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PROCESS FOR THE PREPARATION OF PIGMENT GRADE IRON OXIDES FROM FERROUS SULPHATE AND THE RESULTING FE2O3 PIGMENTS
PROCESS FOR THE PREPARATION OF PIGMENT GRADE IRON OXIDES FROM FERROUS SULPHATE AND THE RESULTING FE2O3 PIGMENTS
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机译:用硫酸铁制备颜料级氧化铁的方法及所产生的Fe2O3
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摘要
Pigment grade Fe2O3 is prepared from ferrous sulphate by a roasting process. The ferrous sulphate, partly dehydrated and granulated, is partially converted to the oxide by roasting. After elimination of soluble constituents by washing with water, the oxide is subjected to pigmentary calcination and then crushed and optionally micronized. This process makes it possible to prepare red pigments of excellent quality characterized particularly by pure tints ranging from orange-red to purplish-red. The oil absorptions are especially low. Low toxic impurity concentrations permit the use of these pigments in foodstuffs.
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