| 摘要 |
PROBLEM TO BE SOLVED: To provide an easy method for refining magnesium simultaneously solving the problems that, in generally circulating lime nitrogen, only about 40 to 55% of calcium cyanamide contributing a reduction of magnesium is included, and a use of the lime nitrogen as it is with heat added for magnesium refining causes a large energy loss, further, in the case of magnesium being refined by reducing bitten, seawater or the thermally dehydrated product thereof, a risk of generating hydrogen chloride to remarkably damage a furnace occurs, and in which production is suppressed.SOLUTION: Lime nitrogen is poured into water or a solution including water to dissolve lime in the lime nitrogen, and further, calcium cyanamide is precipitated and recovered to obtain calcium cyanamide with high purity. Further, the dissolved lime and magnesium chloride in an aqueous solution are reacted to precipitate and recover magnesium hydroxide, and they are mixed and heated to refine magnesium. |
