Abstract

The effect of cooling methods such as granulating, water cooling, and air cooling on the quality of Titania slag was investigated. The results show that the Ti₂O₃ content in Titania slag is decreased with three different cooling ways. For instance, Ti₂O₃ content in granulated slag decreased by 27.6%. Content of Fe₂O₃ in granulated slag was approximately 2.86% higher than both water-cooled slag and air-cooled slag. The main phases in the cooled slag consisted of TiO₂ and (Fe, Mg)_xTi_yO₅. Rutile phase in both water-cooled slag and air-cooled slag is not found; however, it is detected in the granulated slag. The acidolysis ratio was measured to be 90.61% and 92.46% in water-cooled slag and air-cooled slag, respectively. However, the acidolysis ratio of granulated slag was only 74.72% that is 20% less than that of original industry slag. It is found that the acidolysis ratio was dependent on the phases, composition of Titania slag, and cooling conditions. Rutile could reduce acidolysis ratio of Titania slag, and therefore, it should be controlled as low as possible. Prolonging the cooling time can increase acidolysis ratio of slag, and the optimum cooling time for this study is found to be about 18 h.

Graphical Abstract

中文翻译：

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不同冷却条件下二氧化钛渣的酸解性能

摘要

研究了制粒，水冷和空冷等冷却方法对二氧化钛炉渣质量的影响。结果表明，采用三种不同的冷却方式降低了二氧化钛渣中Ti ₂ O _3的含量。例如，矿渣中的Ti ₂ O ₃含量降低了27.6％。粒状炉渣中的Fe ₂ O ₃含量比水冷炉渣和风冷炉渣均高约2.86％。冷却炉渣中的主要相由TiO ₂和（Fe，Mg）_x Ti _y O _5组成。在水冷炉渣和空冷炉渣中均未发现金红石相。但是，在粒状炉渣中被检测到。在水冷炉渣和空冷炉渣中测得的酸解率分别为90.61％和92.46％。然而，颗粒渣的酸解率仅为74.72％，比原工业渣的酸解率低20％。发现酸解比取决于相，二氧化钛渣的组成和冷却条件。金红石可以降低二氧化钛渣的酸解率，因此应控制在尽可能低的水平。延长冷却时间可以提高炉渣的酸解率，本研究的最佳冷却时间约为18 h。

图形概要