قائمة طعام
تطبيق كسارة المخروطية، كسارة التأثير، كسارة الفك، آلة صنع الرمل، محطة التكسير المتنقلة ومطحنة الكرات في إنتاج سحق وطحن الحجر.
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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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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;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
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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;Compared to biohumification process, the advantage of abiotic humification in producing humic-like acid is that the structural characteristics of the produced humic-like acids can be manipulated[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 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
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
0183;1. Introduction. Humic acid (HA) is a mixture of macromolecular organic compounds naturally formed through the decomposition and transformation of plants by microorganisms, followed by long-term geochemical processes. 1 This compound possesses numerous reactive functional groups, such as carboxyl and phenolic hydroxyl groups, which[سؤال
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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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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;Corn stalk was used as raw material in this research [11]. Humic acid (HA) from Suwannee river (3S101H) purchased from the International Humic Substances Society (IHSS) and another typical commercial HA purchased from Sinopharm (China) were used as standard HAs for comparison with the hydrothermal humic acid (HHA) synthesized during the hydrothermal[سؤال
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
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
0183;Feature papers represent the most advanced research with significant potential for high impact in the field. A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications.[سؤال
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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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176;C) with extended durations ranging from 4 to 24 h. Extraction of humic acid from lignite by KOH-hydrothermal method. Appl. Sci., 9 (7) (2019), p. 1356. Crossref View in Scopus Google Scholar. Crowell, 2022.[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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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
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;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;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
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;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
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;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;Humic acids (HAs) is a mixture of natural amorphous colloid formed through various biological and abi- otic degradation processes of animal and plant residues 1 , which are featured by complex[سؤال
0183;Lignite humic acids (LHAs) were sequentially separated from lignite with aqueous NaOH and HCl and biotreated by an isolated fungus WF8. The liquid product (LP), residues (RS) and LHAs were analyzed using a Fourier transform infrared spectrometer (FTIR) and a proton nuclear magnetic resonance (1H NMR). Three main enzymes in WF8 (i.e., lignin[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[سؤال
