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关于全面利用含中和污泥的创新方法

Tianfu Zhang¹, Junwei Han², Liuyang Dong¹

¹State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources, Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, 650093, China.

Journal of environmental management

|February 2, 2024

概括

这项研究引入了一种新的工艺,用于处理含有的危险中和污泥 (ABN),回收有价值的材料,如,高纯度碳酸和硫化,同时最大限度地减少废物. 该方法涉及选择性减少烤,浸和碳化,以有效地管理危险废物.

科学领域:

环境工程环境工程
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:

含的中和污泥 (ABN) 是非铁业的危险废物,具有环境和健康风险.
目前的储存方法会带来高税收和环境负担.
需要全面利用和最大限度地减少ABN污泥.

研究的目的:

开发和验证一个综合工艺,以全面利用和最小化ABN污泥.
为了回收有价值的产品,包括元素,高纯度碳酸和硫化.
为危险ABN废物处理提供可持续的解决方案.

主要方法:

使用950°C的碳热降解来选择性减少ABN污泥的烤制.
使用硫化 (H2S) 气体的硫化 (CaS) 的化.
碳化二硫化 (Ca(HS) 2) 与二氧化碳,以沉碳酸 (CaCO3) 并释放H2S.
热力学分析和实验验证.

主要成果:

选择性降解实现了95.35%的酸盐和96.55%的石膏降解为As4 (g) 和CaS.
从凝结的As4 (g) 中回收了元素 (96.78%重量).
使用H2S的液选择性地回收了97.41%的CaS作为Ca(HS) 2,使污泥重量减少了74.11%.
碳化产生高纯度的CaCO3 (99.12重量%) 和H2S (24.89体积%) 与99.69%的Ca2+和99.12%的S2-分离.
回收的H2S可以通过克劳斯工艺转化为硫.

结论:

拟议的联合工艺有效地处理危险的ABN污泥.
实现了全面的资源回收 (,CaCO3,H2S) 和污泥最小化.
这种方法为危险ABN废物的清洁处理提供了可行的替代方案.

关键词:

亚是一种.含有的中和污泥中含有的中和污泥.危险废物危险废物高纯度的CaCO3 选择性的减少烤.

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