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在实验室条件下模拟转底炉工艺,进行了钒钛磁铁矿含碳球团直接还原实验。运用基于中心组合设计的响应曲面法对影响钒钛磁铁矿含碳球团金属化率的主要影响因素进行了研究并优化。研究结果表明:焙烧温度对球团金属化率的影响最显著,焙烧时间次之,配碳比(wC/wO)影响最小。通过分析实验结果,建立了球团金属化率的二次多项式模型,模型预测的最佳工艺参数为:焙烧温度1 350℃,焙烧时间35.14 min,配碳比1.25。在最佳工艺条件下进行验证实验,发现实际金属化率与预测的金属化率具有良好的一致性,相对误差仅为0.87%。
Under laboratory conditions, the process of the rotary hearth furnace was simulated and the direct reduction experiment of carbon-containing pellets of vanadium-titanium magnetite was carried out. The response surface methodology based on central composite design was used to study and optimize the main influential factors that affect the metallization rate of vanadium - titanium magnetite pellets. The results show that the calcination temperature has the most significant influence on the metallization rate of the pellets, followed by the calcination time with the smallest ratio of carbon to carbon (wC / wO). By analyzing the experimental results, the quadratic polynomial model of the pellet metallization rate was established. The optimum technological parameters of the model were as follows: the calcination temperature was 1 350 ℃, the calcination time was 35.14 min and the carbon ratio was 1.25. The verification experiment under the best technological conditions showed that the actual metallization rate was in good agreement with the predicted metallization rate with a relative error of only 0.87%.