Leonardite Premium
Leonardite is a soft waxy, black or brown, shiny, vitreous mineraloid that is easily soluble in alkaline solutions. It is an oxidation product of lignite, associated with near-surface mining. It is a rich source of humic acid (60-80%) and is used as a soil conditioner, as a stabilizer for ion-exchange resins in water treatment, in the remediation of polluted environments and as a drilling additive. It was named after A. G. Leonard, first director of the North Dakota Geological Survey, in recognition of his work on these deposits.
Leonardite Premium specification
| # | Indicator name | Indicator |
|---|---|---|
| 1 | Moisture | ≥35% |
| 2 | Ash, dry basis | ≥15% |
| 3 | Acidity pH | 4-7.5% | 4 | Total Humic Acid on dry organic matter | ~70% |
| 5 | Fulvic acid | 8% |
| 5 | Organic matter | 85% |
