Title:
【発明の名称】アンモニアの添加工程を用いた金属硫酸塩含有排水の処理及び高品質化方法
Document Type and Number:
Japanese Patent JP2003531006
Kind Code:
A
Abstract:
A method for treating and upgrading effluents containing at least a metallic sulphate comprising adding at least a base to the effluent to precipitate the metallic ions in the form of iron oxy-hydroxides Fe(OHx) wherein x=2 and/or 3; separating the precipitated hydroxide calcium sulphate CaSO4; and separating the calcium sulphate CaSO4 precipitated during the preceding step. Said method enables obtainment of calcium sulphate (white gypsum) substantially free of metals and therefore capable of being upgraded and iron oxy-hydroxides likewise capable of being upgraded.
Inventors:
Francois, Yvelar
Muret, Pascal
Muret, Pascal
Application Number:
JP2001578356A
Publication Date:
October 21, 2003
Filing Date:
April 17, 2001
Export Citation:
Assignee:
Sarp Andustri
International Classes:
C01F11/46; C01G49/02; C02F1/20; C02F1/52; C02F1/58; B01D19/00; C02F9/02; (IPC1-7): C02F1/58; B01D19/00; C01F11/46; C01G49/02; C02F1/20
Attorney, Agent or Firm:
Okuyama Shoichi (2 outside)