关键词: 钛白粉, 硫酸亚铁, 晶种, 氧化铁黄, 颜料

Abstract: With ferrous sulfate by-product from the production of titanium dioxide as main raw material, iron oxide yellow was prepared. Not only the effects of mass ratio of NaOH to FeSO4×7H2O, initial Fe2+ concentration, aeration rate and temperature on the seed crystal, but also those of concentration of seed crystal, pH value and initial ferrous sulfate amount on the iron oxide yellow examined. The process conditions were optimized. The results showed that the production was 4.00 g, the productivity was 12.01 g/h, the seed crystal was claybank and colloid when the molar ratio of NaOH to FeSO4×7H2O was 0.5, initial Fe2+ concentration 0.7 mol/L, aeration rate 2.5 L/min and temperature 35℃ in the preparation stage of seed crystal. Meanwhile, the production was 20.97 g, the productivity was 8.99 g/h, the iron content in oxide was 86.95% when the concentration of seed crystal was 20%, pH value 4.5~ 5.0, initial ferrous sulfate amount 60 g in the preparation stage of iron oxide yellow. The prepared iron oxide yellow was homogeneous claviform particles with the phase composition of FeOOH, average diameter 860 nm, and specific surface area 21.98 m2/g, and its quality was over the first grade of industrial standard HG/T 2249-91.

Key words: titanium dioxide, ferrous sulfate, seed crystal, iron oxide yellow, pigment