CHLORINATION BEHAVIORS OF COPPER PHASES BY CALCIUM CHLORIDE IN HIGH TEMPERATURE OXIDIZING-CHLORIDIZING ROASTING

摘要

The high temperature oxidizing-chloridizing roasting is one of useful methods to separate nonferrous metals from pyrite cinder and metallurgy slag. However, as one kind of main nonferrous metals in pyrite cinder and metallurgy slag, copper's chlorination behavior is not demonstrated. In the present study, chlorination behaviors of CuO, Cu_2O and CuS at the temperature range of 1025-1175 °C in air by simulating the chloridizing roasting process of pyrite cinder and metallurgy slag have been investigated. It is shown that Cu_2O and CuS is much easier to remove, CuO is refractory to remove. In addition, the presence of SiO_2 and CaO increases the Cu removal rate from CuO while the presence of SiO_2, Al_2O_3, CaO and MgO decreases the Cu removal rate from Cu_2O. Fe_3O_4 influences the Cu removal rate from CuO and Cu_2O positively.