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
投稿时间:2022-04-16  修订日期:2022-04-27
DOI:
中文关键词: 铜尾渣  资源化  球磨  水泥活性材料  活性指数
英文关键词: copper smelting slag  resource utilization  ball milling  cement active mixture  activity index
基金项目:湖北省重大科技创新项目(2019ACA156),大江公司科研项目的支持(HZY21040)
作者单位
杜亚光 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 
李杰 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 
陈荣生 湖北大江环保科技股份有限公司 
吕晨阳 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 
郭莉 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 
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中文摘要:
      采用球磨活化后铜尾渣(CSS)为主要原料制备水泥活性材料,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:在CaO掺量为15%,球磨时间为90min,球磨机转速为400r/min条件下砂浆试块抗压强度可达38.9MPa,活性指数为89%(>75%),满足标准《用于水泥和混凝土中的粉煤灰》(GB/T 1596-2017)的要求;球磨和CaO对铜尾渣的活化具有协同作用机制:一方面,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(Fe2SiO4)中硅酸盐基团;另一方面,CaO可在活化后制成胶砂试块表面形成大量的C-S-H活性基团而显著提升其抗压强度;另外,所制得的水泥活性材料安定性合格,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,采用经球磨活化后的铜尾渣来制备水泥活性材料不仅能减轻铜尾渣堆积造成的环境风险,还可以实现尾渣的资源化利用。
英文摘要:
      Copper smelting slag (CSS) after ball milling activation was used as the main raw material to prepare cementitious active materials, and the effect of CaO doping, ball milling time, and ball milling speed on the compressive strength and activity index of mortar specimens were investigated. The results showed that the compressive strength of the mortar specimen could reach 38.9 MPa and the activity index was 89% (>75%) under the conditions of CaO dosing of 15%, ball milling time of 90 min, and ball mill speed of 400 r/min, which satisfied the requirements of the standard of "Fly Ash Used in Cement and Concrete" (GB/T 1596-2017); The activation of CSS by ball milling and CaO has a synergistic mechanism. On the one hand, ball milling can significantly activate the silicate groups in iron olivine (Fe2SiO4) by reducing the particle size and increasing the surface active groups. On the other hand, CaO can significantly improve the compressive strength of the activated particles by forming a large number of C-S-H active groups on the surface. In addition, The stability of the prepared cement active material is qualified, and the leaching toxicity concentration of harmful substances of the material is lower than the limit value in the identification standard of hazardous waste and identification standard of leaching toxicity (GB 5085.3-2007). Therefore, the preparation of cement active material with copper tailings activated by ball milling can not only reduce the environmental risk caused by the accumulation of copper tailings, but also realize the resource utilization of tailings.
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