Patents
An improved process for extraction of copper, selenium, tellurium and gold from anode slime of copper electrorefining plant which comprises: (i) grinding the anode slime of composition such as herein described to 140-160µm in size, (ii) characterised in that adding sulphuric acid and additive selected from sodium chloride, manganese dioxide and mixture thereof to said ground anode slime with solid to liquid ratio in the range of l:7to 1:12, (iii) stirring the solution obtained in step (ii) for a period of 4-6 hours in the temperature range of 30-80°C, (iv) filtering the leach slurry obtained in step (iii), (v) recovering copper, selenium, tellurium and gold from the said filtrate by known method.