| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low cost production method for a high purity calcium salt solution suitably used for the production of high purity calcium carbonate, and to provide a production method for high purity calcium carbonate using the high purity calcium salt solution. <P>SOLUTION: The production method for a high purity calcium salt solution includes following processes 1 to 4. The process 1 comprises preparing a solution containing Ca in concentration of 0.5-20 wt.% by dissolving limestone in hydrochloric acid, and then removing insoluble content by filtration. The process 2 comprises adjusting the pH of a filtrate obtained in the process 1 to 10 or higher and removing insoluble content by filtration. The process 3 comprises adjusting the pH of a filtrate obtained in the process 2 to 5-7 and removing insoluble content by filtration. The process 4 comprises subjecting the filtrate obtained in the process 3 to a chelating treatment using an amino acid-based chelating resin. The method for producing high purity calcium carbonate comprises subjecting the high purity calcium salt solution to carbonation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
