Exploring the potential of olivine-containing copper-nickel slag for carbon dioxide mineralization in cementitious materials  

作　　者：Qianqian Wang Zequn Yao Lijie Guo Xiaodong Shen 

机构地区：[1]College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China [2]State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing 211816,China [3]BGRIMM Technology Group,Beijing 100160,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第3期562-573,共12页矿物冶金与材料学报（英文版）

基　　金：supported by the Intergovernmental International Science and Technology Innovation Cooperation Key Project of the National Key Research and Development Program of China (No.2022YFE0135100);the National Natural Science Foundation of China (No.52072171);the Beijing Nova Program (No.20220484057);the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘　　要：Water-quenched copper-nickel metallurgical slag enriched with olivine minerals exhibits promising potential for the production of CO_(2)-mineralized cementitious materials.In this work,copper-nickel slag-based cementitious material(CNCM)was synthesized by using different chemical activation methods to enhance its hydration reactivity and CO_(2) mineralization capacity.Different water curing ages and carbonation conditions were explored related to their carbonation and mechanical properties development.Meanwhile,thermogravimetry differential scanning calorimetry and X-ray diffraction methods were applied to evaluate the CO_(2) adsorption amount and carbonation products of CNCM.Microstructure development of carbonated CNCM blocks was examined by backscattered electron imaging(BSE)with energy-dispersive X-ray spectrometry.Results showed that among the studied samples,the CNCM sample that was subjected to water curing for 3 d exhibited the highest CO_(2) sequestration amount of 8.51wt%at 80℃and 72 h while presenting the compressive strength of 39.07 MPa.This result indicated that 1 t of this CNCM can sequester 85.1 kg of CO_(2) and exhibit high compressive strength.Although the addition of citric acid did not improve strength development,it was beneficial to increase the CO_(2) diffusion and adsorption amount under the same carbonation conditions from BSE results.This work provides guidance for synthesizing CO_(2)-mineralized cementitious materials using large amounts of metallurgical slags containing olivine minerals.

关 键 词：copper-nickel slag FAYALITE CO_(2)sequestration cementitious material ADMIXTURES carbonation conditions 

分 类 号：TQ177[化学工程—硅酸盐工业]