Vitrification process to solidify/stabilize a smelting slag: preliminary study
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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 disposal. Vitrification consists of processing a waste at high temperatures with vitrifying agents, to obtain a product chemically stabilized, to inertize a hazardous waste. In this study, slag and a sand residue 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, because it presented a significant reduction in heavy metal leaching, complying with the standard. Further research is suggested to modify temperatures and vitrifying agents.
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Accepted 2021-08-26
Published 2022-05-26
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