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2 Oxidation Process and Characteristic Evaluation of Humic Acids from Two Typical Lignites of humic acids (HAs) in lignites, the experimental conditions including oxidation time, H 2 O 2 concentration, and the solid−liquid ratio were investigated. Under the optimum oxidation conditions, the contents of HAs of YL and HB lignite were 45.4
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0183;Effect of Lignite Addition on Moisture Content in the Process of Sheep Manure Producing Biochemical Humic Acid. The content of biochemical humic acid in 10% lignite increased from 15.5% to 30.0% on the 12th day, which was 13.125% higher than that in the blank group. The contents of total humic acid, free humic acid, water-soluble humic acid[سؤال
0183;The aim of this study was to determine the influence of the humic acids extracted from peat and lignite on the thermal decomposition of HA and the thermal decomposition of ammonium nitrate and[سؤال
0183;Key words: humic acid; biomass; lignite; co-thermal oxidation; 13C NMR Humic acid (HA) is a natural macromolecular mixture composed of one or more condensed aromatic nuclei that are randomly linked by bridging bonds to various functional groups such as carboxyl, quinone, and phenolic hydroxyl groups[1].[سؤال
0183;To study the effect of H2O2 on the content and properties of humic acids (HAs) in lignites, the experimental conditions including oxidation time, H2O2 concentration, and the solid–liquid ratio were investigated. Under the optimum oxidation conditions, the contents of HAs of YL and HB lignite were 45.4 and 40.9%, respectively. The HAs extracted from oxidized and&سؤال
0183;Co-extraction of germanium and nitrogen-rich humic acid from germanium-rich lignite by ammonoxidation is generally extracted from coal fly ash produced by the combustion of germanium-rich lignite in industrial process. It is a direct approach for germanium enrichment from lignite, however facing the challenges of high carbon emission and[سؤال
237;r mine (South Moravian region, Czech Republic) resulted in oxidation of aromatic structures and cleavage of aromatic units. The hydrophilic fraction largely dominated the oxidation digest in both parental materials. The presence of polycyclic biomarkers α-Phyllocladane, De-A-lupane confirms theسؤال
0183;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 using the cell-free filtrate (CFF) of Penicillium ortum MJ51. The extraction method was optimized using response surface methodology (RSM) based on the interactive effects of nitric[سؤال
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The method of the present disclosure includes providing an organic compost material, combining the organic compost material with a crop to be grown, heating the organic compost material, combining the organic compost material with water, and extracting an aqueous liquid comprising humic acid and fulvic acid. The organic compost material may include straw and manure and
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0183;In order to provide key precursors for humic-like substances formation via alkaline hydrothermal pretreatment (AHP), this study introduced an innovative approach by incorporating sodium lignosulfonate (SL) into the AHP to boost the production of humic-like acid (HLA) and fulvic-like acid (FLA) from biomass wastes.[سؤال
0183;Given the high moisture content and low calorific value of lignite, non-fuel utilization for producing chemicals is an efficient and low-carbon utilization approach, and can also compensate for the limitation of petroleum supplies [[1], [2], [3]].In particular, it is of great significance for the production of oxygen-containing chemicals such as humic acid (HA),[سؤال
0183;Humic substances (HSs) have been proven as an effective additive for maintaining soil quality and improving fertilizer utilization [12].HSs are brownish-black or brown, amorphous, and polydisperse organic materials that are a major byproduct from the degradation process of dead plants and animals (Fig. 1 (a), (b)).Their formation process has three main[سؤال
0183;The precipitated humic acids were separated from the soluble fulvic acids by centrifugation (HA is insoluble in acidic medium). For the removal of inorganic contaminants, purification was carried out by adding 0.2 L of 5% HCl/HF solution 1:1 (v/v) to the HA. The mixture was stirred for 2 h and centrifuged.[سؤال
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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 using the cell-free filtrate (CFF) of Penicillium ortum MJ51. The extraction method was optimized using response surface methodology
Humic acid salts are produced, with a high output of useful products, by a liquid-phase oxidation of the mixture of an alkaline agent with a lignin-containing plant raw material having the total content of dry substances of 12-20 %, said oxidation being carried out in two stages. In a first stage, pre-oxidation is carried out at a temperature of 50-190 DEG C. and a pressure of 0.5-3
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Process for preparing regenerated humic acids from coal by means of the continuous oxidation on fluidized bed, characterized in that a coal of lignite, sub-bituminous or bituminous type is submitted to a preliminary oxidation under mild conditions in order to reduce the hydrogen content of said coal by an amount of 5 to 25% of hydrogen initially present in the starting coal, and that
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0183;Although solid-phase activation of lignite using a nanocatalyst has great potential in producing low-cost and sustainable humic acid, the large-scale application of this technology still faces challenges because of the high price and toxicity of the nanocatalyst. Additionally, the specific molecular[سؤال]
The humic liquid is produced from lignite extraction using alkali solution. Conventional humic acid is obtained by acidifying a humic solution using HCl. The purpose of this research is the formation of solid humic acid from lignite by ion exchange method using cation resin. The results showed that the addition of cation resin was able to reduce the pH from 14 to pH 2 as well as the
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A particular use for the humic acids in lignite comprises their conversion into long chain alkyl ammonium salts thereof, and especially with substituted ammonium salts in which at least one substituent is a straight hydrocarbon chain having from 12 to 22 carbon atoms. Process of solubilizing lignite and producing humates Publications (1
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0183;About 31.7% of humic acid was extracted from bituminous coal and 42.6% from lignite coal by using a 4.5% concentration of KOH, while 3.5% of used KOH concentration produces about 23.5% and 30.98%&سؤال
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the extraction process of humic acid from lignite waste, achieving the highest extraction efficiencyof 54.2% for HA during their study.11 Currently, the alkali-dissolution and acid-precipitation methods are primarily used to extract humic acid from organic substances such as coal. This method leverages the fact that
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237;r mine (South Moravian region, Czech Republic) resulted in oxidation of aromatic structures and cleavage of aromatic units. The hydrophilic fraction largely dominated the oxidation digest in both parental materials. The presence of polycyclic biomarkers α-Phyllocladane, De-A-lupane confirms the&سؤال
0183;The development of biological processes for fossil energy utilization has received increasing attention in recent years. There are abundance of lignite resources in China and the lignite, a low-grade coal, can be transformed by a Penicillium sp. After fungal transformation, the contents of humic acid and water-soluble humic material increased from[سؤال
0183;The humic acid extracted from lignite has good bioactivity and is suitable for producing humic acid-based fertilizers. Applications: Humic acid derived from lignite is commonly used in the production of potassium and sodium humates, soil conditioners, and fertilizers. Due to its abundant reserves and relatively low extraction cost, lignite[سؤال
0183;This study introduces a cost-effective, mild thermal abiotic humification method for producing highly humified artificial humic acids (AHAs) from lignin-rich biogas digestate. Derived from the anaerobic digestion of cattle manure, the digestate slurry undergoes an MnO 2-KOH-urea-enhanced humification reaction.[سؤال
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Humic acid has been extensively used in the fields like industry, agriculture, medicine, environment protection, etc. As a kind of potential organic resources that being developed and utilized, humic acid is drawing more and more attention from the world. China is abundant in coal resource; the lignite of China contains a lot of humic acid.
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0183;The non-fuel utilization of lignite is of great significance, and mild oxidative depolymerization is a promising approach for producing oxygen-containing chemicals. In this work, Xiaolongtan lignite (XLT) was used to investigate selective oxidation under mild conditions, with the aim of avoiding excessive oxidation and reducing alkali consumption. The results[سؤال
0183;structures of humic acids [28]. The addition of organic compounds to ammonium nitrate usually results in a signicant reduction of the temperature of the decomposition beginning, but in the case of the addi-tion of humic acids, the process may also depend on their chemical structure and the type of raw material from which they were extracted [29].[سؤال
0183;The positive effect of humic acids on the growth of plant roots is well known, however, the mechanisms and role of their physical structure in these processes have not been fully explained yet. In this work, South-Moravian lignite was oxidized by means of nitric acid and hydrogen peroxide to produce a set of regenerated humic acids. The elemental composition,[سؤال
0183;The hydrothermal oxidation of Yunnan lignite was carried out by adding H 2 O 2 and KOH activator to lignite by alkali dissolution acid precipitation method to obtain high content of fulvic acid. Under the action of •OH, •O 2 −, HO 2 • and other free radicals and energy, the fragmentation of C–O and C–H in lignite is promoted, and more aromatic structures are[سؤال0183;Humic acid, a complex mixture of macromolecular organic acids with multiple functional groups, has been widely used in agricultural production, soil environmental improvement, and other fields (Torres et al., 2014).At the same time, humic acid, as the main form of soil organic matter and an important component of the soil carbon pool, has an irreplaceable[سؤال
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