Article
Environmental Studies
Bo Ren, Huajiao Li, Xingxing Wang, Jianglan Shi, Ning Ma, Yajie Qi
Summary: This paper examines the flow of embodied minerals within China and the characteristics of mineral supply between China's provinces and other countries or regions using a nested multiregional input-output model. The study identifies key trade partners and nodes in the mineral supply chain network and uses cascading failure analysis to understand the impact of changes in imports and exports on the overall flow of embodied minerals. This research provides a theoretical basis and references for the formulation of resource and supply security policies.
Article
Geochemistry & Geophysics
Beatrix M. Heller, Silvana Bressan Riffel, Thierry Allard, Guillaume Morin, Jean-Yves Roig, Renaud Coueffe, Geoffrey Aertgeerts, Alexis Derycke, Claire Ansart, Rosella Pinna-Jamme, Cecile Gautheron
Summary: The dynamics of tropical weathering through time and its association with climatic and geodynamic forcing in the formation of laterite and its long-term evolution are studied. The study focuses on lateritic-bauxitic duricrusts from Kaw mountain in French Guiana and investigates their mineralogy, geochemistry, and (U-Th)/He geochronology. The results reveal the heterogeneity in the formation and evolution of duricrust through processes of dissolution and (re)precipitation of Fe (oxyhydr)oxides. The intensification of weathering and shift towards bauxitic conditions since the end of the Miocene are indicated by the dissolution and (re)precipitation of Fe minerals, Al-substitution in goethite, and the overall enrichment in Th. The study proposes a model of lateritization since at least 30 Ma and bauxitization since the late Miocene, providing new insights into the timescale and intensity of weathering in the region.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Review
Environmental Sciences
Benjamin A. Black, Leif Karlstroim, Tamsin A. Mather
Summary: Major environmental disruptions in Earth's history are often associated with large igneous provinces (LIPs), which involve mantle melting, magmatic activity, and volatile release. Understanding the evolution of LIPs is crucial for unraveling the connections between crustal magmatism, gas release, and environmental changes. Studying the mechanisms of LIPs can provide insights into how large-scale magmatic systems interact with the lithosphere and influence environmental shifts.
NATURE REVIEWS EARTH & ENVIRONMENT
(2021)
Article
Geology
Hui Qi, Neng Gong, Sheng-Qiang Zhang, Jun Li, Guo-Li Yuan, Xue-Fei Liu
Summary: This review focuses on the occurrence state and enrichment mechanism of gallium in bauxite, specifically in lateritic bauxite and karstic bauxite. It reveals that gallium in lateritic bauxite is mainly present in the form of ion adsorption, while in karstic bauxite, it predominantly exists as isomorphism in aluminum minerals. The study provides valuable insights for future research.
ORE GEOLOGY REVIEWS
(2023)
Article
Green & Sustainable Science & Technology
Li Yang, Jianhui Liu, Xianwei Ma, Xiang Hu, Zemei Wu, Caijun Shi
Summary: By introducing the concept of initial voids and controlling the gas release, the bloating of LWA can be achieved, leading to the successful design and production of functional LWA with desirable engineering properties.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Engineering, Environmental
Fei Lyu, Yuehua Hu, Li Wang, Wei Sun
Summary: The review provides a comprehensive overview of the composition characteristics, processing methods, and management strategies of bauxite residue, emphasizing the importance and complexity of dealkalization. It is recommended to select appropriate treatment methods based on the characteristics of bauxite residue and regional resources.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
Hong Peng, Ngoc Quy Vu, James Vaughan, Sicheng Wang, Shuai Gao
Summary: In this study, bauxite residue samples were treated with aqueous HCl solutions to investigate the dissolution kinetics, ion exchange, and adsorption performance. XRD, XPS, and SEM measurements were used to determine the reaction mechanisms. The results showed that the adsorption performance decreased with increasing acid concentrations, mainly due to the structural changes of the sodalite phase. Other mineral phases had a minor contribution to the adsorption. Furthermore, different adsorption mechanisms were revealed for Pb2+ and Cu2+, which were related to surface disruption.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Adamantia Lazou, Casper van der Eijk, Kai Tang, Efthymios Balomenos, Leiv Kolbeinsen, Jafar Safarian
Summary: Metallurgical grade alumina is produced globally through the Bayer process, generating bauxite residue in the form of red mud. This study focuses on valorizing bauxite residue through a smelting-reduction process to obtain calcium aluminate slags for alumina recovery. The research examines the characteristics and thermodynamics of the slags and pig iron produced from mixtures of bauxite residue, bauxite beneficiation byproduct, and lime, highlighting the influence of cooling rate on slag characteristics and element distribution.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
S. Dyussenova, R. Abdulvaliyev, A. Akcil, S. Gladyshev, A. Manapova
Summary: The current study investigates preliminary chemical activation to transform phase composition and remove silicon effectively before gravitational concentration, aiming to obtain suitable raw material for alumina production. Chemical activation of bauxite resulted in phase composition changes and increased beneficiation degree. Further chemical treatment is needed to obtain high-quality bauxite concentrate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Environmental
Li-chun Jiang, Bin-bin Shen, Luan-luan Xue
Summary: This study establishes a structural mechanical model for cracked strip pillars and determines a mathematical formula for total energy. An analytical method for estimating the critical blasting load is derived, showing that the stability of cracked strip pillars is influenced by multiple factors, with pillar height having a significant impact on q(cr). The proposed method is validated using numerical results and a case study.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Agronomy
Ying Guo, Xianchao Zhang, Xinfeng Qin, Yifan Jiang, Feng Zhu, Shengguo Xue
Summary: Different organic amendments were applied to bauxite residue, with corn straw treatment showing the highest humification rate and nitrohumic acid treatment having a higher degree of humification but limited microbial activity. The method of handling bauxite residue has a significant impact on humification characteristics.
Article
Geosciences, Multidisciplinary
Qiang Jiang, Fred Jourdan, Hugo K. H. Olierook, Renaud E. Merle
Summary: Large igneous provinces (LIPs) are important for plate tectonics, environmental crises, and resource formation. The study of LIPs' ages is crucial for understanding their duration and relationship with other geological events. However, the reliability and precision of dating results need to be critically evaluated.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Ali Abedini, Giovanni Mongelli, Maryam Khosravi
Summary: In the Irano-Himalayan karst bauxite belt in Iran, the early Jurassic Soleiman Kandi karst bauxite deposit is characterized by a mineral assemblage of diaspore, hematite, kaolinite, and rutile. The data suggests that the orebodies share a common origin from a mafic protolith. Factors such as redox fluctuations and clay minerals play a significant role in controlling the distribution of certain elements in the bauxite ores.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2022)
Article
Construction & Building Technology
O. Alelweet, S. Pavia
Summary: The study found that bauxite has good pozzolanic and hydraulic capacity, making it suitable as a binder in construction materials. Bauxite exhibits high pozzolanic activity and mechanical performance, with a superior specific surface area compared to other pozzolanic and cementing materials. Heating bauxite significantly increases its specific surface area and enhances its pozzolanic activity. Evaluation methods showed that bauxite fired at 550°C has the highest pozzolanic activity, while bauxite fired at 700-800°C has the highest reactivity.
JOURNAL OF BUILDING ENGINEERING
(2022)
Review
Environmental Sciences
Yang Chen, Ting-an Zhang, Guozhi Lv, Xi Chao, Xuewei Yang
Summary: Bauxite is an ideal raw material for alumina production, containing valuable elements that can be recovered to improve efficiency and reduce environmental impact. This study analyzes the technology used to recover valuable elements from bauxite residue and circulating spent liquor.
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2022)
