CH647218A5 - Verfahren zur herstellung von baumaterial auf basis von aluminiumhydroxid. - Google Patents

Verfahren zur herstellung von baumaterial auf basis von aluminiumhydroxid. Download PDF

Info

Publication number: CH647218A5
Authority: CH; Switzerland
Prior art keywords: mixture; aluminum hydroxide; ettringite; fibrous reinforcing; aluminum
Prior art date: 1980-07-19

Application number

CH4719/81A

Other languages

German (de)

English (en)

Inventor

Tatsuro Okamura

Hideki Irifune

Original Assignee

Yoshida Kogyo Kk

Tatsuro Okamura

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.)

1980-07-19

Filing date

1981-07-17

Publication date

1985-01-15

1981-07-17 Application filed by Yoshida Kogyo Kk, Tatsuro Okamura filed Critical Yoshida Kogyo Kk

1985-01-15 Publication of CH647218A5 publication Critical patent/CH647218A5/de

Links

WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims description 38
239000004566 building material Substances 0.000 title claims description 29
238000004519 manufacturing process Methods 0.000 title claims description 9
239000000203 mixture Substances 0.000 claims description 37
239000000463 material Substances 0.000 claims description 29
239000010802 sludge Substances 0.000 claims description 27
229910001653 ettringite Inorganic materials 0.000 claims description 24
OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 18
238000000034 method Methods 0.000 claims description 18
BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 16
239000000292 calcium oxide Substances 0.000 claims description 16
ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 16
239000012779 reinforcing material Substances 0.000 claims description 15
238000006243 chemical reaction Methods 0.000 claims description 13
239000002002 slurry Substances 0.000 claims description 11
239000000920 calcium hydroxide Substances 0.000 claims description 8
229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
239000010440 gypsum Substances 0.000 claims description 7
229910052602 gypsum Inorganic materials 0.000 claims description 7
239000011398 Portland cement Substances 0.000 claims description 5
239000010425 asbestos Substances 0.000 claims description 5
XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 5
229910052895 riebeckite Inorganic materials 0.000 claims description 5
DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 4
229920003043 Cellulose fiber Polymers 0.000 claims description 3
239000000835 fiber Substances 0.000 claims description 3
239000011343 solid material Substances 0.000 claims description 3
238000000354 decomposition reaction Methods 0.000 claims description 2
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 16
229910052782 aluminium Inorganic materials 0.000 description 15
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
235000008733 Citrus aurantifolia Nutrition 0.000 description 7
240000006909 Tilia x europaea Species 0.000 description 7
235000011941 Tilia x europaea Nutrition 0.000 description 7
239000004571 lime Substances 0.000 description 7
239000011541 reaction mixture Substances 0.000 description 6
239000002699 waste material Substances 0.000 description 6
238000002048 anodisation reaction Methods 0.000 description 5
239000002657 fibrous material Substances 0.000 description 5
-1 Calcium sulfate Chemical compound 0.000 description 4
230000015572 biosynthetic process Effects 0.000 description 4
239000004568 cement Substances 0.000 description 4
239000004035 construction material Substances 0.000 description 4
239000002440 industrial waste Substances 0.000 description 4
229920001131 Pulp (paper) Polymers 0.000 description 3
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
230000002378 acidificating effect Effects 0.000 description 3
AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
235000011116 calcium hydroxide Nutrition 0.000 description 3
238000010276 construction Methods 0.000 description 3
239000007858 starting material Substances 0.000 description 3
239000002351 wastewater Substances 0.000 description 3
VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
238000007743 anodising Methods 0.000 description 2
239000007795 chemical reaction product Substances 0.000 description 2
238000002485 combustion reaction Methods 0.000 description 2
238000006477 desulfuration reaction Methods 0.000 description 2
230000023556 desulfurization Effects 0.000 description 2
239000003792 electrolyte Substances 0.000 description 2
230000009969 flowable effect Effects 0.000 description 2
238000009472 formulation Methods 0.000 description 2
238000010438 heat treatment Methods 0.000 description 2
238000009413 insulation Methods 0.000 description 2
238000002156 mixing Methods 0.000 description 2
TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
239000010893 paper waste Substances 0.000 description 2
239000003208 petroleum Substances 0.000 description 2
229910001388 sodium aluminate Inorganic materials 0.000 description 2
239000007787 solid Substances 0.000 description 2
238000004381 surface treatment Methods 0.000 description 2
238000012982 x-ray structure analysis Methods 0.000 description 2
RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
229910021532 Calcite Inorganic materials 0.000 description 1
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
239000005997 Calcium carbide Substances 0.000 description 1
PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
239000002253 acid Substances 0.000 description 1
150000007513 acids Chemical class 0.000 description 1
230000002411 adverse Effects 0.000 description 1
HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
RGKMZNDDOBAZGW-UHFFFAOYSA-N aluminum calcium Chemical compound [Al].[Ca] RGKMZNDDOBAZGW-UHFFFAOYSA-N 0.000 description 1
238000005452 bending Methods 0.000 description 1
239000006227 byproduct Substances 0.000 description 1
239000011575 calcium Substances 0.000 description 1
229910052791 calcium Inorganic materials 0.000 description 1
229910000019 calcium carbonate Inorganic materials 0.000 description 1
238000005253 cladding Methods 0.000 description 1
230000015271 coagulation Effects 0.000 description 1
238000005345 coagulation Methods 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
239000000356 contaminant Substances 0.000 description 1
238000002425 crystallisation Methods 0.000 description 1
230000008025 crystallization Effects 0.000 description 1
238000005238 degreasing Methods 0.000 description 1
238000000151 deposition Methods 0.000 description 1
238000001035 drying Methods 0.000 description 1
230000000694 effects Effects 0.000 description 1
239000008151 electrolyte solution Substances 0.000 description 1
230000007613 environmental effect Effects 0.000 description 1
125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
238000001125 extrusion Methods 0.000 description 1
239000003063 flame retardant Substances 0.000 description 1
229910001679 gibbsite Inorganic materials 0.000 description 1
239000003365 glass fiber Substances 0.000 description 1
238000003306 harvesting Methods 0.000 description 1
239000011396 hydraulic cement Substances 0.000 description 1
239000012535 impurity Substances 0.000 description 1
239000012784 inorganic fiber Substances 0.000 description 1
239000011499 joint compound Substances 0.000 description 1
239000011490 mineral wool Substances 0.000 description 1
238000000465 moulding Methods 0.000 description 1
238000006386 neutralization reaction Methods 0.000 description 1
239000011505 plaster Substances 0.000 description 1
239000002244 precipitate Substances 0.000 description 1
239000002994 raw material Substances 0.000 description 1
230000009257 reactivity Effects 0.000 description 1
230000002787 reinforcement Effects 0.000 description 1
238000007493 shaping process Methods 0.000 description 1
239000000377 silicon dioxide Substances 0.000 description 1
235000012239 silicon dioxide Nutrition 0.000 description 1
229910052938 sodium sulfate Inorganic materials 0.000 description 1
235000011152 sodium sulphate Nutrition 0.000 description 1
239000000243 solution Substances 0.000 description 1
238000009987 spinning Methods 0.000 description 1
238000012916 structural analysis Methods 0.000 description 1
239000000126 substance Substances 0.000 description 1
150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
238000009941 weaving Methods 0.000 description 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Ceramic Engineering (AREA)
Chemical Kinetics & Catalysis (AREA)
Inorganic Chemistry (AREA)
Materials Engineering (AREA)
Structural Engineering (AREA)
Organic Chemistry (AREA)
Curing Cements, Concrete, And Artificial Stone (AREA)
Panels For Use In Building Construction (AREA)
Building Environments (AREA)

CH4719/81A 1980-07-19 1981-07-17 Verfahren zur herstellung von baumaterial auf basis von aluminiumhydroxid. CH647218A5 (de)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
JP10026780A JPS5727962A (en)	1980-07-19	1980-07-19	Construction material

Publications (1)

Publication Number	Publication Date
CH647218A5 true CH647218A5 (de)	1985-01-15

Family

ID=14269422

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CH4719/81A CH647218A5 (de)	1980-07-19	1981-07-17	Verfahren zur herstellung von baumaterial auf basis von aluminiumhydroxid.

Country Status (8)

Country	Link
JP (1)	JPS5727962A (it)
AU (1)	AU526410B2 (it)
CA (1)	CA1156268A (it)
CH (1)	CH647218A5 (it)
DE (1)	DE3127982A1 (it)
FR (1)	FR2493303B1 (it)
GB (1)	GB2083088B (it)
IT (1)	IT1144405B (it)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPH0657044B2 (ja) *	1983-12-03	1994-07-27	松下電器産業株式会社	光ビ−ム照射装置
ZA879217B (en) *	1986-12-09	1989-04-26	Lorenzo Valenti Gian	Hydraulic binders and building elements formed of non-traditional materials
JPH021928A (ja) *	1988-06-10	1990-01-08	Toshiba Corp	半導体集積回路
US5118219A (en) *	1991-03-21	1992-06-02	Chemstar Lime Company	Method of capping tailings ponds
JP2646882B2 (ja) *	1991-05-27	1997-08-27	株式会社豊田自動織機製作所	クラッチペダルのターンオーバ機構
FR2674239A1 (fr) *	1991-10-11	1992-09-25	Chemstar Lime Cy	Procede de recouvrement d'un bassin a effluents.
TW350894B (en) *	1994-08-02	1999-01-21	Stylite Kogyo Co Ltd	Refractory coating components, building siding panels and the siding structure
DE19503142C2 (de) *	1995-02-01	1998-12-17	Horst Prof Dr Bannwarth	Bindemittel und und dessen Verwendung
DE19517267C1 (de)	1995-05-11	1997-01-02	Redco Nv	Material mit guten Brandschutzeigenschaften und Verfahren zur Herstellung desselben
CN103206020B (zh) *	2012-01-17	2016-01-06	F顾问株式会社	积层结构体
JP2018205884A (ja) *	2017-05-31	2018-12-27	アイシン精機株式会社	荷重発生装置
JP2020200656A (ja) *	2019-06-10	2020-12-17	Ykk Ap株式会社	形材用吸熱成形体及びその製造方法
EP4573065A1 (en) *	2022-08-17	2025-06-25	Ecoscitec Innovations Pty Ltd	A method for the production of a hydraulic binder
MA67576A1 (fr) *	2024-09-11	2026-03-31	Universite Mohammed VI Polytechnique	Synthese et caracterisation de l'ettringite derivee du phosphogypse

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2465278A (en) *	1945-10-25	1949-03-22	Kaspar Winkler & Co	Expansive cement
JPS5435193B2 (it) *	1972-09-22	1979-10-31
JPS5036394A (it) *	1973-08-03	1975-04-05
JPS50148424A (it) *	1974-05-21	1975-11-28
JPS538323B2 (it) *	1974-05-31	1978-03-28
JPS516228A (ja) *	1974-07-04	1976-01-19	Taisei Corp	Funenkenzaino seizohoho
JPS52136221A (en) *	1976-05-11	1977-11-14	Asahi Glass Co Ltd	Fiberrreinforced cement compoud mainly composed of aluminous cement
JPS53137226A (en) *	1977-03-15	1978-11-30	Hiyougoken	Ettringite composite
JPS5460319A (en) *	1977-10-21	1979-05-15	Matsushita Electric Works Ltd	Production of inorganic base hardening member
JPS581063B2 (ja) *	1978-02-15	1983-01-10	松下電工株式会社	無機硬化体の製法
JPS5590458A (en) *	1978-12-26	1980-07-09	Matsushita Electric Works Ltd	Manufacture of inorganic hardened body

1980
- 1980-07-19 JP JP10026780A patent/JPS5727962A/ja active Pending
1981
- 1981-07-06 AU AU72597/81A patent/AU526410B2/en not_active Expired
- 1981-07-15 DE DE19813127982 patent/DE3127982A1/de not_active Withdrawn
- 1981-07-17 IT IT6800281A patent/IT1144405B/it active
- 1981-07-17 CH CH4719/81A patent/CH647218A5/de not_active IP Right Cessation
- 1981-07-17 FR FR8114023A patent/FR2493303B1/fr not_active Expired
- 1981-07-20 GB GB8122273A patent/GB2083088B/en not_active Expired
- 1981-08-12 CA CA000383757A patent/CA1156268A/en not_active Expired

Also Published As

Publication number	Publication date
IT1144405B (it)	1986-10-29
CA1156268A (en)	1983-11-01
FR2493303B1 (fr)	1986-08-01
AU526410B2 (en)	1983-01-06
DE3127982A1 (de)	1982-02-25
IT8168002A0 (it)	1981-07-17
GB2083088B (en)	1984-10-24
FR2493303A1 (fr)	1982-05-07
JPS5727962A (en)	1982-02-15
AU7259781A (en)	1982-05-06
GB2083088A (en)	1982-03-17

Legal Events

Date	Code	Title	Description
1994-11-15	PFA	Name/firm changed	Owner name: YKK CORPORATION
2001-08-15	PL	Patent ceased

Publication	Publication Date	Title
CH647218A5 (de)	1985-01-15	Verfahren zur herstellung von baumaterial auf basis von aluminiumhydroxid.
DE2558972A1 (de)	1976-07-08	Verfahren zur herstellung eines gehaerteten zementprodukts
DE2166486A1 (de)	1974-04-18	Verfahren zur herstellung einer modifizierten portlandzementzusammensetzung
DE2314645A1 (de)	1973-10-04	Calciumsulfat-kristallfaeden bzw. -fasern, verfahren zu ihrer herstellung und verwendung derselben
DE2613651A1 (de)	1976-10-07	Verfahren zur herstellung von alpha-hydrogips und ii-anhydrogips
DE2419562C2 (de)	1984-04-05	Verfahren zur Verbesserung der Feuerbeständigkeit von Formkörpern auf der Basis von Gips
EP0061073A1 (de)	1982-09-29	Faserwerkstoff
EP0064793B1 (de)	1985-11-06	Verfahren zur Herstellung von Gipsformsteinen
DE2621611C3 (de)	1981-06-25	Anorganische Fasern, Verfahren zu deren Herstellung sowie deren Verwendung
DE3149173C2 (de)	1986-03-27	Verfahren zur Herstellung eines Leichtbaustoffes aus industriellen Abfallprodukten
DE69509207T2 (de)	1999-08-19	Zementzusammensetzung und deren Verwendung für die Herstellung von Leichtzementen
DE2805523A1 (de)	1978-09-07	Verfahren zur herstellung von gipsbauteilen
DE2949390C2 (de)	1986-06-05	Härtbare Zusammensetzung zur Bildung von Ettringit (TSH), Zement, Gips, sowie bis zu 40 Gew.-% Fasermaterial enthaltenden Produkten
EP2655288A1 (de)	2013-10-30	Magnesiumzement
DE10326623B4 (de)	2005-05-04	Verwendung einer Mischung zur Herstellung von feuchtigkeitsbeständigen Gipsbauteilen
DE2551311C3 (de)	1982-03-25	Verfahren zur Herstellung von hydrothermal gehärteten Massen, die Verstärkungsmittel enthalten und gegebenenfalls anschließend carbonisiert werden
DE1771911C3 (de)	1975-12-11	Verfahren zum Stabilisieren von Tonerde-Zementen
CH648080A5 (de)	1985-02-28	Flammhemmendes baumaterial und verfahren zu dessen herstellung.
WO1997035807A1 (de)	1997-10-02	Verfahren zur herstellung eines präzipitats auf der basis von calciumaluminatsulfat (casul) und dessen verwendung
WO2007110428A1 (de)	2007-10-04	Gipsprodukt
DE2900613C2 (de)	1988-01-21	Verfahren zum Herstellen eines faserverstärkten, ausgehärteten Gips-Formkörpers
DE2246345C3 (de)	1979-09-20	Verfahren zur Herstellung von praktisch ausblUhungsfreien Gipsprodukten
DE2247616A1 (de)	1974-04-04	Zementartige materialien
EP0269736A1 (de)	1988-06-08	Zubereitung zur herstellung von gipsgegenständen
DE2532581A1 (de)	1976-12-23	Verfahren zur herstellung von magnesiumsulfatzement mit erhoehter festigkeit