GB825735A - Process for the production of neutral synthetic anhydrite - Google Patents

Process for the production of neutral synthetic anhydrite

Info

Publication number
GB825735A
GB825735A GB36323/57A GB3632357A GB825735A GB 825735 A GB825735 A GB 825735A GB 36323/57 A GB36323/57 A GB 36323/57A GB 3632357 A GB3632357 A GB 3632357A GB 825735 A GB825735 A GB 825735A
Authority
GB
United Kingdom
Prior art keywords
anhydrite
neutral
sulphuric acid
production
ground
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.)
Expired
Application number
GB36323/57A
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.)
HINRICH REIMERS GmbH
Original Assignee
HINRICH REIMERS GmbH
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 HINRICH REIMERS GmbH filed Critical HINRICH REIMERS GmbH
Publication of GB825735A publication Critical patent/GB825735A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
    • C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/05—Calcium sulfate cements obtaining anhydrite, e.g. Keene's cement

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Epoxy Compounds (AREA)

Abstract

Neutral synthetic anhydrite is obtained from calcium sulphate contaminated with sulphuric acid, a by-product in the continuous production of hydrofluoric acid from calcium fluoride and sulphuric acid, by neutralizing the sulphuric acid with a basic calcium compound in the absence of moisture at a temperature between 100 DEG C. and 150 DEG C. The basic calcium compound may be the oxide, hydroxide or carbonate. The reaction mixture may be ground to a particle size not greater than 2 mm., and the neutral anhydrite may be ground to 170 mesh (U.S. standard screen). Before storing, the neutral anhydrite should be cooled to below 100 DEG C.
GB36323/57A 1956-11-21 1957-11-21 Process for the production of neutral synthetic anhydrite Expired GB825735A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE825735X 1956-11-21

Publications (1)

Publication Number Publication Date
GB825735A true GB825735A (en) 1959-12-23

Family

ID=6747608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36323/57A Expired GB825735A (en) 1956-11-21 1957-11-21 Process for the production of neutral synthetic anhydrite

Country Status (1)

Country Link
GB (1) GB825735A (en)

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