利用电解锰渣制备陶瓷骨料及在混凝土中的应用

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中文摘要：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CaSO4,CaSO4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.

外文标题：Preparation of ceramic aggregate from electrolytic manganese slag and its application in concrete

外文摘要：It is well known that the stacking of electrolytic manganese slag threatens people's health and the ecological envi-ronment,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 contain-ing 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 classi-fying.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 CaSO4,the presence of CaSO4 promoted the synthesis of calcium vanadite,the hydra-tion 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 natu-ral sand fine aggregate was 7.54 MPa,which was better than that of the sample with both coarse aggregate and fine aggre-gate 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.

外文关键词：

electrolytic manganese slagceramic aggregateCaSO4solid wasteresource utilizationconcrete

作者：

叶芬、成昊、向媛、刘松、石维

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作者单位：

铜仁学院材料与化学工程学院,贵州铜仁 554300

关键词：

电解锰渣陶瓷骨料 CaSO4 固体废弃物资源化利用混凝土

基金：

贵州省锰系新型功能材料协同创新中心项目贵州省教育厅青年科技人才成长项目贵州省高等学校水污染控制工程研究中心项目贵州省教育厅青年科技人才成长项目

项目编号：

黔教技[2022]003黔教技[2022]357黔教技[2022]055黔教合KY字[2018]347

出版年：

2024

DOI：

10.19964/j.issn.1006-4990.2023-0489

无机盐工业

中海油天津化工研究设计院　中国化工学会无机酸碱盐专业委员会

无机盐工业

CSTPCD北大核心

影响因子：0.489

ISSN：1006-4990

年,卷(期)：2024.56(6)

参考文献量15