基于OxyCup竖炉处理工艺的尘泥团块软熔性能

Soft-melting property of dust briquettes based on OxyCup shaft furnace

为了使OxyCup竖炉工艺有效处理钢铁企业含铁尘泥,基于OxyCup竖炉工艺,通过改变还原气氛、硅石的添加方式以及荷重研究尘泥团块的软熔性能。结果表明,当φ(CO2)/(φ(CO)+P(CO2))值为0时,尘泥团块的最大压差约为587Pa,软化区间为900~1030℃,滴落区间为1191~1203℃,基本不存在软熔带,随着CO2体积分数升高,尘泥团块软化区间缩小,滴落区间迅速扩大,软熔层迅速增厚;当φ(CO2)/(φ(C0)+φ(CO2))值为1时,尘泥团块软化区间为971~977℃,滴落区间为985~1192℃,软熔带较厚;硅石层装与硅石混装较硅石内配时,最大压差较低,且熔滴温度区间较窄;不同荷重条件下,尘泥团块的压差变化规律相似,最大压差较小,荷重对尘泥团块的软熔性能影响较小。

In order to make the OxyCup shaft furnace process effectively treat iron dust in steel companies,by chan- ging the reduction atmosphere,the addition way of silica and load,the soft-melting property of dust briquettes in OxyCup shaft furnace was studied.Results showed that when the value of φ(CO2)/(φ(CO)+φ(CO2))was 0,the maximum pressure gradient of dust briquettes was about 587Pa,with the softening temperature of 900-1030℃, and the dropping temperature was 1191-1203℃.At the same time,there was no obvious cohesive zone.With the increase of CO2volume percentage,the softening temperature of the dust briquettes decreased,the dropping temperature rapidly increased.When the value of φ(CO2)/(φ(CO)+φ(CO2))was 1,the softening temperature of the dust briquettes was 971-977℃,and the dropping temperature was 985-1192℃,and there was a thick cohesive zone. Compared with the dust-silica briquettes,the maximum pressure gradient was lower,and the temperature range of cohesive zone was narrower by mixing or layering silica.Under different loading conditions,the change rule of pressure gradient was similar,the maximum pressure gradient was small,and the loading had little influence on the soft- melting property of dust briquettes.