Abstract

Ferronickel, currently obtained from oxidized nickel ores in various aggregates, contains from 5 to 20% of Ni. According to experiments, rich ferronickel (with a content of Ni of about 70%) can be obtained from the melt of silicate-nickel ore treated with reducing gas. The thermodynamic modeling of metallurgical processes, adapted to open systems, is used to consider the features of reducing the high-iron nickel ore from the Serovskoye deposit with carbon monoxide. The oxide melt composition used for the calculations includes 60.4 wt % of Fe₂O₃, 1.4 wt % of NiO, 0.14 wt % of СоО, 5.8 wt % of А1₂O_3, 17 wt % of SiO₂, 4.2 wt % of MgO, and 11.1 wt % of CaO. The simulation was carried out at a pressure of 0.1 MPa, an amount of carbon monoxide of 10.6 dm³/kg per portion, and temperatures of 1673, 1723, 1773 K. During calculations, dependencies are found that connect the content of nickel (C_NiO), iron (\({{C}_{{{\text{F}}{{{\text{e}}}_{2}}{{{\text{O}}}_{3}}}}},\) \({{C}_{{{\text{F}}{{{\text{e}}}_{3}}{{{\text{O}}}_{4}}}}},\) C_FeO) and cobalt (С_СoО) oxides in the oxide melt and metals in the alloy (С_Ni, С_Fe, С_Co), as well as their transition degree from the metallic state (φ_Ni, φ_Fe , φ_Co) to the amount of introduced gas. The component contents in one portion of reduced metal are determined. At temperatures of 1673 to 1773 K and an introduced amount of CO of 190 dm³/kg, the respective content of Fe₂O₃, Fe₃O₄, FeO, NiO, and CoO in the oxide melt is 0.17 to 0.12%, 1.77 to 1.05%, 55.6 to 56.5%, 0.026 to 0.037%, and 0.061 to 0.068%. At a nickel reduction degree of 98%, the respective degrees of iron and cobalt reduction are 5 and 56 to 61%. An alloy formed from the reduced metals contains about 30% of Ni, 63 to 65% of Fe and 2% of Co. Thus, it is shown that the selective reduction of nickel and cobalt is possible in certain conditions. The findings from the study are significant to validating the parameters of the production process of ferronickel from oxidized high-iron nickel ores.

中文翻译：

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氧化高铁镍矿石熔体还原金属的热力学模型

摘要

目前从各种聚集体的氧化镍矿石中获得的镍铁含有5至20％的镍。根据实验，可以从用还原性气体处理过的硅酸镍矿石的熔体中获得富镍铁（Ni含量约为70％）。冶金工艺的热力学模型适用于开放系统，用于考虑使用一氧化碳还原Serovskoye矿床中的高铁镍矿石的特征。熔化用于计算组合物含有Fe 60.4％（重量）氧化₂ ö ₃，氧化镍的1.4％（重量），СоО的0.14％（重量），的А15.8重量％的₂ ö _3，二氧化硅的17％（重量）₂，4.2 wt％的MgO和11.1 wt％的CaO。模拟是在0.1 MPa的压力，每部分的一氧化碳量为10.6 dm ³ / kg，温度为1673、1723、1773 K的条件下进行的。在计算过程中，发现了将镍（C _NiO），铁（\（{{C} _ {{{\ text {F}} {{{\ text {e}}} _ {2}} {{{\ text {O}}} __ {3} }}}}，\） \（{{C} _ {{{\ text {F}} {{{\ text {e}}} _ {3}} {{{\ text {O}}} __ { 4}}}}}，\） ç_的FeO）和钴（С _СoО）在氧化物的氧化物熔化并在合金金属（С_镍，С_铁，С _{ç Ò}），以及从所述金属态的（φ它们的转变程度_的Ni，φ_的Fe，φ_钴），以引入的气体的量。确定一份还原金属中的成分含量。在1673至1773 K的温度和190 dm ³ / kg的CO引入量下，Fe ₂ O ₃，Fe ₃ O ₄各自的含量氧化物熔体中的FeO，NiO和CoO为0.17〜0.12％，1.77〜1.05％，55.6〜56.5％，0.026〜0.037％，0.061〜0.068％。在镍还原度为98％时，铁和钴的还原度分别为5％和56％至61％。由还原金属形成的合金包含约30％的Ni，63％至65％的Fe和2％的Co。因此，表明在某些条件下可以选择性地还原镍和钴。该研究结果对验证氧化高铁镍矿石生产镍铁的工艺参数具有重要意义。