JPS5673625A - Manufacture of alpha-type hemihydrate gypsum - Google Patents

Manufacture of alpha-type hemihydrate gypsum

Info

Publication number
JPS5673625A
JPS5673625A JP14774379A JP14774379A JPS5673625A JP S5673625 A JPS5673625 A JP S5673625A JP 14774379 A JP14774379 A JP 14774379A JP 14774379 A JP14774379 A JP 14774379A JP S5673625 A JPS5673625 A JP S5673625A
Authority
JP
Japan
Prior art keywords
gypsum
alpha
manufacture
type hemihydrate
hemihydrate gypsum
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
JP14774379A
Other languages
Japanese (ja)
Other versions
JPS6213286B2 (en
Inventor
Hiroyuki Matsumura
Tatsusaburo Nakamura
Taisuke Shibata
Yasuo Nozaki
Kenji Kamei
Satoshi Akiyama
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.)
Kawasaki Heavy Industries Ltd
Original Assignee
Kawasaki Heavy Industries 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 Kawasaki Heavy Industries Ltd filed Critical Kawasaki Heavy Industries Ltd
Priority to JP14774379A priority Critical patent/JPS5673625A/en
Publication of JPS5673625A publication Critical patent/JPS5673625A/en
Publication of JPS6213286B2 publication Critical patent/JPS6213286B2/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
    • 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 lower the Mg content of natural or chemical gypsum powder and prevent the occurrence of efflorescence by treating the powder with MgSO4 of a specified concn. in hot water of a specified pH at a specified temp.
CONSTITUTION: Natural or chemical gypsum fine powder is heat-treated in hot water of 2W5.5pH contg. 1W10wt% MgSO4 at 110W150°C to obtain α-type hemihydrate gypsum. The resulting gypsum is washed with warm water of about 95W 100°C.
COPYRIGHT: (C)1981,JPO&Japio
JP14774379A 1979-11-16 1979-11-16 Manufacture of alpha-type hemihydrate gypsum Granted JPS5673625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14774379A JPS5673625A (en) 1979-11-16 1979-11-16 Manufacture of alpha-type hemihydrate gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14774379A JPS5673625A (en) 1979-11-16 1979-11-16 Manufacture of alpha-type hemihydrate gypsum

Publications (2)

Publication Number Publication Date
JPS5673625A true JPS5673625A (en) 1981-06-18
JPS6213286B2 JPS6213286B2 (en) 1987-03-25

Family

ID=15437132

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14774379A Granted JPS5673625A (en) 1979-11-16 1979-11-16 Manufacture of alpha-type hemihydrate gypsum

Country Status (1)

Country Link
JP (1) JPS5673625A (en)

Also Published As

Publication number Publication date
JPS6213286B2 (en) 1987-03-25

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