Ferritic calcium sulfoaluminate belite cement from metallurgical industry residues and phosphogypsum: Clinker production, scale-up, and microstructural characterisation
Ferritic calcium sulfoaluminate belite cement from metallurgical industry residues and phosphogypsum: Clinker production, scale-up, and microstructural characterisation
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DOI：
10.1016/j.cemconres.2022.106715
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发表时间：
2022-04
影响因子：
11.4
通讯作者：
Visa Isteri;K. Ohenoja;T. Hanein;H. Kinoshita;Holger Kletti;C. Rößler;P. Tanskanen;M. Illikainen;T. Fabritius
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作者：
Visa Isteri;K. Ohenoja;T. Hanein;H. Kinoshita;Holger Kletti;C. Rößler;P. Tanskanen;M. Illikainen;T. Fabritius
从钢包渣、铁渣和磷石膏中生产富铁素体硫铝酸钙贝利特(CSABF)水泥熟料，也含有镁，在1260℃的7米窑中从实验室规模转化为中试示范。介绍了中试试验/制造的情况，该过程是稳健的。放大前的实验室试验表明，在生料中加入过量的CaO可以抑制CSABF熟料中钙铝尖晶石的形成，但这会减少铁(Fe)的含量，导致铁素体(C6AF2)含量增加。对熟料进行了详细的显微结构分析，揭示了熟料的组成以及次要元素的分配。不同的铁素体相具有不同的钛和铁含量。熟料生料的85%由副产原料组成，该窑生产的熟料的化学原料二氧化碳排放量比以原始原料制成的硅酸盐水泥低90%。这些结果可能会对冶金工业蓬勃发展的地区产生重大影响，从而实现工业脱碳和资源效率。
The production of ferrite-rich calcium sulfoaluminate belite (CSABF) cement clinker, also containing MgO, from ladle slag, Fe-slag, and phosphogypsum was translated from a lab-scale to a pilot demonstration in a 7-metre kiln at 1260 °C. An account of the pilot trials/manufacturing is presented, and the process was robust. Laboratory tests prior to scale-up showed that gehlenite formation can be inhibited in the CSABF clinker by adding excess CaO in the raw meal; however, this reduces the amount of iron (Fe) that can be incorporated into ye'elimite and leads to higher ferrite (C6AF2) content. Detailed microstructural analyses were performed on the clinker to reveal the clinker composition as well as the partition of the minor elements. Different ferrite phases with varying amounts of titanium and iron are distinguished. Eighty-five percent of the clinker raw meal was comprised of side-stream materials and the clinker produced in the kiln had chemical raw-material CO2emissions 90% lower than that of Portland cement made from virgin raw materials. These results can have a significant impact in regions with a prospering metallurgical industry, enabling industrial decarbonisation and resource efficiency.