸的还原性漏系统.
- 优化漏条件,包括试剂比率,度,液体-固体比率和温度.
- 分析了TI漏率,残留度和漏机制.
- 通过收缩核心模型研究出水动力学和热力学.
主要成果:
- 在最佳条件下实现了91.7%的TI漏率.
- 在洗后的残留物中降低了TI度,低于I类标准值 (<5μg L-1).
- 标识到的Tl主要与Fe-Mn氧化物结合,并封装在石膏中.
- 阐明了涉及石膏溶解和减小Tl释放的协同机制.
结论:
- 该NH2OH·HCl-酸-酸系统提供了高效的TL排毒从LSS.
- 该过程是通过扩散控制的,并且具有较低的激活能量,表明试剂运输效率高.
- 这项研究提供了一种绿色,经济和有效的解决方案,用于管理TL污染的LSS.
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