FR2432002A2 - Platre obtenu a partir de phosphogypses et procede pour son obtention - Google Patents
Platre obtenu a partir de phosphogypses et procede pour son obtentionInfo
- Publication number
- FR2432002A2 FR2432002A2 FR7822087A FR7822087A FR2432002A2 FR 2432002 A2 FR2432002 A2 FR 2432002A2 FR 7822087 A FR7822087 A FR 7822087A FR 7822087 A FR7822087 A FR 7822087A FR 2432002 A2 FR2432002 A2 FR 2432002A2
- Authority
- FR
- France
- Prior art keywords
- gypsum
- plaster
- pref
- torr
- additive
- 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
Links
- 239000011505 plaster Substances 0.000 title abstract 5
- 239000010440 gypsum Substances 0.000 title abstract 4
- 229910052602 gypsum Inorganic materials 0.000 title abstract 4
- 229910019142 PO4 Inorganic materials 0.000 title abstract 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title 1
- 229910052788 barium Inorganic materials 0.000 title 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 title 1
- 229910052791 calcium Inorganic materials 0.000 title 1
- 239000011575 calcium Substances 0.000 title 1
- 229910052749 magnesium Inorganic materials 0.000 title 1
- 239000011777 magnesium Substances 0.000 title 1
- 239000010452 phosphate Substances 0.000 title 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title 1
- 239000000654 additive Substances 0.000 abstract 4
- 230000000996 additive effect Effects 0.000 abstract 4
- 238000010438 heat treatment Methods 0.000 abstract 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 abstract 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 abstract 2
- 101100283604 Caenorhabditis elegans pigk-1 gene Proteins 0.000 abstract 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 abstract 1
- 229910001626 barium chloride Inorganic materials 0.000 abstract 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 abstract 1
- 229910001622 calcium bromide Inorganic materials 0.000 abstract 1
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 abstract 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 1
- 239000000920 calcium hydroxide Substances 0.000 abstract 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 abstract 1
- 238000006297 dehydration reaction Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 229910001629 magnesium chloride Inorganic materials 0.000 abstract 1
- 235000021317 phosphate Nutrition 0.000 abstract 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
La présente invention a pour objet un plâtre obtenu à partir de phosphogypse et au procédé pour son obtention. Elle est caractérisée en ce que, selon ce procédé, on soumet la matière brute ou sommairement lavée à un traitement thermique en deux phases : une première phase de déshydratation, d'une durée comprise entre 30 et 90 mn environ, à une température comprise entre 110 et 150 degrés C, de préférence entre 120 et 135 degrés C, puis une seconde phase de conditionnement d'une durée allant de 10 mn à quelques heures, avec maintien de la température à une valeur sensiblement constante comprise entre 130 et 180 degrés C, de préférence entre 140 et 160 degrés C, sous une pression de vapeur d'eau au moins égale à 100 Torrs, de préférence comprise entre 150 et 250 Tom, un oxyde alcalin ou alcalino-terreux ou précurseur d'un tel oxyde étant ajouté au cours du traitement thermique. Elle se rapporte à un tel plâtre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7822087A FR2432002A2 (fr) | 1977-04-29 | 1978-07-26 | Platre obtenu a partir de phosphogypses et procede pour son obtention |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7712963A FR2388771A1 (fr) | 1977-04-29 | 1977-04-29 | Platre obtenu a partir de phosphogypses et procede pour son obtention |
| FR7822087A FR2432002A2 (fr) | 1977-04-29 | 1978-07-26 | Platre obtenu a partir de phosphogypses et procede pour son obtention |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2432002A2 true FR2432002A2 (fr) | 1980-02-22 |
| FR2432002B2 FR2432002B2 (fr) | 1982-12-03 |
Family
ID=26219987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7822087A Granted FR2432002A2 (fr) | 1977-04-29 | 1978-07-26 | Platre obtenu a partir de phosphogypses et procede pour son obtention |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2432002A2 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2237857A1 (fr) * | 1973-07-17 | 1975-02-14 | Gypsum Research |
-
1978
- 1978-07-26 FR FR7822087A patent/FR2432002A2/fr active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2237857A1 (fr) * | 1973-07-17 | 1975-02-14 | Gypsum Research |
Non-Patent Citations (1)
| Title |
|---|
| CA1974 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2432002B2 (fr) | 1982-12-03 |
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