摘要
我国电炉镍铁渣(FNS)产出较多,该渣具有一定碱水化活性,可作为辅助胶凝材料;高炉渣(GGBS)具有优良的水化胶凝活性,是性能最佳的辅助胶凝材料之一。为了最大资源化利用镍铁渣,本文采用在高炉渣中掺入镍铁渣的方式制备活性复合微粉,并考察了其活化性能和力学性能等指标,得到以下主要结论。增加镍铁渣粉比表面积,能够提高镍铁渣-水泥砂浆试件力学强度,但会降低韧性;当镍铁渣在复合微粉中占比低于20%时,能够达到S105级矿渣微粉活性要求;占比为20%~40%时,能够达到S95级活性要求;掺入镍铁渣能够降低易磨性,故混配成复合微粉之前,镍铁渣需预磨至一定细度;掺入镍铁渣后能导致砂浆早期强度损失,但随龄期增加镍铁渣水化活性逐渐显现;当微粉比表面积为410~432 m^(2)/kg时,活性可达到Ⅱ级复合掺合料标准,比表面积增至519 m^(2)/kg,活性可达到Ⅰ级标准;镍铁渣价格低于高炉渣,掺入镍铁渣能降低复合微粉生产成本,但掺加比例不宜超过20%,此时成本可降低约10%,同时具有较好的技术经济性。
China produces a large amount of electric furnace Ferronickel iron slag(FNS),which has certain alkaline hydration activity and can be used as an auxiliary cementitious material.Ground granulated furnace slag(GGBS)has excellent hydration cementitious activity and is one of the best performing auxiliary cementitious materials.In order to maximize the utilization of FNS,this paper prepared active composite micro powder(CMP)by adding FNS into GGBS,and investigated its activation performance and mechanical properties.The main conclusions are as follows.Increasing the specific surface area of FNS can improve the mechanical strength of FNS-cement mortar specimens,but it will reduce toughness.When the proportion of FNS in the CMP is less than 20%,the CMP can meet the activity requirements of grade S105 GGBS.When the proportion is between 20%and 40%,it can meet the S95 level.The addition of FNS can reduce the grindability,so before mixing into CMP,the FNS needs to be pre-ground to a certain fineness.The addition of FNS can lead to early strength loss of mortar,but the its hydration activity gradually becomes apparent with increasing curing age.When the specific surface area of the CMP is between 410 and 432 m^(2)/kg,the activity can reach the level II composite admixture standard;when the specific surface area increases to 519 m ^(2)/kg,the activity can reach the level I standard.The price of FNS is lower than that of GGBS,and adding FNS can reduce the production cost of CMP,but the proportion of addition should not exceed 20%.At this time,the cost can be reduced by about 10%,and it has good technical and economic efficiency.
作者
代文彬
陈曦
陈奎元
樊亚鑫
陈学刚
DAI Wenbin;CHEN Xi;CHEN Kuiyuan;FAN Yaxin;CHEN Xuegang(China ENFI Engineering Corporation,Beijing 100038,China)
出处
《中国有色冶金》
北大核心
2025年第2期135-142,共8页
China Nonferrous Metallurgy
基金
五矿科创基金(YG2302)。
关键词
镍铁渣
高炉渣
复合微粉
力学性能
建筑材料
ferronickel slag
blast furnace slag
admixture
mechanical properties
building materials
