材料期刊网

介绍了国内外转底炉直接还原工艺发展现状,提出含碳球团造块技术、转底炉装料机设计、转底炉出料机设计、转底炉炉温、炉压及炉内气氛的控制以及金属化球团防氧化技术等是保障转底炉连续稳定顺行的关键技术。合理的水分、压力及粘结剂种类可以获得较好的压球效果;振动给料机和装有硬质耐磨合金的螺旋出料机是目前转底炉装、出料机的主流;根据原料的不同,各厂家已摸索出适宜的炉温、炉压等工艺参数,并对金属化球团采取冷却或隔绝空气的保护措施。

The current development of rotary hearth furnace (RHF) technologies for direct reduction is introduced in this paper. The cold-pressing technology, the design of charging and discharging machines of RHF, the controlling of temperature, pressure and atmosphere in the furnace, and the antioxidation of metallized pellet are the key technologies for ensuring stable and continuous operation of RHF. Reasonable water content, pressure and binder categories could obtain preferable briquetting results. Vibration feeder and spiral discharging machine with hard alloy on the surface of the blades are the major facilities in RHF system. According to the supply of raw materials in different plants, suitable technological parameters of RHF, such as temperature, pressure atmosphere in the furnace have been investigated. In addition, cooling or air isolation measures to protect metallized pellet are also developed.