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发明公开
CN101624639A 一种防止铁矿粉流态化高氢还原粘结失流的方法 失效 - 权利终止

一种防止铁矿粉流态化高氢还原粘结失流的方法
摘要：
本发明提供一种防止铁矿粉流态化高氢还原粘结失流的方法，属于炼铁生产技术领域。本方法对粒度小于1mm的铁矿粉，采用流态化高氢还原工艺，在流化床还原温度为650℃～850℃，还原气体为H 2 ＝60～80％，CO＝20～40％，气流线速度为0.3～0.6m/s条件下还原时，将粒度小于1mm的添加剂焦炭粉或石灰石粉或白云石粉以铁矿粉质量比2～8％的比例与铁矿粉均匀混合。添加三种不同添加剂的铁矿粉流化效果明显改善，巴西铁矿粉还原后的金属铁含量平均提高12～16个百分点，金属化率和还原率平均提高12～21个百分点，澳大利亚铁矿粉还原后的金属铁含量平均提高17～24个百分点，金属化率和还原率平均提高15～29个百分点。
摘要（英）：

The invention provides a method for preventing fluidization high-hydrogen reduction bonding defluidization of iron ore powder, which belongs to the technical field of iron smelting production. In the invention, iron ore powder with a particle size which is less than 1 mm is reduced by adopting a fluidization high-hydrogen reduction technology under the conditions that the reduction temperature of a fluidized bed is 650-850 DEG C, the reducing gas H2 occupies for 60-80 percent, the CO occupies for 20-40 percent, and the flow line is 0.3-0.6m/s; additive coke powder or limestone powder or dolomite powder is evenly mixed with iron ore powder in the mass ratio of 2-8 percent, the fluidization effect of the iron ore powder with three different additives is obviously improved, the reduced metallic iron content of Brazil iron ore powder is evenly increased by 12-16 percentage points, the metallization rate and the reduction rate are evenly increased by 12-21 percentage points, the reduced metallic iron content of Australian iron ore powder is evenly increased by 17-12 percentage points, and the metallization rate and the reduction rate are evenly increased by 15-29 percentage points.

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