For potassium humate production I recommend using the GlobeCore AVS vortex layer device instead of a colloid mill. AVS intensifies alkaline extraction of humic substances by activating particles in an electromagnetic vortex layer, which significantly increases yield and reduces processing time. It does not use a rotor-stator gap; process control is achieved by the electromagnetic field and working elements. A typical line is: mixing tank (raw material + KOH) ? AVS (inline or recirculation) ? solid separation ? fine filtration. AVS-100 or AVS-150 can be selected depending on the required capacity.

One noteworthy aspect is feedstock quality and consistency. Different sources of peat, leonardite, lignite, or other humic-containing materials can vary significantly in humic acid content, mineral composition, and particle size, which directly affects extraction efficiency and the properties of the final potassium humate solution. For this reason, many producers optimize residence time, alkali concentration, and recirculation intensity for each feedstock rather than relying on a single processing formulation.
It is also beneficial to include an effective solid-liquid separation stage after extraction, as reducing the amount of suspended solids can improve product stability, facilitate storage, and simplify downstream application in agricultural systems. For reference, the image below shows an AVS-100 vortex layer machine, which is commonly used for process intensification in humic substance extraction and other dispersion-related applications.

You’re absolutely right: feedstock quality and consistency are decisive for extraction efficiency and final potassium humate quality. With variable peat, leonardite or lignite you should standardize incoming material by routine sampling (humic content, ash/mineral content, moisture and particle size) and use a simple pretreatment strategy — screen and mill to a consistent particle size (aiming to break particles down to the low millimeter range or finer), control slurry solids content, and heat the charge moderately if possible — then optimize alkali strength, residence time and recirculation for each feedstock. Using the AVS vortex layer device (AVS-100 for pilot/smaller throughput or AVS-150 for higher capacity) in inline or recirculation mode lets you intensify alkaline extraction without a rotor-stator gap; tune the recirculation intensity and run time on each feedstock to maximize dissolved humic yield while minimizing fines.

A robust solid–liquid separation stage after AVS treatment materially improves product stability and handling. Start with coarse separation (settling/decantation or a screw press) to remove large solids, then move to fine dewatering/clarification such as a decanter centrifuge or filter press, and finish with fine filtration (bag/cartridge, or membrane/ultrafiltration when you need low suspended solids and concentration control). Maintain alkaline pH and controlled temperature during extraction to reduce precipitation and biological activity, and put a simple QC loop in place (total humic/fulvic, ash, particle size, pH) so you can lock in operating parameters per feedstock. If you want, I can put together a preliminary line layout and suggest starting throughput and trial parameters for a given feedstock and target production rate using AVS-100 or AVS-150.