OBTAINING A MODIFIED SORBENT FROM HUMIC SUBSTANCES OF BROWN COAL, KENDYRLYK DEPOSIT

Abstract

Humic substances play one of the major roles in agricultural sector of Kazakhstan as one of the main fertilizers. Brown coal mined in Zaysan could be used as a feedstock to produce humates. Various technologies of extraction of humic subtances from coal have been developed, however, considering the complexity of the chemical composition of the local (Zaysan) brown coal, these technologies need to be improved and adapted. In this research project humic acids were obtained from Zaysan brown coal. The coal samples were initially activated by sulfuric and hydrochloric acids. Activated samples were used to extract humic acids by hydroxide and pyrophosphate methods. Quantitative analysis shows that the optimal conditions that give the maximum amount of humic acids are activation by sulfuric acid with the ratio of solid to liquid phases of 1:8, temperature of 40 °C and extraction by pyrophosphate method.