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烟气脱硫石膏与冶炼行业石膏渣综合利用研究进展

发布时间:2022-04-19收藏本文关闭本文

潘祖超,焦芬*,覃文庆,张添富,阮博文

(中南大学资源加工与生物工程学院,长沙 410083)

 

燃煤电厂烟气脱硫过程和冶炼污酸的中和过程均产生以二水硫酸钙为主要成分的固体废物,前者被称为烟气脱硫石膏,后者通常被称为石膏渣。烟气脱硫石膏在建筑材料、生产化工原料、固定二氧化碳、环境治理等方面得到了有益的应用,但冶金行业石膏渣因含有砷、铜、铅、铬等有害元素而利用困难,通常其处置方法有固化/稳定化处置、高温熔融处置、回收有价金属和作为熔剂造渣等。结合国内外烟气脱硫石膏及冶炼石膏渣综合处置的最新研究成果,全面阐述两者的综合利用现状。分析了两类石膏渣处置与利用技术的优缺点,探讨了应用中存在的一些问题与不足,并提出了建议与展望。未来烟气脱硫石膏的研究重点是减量化、高值化,扩大脱硫石膏高值化利用规模为主,以开发高附加值产品为辅提高综合利用率;冶炼行业石膏渣的无害化、资源化利用技术,如污酸中和过程硫酸钙晶型调控、火法-湿法协同处理以及熔炼造渣等是未来的发展方向。

 关键字烟气脱硫石膏;石膏渣;污酸中和渣;中和污泥;无害化处置;综合利用

 

Research progress on comprehensive utilization of flue gas desulfurization gypsum and gypsum slag in smelting industry

PAN Zu-chao, JIAO Fen, QIN Wen-qing, ZHANG Tian-fu, RUAN Bo-wen

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:The Flue gas desulfurization process of coal-fired power plants and the neutralization process of smelting acid wastewater are accompanied by the generation of solid waste with calcium sulfate dihydrate as the main component. The former is called flue gas desulfurization gypsum (FGDG), while the latter is usually called gypsum slag. FGDG has been used in many ways such as building materials, production of chemical raw materials, environmental treatment, and soil remediation. It is difficult to use gypsum slag because it contains arsenic, copper, lead, chromium, and other harmful elements. The usual treatment methods are solidification/stabilization treatment, high temperature melting treatment, recovery of valuable metals, and slagging agent.This paper analyzes the advantages and disadvantages of disposal and utilization technology, discusses some problems and deficiencies existing in the application, and puts forward some suggestions.The future research should focus on FGDG minimization, expanding the high value utilization scale, and developing high value-added products to improve the comprehensive utilization rate. The technologies of harmless and resource utilization of gypsum slag, such as calcium sulfate crystal regulation, pyrometallurgical-wet synergistic treatment,and using as slagging agent are the future development directions.

 

Key words: Flue gas desulfurization gypsum; Gypsum slag; Sewage acid neutralizing residue; Neutralization sludge; Harmless disposal; Comprehensive utilization

(资料来源:中国有色金属学报)