大掺量电解锰渣制备生态型低强度水泥基材料  

Preparation of ecological cement-based materials with low strength by mixing large amount of electrolytic manganese residue

作　　者：白敏 龙广成[1] BAI Min;LONG Guangcheng(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《新型建筑材料》2023年第6期55-60,共6页New Building Materials

基　　金：湖南省重点领域研发计划项目(2020WK2005)。

摘　　要：基于大掺量电解锰渣制备生态型水泥基材料,为电解锰渣的消纳提供一种方案。探讨电解锰渣低耗、无害化预处理后的性能变化,并开展预处理后电解锰渣水泥砂浆力学性能和耐水性能的研究,分析相应经济性及环境影响。结果表明:经石灰及球磨处理后的电解锰渣粒径变小,并使电解锰渣中的(NH4)2SO4发生物相转变形成石膏相。Mn2+和NH4+—N的去除率分别达到了98.69%和96.46%,实现了电解锰渣的无害化处理。当电解锰渣掺量达70%,胶砂比为1∶2时,制备的水泥基材料力学性能和耐水性能良好。相较于纯水泥制备M15砂浆,掺电解锰渣的水泥砂浆可降低成本17.6%,温室气体排放减少36.8%,实现电解锰渣废弃物的高效低碳利用。In this paper,ecological cement-based materials were prepared based on a large amount of EMR to provide a potential scheme for accelerating the digestion of EMR.Firstly,the performance change from low consumption and harmless pretreatment of EMR was discussed.Then the mechanical properties and water resistance of cement mortar pretreated with EMR were studied.Finally,the corresponding economic and environmental effects were analyzed.The results show that the particle size of EMR becomes smaller after lime and ball milling,and the phase of(NH_(4))_(2)SO_(4) in EMR transforms into gypsum phase.The removal rates of Mn^(2+)and NH_(4)^(+)—N reached 98.69% and 96.46%,realizing the harmless treatment of EMR.When the content of EMR reaches 70% and the cement-sand ratio is 1∶2,the mechanical properties and durability of cement-based materials are good.Compared with M15 mortar prepared with pure cement,EMR-cement mortar can achieve 17.6%economic saving and 36.8% greenhouse gas emission reduction.The research results can provide important technical support for the application of EMR in roadbed reinforcement and road cement stabilization base,and realize the efficient and low-carbon utilization of EMR waste.

关 键 词：电解锰渣废弃物 水泥基材料 强度 耐水性 温室气体排放 

分 类 号：TU578.1[建筑科学—建筑技术科学]