JPS55167127A - Continuously converting method for anhydrous gypsum into gypsum - Google Patents

Continuously converting method for anhydrous gypsum into gypsum

Info

Publication number
JPS55167127A
JPS55167127A JP7451479A JP7451479A JPS55167127A JP S55167127 A JPS55167127 A JP S55167127A JP 7451479 A JP7451479 A JP 7451479A JP 7451479 A JP7451479 A JP 7451479A JP S55167127 A JPS55167127 A JP S55167127A
Authority
JP
Japan
Prior art keywords
gypsum
vessel
slurry
hydration
hydrated
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
JP7451479A
Other languages
Japanese (ja)
Other versions
JPS603007B2 (en
Inventor
Kisaku Furuya
Ichiro Terada
Takuya Watanabe
Akira Otsuka
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.)
YOSHINO SEKKO KK
Yoshino Gypsum Co Ltd
Original Assignee
YOSHINO SEKKO KK
Yoshino Gypsum 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 YOSHINO SEKKO KK, Yoshino Gypsum Co Ltd filed Critical YOSHINO SEKKO KK
Priority to JP7451479A priority Critical patent/JPS603007B2/en
Publication of JPS55167127A publication Critical patent/JPS55167127A/en
Publication of JPS603007B2 publication Critical patent/JPS603007B2/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C01F11/466—Conversion of one form of calcium sulfate to another

Abstract

PURPOSE: To obtain coarse gypsum crystals, which were difficult to obtain formerly, by maintaining a slurry of by-product anhydrous gypsum and an aqueous soln. of a specified hydration accelerator at a specified temp., agitating the slurry to hydrate it, pH-adjusting the hydrated slurry with a Ca compound, and separating gypsum.
CONSTITUTION: Slurry 5 of by-product anhydrous sypsum 4 of a hydrofluoric acid manufacturing process and an aqueous soln. of a hydration accelerator consisting of sodium sulfate or potassium sulfate 1 and sodium chloride 2 is passed through primary hydration vessel 6 and secondary hydration vessel 7, maintained at 30°C or below with refrigerator 8, and hydrated by agitation. Part of the hydrate is recycled to vessel 6 as seed crystals, and the remaining hydrated slurry is adjusted to pH 6.5W8 with quick lime or the like in vessel 10 and passed through vessel 11 and dehydrator 12 to separate gypsum 16. Soln. 14 and part of washing liq. 15 are recycled. Gypsum 16 thus obtd. is coarse crystals and can be utilized as starting material gypsum for gypsum plaster board, plaster, etc.
COPYRIGHT: (C)1980,JPO&Japio
JP7451479A 1979-06-13 1979-06-13 Method for continuously converting anhydrite to dihydrate Expired JPS603007B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7451479A JPS603007B2 (en) 1979-06-13 1979-06-13 Method for continuously converting anhydrite to dihydrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7451479A JPS603007B2 (en) 1979-06-13 1979-06-13 Method for continuously converting anhydrite to dihydrate

Publications (2)

Publication Number Publication Date
JPS55167127A true JPS55167127A (en) 1980-12-26
JPS603007B2 JPS603007B2 (en) 1985-01-25

Family

ID=13549509

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7451479A Expired JPS603007B2 (en) 1979-06-13 1979-06-13 Method for continuously converting anhydrite to dihydrate

Country Status (1)

Country Link
JP (1) JPS603007B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009040638A (en) * 2007-08-09 2009-02-26 Tokuyama Corp Manufacture method of gypsum dihydrate
JP2010013304A (en) * 2008-07-02 2010-01-21 Tokuyama Corp Method for regenerating gypsum from gypsum board waste material
CN109305791A (en) * 2018-10-31 2019-02-05 曲靖师范学院 A kind of hydration curing coagulant of β semi-hydrated gypsum phenolphthalein class acceleration
CN110589869A (en) * 2019-09-09 2019-12-20 湖北工业大学 Method for preparing alpha high-strength gypsum by using chlor-alkali byproduct salt gypsum and chemical waste salt in normal-pressure salt solution method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201272U (en) * 1985-06-05 1986-12-17

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009040638A (en) * 2007-08-09 2009-02-26 Tokuyama Corp Manufacture method of gypsum dihydrate
JP2010013304A (en) * 2008-07-02 2010-01-21 Tokuyama Corp Method for regenerating gypsum from gypsum board waste material
CN109305791A (en) * 2018-10-31 2019-02-05 曲靖师范学院 A kind of hydration curing coagulant of β semi-hydrated gypsum phenolphthalein class acceleration
CN110589869A (en) * 2019-09-09 2019-12-20 湖北工业大学 Method for preparing alpha high-strength gypsum by using chlor-alkali byproduct salt gypsum and chemical waste salt in normal-pressure salt solution method

Also Published As

Publication number Publication date
JPS603007B2 (en) 1985-01-25

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