Citations: 25 Read the full text PDF Tools Share Abstract We compared rates of desorption of heavy metals from goethite, an important soil constituent, in order to understand the mechanisms of sorption and desorption better. Samples of goethite were reacted with salt solutions of heavy metals for 2 hours or for 8 weeks.

Citations Metrics Licensing Reprints & Permissions View PDF ABSTRACT Formulae display:? This paper has investigated the synthesis and characterization of CuO-coated goethite and its application in the removal of mercury. The presence of CuO coating significantly modified the adsorption pattern of mercury on goethite.

Despite zinc can be profitably extracted from low-grade ore containing Zn as smithsonite (ZnCO 3) ( Seyed Ghasemi and Azizi, 2018) by alkaline leaching, the same technique does not dissolve franklinite spinel (ZnFe 2 O 4) even with microwave caustic leaching ( Xia and Pickles, 2000 ).

In 1976, Sridhar et al. introduced a pyrometallurgical process combined with hydrometallurgical extraction developed by the former International Nickel Company (Inco). The aim of this process is to reduce the mass that has to be leached in the hydrometallurgical process. 5

The conversion of Al-substituted goethite (Al-goethite) to hematite in gibbsitic bauxite is conducive toalumina extraction during the Bayer process and the enrichment of iron minerals in red mud.

Low-temperature thermal conversion of Al-substituted goethite in gibbsitic bauxite for maximum alumina extraction RSC Adv. 2022 Feb 2;12 (7):4162-4174. doi: 10.1039/d1ra09013e. eCollection 2022 Jan 28. Authors Guotao Zhou 1, Yilin Wang 1, Tiangui Qi 1, Qiusheng Zhou 1, Guihua Liu 1, Zhihong Peng 1, Xiaobin Li 1 Affiliation

ABSTRACT. As higher-grade ores become depleted, there will be a greater focus on developing suitable beneficiation strategies to treat low-grade hematite-goethite ores containing higher levels of impurities such as silica and alumina.

Low-temperature roasting can improve the conversion of Al-goethite in gibbsitic bauxite to porous Al-hematite, and favor increasing the alumina extraction during Bayer digestion and enrichment...

After longer sorption (8 weeks), even 360 hours of extraction with 0.7 m HNO 3 did not recover all of the sorbed metals. Complete dissolution of the goethite particles was necessary. This suggests that the eight heavy metals had penetrated the goethite particles deeply.

Ethylenediaminetetraacetic acid (EDTA; C 10 H 16 N 2 O 8 ) is a strong complexing agent, and was found to dissolve similar amounts of Fe from synthetic oxides (ferrihydrite, goethite and...

Iron oxides (goethite) were recovered from acid mine drainage through a sequential precipitation method. Thermal treatment at temperatures higher than 300 °C produces hematite through a decrease in the BET area and an …

The rate and extent of goethite reduction were measured as a function of electron acceptor (goethite) and donor (lactate) concentrations. Increasing goethite …

The study of the extraction of Re% As(Ill) 100" 80" 60" 40 20 G---~ D Goethlto (oIL)r 0 I 3 5 9 11 13 pH Fig. 4. Sorption of As(III) on goethite (contact time 30 min), at …

This study presents a simple but effective process route for the production of transparent coatings on glass substrates from inorganic pigment goethite. For this purpose, coating suspensions were prepared by wet milling with a stirred media mill. A water/ethanol mixture was used as the liquid medium to take advantage of the resulting low surface …

The two methods used to achieved discrimination are; (1) reflectance spectroscopy in the visible, near and short wave infrared (VNSWIR) wavelength range (380 to 2500 nm) and (2) high-resolution X-ray computed tomography (HRXCT). Ochreous and vitreous goethite subtypes are spectrally different in the VNSWIR range.

In this study, goethite (α-FeOOH) and Fe 2+ -modified magnetic goethite (M-α-FeOOH) were prepared using an easy one-pot chemical precipitation method and …

Goethite is one of the most ubiquitous minerals on the Earth's surface and it is also a significant mineral in economic deposits such as iron ore. Goethite was named in 1806 after the German poet, philosopher and naturalist Johann von Goethe. In iron ore, the two main goethite subtypes are ochreous and vitreous, respectively defined by ...

In this study, goethite (α-FeOOH) and Fe 2+ -modified magnetic goethite (M-α-FeOOH) were prepared using an easy one-pot chemical precipitation method and used to remove uranium from solution.

We believe that beyond this fundamental knowledge concerning the affinity of Sc for goethite, these results provide important insights into Sc speciation in primary or secondary sources, including Sc …

The third mass lost at ~ 400 °C is assigned to two distinct steps: (i) the goethite transformation into hematite (this endothermic transformation occurs at a temperature of 324-350 °C [45]) and ...

Low-temperature roasting can improve the conversion of Al-goethite in gibbsitic bauxite to porous Al-hematite, and favor increasing the alumina extraction during Bayer digestion and enrichment of ...

The behaviours of incorporated cobalt in goethite during desorption and dissolution is fundamental to our understanding of the best extraction techniques for …

As higher-grade ores become depleted, there will be a greater focus on developing suitable beneficiation strategies to treat low-grade hematite-goethite ores containing higher levels of impurities such as silica and alumina. The processes selected …

Bio-extraction of phosphorus from goethite ore with alkali addition Sharath Kumar Ankathi 2019, Minerals Engineering Phosphorus is well known as an unwanted element in …

The use of ethylenediaminetetraacetic acid (EDTA) for soil remediation is under concern due to its non-biodegradability and toxicity; thus, its biodegradable structural isomer, [S,S]-ethylenediamine disuccinate ( [S,S]-EDDS), has been proposed as an emerging substitute.

The goethite/hematite + goethite ratio of 11 profiles of Oxisols, Ultisols and Inceptisols along a 600 km E-W transect in S. Brazil varied systematically with climatic and soil factors. The ratio increased with decreasing mean annual air temperature, increasing excess moisture (rainfall minus evapotranspiration), increasing soil organic carbon ...

In zinc leaching, iron is removed from zinc sulphate solution by iron precipitation. The mainstay of iron precipitation includes jarosite, goethite and hematite, of which goethite …

We believe that beyond this fundamental knowledge concerning the affinity of Sc for goethite, these results provide important insights into Sc speciation in primary or secondary sources, including Sc-rich lateritic deposits and bauxite residues after alumina extraction, for the future design of extraction processes with a low environmental footp...

Goethite is one of the important ferruginous mineral in lateritic rock, lateritic iron ore and important part of the iron ore slimes. It occurs as vitreous goethite and …

... Goethite is the most abundant thermodynamically stable iron oxide phase that is widely distributed in rocks, and soils (Llavona et al., 2013). It is a yellow antiferromagnetic iron oxide...

Goethite (α-FeOOH) is a common oxy-hydroxide in natural environment and is formed as a weathering product of iron-bearing minerals. This mineral is the most …

11 Citations Metrics Abstract An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals in the ore were...

And it is suitable for hematite extraction (38.0%) for 24 h, with 27.5% extraction efficiency for goethite. Hence, the results of this extractability study of synthetic minerals contributed to extraction of field samples. ... Canfield DE. Development of a sequential extraction procedure for iron: implications for iron partitioning in ...

Goethite is found as an supergene oxidizing (weathering) product of many iron minerals. In the near surface, it was an important iron ore mineral developed over banded iron formations. It is found in sedimentary rocks as concretions and was mined from bog ore deposits. It is a component of limonite and is found in the weathered gossans of ...

The results showed that after precipitation of iron, Zn extraction of 88.5% was obtained with the 2 stages extraction system composed of 30 vol% D2EHPA as …

recrystallisation of the goethite has occurred in natural deposits, these phosphorus levels are generally lower.8) The precise mechanism causing elevated phosphorus lev-els in goethite remains unclear although it seems likely that the phosphorus is adsorbed onto the growing surfaces of gel-like precursors that crystallise as goethite during the