摘要
钢铁企业每年产生占钢产量10%的钢铁冶炼尘泥,尘泥中含有大量Fe、C和有价元素。为实现尘泥的二次资源利用,莱钢采用“水洗脱氯分盐-回转窑脱锌富铁”技术,建立处理量15万t/a、以回转窑为主体的钢铁冶炼尘泥综合利用生产线。整个工艺分为智能配料返料、水洗脱氯除杂、三效蒸发分盐、回转窑烟化富集、窑渣冷却、余热利用、收尘及表冷、脱硫等8大系统。通过水洗脱氯及分盐系统回收纯度≥90%的氯化钠、氯化钾;通过回转窑主系统回收次氧化锌和富铁窑渣,氯化钠、氯化钾、次氧化锌作为产品外售,富铁窑渣可代替铁矿石返回烧结或高炉系统,实现冶炼尘泥的全资源利用。
Iron and steel enterprises produce steel smelting dust which accounts for 10%of steel output each year.The dust contains a large amount of Fe,C and valuable elements.In order to realize the secondary resource utilization of dust and sludge,Laiwu Steel adopts aDechlorination by Water-Dezincification by Fire technology,,to establish a comprehensive utilization production line of iron and steel smelting dust and sludge with rotary kiln as the main body.The processing capacity is 150000 t/a.The whole process is divided into eight systems including intelligent batching and return,dechlorination by water washing and impurity removal,threeeffect evaporation and salt separation,rotary kiln smoke enrichment,kiln residue cooling,waste heat utilization,dust collection and surface cooling,and desulfurization.Recover sodium chloride and potassium chloride with a purity of ≥90% through the water elution chlorine and salt separation system;recover secondary zinc oxide and iron-rich slag through the main system of the rotary kiln.Sodium chloride,potassium chloride and secondary zinc oxide are used as products to be sold outside,and iron-rich kiln slag can replace iron ore and return to the sintering or blast furnace system to realize the full resource utilization of smelting dust and mud.
作者
李梦婷
胡孝武
谭龙辉
LI Mengting;HU Xiaowu;TAN Longhui(Hunan Boe Environmental Protection Technology Co.,Ltd.,Changsha 410000,China)
出处
《山东冶金》
CAS
2022年第4期67-70,共4页
Shandong Metallurgy
关键词
钢铁冶炼尘泥
回转窑
洗氯分盐
富铁窑渣
iron and steel smelting dust and mud
rotary kiln
washing chlorine and salt
iron-rich kiln slag
