JPS553314A - Production of fibrous gypsum - Google Patents

Production of fibrous gypsum

Info

Publication number
JPS553314A
JPS553314A JP7273678A JP7273678A JPS553314A JP S553314 A JPS553314 A JP S553314A JP 7273678 A JP7273678 A JP 7273678A JP 7273678 A JP7273678 A JP 7273678A JP S553314 A JPS553314 A JP S553314A
Authority
JP
Japan
Prior art keywords
gypsum
solvent
flask
raw material
amt
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
JP7273678A
Other languages
Japanese (ja)
Inventor
Susumu Shiraki
Chikao Shiho
Toshiyuki Taku
Mitsuo Hashimoto
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 JP7273678A priority Critical patent/JPS553314A/en
Publication of JPS553314A publication Critical patent/JPS553314A/en
Pending 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
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

PURPOSE: To obtain the title gypsum of a desired crystal shape by seperating a process for dissolving raw material gypsum such as gypsum, hemihydrate gypsum or an hydous gypsum and a process for precipitating α-type hemihydrate gypsum and by controlling the amt. of the raw material gypsum dissolved in a soln. to be introduced into the precipitation process.
CONSTITUTION: A solvent in flask 3 is evaporated, and the vapor is liquefied by cooling in condenser 2, drops onto raw material gypsum 4, and stays in extraction tube 1 to slowly dissolve gypsum 4. Next the solvent returns into flask 3 through bypass pipe 6. By repeating such solvent reflux the amt. of gypsum 4 dissolved in the solvent in flask 3 gradually increases to accelerate hydrothermal reaction. The gypsum begins to precipitate as α-type hemihydrate fibrous gypsum through a supersaturation state. By controlling the supersaturation degree according to the kind of the solvent, etc. the shape of fibrous crystals of the resulting α-type hemihydrate gypsum is selected arbitrarily. This product is utilized as a reinforcing filler, a noncombustible material (board), a heat insulating material, etc.
COPYRIGHT: (C)1980,JPO&Japio
JP7273678A 1978-06-17 1978-06-17 Production of fibrous gypsum Pending JPS553314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7273678A JPS553314A (en) 1978-06-17 1978-06-17 Production of fibrous gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7273678A JPS553314A (en) 1978-06-17 1978-06-17 Production of fibrous gypsum

Publications (1)

Publication Number Publication Date
JPS553314A true JPS553314A (en) 1980-01-11

Family

ID=13497933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7273678A Pending JPS553314A (en) 1978-06-17 1978-06-17 Production of fibrous gypsum

Country Status (1)

Country Link
JP (1) JPS553314A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6465016A (en) * 1987-05-22 1989-03-10 Rhein Westfael Elect Werk Ag Manufacture of calcium sulfide-alpha-hemihydrate from fine powder calcium sulfide dihydrate
US5106600A (en) * 1987-01-16 1992-04-21 United States Gypsum Company Process for producing tabular acicular gypsum crystals
US5173284A (en) * 1989-05-23 1992-12-22 Lafarge Coppee Process for preparation of purified calcium sulfate in an aqueous medium
CN104674333A (en) * 2015-03-17 2015-06-03 四川明鑫佳杰新材料有限责任公司 Method for preparing nano-grade calcium sulfate crystal whisker from anhydrite

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5106600A (en) * 1987-01-16 1992-04-21 United States Gypsum Company Process for producing tabular acicular gypsum crystals
JPS6465016A (en) * 1987-05-22 1989-03-10 Rhein Westfael Elect Werk Ag Manufacture of calcium sulfide-alpha-hemihydrate from fine powder calcium sulfide dihydrate
US5173284A (en) * 1989-05-23 1992-12-22 Lafarge Coppee Process for preparation of purified calcium sulfate in an aqueous medium
CN104674333A (en) * 2015-03-17 2015-06-03 四川明鑫佳杰新材料有限责任公司 Method for preparing nano-grade calcium sulfate crystal whisker from anhydrite

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