Abstract

Significance of the research on the metal recovery from the oxide melts is primarily associated with pyrometallurgical treatment of ferrous and non-ferrous metal ores. The main task of the oxidized nickel ore treatment process is to increase the extraction of the valuable metals with the required (10–20%) nickel content in the ferronickel and the minimal amount of admixtures. According to thermodynamic simulation methods, we evaluate the indicators obtained at iron and nickel recovery from the oxide melt. We performed two series of calculations. In the first one, we varied the working body composition against the amount of iron and nickel oxides at the constant C_FeO/C_NiO ratio equal to 10. In the second one, at the constant C_NiO content equal to 1.8%, we varied the C_FeO value for the C_FeO/C_NiO ratios from 10 to 20. The dosed increase of the CO amount in the working body made it possible to trace the compositions changes in the oxide (C_MеO) and the metal (C_Mе) melts, as well as the degrees of nickel (φ_Ni) and iron (φ_Fe) transition to the metal state. We present the C_NiO, φ_Ni = f(C₀, V_CO) correlation dependencies in the form of the second order polynomials. The φ_Ni and the φ_Fe indicators are changed with the introduced reducing agent amount, but depend insufficiently on the initial condensed phase composition. Those are the element contents in the initial melt and the amount of the introduced reducing agent that affect the composition of the formed Fe–Ni alloy. High (65–90%) nickel content is the specific alloys feature. The φ_Ni value of about 98% was achieved at the introduced CO amount of about 80 m³ per melt ton. In that case, the iron recovery degree is within 5%. At the C_FeO/C_NiO ratio equal to 10, the nickel content in the alloy is in fact independent of its oxide content in the initial ore melt and is close to 65%. A C_FeO/C_NiO ratio increase from 10 to 20 results in the C_Ni decrease from 68.5 to 52.9%, respectively. The data obtained are significant for substantiation of the technology of treatment the low-quality oxidized nickel ores aimed at release of the required ferronickel composition.

中文翻译：

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从氧化物熔体中回收铁和镍的热力学模拟

摘要

从氧化物熔体中回收金属的研究意义主要与黑色金属和有色金属矿石的火法冶金处理有关。氧化镍矿处理工艺的主要任务是提高有价金属的提取率，使镍铁中的镍含量达到所需（10-20%），并且掺合料最少。根据热力学模拟方法，我们评估了从氧化物熔体中回收铁和镍时获得的指标。我们进行了两个系列的计算。在第一个中，我们在恒定C _FeO / C _NiO比率等于 10 时根据铁和氧化镍的量改变工作体成分。在第二个中，在恒定C _{NiO 下}当含量等于 1.8% 时，我们将C _FeO / C _NiO比率的C _FeO值从 10 改变为 20。工作体中 CO 量的剂量增加使得追踪氧化物（C _MеO ) 和金属 ( C _Mе ) 熔化，以及镍 (φ _Ni ) 和铁 (φ _Fe ) 过渡到金属态的程度。我们提出了C _NiO , φ _Ni = f ( C ₀ , V _CO) 二阶多项式形式的相关依赖关系。φ _Ni和φ _Fe指标随引入的还原剂量而变化，但不充分依赖于初始凝聚相组成。这些是初始熔体中的元素含量和引入的还原剂的量，它们会影响所形成的 Fe-Ni 合金的成分。高 (65–90%) 镍含量是合金的特定特征。在每熔体吨约80m ^{3 的}CO引入量下实现约98%的φ _Ni值。在这种情况下，铁回收度在5%以内。在C _FeO / C _NiO当比率等于 10 时，合金中的镍含量实际上与其在初始矿石熔体中的氧化物含量无关，接近 65%。甲Ç_的FeO / ç_的NiO为10〜20的结果中的比例增加Ç_的Ni分别从68.5下降到52.9％。获得的数据对于证实旨在释放所需镍铁成分的低质量氧化镍矿的处理技术具有重要意义。