关键词: 钛白副产物, 硫酸亚铁, 氧化合成, 前驱体, 煅烧, 氧化铁红

Abstract: In order to find a new way of iron oxide red for soft magnetic ferrite and realize the comprehensive utilization of ferrous sulfate， ferrous sulfate purification solution of titanium by-product was used as the raw materials for synthesis of α-Fe2O3. Firstly， precursor was prepared by oxidation synthesis in liquid-phase through regulating pH value with ammonia solution， then the precursor production was calcined for preparation of the iron oxide red. The effects of pH value， initial Fe2+ concentration， calcination temperature and calcination time on the crystal structure， crystal morphology， impurity contents and specific surface area of the products were investigated by XRD， SEM， ICP， high frequency infrared carbon sulfur analyzer and specific surface area analyzer. The results showed that at initial Fe2+ concentration of 70 g/L， the precursor of high purity， low impurity contents and large specific surface area was obtained by accurately controlling the feeding speed of ammonia for ensuring the pH value of the system maintained within 5.0. Then， the precursor production was calcined of 2 h under the temperature of 760 ℃， the high quality iron oxide red product of Fe2O3 purity of 99.68%， SiO2 contents of 0.005 4%， S contents of 0.032% and specific surface area of 3.576 m2/g was obtained， which was the ideal raw material for the production of high-performance soft magnetic ferrite.

Key words: titanium by-products, ferrous sulfate, oxidation synthesis, precursor, calculated, iron oxide red