Product Feature Through recrystallization, FeSO4·H2O is highly purified, with few impurities (Fe≥31%). NO.2 Content of ferric iron is low, less than 100pm. Compared with Longmang company, its content is 200-300ppm. No.3 Granularity of 95% is over 80 meshes, and granularity of Longmang iron ...