Pyrometallurgical smelting method of copper
AssigneeNippon Mining & Metals Co., Ltd.
InventorsTakayoshi Fujii, Susumu Akagi, Yutaka Yasuda, Yoshiaki Suzuki
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Abstract
In a pyrometallurgical smelting method of copper, the copper-ore and auxiliary fuel, such as carbonaceous material, is blown through an ore-concentrate burner into a reaction shaft. In an improved pyrometallurgical smelting of copper, the carbonaceous material is used to reduce the Fe.sub.3 O.sub.4 contained in the slag. The present invention provides an improved method for reducing the Fe.sub.3 O.sub.4 even in a case at a decreased amount of auxiliary fuel is to be decreased. The carbonaceous material is blown into a lower portion of the reaction shaft where the oxygen partial pressure is low.
Claims6
A method for pyrometalurgical smelting of copper in a flash smelting furnace comprising a reaction shaft provided with an ore-concentrate burner and a settler having a roof and provided below said reaction shaft, said method comprising the steps of:
- charging a copper-ore concentrate through the ore-concentrate burner to form molten particles of the copper-ore concentrate that fall through the reaction shaft and form a melt bath and a slag layer in the settler;
- and
- charging a finely divided carbonaceous material into said flash smelting furnace wherein at least a portion of the carbonaceous material is blown into a lower portion of the reaction shaft where oxygen partial pressure (Po.sub.2) is low, whereby said portion of the carbonaceous material does not burn in the reaction shaft and is captured by the molten particles of the copper-ore concentrate falling through the reaction shaft.
Dependencies are inferred from the claim text.