锌在包钢高炉中行为机制

来源期刊：钢铁2011年第8期

论文作者：张芳 张世忠 罗果萍 郝忠平 王巨清

文章页码：7 - 11

关键词：高炉； 锌负荷； 瓦斯灰； 风口； 凝结物

Key words：blast furnace； zinc-load； gas ash； tuyere； coagulation

摘    要：首先测定了包钢炼铁厂6号高炉入炉原燃料及产出项的锌含量,并结合取样期间高炉实际生产数据对6号高炉做了锌平衡分布计算。其次,采用LS230型激光粒度分析仪对各级瓦斯灰的粒度进行检测;采用扫描电镜(SEM,Hitachi S-3000)及能谱分析(X-EDS)对包钢6号高炉炼铁原料及产出物的微观形貌进行观测,并对其赋存状态进行分析。结果表明,包钢6号高炉锌负荷为0.625kg/t,在国内处于中等偏高水平,必须对烧结矿和球团矿中的锌含量加以控制。支出项中,由瓦斯灰带走的锌量最多,占总支出量的96.14%,应严格控制各级除尘灰进入烧结系统。含锌吸附物均匀分布于瓦斯灰中,不同粒度瓦斯灰对锌的吸收能力有所不同。锌在瓦斯灰中主要以ZnO的形式存在,但其中还含有锌的铁酸盐、硅酸盐、铝酸盐以及硫化物。锌在风口凝结物中的存在形式为金属锌或铅锌合金。

Abstract: Based on the contents of zinc in the input and output except for the production data of No.6 BF of Baotou Iron and Steel(Group) Co.,the equilibrium distribution of zinc was calculated.Moreover,the particle sizes of gas ash of No.6 BF were measured by LS230 laser particle size analyzer;the micro-morphology of all input and output was investigated by means of scanning electron microscopy(SEM,Hitachi S-3000) coupled with an energy-dispersive X-ray analysis(EDX).The results show that the general burdens of zinc were 0.625kg/t,and some measures need to be taken to reduce the contents of zinc of sinter and pellet.The amount of zinc emitted from blast furnace with gas ash was 96.14%(in mass).Therefore BF gas ash isn′t appropriate to be recovered as the sintering materials.Furthermore,the zinc-adsorbate equally distributed in gas ash and the particles with different sizes had distinct ability to adsorb zinc.Zinc in gas ash presents as not only ZnO mainly,but also ferrite,silicate,aluminum or sulfide.Zinc in coagulation in tuyere existed in the state of metal Zn or lead-zinc alloy.