顶侧吹双炉连续炼铜渣型优化

Optimization of copper slag type in double-furnace continuous smelting with top and side blowing

利用FactSage软件研究了赤峰双炉连续炼铜过程中不同渣系和造渣剂添加量对熔渣熔点、黏度的热力学影响规律。结果表明:熔炼渣熔点是随CaO、SiO_(2)、MgO以及Al_(2)O_(3)添加量增加而增大的。当吹炼渣中CaO含量超过15%时,吹炼渣的熔点迅速升高。熔炼渣黏度随CaO、SiO_(2)和MgO添加量的增加而降低,随Al_(2)O_(3)添加量增加而增大。结合生产实际得出:随着熔炼温度从1200℃升高至1350℃,熔体黏度由0.3 Pa·s降低至0.128 Pa·s。吹炼渣黏度比熔炼渣黏度小,随CaO和SiO_(2)添加量增加而减小,说明适当升高温度和造渣剂添加量有助于提高渣的流动性。在1340℃熔炼时,最优熔炼渣型组成为CaO 2.5%~3%,SiO_(2)20%~22%,MgO 1.5%,Al_(2)O_(3)4%~4.5%,铁硅比为1.9~2.0。在1280℃吹炼时,最优熔炼渣型组成为CaO 8.5%~9.5%,SiO_(2)1.5%~2.5%,铁含量在30%左右,铁钙比为3.4左右。

The thermodynamic effects of different slag systems and the amount of slagging agent on the melting point and viscosity of slag in Chifeng continuous copper smelting process were studied by FactSage software.The results show that the melting point of slag increases with the increase of CaO,SiO_(2),MgO and Al_(2)O_(3) addition amounts.When the CaO content in the blowing slag exceeds 15%,the melting point of the blowing slag increases rapidly.The viscosity of melting slag decreases with the increase of CaO,SiO_(2) and MgO addition amounts,and increases with the increase of Al_(2)O_(3) addition amount.With the melting temperature increasing from 1200℃to 1350℃,the melt viscosity decreased from 0.3 Pa∙s to 0.128 Pa∙s.The viscosity of blowing slag is smaller than that of melting slag,and decreases with the increase of CaO and SiO_(2) addition amounts,indicating that the appropriate increase of temperature,and the amount of slagging agent is helpful to improve the fluidity of slag.When melting at 1340℃,the optimal smelting slag type is CaO addition amount of 2.5%-3%,SiO_(2) addition amount of 20%-22%,MgO addition amount of 1.5%,Al_(2)O_(3) addition amount of 4%-4.5%,and iron to silicon ratio of 1.9-2.0.When blowing at 1280℃,the optimal smelting slag type is CaO addition amount of 8.5%-9.5%,SiO_(2) addition amount of 1.5%-2.5%,the iron content about 30%and the iron-calcium ratio of about 3.4.