Study on the New Melting Process of Iron-and Steel-making Dust

炼钢烟尘熔炼新工艺研究

• 批准号: 11691142
• 负责人: YAGI Jun-ichiro
• 金额: $ 7.81万
• 依托单位: Tohoku university
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11691142/
• 关键词: Steelmaking Process; Cold Pellet; Reduction Rate; Swelling; Zinc Separation; Electric Arc Furnace Dust; Sub micron Particle; Coke Filter

Brazilian cooperative researchers studied physico-chemical properties of dusts generated in both BF ironmaking and EAF processes. For the former which does not contain zinc, cold bonded pellets having carbonaceous materials, produced from the dust are reported to have enough strength and reducibility as well as no swelling and broken out therefore being proved as sound raw materials for both gas reduction and smelting reduction processes.For the EAF dust which contains considerable quantity of the complex spinel of (Zn, Fe, Mn)Fe_2O_4, strength and reducibility have been studied. As the results, abnormal swelling was found to occurs when it was heated to 1060C, 95%Zn was removed when it was heated over 1200C, and about 70% Zn was vaporized as ZnO and concentrated in dust when it was processed in smelting reduction. The crude zinc obtained can be used as raw materials for zinc smelting.Cooperative researchers in Japanese side are developing a coke filter process for the separation of zi … More nc from iron. In this method, zinc contained in the EAF dust as complex spinel structure can be evaporated in coke moving bed heated over 1000 C and recovered as liquid zinc in a condenser. On the other hand iron is reduced in the coke bed in solid state and discharged together with coke and recovered in conventional or smelting reduction ironmaking processes.Behavior of over micron particles has been studied in our lab. resulting in high efficiency separation by using a coke packed bed. However, EAF dust contains high quantity of sub micron particles. In this study, we investigated filtration of such sub micron particles by using a cold model of the coke filter process. However, complete result has not yet obtained.In addition, a fundamental study has been made on the recovery of thermal energy from molten slag together with uniformly sized fine slag particles applying chemical reaction. Atomization of wax was studied by using a quasi-hot model of a rotating cup-atomizer and atomization of high temperature molten slag has also tested. Fine particles of considerably uniform size (about 0.7mm) were obtained for wax atomization and fine particles were also obtained for slag pulverization, which provided a positive basis for developing a practical process. Less

巴西教练研究人员研究了BF熨烫和EAF工艺中产生的灰尘的物理化学特性。 For the former which does not contain zinc, cold bonded pellets having carbonaceous materials, produced from the dust are reported to have enough strength and reduction as well as no swelling and broken out therefore being proven as sound raw materials for both gas reduction and smelting reduction processes.For the EAF dust which contains consideration quantity of the complex spinel of (Zn, Fe, Mn)Fe_2O_4, strength and reduction have been studied.由于结果，当将其加热至1060℃时，发现异常肿胀发生，在1200°C上加热时将其去除95％的Zn，并在燃气减少时将约70％的Zn蒸发为ZnO并在粉尘中浓缩。获得的粗锌可以用作锌冶炼的原材料。日本一侧的合作研究人员正在开发一种可乐滤波器工艺，以将Zi的分离……更多的NC与铁与铁的分离。在这种方法中，可以将EAF粉尘中的锌作为复杂的尖晶石结构蒸发在焦炭床中，并在1000°C上加热并在冷凝器中恢复为液体锌。另一方面，铁在固态的焦炭床中减少，并与可乐一起排放，并在常规或冶炼还原熨斗过程中恢复。通过使用可乐床床，从而导致高效率分离。但是，EAF尘埃包含大量的亚微米颗粒。在这项研究中，我们使用可乐滤波器过程的冷模型研究了此类亚微米颗粒的过滤。然而，尚未获得完整的结果。此外，已经对从熔炉中恢复热能以及均匀尺寸的细矿石颗粒的基本研究进行了研究。蜡的雾化是通过使用旋转杯子式注射器的准热模型进行研究的，并且还测试了高温熔炉的雾化。对于蜡雾化，获得了被认为均匀尺寸的细颗粒（约0.7mm），并获得了细颗粒以进行矿渣粉碎，这为开发实际过程提供了积极的基础。较少的