Now researchers report a relatively simple way to extract iron from red mud: by blasting it with ahydrogen plasma in an electric-arc furnace ( Nature 2024, DOI: 10.1038/s41586-023-06901-z ...
The complete flow chart of the novel process "KOH hydrothermal treatment of red mud or CFA to prepare potassium-containing fertilizer for synergistic extraction of alumina" is shown in Fig. 1 (Zhang et al., 2021b, Zhang et al., 2021c).In this paper, the dissolving thermodynamics of Al(OH) 3 in KOH solution were calculated, and the …
The effect of the thermal treated red mud on mechanical properties of loess –containing aluminosilicate based cementitious materials is investigated. And the characteristic of hydration production is tested using XRD, SEM and EDAX methods. The results show that the thermal treated red mud not only has excellent cementitious …
These results, for example, indicate that GX (a high-iron diaspore red mud) contains more than 1015 μg/g lanthanides, 313 μg/g yttrium, 115 μg/g scandium, and 252 μg/g niobium and that HN (a ...
Red mud storage not only occupies land, but also requires expensive yard maintenance, resulting in higher storage cost (Archambo and Kawatra, 2020, Archambo and Kawatra, 2020). 3. Characteristics of red mud. ... Different iron-containing products could be obtained by different methods for iron extraction from red mud. For example, …
The slurry red mud received directly from the aluminum industry contains a lot of water and moisture. Red mud needs to be dried at 100 °C for 24 h, to remove the …
Request PDF | Investigation the synergistic effects in quaternary binder containing red mud, blast furnace slag, steel slag and flue gas desulfurization gypsum based on artificial neural networks ...
Red mud-slag mix containing 20 % slag showed maximum UCS and CBR value at 2 % NaOH content whereas 4 % of NaOH was found to be optimum for the mix containing 40 % slag. The mineralogical, chemical, and microstructural analysis confirmed the hydration products, geopolymeric products, characteristic bonds and microstructure …
A combined low-temperature sodium salt-assisted roasting and water leaching process was investigated as a cleaning method for the treatment of Al-goethite-containing red mud (AGRM), which is conducive to aluminum recycling and iron mineral enrichment in leaching residue. In this work, the mineralogical characteristics and phase …
Red mud (RM) is a solid waste derived from processing bauxite ore to produce alumina and is considered a hazardous waste due to its high pH. This paper describes the use of untreated mud and after ...
In this review paper, the effort is made to present the properties of concrete with red mud after studying several research papers. This paper discusses the properties of red mud concrete such as workability, compressive strength, split tensile strength, flexural strength, water absorption and modulus of elasticity.
Red mud (RM) is a by-product of extracting of alumina from bauxite. Red mud contains high quantities of alkali-generating minerals and metal ions, which can cause significant environmental damage. Many …
Red mud can be considered as a value-driver by-product, containing valuable metals, ... (2011) were reported recovery of scandium from synthetic red mud leach solutions containing 5.5 mg/L of scandium. The D2EHPA as an extractant and TBP as a phase modifier were used. Stripping was achieved using 5 M NaOH solution [66]. …
The Measured/Calculated exhalation ratio of the red mud-containing R/G series showed the opposite tendency. The increasing red mud content decreased the Measured/Calculated exhalation ratio from 1.06 to 0.82. From these results, it can be concluded that the fly ash containing AAMs can pose an elevated risk due to radon …
Red mud (RM), also called bauxite residue, is a strong alkaline industrial waste generated during the alumina production process. The annual production of RM in China is large, but its average utilization rate is low (only 4%). High generation and low consumption make the disposal of RM mainly by stockpiling, which has caused serious …
Red mud is a waste that contains a large amount of iron oxides and hydroxides, which are excellent adsorbents of arsenic, especially those possessing magnetic properties and a large specific ...
Given the caustic nature, red mud is viewed as a hazardous material. Some red mud also contains elevated levels of radionuclides, which add to its hazardousness (Ozden et al., 2019a, b).Improper disposal of red mud could cause environmental degradation in the areas surrounding the disposal sites (Pietrzyk-Sokulska and …
The as-received red mud contains majorly iron oxide, calcium oxide, aluminum oxide, silicon, and sodium oxide. Moreover, there are small amounts of …
Red mud has become trouble looking for a place to happen. In 2010, an earthen dam at one waste pond in Hungary gave way, unleashing a 2-meter-high wall of red mud that buried the town of Ajka, …
Given the caustic nature, red mud is viewed as a hazardous material. Some red mud also contains elevated levels of radionuclides, which add to its hazardousness …
Red mud contains a large quantity of valuable minerals that can be extracted to both reduce the amount of red mud and provide value to the waste. This …
Red mud is a waste generated after recovery of alumina in the Bayer process. ... Each plant, producing 1 million ton of alumina, dumps 1–1.5 million tons of red mud containing at least 1100 kg lanthanides, 150 kg Sc 2 O 3, 350 kg Y 2 O 3, 800 kg ZrO 2, 4000 kg TiO 2 etc. ...
The absorption and purification of Sulphur containing waste gases with red mud. Red mud is an appropriate absorber to purify waste gas, which has been studied by a number of researchers (Chen et al., 2007; Thang et al., 2018; Uysal et al., 1988).
The particle size distribution of the Bayer red mud was wider than the sintering red mud and the Bayer red mud containing more fine particles with a grain size under 10 μm. It is noticed that the red mud tends to aggregation once exposed to air as the particle becomes coarser even after sieving through 0.075 mm. The natural fine grain …
The I-index alone suggested that the AAMs would be suitable products. AAMs containing ground granulated blast furnace slag exhibited the lowest radon exhalation and higher compressive strength, while the fly ash and red mud AAMs had increased final radon exhalation. In the case of fly ash, alkaline activation of fly ash dramatically …
In addition, the much larger in the specific surface area of red mud than that of Portland cement might also be another reason explained for a decrease in bleeding of mixtures containing red mud. The replacement of red mud in mixtures could induce an increase in the amount of surface-adsorbed water and eventually make a decrease in …
An innovative dealkalization process on red mud of using Mn-containing leachate is proposed. • Mn-containing leachate can effectively remove Na (80%) and K (73%) from red mud. • The loss amounts of Si, Al and Fe from red mud are slight avoiding affecting subsequent utilization. • The dealkalized red mud products have low solubility …
They found that the highest a partial substitution of cement (Fig. 4). M30 strength at 15% substitute of cement with red grade concrete with red mud was approximately mud. The tensile strength was 4.61 N/mm2 after 7.48% less expensive than the standard 28 days of curing, which is higer than traditional concrete.
Red mud is an insoluble fine-grained residue of alumina production industry (Bayer process: extraction of alumina from bauxite by treatment of the ground ore with hot concentrated base) [16, 17]. The major constituents of red mud are Fe203, TiO2, A1203, CaO, SiO2 and Na20 [e.g. 18-20].
1. Introduction. Red mud is the waste produced in alumina production process [M. A. Khairul et al., 2019; Zhang et al., 2011b, Zhang et al., 2011a], and a large amount of red mud are discharged every year all over the world.The packed red mud are harmful to the ecological environment, and it is hard to manage due to its high alkalinity …
Bauxite residue (Red mud) is one of the industrial caustic waste materials obtained from alumina production. Because of high annual production, it requires high costs and vast landfills to dispose it. ... Chloride and CO 2 transport in cement paste containing red mud. Cem. Concr. Compos, 62 (2015), pp. 178-186. View PDF View article View in ...
In this research, activated red mud was utilized as fluorine-containing NiW catalyst support of diesel hydrocracking and hydrodesulfurization reactions. To determine the physicochemical properties of the prepared samples, they were characterized by XRD, FESEM, BET, FTIR, NH 3-TPD and H 2-TPR techniques. The fluorine incorporation …
In addition to this initial reactivity, red mud contains a significant content of alkalis and a favourable particle size distribution. For this reason, the idea of the study was to …
Red mud is the waste produced in alumina production process [M. A. Khairul et al., 2019; Zhang et al., 2011b, Zhang et al., 2011a], and a large amount of red mud are discharged every year all over the world. ... the manuscript entitled "Investigation the synergistic effects in quaternary binder containing red mud, blast furnace slag, …
Red mud is a reddish brown colored alkaline solid waste from the alumina refining of bauxite ore . Bayer red mud is the industrial waste slag produced by the Bayer process in the alumina plant. A ton of alumina products generates about 0.8–1.5 tons of red mud according to the grade of bauxite ores and operating conditions .
Red mud (RM) is an alkaline waste by-product discharged during the alumina manufacturing process (Agrawal and Dhawan 2021;Li et al. 2022c). The enormous storage and annual discharge of RM have ...
Red mud, which is an aluminum industry waste, has been utilized11Patent applications for the developed process have already been flied in USA as well as in India vide Application no .US—11 ...
