通过氢还原金属氧化物粉末混合物合成铜镍合金和铁镍合金

IF 2.5 3区 材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Arun Kamalasekaran, Pelle Mellin, Christopher Hulme
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引用次数: 0

摘要

绝大多数金属生产都以使用碳作为还原剂和/或加热燃料为基础。这导致了大量的二氧化碳排放,为限制全球变暖,应尽量减少这种排放。在这项研究中,使用氢气作为还原剂,通过还原 Cu2O-NiO 和 Fe2O3-NiO 粉末的混合物,一步法生产出了不同成分的铜镍合金和铁镍粉末。还原过程在水平管式炉中进行,温度为 700 ℃,时间为 45 分钟。所有加工过程都是在固态下进行的,合金是直接从元素金属氧化物中生产出来的。使用气体分析仪对废气进行分析,测量含水量以跟踪还原过程的进展。当废气中的含水量与引入氢气前的水平一致时,即宣布还原完成。铜镍合金和铁镍合金均已成功生产。X 射线衍射测量法证实了产品中不存在氧化物,而固相的存在与相关的二元相图一致。在扫描电子显微镜下进行的能量色散 X 射线光谱分析显示,每种粉末混合物在还原后直接达到预期成分的宏观均匀性,微观波动在几个质量百分点的数量级,在典型铸造过程中观察到的波动范围内。这些令人鼓舞的结果值得进一步研究,以便将这一概念应用到更多化学物质中,并将该工艺扩大到中试规模。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis of Copper–Nickel and Iron–Nickel Alloys by Hydrogen Reduction of Mixtures of Metal Oxide Powders

Synthesis of Copper–Nickel and Iron–Nickel Alloys by Hydrogen Reduction of Mixtures of Metal Oxide Powders

The vast majority of metals production is based on the use of carbon as a reductant and/or a heating fuel. This results in a large amount of carbon dioxide emissions and should be minimized to limit global warming. In this study, powders of copper–nickel alloy and iron–nickel of varying compositions were produced in a single step by reduction of mixtures of Cu2O-NiO and Fe2O3-NiO powders, respectively, using hydrogen as a reductant. Reduction was performed in a horizontal tube furnace at 700 °C for 45 min. All processing was in the solid state and alloys were produced directly from elemental metal oxides. Exhaust gases were analyzed using a gas analyzer to measure the water content to track the progress of the reduction. Reduction was declared complete when the water content in exhaust gases matched the level before hydrogen was introduced. Both copper–nickel and iron–nickel alloys were produced successfully. X-ray diffractometry confirmed the absence of oxides in the product and the presence of solid phases in agreement with the relevant binary phase diagram. Energy-dispersive X-ray spectroscopy in a scanning electron microscope showed macroscopic homogeneity at the expected composition for each powder mixture directly after reduction, with microscopic fluctuations of the order of several mass percent, within the limits of fluctuations observed following typical casting processes. These promising results warrant further investigation to apply this concept to more chemistries and to scale up the process to a pilot scale.

Graphical Abstract

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来源期刊
Journal of Sustainable Metallurgy
Journal of Sustainable Metallurgy Materials Science-Metals and Alloys
CiteScore
4.00
自引率
12.50%
发文量
151
期刊介绍: Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.
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