Abstract
The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.
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