难混溶CuCr合金电渣精炼过程界面控制的研究

项目名称： 难混溶CuCr合金电渣精炼过程界面控制的研究

项目编号： No.50874027

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 化学工业

项目作者： 牛丽萍

作者单位： 东北大学

项目金额： 35万元

中文摘要： 本课题研究了铝热还原-电渣精炼CuCr合金的界面控制问题。对Al2O3基精炼渣系研究表明Na2O、Li2O和MgO均可降低CaO-Al2O3渣系的黏度，对CaF2-CaO-MgO-Al2O3-SiO2渣系黏度、密度、表面张力等进行了测量，并分析了淬冷渣的物相。CaO-Al2O3-CaF2-Cr2O3渣的高温黏度较低，1500℃#26102;渣样的黏度小于0.1Paos。对CaO-MgO-Al2O3精炼渣建立了基于完全离子溶液模型的黏度模型，并基于共存理论建立了CaO-Al2O3-CaF2-SiO2MgO-渣作用浓度计算模型。CaO-Al2O3基精炼渣吸收Al2O3夹杂的速率的研究结果表明：对CaO-Al2O3-CaF2渣，增加CaF2含量和CaO/Al2O3比值都可提高Al2O3夹杂物的溶解速率。不同配料比，不同添加剂种类，添加剂用量以及电磁搅拌等条件下采用铝热还原法制备出的合金铸锭中存在大量气孔及夹杂物，金渣分离不完全。基于ANSYS软件计算了渣池与结晶器、渣池与大气、自耗电极与大气、渣池与金属熔池之间的热交换系数。分析得到系统中温度场和电场的分布，高温区分布在渣池和自耗电极接触界面。

中文关键词： CuCr合金；电渣精炼；界面控制；夹杂物；数值分析；

英文摘要： The studies on interface controlling of aluminothermic reduction - electro slag refining CuCr alloy are analyzed. Research on Al2O3 based refining slags shows that the addition of Na2O、Li2O and MgO could decrease the viscosities of the CaO-Al2O3 melts. The viscosities, densities and surface tensions of CaF2-CaO-MgO-Al2O3-SiO2slags are measured, and the phase structures of the slags are analyzed. Viscosities of slags are lower than 0.1 Paos under high temperature. Based on Temkin's model, a viscosity estimation model of CaO-MgO-Al2O3 is obtained. In accordance with the coexistence theory of slag structure massaction concentrations model for CaF2-CaO-MgO-Al2O3-SiO2slag melt has been deduced. The results of the dissolution rate of solid alumina into the slag show that in the CaO-Al2O3-CaF2 system, the dissolution rate of solid alumina into the slag increased with the increasing the CaF2 content and CaO/Al2O3 mass ratio. In the cases of different ingredients, types of additives, additive content, and electromagnetic stirring conditions, there are a large number of pores and inclusions in the alloy ingots prepared by aluminothermic reduction, which shows incomplete separating metal from slag. Based on ANSYS software, heat exchange coefficients between slag pool and crystallizer, Slag pool and the atmosphere, Consumable electrode and the atmosphere, Slag pool and molten pool are calculated. Distribution temperature field and electric field in the system are obtained, and the results show that high temperature area distribution in the contact interface betweent slag pool and consumable electrode.

英文关键词： CuCr alloy;electroslag refining ; interface control; inclusions ; numerical analysis;