温度对含锌高炉瓦斯灰烧结的影响

Effect of Temperature on the Sintering of Zn-bearing Blast Furnace Gas Ash

高炉瓦斯灰是一种产量大、富含铁和碳且极具回收利用价值的二次资源。为了研究温度对含锌高炉瓦斯灰烧结的影响,采用ICP、DTA-TG、XRD和SEM-EDS等手段对山西某钢铁厂的高炉瓦斯灰在不同温度烧结过程中的物相、微观结构及元素含量变化进行了研究。结果表明:高炉瓦斯灰中铁和锌元素主要集中在细颗粒中,碳元素主要集中在大颗粒中;随着烧结温度的升高,高炉瓦斯灰中某些不稳定的无定形物质减少,稳定的硅酸盐类物质占比增大;颗粒逐渐变大,有明显聚集成块的趋势;铁元素含量增加,锌元素含量先增加后减小至0.5%,碳元素含量急剧下降至8.4%后减少变得缓慢。该研究对高炉瓦斯灰的高效利用具有一定的理论指导意义。

Blast furnace gas ash is a kind of secondary utilization resource with large output,much iron,carbon and highly recycling value.In order to study the effect of temperature on the sintering of Zn-bearing blast furnace gas ash,the phase change,microstructure change and the change of elemental content of blast furnace gas ash in a iron and steel plant of Shanxi during sintering at different temperatures were studied by means of ICP,DTA-TG,XRD,SEM-EDS and other means.The results show that iron element and zinc element in the blast furnace gas ash are mainly concentrated in the fine particles,carbon element is mainly concentrated in large particles;with the increase of sintering temperature,some unstable amorphous materials in blast furnace gas ash decrease,and the proportion of stable silicate substances increases;particles become larger,there is a clear trend of agglomeration;iron element content increases,zinc content increases first and then decreases to 0.5%.After the carbon element content drops sharply to 8.4%,the decrease becomes slow.This research has certain theoretical significance for the efficient utilization of blast furnace gas ash.