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分析了高炉瓦斯泥、布袋除尘灰和转炉污泥三种粉尘的化学组成、粒度组成和物相分布等物化性质。用热力学软件Factsage验证了还原脱锌的可行性,并通过TG-DSC试验确定了反应的初始温度。进而试验考察了还原气氛、温度、时间、C/O对粉尘脱锌率和金属化率的影响。结果表明:粉尘球团可以在弱氧化气氛下进行还原,粉尘球团的脱锌率和金属化率随温度、时间的增加而升高。在球团C/O=1.1,还原温度为1 300℃下还原40 min后,球团的金属化率大于85%,脱锌率大于95%。
The chemical composition, particle size distribution and phase distribution of blast furnace gas mud, bag dust and converter sludge were analyzed. The thermodynamic software Factsage verified the feasibility of reducing dezincification and determined the initial reaction temperature by TG-DSC test. Furthermore, the effects of reducing atmosphere, temperature, time and C / O on the dezincification rate and metallization rate of dust were investigated experimentally. The results show that the dust pellets can be reduced in a weak oxidizing atmosphere, and the dezincification rate and the metallization rate of the pellets increase with the increase of temperature and time. After the pellets were reduced for 40 min at a C / O of 1.1 and a reduction temperature of 1300 ℃, the metallization rate of the pellets was more than 85% and the dezincification rate was more than 95%.