Abstract

The coreduction of iron and zinc from the B₂O₃–CaO–FeO–ZnO oxide melt by carbon monoxide or hydrogen is described by means of thermodynamic simulation in approximation to real processes; it provides batch addition of a reducing gas and removal of a metallic phase and waste gases. The calculations are carried out with allowance for the disproportionation of FeO into Fe and Fe₃O₄. For a mass ratio FeO/ZnO = 10, the disproportionation of FeO ensures the transition of 1.3–1.5 wt % Zn into gas. Upon addition of hydrogen or carbon monoxide to the system, the oxide melt composition is modified: the fractions of iron and zinc oxides decrease, but the degree of their metallization (φ_Fe, φ_Zn) increases. Complete (>99%) transition of zinc into a gas phase at 1773 K and 1673 K is detected upon addition of hydrogen in an amount of 36 and 65 dm³/kg, respectively, or of carbon monoxide in an amount of 58 and 80 dm³/kg, respectively. When hydrogen is used, the degree of iron metallization reaches 24.0–15.8% in the temperature range 1337–1573 K against 11.0–6.0% for carbon monoxide. The temperature increment in the considered V_CO and \({{V}_{{{{{\text{H}}}_{2}}}}}\) flow rate ranges decreases the degree of metallization φ_Fe. The obtained data can be used to adjust the conditions of treatment of oxide (slag) melts and to achieve the required degrees of metallization of zinc and iron.

中文翻译：

---

氢气和一氧化碳从 B2O3–CaO–FeO–ZnO 熔体中还原金属的热力学模拟

摘要

_{B 2} O ₃ –CaO–FeO–ZnO 氧化物熔体中的铁和锌被一氧化碳或氢气共还原，通过热力学模拟描述了近似真实过程的过程；它提供了还原气体的批量添加以及金属相和废气的去除。计算时考虑到 FeO 歧化为 Fe 和 Fe ₃ O ₄。对于质量比 FeO/ZnO = 10，FeO 的歧化确保了 1.3-1.5 wt% 的 Zn 转变为气体。向系统中加入氢气或一氧化碳后，氧化物熔体成分会发生变化：铁和氧化锌的比例降低，但它们的金属化程度（φ _Fe , φ _Zn) 增加。^{在分别添加 36 和 65 dm 3} /kg 的氢气或 58 和 80 的一氧化碳时，检测到锌在 1773 K 和 1673 K 时完全（>99%）转变为气相分米³ /公斤，分别。当使用氢气时，铁金属化程度在 1337-1573 K 温度范围内达到 24.0-15.8%，而一氧化碳为 11.0-6.0%。所考虑的V _CO和\({{V}_{{{{{\text{H}}}_{2}}}}}\)流速范围内的温度增量降低了金属化程度 φ _Fe。获得的数据可用于调整氧化物（熔渣）熔体的处理条件，并达到所需的锌和铁金属化程度。