Process for producing humic acid from lignite

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  Exploration of the H2O2 Oxidation Process and

  ·To study the effect of H 2 O 2 on the content and properties 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 and % respectively The HAs

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  Extraction of humic acid from peat and lignite and the

  ·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

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  Changes of chemical properties of humic acids from crude

  ·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

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  Extraction and characterization of humic acid from Pakistani lignite

  ·ABSTRACT This study deals with the extraction and characterization of humic acids from low rank coals of Thar Chakwal and Quetta Three respective coal samples were initially oxidized with 2% HNO 3 and then treated with 3 and % KOH solutions for the extraction of humic acid The % concentration of KOH was found to

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  Method for producing humic acid salts Justia Patents Search

  ·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

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  Highly humified nitrogen functionalized lignite activated by

  ·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

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  Extraction and Chemical Characterization of Humic Acid from Nitric Acid

  Currently conversion of coal into alternative fuel and non fuel valuable products is in demand and growing interest In the present study humic acid was extracted from two different ranks of coal low rank and high rank lignite and bituminous through chemical pretreatment by nitric acid

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  Characterization of humic acids from original coal and its

  ·Introduction Humic acids HAs is a mixture of natural amorphous colloid formed through various biological and abiotic degradation processes of animal and plant residues 1 which are featured by complex molecular structure chemical composition chemical reactivity and decomposition resistance widely exist in soil coal and

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  Review Biotic and abiotic approaches to artificial humic acids

  ·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

  Binderless briquetting technology for lignite briquettes a

  ·However little attention is paid on the process of producing good quality briquettes without the use of binders This process is generally referred to as binderless technology The granular humic acid bonds the lignite particles together and forms intermolecular cohesion under the influence of external force Cohesions possess charge;

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  Advances and challenges in humic acid production

  2 ·The reaction mechanisms and functionalization of humic acids are thoroughly detailed • Catalytic oxidation and free radicals can uniquely enhance humic acid production • Hydrothermal conversion offers energy efficient high yield humic acid production • Circular economy strategies for the artificial synthesis of humic acids are discussed

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  Extraction of Fulvic Acid from Lignite and

  · 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

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  Exploration of the H2O2 Oxidation Process and Semantic

  ·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 and % respectively

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  Production of artificial humic acid from biomass residues by

  ·Acid hydrothermal treatment of biowaste is a beneficial approach for producing hydrochar with high hydrothermal humic acid HHA selectivity along with a by product hydrothermal solution

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  Activation of Humic Acid in Lignite Using Molybdate

  ·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

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  Enhanced production of hydrothermal humic acid in a two

  ·The process scheme of humic acid production in a two step hydrothermal process with acid hydrothermal solution recycling In addition to producing HHAs from hydrochar Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers J Soil Sediment 18 8

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  Extraction of Humic Acid from Lignite by KOH Hydrothermal

  ·Humic 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 time on the HA yield were investigated

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  Molecular Characterization of Size Fractionated Humic Acids

  Humic acid HA has been widely used in agricultural production processes because it improves soil nutrients and has a growth promoting effect on plants Understanding the relationship between the structure and function of HA is the key to efficient utilization of HA in the field of activating soil legacy phosphorus P and promoting crop growth In this work

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  Valorization of lignite wastes into humic acids Process

  ·1 Introduction Low rank coals LRCs such as lignite or brown coal leonardite highly oxidized lignite and peat coals as abundant fossil fuel sources are formed during the coalification process and their global reserves are approximately 500 billion tons [[1] [2] [3]] Lignites are intermediate products between peat and bituminous

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