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<p>When the total content of calcium oxide (CaO) and magnesium oxide (MgO) exceeds 1.5&#xa0;wt% in high-titanium slag, it leads to significant blockages in the chlorination furnace. As a result, the production of titanium dioxide (TiO<sub>2</sub>) through the chloride process is inhibited. To address this issue, a novel high-pressure oxidative leaching process has been proposed for removing Ca and Mg using high-Ca/Mg high-titanium slag as raw material. In this study, the oxidation efficiency of various oxidants on low-valent titanium present in the slag was investigated. Additionally, the effects of key process parameters, including hydrochloric acid concentration, leaching temperature, holding time, and liquid-to-solid ratio, on both TiO<sub>2</sub> direct yield and impurity removal efficiency were investigated. FeCl<sub>3</sub> was used as an oxidant at an Fe<sup>3+</sup> concentration of 25&#xa0;g/L. The optimal processing conditions were identified as follows: hydrochloric acid concentration of 240&#xa0;g/L, titanium slag particle size of 60–100 mesh, leaching temperature of 155&#xa0;°C, holding time of 4&#xa0;h, liquid-to-solid ratio of 3:1, stirring speed of 500&#xa0;rpm, and system pressure of 0.9&#xa0;MPa. Under these optimized conditions, a titanium-rich product with a TiO<sub>2</sub> content of 88.63 wt% and a CaO + MgO content below 1.50 wt% was successfully produced, meeting the stringent requirements for fluidized-bed chlorination processes. This study provides valuable technical support for effectively removing Ca and Mg from high-titanium slag while promoting the high-value utilization of titanium ore resources.</p> Graphical Abstract <p></p>

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One-Step Separation of Magnesium and Calcium from High-Titanium Slag by Pressurized Oxidation Acid Leaching

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Yapeng Liu,
  • Bo Zhao,
  • Gaofeng He,
  • Feng Liu,
  • Qinghai Liu,
  • Weiran Miao,
  • Tao Qu,
  • Bin Yang,
  • Dachun Liu,
  • Zhaowang Dong

摘要

When the total content of calcium oxide (CaO) and magnesium oxide (MgO) exceeds 1.5 wt% in high-titanium slag, it leads to significant blockages in the chlorination furnace. As a result, the production of titanium dioxide (TiO2) through the chloride process is inhibited. To address this issue, a novel high-pressure oxidative leaching process has been proposed for removing Ca and Mg using high-Ca/Mg high-titanium slag as raw material. In this study, the oxidation efficiency of various oxidants on low-valent titanium present in the slag was investigated. Additionally, the effects of key process parameters, including hydrochloric acid concentration, leaching temperature, holding time, and liquid-to-solid ratio, on both TiO2 direct yield and impurity removal efficiency were investigated. FeCl3 was used as an oxidant at an Fe3+ concentration of 25 g/L. The optimal processing conditions were identified as follows: hydrochloric acid concentration of 240 g/L, titanium slag particle size of 60–100 mesh, leaching temperature of 155 °C, holding time of 4 h, liquid-to-solid ratio of 3:1, stirring speed of 500 rpm, and system pressure of 0.9 MPa. Under these optimized conditions, a titanium-rich product with a TiO2 content of 88.63 wt% and a CaO + MgO content below 1.50 wt% was successfully produced, meeting the stringent requirements for fluidized-bed chlorination processes. This study provides valuable technical support for effectively removing Ca and Mg from high-titanium slag while promoting the high-value utilization of titanium ore resources.

Graphical Abstract