JPS5542260A - Production of alpha-type hemihydrate gypsum from gypsum - Google Patents

Production of alpha-type hemihydrate gypsum from gypsum

Info

Publication number
JPS5542260A
JPS5542260A JP11550378A JP11550378A JPS5542260A JP S5542260 A JPS5542260 A JP S5542260A JP 11550378 A JP11550378 A JP 11550378A JP 11550378 A JP11550378 A JP 11550378A JP S5542260 A JPS5542260 A JP S5542260A
Authority
JP
Japan
Prior art keywords
gypsum
sulfuric acid
type hemihydrate
production
fluorine ion
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
JP11550378A
Other languages
Japanese (ja)
Other versions
JPS5754449B2 (en
Inventor
Shuichi Hamazaki
Hiroshi Matsubayashi
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.)
Fuji Chitan Kogyo Kk
Fuji Titanium Industry Co Ltd
Original Assignee
Fuji Chitan Kogyo Kk
Fuji Titanium Industry 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 Fuji Chitan Kogyo Kk, Fuji Titanium Industry Co Ltd filed Critical Fuji Chitan Kogyo Kk
Priority to JP11550378A priority Critical patent/JPS5542260A/en
Publication of JPS5542260A publication Critical patent/JPS5542260A/en
Publication of JPS5754449B2 publication Critical patent/JPS5754449B2/ja
Granted 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

PURPOSE: To obtain high purity α-type hemihydrate gypsum with a favorable crystal from gypsum having a little value in use in an industrially advantageous manner by suspending gypsum in sulfuric acid formed in production of titanium oxide and by heat agitating the suspension in the presence of fluorine ion.
CONSTITUTION: Gypsum is suspended in waste sulfuric acid contg. inorg. impurities as well as above 130g/l of sulfuric acid formed in production of titanium oxide. The suspension is then agitated at 80°CWthe b.p. under ordinary press. in the presence of 0.1W3.0, pref. 0.3W1.0% fluorine ion to the waste acid, thus producing α-type hemihydrate gypsum. Since a fluorine ion supply substance must be added before the gyspum begins to be converted into α-type hemihydrate gypsum, it is desirable to previously add the substance to the waste sulfuric acid to be supplied to a reactor.
COPYRIGHT: (C)1980,JPO&Japio
JP11550378A 1978-09-19 1978-09-19 Production of alpha-type hemihydrate gypsum from gypsum Granted JPS5542260A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11550378A JPS5542260A (en) 1978-09-19 1978-09-19 Production of alpha-type hemihydrate gypsum from gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11550378A JPS5542260A (en) 1978-09-19 1978-09-19 Production of alpha-type hemihydrate gypsum from gypsum

Publications (2)

Publication Number Publication Date
JPS5542260A true JPS5542260A (en) 1980-03-25
JPS5754449B2 JPS5754449B2 (en) 1982-11-18

Family

ID=14664122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11550378A Granted JPS5542260A (en) 1978-09-19 1978-09-19 Production of alpha-type hemihydrate gypsum from gypsum

Country Status (1)

Country Link
JP (1) JPS5542260A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04265454A (en) * 1990-11-06 1992-09-21 Carl Freudenberg:Fa Device for quantitatively feeding combustion gas to combustion chamber for internal combustion engine
CN106590065A (en) * 2017-01-17 2017-04-26 荆门市磊鑫石膏制品有限公司 Preparation method for composite titanium dioxide powder
CN111116069A (en) * 2019-12-26 2020-05-08 安徽迪诺环保新材料科技有限公司 Fabricated building wall, titanium gypsum used by fabricated building wall and preparation method of titanium gypsum

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04265454A (en) * 1990-11-06 1992-09-21 Carl Freudenberg:Fa Device for quantitatively feeding combustion gas to combustion chamber for internal combustion engine
CN106590065A (en) * 2017-01-17 2017-04-26 荆门市磊鑫石膏制品有限公司 Preparation method for composite titanium dioxide powder
CN111116069A (en) * 2019-12-26 2020-05-08 安徽迪诺环保新材料科技有限公司 Fabricated building wall, titanium gypsum used by fabricated building wall and preparation method of titanium gypsum
CN111116069B (en) * 2019-12-26 2022-02-01 安徽迪诺环保新材料科技有限公司 Fabricated building wall, titanium gypsum used by fabricated building wall and preparation method of titanium gypsum

Also Published As

Publication number Publication date
JPS5754449B2 (en) 1982-11-18

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