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球铁处理炉前操作规程 | 2010-9-24 8:55:00
球铁处理炉前操作规程
1. 材料准备
1.1铁水应确保化学成份合格,出铁温度:电炉:1440-1480℃,冲天炉1420-1480℃。
1.2球化剂:应严格按规定的牌号及数量加入: 电炉:1.3-1.5%,冲天炉1.5-1.8%。
1.3孕育剂:应严格按规定的牌号及数量加入如用75#硅铁,大包孕育粒度应在3.0-15mm之间,小包孕育粒度应在0.5-3.0之间。
2. 炉前操作规范
2.1球化剂的装载:先将处理包预热到大于600-800℃(暗红色),清除包底残渣铁块,向堤坝内装入球化剂,上面覆盖硅铁和硅钢片,然后再覆盖除渣剂,铁水温度较高时应注意舂紧和覆盖工作。
2.2冲入铁液:铁液冲向未放置球化剂的一侧,冲入2/3-1/2铁液其深度不小于200-300mm, 冲入后反应应沸腾1分钟以上,如反应太迟,可用钢钎捅破覆盖层, 反应将要结束时,再冲入其余铁液,补加铁液时可随流添加孕育剂。处理完毕,加聚渣剂搅拌后彻底除渣,再覆盖保温剂。
2.3球化情况判断:
2.3.1铁液冲入一定高度(>200-300mm)开始起爆,均匀持续沸腾足够时间(>1分钟),表示反应正常;
2.3.2补加铁液时液面逸出镁光及白黄色火焰表示正常;
2.3.3处理后铁液表面易形成氧化膜表示正常;
2.3.4 反应过猛喷出铁液表示烧损过大, 反应时间过短过长属不正常现象。
3. 注意事项
操作者应带手套、口罩、工作服,防止含有稀土合金粉末侵入身体,防止起爆时飞贱烫伤;观察球化反应时应带防护眼镜。
- 上一篇:装车工安全操作规程
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