국내 산출 레드머드에서 스칸듐 회수를 위한 침출 거동 연구 = Investigation of Leaching Characteristics of Scandium from the Red-mud Produced in Korea

다국어 초록 (Multilingual Abstract)

In Korea, more than 200,000 tons of red-mud are produced annually during the aluminum hydroxide manufacturing process. The red-mud produced contains valuable resources, including scandium; however, most of the red-mud is not recycled, causing environmental problems. The aim of this study is to investigate the leaching characteristics of scandium from red-mud produced in Korea. Leaching experiments on domestic red-mud were conducted under varying leaching times, leaching temperatures, liquid-to-solid (L/S) ratios, and acid concentrations. The recovery of scandium was higher when leached in H₂SO₄ solution compared to HCl solution. Whereas the dissolution of scandium was slightly affected by leaching time and temperature, changes in acid concentrations and liquid-to-solid ratios significantly enhanced the dissolution of scandium by approximately 40%. In 5 M acid solution and an L/S ratio of 10, the maximum dissolution efficiency of scandium was measured to be approximately 89%. The leaching data indicated that scandium dissolution was closely associated with acid concentrations and L/S ratios. This study investigated leaching process characteristics as a pre-treatment process to recover scandium from red-mud scrap. These results could have industrial applications through scaling up.

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