Reduction roasting and bioleaching of a limonite ore

Oliveira, Victor de Alvarenga; Rodrigues, Michael Leonardo Marques; Leão, Versiane Albis

doi:10.1016/j.hydromet.2021.105554

Cited by 13 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature range, between 120 and 600 • C, for the thermal decomposition of this mineral is consistent with the values reported in literature [22][23][24][25]. Utilizing the calculated mass loss value in the TGA curve for event [A], it was possible to determine that the content of goethite in the sample was 34.6% in weight.…”

Section: Chemical and Metallurgical Characterization Of Raw Materialssupporting

confidence: 85%

Batch Sintering of FeO·OH and Fe2O3 Blends: Chemical and Metallurgical Characterization

Pereira,

Coelho,

Santos

et al. 2024

Metals

View full text Add to dashboard Cite

A sample of goethite iron ore sinter feed (G_SF) was employed as a raw material in a sintering bed. This sample partially replaced hematite sinter feed (H_SF), which is currently used as raw material in a sintering plant in the state of Minas Gerais, Brazil. This substitution did not adversely affect the chemical and metallurgical proprieties of the sinter mix product, provided that the utilization of G_SF was kept below 30% in weight. Despite the higher proportion of fines in G_SF, the presence of argillaceous minerals in the sample led to an improvement in the granulation index (GI) of the sinter mix product. The GI value increased from 68.4 to 82.7% for the experiments conducted without the presence of goethite ore and with 40% of goethite ore in the sintering mix, respectively. Consequently, the qualities of both the process and the produced sinter product were not compromised. The raw materials and the various sinters produced were characterized through X-ray fluorescence (XRF) and X-ray diffraction (XRD), as well as thermal gravimetric analysis (TGA). The XRD results were used to perform a quantitative assessment of the mineral phase using the Rietveld method (RM). This technique allowed for the determination of goethite content in the studied sample, which was 35.5%. Finally, the incorporation of G_SF in the sintering bed led to a 20% reduction in the cost of raw materials.

show abstract

Section: Chemical and Metallurgical Characterization Of Raw Materialssupporting

confidence: 85%

Batch Sintering of FeO·OH and Fe2O3 Blends: Chemical and Metallurgical Characterization

Pereira,

Coelho,

Santos

et al. 2024

Metals

View full text Add to dashboard Cite

show abstract

“…This nickel matte can be subsequently treated in a variety of ways. In the ammonia pressure leach process, nickel is recovered from solution using hydrogen reduction, and sulfur is recovered as ammonium sulfate. ,,, The matte could also be roasted to create high-quality nickel oxides. These are pressure leached, and the resulting solution is electro- and carbonyl refined.…”

Section: Sustainability Aspects In Extractive Metallurgical Processingmentioning

confidence: 99%

“…Bacteria used for this purpose are for example the sulfur bacteria Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans , the iron-oxidizing bacterium Leptospirillum ferrooxidans and the sulfur- and iron-oxidizing Archaea acidianus brierleyi , ,,, where the latter ones are acidophilic, i.e. acid-loving agents.…”

Section: Sustainability Aspects In Extractive Metallurgical Processingmentioning

confidence: 99%

The Materials Science behind Sustainable Metals and Alloys

Raabe

2023

Chem. Rev.

View full text Add to dashboard Cite

Production of metals stands for 40% of all industrial greenhouse gas emissions, 10% of the global energy consumption, 3.2 billion tonnes of minerals mined, and several billion tonnes of by-products every year. Therefore, metals must become more sustainable. A circular economy model does not work, because market demand exceeds the available scrap currently by about two-thirds. Even under optimal conditions, at least one-third of the metals will also in the future come from primary production, creating huge emissions. Although the influence of metals on global warming has been discussed with respect to mitigation strategies and socio-economic factors, the fundamental materials science to make the metallurgical sector more sustainable has been less addressed. This may be attributed to the fact that the field of sustainable metals describes a global challenge, but not yet a homogeneous research field. However, the sheer magnitude of this challenge and its huge environmental effects, caused by more than 2 billion tonnes of metals produced every year, make its sustainability an essential research topic not only from a technological point of view but also from a basic materials research perspective. Therefore, this paper aims to identify and discuss the most pressing scientific bottleneck questions and key mechanisms, considering metal synthesis from primary (minerals), secondary (scrap), and tertiary (re-mined) sources as well as the energy-intensive downstream processing. Focus is placed on materials science aspects, particularly on those that help reduce CO2 emissions, and less on process engineering or economy. The paper does not describe the devastating influence of metal-related greenhouse gas emissions on climate, but scientific approaches how to solve this problem, through research that can render metallurgy fossil-free. The content is considering only direct measures to metallurgical sustainability (production) and not indirect measures that materials leverage through their properties (strength, weight, longevity, functionality).

show abstract

“…Because of the nickel lattice substitution in the goethite, low nickel extraction is obtained during atmospheric acid leaching . To improve the iron and nickel leaching in the atmospheric acid leaching process, some related measures such as pre-calcination, , mechanochemical activation, reductant addition, , and surfactant addition have been used. In comparison, goethite can be efficiently leached at high temperatures and pressures .…”

Section: Introductionmentioning

confidence: 99%

Near-Zero-Waste Approach for the Treatment of Saprolitic Nickel Laterite via a Combined Hydrometallurgical Process

Chen

Mang

et al. 2023

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Atmospheric acid leaching can be used for processing the nickel laterite ore. The lixivium composition necessitates Fe 3+ separation as the first step in recovering valuable metals. However, traditional partial neutralization has the problem of significant loss of Ni 2+ and Co 2+ ions due to the high Fe 3+ concentration. Besides, the discharged acidic residue leads to environmental pollution. This study proposes a combined hydrometallurgical method for efficiently recovering valuable components from saprolitic laterite. After atmospheric sulfuric acid leaching, the Fe 3+ in the lixivium was first separated using phosphoric acid and sodium hydroxide as reagents; 92% of the Fe 3+ precipitated as iron phosphate at a pH of 1.8. The charge and discharge capacities of the LFP sample prepared from this iron phosphate at the rate of 1 C were 157 and 154 mA h/g, respectively. During the recovery of Fe 3+ ions, approximately 100% of other metals were retained in the aqueous solution. After adjustment of the pH to 6.0, this solution was used to remove impurities, including Al, Mn, Cr, and Fe. Then, more than 98% of Ni and Co were recovered as Ni,Co(OH) 2 precipitates at a pH of 8.0−9.0. When the pH was raised to 11.0, over 98% of Mg precipitated as Mg(OH) 2 . The leach residue with a high silica content was used to prepare calcium silicate hydrate (C−S−H) via a hydrothermal process. The recovery of FePO 4 , Mg(OH) 2 , and C−S−H, in addition to Ni,Co(OH) 2 , made this a value-added process and with a near-zero residue discharge.

show abstract

Reduction roasting and bioleaching of a limonite ore

Cited by 13 publications

References 23 publications

Batch Sintering of FeO·OH and Fe2O3 Blends: Chemical and Metallurgical Characterization

Batch Sintering of FeO·OH and Fe2O3 Blends: Chemical and Metallurgical Characterization

The Materials Science behind Sustainable Metals and Alloys

Near-Zero-Waste Approach for the Treatment of Saprolitic Nickel Laterite via a Combined Hydrometallurgical Process

Contact Info

Product

Resources

About