无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (2): 92-98.doi: 10.19964/j.issn.1006-4990.2022-0164

• 环境·健康·安全 • 上一篇    下一篇

电石渣湿法脱硫中结晶产物的影响因素研究

杨凤玲1,2(),翟敏1,2,任磊1,2,张圆圆1,2,程芳琴1,2,董宏育3   

  1. 1.山西大学资源与环境工程研究所煤矸石资源高效利用技术国家环境保护重点实验室, 山西 太原 030006
    2.山西大学固废综合利用长治襄垣研发基地, 山西 长治 046000
    3.襄垣县诚丰热力有限公司, 山西 长治 046000
  • 收稿日期:2022-04-06 出版日期:2023-02-10 发布日期:2023-02-16
  • 作者简介:杨凤玲(1964— ),女,教授级高级工程师;E-mail:yangfl@sxu.edu.cn
  • 基金资助:
    国家重点研发计划(2020YFB0606201);国家自然科学基金青年科学基金项目(21908138);襄垣县固废综合利用科技攻关项目(2018XYSDCY-02);山西省高等学校科技创新项目(2020L0008)

Influencing factors of crystallization products in wet desulfurization of carbide slag

YANG Fengling1,2(),ZHAI Min1,2,REN Lei1,2,ZHANG Yuanyuan1,2,CHENG Fangqin1,2,DONG Hongyu3   

  1. 1. National Environmental Protection Key Laboratory of Coal Gangue Resource Efficient Utilization Technology,Institute of Resource and Environmental Engineering,Taiyuan 030006,China
    2. Shanxi University solid waste comprehensive utilization Changzhi Xiangyuan R&D base,Changzhi 046000,China
    3. Xiangyuan County Cheng Feng Thermal Power Generation Co. ,Ltd. ,Changzhi 046000,China
  • Received:2022-04-06 Published:2023-02-10 Online:2023-02-16

摘要:

电石渣湿法脱硫中结晶产物的品质直接影响后续脱硫石膏的资源化利用。基于此,系统研究了pH、氧化时间和电石渣粒径对电石渣湿法脱硫中结晶产物含水率、亚硫酸盐含量、矿相组成和微观形貌的影响。结果表明,较高pH会限制亚硫酸钙与溶解氧的接触,当pH在4.00~4.50时亚硫酸钙的氧化效果较好;初始阶段氧化速率受时间影响显著,6 h后氧化速率趋于平稳;电石渣粒径过大会导致比表面积减小,降低亚硫酸钙与溶解氧的接触面积,粒径过小则在生成亚硫酸钙时容易发生静电团聚现象,导致粒径增大、氧化率降低。因此,当电石渣粒径为75.00~93.75 μm、pH为4.0、氧化时间为6 h时,结晶产物(二水合硫酸钙)的结晶效果最好。

关键词: 电石渣, 湿法脱硫, pH, 氧化时间, 粒径

Abstract:

The quality of crystalline products in the wet desulfurization of carbide slag directly affects the subsequent resource utilization of desulfurization gypsum.In this work,the effects of pH,oxidation time and calcium carbide slag particle size on the water content,sulfite content,mineral phase composition,and microscopic morphology of crystalline products in calcium carbide slag wet desulfurization were systematically investigated.The results showed that high pH limited the contact between CaSO3 and dissolved oxygen.The pH was 4.00~4.50,the oxidation effect of CaSO3 was the best.In the initial stage,the oxidation rate was significantly influenced by time and the oxidation rate was leveled after 6 h.Too large particle size of calcium carbide slag was led to the surface area decreased,which reduced the contact area between CaSO3 and dissolved oxygen,and too small particle size was prone to electrostatic agglomeration when generating CaSO3,resulting in larger particle size and lower oxidation rate.Therefore,when the particle size of carbide slag is 75.00~93.75 μm,the pH is 4.0 and the oxidation time is 6 h,the crystallization effect of the product(calcium sulfate dihydrate) is the best.

Key words: calcium carbide slag, wet desulfurization, pH, oxidation time, particle size

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