Définition. Le lignite, appelé aussi houille brune, résulte généralement de la fossilisation de substances ligneuses (bois), ou encore de la maturation de la tourbe. Celle-ci résulte de la forte activité biologique qui se développe dans les zones humides, à partir de végétaux herbacés et de mousses constituant progressivement un ...
A correlation coefficient R 2 of 0.9959 and an adjusted correlation coefficient R 2 (Adj) of 0.9906 obtained for the model (Table 4) demonstrates good simulation capabilities with high accuracy ...
It was also found that seedling vigour index of green gram (CO 3) was paramount in response to coconut shell based biochar. In addition, coconut shell based biochar was found to increase the survival of Azospirillum lipoferum upto 180 days (6 months) of storage period at a required population compared to acacia wood based biochar and lignite.
When the dosage of lignite (particle size is 200 mesh), Rhodopseudomonas, and SRB are 3%, 10%, and 10% mesh, the prepared biologically …
There is a frequent coexistence of Cr(VI) with other anions in natural water bodies, which may affect the removal of Cr(VI) by nFeS@Lignite. In this study, the common ions in water (NO3−, PO43−, SO42−, and Cl−) were selected to … See more
This study aimed to increase the ammonium nitrogen adsorption capacity of lignite using ultrafine grinding, aiming to reduce eutrophication in water bodies. Ammonium sulfate (NH4)2SO4 was employed as a stand-in for ammonium nitrogen in water solutions. The lignite sample for adsorption was processed with varying milling times. Adsorption …
In this study, syngas preparation by chemical looping gasification (CLG) process is investigated through theory and experiment. The starting materials for the …
Due to poor hydrophobicity, large amounts of petroleum-based collectors are required for upgrading lignite. In this paper, Waste Hot-pot Oil (WHPO) collectors from the catering industry were prepared via filtration, heating, and catalysis. The catalytic experiment was optimized using the Design-Expert software. The optimum catalytic conditions were …
Variété de lignite. — Solutions pour Mots fléchés et mots croisés. Il y a 1 les résultats correspondant à votre recherche. Cliquez sur un mot pour découvrir sa définition. Solution. Longueur. Variété de lignite avec 4 lettres. jais. 4.
Lignite is a low-quality energy source which accounts for 13 % of China's coal reserves. It is imperative to improve the quality of lignite for large-scale utilization. To further explore and analyze the influence of various key processes on the environment and economic costs, a lignite drying and compression technology is evaluated using an …
A series of porous carbons (PCs) were obtained from Shengli lignite (SL) via hydrothermal carbonization (HTC) pre-treatment and followed by chemical activation with KOH. The effects of preparation parameters including HTC temperature, KOH-hydrochar ratio and activation temperature on pore structure and the electrochemical performances …
Sample preparation. Lignite particles were dried in an oven at 105° C for 12 h and were crushed by a rod mill. Two kinds of size distribution particles were obtained by screening through 40 and 200 mesh sieves. Coarse and fine particles were mixed at a mass ratio of 6:4 in a disposable cup. The mass of dried lignite of a single sample is 40 g ...
Request PDF | Potential for Biochar as an Alternate Carrier to Lignite for the Preparation of Biofertilizers in India | Carrier based preparations of Azospirillum lipoferum (AZ 204) inoculant ...
China has 130 billion tons of lignite reserves, which accounts for 13% of the total lignite reserves in the world [9]. This lignite is located in Inner Mongolia, Yunnan, Heilongjiang, and other areas, with the Inner Mongolian reserves representing more than 75% [10], [11] .
The lignite pretreated by HTC is an excellent precursor for the preparation of PCs via KOH activation. The obtained PCs exhibit higher SSA and pore volume compared with the common preparation process in the absence of hydrothermal treatment. The porosity development and pore size distribution were extremely affected by the HTC …
The use of lignite can be a new cost-effective NH 3 abatement option as it not only achieves great benefits to the climate, human and ecosystem health (Bai et al., 2020;Ng et al., 2020) but also ...
In this study, lignite-loaded nano-FeS (nFeS@Lignite) was successfully prepared by ultrasonic precipitation, and its potential for treating acid Cr(VI)-containing wastewater …
Lignite samples were obtained from Xinjiang Autonomous Region, China. The proximate analysis is shown in Table 1 [38]. The main raw materials in this study were WHPO, kerosene, octanol, methanol, and sodium hydroxide. ... The preparation process of EWFOC was optimized, and its performance was compared to that of a common …
Meanwhile, we review progress in lignite flotation in recent years. In addition, we analysed lignite flotation methods, including grinding, reverse flotation, heating, microwaving, ultrasonic, oily-bubbles flotation and modification of collectors. The advantages and difficulties of the methods above are discussed from a molecular level.
A lignite-based activated carbon (LAC) for electrochemical capacitors (ECs) was prepared from high moisture lignite by KOH activation, and the as-prepared sample was characterized by the N2-sorption, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. …
Activated carbon (AC) is a porous carbon material with a developed pore structure and large specific surface area, which has been widely used in adsorption, catalysis, energy storage, etc. In this paper, the AC samples were prepared from Huolinhe lignite by the KOH activation method. The effects of the alkali-to-carbon ratio and activation …
1. Introduction. Lignite has a high ability of spontaneous combustion since the rich in oxygen-containing species (OCSs) [1], [2], [3].Due to abundance in OCSs, lignite was reported present high ion-exchanging ability with metal, such as Ni, and great dispersion of the Ni within the coal matrix [4], [5].. We previously reported a novel …
Coal-based activated carbon was prepared from lignite as raw material by potassium-catalyzed steam activation method. The synthesis process of coal-based …
Research advances in chemical looping technology for preparation of syngas by phosphogypsum and lignite July 2018 Xiandai Huagong/Modern Chemical Industry 38(7):67-70
Phosphogypsum (PG) is a solid waste. For a fluidized bed, current research has focused on the preparation of CaO and SO 2 by PG decomposition, while …
Also, Yang et al. [27] and Wang et al. [28] reported on the reaction mechanism for syngas preparation by lignite chemical looping gasification and the reaction of carbon with CO 2 and H 2 . ...
When the dosage of lignite (particle size is 200 mesh), Rhodopseudomonas, and SRB are 3%, 10%, and 10% mesh, the prepared biologically activated lignite-immobilized SRB particles have the best ...
Especially, by strictly controlling the preparation conditions (one-pot hydrothermal synthesis at 200 °C and 2 MPa for 1 h followed with pyrolysis at 700 °C for 1 h), they obtained a Ni/hydrochar with a Ni particle size of 8–13 nm, which achieves a sewage gasification efficiency of about 98.5 % and a H 2 yield of 109.2 g H 2 /kg sludge …
Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles
In this study, lignite-loaded nano-FeS (nFeS@Lignite) was successfully prepared by ultrasonic precipitation, and its potential for treating acid Cr(VI)-containing wastewater was explored. The results showed that the 40--80-nm rod-shaped nFeS was successfully loaded onto lignite particles, and the ma …
@article{Wan2022PreparationOH, title={Preparation of high-capacity macroporous adsorbent using lignite-derived humic acid and its multifunctional binding chemistry for heavy metals in wastewater}, author={Keji Wan and Yawen Xiao and Jinjin Fan and Zhenyong Miao and Guoqiang Wang and Shuwen Xue}, journal={Journal of …
Lignite, obtained from Inner Mongolia of China, was used as the starting precursor for the preparation of synthetic graphite materials. The raw coal was ground to powder and then sieved into a particle size of less than 74 μm. Lignite powder (LC), H 2 SO 4 and H 3 PO 4 were proportionally mixed (LC (g) : H 2 SO 4 (mL) : H 3 PO 4 (mL) = …
Lignite is expected to become a supercapacitor electrode material with higher specific capacity, higher speed, and better reversibility. SEM of BL and the samples: a BL, b AE, c AR, d BAC, e TEM ...
Alignite-based porous carbon was prepared by KOH solution extraction and subsequently by an activation of the extractant with Baoqing lignite as the raw material, …
Saskatchewan lignite was used as a precursor to prepare carbonaceous adsorbents for use as SO 2 adsorbent from flue gases.The lignite was carbonized producing char in a fixed bed microreactor system at different temperatures from 350 to 550 ° C in nitrogen atmosphere. The chars obtained at 475 ° C for 120 min exhibited the …
In this study, lignite fly ash was received from coal-fired power plant NLC India Limited, Barsingsar Rajasthan, India. Using a 250 µm mesh the lignite fly ash was sifted. The ball clay was procured from a local mine of Bikaner, Rajasthan, India. Sawdust was used as a pore former which was collected from a local vendor as waste materials. …