球磨活化制备高强度铜尾渣基水泥活性材料  

Preparation of high strength copper smelter slag-based cement active mixture by ball milling activation

作　　者：杜亚光 李杰[1,2] 陈荣升 吕晨阳[1,2] 郭莉 DU Yaguang;LI Jie;CHEN Rongsheng;LV Chenyang;GUO Li(College of Resources and Environmental Science&Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution,South-Central Minzu University,Wuhan 430074,China;Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,South-Central Minzu University,Wuhan 430074,China;Hubei Dajiang Environmental Technology Co.,Ltd.,Huangshi 435005,China)

机构地区：[1]中南民族大学资源与环境学院&湖北省重金属污染防治工程技术研究中心,武汉430074 [2]中南民族大学催化转化与能源材料化学教育部重点实验室,武汉430074 [3]湖北大江环保科技股份有限公司,黄石435005

出　　处：《中南民族大学学报（自然科学版）》2022年第5期547-552,共6页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：湖北省重大科技创新资助项目(2019ACA156);大江公司科研资助项目(HZY21040)。

摘　　要：以铜尾渣(CSS)为主要原料,采用球磨活化方法制备了水泥活性混合材料,探究了CaO掺量、球磨时间、球磨转速对砂浆试块抗压强度和活性指数的影响.结果表明:(1)在CaO掺量为15%,球磨时间为90 min,球磨机转速为400 r·min^(-1)条件下砂浆试块抗压强度可达38.9 MPa,活性指数为89%(>75%),均满足标准《用于水泥和混凝土中的粉煤灰》(GB/T 1596―2017)的要求;(2)球磨和CaO掺入对铜尾渣的活化具有协同作用机制,球磨可通过减少粒径及增加表面活性基团的方式显著活化铁橄榄石(Fe_(2)SiO_(4))中硅酸盐基团,CaO还可在活化颗粒表面形成大量的C―S―H活性基团而提升其抗压强度;(3)所制得的材料符合标准,材料的有害物质浸出毒性浓度均低于《危险废物鉴别标准浸出毒性鉴别标准》(GB 5085.3―2007)中的限值.因此,该法不仅降低了铜尾渣堆积造成的环境风险,还具有对铜尾渣大规模处理和资源化利用的潜力.Using copper smelting slag(CSS)as the main raw material,a cement active mixture was prepared by ball milling activation.The effect of CaO content,ball milling time,and ball milling speed on the compressive strength and activity index of mortar specimens were investigated.The results showed that(1)with a CaO dosage of 15%,ball milling time of 90 min,and ball mill speed of 400 r·min^(-1),the compressive strength and the activity index of the mortar specimen reached 38.9 MPa and 89%(>75%),respectively,both of which were above the standard for Fly Ash Used in Cement and Concrete(GB/T 1596―2017);(2)The activation of CSS by ball milling and CaO addition showed a synergistic mechanism.Ball milling significantly activated the silicate groups in iron olivine(Fe_(2)SiO_(4))by reducing the particle size and increasing the surface active groups;meanwhile,CaO improved the compressive strength of the activated particles by forming a large number of C―S―H active groups on the surface;(3)The stability of the prepared material was up to the standard,and the concentration of harmful substances leached from the admixture satisfied the requirement of Hazardous Waste and Identification Standard of Leaching Toxicity(GB 5085.3―2007).This strategy not only reduced the environmental risk caused by the heaping up of CSS,but also had the potential of large-scale treatment and resourceful utilization of CSS.

关 键 词：铜尾渣 资源化 球磨 水泥活性材料 活性指数 

分 类 号：X705[环境科学与工程—环境工程]