高炉炼铁条件下微钛熔渣中Ti还原行为

Reduction Behavior of Ti in Low TiO_2 Content Slag During Blast Furnace Ironmaking Process

为了确定高炉含钛物料护炉合适的工艺参数，以TiO2含量为1．0％～5．0％的微钛熔渣和高炉普通生铁为原料，通过熔渣-铁液反应研究熔渣的TiO2含量、温度、反应时间、渣／铁比、熔渣二元碱度等因素对Ti还原行为的影响。结果表明，增加熔渣的TiO2含量和二元碱度、提高温度、延长反应时间对铁液中Ti含量的增加均具有促进作用；其中，反应时间一定时，熔渣的TiO2含量和温度对铁液Ti含量的影响尤为显著，熔渣二元碱度对铁液的Ti含量影响较小。温度一定时，铁液中的Ti含量与反应时间的关系符合公式埘…=kt＋c（k、c为常数）。渣／铁比由0．25增加到0．40，铁液中的Ti含量增加比较快；渣／铁比由0．40增加到0．50，铁液中的Ti含量增加比较慢；渣／铁比由0．50进一步增加到0．80，铁液中的Ti含量呈缓慢下降趋势。

To determine the appropriate parameters for hearth lining protection by using TiO2 containing materials, the influence of Ti02 content in slag, temperature, reaction time, ratio of slag to hot metal, and w cio〉/W（sio2） slag binary basicity on reduction behavior of Ti in slag with low TiO2 content, i. e. , 1.0- 5.0 %, has been experimentally investigated through slag-hot metal reaction. The results show that the increase of TiO2 content and binary basicity of slag, temperature, and reaction time contributes to Ti content increasing in hot metal. When the reaction time is fixed, Ti02 content and temperature of slag have noticeable influence on Ti content in hot metal while binary basicity of slag has little influence. When the temperature is fixed, the relationship between Ti content and reaction time can be described by W[Til = kt ＋ c with k and c as constants. Ti content in hot metal increases rapidly with the increase of ratio of slag to hot metal（RSM） from 0.25 to 0.40, and it increases slowly in the RSM range of 0.40 to 0.50; further increase of RSM from 0.50 to 0.80 can result in a slow decrease of Ti content in hot metal.