Aluminum Production Research Articles

Enhancing Resource Circularity in Aluminum Production through Nanofiltration of Waste Cryolite

Enhancing Resource Circularity in Aluminum Production through Nanofiltration of Waste Cryolite

Different technology packages for aluminium smelters worldwide to deliver the 1.5 °C target

Production of aluminium, one of the most energy-intensive metals, is challenging for mitigation efforts. Regional mitigation strategies often neglect the emissions patterns of individual smelters and fail to guide aluminium producers’ efforts to reduce GHG emissions. Here we build a global aluminium GHG emissions inventory (CEADs-AGE), which includes 249 aluminium smelters, representing 98% of global primary aluminium production and 280 associated fossil fuel-based captive power units. We find, despite the installation of more efficient and higher amperage cells, that the share of aluminium production powered by fossil fuel-based captive power units increased from 37% to 49% between 2012 and 2021. Retiring fossil fuel-based captive power plants 10 years ahead of schedule could reduce emissions intensity by 5.0–10.5 tCO2e per tonne of aluminium for dependent smelters. At least 18% of smelting capacity by 2040 and 67% by 2050 must be retrofitted with inert anode technology to achieve net-zero targets.

Physical–chemical properties and economic–environmental evaluation of paste backfill prepared with solid waste from alumina production

Physical–chemical properties and economic–environmental evaluation of paste backfill prepared with solid waste from alumina production

Removal, conversion and utilization technologies of alkali components in bayer red mud.

Bayer red mud is a highly alkaline industrial solid waste generated during alumina production, and its massive discharge and stockpiling poses significant environmental risks. The strong alkalinity of red mud is a primary challenge limiting its effective utilization. This study systematically analyzes the composition and characteristics of alkaline components in red mud, emphasizing the roles of soluble free alkali and chemically bound alkali in regulating its alkalinity. A comprehensive review of current dealkalization technologies, including acid neutralization, CO2 neutralization, and salt precipitation/replacement methods is presented, focusing on their chemical mechanisms, applicability, advantages, and limitations. Specially, this study present the concept of in-situ conversion and utilization of alkali and highlight the beneficial role of alkali components in red mud recycling. The latest technologies for the conversion and utilization of alkali components, including the special roles and principles of alkali in the reaction processes of cement clinker calcination, cement hydration, geopolymers were systematically summarized. Additionally, the environmental potential of red mud in acid wastewater neutralization and flue gas desulfurization is discussed. This study identifies the technical barriers that need to be solved urgently in the current research and proposes a key direction for future study on the regulation of alkali components in red mud.

A systematic review of the production of high-purity aluminum: Applications, preparation, and mechanisms

A systematic review of the production of high-purity aluminum: Applications, preparation, and mechanisms

Evaluation of solar thermal pretreatment of carbonate-rich manganese ores in high-carbon ferromanganese production through dynamic process modelling

The necessity of reducing greenhouse gas emissions to limit the impact of anthropogenic climate change means that all industrial processes should investigate their options towards decarbonization. Iron, steelmaking, aluminium, and cement production produce the most industrial emissions. Although most research focuses on decarbonizing these industries, minerals processing industries must be decarbonized to achieve net zero emissions goals by 2050. Incorporating renewable energy sources and avoiding the combustion of fossil fuels are two ways to reduce greenhouse gas emissions. This paper reports on the results from a dynamic process model developed to investigate the feasibility of concentrating solar thermal pretreatment of manganese ores to pretreat carbonate-rich manganese ores for increased ferromanganese smelter productivity and reduced greenhouse gas emissions. The results indicate that pretreated ores reduce the energy requirement for smelting significantly for some ores and lowers total carbon dioxide emissions by 13 to 19% compared to the traditional smelting route. A high-level economic evaluation shows that solar thermal treatment is financially viable for low cryptomelane, high braunite ore that is common in the Kalahari Manganese Field.

Development of multifunctional polymer composites with high red mud content

Red mud (RM) is one of the large-scale by-products of alumina production, posing significant environmental challenges due to its high alkalinity, toxicity, and substantial accumulation volumes. The object of this study is polymer composite based on styrene-butadiene aqueous dispersion with RM and chamotte (Pa2) as fillers at high concentrations (up to 90 wt. %). The primary problem addressed in this research is finding effective ways to utilize RM as secondary raw material to enhance its recycling efficiency and create multifunctional materials with adjustable properties. The study established that RM has an irregular plate-like structure with a high active surface area, which facilitates the formation of an open porous composite structure, while Pa2 forms a dense matrix due to its aluminosilicate content. Infrared spectral analysis confirmed the presence of functional groups (OH, Si–O, Al–O) that ensure the interaction of fillers with the polymer matrix. Thermogravimetric analysis demonstrated that RM and Pa2 exhibit similar behavior under heating. Mechanical tests revealed that RM-based composites exhibit high plasticity and energy absorption capacity, whereas Pa2-based composites are characterized by greater stiffness and strength (elastic modulus up to 129.8 MPa). The results indicate that the choice of filler type and concentration effectively regulates composite properties. The proposed approach enables the recycling of industrial waste and the development of multifunctional materials suitable for use in construction, protective coatings, and the production of structural elements capable of withstanding significant loads

Preparation of High‐Selectivity Li+ Adsorbents Based on Bauxite via Liquid‐Phase Alkaline Thermal Activation

ABSTRACTBauxite, as the main aluminium‐bearing mineral in China, is a crucial resource for the industrial production of aluminium and aluminium‐related products. In this study, bauxite‐based aluminium composite Li+ adsorbents were prepared using a liquid‐phase alkaline thermal activation—acid in situ method. The effects of various factors on Li+ adsorption from brine were investigated through single‐factor experiments. Multiple techniques, such as scanning electron microscopy (SEM), energy dispersive x‐ray spectroscopy (EDS), x‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, Fourier transform infrared spectroscopy (FT‐IR), and x‐ray photoelectron spectroscopy (XPS), were employed to characterise and analyse the microstructure, pore size distribution, chemical element distribution, and mineral structure of the adsorbents. In addition, the changes in bauxite structure and properties before and after functionalization were investigated. Results indicate that the adsorption capacity of LATA‐AIS‐LDH‐BX adsorbent prepared by the acid in situ method reached 1.15 mg/g at pH = 7; the adsorption capacity of LATA‐Al‐LDH‐BX adsorbent prepared by the aluminium salt conversion method reached 2.16 mg/g. The adsorption behaviour of both adsorbents followed the pseudo‐second‐order kinetic model and the Langmuir model. In the presence of interfering ions (Na+, K+, SO24+, Mg2+), the composite adsorbents showcased strong selective adsorption capacity for Li+. After five cycles of adsorption–desorption, the adsorption rates decreased by 12.19% and 11.48%, respectively, demonstrating good recycling stability. Furthermore, the Li+ adsorption capacities in salt lake brine reached 0.82 mg/g and 1.48 mg/g, indicating promising potential for industrial application.

Experimental Study on Asphalt by the Partial Replacement of Filler with Red Mud

Transportation is the main means of communication for trade, commerce, and many other purposes. In transportation, the roadway plays a crucial role as it is having more advantages compared to other forms of transportation. In India, the maximum length of the highway network is of bituminous pavements. Bituminous pavement is a general type of bitumen mixture with recommended changes if any. Generally, the bituminous pavement has some failures such as potholes, rutting, cracking, shoving, etc, the major cause of the cracking, shoving, rutting is the lack of adhesion in the bitumen and heavy load vehicles. To solve this issue, we are going to replace the filler material with Bauxite residue in the incremental method from 0% to 25%. This study investigated the strength of the marshall stability specimen. At present NHAI is taking an initiative to construct rigid pavements for highways. Most of the rigid pavements are constructed with cement concrete. It is not always possible to supply cement because of its limited production there is a necessity to go for alternatives. Bauxite residue, also known as red mud, is a byproduct of aluminum production during bauxite processing. In India, this waste is often improperly managed, with large quantities being stored in deforested areas. Each year, around 22 million tons of red mud are produced in India alone, contributing to a global total of approximately 119 million tons annually [1]. By using this red mud in bitumen pavement, we are expecting to improve the marshal stability of the pavement and reduce the cost of the construction. By using this material in rigid pavements, we are expecting to improve the strength, durability of pavement and reduce the cost of construction and environmental pollution. Keywords: Bauxite residue powder (red mud), bitumen pavements, marshal stability, rigid pavements, compressive strength, flexural strength.

Impact of Scrap Impurities on AlSi7Cu0.5Mg Alloy Flowability Using Established Testing Methods

In view of the increasing demand for secondary aluminum, which is intended to partially replace the very energy- and resource-intensive primary aluminum production, effective treatment methods can maintain the high quality level of light metal castings. The transition from a linear to a circular economy can result in an accumulation of oxides or carbides in aluminum. Therefore, melt purification is crucial, especially as foundries aim to increase the use of often dirty end-of-life scrap. Nonmetallic inclusions in the melt can impact its flowability and mechanical properties. As the purity of the melt increases, its flow length also tends to increase. Available assessment methods like reduced pressure test or K-mold are capable of ensuring high levels of purity. This study demonstrates the implication of inclusions originating from dirty scrap. An experimental test run deals with various scrap contents in an AlSi7Cu0.5Mg alloy and shows correlations between impurity and performance, expressed by flowability and mechanical properties. These performance indicators have been connected to inclusion and porosity rates. In conclusion, these findings emphasize the need for further extensive research on contaminants in the field of scrap melting and the development of methods for easy-to-handle assessment methods.

Detecting bubbles in world aluminum prices: Evidence from GSADF test

The aim of this research is to assess the existence of multiple bubbles in the global aluminum market by employing the Generalized Supremum Augmented Dickey-Fuller (GSADF) methodology. This method offers practical time series analysis tools for identifying periods of rapid price escalation, followed by subsequent collapses. Findings indicate the identification of six explosive bubbles occurring between January 1980 and March 2023, during which the aluminum price strayed from its underlying fundamental value. Additionally, this finding is consistent with the asset pricing model, which generally considers both fundamental and bubble components. Based on the empirical results, the aluminum price bubbles are positively influenced by the copper price, GDP, the U. S dollar index, industrialization of China, China’s urbanization rate, whereas the global aluminum production, oil price, and base metal price index have a negative explanatory effect on the aluminum price bubbles. To effectively stabilize the international aluminum price, policymakers are suggested to be vigilant in identifying bubble episodes and monitoring their progression. Additionally, regulatory authorities should implement measures to curb excessive speculative activity during periods of extreme market volatility, thereby mitigating excessive price fluctuations and the formation of aluminum bubbles.

Aluminum Product Surface Defect Detection Method Based on Improved CenterNet

In order to realize real‐time detection of aluminum defects during aluminum production, the target detection algorithm needs to be able to run on locally deployed hardware. Convolutional neural networks can effectively extract representative features from high‐dimensional data such as images and videos, and capture spatial information in the data, making it easier to locate aluminum defects. Moreover, running CNN model inference on local hardware has high real‐time performance. Due to the advantages of convolutional neural network in anomaly detection, an improved CenterNet aluminum surface defect detection method was proposed. The algorithm combines common convolution and depthwise separable convolution to design a lightweight convolution module. Then, the Convolutional Block Attention Module is added to the feature extraction network to make the network better capture the rich input feature information of the image. Ultimately, the α‐DIoU loss function is implemented to enhance the precision of bounding box predictions. The experimental findings demonstrate that the proposed algorithm achieves an average detection accuracy (mAP) of 86.02%, which is 5.95% higher than the average detection accuracy of the traditional algorithm, and has a good detection effect on aluminum surface defects. Furthermore, there is an 11.9% reduction in model parameters and a 15.2% decrease in floating‐point computations, which helps to promote the deployment of embedded device platforms. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

Research in the area of obtaining of activated alumina. Part 7. Production of reactive alumina with controlled particle size distribution

The key technological factors determining the formation of granulometric composition of highly dispersed alpha-alumina powders in the process of thermal treatment of feedstock have been researched. The decisive influence of temperature modes of synthesis and concentration of Cr2O3 additive on phase transformations and structural and morphological characteristics of reactive alumina is shown. The fact of formation of thermodynamically stable primary crystals of alpha aluminum oxide with a characteristic mode of 0.5 μm has been established for the first time. Technological principles of thermal synthesis of reactive alpha-alumina with predictable particle size distribution have been developed.

Eco-efficiency assessment of carbon capture and hydrogen transition as decarbonisation strategies in alumina production

Studies seeking to thoroughly couple the environmental and economic performances of a process or product are becoming more prominent as the needs for decarbonisation grow. This study explores the use of Life Cycle Assessment (LCA) and Life Cycle Costing (LCC) in the alumina extraction industry. Models for various thermal energy supply methods and CO2 mitigation strategies were developed to obtain an inventory for analysis and the environmental impacts and life-cycle costs of the supply chain were evaluated. Finally, economic and ecological results were integrated using eco-efficiency indices and a sensitivity analysis of the most significant variables detected was conducted. The research indicated that the integration of a calcium-looping plant to capture post-combusted CO2 could reduce 55.5% of the CO2 equivalent emissions, while also obtaining a better economic performance due to the CO2 avoided taxes. However, other environmental indicators had slightly more significant impacts because of the additional use of natural gas. The potential use of green hydrogen instead of natural gas could enable a 70.0% reduction in CO2 equivalent emissions, as well as a reduction in all other environmental indicators studied, except for water consumption. However, transitioning to green hydrogen production could incur higher costs. This study introduced an eco-efficiency ratio index, indicating that CO2 capture and storage proved to be the most eco-efficient scenario, regardless of economic fluctuations in CO2 emission taxes. The substitution of natural gas with green hydrogen also emerged as a viable eco-efficient solution, provided electricity prices remain below 0.045€/kWh.

Features of electrolyte coagulation of modified polyamide resin and its effect on the properties of paper and cardboard

The article is devoted to the study of the features of coagulation of a modified polyamide resin for paper and cardboard in the presence of aluminum polyoxychloride. It has been established that the resin under study, the component composition of which is represented by modified polyaminoamides, free resin acid, sodium resinates and maleopimarate, is resistant to water hardness salts, however, the sodium resinates present in its composition are subject to hydrolysis. The process of coagulation of the modified polyamide resin under the influence of aluminum polyoxychloride is multi-stage and ends with the complete deposition of adhesive particles at a system pH of 7.05, which corresponds to an electrolyte consumption of 0.051 g Al2O3/g of resin. The composition of the adhesive deposit formed under such conditions is as follows: aluminum-resin complexes (aluminum resinates and products of the interaction of aluminum ions with modified polyamino- amides) – 88.50 % wt.; free resin acids – 11.47 % wt. Further introduction of the electrolyte into the dispersed system leads to the protonation of the amino groups of modified polyaminoamides and aluminum-resin complexes, which provides with a positive charge. Due to its composition and the ongoing coagulation processes, the modified polyamide resin has a waterrepellent and strengthening effect on paper pulps in a wide pH range (5.8–7.5). Sequential introduction of resin into waste paper suspensions in an amount of 0.25 % of absolutely dry fiber and aluminum polyoxychloride until the paper pulps are achieved makes it possible to improve the hydrophobic and physical-mechanical properties of paper by 70.2–87.2 and 19.5–23.2 %, respectively.

Intelligent control system for technological complexes of aluminum industry enterprises

Relevance. Aluminum production is one of the most important industries all over the world. It has a high environmental load, resource and energy intensity. To reduce the negative impact of aluminum production, efforts are underway to improve its technological processes, aimed at increasing aluminum recovery rates, reducing waste volumes, and lowering energy consumption. The reduction of energy consumption can be achieved, among others, through implementing control systems that provide energy management. Due to the complexity and multiplicity of technological processes in aluminum production, the use of traditional linear approaches for such control systems is ineffective, and adequate mathematical models are required. At the same time, for the production level, the use of mathematical models based on a phenomenological description of the ongoing physical processes overly complicates the control task. As a result, the use of intelligent and adaptive approaches to both the mathematical description of technological processes and the optimal energy consumption management is relevant. Objects. Technological complexes of aluminum production, which have the properties of inertia, nonlinearity, and closedness; and the control system based on artificial intelligence methods. Alumina production is chosen as an illustration. Aim. To develop mathematical models capable of adequately describing the interrelated processes in the technological complexes under consideration, as well as the control system that allows optimal energy consumption management. Methods. For the mathematical model based on balance equations under uncertainty, the fuzzy-set theory was used along with the gradient descent method to identify the model parameters; for the optimization task, the genetic algorithm method was used. Results. The mass balance model and the process conditions changing model have been developed to determine the energy consumption for the technological complexes of aluminum production with continuous inertial nonlinear closed production. Based on these models, the dynamic characteristics of energy consumption and the parameters of technological processes were determined depending on the main controlled parameters, allowing us to predict emergencies. Considering technological parameters and cost factors, the optimization task for energy consumption management was solved.

A Real-Time Accounting Method for Carbon Dioxide Emissions in High-Energy-Consuming Industrial Parks

Industrial parks play a crucial role in carbon control and reduction. With energy-intensive enterprises at their core, such parks feature highly concentrated carbon emission sources and a significant demand for carbon trading. Nonetheless, the absence of precise and real-time carbon accounting methods makes it difficult for them to effectively manage and regulate carbon emissions. The real-time accounting methods for carbon dioxide emissions in high-energy-consuming industrial parks urgently need further study. Therefore, this paper initially examines three areas—fuel combustion, industrial engineering, and electricity usage—and proposes a real-time framework to account for carbon dioxide emissions in high-energy industrial parks. Secondly, it extracts real-time elements from each part and proposes a real-time carbon dioxide emission accounting method tailored to the actual needs of high-energy-consuming industrial parks. Finally, an empirical analysis is carried out on an aluminum production park as an example to verify the feasibility and effectiveness of the real-time accounting method for carbon dioxide emissions in high-energy-consuming industrial parks.

Parametric Analysis of Aluminum-Air Batteries with Focus on Aluminum Product Layer Management for Enhanced Power Output

Aluminum-air batteries are a promising next-generation technology due to their high energy density coupled with the abundance of aluminum and a well-established supply chain. One field that stands to particularly benefit from these greater capacities is aircraft electrification. Aviation applications pose a unique challenge in that the energy source for flight must provide a considerable upside relative to the weight it adds to the vehicle. Lithium-ion technology has been successfully implemented in drones for short flight times, but aluminum-air batteries have the potential to greatly extend the durations of these flights. While the energy density is where this chemistry has a unique competitive advantage, the power output presents a challenge. Although researchers have investigated lithium-ion battery discharge at high C-rates, most aluminum-air battery research has focused on maximizing utilization and energy density. For viable implementation in electric aircraft, focus must be placed on maximizing the power output of the aluminum-air chemistry with care to maintain the energy density that gives it its competitive advantage. At high power outputs, system performance is largely dictated by ohmic losses on the anode side associated with the aluminum product layer. Turnover of this secondary passivation layer is based on conversion of insoluble aluminum hydroxide to soluble aluminate ions, and this can be strongly influenced by several system parameters including electrolyte concentration, temperature, and flow rate. This investigation conducts a parametric analysis of these parameters with respect to their influence on resistance of the aluminum product film and its dissolution. The effects will primarily be studied using electrochemical impedance spectroscopy and polarization curves in conjunction with insight from Tafel analysis, surface imaging, and extended discharge testing. Both three-electrode and full-cell setups will be used for testing to allow for clear insight to surface-level processes and an idea of how the investigated factors scale up when implemented in a real system. Management of the aluminum product film is critical for achieving high power output, and this investigation will provide further insight to how key cell parameters influence the realization of this goal.

Production of High-Purity Aluminum by Combining Lewis Acidic AlCl3−[C2mim]Cl Ionic Liquid and Aluminum Scrap Anode

Aluminum (Al) is one of essential non-ferrous metals and is used in various places. Industrially, Al is produced using Hall-Héroult process, which requires massive amount of electricity (12,500~15,000 kWh t-1) and releases large quantities of greenhouse gas, being a high environmental impact process. In contrast, recycling Al requires only 3% of the energy needed to produce new metal. But, Al with many impurities is difficult to recycle and is eventually discarded.1 This is a waste of Al resources, so if Al with a purity equivalent to new metal can be obtained from such low-grade Al, i.e., Al scrap, using a process with a low environmental impact, it will likely attract attention as a new Al production process. To make this possible, we have focused on Al electrodeposition in Lewis acidic aluminum chloride (AlCl3) based ionic liquids (ILs) (AlCl3 molar fraction: 50 mol% < ). Due to the following electrochemical reaction in the ILs, high current efficiency can be expected:2 4[Al2Cl7]- + 3e- ⇌ Al + 7[AlCl4]- (1)In this presentation, in order to find the appropriate electrolysis conditions, e.g., bath temperature, Lewis acidity of the ILs, and applied current densities, for electrochemical high purity Al recovery from different Al scrap anodes, electrode behavior of the Al scrap anodes was examined in Lewis acidic AlCl3−1-ethyl-3-methylimidazolium chloride (AlCl3−[C2mim]Cl) ILs.The preparation and purification processes for AlCl3 and [C2mim]Cl were identical with those described in previous articles.2 All electrochemical experiments were conducted using a three-electrode cell. The working and counter electrodes were Cu plate cathodes defined the area (2 cm2) and Al scrap plate anodes defined the area (2 or 4 cm2), respectively. Al scraps employed in this investigation were expanded materials (A3003, A5182, and A6016) and a casting material (ADC12). For comparison, a pure Al plate was also used. The reference electrode was an Al wire immersed in the same Lewis acidic IL as the electrolyte, but separated from the electrolyte by a glass frit. The distance between the working and counter electrodes was 2 cm. The amount of IL electrolyte used was 50 mL. Electrolysis experiments were conducted at -5 mA cm-2 or more. The cathode was replaced every 25 hours, and constant current electrolysis experiments were performed for a total of 100 hours under different temperature conditions. All the experiments were carried out in an Ar gas-filled glove box with O2 and H2O < 1 ppm. The electrodes after electrolysis experiment were rinsed with dry tetrahydrofuran (THF) and ultrapure water and characterized by SEM, EDX, EPMA, and XRD.Al electrodeposition proceeds through the reduction reaction of [Al2Cl7]− as shown in eq. (1). Therefore, if 66.7-33.3 mol% AlCl3−[C2mim]Cl, which has the highest concentration of [Al2Cl7]− in the IL system, is used, we expected that it is possible to recover Al at higher current density. However, when the anode surface area was 2 cm2, although the Al anode was a pure Al plate, the potential of the Al anode sharply increased during electrolysis within 600 sec. (Fig. 1). The 66.7-33.3 mol% AlCl3−[C2mim]Cl was not suitable for long-term electrolysis at room temperature. This phenomenon would be caused by AlCl3 precipitation on the anode surface due to a rapid increase in Lewis acidity at the IL electrolyte | anode interface.3,4 But, when a similar study using 60.0-40.0 mol% AlCl3−[C2mim]Cl, which has lower Lewis acidity, was conducted, the situation was greatly improved, and the maximum current density that can be electrolyzed for 25 hours at room temperature and without stirring was -5 mA cm-2. At 323 K, the current density reached -7.5 mA cm- 2. Furthermore, under the same condition but different surface area of the anode (4 cm2), Al electrolysis process could be achieved at a current density of -10 mA cm-2. Based on the above results, in subsequent experiments, we used a 60.0-40.0 mol% AlCl3−[C2mim]Cl as the electrolyte and set the cathode and anode areas to 2 cm2 and 4 cm2, respectively.We conducted experiments on Al recovery under various conditions. Operations at 373 K resulted in improvements in the purity and electric power consumption rate of the recovered Al. The details will be introduced at the presentation. References A. N. Løvik, et al., Environ. Sci. Technol., 48, 4257 (2014).T. Tsuda, G. R. Stafford, and C. L. Hussey, J. Electrochem. Soc., 164, H5007 (2017), and references therein.C. Wang and C. L. Hussey, J. Electrochem. Soc., 162, H151 (2015).C. Wang, C. L. Hussey, et al., J. Electrochem. Soc., 163, H1186 (2016). Figure 1

Wet oxidative removal of low-valent sulfur by addition of H2O2 to Bayer fluid

ABSTRACT The presence of sulfur in sodium aluminate solution can disrupt the Bayer process in alumina production. H2O2 is used as an oxidant to convert low-valent sulfur (S2−) into high-valent sulfur (i.e. S2O3 2−, SO3 2−, and SO4 2−). This paper combines thermodynamic calculations and experimentation to propose the mechanism of the oxidation reaction between H2O2 and different valences of sulfur (i.e. S2O3 2−, SO3 2−, and SO4 2−) in sodium aluminate solution with the oxidation effect of S2− being the most obvious. By studying the oxidation effect of H2O2 dosage, oxidation time, and oxidation temperature on different valences of sulfur in sodium aluminate solution, it was found that the removal rate of S2− reached 91.85% with 9% H2O2 dosage, 260 °C oxidation temperature, and 60 min oxidation time. The experimental results were consistent with the thermodynamic calculations. Finally, the reaction between H2O2 and different valences of sulfur in sodium aluminate solution was described in detail, providing theoretical support for the desulfurisation of high-sulfur bauxite in the production of alumina through the Bayer process.