A method of purifying extracted phosphoric acid containing substantially no metallic impurities which comprises:(a) adjusting the phosphoric acid concentration to from 20 to 65 wt.% as P.sub.2 O.sub.5,(b) adjusting the Si/F atomic ratio in said extracted phosphoric acid to less than 0.2; and(c) contacting said extracted phosphoric acid with silica gel at a temperature of 20.degree.-100.degree. C. to remove the dissolved silica from said extracted phosphoric acid; and(d) recovering extracted phosphoric acid having a reduced silica content.