烧结矿/兰炭混装还原试验研究

Experimental study on semi-coke charging with sinter in blast furnace condition

为了降低炼铁生产成本、优化炉料结构以及充分利用低品质冶金焦资源,在实验室条件下进行兰炭用于高炉炼铁的矿焦混装初步试验研究。采用综合热分析仪研究兰炭的基础特性,并模拟高炉条件下的矿焦混装程序还原过程。结果表明,兰炭与CO2的反应性要好于焦炭,兰炭可明显降低烧结矿直接还原的起始温度并加快还原速率;在高炉还原条件下,兰炭可以降低大块焦的溶损率,提高烧结矿的还原度;增加兰炭加入量,烧结矿的还原度相应提高;在兰炭加入量相同的条件下,兰炭和烧结矿分层混装时烧结矿终点还原度较高;过多增加兰炭加入量和改变矿焦混装方式对抑制大块焦溶损率的作用较小。

In order to reduce iron-making cost ,optimize the burden structure and make full use of low-quality metallurgical coke resources ,a preliminary experimental study was conducted on semi-coke and ore mixed charging for blast furnace iron-making in the laboratory .The fundamental properties of semi-coke were characterized by TG method and the programmed reduction under the blast furnace condition was simulated .It is found that semi-coke has better reactivity with CO 2 than ordinary met-allurgical coke .The initial direct reduction temperature of sinter and semi-coke powder mixture can be lowered and the reduction rate is faster .When the mixed sinter and semi-coke is reduced under the blast furnace condition , the solution loss of lump coke is reduced and the reduction rate is raised thanks to the charging of semi-coke .More semi-coke charging can lead to a high sinter reduction rate , and the layered charged semi-coke has better performance in the lump coke protection and sinter re-duction .However ,the overall amount of semi-coke and packing mode have little influence on further suppression of solution loss of lump coke .