Towards a More Equitable Use of Mineral Resources

Christmann, Patrice

doi:10.1007/s11053-017-9343-6

Cited by 70 publications

(53 citation statements)

References 17 publications

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“…As humankind has become a geological force on the planet (ZALASIEWICZ, 2008), concern about the exhaustion of natural (including mineral) resources has been raised worldwide (CORDELL et al, 2009;HENGEVELD, 2012; MANNING, (11,90%) Silva et al 2015;CHRISTMANN, 2017). Therefore, RMs were included in Brazil's National Mineral Plan to 2030 (BRASIL, 2010), and laws were established to allow them to be registered with the Ministry of Agriculture as a soil amendment (DOU, 2013).…”

Section: Introductionmentioning

confidence: 99%

Chemical attributes of a remineralized Oxisol

et al. 2017

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Remineralizers are comminuted rocks that are applied to soil, and their use as an agricultural amendment was regulated in Brazil in 2013. However, mechanisms of action of these materials must be better known to enable them to be best used in agricultural fields. Soil chemical attributes of an Oxisol were monitored after the application of a diabase remineralizer. The increase in exchangeable Na observed was associated with the dissolution of the border of the plagioclase crystals where this element is highly concentrated (albite). Therefore, it was inferred that the time since the application of the remineralizer (1 to 2 years depending on the treatment) was not sufficient to exhaust this crystal volume. Unfortunately, the presence of several sources of Ca-containing minerals in the remineralizer did not allow to infer if the calcic nuclei was dissolving. An increase in effective cation exchange capacity was observed without the concurrent increase in the pH of the soil. The two non-exclusive hypotheses proposed to explain this result were that an extra surface charge has originated on the surface of the newly precipitated oxidic phases and/or from the dissolution of the remineralizer grains. Rapid precipitation of amorphous solids (as measured by the increase in Alo and Feo) would also explain the lack of increase in exchangeable Fe and Al despite the large amount of Al2O3 (11.90%) and Fe2O3 (14.45%) in the remineralizer.

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Section: Introductionmentioning

confidence: 99%

Chemical attributes of a remineralized Oxisol

et al. 2017

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“…Aluminium of Greece plant (Metallurgy Business Unit, Mytilineos S.A.; hereafter denoted as AoG) uses a set of processing conditions that are known in the industrial sector as high temperature digestion (HTD). These conditions (T > 250 • C, elevated pressure) are dictated by the utilisation of mainly karst bauxite, in which primary alumina-containing minerals are diaspore (α-AlO(OH), digested mostly at >250 • C in the presence of lime) and boehmite (γ-AlO(OH), digested mostly at >240 • C) that dissolve less readily than the more commonly exploited gibbsite mineral (Al(OH) 3 , digested mostly at 140-150 • C) [9,42,43].…”

Section: Methodsmentioning

confidence: 99%

“…To obtain de-watered bauxite residue that helps to reduce the losses of soda and eases the stacking as well as further utilisation of residue, AoG makes use of the plate and frame filter pressing of the initial residue slurry after the settling and washing unit [7]. The clear pregnant liquor, rich in sodium aluminate, passes to the next processing step where crystalline aluminium hydroxide (Al(OH) 3 ) is precipitated. Precipitation is initiated by the introduction of aluminium hydroxide seed crystals.…”

Section: Methodsmentioning

confidence: 99%

“…The ever-increasing growth in the electronics industry, the production of light-weight electric vehicles as well as devices for generating renewable energy have imposed an accelerating demand for specific raw materials such as the rare earth elements (REEs) [1][2][3]. Several economic regions like the European Union, Japan or USA have identified raw materials that are categorised as "critical", relating to their supply risk and economic importance [1,4].…”

Section: Introductionmentioning

confidence: 99%

“…There exists a growing interest in the extraction of the relatively valuable REEs and Sc from bauxite residue by exploiting various hydrometallurgical or combined pyro-and hydrometallurgical routes [5][6][7]11,17,18]. In addition, the demand for these metals has been increasing steadily and further increase is projected in the future [1,3,15].…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Selected Trace Elements in the Bayer Process

Vind

Alexandri

Vassiliadou³

et al. 2018

Metals

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Abstract:The aim of this work was to achieve an understanding of the distribution of selected bauxite trace elements (gallium (Ga), vanadium (V), arsenic (As), chromium (Cr), rare earth elements (REEs), scandium (Sc)) in the Bayer process. The assessment was designed as a case study in an alumina plant in operation to provide an overview of the trace elements behaviour in an actual industrial setup. A combination of analytical techniques was used, mainly inductively coupled plasma mass spectrometry and optical emission spectroscopy as well as instrumental neutron activation analysis. It was found that Ga, V and As as well as, to a minor extent, Cr are principally accumulated in Bayer process liquors. In addition, Ga is also fractionated to alumina at the end of the Bayer processing cycle. The rest of these elements pass to bauxite residue. REEs and Sc have the tendency to remain practically unaffected in the solid phases of the Bayer process and, therefore, at least 98% of their mass is transferred to bauxite residue. The interest in such a study originates from the fact that many of these trace constituents of bauxite ore could potentially become valuable by-products of the Bayer process; therefore, the understanding of their behaviour needs to be expanded. In fact, Ga and V are already by-products of the Bayer process, but their distribution patterns have not been provided in the existing open literature.

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How does digitization enable green innovation? Evidence from Chinese listed companies

Chen,

Zhu,

Cheung

et al. 2024

Bus Strat Env

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The coordinated development of digitization and greening is an essential requirement for the sustainable development of the global economy. With the rapid development of the digital economy, enterprises are facing a new external environment for green innovation. This paper uses the robust principal component analysis method to construct the digital economy development index for Chinese prefecture‐level or above cities from 2012 to 2019 and examines the impact of the digital economy on corporate green innovation. It is found that the development of the digital economy can stimulate corporate green innovation by alleviating financing constraints, improving internal control, and reducing environmental uncertainty. This study further reveals that both increasing government environmental regulation and stronger judicial guarantees can enhance the positive impact of digitization. This research aims to provide inspiration and reference on how better to integrate digital economy development and corporate green innovation.

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Towards a More Equitable Use of Mineral Resources

Cited by 70 publications

References 17 publications

Chemical attributes of a remineralized Oxisol

Chemical attributes of a remineralized Oxisol

Distribution of Selected Trace Elements in the Bayer Process

How does digitization enable green innovation? Evidence from Chinese listed companies

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