DOI: 10.1016/J.JCLEPRO.2019.07.028 Corpus ID: 198815917; Extraction and purification of humic acids from lignite wastes using alkaline treatment and membrane ultrafiltration @article{Sarlaki2019ExtractionAP, title={Extraction and purification of humic acids from lignite wastes using alkaline treatment and membrane ultrafiltration}, author={Ehsan …

A lignite was subjected to sequential solvent extraction via continuously reducing particle size from around 20 to more than 200 mesh. Five sets of n-hexane and methanol …

Humic acid (HA) was extracted by a hydrothermal method from Huolinhe lignite from Inner Mongolia. The effects of the alkali-to-carbon mass ratio, water-to-coal mass ratio, reaction temperature, and reaction time on the HA yield were investigated. The physicochemical characterization of the products was performed, and the reaction mechanism was …

DOI: 10.1016/j.jenvman.2024.121650 Corpus ID: 270982639; Efficient extraction and formation mechanism of fulvic acid from lignite: Experimental and DFT studies. @article{Li2024EfficientEA, title={Efficient extraction and formation mechanism of fulvic acid from lignite: Experimental and DFT studies.}, author={Na Li and Hang Ma and …

Laudal and colleagues have demonstrated they can generate a product with 60 to 90% (600,000 to 900,000 ppm) rare earths from lignite. They are now scaling up their solvent extraction process to a ...

Historique de l'extraction de la lignite et pratiques de restauration des sols en Lusace (Allemagne de l'est). Can. J. Soil Sci. 92:53 66. L'Allemagne est le plus grand …

This can be due to the alkaline extraction of humic compounds from lignite using NaOH. Subsequently, sulfur (S), iron (Fe), aluminum (Al) and silicon (Si), with concentration of 533, 447, 310 and 155 ppm, respectively, had the highest concentrations among the elements, which may due to the lignite origin. ... F.X.C. De Las Heras. Geochemical ...

lignite are still challenges in analytical chemistry. As an effective nondestructive separation method, solvent extraction at mild condition is widely applied to the study of natural components in lignite.9−13 The particle size of coal samples and extraction time involved in the solvent extraction have

Fulvic acid (FA) has many unique functions, and it has important applications in agriculture, industry, medicine and other fields. An innovative method for efficient extraction of FA, using hydrogen peroxide-glacial acetic acid to synergistically oxidize lignite was proposed, and the molecular microstructure of FA was characterized. The results show that the …

Euronews' Hans von der Brelie heads to one of the world's largest opencast pits, Garzweiler II, to witness for himself the battle to close the country's lignite mines. #EuronewsWitness

Fig. 1 shows the schematic of experimental system. A SCCO 2 extraction device (HA120-50-01-C) was used to extract water from lignite samples. From a gas cylinder, carbon dioxide was supplied and liquefied through a cooling unit. The liquefied carbon dioxide was compressed by a compression pump and sent to preheater.

Lignite was crushed and sieved through a 60 mesh sieve and dried in a vacuum oven at 105 °C to a constant weight. In this paper, ultrasound-assisted acid pretreatment of lignite was used. 20 g of lignite was taken, added to 100 mL of a 2% HNO 3 solution in a beaker, mixed ultrasonically for 2 h, and then left for 10 h. Then, it was filtered ...

and extraction time involved in the solvent extraction have been investigated.14−16 Many efforts have been made on the revealing of the molecular selectivity of solvent …

D'ici, on peut contempler Hambach, une mine de lignite de plus de 400 mètres de profondeur – un panorama qui évoque le Grand Canyon. On peine à s'imaginer qu'un cratère si gigantesque a été creusé par l'homme. ... C'est également un combustible très polluant, dont l'extraction impose parfois le déplacement de villages ...

In order to improve the extraction rate of coal by solvent extraction, Lianhuatang lignite (LHT) was pretreated with 1-butyl-3-methylimidazolium hexafluorophosphate ionic …

Raw materials that were used for the extraction of humic acids, were derived from Polish deposits: the peatland in Żuławy district and the Bełchatów lignite mine, respectively. HA was isolated according to the IHSS method described by Trubetskaya et al., [ 30 ] with some modifications.

Extraction. Les gisements de lignite sont insérés dans des sédiments continentaux (sables et argiles) relativement proches de la surface terrestre (quelques mètres ou …

BACKGROUND. In view of the low economic benefit for direct utilization of lignite, the ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) has been used to extract Inner Mongolia lignite (IML) in order to efficiently separate lignite, develop the technology for clean and value-added utilization of lignite, and alleviate the enormous pressure of …

Formic acid can promote the extraction of FA from lignite by hydrogen peroxide, and under optimal experimental conditions, the yields of FA were 5.34% and 9.13%, respectively. UV-Vis analysis shows that FA has a lower aromaticity and degree of carbonyl conjugation in the presence of formic acid.

The decision of the German federal government to cease lignite mining until 2038 or—if possible—already earlier until 2030, will cause manifold transition processes in the remaining lignite mining districts of Germany. The two largest districts are located in geographically opposite regions: The Rhineland in the western part and Lusatia in the …

Shengli lignite (SL) was sequentially extracted with aqueous NaOH solution, n-hexane, dichloromethane, an azeotropic mixture of benzene and ethanol, and acetone to obtain extracts 1–5 (E1–E5). Each extract was analyzed using a gas chromatograph/mass spectrometer (GC/MS) and then depolymerized by an isolated fungus. Most of E1 …

Based on the characteristics of the lignite sample, effects of assistant anthraquinone (AQ) on extraction yield of humic substances (HS) and the action mechanisms of AQ in alkaline condition were studied by Fouvier transform infrared (FT-IR) spectroscopy. The results indicate that assistant AQ can not only increase the extraction yield of HS but also …

Cire d'extraction de cire de lignite continue. Convoyeur envoie le lignite séché dans l'extracteur continu. L'ajout d'un solvant organique avec un rapport de poids de ( 1-1,4 ): 1 lignite va extraire la cire de lignite après la pénétration, tremper, rincer et sécher.

On peut évaluer à 200 millions de kilowatts la fourniture annuelle de la centrale d'Hostens pour une extraction de lignite de 700 000 tonnes. La centrale fonctionne en liaison avec les hydrauliques des Pyrénées, avec un rythme assez particulier, unique en France. Elle marche à pleine puissance, sans aucune réserve, pendant les mois d ...

Baiyinhua lignite (BL) was sequentially extracted and thermally dissolved in isometric CS 2 /acetone and toluene/methanol binary solvents to obtain an extract in isometric CS 2 /acetone (E ICA) and a soluble portion (SP) in isometric toluene/methanol (SP ITM).The yields of E ICA and SP ITM are notably higher than the total extract yield from …

Zhang et al. [18] used HCl and MnO 2 to extract Ge from fly ash obtained via vacuum reduction with a 92 % recovery rate. The direct Ge extraction from lignite using chlorinated distillation is uneconomical because of its dispersed distribution in coal [19]. Thus, an economical pre-enrichment of Ge is crucial before chlorinated distillation.

Lignites are abundant coal resources, but they are low-quality fuel for direct combustion because of their high moisture content, high ash yield, and low calorific value. Upgrading …

NETL experts recently joined U.S. Department of Energy (DOE) Office of Fossil Energy and Carbon Management (FECM) leaders in North Dakota to learn about the development of technologies that can harness the state's massive reserves of lignite coal to extract key rare earth elements (REEs) and critical minerals (CMs), which are needed to …

La chronologie de l'extraction houillère, tributaire de ses utilisations pour la fonte puis l'acier, ... 1800 : 11,2 millions de tonnes et de charbon et de lignite produites en Angleterre. 1802 : Les premières machines d'extraction à vapeur sont …

The nitrogen-doped lignite alkali extract has a large specific surface area, which facilitates ion transportation and electron transfer. Among these materials, the specific capacitance of N-Lignite alkali extract (433.5 F/g) at a current density of 1 A/g is much higher than N-Nanofiber (202 F/g).

For agricultural objectives, such as soil enrichment, enhancing plant growth conditions, and creating green energy solutions, this acquired HA can be made bioactive. This study not only establishes a basis for research into the optimized extraction of HA from lignite coal, but it also creates a new avenue for the efficient and clean use of lignite.

Previous awards to UND have resulted in discovering which elements are in lignite and finding new methods of extraction. A 2017 award of $2.75 million enabled researchers to scale up the lab with the goal of producing a 2 percent concentrate of REE from lignite. Instead, researchers exceeded the goal and were able to produce a concentrate with ...

Translations in context of "extraction de lignite" in French-English from Reverso Context: En Grèce, DEI (ΔEH) déploie une intense activité d'extraction de lignite destiné à la production d'électricité.

Extraction of fulvic acid (FA) from Hulun Buir (HB) lignite were carried out under the conditions of hydrogen peroxide and microwave-assisted hydrogen peroxide. The results showed that the microwave can greatly improve reaction rate and observably shorten reaction time, while the extraction yield of FA increased around 4%. Purification …