Abstract
According to the reaction shaft operation characteristics during the flash smelting process, 15 groups of slag samples containing high Fe3O4were prepared by some chemical reagents, and the slag melting temperatures were measured using a ZDHR-200 type intelligent test instrument for ash melting point by means of hemisphere point. Then, the mathematical formula between the melting temperature and the chemical composition of freeze slag were acquired by means of nonlinear regression analysis. The effects of the Fe/SiO2ratio (mFe/mSiO2), CaO/SiO2ratio (mCaO/mSiO2), Fe3O4content (ωFe3O4), Cu2O content (ωCu2O) and MgO content (ωMgO) on the slag melting temperature were also studied. Results show that the melting temperatures calculated by the regression formula reproduce the experimental data in molten freeze slag with high precision. The slag melting temperature ascends rapidly with increasing ωFe3O4when ωFe3O4>18%, and descends quickly when ωCu2Oraises from 3 % to 7 %, but descends slowly with increasing ωMgO. The melting temperature tend to go down first and then rise up with the increase of mFe/mSiO2and mCaO/mSiO2, arriving at the minimum when mFe/mSiO2=1.3 and mCaO/mSiO2=0.8, respectively.
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