Process for treating and recovering pickling waste liquids for stainless steel
Номер патента: CA1237644A
Опубликовано: 07-06-1988
Автор(ы): Kazuhiro Uchino, Minoru Hoshino, Noboru Ishihara, Toshio Watanabe, Yoshio Nakazato
Принадлежит: Kawasaki Steel Corp
Опубликовано: 07-06-1988
Автор(ы): Kazuhiro Uchino, Minoru Hoshino, Noboru Ishihara, Toshio Watanabe, Yoshio Nakazato
Принадлежит: Kawasaki Steel Corp
Реферат: Abstract of the Disclosure A process for treating and recovering pickling waste liquids used for the pickling of stainless steel such as nitric-hydrofluoric acid, nitric acid, hydro-chloric acid and, sulfuric acid is disclosed, which comprises recovering the nitric-hydrofluoric acid and the iron oxide or metallic ion from the waste liquids of nitric-hydrofluoric acid and nitric acid by two solvent extraction processes and recovering the Cr and Ni containing ferrite from the waste liquids of sulfuric acid or hydrochloric acid by a ferrite formation process. When the waste acid is sulfuric acid, gypsum of a high purity can be obtained.
Process for treating chromate waste liquid
Номер патента: US6846416B2. Автор: Hiroaki Nasu,Wataru Matsutani. Владелец: NGK Spark Plug Co Ltd. Дата публикации: 2005-01-25.