Effect of Overheating Degree on Activation Efficiency of Water-glass Containing Sandmix Hardened by Traditional Drying

• Autorzy: Stachowicz M.
• Języki publikacji: EN

Abstrakty

EN

Presented are results of a preliminary research on the possibility to use innovative operations of activating inorganic binders during a reclamation process of used sandmixes containing water-glass, hardened by traditional drying. The moulding sand to be examined was prepared of high-silica sand and the selected water-glass grade 145. Next, it was subject to mixing components, compacting, hardening by traditional drying at 100°C, thermal loading of the mould up to 800°C, cooling-down to ambient temperature, knocking-out, various kinds of mechanical dry and wet reclamation to restore bonding properties to the sandmix. For examinations, two ranges of overheating the mould were selected, determined on the grounds of final strength (R_c^tk) of the sandmixes. It was found, among others, that overheating and dedusting affect activation of a used sandmix. There is a possibility of partial restoring binding properties of the binder by its rehydration in used-up and properly processed moulding sand, provided that hardening was performed by a physical method.

Słowa kluczowe

EN

foundry engineering; moulding sand; overheating degree; reclaimed binder

PL

odlewnictwo; masa formierska; stopień przegrzania; spoiwo regenerowane

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2015
• Tom: Vol. 15, iss. 2 spec.
• Strony: 77--82
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Stachowicz M.

• Wroclaw University of Technology, Department of Foundry Engineering, Plastics and Automation, Smoluchowskiego 25, 50-372 Wrocław, Poland

Bibliografia

• [1] Stachowicz, M. & Granat, K. (2014). Possibilities of reclamation microwave-hardened molding sands with water glass. Archives of Metallurgy and Materials. 59(2), 757-760.
• [2] Stachowicz, M. (2015). Possibility of activating used-up inorganic binders on the example of sandmixes containing water-glass hardened by traditional drying. Conference „Foundry engineering. Technology – Practice – Ecology”, Karpacz, 25-27.03.2015. (in Polish).
• [3] Grabowska, B., Kaczmarska, K. & Bobrowski, A. (2012). Research on recondition of polymeric foundry bonders. Archives of Foundry Engineering. 12(spec. 1), 47-52. (in Polish).
• [4] Stachowicz, M., Granat, K. & Nowak, D. (2010). Studies on the possibility of more effective use of water glass thanks to application of selected methods of hardening. Archives of Foundry Engineering. 10(spec. 2), 135-140.
• [5] Wang, J., Fan, Z. & Zan, X. (2009). Properties of sodium silicate sand hardened by microwave heating. China Foundry. 6(03), 191-196.
• [6] Samsonowicz, Z. (1974). Reasonable hardening of waterglass containing sandmixes blown-through with carbon dioxide. Foundry Review. 24(10), 309-311. (in Polish).
• [7] Zych, J. (2005). Optimisation of mould technology based on water-glass containing sandmixes hardened with esters. Foundry Review. 12. (in Polish).
• [8] Stachowicz, M., Granat, K. & Nowak, D. (2011). Influence of water-glass grade and quantity on residual strength of microwave-hardened moulding sands. Archives of Foundry Engineering. 11(1), 93-98.
• [9] Stachowicz, M., Nowak, D., Granat, K., Haimann, K. (2009). Effect of hardening methods on structure of linking bridges in water-glass containing sandmixes. Proceedings of XXXVII School of Materials Engineering, Kraków-Krynica, 23 IX-2 X 2009 [monograph ed. by Jerzy Pacyna]. Kraków: Polygraphic Services Shop. 342-346. (in Polish).