JPS57207130A - Recovering method for valuable material from low ph process liquid of surface treatment for metal - Google Patents

Recovering method for valuable material from low ph process liquid of surface treatment for metal

Info

Publication number
JPS57207130A
JPS57207130A JP9074381A JP9074381A JPS57207130A JP S57207130 A JPS57207130 A JP S57207130A JP 9074381 A JP9074381 A JP 9074381A JP 9074381 A JP9074381 A JP 9074381A JP S57207130 A JPS57207130 A JP S57207130A
Authority
JP
Japan
Prior art keywords
tank
liquid
surface treatment
treating
process liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9074381A
Other languages
Japanese (ja)
Other versions
JPH0122360B2 (en
Inventor
Setsu Watanabe
Koki Tamura
Kazumi Iwata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teijin Ltd
Original Assignee
Teijin Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teijin Ltd filed Critical Teijin Ltd
Priority to JP9074381A priority Critical patent/JPS57207130A/en
Publication of JPS57207130A publication Critical patent/JPS57207130A/en
Publication of JPH0122360B2 publication Critical patent/JPH0122360B2/ja
Granted legal-status Critical Current

Links

Classifications

    • Y02W30/54—

Abstract

PURPOSE: To concentrate process liquid of ≤1pH of surface treatments for metals at a small energy cost without any special neutralization by treating said liquid with a polybenzimidazolone selective permeable membrane.
CONSTITUTION: The above-described process liquid is subjected to a reverse osmosis treatment without neutralization with a polybenzimidazolone selective permeable membrane which has benzimidazolone rings and of which the selective permeability occurs mainly in the presence of said rings. For example, an object (a) to be treated which is carried into a bath tank A for surface treatment of metals through a pretreatment stage receives a surface treatment by treating liquid in said tank, after which it is immersed in a recovering tank B and is removed of the treating liquid stuck thereof; further, it is rinsed in rinsing tanks C, D. In this system, the recovering liquid is returned from the tank B into the tank A. At the same time, the treating liquid is partly removed from the tank A, and is concd. to about 1.1W1.5 times under about 20W70kg/ cm2 pressures in a reverse osmosis device E. The concd. liquid is returned to the tank A, whereby the concn. of the tank A is maintained constant. The permeated liquid separated by the reverse oscmosis is fed to the tank B where it is reused as rinsing water for the object to be treated.
COPYRIGHT: (C)1982,JPO&Japio
JP9074381A 1981-06-15 1981-06-15 Recovering method for valuable material from low ph process liquid of surface treatment for metal Granted JPS57207130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9074381A JPS57207130A (en) 1981-06-15 1981-06-15 Recovering method for valuable material from low ph process liquid of surface treatment for metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9074381A JPS57207130A (en) 1981-06-15 1981-06-15 Recovering method for valuable material from low ph process liquid of surface treatment for metal

Publications (2)

Publication Number Publication Date
JPS57207130A true JPS57207130A (en) 1982-12-18
JPH0122360B2 JPH0122360B2 (en) 1989-04-26

Family

ID=14007058

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9074381A Granted JPS57207130A (en) 1981-06-15 1981-06-15 Recovering method for valuable material from low ph process liquid of surface treatment for metal

Country Status (1)

Country Link
JP (1) JPS57207130A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1549420A4 (en) * 2002-05-06 2006-03-29 Debasish Mukhopadhyay Method and apparatus for fluid treatment by reverse osmosis under acidic conditions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7320756B2 (en) 2001-05-05 2008-01-22 Debasish Mukhopadhyay Method and apparatus for treatment of feedwaters by membrane separation under acidic conditions
EP1549420A4 (en) * 2002-05-06 2006-03-29 Debasish Mukhopadhyay Method and apparatus for fluid treatment by reverse osmosis under acidic conditions

Also Published As

Publication number Publication date
JPH0122360B2 (en) 1989-04-26

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