Environmentally clean materials from hazardous red mud, ground cooled ferrous slag and lime production waste

Mymrin, Vsévolod; Alekseev, Kirill; Fortini, Otavio; Aibuldinov, Yelaman K.; Pedroso, Fiona L.; Nagalli, André; Winter, E.E.; Catai, Rodrigo Eduardo; Costa, Eliane Betânia Carvalho

doi:10.1016/j.jclepro.2017.05.109

Cited by 34 publications

(10 citation statements)

References 10 publications

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“…From the point of view of extraction of REE, wastes of mining and metallurgical production are of little importance, but they are serious sources for production of germanium, bismuth, scandium, titanium, beryllium, vanadium [21,22]. In part, metallurgical slags of lead production, along with wastes from mechanical processing of sediment materials, are the main source of obtaining germanium (as well as bismuth); applied technology -hydrometallurgy.…”

Section: Resultsmentioning

confidence: 99%

Analytical evaluation and systematization of technologies for extraction of rare metals from production waste

SHUBOV¹,

Doronkina

Borisova

et al. 2021

E3S Web Conf.

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The article is a message containing systematized information on resource-saving technologies as the basic for involving metal-containing secondary raw materials in the economic turnover. The set of independent technologies arranged in a certain sequence that solve the problems of resource saving allows us to compare the specific features and effectiveness of the use of each of them, the details and features of the processes. It is shown that the following can be the main sources of rare metals and REE: phosphogypsum (REE, Sr); ash and slag waste from TPPs, ash and slag waste (REE, Ti, Sc); metallurgical slags (Ge, Be, Se, Te, V); sulfuric acid dust (Se, Te); alumina production waste - red mud (Sc, REE); liquid waste from sulphate production of titanium dioxide (Sc, Ti); refinery dust bins (Se, Te); wastes from production of permanent magnets (Nd, Sm). It is noted that the technology uses beneficiation methods, acid leaching and ion-exchange concentration, biotechnology, electrolysis, heat treatment, a combination of different methods. To assess the quality of man-made raw materials and their suitability for complex processing and utilization, the article uses the methodology of analytical research of a set of patented technological solutions (technological samples were taken from real man-made deposits).

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Section: Resultsmentioning

confidence: 99%

Analytical evaluation and systematization of technologies for extraction of rare metals from production waste

SHUBOV¹,

Doronkina

Borisova

et al. 2021

E3S Web Conf.

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show abstract

“…In this RM/furnace slag system, although the amount of the lime waste was only about 3%, the compressive strength showed a sharp increase of over 50% higher than the non-lime addition samples. Unfortunately, the reaction mechanism of the lime was NOT deeply elucidated although the authors had tested the XRD and SEM of the hydrated samples [27].…”

Section: Limementioning

confidence: 99%

“…The TG results indicated that the high amount of Ca (OH) 2 in the pastes was not conducive to the continuous increase of non-evaporable water content. A big step forward of this study was that the authors used the 27 Al MAS NMR to investigate the coordination state of the Al in the hydration product phases. The results indicate that the content of Al [4] in the C-A-S-H phase remained relatively constant during the hydration progress, while the content of Al [6] in Ca 3 Al 2 O 6 •xH 2 O increased significantly with the elongation of the hydration time.…”

Section: Coal Ganguementioning

confidence: 99%

Synergistically Using Bauxite Residue (Red Mud) and Other Solid Wastes to Manufacture Eco-Friendly Cementitious Materials

Wenliang

Zheng

et al. 2022

Buildings

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Bauxite residue (red mud) is a solid waste resulting from the aluminum production industry. Disposal or landfill of the red mud (RM) poses irreversible environmental problems; therefore, it is compelling to find practical solutions that can mitigate the negative environmental problems of RM stacking storage. In the past decades, although the recycling of RM has achieved significant progress, challenges remain from both academic and practical perspectives. Previous studies have demonstrated that all the aluminosilicate-based solid wastes have pozzolanic activity, and thus can be considered as resources to manufacture eco-friendly cementitious materials to relieve the carbon emission burden. Therefore, combining RM and other solid wastes to manufacture green cementitious materials has become a promising route to alleviate the burden of environmental pollutions. However, challenges from the fluctuation of the chemical compositions, inert activity, heavy metals stabilization, efflorescence, the side effects of the second pollutions from solid wastes, the hydration process, and mutual interaction mechanisms between the various types of solid wastes are still unclear, especially for multi-components RM-based cementitious materials. This review article summarizes the state of the art of mechanical properties, microstructure characterization methodologies, and hydration process and mechanisms of RM along with other solid wastes. The main challenges and future research trends are discussed. This article attempts to summarize the details of the RM recycling technologies that are beneficial to readers in understanding the background knowledge and research methodologies of eco-friendly cementitious materials.

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“…In recent years, several studies have been conducted to find eco-friendly, cost-effective alternative methods to dispose of tailings [15,16]. Thus, the need for safe environmental disposal has led to the adoption of new processes for tailings storage that limit the release of pollutants, reduce seepage, and reduce water use.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Electrical Conductivity Monitoring and Correlation with Sulfate Release and Acid Mine Drainage Potential from a Gold/Silver Paste Tailing Storage

2021

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Safe disposal of tailings as high-density thickened tailings or paste tailings can reduce the environmental risks of conventional tailings deposits, reduce water use, minimize tailings storage facility footprints, reduce the potential for acid mine drainage (AMD), and minimize risks of failure, among other advantages. In the dewatering process, the addition of flocculants is key to improving the sedimentation of the tailings and the formation of a compact paste. Despite the environmental and operational advantages of using paste tailings, it is not clear how the chemical nature of coagulants and flocculants could influence the discharge of toxic elements (salts and metals) from tailings after storage. In this study, we show the results of the real-time evaluation of the release of polluting runoffs from a paste tailings deposit. To do this, we analyzed paste tailing samples for AMD potential through static and kinetic tests and monitored the electrical conductivity and real-time pH, evaluating the correlation with the sulfate in the thickener and downstream from the tailings deposit. Tailing samples have low sulfur content (<2%) and low acid-generating potential. Moreover, there is no evidence of a significant positive correlation (Pearson’s coefficient r < 0.8) between the sulfate concentrations with the pH or EC. Thus, the chemical nature of the paste tailings prior to discharge has no direct impact on the release of sulfate-rich runoffs from the tailings after its storage. This indicates that the tailings paste at the evaluated site is chemically stable in the short term.

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Environmentally clean materials from hazardous red mud, ground cooled ferrous slag and lime production waste

Cited by 34 publications

References 10 publications

Analytical evaluation and systematization of technologies for extraction of rare metals from production waste

Analytical evaluation and systematization of technologies for extraction of rare metals from production waste

Synergistically Using Bauxite Residue (Red Mud) and Other Solid Wastes to Manufacture Eco-Friendly Cementitious Materials

Real-Time Electrical Conductivity Monitoring and Correlation with Sulfate Release and Acid Mine Drainage Potential from a Gold/Silver Paste Tailing Storage

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