| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: method for determining precious metals in ores and their derivatives involves preparation of mixture from sample of the analysed material with fluxes, lead oxide, silver nitrate or chloride and carbon-bearing reducing agent. Then, mixture is molten at temperature of 1100-1300C so that slag and lead alloy is obtained in the form of lead bullion. After that, cupellation of lead bullion is performed till silver globule is obtained, and content of precious metals in silver globule is determined with chemical and physical-chemical methods. At that, prior to cupellation to lead bullion there added is tin metal in quantity of 0.41.0% of lead bullion weight, and cupellation is performed at temperature of 880930C. ^ EFFECT: improving the accuracy of determining the content of precious metals owing to preventing their oxidation during cupellation process. ^ 3 tbl, 1 ex |
