单位质量反应热对铝热法制备钛铁合金的影响

Effect of Reaction Heat per Unit Mass on Preparation of Ferrotitanium by Thermite Method

考察了单位质量反应热对不同目标钛铁合金实验结果的影响.利用SEM扫描电镜、EDS能谱分析、氮/氧/氢分析仪及ICP对合金进行了系统分析.结果表明:体系单位质量反应热增加,物料燃烧速率增大,但随着合金中钛质量分数增加而降低.单位质量反应热增加,渣金分离效果变好,有利于Al2O3夹杂去除,合金中Al,O质量分数逐渐降低.单位质量反应热一定时,随着合金中钛质量分数增加,渣金分离效果变差,与Ti结合的Al质量分数增加,合金中Al,O质量分数增大.单位质量反应热增加对制备钛质量分数高的钛铁合金反应速率、渣金分离效果及合金收率影响更为显著.

Effect of reaction heat per unit mass on the ferrotitanium prepared by thermite method was studied.The samples were analyzed by scanning electron microscope,energy spectrum analyzer,oxygen/nitrogen/hydrogen analyzer and inductively coupled plasma emission spectrometer.The results indicate that the burn rate of the ingredients gradually increases with the increasing reaction heat per unit mass,while it decreases with the increasing Ti content of the objective ferrotitanium.Meanwhile,when the reaction heat per unit mass increases,the Al and O contents of the alloy decrease.A higher reaction heat per unit mass is beneficial to the removal of Al 2O 3 inclusion because of a better slag-metal separation.Nevertheless,under the same reaction heat,the effect of slag-metal separation goes worse and Al and O contents increase with the increasing Ti content of the objective ferrotitanium.Reaction heat per unit mass has a greater effect on the burn rate,slag-metal separation and the recovery of objective ferrotitanium with high Ti content.