Abstract:
In this research project, humic acids were obtained from activated coal samples by hydroxide and pyrophosphate methods. Activation was done using hydrochloric (HCl) and sulfuric (H2SO4) acids. Quantitative analysis shows that the optimal conditions that give the maximum yield of humic acids are activation by sulfuric acid with 1:8 ratio of solid to liquid phases, temperature of 40°C and extraction by pyrophosphate method. Coal samples were prepared according to the state standard 10742-71. The coal samples were activated by HCl and H2SO4 with solid to liquid ratio of 1:5, 1:8, and 1:10. The activation stage was performed at 25°C and 40°C. After the activation stage humic acids were extracted by hydroxide and pyrophosphate methods according to the state standard 9517-94.
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