PROCESSING OF CADMIUM-CONTAINING MAN-GENERATED WASTE

Background. At the enterprises of the metallurgical and chemical industries there are manmade cadmium-containing wastes. Thus, JSC Navoiazot annually stores 80-120 tons of spent "CadmiumCalcium-Phosphate Catalyst (CCP)" TU 113-03-00209510-108-2006, the service life of which is 6 months. Purpose:to develop methods of extraction of cadmium from the spent CCP catalyst with subsequent use as a cadmium raw material in a new cycle of CCP synthesis. Methodology. The fractions of CdO, CaO, and P2O5 in the spent CCP were determined on an ICP-MS spectrometer. The CCP samples were dissolved in acids, with the separation of carbon on a filter from the CCP decomposition solutions. Sorption of cations was carried out on Purolite C100H resin. Originality. A method for extracting Cd from spent CCP has been developed; a method for the synthesis of CCP from recovered cadmium has been developed; a successful pilot test of the obtained catalyst was carried out. Findings. Information was obtained on the optimal modes of processing of the spent CCP catalyst. A technological scheme for the isolation of the intermediate product synthesis of CCP - cadmium concentrate is proposed. Highlights: - a method for extracting Cd from spent CCP has been developed; - a method for the synthesis of CCP from recovered cadmium has been developed; - an experimental-industrial test of the methods was carried out