Title:
WET TREATMENT OF PETROLEUM COMBUSTION ASH
Document Type and Number:
Japanese Patent JP3686491
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the generation of the clogging caused by the sedimentation of magnesium hydroxide in a recovery apparatus when free ammonia is recovered from a slurry containing gypsum and free ammonia in a wet treatment process of petroleum combustion ash containing ammonium sulfate and magnesium.
SOLUTION: In a wet process successively including at least a slurry preparing process preparing a slurry containing ammonium sulfate and magnesium ions by mixing combustion ash and water, a double-decomposition process of ammonium sulfate, a process recovering free ammonia from the slurry containing gypsum and free ammonia formed in the double-decomposition process and a gypsum separation process, magnesium is converted to magnesium carbonate by carbon dioxide or carbon dioxide-containing gas after the slurry preparing process but before the ammonia recovery process.
Inventors:
Toshiaki Akahoshi
Akira Sakuma
Masutaka Fujishiro
Akira Sakuma
Masutaka Fujishiro
Application Number:
JP35455396A
Publication Date:
August 24, 2005
Filing Date:
December 19, 1996
Export Citation:
Assignee:
Kashima Kita Joint Power Generation Co., Ltd.
International Classes:
C01C1/02; B09B3/00; (IPC1-7): B09B3/00; C01C1/02
Domestic Patent References:
| JP4061709B2 | ||||
| JP50103164A | ||||
| JP513718B2 | ||||
| JP5354862A | ||||
| JP50115192A |
Attorney, Agent or Firm:
Kazuhiko Okada