JPS5490098A - Method of producing fibrous gypsum - Google Patents

Method of producing fibrous gypsum

Info

Publication number
JPS5490098A
JPS5490098A JP15745377A JP15745377A JPS5490098A JP S5490098 A JPS5490098 A JP S5490098A JP 15745377 A JP15745377 A JP 15745377A JP 15745377 A JP15745377 A JP 15745377A JP S5490098 A JPS5490098 A JP S5490098A
Authority
JP
Japan
Prior art keywords
acid
caso
gypsum
fibrous
hours
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
JP15745377A
Other languages
Japanese (ja)
Other versions
JPS6224362B2 (en
Inventor
Masahiko Shiraishi
Hiroshi Nishitani
Toshiyuki Taku
Shiro Kozakura
Chikao Shiura
Shingo Isshiki
Katsumi Uchiyama
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.)
Idemitsu Kosan Co Ltd
Original Assignee
Idemitsu Kosan 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 Idemitsu Kosan Co Ltd filed Critical Idemitsu Kosan Co Ltd
Priority to JP15745377A priority Critical patent/JPS5490098A/en
Publication of JPS5490098A publication Critical patent/JPS5490098A/en
Publication of JPS6224362B2 publication Critical patent/JPS6224362B2/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)
  • Inorganic Fibers (AREA)

Abstract

PURPOSE: To accomplish an efficient, economic production of a fibrous gypsum of good quality by bringing CaSO4 into hydrothermal reaction in a solution containing an acid below a specified concentration under a pressure within a specified range of temperature.
CONSTITUTION: The material for the gypsum employes ordinary CaSO4, mainly composed of bihydrate. The CaSO4 may contain a small amount of α-hemihydrate or III-anhydrate. This CaSO4 is added to a acidic solution with an acid component of less than 15% by weight at a ratio of 0.5 to 30 parts by weight to 100 parts. For the acid applicable is either of an organic acid such as formic acid and acetic acid or an inorganic acid such as phosphoric acid, hydrochloric acid, nitric acid and sulfuric acid. The acidic solution thus mixed with CaSO4 is brought into hydrothermal reaction at 105 to 170°C under a pressure of 1 to 7 kg/cm2 to produce a fibrous α-hemihydrous gypsum with a large value of L/D (L; length, D; diameter). The product thus obtained is allowed to dry at 60°C for about 24 hours and sintered at 500 to 800°C for about 3 hours to be converted to a fibrous II-anhydrous gypsum.
COPYRIGHT: (C)1979,JPO&Japio
JP15745377A 1977-12-28 1977-12-28 Method of producing fibrous gypsum Granted JPS5490098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15745377A JPS5490098A (en) 1977-12-28 1977-12-28 Method of producing fibrous gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15745377A JPS5490098A (en) 1977-12-28 1977-12-28 Method of producing fibrous gypsum

Publications (2)

Publication Number Publication Date
JPS5490098A true JPS5490098A (en) 1979-07-17
JPS6224362B2 JPS6224362B2 (en) 1987-05-28

Family

ID=15649979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15745377A Granted JPS5490098A (en) 1977-12-28 1977-12-28 Method of producing fibrous gypsum

Country Status (1)

Country Link
JP (1) JPS5490098A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5376351A (en) * 1992-07-01 1994-12-27 Tioxide Group Services Limited Process for preparing calcium sulphate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5376351A (en) * 1992-07-01 1994-12-27 Tioxide Group Services Limited Process for preparing calcium sulphate

Also Published As

Publication number Publication date
JPS6224362B2 (en) 1987-05-28

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