قائمة طعام
تطبيق كسارة المخروطية، كسارة التأثير، كسارة الفك، آلة صنع الرمل، محطة التكسير المتنقلة ومطحنة الكرات في إنتاج سحق وطحن الحجر.
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&
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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
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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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;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;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;Humic acids (HAs) play an important role in many geochemical, biological, and biochemical processes. They are powerful geochemical agents that facilitate the decomposition of rocks and minerals, the concentration, dispersion, and repeated deposition of elements in the earth’s crust, in particular, due to the natural removal of metal ions from water bodies as[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
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.سؤال0183;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;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;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;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
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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;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
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
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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
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;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
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;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 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;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;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;Appl. Sci. 2019, 9, 1356 3 of 13 acid contents were 73.23% and 8.98%, respectively. HA could be broken up into two soluble and two insoluble fractions by successive dissolution in deionized water[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
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;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
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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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