Research On Optimization Of Slag Shape In Top-blown Copper Smelting System

Due to the adaptability of raw materials of copper ore and high-copper copper concentrate at home and abroad,the MgO content of the top-blown copper smelting system is forced to increase to 1%?1.5%,and the molten pool temperature is lower than1200?.Leading to volatile impurities in the raw materials during the smelting process,causing the flue nodulation,corroding the flue,deteriorating the working state of electric dust collection,and the high melting point substance in the concentrate will raise the melting point and viscosity of the slag,resulting in difficulty in slagging and shortening The life of the furnace,the slag is easy to foam,and the slag contains too much copper.In order to solve this problem,this study optimizes the slag type of top-blown copper smelting slag,improves the properties of slag,reduces the temperature of the molten pool,and reduces the loss of valuable metals in the slag,providing a theoretical basis for industrial practice.In this paper,the slag of copper smelting system is taken as the research object.Through the mineralogical morphology and phase analysis of the smelting slag,it is determined that the main component of the slag is magnesium-containing fayalite((Fe,Mg)SiO₄).In the presence of metallic copper and copper-iron sulfide phase(CuFeS₂),it can be seen from the scanning electron micrograph of the synthetic slag that the added calcium oxide is dissolved in the glass phase in the slag,and the iron is concentrated,and the surface of the slag becomes dense and reduces.The mechanical inclusion loss of copper.The smelting slag of the top-blown copper smelting system is used as the mother slag.Through the four processes of proportioning-preparation-slag-smelting,it is concluded that the original slag sample of the smelting furnace slag destroys the original slag type and the melting point of the slag is raised by 200?;adding CaO can reduce the melting point of slag,the CaO content in slag increases by one percentage point,the melting point of slag is reduced by 10?;CaO can reduce the copper content in slag,which has practical significance for reducing copper content in electric furnace slag,and will increase Fe₃O₄ content;An increase in the MgO content will increase the melting point of the slag,and the MgO content in the slag will increase by 0.5%,and the melting point of the slag will increase by 10?.Using STOKES sedimentation formula to calculate the settling time of electric furnace slag with different particle sizes,it is determined that the sedimentation speed of the diameter of 5.26?m is 1200? and the sedimentation rate is 2.23mm/h,which has not been melted in the settling furnace.The slag is completely separated and discharged with the slag.Using the Equilib module of Fact Sage thermodynamic calculation software,the calculation of slag multi-phase equilibrium calculation and phase diagram is simulated.The simulation types include slag initial liquid phase temperature,final liquid phase temperature,slag melting amount and viscosity,and the simulation results are compared with the experimental results.The results show that the simulation results are consistent with the experimental results of synthetic slag.Using the Phase Diagram module of Fact Sage software,the phase diagram of CaO-SiO₂binary system,the phase diagram of FeO-SiO₂-CaO ternary system,and the phase diagram of FeO-SiO₂-MgO-CaO quaternary system were investigated,and CaO-SiO₂was obtained.The slag type product is Ca SiO₂(wollastonite);the slag liquid phase of FeO-SiO₂-CaO ternary slag is intercalated with fayalite(Fe₂SiO₄);FeO-SiO₂-MgO-CaO quaternary slag system with CaO The increase of the content and the increase of the liquid phase area of the slag prove that CaO can lower the melting point and viscosity,and from the liquid phase area of slag at 1600? with CaO content of 20%,30%,40%,CaO is not more Good;from the fixed MgO content of 0.5%?2%phase diagram,the more MgO content,the more complex the phase diagram composition,the higher the melting point.According to the production practice data,the slag melting amount is simulated and combined with the phase diagram theory slag type to determine the best slag type:Fe₃O₄ 8%;Fe 32%?38%;SiO₂ 24%?34%;MgO 1%?3%;CaO 2%?4%.