The invention discloses a process for extracting white
carbon black in alkaline-leaching and
vanadium extraction of stone
coal, which aims at solving the problem that no mature process for extracting white
carbon black from filter residues of the stone
coal, which are subjected to
sodium-free blank
roasting, alkaline leaching and
vanadium extraction, exists at present. The process comprises the following steps of: carrying out
sodium-free blank
roasting on the stone
coal, adding 3-7% of industrial alkali, soaking for 3-5 hours at 65-95 DEG C, putting the obtained lixivium to a white
carbon black reaction kettle, heating to 75-85 DEG C, simultaneously adding concentrated
sulfuric acid to adjust the pH to 5-6, stirring and maintaining for 0.5-1.5 hours, carrying out conventional pressure
filtration, simultaneously introducing hot water of 65-75 DEG C, conventionally pulping the obtained
filter cake, carrying out
spray drying to obtain the white carbon black, and carrying out
vanadium extraction on the obtained filtrate and
water washing liquid. The invention is used for extracting the white carbon black from the filter residues of the stone coal, which are subjected to
sodium-free blank
roasting, alkaline leaching and vanadium extraction, has the advantages of simple and convenient process, high extraction yield, good benefit and no environmental
pollutant emission, and realizes the comprehensive development and cyclic utilization of the stone coal.