FR2142135A5 - Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate - Google Patents

Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate

Info

Publication number
FR2142135A5
FR2142135A5 FR7121509A FR7121509A FR2142135A5 FR 2142135 A5 FR2142135 A5 FR 2142135A5 FR 7121509 A FR7121509 A FR 7121509A FR 7121509 A FR7121509 A FR 7121509A FR 2142135 A5 FR2142135 A5 FR 2142135A5
Authority
FR
France
Prior art keywords
fluorine
escape
hydroxide
carbonate
calcium oxide
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
FR7121509A
Other languages
French (fr)
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.)
INST UDOBRENIYAM
Original Assignee
INST UDOBRENIYAM
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 INST UDOBRENIYAM filed Critical INST UDOBRENIYAM
Priority to FR7121509A priority Critical patent/FR2142135A5/en
Application granted granted Critical
Publication of FR2142135A5 publication Critical patent/FR2142135A5/en
Expired 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
    • C01F11/468—Purification of calcium 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
    • 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

Abstract

Contamination of the atmosphere and corrosion of the drying apparatus are prevented by adding to gypsum a minor amt. of CaO, Ca(OH)2 or CaCO3, and heating the mixture at 200-600 degrees C. The presence of a small amt. of fluorine (e.g. 0.27 wt %) improves the quality of the subsequently produced Portland cement.
FR7121509A 1971-06-14 1971-06-14 Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate Expired FR2142135A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7121509A FR2142135A5 (en) 1971-06-14 1971-06-14 Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7121509A FR2142135A5 (en) 1971-06-14 1971-06-14 Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate

Publications (1)

Publication Number Publication Date
FR2142135A5 true FR2142135A5 (en) 1973-01-26

Family

ID=9078601

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7121509A Expired FR2142135A5 (en) 1971-06-14 1971-06-14 Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate

Country Status (1)

Country Link
FR (1) FR2142135A5 (en)

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Legal Events

Date Code Title Description
ST Notification of lapse