A method for increasing the yield of the suitable product of humic acids from raw materials using pulse-magnetic processing

Abstract

Abstract The paper studied the effect of high-intensity pulsed magnetic fields (PMF) on extraction of humic acids in order to increase the yield of the suitable product. It is proposed to add to the technological chain of reactions for the precipitation of humic acids the operation of PMF processing of raw materials at the stage of the brawn coal suspension in alkali (the first experiment) or the alkaline extraction suspension (the second experiment).Pulse-magnetic processing the brawn coal suspension in alkali and the alkaline extraction suspension was carried out at magnetic field intensities H=0.09 106 A/m and H=0.82 106 A/m with the frequency of the discharge circuit f=40 kHz and the number of pulses n=1. The experiments have shown that when humic acids are obtained by water-alkaline extraction followed by their precipitation in an acid medium, for the highest yield of the product it is necessary to add the operation of pulse-magnetic processing a raw material at the magnetic field intensity of 0.82 106 A/m at the stage of the brawn coal suspension in alkali. It can be assumed that a high-intensity PMF contributes to the transfer of humic acids to a state conducive to their more efficient precipitation and extraction.