通过水洗过程对化污泥脱盐特性进行研究
Yane Xu1,2, Likui Xu1, Jie Yuan1,2
1School of Chemistry and Materials Engineering, Liupanshui Normal University Guizhou 553004 PR China YaneXu1986@126.com may_kmust11@163.com.
RSC advances
|January 4, 2024
概括
洗水有效地从钢铁盐酸泥 (SHPS) 中去除盐,使有价值的金属可回收. 优化条件实现了高化物清除率,促进了危险废物的资源利用.
科学领域:
- 环境科学与工程环境科学与工程
- 材料科学与工程 材料科学与工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 钢铁盐酸泥 (SHPS) 是一种危险的固体废物,富含有价值金属 (Fe,Zn,Ni),但高含盐.
- 降低化物含量对于有效利用资源和回收SHPS的贵金属至关重要.
- 高化物水平会对随后的金属提取和炼过程产生负面影响.
研究的目的:
- 调查洗水参数对SHPS化物清除效率的影响.
- 为了确定SHPS脱的最佳参数.
- 分析洗对SHPS微观形态和晶相组成的影响.
主要方法:
- 研究的洗水参数:液体/固体 (L/S) 比率,SHPS颗粒大小,洗时间和洗频率.
- 通过实验确定最佳的洗条件.
- 使用扫描电子显微镜 (SEM) 和X射线衍射 (XRD) 在洗前和洗后分析SHPS.
主要成果:
- 优化条件 (室温,L/S比3: 1,100网状颗粒大小,10分钟洗,重复2-3次) 实现了Cl (96.64-99.68%),Na (97.38-99.89%) 和其他元素的高去除率.
- 过器残留物 (FR) 符合Cl,K和Na的监管标准,而Fe,Zn,Mn和Ni的含量是富含的.
- SEM显示了FR粒子大小的减少;XRD证实了显著的化物减少和矿物成分的变化 (例如,Al2O3的出现,CaCO3,Fe2O3,SiO2的增加).
结论:
- 水洗是一种有效的脱SHPS的方法,显著提高其适用于资源利用的适用性.
- 优化的洗过程有助于从危险污泥中回收Fe,Zn和Ni等贵金属.
- 脱增强了SHPS回收的经济可行性和环境友好性.
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