EARTH

[31001-12-08] Utilization of copper slag and cullet to vitrify arsenic-containing residue

Zongwen Zhao¹, ○Meiqing Shi^1,2, Bing Peng^1,2, Liyuan Chai^1,2, Yanjie Liang^1,2, Zhihao Yan¹ (1. Central South University, 2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution)

Chairman:JI Whan Ahn（KIGAM）, Richard Alorro (Curtin University)

Keywords:Arsenic-containing residue, vitrification, Copper slag, Cullet

Arsenic-containing residue is a hazardous waste produced in metallurgical process and contains a large portion of arsenic, which is highly toxic and is listed as a hazardous waste. The immobilization of arsenic-containing residue using the mixture of copper slag and cullet by conventional melting-quenching method has been investigated in this study. X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR) and Scanning electron microscopy with energy dispersive spectrometry (SEM-EDS) were used to investigate the arsenic vitrification. The XRD indicates that the arsenic could participate in the glass structure and contribute to the formation of glass. The FTIR spectrum of the specimens have revealed that the silicate polymerized structures can be strengthened by the addition of arsenic-containing residue, which explains the arsenic immobilization mechanism in the specimen. SEM-EDS analysis proves that the specimen has compact surface, which ensures the specimen has good mechanical and chemical properties, when the copper slag/cullet ratio is 1:1. Moreover, the USEPA toxicity characteristics leaching procedure (TCLP) test was conducted to measure the safety of the vitrificate. The result reveals that the corresponded leached concentrations show a sharp decrease due to the forming of arsenic chemically bonds in the amorphous structure