How to make potassium humate from lignite coal?

To make potassium humate from lignite coal:

Crush the Coal: Start by crushing the lignite coal into a fine powder to increase surface area for extraction.
Alkaline Extraction: Add potassium hydroxide (KOH) to the powdered lignite coal in a large container. The alkali dissolves the humic and fulvic acids present in the coal, producing a potassium-rich solution.
Stirring and Heating: Heat and stir the mixture to speed up the reaction and extract more humic acid from the coal.
Filtration: After sufficient extraction, filter the mixture to separate the humic acid solution from the solid residue.
Neutralization: Neutralize the solution to stabilize the potassium humate, making it safe for agricultural use.
Drying (Optional): The potassium humate solution can be concentrated and dried to produce powder or granules.
This process allows for the efficient production of potassium humate from lignite coal.