Abstract
The thermal decomposition of a complex cyanide precipitate from a gold mill effluent treatment process [CANMET acidification-volatilization-reneutralization (AVR) Technology] was studied using thermogravimetry (TG)-Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The precipitate contained KZn cyanoferrates and copper thiocyanate. The TG/FTIR experiments were conducted in He and H 2-He atmospheres. The decomposition was found to occur in three stages. In the first stage, the dehydration of the cyanoferrates and the decomposition of the thiocyanate occurred. In the second stage, the decomposition proceeded with the formation of metallic copper and metal sulphides and cyanides. In the third stage the product contained metallic copper, iron and iron carbide. Iron sulphide was also detected when the decomposition occurred in He alone.
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