GB477743A - Improvements in hydraulic gypsum cement material and process of manufacturing the same - Google Patents

Improvements in hydraulic gypsum cement material and process of manufacturing the same

Info

Publication number
GB477743A
GB477743A GB9012/37A GB901237A GB477743A GB 477743 A GB477743 A GB 477743A GB 9012/37 A GB9012/37 A GB 9012/37A GB 901237 A GB901237 A GB 901237A GB 477743 A GB477743 A GB 477743A
Authority
GB
United Kingdom
Prior art keywords
per cent
phosphate
gypsum
sodium
mono
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
GB9012/37A
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.)
RUMFORD CHEMICAL WORKS
Original Assignee
RUMFORD CHEMICAL WORKS
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 RUMFORD CHEMICAL WORKS filed Critical RUMFORD CHEMICAL WORKS
Publication of GB477743A publication Critical patent/GB477743A/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
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Catalysts (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Hydraulic gypsum cement is made by calcining, at a temperature of at least 1800 DEG F., and preferably at 1800-2300 DEG F., an intimate mixture of a phosphoric acid, an alkali phosphate, and natural or artificial gypsum in a hydrated, partially hydrated or dehydrated state. Preferably silica or a silicate is also included. Examples of suitable alkaline phosphates are mono-calcium ortho phosphate and a sodium phosphate, e.g. mono-sodium ortho phosphate or sodium metaphosphate. The amount of the ingredients added to the gypsum need not exceed 1 per cent of phosphoric acid, ,5 per cent of alkaline phosphate and 3 per cent of silica. In an example, a natural gypsum containing 99,3 per cent of CaSO4. 2H2O is mixed with 1 per cent of silica, ,6 per cent of orthophosphoric acid, and ,2 per cent of mono-sodium ortho-phosphate, formed into pellets and calcined in a continuous tunnel kiln at 2100-2200 DEG F. The usual accelerators or catalysts, e.g. potassium sulphate and zinc sulphate are added before grinding.
GB9012/37A 1936-05-14 1937-03-30 Improvements in hydraulic gypsum cement material and process of manufacturing the same Expired GB477743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US477743XA 1936-05-14 1936-05-14

Publications (1)

Publication Number Publication Date
GB477743A true GB477743A (en) 1938-01-05

Family

ID=21950886

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9012/37A Expired GB477743A (en) 1936-05-14 1937-03-30 Improvements in hydraulic gypsum cement material and process of manufacturing the same

Country Status (1)

Country Link
GB (1) GB477743A (en)

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