1、Advances and challenges in humic acid production technologies from

Hydrothermal conversion offers energy-efficient, high-yield humic acid production. Circular economy strategies for the artificial synthesis of humic acids are discussed.

2、Extraction and chemical characterization of humic acid produced from

In the current study, extraction of humic acid (HAs) from lignite fines of kutch basin of Gujarat (western India) were reported.

3、Humic substances derived from unconventional resources: extraction

The result of the study showed that a 42.6% humic acid yield was obtained from lignite coal while a 31.7% humic acid yield was obtained from bituminous coal using 4.5% KOH.

4、Advancing humic acids extraction procedures: A review of methods

Various types of humic acids could be derived from several types of low rank coals, such as lignite. The methods of extraction from these low rank coals are somewhat similar to other natural sources of peat and leonardite. Leaching, filtration, acidification, and drying are part of the processing.

5、A COMPREHENSIVE REVIEW OF HUMIC ACID PRODUCTION

Humic acids (HAs) are vital organic compounds derived from the decomposition of plant and animal matter, playing a crucial role in soil fertility, plant growth, and environmental remediation.

Define Humic Acid: What It Is & How It Forms

Define humic acid and explore its natural formation process from organic matter. Learn its role in soil health, plant nutrition, and sustainable agriculture.

What are Humic Acids and their sources?

The best source of humic acids are the sedimentation layers of soft brown coal, which are referred to as Leonardite. (pic.1.2, pic.1.3) Humic acids are found in high concentration here.

Characterization of humic acids from original coal and its

Humic acids (HAs) is a mixture of natural amorphous colloid formed through various biological and abi-otic degradation processes of animal and plant residues1, which are featured by complex...

What Is Humic Acid?

Humic acids are complex molecules that exist naturally in soils, peats, oceans and fresh waters. The one source of humic acids are the sedimentation layers referred to as Leonardite.

Humic substances derived from unconventional resources: extraction

The result of the study showed that a 42.6% humic acid yield was obtained from lignite coal while a 31.7% humic acid yield was obtained from bituminous coal using 4.5% KOH.

Mineral-derived humic acid is a natural organic substance primarily formed through the decomposition, transformation, and accumulation of various plant and animal residues under microbial action over extended periods. Its production is a complex biochemical process involving multiple disciplines, including microbiology, soil science, and chemical engineering. Below is the general production process of mineral-derived humic acid:

1. Raw Material Preparation: The production relies on organic-rich raw materials, such as plant residues, animal manure, and compost. These materials undergo appropriate treatment and preprocessing to facilitate microbial decomposition and mineralization.

2. Fermentation Process: Preprocessed raw materials are placed in fermentation tanks, and suitable microbial strains (e.g., bacteria, fungi) are added. By controlling factors such as temperature, humidity, and pH, microbial growth and metabolic activities are promoted. During this stage, organic matter in the raw materials is broken down into smaller molecules, such as amino acids, sugars, and fatty acids.

3. Mineralization Process: With sustained microbial action, recalcitrant substances gradually transform into soluble components, such as humic acid. This process is termed mineralization. The extent and speed of mineralization depend on various factors, including microbial species, quantity, activity, and environmental conditions.

4. Extraction and Separation: The mineralized mixture typically contains multiple organic and inorganic components. To obtain pure mineral-derived humic acid, extraction and separation methods—such as solvent extraction, ion exchange, or membrane separation—are employed. These techniques effectively remove impurities and enhance the purity of the product.

5. Post-Processing: The extracted humic acid may still contain low-molecular-weight organic compounds that could affect its performance. post-processing steps like concentration, drying, and pulverization are conducted to improve quality and stability.

6. Packaging and Storage: Finally, the humic acid is packaged and stored according to specific standards to ensure quality and safety. Packaging materials must have good air permeability and moisture resistance to prevent microbial growth and oxidation. Storage conditions require a cool, dry, and well-ventilated environment, avoiding direct sunlight and high temperatures.

the production of mineral-derived humic acid is a sophisticated biochemical process spanning microbiology, soil science, and chemical engineering. High-quality products can be achieved through optimal raw material selection, refined fermentation conditions, efficient extraction techniques, and rigorous post-processing and storage protocols.