DBPapers
DOI: 10.5593/SGEM2014/B62/S26.055

VALORIZATION OF MINERAL WASTE WITH HEAVY METALS CONTENT INTO SILICATE MATRIX

M. Gheorghe, N. Saca, L. Radu
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 2, 423-430 pp

ABSTRACT
Article presents a study concerning the embedding of some mineral waste with heavy metal content (electroplating sludge) into solidification/stabilisation (s/s)
vitreous/vitroceramic matrix of glass products type and into cementitious matrix of
concrete products type. The leaching tests showed that the obtained materials of
vitrous, vitroceramic type and of hydraulic matrix type (based on Portland cement – PC and granulated blast-furnace slag - GBS) present no risk to the environment
contamination. Also, the mechanical strengths of cementitious matrix and concretes are influenced of the Portland cement/granulated slag ratio, waste/cement ratio and water/cement ratio. The 28 days-compressive strenghts of matrix with CP/GBS ratio from 80/20 to 20/80 varied from 80 MPa to 40 MPa. The cementitious matrix with GBS content more than 40/60 and with higher waste/cement ratio of 3/10 and 4/10 developed the lowest 28 days-compressive strengths due to a high content of Zn and Cu.

Keywords: waste, valorisation, vitreous, cementitious matrix, leaching, heavy metals