Valorization of lignite wastes into humic acids: Process
The present work investigates the optimization of humic acids (HAs) production from lignite processing wastes using a developed mechanical agitated (MA) tank reactor based on the results of response surface methodology (RSM). The structures of The present work investigates the optimization of humic acids (HAs) production from lignite processing wastes using a developed mechanical agitated (MA) Valorization of lignite wastes into humic acids: Process
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Extraction and purification of humic acids from lignite wastes
Humic acids (HAs) are high molecular weight biopolymers generally obtained from humic compounds of organic matter distributed in the soil, peats and Bio-solubilization of lignite is a promising technology to transform coal into humic acids (HAs) which are broadly used in agriculture. In this work, HAs were extracted from lignite Extraction optimization and quality evaluation of humic acids
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Characterization of humic acids from original coal and its oxidization
Humic acids (HAs) is a mixture of natural amorphous colloid formed through various biological and abiotic degradation processes of animal and plant Open Access Article Extraction of Humic Acid from Lignite by KOH-Hydrothermal Method by Gan Cheng 1,2,*, Zeyu Niu 3, Chuanxiang Zhang 1,2,*, Xiaoming Zhang 1 and Xusheng Li 4 1 College of Chemistry Extraction of Humic Acid from Lignite by KOH
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Extraction and purification of humic acids from lignite wastes
In general, the production and purification of HA is based on the elimination of insoluble humin microparticles from the products of an alkaline extraction Structural elucidation of humic acids extracted from Pakistani lignite using spectroscopic and thermal degradative techniques Fuel Process. Technol.,92 ( 2011 ),Structural analysis of lignite-derived humic acid and its
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Efficient Oxidative Depolymerization of Xilinguole Lignite to
To reduce CO2 production, an oxy-cracking technique in weak alkaline aqueous was conducted to selectively depolymerize Xilinguole lignite (XL) into humic Current research focuses on extracting humic acid (HA) compounds from low-rank coals to obtain high value-added products. In this study, HAs with high purity and low heavy metal content were obtained from lignite by Extraction of Humic Acids from Lignite and Its Use
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(PDF) Extraction of Humic Acid from Lignite by
A KOH-hydrothermal method was used to extract HA from Inner Mongolia lignite. The maximum. HA yield (90.2%) was obtained from the 0.250–0.180 mm size fraction of the coal sample at a reactionAbstract At present, non-fuel utilization as alternative chemical feedstocks becomes very important and significant for the efficient conversion of lignite. To reduce CO2 production, an oxy-cracking technique in weak alkaline aqueous was conducted to selectively depolymerize Xilinguole lignite (XL) into humic acid (HA) under mild condition Efficient Oxidative Depolymerization of Xilinguole Lignite to
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Extraction and purification of humic acids from lignite wastes
The cleaner production of high purity and safe humic acid (HA) with very low concentration of heavy metals leads to achieve a final product with potential economic value in agriculture, biomedicine, environment and so on. This can be obtained by environmental-friendly separation of low molecular weight fulvates and inorganic The nitro-humic products showed lower heavy metals with higher micropores-mesopores in a globular-like and heterogeneous porous structure. The proposed method could increase the process energy efficiency by 59.91% while discounting the production costs by 43%.Highly humified nitrogen-functionalized lignite activated by
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Extraction of Fulvic Acid from Lignite and Characterization of
Abstract. Fulvic acid (FA) is a complex organic mixture composed of small molecules. The structure and composition of FA vary greatly because of the different raw materials used for preparing FA. In this work, FA was extracted from shallow low-rank lignite by hydrogen peroxide (H 2 O 2) in a microwave field, and the functional groups of FA Nitro humic acid was extracted from lignite of Guizhou Anshun, which production condition and process were studied. The results show that the optimum conditions of dry process are concentration of nitric acid of 40%, reaction temperature of 95°C, reaction time of 5 min. The optimum conditions of wet process production are Extraction Study of Nitro Humic Acid from Lignite by Dry and Wet Process
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Extraction and characterization of humic acid from coal for
Humic acid may significantly differ regarding its inorganic constituents, depending on the differences in extraction and purification process. In general, HA ashes consist mainly in components of Si and Al; smaller amounts of alkaline/alkaline earth elements, Fe and Ti, as well as trace amounts of heavy metals [9] .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.Extraction of Humic Acids from Lignite and Its Use as a
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Parametric optimization and structural feature analysis of humic acid
The acid extraction method has many impurities due to which this method is not much practiced and hence humic acid production is restricted. has been presented for optimizing HA extraction from Pakistani lignite coal. Optimizing the best process conditions resulted in the highest HA extraction efficiency of 89.32% and 87.04% for coalHumic 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 Extraction of Humic Acid from Lignite by KOH
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Production of artificial humic acid from biomass residues by
Humic substance is vital for soil fertility and has wide applications such as soil remediation agents, organic fertilizer and adsorbents. The results of pH effect on artificial humic acids (AHAs) production demonstrated that acid hydrothermal conditions are favorable for biomass waste dissolution and formation of AHA precursors such as 3.1.2. Variation of humus precursor concentration. Amino acids (AA), reducing sugars (RS), and polyphenols (PP) are important precursors of humus (Guo et al., 2019).According to the polyphenol-protein theory, amino acids and polyphenols can form humic substances, and amino acids can also form humic substances with sugars through Lignite drove phenol precursors to participate in the
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Frontiers Understanding the Role of Humic Acids on Crop
Humic acids (HA) are organic molecules that play essential roles in improving soil properties, plant growth, and agronomic parameters. The sources of HA include coal, lignite, soils, and organic materials. Humic acid-based products have been used in crop production in recent years to ensure the sustainability of agriculture production. Reviewed literature shows Humic bio-stimulants when synthesized from peat, composts and vermicomposts are more responsive than humic substances derived from lignite, leonardite and sub-bituminous coal (Casimiro et al., 2001). Although humic substances shows a positive response in growth and development of most of the plant species, their effects Humic Acids as Bio-stimulants SpringerLink
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Two-step hydrothermal conversion of biomass waste to
Converting biomass materials to humic acid is a sustainable method for humic acid production and achieve biomass valorization. A two-step hydrothermal treatment method was adopted in this study to produce humic acid from corn stalks. In the first step of the process, hydrochar was prepared at different hydrothermal temperatures and pH values.It is shown in Fig. 4 that the peak area and peak of humic acid in the MEC-AD reactor are much higher than the control reactor, representing that the applied voltage can enhance the production of humic acid from lignite and the output efficiency is varied for different applied voltages. It is obvious that the area of the fluorescence peak isInvestigating the performance of different applied voltages on lignite
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Structural features of lignohumic acids ScienceDirect
The composition and structure of humic acids isolated from lignohumate, which is produced by hydrolytic–oxidative conversion of technical lignosulfonates, were characterized by chemical and spectral methods (UV/VIS, FTIR, and 13 C NMR spectroscopy). As comparative samples, humic acids (HA) were isolated also from lignite The weakest component in the pyrolysis process was the HA bridge bond, which easily produced free radical fragments, followed by the side bond, which formed gaseous hydrocarbons. Parametric optimization and structural feature analysis of humic acid extraction from lignite. Environ. Res., 220 (2023), pp. 115160-115172. View in Structural analysis of lignite-derived humic acid and its
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Hydrothermal humification of lignocellulosic components:
Hydrothermal humic acid (HHA) can be produced from biowaste after acid-alkali two-step hydrothermal treatment [23]. This part investigated the humification behavior of the major lignocellulosic components ( i.e., cellulose, hemicellulose and lignin) under this hydrothermal process. And the trials denoted C, H and L, respectively.
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