Abstract

TORRES-AGREDO, Janneth; NARVAEZ-LEGARDA, Alejandra; SANCHEZ-CANO, Robert  and  MOSQUERA-IDROBO, Luisa Fernanda. Vitrification process to stabilize a smelting slag: preliminary study. Ing. compet. [online]. 2022, vol.24, n.2, e20411333.  Epub May 26, 2022. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v24i2.11333.

The aim of this study is to carry out a preliminary evaluation of vitrification process, which used as a method to stabilize a secondary lead smelting slag, in order to facilitate its handling or final disposal. Vitrification consists of processing a waste at high temperatures with vitrifying agents, to obtain a product chemically stabilized, allowing the inertization of a hazardous waste. In this study, slag and a sand residue used as vitrifying were characterized, through of X-ray Fluorescence (FRX), X-ray Diffraction (DRX) and Laser granulometry, in order to determine vitrification process parameters. Experimental batches were formulated for the vitrification process with slag, sand and sodium carbonate (Na2CO3), and were processed to 1000, 1100 and 1200 °C for 2 hours. Additionally, the TCLP (Toxicity Characteristic Leaching Procedure) technique was applied in order to determine the mobility of heavy metals contained in slag and vitrified products. As a result, it was found the vitrified at 1200ºC presented more homogeneous textures, partially amorphous, although some products presented crystalline phases. It can be concluded that the vitrification process was effective for the stabilization of the slag, with 60% slag and 40% sand, such as Pb, Se, As, because it presented a significant reduction in heavy metal leaching, complying with the standard.

Keywords : lead smelting slag; solid wastes; stabilization; vitrification; waste management.

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