| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing sodium carbonate by Solvay process by using a low-grade limestone which has a high content of impurities, inhomogeneous sizes, and especially a high content of minute particles. SOLUTION: In a carbonation process of the method for producing sodium carbonate by Solvay process, a carbon dioxide gas is used. The carbon dioxide gas is obtained through a process for supplying limestone 1 to a rotary kiln 2 to pyrolyze it and for recovering a waste gas including a formed carbon dioxide gas and a concentrating process for concentrating the waste gas recovered from the rotary kiln so that the concentration of the carbon dioxide gas becomes 40 vol.% or more. COPYRIGHT: (C)2011,JPO&INPIT
|
