摘要
河南灵宝某黄金冶炼厂焙烧氰化尾渣TFe品位为30.71%,针对此尾渣开展了强磁预选—直接还原焙烧—弱磁选联合提铁研究。经磁场强度为1 513 kA/m的湿式强磁预选,获得TFe品位44.96%、回收率78.27%的粗精矿。当粗精矿、烟煤和氧化钙的质量比为1∶0.2∶0.2、还原温度为1 200℃、还原时间为90min时,粗铁精矿经直接还原焙烧、二段磨矿、二段弱磁选处理,获得TFe品位为92.43%、回收率为93.21%的还原铁粉,相对于氰化尾渣的产率达24.24%。该工艺为焙烧氰化尾渣中极难选含铁资源的高效利用提供了新途径。
A combined process of high intensity magnetic preconcentration - direct reduction roast -magnetic separation was applied to recover iron from the cyanide tailings with TFe grade of 30. 71% . The tailings were taken from a gold smelting factory in Henan Province. The rough iron concentrate with TFe grade of 44. 96% and recovery of 78. 27% was obtained after being treated with high intensity magnetic preconcentration at the magnetic field intensity of 1 513 kA/m. The rough iron concentrate was dealt by direct reduction roasting at 1 200 °C for 90 min with the mass ratio of rough concentrate, bituminous coal and calcium oxide in 1：0.2 ： 0.2. Then the calcined materials were further treated by two - stage grinding and two - stage low intensity magnetic separa-tion. Finally, the reduced iron powder with TFe grade of 92. 43% and recovery of 93.2% was ob-tained. The yield of iron to the cyanide tailings reached 24. 24% . The combined process provided a novel approach for recovering refractory iron from the cyanide tailings.
出处
《矿产保护与利用》
北大核心
2017年第2期51-55,共5页
Conservation and Utilization of Mineral Resources
关键词
氰化尾渣
强磁选
直接还原焙烧
弱磁选
还原铁粉
cyanide tailings
high intensity magnetic separation
direct reduction roasting
low intensity magnetic separation
reduced iron powder
