电解锰渣蒸压砖内源硫酸盐侵蚀行为及机理研究

项目名称： 电解锰渣蒸压砖内源硫酸盐侵蚀行为及机理研究

项目编号： No.21506199

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 有机化学

项目作者： 高武斌

作者单位： 中国环境科学研究院

项目金额： 21万元

中文摘要： 为了消减电解锰渣这一电解金属锰行业产生量最大、最危险的污染源，利用其制蒸压砖是大量消纳电解锰渣的有效途径之一。但电解锰渣内含40%左右的硫酸盐对蒸压砖的长期性能存在潜在侵蚀，这种侵蚀行为极大地阻碍了电解锰渣蒸压砖的产业化应用和推广。本项目拟研究电解锰渣预处理方法、蒸压工艺以及矿物掺合料对电解锰渣中内源硫酸盐存在形态、反应产物和微观形貌的影响；在干湿循环、水溶液浸泡和实际使用工况条件下，电解锰渣蒸压砖的侵蚀状态、膨胀、质量和性能等指标的变化规律，以及侵蚀后电解锰渣蒸压砖中硫酸盐的组织结构和微观特征。运用物理化学、力学、材料科学等相关理论，采用微观和宏观相结合的测试手段，探明内源硫酸盐在电解锰渣蒸压砖中的输运过程、转化形式、物相组成和微观结构，并揭示电解锰渣蒸压砖收内源硫酸盐侵蚀破坏过程及机理，丰富建筑材料内源硫酸盐破坏的作用机理。研究成果将为电解锰渣稳定化处理与资源化利用提供理论和实验依据。

中文关键词： 硫酸盐侵蚀；内源硫酸盐；；电解锰渣；机理

英文摘要： Electrolytic manganese residues (EMR) are the largest and most dangerous pollution source of electrolytic manganese industry. One of the effective ways of realizing large utilization of EMR with high value-added is preparation for autoclaved bricks with EMR. The sulfate in EMR plays potential attack during the long-term service of autoclaved brick which hindered the industrial application and promotion of autoclaved brick produced from EMR. This project focuses sulfate attack in EMR. The factors such as pretreatment method of EMR, autoclave process and mineral admixtures will be studied, which will affect the existing form, reaction products and microstructure of sulfate in EMR. The sulfate attack state, expansive, quality and performance of autoclaved brick under the wet and dry cycle, water immersion and the actual working conditions will be discussed, and the structure and microscopic characteristics of the experimental bricks also revealed. Under the related theory such as physical chemistry, mechanics and materials science, and testing methods combining micro and macro, the correlations between the phase composition and microstructure and the sulfate attack in EMR will be analyzed, which will play an important role in the finding of sulfate attack mechanism on autoclaved brick, and also will be of great significance in extending the covering and mechanism of sulfate attack in building materials containing internal sulfate. Research results can supply theoretical guidance and experimental basis for harmless treatment and reutilization of EMR.

英文关键词： Sulfate attack;Internal sulfate;Electrolytic manganese residues;Mechanism