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In this project, analysis of lead ore of Dalian region was carried out and then lead extracted from the ore. Lead is a grey colored metal, which is not found in free form, rather it is found in mineral with other metals such as Sulphur. Galena is the most commonly present lead ore. The technique used for the analysis of lead ore was ICP (Inductively Coupled Plasma). Lead ore was grinded to make powder with the help of pestle and mortar. This powder was taken as a sample and dissolved in concentrated HNO3 and aqua Regia separately for the preparation of solutions. Aqua Regia is a mixture of HNO3 and HCL with molar ratio 1:3 respectively. Ore was digested by heating in microwave oven in case of HNO3 and at hot plate in case of aqua Regia. After digestion, solutions were filtered and diluted with distilled water. Nebulizer of ICP converts the solution to aerosol, which was analyzed and detected. It gives the composition of metals in the ore. Lead was present in large quantity in the ore, which was taken for analysis in this project. For extraction, lead was heated in a furnace with a limestone in the presence of coke, which acts as reducing agent and also used for the purpose of heat. Lead obtained from this method is 99% pure. |
