采用电炉粉尘与焦炭粉的混合试样，对利用焦炭过滤床在线回收电炉粉尘，在CO/CO2混合气体中氧化锌的还原分离工艺进行了模拟研究。热力学分析表明，在所设焦炭过滤床的温度及气氛条件下，固固还原和气固还原反应都可以发生，氧化锌的还原分离是可以实现的。实验结果表明，与单独被固体碳或CO还原时相比较，混合试样在固体碳和CO同时存在时的初期减重率变化最快，最终还原率最高。在粉尘颗粒表面，被还原的金属铁生成及聚积长大后，将对还原气体向颗粒内部进一步扩散起到阻碍作用，对颗粒内部残存的微量ZnO的还原产生不利影响。如何加快氧化锌的还原分离而抑制氧化铁的还原及聚集长大将成为提高氧化锌回收率的关键。
Simulation research on the EAF dust online recycling and zinc oxide separation with coke bed filter was carried out by heating coke/dust samples in CO/CO2 gas mixture. Thermodynamic analysis shows that the solidsolid and gassolid reduction reactions would occur simultaneously and the separation of zinc oxide can be realized under set experimental conditions. The experiment results showed that comparing with the reduction only by solid carbon or CO, the initial rate of weight loss change and final reduction rate of the reduction by the CO/CO2 mixture are higher. It was found that the formation and aggregation of Fe on the surface of dust particles hinders the diffusion of reducing gas affecting the reduction of remained ZnO inside it.Speeding up the reduction of ZnO with control of the reduction of FeO is the key subject for increasing the ZnO recycling rate.
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