Abstract: The reduction roasting and weak magnetic separation techniques were adopted to recover high grade iron-rich ore from blast furnace sludge, and in the roasting process, CH3COOH solution was used to reclaim zinc in a by-product of Zn(CH3COO)2. The optimum conditions were obtained as follows: temperature 1373.2 K, and time 60 min. Through the reduction roasting, the dezincification rate reached up to 98%, a high grade iron ore with only 0.04% zinc was obtained. By weak magnetic separation 80% iron rich ore was obtained, the purity of Zn(CH3COO)2 reached 98.7%. The iron ore could be directly used in industries.

Key words: blast furnace sludge, reduction roasting, dezincification rate, weak magnetic separation, Zn(CH3COO)2

摘要： 利用高炉尘泥以还原焙烧-磁选工艺获得高品位富铁矿，由醋酸回收液回收还原后的锌得到高纯度醋酸锌产品. 研究得出合理的焙烧工艺条件是：温度1373.2 K、时间60 min. 通过还原焙烧，高炉尘泥脱锌率可达98%，并得到含锌率仅为0.04%(w)、金属化率高的还原矿. 还原矿在150 mT的磁场强度下弱磁选可得铁品位在80%左右的富铁矿，回收液经浓缩结晶后得到纯度达98.7%的醋酸锌副产品. 所得富铁矿和醋酸锌可工业应用.

关键词: 高炉尘泥, 还原焙烧, 脱锌率, 弱磁选, 醋酸锌