Formation of anatase precipitates containing Fe(III) by the air oxidation at 95.DEG.C of strongly acidic solutions.

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Strongly acidic titanium(II)) chloride solutions containing iron (II) sulfate were subjected to oxidation with air at 95 °C. The products consist of spheres, 0.5–1.0 μm in size, each composed of extremely fine particles, 100–150 Å in size. Fe(III) is incorporated up to about 6% of the total metal ions in the product, in spite of the strongly acidic solution. The products, containing H2O and SO42− besides Fe(III), are dehydrated in the temperature range 100–400 °C and the sulfate decomposition begins at about 750 °C in air. The SO42− in the products can be easily removed by washing at room temperature with NaOH solution. No marked differences can be detected in color, magnetic properties, or in growth of the extremely fine particles before and after the dehydration by heat treatment at 500 °C; a change in such physical properties begins to occur at 550 °C. It is concluded that the Fe(III) in the product is interposed between the extremely fine particles, whereas the H2O and SO42− are adsorbed in the spherical poly crystal line particles formed with oxo and hydroxo combination of the extremely fine particles.
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