·26· 北京科技大学学报 1998年第1期 Classification on the Foaming Behaviours in Metallurgical Melts Chu Shaojun Wu Keng Niu Qiang Yang Tianjun Metallurgy School,UST Beijing,Beijing 100083,China ABSTRACT Based on experimental results,it shows that the foaming behaviours occurred in metallurgical melts is similar to that taken place in aqueous solution.There are two types of foam structure,spherical foam and polyhedral foam,in the bath-smelting processes and the foaming process of Al alloy melt.Foams with large bubbles,generated by argon gas injection into liquid slag with a mon-orifice nozzle,have polyhedral bubble cells and the foamability of slag is affected by the gas injection rate and container scale besides the surface tension and the viscosity of slag.Foams with fine bubbles,generated by slag/metal interfacial reaction in the bath-smelting process or the decomposition of TiH,in molten Al alloy,have spherical bubble cells in the initial foaming stage and the transla. tion from spherical bubble structure into polyhedral bubble structure takes place at the end of foaming process.Under conditions of gas evolution due to chemical reaction in melts,the foam stability is strongly affected by the rate of gas evolution,the size of bubbles and the fluid flow form besides the physico-chemical properties of melts. KEY WORDS foam;foaming slag;bath-smelting reduction;foamed aluminium 上上1、’26· 北 京 科 技 大 学 学 报 1998年 第 1期 Classification on the Foaming Behaviours in M etallurgicalMelts Chu Shaojun Wu Keng Niu Q 增 )rang 7~anjun Metallurgy School，LIST Beijing，Beijing 100083，China ABSTRACT Based on experimentalrcsmts，jtshows that the foaming behaviours occurred in metallurgicalmeltsissimilarto thattakenpIacein aqueoussol 0n． There ale two type s offoam stn~RLr~，sphericalfoam~and polyhedralfoam ，in the hath-sme lting pc(g3~gcs and the foaming pro~ ss of AI alloy me lt．Foams with large bubbles，generated bY argon gas injection into liquid slag with a mOU-orifice nozzle，have polyhedralbubble cells and the foamability ofslag isafected by the gas injection rate and containerscale besides the surface tension and the viscosity of slag．Foams with fine bubbles，generated by slag／metal intefaeial reaction in the ha th -sm elting pro~ ss or the dec omposition of Ti82 in molten AI alloy，have spherical bubble cells in the initial foaming stage and the transla￾tion from sphericalbubble st／llc~trg into polyhedralbubble $tl'UCIlll~ takespIace atthe end of foaming process．Under conditions of gas evolution due to che mical reaction jn me lts，the foam stability is strongly afected by the rate of gas evolution，the size of hubbles and the fluid flow fonilbesides the physico-chemical prope rties of me lts． KEY W ORDS foam；foaming slag；ha th-sme lting reduction；foamed alIlfrIini啪 维普资讯 http://www.cqvip.com