JPS54133475A - Treating method for exhaust liquid at gypsum manufacturing process - Google Patents

Treating method for exhaust liquid at gypsum manufacturing process

Info

Publication number
JPS54133475A
JPS54133475A JP4024578A JP4024578A JPS54133475A JP S54133475 A JPS54133475 A JP S54133475A JP 4024578 A JP4024578 A JP 4024578A JP 4024578 A JP4024578 A JP 4024578A JP S54133475 A JPS54133475 A JP S54133475A
Authority
JP
Japan
Prior art keywords
exhaust
liquid
exhaust liquid
gas
vessel
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
JP4024578A
Other languages
Japanese (ja)
Inventor
Isanobu Yoshida
Nobuaki Konishi
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP4024578A priority Critical patent/JPS54133475A/en
Publication of JPS54133475A publication Critical patent/JPS54133475A/en
Pending legal-status Critical Current

Links

Landscapes

  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Physical Water Treatments (AREA)

Abstract

PURPOSE: To prevent the cloudiness of neutralized exhaust water economically and effectively, by using the following liquid for neutralization of high pH surplus exhaust water produced at exhaust gas desulfurization process, after exposing acidic exhaust liquid of SO2 gas cooling and washing process in the air preliminary and collecting and removing SO2- 3 as SO2 gas and then, oxidizing a part of SO2- 3 to SO2- 4 in the liquid.
CONSTITUTION: Milk of lime is added to exhaust liquid produced in the process of gypsum manufacturing of exhaust gas desulfurization method at the exhaust water treating apparatus 1 and pH is made more than 9 and heavy metal in the exhaust liquid is precipitated and removed as hydroxide. The exhaust liquid having a high pH value, is sent to the recovering water vessel 2 and a part of it is reused. Then, remaining surplus exhaust water is sent to the neutralization vessel 3 and is dischargeed after neutralized by acidic exhaust liquid. The acidic exhaust liquid from the cooling and washing tower 4 of SO2 gas is exposed in the air for a constant time at the exposing vessel 5 and SO2- 3 in exhaust liquid is collected as SO2 gas and then, is rturned to SO2 absorbing process again and moreover, a part of it is oxidized to SO2- 4 in the exhaust liquid. The above exhaust liquid is sent to the vessel 3. Gypsum is produced by the above neutralization reaction, but cloudiness is not produced because the solubility of gypsum is far larger than that of CaSO3.
COPYRIGHT: (C)1979,JPO&Japio
JP4024578A 1978-04-07 1978-04-07 Treating method for exhaust liquid at gypsum manufacturing process Pending JPS54133475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4024578A JPS54133475A (en) 1978-04-07 1978-04-07 Treating method for exhaust liquid at gypsum manufacturing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4024578A JPS54133475A (en) 1978-04-07 1978-04-07 Treating method for exhaust liquid at gypsum manufacturing process

Publications (1)

Publication Number Publication Date
JPS54133475A true JPS54133475A (en) 1979-10-17

Family

ID=12575316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4024578A Pending JPS54133475A (en) 1978-04-07 1978-04-07 Treating method for exhaust liquid at gypsum manufacturing process

Country Status (1)

Country Link
JP (1) JPS54133475A (en)

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