高炉细灰冷压成型回收铁锌

Iron and zinc recovery of fine ash by cold pressed forming

在资源短缺和环保形势日益严峻的情况下,高炉细灰的回收再利用逐渐被人们重视。XRF、SEM、EDS和XRD分析确定了细灰的元素含量、分布状态、颗粒形貌及物相组成。高炉细灰原样和添加5%的Ca CO_3的高炉细灰的TG-DSC分析表明细灰冷压块高温焙烧的最低温度应为950℃。按一定比例的马铃薯全粉和水配加不同比例的CaO制备复合黏结剂,配加到高炉细灰中压块并测定强度,当CaO含量在7%时,压块强度最大。在充入保护性气氛N2的管式炉中,950、1 050、1 150、1 250℃,分别焙烧CaO配比为7%的压块1 h,分析结果表明1 150℃时细灰去Zn效果良好,焙烧所得物质主要为Fe。该工艺除可以调节细灰的碱度外,也可以有效利用马铃薯全粉。

In the situation of resource shortage and environmental protection,recycling the blast furnace（BF）fine ash is becoming important gradually. Content of elements,distribution,morphology and phase composition of the BF fine ash were confirmed by XRF,SEM,EDS and XRD. The TG-DSC analysis of the original BF fine ash and the BF fine ash added 5% of CaCO3 revealed that the lowest temperature of the BF fine ash cold-briquet was 950 ℃. The percentage of potato granule,water and different proportion of CaO acted as a composite adhesive was added to the BF fine ash for the forming of the cold-briquet. The strength of the cold-briquet was the largest when the proportion of CaO was 7%. Filling N2 as a protective atmosphere,the cold-briquet added a proportion 7% of CaO was roasted at 950,1 050,1 150,1 250 ℃ for one hour in the tube furnace. After being roasted,the main material was iron when the temperature was 1 150 ℃. Zinc was removed. This technology not only adjust the basicity of BF fine ash,but also use the potato granule effectively.