Environmental Science and Pollution Research, volume 30, issue 15, pages 43377-43386
Red mud recycling by Fe and Al recovery through the hydrometallurgy method: a collaborative strategy for aluminum and iron industry
Xiaolong Liu
1
,
Yang Zou
1, 2
,
Ran Geng
3
,
Bin Li
3
,
Tingyu Zhu
1, 4
1
CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, China
|
4
Institute of Urban Environment, Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen, China
|
Publication type: Journal Article
Publication date: 2023-01-19
scimago Q1
SJR: 1.006
CiteScore: 8.7
Impact factor: —
ISSN: 09441344, 16147499
General Medicine
Environmental Chemistry
Health, Toxicology and Mutagenesis
Pollution
Abstract
In this work, a collaborative strategy for the aluminum and iron industry based on red mud recycling through the hydrometallurgy method was proposed. In this method, Fe3+ and Al3+ were firstly separated from the red mud by using H2SO4 as a leaching agent, which was by-produced from the sintering process of an iron and steel industry. Multiple influence factors on the leaching process were investigated, with the H2SO4 addition amount showing the strongest influence on the leaching rates of Al and Fe. The main components of the filter residue were CaSO4, TiO2, and SiO2, which could be reused as additives in the building materials. Subsequently, the final Fe recovery product was obtained through the co-precipitation, Fe/Al separation, and Fe(OH)3 calcination. In the final product, the content of Fe2O3 reached 82.87%, and the iron grade was 58.01%, meeting the requirement being raw materials for sinter production.
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