WO2008141627A1 - Verfahren zur herstellung von alpha-calciumsulfat-halbhydrat aus calciumsulfat-dihydrat - Google Patents
Verfahren zur herstellung von alpha-calciumsulfat-halbhydrat aus calciumsulfat-dihydrat Download PDFInfo
- Publication number
- WO2008141627A1 WO2008141627A1 PCT/DE2008/000854 DE2008000854W WO2008141627A1 WO 2008141627 A1 WO2008141627 A1 WO 2008141627A1 DE 2008000854 W DE2008000854 W DE 2008000854W WO 2008141627 A1 WO2008141627 A1 WO 2008141627A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- calcium sulfate
- stirred autoclave
- alpha
- dihydrate
- water
- Prior art date
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- 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
- C04B11/032—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the wet process, e.g. dehydrating in solution or under saturated vapour conditions, i.e. to obtain alpha-hemihydrate
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- 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
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- Y10T29/49133—Assembling to base an electrical component, e.g., capacitor, etc. with component orienting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
- Y10T29/49139—Assembling to base an electrical component, e.g., capacitor, etc. by inserting component lead or terminal into base aperture
Definitions
- Gypsum is the mineralogical technical name of the chemical compound of calcium sulfate dihydrate (CaSO 4 x 2H 2 O).
- gypsum VA By supplying thermal energy, gypsum VA loses molecules of its chemically bound water of crystallization per formula unit, thereby converting the calcium sulfate dihydrate to calcium sulfate hemihydrate CaSO 4 .5H 2 O.
- calcium sulfate hemihydrate There are two technical forms of calcium sulfate hemihydrate, which are often distinguished in practice as alpha and beta modifications, although they are chemically mineralogically identical. If the supply of thermal energy at atmospheric pressure, so you get the beta-modification of calcium sulfate hemihydrate.
- the grains of such a combustion product have a high intrinsic porosity and consist of innumerable single crystallites.
- a binder made from this hemihydrate Due to the high surface area, a binder made from this hemihydrate has a high water requirement during processing, resulting in a water-gypsum value of about 0.6-1.0. (Determined by litter quantity, test according to EN 13279-1, September 2005). This means that low strength is obtained during processing.
- the beta modification is the main component of stucco, which is of great importance as a binder for gypsum mortar and gypsum plasterboard production.
- the present invention relates to the preparation of the other form of calcium sulfate hemihydrate, alpha modification.
- the preparation of this alpha modification of the calcium sulfate hemihydrate is carried out from supersaturated aqueous solutions, in solutions of electrolytes of acids and salts or at elevated temperature and elevated vapor pressure in autoclaves. These conversions are typically performed using additives that affect the morphology of the resulting crystals in a desired shape.
- finely divided material is converted in the horizontal agitator autoclave with or without additives with no or very little water. Drying can take place in an autoclave or in a downstream aggregate.
- the raw material is given with a certain proportion of surface moisture with a reduced proportion of water of crystallization, that additives are added, that the pressure is regulated after a preselected time course, that water vapor is removed and air is mixed , And that a separate downstream drying device is provided.
- the method of the invention is therefore based on the object of specifying a method and a device for producing alpha-calcium sulfate hemihydrate from calcium dihydrate, which unfolds its effect in an energy-saving manner in a cost-effective and technically reliable manner.
- FIG. 1 an agitator autoclave according to the invention
- FIG. 2 an agitator autoclave according to the invention with peripheral units
- the agitator autoclave (1) shown in FIG. 1 on its base frame (2) is characterized in particular by the fact that it has chains (3) suspended in the reaction space in the region of the agitator (5).
- the application of ultrasound can both promote the homogenization processes and reduce the caking of material.
- a similar effect has particular, the adhesion of caking preventing, neutral for the conversion process, additional coatings of the internal system parts.
- the effect of the chain links stripping off the unwanted material approach by gravity can be enhanced by fitting more or less heavy bodies such as cubes or similar platonic bodies instead of or in addition to individual chain links.
- Process heat in the form of water vapor is supplied via the steam supply (15) between the inner jacket (6) and the outer jacket of the stirred autoclave.
- the resulting condensate is drained via the condensate drain (4).
- the central agitator (5) is also heated by the steam supply (8), whereby the resulting condensate can flow off via the condensate drain (7).
- Wind energy or residual heat arising from atomic processes Electric energy generated in every conceivable way can be fed to the process - especially via microwaves.
- the compressed air required for the process is supplied via the compressed air supply (9).
- the raw material is fed via the raw material input (14).
- the material After the conversion of calcium sulfate dihydrate and the crystallization to alpha-calcium sulfate hemihydrate, the material remains in the autoclave. Furthermore, thermal energy is fed into the double jacket of the autoclave, but the pressure in the reaction space is continuously reduced. This increases the saturation temperature difference between the heated jacket and the reaction space, which leads to a higher energy flow and thus to an accelerated drying. The drying process is completed, in which compressed air is briefly blown into the reaction space. The heated compressed air has a great potential for absorbing the residual moisture from the alpha-calcium sulfate hemihydrate.
- the absolutely dry alpha-calcium sulfate hemihydrate is emptied from the reaction space and can now be removed from the outlet (10).
- the process steam outlet is via the opening (12) and a possible inspection of the system is possible via the inspection opening (11).
- the centrifugal separation of dusts is used in chemical engineering
- Cyclones This is a cylindrical apparatus that tapers in the lower area.
- the raw gas to be dedusted flows from above tangentially into the cyclone and is forced through the cyclone wall to a circular path. This creates a rotating gas vortex.
- Dust particles are thrown by the centrifugal force to the wall, flocculate
- the gas vortex rotates on the apparatus wall down into the narrowing part and thereby reduces its diameter. Since he is down can not escape from the apparatus, it is deflected at the bottom of the apparatus and rises rotating with reduced diameter upwards, where he leaves the cyclone through the dip tube.
- the steam cyclone (17) serves to purify the process steam from the resulting dusts. This succeeds in this stage with a
- the dust produced in the steam cyclone is mostly alpha-calcium sulfate hemihydrate nuclei which can be added to the autoclave (1) via the designated recirculation (20). The remaining dusts are then removed via the venturi scrubber (19). discharged and can also be added to the overall process.
- the process water pump (23) delivers the water taken from the water supply (22) via the spray nozzles (13) into the stirred autoclave (1)
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES08758095T ES2402838T3 (es) | 2007-05-24 | 2008-05-20 | Método para la producción de hemihidrato de sulfato de calcio alfa a partir de dihidrato de sulfato de calcio |
KR1020097024373A KR101121656B1 (ko) | 2007-05-24 | 2008-05-20 | 알파-황산칼슘 반수화물 제조 방법 및 장치 |
DE112008002038T DE112008002038A5 (de) | 2007-05-24 | 2008-05-20 | Verfahren zur Herstellung von Alpha-Calciumsulfat-Halbhydrat aus Calciumsulfat-Dihydrat |
JP2010508697A JP5161959B2 (ja) | 2007-05-24 | 2008-05-20 | 硫酸カルシウム二水和物からα‐硫酸カルシウム半水和物を製造する方法 |
EP08758095A EP2150504B1 (de) | 2007-05-24 | 2008-05-20 | Verfahren zur herstellung von alpha-calciumsulfat-halbhydrat aus calciumsulfat-dihydrat |
US12/601,033 US7951352B2 (en) | 2007-05-24 | 2008-05-20 | Method for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate |
CN2008800173554A CN101679115B (zh) | 2007-05-24 | 2008-05-20 | 用于从二水硫酸钙生产α-半水硫酸钙的方法 |
CA2685984A CA2685984C (en) | 2007-05-24 | 2008-05-20 | Process for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate |
PL08758095T PL2150504T3 (pl) | 2007-05-24 | 2008-05-20 | Sposób wytwarzania półwodzianu alfa siarczanu wapnia z dwuwodzianu siarczanu wapnia |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007024189.7 | 2007-05-24 | ||
DE102007024188A DE102007024188B3 (de) | 2007-05-24 | 2007-05-24 | Verfahren zur Herstellung von Alpha-Calciumsulfat-Halbhydrat aus Calciumsulfat-Dihydrat und zugehörige Vorrichtung |
Publications (1)
Publication Number | Publication Date |
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WO2008141627A1 true WO2008141627A1 (de) | 2008-11-27 |
Family
ID=39154956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2008/000854 WO2008141627A1 (de) | 2007-05-24 | 2008-05-20 | Verfahren zur herstellung von alpha-calciumsulfat-halbhydrat aus calciumsulfat-dihydrat |
Country Status (13)
Country | Link |
---|---|
US (1) | US7951352B2 (de) |
EP (1) | EP2150504B1 (de) |
JP (1) | JP5161959B2 (de) |
KR (1) | KR101121656B1 (de) |
CN (1) | CN101679115B (de) |
CA (1) | CA2685984C (de) |
DE (2) | DE102007024188B3 (de) |
ES (1) | ES2402838T3 (de) |
PL (1) | PL2150504T3 (de) |
PT (1) | PT2150504E (de) |
RU (1) | RU2415818C1 (de) |
UA (1) | UA92123C2 (de) |
WO (1) | WO2008141627A1 (de) |
Cited By (1)
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---|---|---|---|---|
WO2021254550A1 (de) * | 2020-06-16 | 2021-12-23 | ARCUS Greencycling Technologies GmbH | Schneckenförderer; verfahren zur beseitigung bzw. verhinderung von ablagerungen an einer innenwand eines rohres eines schneckenförderers |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102874858B (zh) * | 2012-09-21 | 2014-10-22 | 孟庆前 | 一种工业副产品石膏的α晶型生产装置及方法 |
EP2929931B1 (de) * | 2014-02-11 | 2017-09-13 | Kai Liu | Solarbetriebene autoklav-vorrichtung |
CN104984699A (zh) * | 2015-07-24 | 2015-10-21 | 南京西普水泥工程集团有限公司 | 一种有机肥反应釜电加热系统及其方法 |
IL266008B (en) * | 2016-10-17 | 2022-08-01 | Lidds Ab | A new method for producing anvil sulfate hemihydrate with unique properties |
CN108439451A (zh) * | 2018-06-25 | 2018-08-24 | 中化重庆涪陵化工有限公司 | 利用磷石膏制备轻质碳酸钙的方法 |
DE102018132084B4 (de) * | 2018-12-13 | 2020-10-15 | ARCUS Greencycling Technologies GmbH | Schneckenförderer; Verfahren zur Beseitigung bzw. Verhinderung von Ablagerungen an einer Innenwand eines Rohres eines Schneckenförderers |
DE102018132082A1 (de) * | 2018-12-13 | 2020-06-18 | HKR Beteiligungs GmbH | Schneckenförderer; Pyrolyseanlage; Verfahren zur Pyrolysierung eines Materials mittels eines beheizbaren Pyrolysereaktors |
CN109911927B (zh) * | 2019-04-19 | 2024-05-10 | 王焕德 | 吸水结构、压力容器以及从其内部吸水的方法 |
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US1901051A (en) | 1929-08-08 | 1933-03-14 | United States Gypsum Co | High strength calcined gypsum and process of manufacturing same |
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2007
- 2007-05-24 DE DE102007024188A patent/DE102007024188B3/de not_active Expired - Fee Related
-
2008
- 2008-05-20 PL PL08758095T patent/PL2150504T3/pl unknown
- 2008-05-20 PT PT87580957T patent/PT2150504E/pt unknown
- 2008-05-20 EP EP08758095A patent/EP2150504B1/de active Active
- 2008-05-20 UA UAA200912011A patent/UA92123C2/ru unknown
- 2008-05-20 CN CN2008800173554A patent/CN101679115B/zh not_active Expired - Fee Related
- 2008-05-20 RU RU2009148040/03A patent/RU2415818C1/ru active
- 2008-05-20 JP JP2010508697A patent/JP5161959B2/ja not_active Expired - Fee Related
- 2008-05-20 WO PCT/DE2008/000854 patent/WO2008141627A1/de active Application Filing
- 2008-05-20 DE DE112008002038T patent/DE112008002038A5/de not_active Withdrawn
- 2008-05-20 KR KR1020097024373A patent/KR101121656B1/ko active IP Right Grant
- 2008-05-20 ES ES08758095T patent/ES2402838T3/es active Active
- 2008-05-20 CA CA2685984A patent/CA2685984C/en active Active
- 2008-05-20 US US12/601,033 patent/US7951352B2/en active Active
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DE344478C (de) | 1920-02-18 | 1921-11-24 | William Malam Brothers | Verfahren zur Herstellung von Gips |
US1901051A (en) | 1929-08-08 | 1933-03-14 | United States Gypsum Co | High strength calcined gypsum and process of manufacturing same |
GB563019A (en) | 1942-12-21 | 1944-07-26 | Cuthbert Leslie Haddon | Improvements in the manufacture of plaster of paris |
DE937276C (de) | 1950-04-18 | 1955-12-29 | Edmund Boergardts | Verfahren und Vorrichtung zum Brennen von Gips |
US2616789A (en) | 1951-03-19 | 1952-11-04 | Certain Teed Prod Corp | Method of producing gypsum plaster |
DE952967C (de) | 1952-01-01 | 1956-11-22 | Emil Thiel | Anlage zum Entwaessern von Gips durch ueberhitzten gespannten Dampf |
DE1157128B (de) | 1962-05-25 | 1963-11-07 | Giulini Ges Mit Beschraenkter | Verfahren zur Herstellung von ª‡-Calciumsulfat-Halbhydrat aus synthetischem Calciumsulfat-Dihydrat |
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DE3819652C3 (de) | 1987-05-22 | 1996-08-01 | Pro Mineral Ges | Verfahren zur Erzeugung von als Baustoff geeignetem Calciumsulfat-Alphahalbhydrat aus feuchtem, feinteiligem Rauchgasentschwefelungsgips und seine Verwendung |
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WO2021254550A1 (de) * | 2020-06-16 | 2021-12-23 | ARCUS Greencycling Technologies GmbH | Schneckenförderer; verfahren zur beseitigung bzw. verhinderung von ablagerungen an einer innenwand eines rohres eines schneckenförderers |
Also Published As
Publication number | Publication date |
---|---|
US7951352B2 (en) | 2011-05-31 |
CN101679115B (zh) | 2012-07-04 |
JP5161959B2 (ja) | 2013-03-13 |
EP2150504B1 (de) | 2013-02-27 |
KR20100051590A (ko) | 2010-05-17 |
CN101679115A (zh) | 2010-03-24 |
UA92123C2 (ru) | 2010-09-27 |
DE112008002038A5 (de) | 2010-04-29 |
CA2685984C (en) | 2012-07-03 |
US20100166640A1 (en) | 2010-07-01 |
PL2150504T3 (pl) | 2013-06-28 |
DE102007024188B3 (de) | 2008-04-10 |
ES2402838T3 (es) | 2013-05-09 |
RU2415818C1 (ru) | 2011-04-10 |
PT2150504E (pt) | 2013-04-16 |
CA2685984A1 (en) | 2008-11-27 |
EP2150504A1 (de) | 2010-02-10 |
KR101121656B1 (ko) | 2012-04-16 |
JP2010527876A (ja) | 2010-08-19 |
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