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Abstract：
This study investigated lignin as a reducing agent instead of fossil carbon for the reduction of zinc oxide and zinc ferrite contained in steelmaking dusts. Three types of dusts from different steelmaking processes were considered: ferrochrome converter (CRC), electric arc furnace stainless steel (EAFSS) and electric arc furnace carbon steel (EAFCS). Zinc is primarily found in zincite phases within CRC dust, while EAFSS and EAFCS dusts contain franklinite and zincite phases as Zn-bearing minerals. The proximate analysis of lignin showed that the fixed carbon content is 28.9%. Thermogravimetric (TG) analysis coupled with differential scanning calorimetry (DSC) and mass spectrometry (MS) was used to study the reduction behavior of different mixtures of lignin and steel dusts under inert and air atmospheres. Simultaneously, the minimum ratio of lignin out of three different proportions required to achieve a complete reduction of franklinite and zincite phases into metallic zinc was identified. The results indicated that a 1.1 stoichiometric amount of lignin is sufficient for the complete reduction of zinc-bearing minerals into metallic zinc. In conclusion, lignin can be used efficiently for processing steelmaking dusts.
摘要：
这项研究研究了木质素作为还原剂而不是化石碳，用于还原炼钢粉尘中的氧化锌和铁酸锌。考虑了来自不同炼钢过程的三种类型的粉尘：铬铁转炉（CRC），电弧炉不锈钢（EAFSS）和电弧炉碳钢（EAFCS）。锌主要存在于CRC粉尘中的锌矿相中，而EAFSS和EAFCS粉尘中含有含锌矿物的钙铝矿和锌矿相。木质素的近似分析表明,固定碳含量为28.9%。使用热重（TG）分析与差示扫描量热法（DSC）和质谱（MS）相结合，研究了木质素和钢尘的不同混合物在惰性和空气气氛下的还原行为。同时,确定了木质素在三种不同比例中的最小比例，以实现将钙铝石和锌矿相完全还原为金属锌所需的比例。结果表明，1.1化学计量的木质素足以将含锌矿物完全还原成金属锌。总之,木质素可以有效地用于处理炼钢粉尘。
