赤泥
铝土矿
吨
拜耳法
原材料
环境科学
废物管理
危险废物
炼钢
制浆造纸工业
化学
材料科学
冶金
工程类
有机化学
作者
Matic Jovičević‐Klug,Isnaldi Rodrigues de Souza Filho,Hauke Springer,Christian Adam,Dierk Raabe
出处
期刊:Nature
[Springer Nature]
日期:2024-01-24
卷期号:625 (7996): 703-709
被引量:31
标识
DOI:10.1038/s41586-023-06901-z
摘要
Abstract Red mud is the waste of bauxite refinement into alumina, the feedstock for aluminium production 1 . With about 180 million tonnes produced per year 1 , red mud has amassed to one of the largest environmentally hazardous waste products, with the staggering amount of 4 billion tonnes accumulated on a global scale 1 . Here we present how this red mud can be turned into valuable and sustainable feedstock for ironmaking using fossil-free hydrogen-plasma-based reduction, thus mitigating a part of the steel-related carbon dioxide emissions by making it available for the production of several hundred million tonnes of green steel. The process proceeds through rapid liquid-state reduction, chemical partitioning, as well as density-driven and viscosity-driven separation between metal and oxides. We show the underlying chemical reactions, pH-neutralization processes and phase transformations during this surprisingly simple and fast reduction method. The approach establishes a sustainable toxic-waste treatment from aluminium production through using red mud as feedstock to mitigate greenhouse gas emissions from steelmaking.
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