The selection of optimal conditions for the process of obtaining humic acid from brown coal

Abstract

The type of plant substance from which brown coal is formed and the conditions in which it forms largely influence its characteristics and properties. On account of a lower degree of coalification and calorific value compared to hard coal and a high content of humic substances, brown coal is becoming a valuable fertiliser component. Humic acids contained in brown coal are also found in the soil’s humus substances, and their beneficial sorptive and complexing properties are a factor speaking in favour of their use both in agriculture and in other branches of the economy. The article presents the manner of preparing a sample of brown coal in order to determine the content of humic acid intended in particular for use in making chemical fertilisers and for other applications, particularly in agriculture. The optimum conditions in which the amount of humic acid in the sample is the highest were determined. The influence of the proportions of water, KOH, and brown coal, temperature, and mixing time on the solubility of the sample of brown coal was analysed. The solutions were mixed in mixers built especially for this purpose. The solubility of brown coal in the prepared solutions was controlled UV-ViS spectrophotometrically.

Physico-Сhemical Parameters of Humic Substances of Brown Coal and their Effect on the Growth of Phoenix dactylifera

“…However, HA obtained directly from coal often has problems with low yield, high ash content, and a limited amount of active functional group (De Melo et al, 2016). As two determining factors, the choice of raw materials and the isolation procedure will affect the chemical nature and efficiency of extraction of the obtained HA from a potential organic source (Janeba-Bartoszewicz et al, 2019).…”