| abstract |
The process of fire refining of primary copper and / or scrap copper, containing lead and zinc, in a basic-lined furnace, during which the charge introduced into the furnace is melted so that the lead and zinc as well as other unwanted impurity materials are removed by oxidation of the molten bath, is characterized in that a slag forming agent corresponding to 1 to 5% of the feeds introduced is added to the metallic molten bath and composed, by weight:. from 30 to 70% of red mud,. from 10 to 30% of calcium oxide and / or of calcium carbonate and / or of calcium hydroxide,. from 5 to 30% silicon dioxide, and. from 0 to 30% galvanizing sludge. The slag forming agent contains by weight:. from 30 to 70% of red mud,. from 10 to 30% of calcium oxide and / or of calcium carbonate and / or of calcium hydroxide,. from 5 to 30% silicon dioxide, and. from 0 to 30% galvanizing sludge. |