不同酸浸过程电石渣中杂质离子随Ca2+浸出特性
Leaching characteristics of impurity ions with Ca2+in calcium carbide slag during different acid leaching processes
晋鹤宁 1张鹏云 2张亚斌 1郭彦霞1
作者信息
- 1. 山西大学环境与资源学院CO2减排与资源化利用教育部工程研究中心,山西太原 030006
- 2. 山西石器时代新材料科技有限公司,山西吕梁 033000
- 折叠
摘要
PVC、乙烯等工业生产过程产生的电石渣大量堆存造成严重的环境污染和资源浪费.电石渣酸浸提钙是制备纳米碳酸钙等钙基高附加值化学品的前置技术,但酸浸过程不可避免造成电石渣中杂质离子的浸出,严重影响Ca2+的纯度.为了降低杂质离子的浸出,对比HC1和NH4C1两种浸取剂体系,利用单因素试验、正交试验和各种表征研究氯钙物质的量比、温度、搅拌速率和搅拌时间等不同浸取条件对Ca2+及Al3+、Mg2+和Fe3+杂质离子浸出的影响规律.结果发现:HC1浸取体系Ca2+转化率高于NH4C1体系,浸取条件对Ca2+转化率的影响程度为氯钙物质的量比＞时间＞温度＞搅拌速率;浸取剂用量是2种浸取剂体系杂质离子浸出最大的影响因素,其他因素影响相对较小.此外,HC1浸取体系杂质离子浸出量和浸出速度远高于NH4C1体系,HC1浸取体系可将Al3+、Mg2+和Fe3+浸出,而NH4C1体系仅可浸出Al3+和Mg2+,并且其质量浓度远低于HC1体系.
Abstract
The industrial processes of PVC,ethylene,and so on produced a significant amount of calcium carbide slag,leading to severe environmental issues and resource wastage.Acid leaching is a pre-treatment technique employed for extracting calcium from calcium carbide slag to produce high-value calcium-based chemicals like nano-calcium carbonate.However,impurity ions present in the slag are inevitably leached during this process,adversely affecting the purity of Ca2+.In the present study,HC1 and NH4C1 leaching systems were compared and the effect of various leaching conditions(molar ratio,temperature,agitation rate and time)on the leaching efficiencies of calcium and impurity ions(Al3+,Mg2+and Fe3+)was investigated.One-way experiments,orthogonal experiments,and analysis using different characteristics were conducted.The findings revealed that the conversion rate of Ca2+was higher in the HC1 system compared to the NH4C1 system.Amongst different leaching conditions studied here,molar ratio had the most significant influence on Ca2+conversion rate followed by time＞temperature＞stirring rate.Leaching agent dosage emerged as the most influential factor affecting ion leaching in both systems while other factors exhibited small or even negligible effects.The HCl leaching system can leach Al3+,Mg2+and Fe3+,while the NH4C1 system can only leach Al3+and Mg2+,and its concentration is much lower than the HC1 system.
关键词
电石渣/酸浸/杂质离子/转化率/单因素试验/正交试验/动力学Key words
carbide slag/acid leaching/impurity ion/conversion rate/single factor test/orthogonal experiment/dynamics引用本文复制引用
出版年
2024
NETL
NSTL
万方数据