GB1260729A - Removing water from calcium sulphate - Google Patents
Removing water from calcium sulphateInfo
- Publication number
- GB1260729A GB1260729A GB2719969A GB2719969A GB1260729A GB 1260729 A GB1260729 A GB 1260729A GB 2719969 A GB2719969 A GB 2719969A GB 2719969 A GB2719969 A GB 2719969A GB 1260729 A GB1260729 A GB 1260729A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grate
- calcium sulphate
- fans
- particle size
- gas flow
- 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
Links
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title abstract 6
- 235000011132 calcium sulphate Nutrition 0.000 title abstract 3
- 239000001175 calcium sulphate Substances 0.000 title abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract 3
- 239000000567 combustion gas Substances 0.000 abstract 2
- 239000007789 gas Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 239000002245 particle Substances 0.000 abstract 2
- 239000004744 fabric Substances 0.000 abstract 1
- 229910052602 gypsum Inorganic materials 0.000 abstract 1
- 239000010440 gypsum Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000013021 overheating 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
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/036—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the dry process, e.g. dehydrating in a fluidised bed or in a rotary kiln, i.e. to obtain beta-hemihydrate
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
1,260,729. Removing water from calcium sulphate; continuous furnaces. KNAUF SAAR GIPSWERKE G.m.b.H. GEB. 29 May, 1969 [31 May, 1968; 3 Aug., 1968], No. 27199/69. Headings F4B and F4G. Water is removed from calcium sulphate by passing the material, e.g. gypsum, in the form of a body 2 of superposed horizontal layers of different particle size, on a moving air permeable grate 1 through a heating zone 4 wherein combustion gases from burner 11 are drawn through the material by fans e.g. 14, and to prevent overheating of the sloping lateral sides which are less resistant to passage of combustion gases, the lowermost layer of finest particle size is arranged to having lateral portions deeper than a central portion. This may be achieved using a shaped vertically adjustable template 18 (Fig. 3, not shown) at the exit from supply hopper 3. Preferably at least one of the lateral portions is two to five times as deep as the central portion, and as shown, a higher bank 15 on one side is provided to compensate for uneven gas flow due to there being more fans on one side than the other. This may provide a fine adjustment of gas flow, a coarse adjustment being obtained by using a grate whose free cross-sectional area varies laterally. The grate may consist of an endless air-permeable belt cover with a perforated sheet of metal, wire fabric or like mesh.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681771502 DE1771502C3 (en) | 1968-05-31 | Method of drying or firing plaster of paris of various properties | |
| DE19681758766 DE1758766C3 (en) | 1968-08-03 | 1968-08-03 | Method and device for drying or firing plaster of paris of various properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1260729A true GB1260729A (en) | 1972-01-19 |
Family
ID=25755187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2719969A Expired GB1260729A (en) | 1968-05-31 | 1969-05-29 | Removing water from calcium sulphate |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2009799A1 (en) |
| GB (1) | GB1260729A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2721916B2 (en) * | 1977-05-14 | 1979-08-30 | Babcock-Bsh Ag Vormals Buettner- Schilde-Haas Ag, 4150 Krefeld | Process for firing plaster and building plaster in a rotary kiln and rotary kiln for carrying out the process |
| LU86800A1 (en) * | 1987-03-04 | 1988-09-20 | Luc Janssens | PLANT FOR THE PREPARATION OF HIGH-STRENGTH PLASTER |
| US6083465A (en) * | 1999-03-11 | 2000-07-04 | National Gypsum Properties, Llc | Method and apparatus for continuously calcining gypsum |
-
1969
- 1969-05-29 FR FR6917967A patent/FR2009799A1/fr not_active Withdrawn
- 1969-05-29 GB GB2719969A patent/GB1260729A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2009799A1 (en) | 1970-02-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |