摘要
电解锰渣的堆放威胁着人们健康和生态环境,因此电解锰渣的无害化处理成为亟需解决的难题。利用1 100℃高温烧结使电解锰渣中可溶的Mn和Cr固化在晶粒内,同时热分解含氨复盐。高温烧结后的电解锰渣已经瓷化且拥有较高的抗压强度,经过破碎分级后可替代混凝土中的骨料。研究结果表明,电解锰渣陶瓷粗骨料和细骨料能基本满足GB/T 25177—2010《混凝土用再生粗骨料》,由XRD和EDS分析可知,烧结后的电解锰渣含有一定量的CaSO_(4),CaSO_(4)的存在促进了水泥水化产物钙钒石的合成,使陶瓷骨料与水泥结合更加紧密,混凝土试块在断裂时陶瓷骨料不以拔出的形式失效,增加了混凝土试块力学的强度。利用陶瓷粗骨料和天然砂细骨料制备的混凝土试块14 d抗折强度为7.54 MPa,优于粗骨料和细骨料均为天然砂石的样品(5.36 MPa),且陶瓷粗骨料在混凝土中所含质量分数较大(48.55%),对于电解锰渣再利用具有重要意义。
It is well known that the stacking of electrolytic manganese slag threatens people's health and the ecological environment,so the harmless treatment of electrolytic manganese residue becomes an urgent problem to be solved.The soluble Mn and Cr in electrolytic manganese slag were solidified in the grain by sintering at 1 100 ℃,and the ompound salt containing ammonia were thermal decomposed at same time.The electrolytic manganese slag after sintering at high temperature had been porcelain and had high compressive strength,which could replace the aggregate in concrete after breaking and classifying.The results showed that the coarse aggregate and fine aggregate of electrolytic manganese slag ceramic could meet the standard of “recycled coarse aggregate for cement”.XRD and EDS analysis showed that electrolytic manganese slag after sintering contained a certain amount of CaSO_(4),the presence of CaSO_(4) promoted the synthesis of calcium vanadite,the hydration product of cement,so that the ceramic aggregate and cement were more closely combined,and the ceramic aggregate did not fail in the form of pulling out when the concrete test block was broken,and the mechanical strength of the concrete test block was increased.The 14 d flexural strength of the concrete sample prepared with ceramic coarse aggregate and natural sand fine aggregate was 7.54 MPa,which was better than that of the sample with both coarse aggregate and fine aggregate as natural sand and stone(5.36 MPa).The coarse ceramic aggregate accounted for 48.55% in concrete,and the amount was large.This study was of great significance for the resource utilization of electrolytic manganese slag.
作者
叶芬
成昊
向媛
刘松
石维
YE Fen;CHENG Hao;XIANG Yuan;LIU Song;SHI Wei(College of Material and Chemical Engineering,Tongren University,Tongren 554300,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2024年第6期127-132,共6页
Inorganic Chemicals Industry
基金
贵州省锰系新型功能材料协同创新中心项目(黔教技[2022]003)
贵州省教育厅青年科技人才成长项目(黔教技[2022]357)
贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]347)
贵州省高等学校水污染控制工程研究中心项目(黔教技[2022]055)。
