X-ray Spectral Determination of Gold in Geological Samples after Preconcentration Using Low Temperature Assay Melting
The technology of gold extraction into the lead from the mixture with powder sample during the low-temperature alkaline melting is developed. The optimum mass ratio of the sample, lead and alkali, heating conditions, the temperature and duration of fusing that provide a satisfactory extraction of gold are specified. A low fusing temperature lightens the furnace design, reduces energy consumption and shortens the entire cycle from the beginning of fusing to loading of the next batch of crucibles. Simultaneous fusion of a large number of samples on a small area appeared possible due to the modular principle of furnace arrangement. The results of gold determination using x-ray fluorescence method and developed technology of concentration meet the regulatory requirements to the accuracy of determination.