Matrix and pH Effects on the Degradation Kinetics of Xanthates in Mining Waters

The main focus of this project is to determine optimal pH conditions for a given matrix of xanthates that would be representative of a real matrix in an industrial setting such as a flotation tank or a tailings pond. The primary method for analysis is the use of headspace GC-MS. Aqueous samples of xanthates in buffer solutions were tested for degradation by testing for the generation of carbon disulphide. It is projected that for optimal results, pH will be above 7. The research being conducted is to determine the optimal pH level for the rate of xanthate decomposition and will be confirmed through calculation of rate constant, k, at these levels. Depending on how the stabilization or destabilization of the degradation reaction proceeds there will be a measurable change in the evolution of carbon disulphide gas. This change can be calculated and will help to determine the positive or negative effects of a given matrix of co-solutes. The implications of this research include increase in mineral yield such that mining companies like New Gold can better develop their industrial processes to make better use of xanthates. As well, companies will be able to minimize and potentially decrease environmental and health hazards posed by by-products such as carbon disulphide gas. This will help ensure that mines can create environmentally sustainable procedures and processes to keep their workers in safe conditions