Abstract: In the treating of waste slags produced in the desulfurization and/or dephosphorization of molten pig iron with alkali carbonates, the alkali is recovered by extracting said waste slags with hot water while feeding carbon dioxide gas to form an extraction solution having a pH of 9.0-11.5 and recovering alkali carbonates from said extraction solution. The extraction solution contains little sulphur and silicates, from which alkali carbonates can be easily recovered with high yield therefrom.
Type:
Grant
Filed:
January 25, 1979
Date of Patent:
September 30, 1980
Assignees:
Tokuyama Soda Company Limited, Sumitomo Metal Industries Limited
Inventors:
Katsukiyo Marukawa, Setsuo Okamoto, Kazunari Yamada, Masahisa Iba