PRODUCTION OF LOW-NITROGEN POLYFERRIC SULFATE SOLUTION

Title:

PRODUCTION OF LOW-NITROGEN POLYFERRIC SULFATE SOLUTION

Document Type and Number:

Japanese Patent JP3532074

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide the method for producing a polyiron sulfate soln. by oxidation using nitrogen oxides as an inexpensive oxidizing agent by which the nitrogen content in the product is made extremely low.
SOLUTION: A polyferric sulfate soln. is produced by an iron sulfate soln. having a specified content of iron salt and with the molar ratio of the iron content in the iron salt to sulfuric acid controlled to 1-1.5 by oxidizing the iron(II) to iron(III) with air or oxygen with the nitrogen oxides such as sodium nitrite as a catalyst. Subsequently, a ferrous salt or metallic iron is added as a reducing agent in small amts. to the nitrogen component contained to remove the nitrogen component as NOx. The addition in small amts. is repeated to produce a low-nitrogen polyferric sulfate soln.

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Inventors:

Morita, Hiroya
Matsuzaki, Naosuke
Yamada, Keita
Kudo, Mitsuhiko
Sakuma, Yukio

Application Number:

JP19276797A

Publication Date:

May 31, 2004

Filing Date:

July 17, 1997

Export Citation:

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Assignee:

NITTETSU MINING CO LTD
ASAKA RIKEN KOGYO KK

International Classes:

B01D21/01; C01G49/14; C02F1/52; (IPC1-7): C01G49/14; B01D21/01; C02F1/52

Attorney, Agent or Firm:

藤田アキラ

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