Acidolysis Performance of Titania Slag Treated at Different Cooling Conditions
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RESEARCH ARTICLE
Acidolysis Performance of Titania Slag Treated at Different Cooling Conditions Bing Song1,2 · Guoliang Yin3 · Ping Huang4 · Mingchuan Shi5 · Yong Ma6
© The Minerals, Metals & Materials Society 2020
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)xTiyO5. 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
Keywords Cooling conditions · Titania slag · Rutile · Sulfuric acid acidolysis · Cooling time
Introduction
The contributing editor for this article was Hiromichi Takebe. * Guoliang Yin [email protected] Extended author information available on the last page of the article
High-grade Titania slag has become superior-quality raw materials for the rapid development of Titania chain industry. Titania slag is prepared by smelting ilmenite ore in an electric arc furnace [1, 2]. During the smelting process, the processed Titania slag can influence the quality of pigment such as chromaticity [3–8]. Panzhihua Titania slag has a good acid-soluble properties in sulfuric acid concentration under slow cooling
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Journal of Sustainable Metallurgy
conditions. Therefore, cooling parameters must be controlled to acquire high-quality Titania slag; it may affect the chemical composition or phases component of Titania slag and further affect acidolysis of Titania slag [9–11]. In the past decades, numerous studies have been reported on phases and structure of Titania slag [12–18]. However, phase change during cooling process is less studied. Lei [19, 20] reported the mineral compositions of Titania slag which consisted of anosovite solid solution, glass, and a small amount of uncombined T iO2. Xu [21] studied the influences of chemical additive proportion and roasting temperature on the phase composition of high Titania slag. The modified roasting produced high Titania slag with T iO2 and other impurities which gradually transformed into titanate calcium, and the t
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