Hydration and carbonation curing of high ferrite clinker(FePC)synthesized using EAF slag  

作　　者：Elijah Adesanya Visa Isteri Aniruddha Baral Christiane Rößler Theodore Hanein Juho Yliniemi 

机构地区：[1]Faculty of Technology,Fiber and Particle Engineering Research Unit,University of Oulu,PO Box 4300,90014 Oulu,Finland [2]Faculty of Technology,University of Oulu,Process Metallurgy,90014 Oulo,Finland [3]School of Civil Engineering,University of Leeds,Leeds LS29JT,UK [4]F.A.Finger-Institute for Building Material Science,Bauhaus-Universität Weimar,Weimar,Thüringen,Germany

出　　处：《Low-carbon Materials and Green Construction》2024年第1期136-153,共18页低碳材料与绿色建造(英文)

基　　金：supported by Advanced Steels for the Green Planet-project funded by the Jane and Aatos Erkko and the Tiina and Antti Herlin foundations.Yliniemi would like to acknowledge Academy of Finland(grant number 354263);funded by Business Finland project“Towards Fossil-free Steel 2-FFS 2(5534/31/2023)”;funded by the UKRI Future Leaders Fellowship(MR/V023829/1);EPSRC project EP/W018810/1,“Developing iron-rich cement clinker&understanding ferrite for the valorisation&upcycling of steel slags(FeRICH)”;supported by the UKRI ISCF Industrial Decarbonisation Challenge,through the UK Industrial Decarbonisation Research and Innovation Centre(IDRIC)award number:EP/V027050/1,under the Industrial Decarbonisation Challenge(IDC).

摘　　要：This study explores the use of Electric Arc Furnace(EAF)slag as a sustainable alternative raw material in cement clinker production.The research demonstrates the synthesis of ferrite-rich clinker using EAF slag,achieving a clinker composition of 47%alite,32%ferrite,and 20%belite while replacing 20%of clinker raw materials i.e.limestone,iron and silica source.The hydration behavior and influence of carbonation curing on the reactivity of the ferrite phase were assessed.Results show that the addition of 5%gypsum to the clinker enhanced the hydration rate of alite and ferrite phases,promoting the formation of portlandite,C-S-H and ettringite as the major hydration phases.Typical of ferrite-rich cement,Fe/Al-rich siliceous hydrogarnet was also identified as secondary hydration products of the ferrite phase,formed as a result of the reaction of katoite(formed from ferrite dissolution)with dissolved silica.However,prolonged carbonation exposure led to a decrease in the formation of the hydrogarnet and the decomposition of ettringite,but the mortar’s strength increased with increasing calcium carbonate formation.本研究探讨了电炉渣作为可替代原材料用于制备硅酸盐水泥熟料的可行性。结果表明,使用电炉渣替代20%的传统原料(如石灰石、含铁和硅原料)合成了高铁相熟料,其中硅酸三钙47%、铁相32%、硅酸二钙20%。本研究还分析了铁相的水化与碳化养护对其反应活性的影响。结果表明,在熟料中添加5%的石膏提高了硅酸三钙和铁相的水化速率,促进了氢氧化钙、C-S-H和钙矾石等主要水化产物的生成。作为富铁相水泥的典型特征,富铁/铝硅质水榴石为铁相的二次水化产物,由水钙铝榴石(铁相溶解形成)与溶解的二氧化硅反应形成。然而,延长碳化时间会减少水榴石的生成和钙矾石的分解,但砂浆强度能够随着碳酸钙含量的提高而增强。

关 键 词：BROWNMILLERITE Steel slag CARBONATION Low-carbon cement EAF slag 

分 类 号：TG1[金属学及工艺—金属学]