Mechanism of Immobilization of Toxic Elements in Special Binders

Abstract:

The paper deals with development of cementitious binders that would be able to efficiently immobilize toxic elements contained in various types of wastes. The basic component of the proposed binders are clinkers with phosphorus incorporated into the structure of clinker silicates, mixtures of cement with ash containing hydroxylapatite and belite-rich clinkers activated with sulfate anions. The prepared binders were mixed with water doped with various toxic elements; after a defined period of cement stone hydration the test beams were subjected to long-term testing of leachability of individual toxic elements. The research methods involved besides leaching tests also optical and electron microscopy.

• Periodical: Advanced Materials Research (Volume 1124)
• Pages: 3-9
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1124.3
• Online since: September 2015
• Authors: Theodor Staněk*, Petr Sulovský
• Keywords: Cementitious Binders, Immobilization, Toxic Elements

References

[1] J.L. Means, The application of solidification/stabilization to waste materials. Boca Raton, Lewis Publishers, (1995).

[2] Z. Kafka, J. Vošický, Chemical stabilization of hazardous components in industrial wastes (in Czech), Chemické listy. 92 (1998) 789-793.

[3] C. Shi, R. Spence, Designing of Cement-Based Formula for Solidification/Stabilization of Hazardous, Radioactive, and Mixed Wastes. Crit. Rev. Environ. Sci. Technol. 34 (2004) 391-417.

DOI: 10.1080/10643380490443281

[4] J. Gómez del Río, P. Sanchez, P.J. Morando, D.S. Cicerone, Retention of Cd, Zn and Co on hydroxyapatite filters, Chemosphere. 64 (2006) 1015-1020.

DOI: 10.1016/j.chemosphere.2006.02.008

[5] E.D. Vega, J.C. Pedregosa, G.E. Narda, Adsorption of oxovanadium (IV) from aqueous solutions by nanoparticulated hydroxyapatite: Thermodynamic and kinetic study, J. Argent. Chem. Soc. 97 (2009) 1-12.

[6] C. Tashiro, The effect of several heavy metal oxides on the hydration and the microstructure of hardened mortar of C3S, in: Proceedings of the 7th International Congress of Chemistry of Cement, Editions Septima, Paris, vol. 11 (1980) p.1137.

[7] T. Staněk, P. Sulovský, The influence of phosphorous pentoxide on the phase composition and formation of Portland clinker, Mater. Char. 60 (2009) 749-755.

DOI: 10.1016/j.matchar.2008.11.013

[8] T. Staněk, P. Sulovský, Dicalcium silicate doped with sulfur, Advances in Cem. Res. 24 (2012) 233-238.

DOI: 10.1680/adcr.11.00021

[9] I. Navarro-Blasco, A. Duran, R. Sirera, J.M. Fernandez, J.I. Alvarez, Solidification/stabilization of toxic metals in calcium aluminate cement matrices, J. of Hazard. Mat. 260 (2013) 89-103.

DOI: 10.1016/j.jhazmat.2013.04.048

[10] I.G. Richardson, The nature of C-S-H in hardened cements, Cem. and Concr. Res. 29 (1999) 1131-1147.

[11] D. Bhattacharyya, A.B. Jumawan, G. Sun, C. Sund-Hagelberg, K. Schwitzgebel, Precipitation of heavy Metals with Sodium Sulfide: Bench-Scale and Full-Scale Experimental Results in: Bennett, G.F. (Ed. ), Water-1980, AIChE Symposium Series, New York, vol. 209 (1981).