Influence of P₂O₅ and Al₂O₃ on Mineral Formation in Converter Slag

Abstract:

Converter Slag is a by-product during steelmaking. Reusing the slag as Portland cement material can be regarded as a way to reduce environmental pollution. However, the poor grindability caused by complex chemical composition of the slag makes it very difficult to be used in cement industry. To better understand its grindability, the mineral characteristic of converter slag was investigated in this paper. Experimetal slags of CaO-MgO-SiO₂-Fe₂O₃, CaO-MgO-SiO₂-Fe₂O₃-P₂O₅ and CaO-MgO-SiO₂- Fe₂O₃-P₂O₅-Al₂O₃ were synthetized according to physical and chemical properties of actual converter slag. The mineral structures of these slags were analyzed by SEM and EDS. The results show that actual and synthetic slags have mainly three mineral, where dicalcium silicate with little phosphorus presented dark gray, periclase presented black and the matrix phase of dicalcium ferrite. Moreover, phosphorus largely dissolves in the 2CaO∙SiO₂ in the form of 3CaO∙PO₄, and the other minerals don’t contain phosphorus. A Little aluminum has a little influence on the mineral formation of the slag.

• Periodical: Applied Mechanics and Materials (Volumes 477-478)
• Pages: 1273-1277
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.477-478.1273
• Online since: December 2013
• Authors: Zhi Hao Deng
• Keywords: Aluminoferrite, Converter Slag, Dicalcium Silicate, Mineral Phase

References

[1] Worldsteel. Steelstatistical yearbook. Brussels: Worldsteel Committee on Economic Studies, (2010), pp.1-122.

[2] Mahieux P. Y. , Aubert J. E. , Escadeillas G.: Construction Build Material, Vol. 23 (2008), pp.742-747.

[3] World crude steel production in 2011 on http: /wenku. baidu. com/view/e3492057772-32f60ddcca- 122. html.

[4] The bulk of industrial solid waste comprehensive utilization of the "12th Five-Year Plan on http: /www. miit. gov. cn/n11293472/n11293832/n11293907/n113682-23/14416612. html.

[5] T.S. SU. Maanshan: The seventh session of national college of metallurgy and metallurgical science High-end forum, (2012).

[6] Z.H. Xie. Iron and steel scrap recycling. China's Circular Economy Yearbook, (2010).

[7] H.G. van Oss: US Geological Survey Minerals Yearbook, http: /minerals. usgs. gov/minerals/-pubs /commodity/iron_&_steel_slag/myb1-2010-fesla. pdf.

[8] Q. Jin, J.Y. Xu, W. B. Gao: Bao-steel Technology, Vol. 3 (2005), pp.12-15, 22.

[9] X.F. Wang, S. J. Yu, H. Y. Hou, ed al: Anshan Iron and Steel Technology, Vol. 3 (2009), pp.11-14.

[10] X.S. Lin, W.C. Chen, et al: Materials Research and Application, Vol. 3 (2010), pp.561-563.

[11] K.X. Yu, Z. Zhou, Y. S. Song: Metal Mine, Vol. 3 (2010), pp.175-177, 182.