Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

In this study, the preparation of cerium carbonate from cerium hydroxide resulted from cerium-containing solution was investigated through consideration of each stage, such as conversion materials and removal of impurities. When cerium sodium sulfate was synthesised by addition of sodium sulfate in the solution containing cerium fluoride anion, 2.5 equivalent of aluminum sulfate was added into the solution and reacted at 50℃ and 2 hours in order to prohibit the formation of cerium fluoride. When cerium chloride solution was prepared from cerium hydroxide, 1.0 equivalent of hydrochloric acid was added, and 1.5 equivalent of hydroperoxide was added in order to reduce Ce4+(ceric) and Ce3+(cerous). It was proper to maintain pH of solution 3～4 for removal of iron by acidity control method. Cerium carbonate with cerium carbonate hydrate crystal structure was prepared at the following conditions : concentration of cerium chloride 90 g/l, reaction temperature 75℃ and concentration of ammonium carbonate 0.5 M. added in cerium chloride solution.