JPS57162692A - Treatment of aqueous solution containing borofluoride ion - Google Patents

Treatment of aqueous solution containing borofluoride ion

Info

Publication number
JPS57162692A
JPS57162692A JP4870481A JP4870481A JPS57162692A JP S57162692 A JPS57162692 A JP S57162692A JP 4870481 A JP4870481 A JP 4870481A JP 4870481 A JP4870481 A JP 4870481A JP S57162692 A JPS57162692 A JP S57162692A
Authority
JP
Japan
Prior art keywords
tank
treatment
kbf
soln
reverse osmosis
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.)
Pending
Application number
JP4870481A
Other languages
Japanese (ja)
Inventor
Shinji Ishii
Hiroshi Iwabori
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.)
Nitto Denko Corp
Original Assignee
Nitto Electric Industrial Co 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 Nitto Electric Industrial Co Ltd filed Critical Nitto Electric Industrial Co Ltd
Priority to JP4870481A priority Critical patent/JPS57162692A/en
Publication of JPS57162692A publication Critical patent/JPS57162692A/en
Pending legal-status Critical Current

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  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

PURPOSE: To reduce the production of sludge considerably by controlling the pH of an aq. soln. contg. borofluoride ions with potassium hydroxide and subjecting the same to a reverse osmosis treatment.
CONSTITUTION: For example, in a treatment of waste liquid of a borofluoride plating both, the waste plating soln. contg. BF4 - (about 2W2.7pH) of an Sn-Pb alloy plating bath is introduced into a pH controlling tank 1. Here, an aq. KOH soln. is added, by which pH of the waste liquid is controlled to ≥4.0. At this time, Sn++, Pb++ settle as hydroxide and BF4 - converts to KBF4 and part thereof settles when it attains a satd. state. The supernatant in the tank is transferred into a storage tank 2, after which it is treated in a reverse osmosis device 3. The resultant permeated water is discharged to the outside of the system and the concd. liquid is returned to the tank 2. If such operation is carried out continuously, the KBF4 in the tank 2 increases its concn. until it attains a satd. state, when it crystallizes and settles. The reason for using KOH lies in that it has low solubility in water of KBF4 and that it is possible to execute the reverse osmosis treatment in that low concn. state with eventually high treatment efficiency.
COPYRIGHT: (C)1982,JPO&Japio
JP4870481A 1981-03-31 1981-03-31 Treatment of aqueous solution containing borofluoride ion Pending JPS57162692A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4870481A JPS57162692A (en) 1981-03-31 1981-03-31 Treatment of aqueous solution containing borofluoride ion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4870481A JPS57162692A (en) 1981-03-31 1981-03-31 Treatment of aqueous solution containing borofluoride ion

Publications (1)

Publication Number Publication Date
JPS57162692A true JPS57162692A (en) 1982-10-06

Family

ID=12810694

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4870481A Pending JPS57162692A (en) 1981-03-31 1981-03-31 Treatment of aqueous solution containing borofluoride ion

Country Status (1)

Country Link
JP (1) JPS57162692A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51107663A (en) * 1975-03-19 1976-09-24 Mitsui Petrochemical Ind FURUOROHOSANIONO FUKUMUHAISUINO SHORIHOHO
JPS5396260A (en) * 1977-02-02 1978-08-23 Morita Kagaku Kogyo Method of treating waste water containing boron fluoride

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51107663A (en) * 1975-03-19 1976-09-24 Mitsui Petrochemical Ind FURUOROHOSANIONO FUKUMUHAISUINO SHORIHOHO
JPS5396260A (en) * 1977-02-02 1978-08-23 Morita Kagaku Kogyo Method of treating waste water containing boron fluoride

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