CIESC Journal ›› 2021, Vol. 72 ›› Issue (2): 1107-1115.DOI: 10.11949/0438-1157.20201263

• Energy and environmental engineering • Previous Articles     Next Articles

Properties analysis of dry-process calcium carbide slag and study on acetylene gas escape behavior

MU Xiujuan1(),ZHU Ganyu2(),YAN Kun2,ZHAO Liwen3,LI Shaopeng2,LI Huiquan2,4,SUN Guoxin1()   

  1. 1.School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China
    2.CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    3.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    4.School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-09-04 Revised:2020-11-02 Online:2021-02-05 Published:2021-02-05
  • Contact: ZHU Ganyu,SUN Guoxin

干法电石渣性质分析及乙炔气逸出行为研究

牟秀娟1(),朱干宇2(),颜坤2,赵立文3,李少鹏2,李会泉2,4,孙国新1()   

  1. 1.济南大学化学化工学院,山东 济南 250022
    2.中国科学院过程工程研究所绿色过程与工程重点实验室,湿法冶金清洁 生产技术国家工程实验室,北京 100190
    3.昆明理工大学冶金与能源工程学院,云南 昆明 650093
    4.中国科学院大学化学工程学院,北京 100049
  • 通讯作者: 朱干宇,孙国新
  • 作者简介:牟秀娟(1996—),女,硕士研究生,xjmou@ipe.ac.cn
  • 基金资助:
    国家重点研发计划项目(2018YFC1901502);中国科学院绿色过程制造创新研究院自主部署项目(IAGM-2019-A09);中国科学院青年创新促进会(2018066)

Abstract:

Dry-process calcium carbide slag is a large amount of calcium-based solid waste produced in the process of making acetylene by the calcium carbide process, in which residual calcium carbide and acetylene gas have a greater impact on resource utilization. Focusing on the hidden safety problem caused by the acetylene gathering, the physical and chemical properties of dry calcium carbide slag were analyzed. The changes of residual calcium carbide content and the influences of different temperature, humidity, vibration, open time, gas replacement and other factors on the escape behavior of acetylene gas were investigated. The results show that the main component of calcium carbide slag is calcium hydroxide, and the particle size is concentrated below 75 μm. The morphology of the slag is polyhedral and loose sheet-like. The residual amount of calcium carbide in the slag fluctuates from 0 to 0.71%. The increase of temperature and moisture can promote the escape of acetylene gas from calcium carbide slag. Vibration has no obvious promotion or suppression effect, moreover, most acetylene can escape from calcium carbide slag with the combination of hanging and air replacement. Through this method, the explosion risk caused by the gathering of acetylene gas can be effectively reduced. The research can provide a reference for the storage, transportation and utilization of calcium carbide slag in the industrial production process.

Key words: calcium carbide slag, acetylene gas, waste treatment, diffusion, equilibrium

摘要:

干法电石渣是电石法制乙炔过程中产生的大宗钙基固废,其中残留电石及乙炔气对资源化利用影响较大。针对利用过程乙炔气富集的安全隐患问题,对电石渣的粒径分布、矿相组成、微观形貌等进行了系统分析和表征,考察了残留电石含量变化及不同温度、湿度、振荡、晾置时间、气体置换等因素对乙炔气逸出行为影响。结果表明:干法电石渣主要物相是Ca(OH)2,以多面体片状疏松结构存在,粒度集中分布在75 μm以下,电石残余量0~0.71%;温度升高及水分含量增加促进电石渣内乙炔气的逸出,振荡无明显促进或抑制作用;采用预先晾置与气体置换相结合的方式能够使得电石渣内乙炔气得以大量逸散,有效降低乙炔气富集燃爆风险,本工作可为干法电石渣的安全运输和利用提供依据。

关键词: 干法电石渣, 乙炔气, 废物处理, 扩散, 平衡

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