CA1121973A - Process for the production of inorganic fibres based on calcium sulphate - Google Patents

Process for the production of inorganic fibres based on calcium sulphate

Info

Publication number: CA1121973A
Authority: CA; Canada
Prior art keywords: calcium sulphate; fibres; process according; length; group
Prior art date: 1977-07-01
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

CA000304806A

Other languages

English (en)

French (fr)

Inventor

Ekkehard Weinberg

Alois Aignesberger

Franz Vogl

Walter Lukas

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.)

Evonik Operations GmbH

Original Assignee

SKW Trostberg AG

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.)

1977-07-01

Filing date

1978-06-05

Publication date

1982-04-20

1978-06-05 Application filed by SKW Trostberg AG filed Critical SKW Trostberg AG

1982-04-20 Application granted granted Critical

1982-04-20 Publication of CA1121973A publication Critical patent/CA1121973A/en

Status Expired legal-status Critical Current

Links

OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims abstract description 67
239000001175 calcium sulphate Substances 0.000 title claims abstract description 25
235000011132 calcium sulphate Nutrition 0.000 title claims abstract description 25
238000000034 method Methods 0.000 title claims description 30
238000004519 manufacturing process Methods 0.000 title claims description 8
PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 27
229910052925 anhydrite Inorganic materials 0.000 claims abstract description 17
239000000203 mixture Substances 0.000 claims abstract description 11
239000007864 aqueous solution Substances 0.000 claims abstract description 8
ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims abstract description 8
239000012266 salt solution Substances 0.000 claims abstract description 8
239000007790 solid phase Substances 0.000 claims abstract description 4
238000006243 chemical reaction Methods 0.000 claims description 24
GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 18
229910017604 nitric acid Inorganic materials 0.000 claims description 18
150000003839 salts Chemical class 0.000 claims description 13
229910052602 gypsum Inorganic materials 0.000 claims description 10
239000010440 gypsum Substances 0.000 claims description 10
229910052751 metal Inorganic materials 0.000 claims description 10
239000002184 metal Substances 0.000 claims description 10
150000002739 metals Chemical class 0.000 claims description 5
VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
239000011541 reaction mixture Substances 0.000 claims description 4
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
-1 fluoride halide Chemical class 0.000 claims description 3
239000001117 sulphuric acid Substances 0.000 claims description 3
235000011149 sulphuric acid Nutrition 0.000 claims description 3
VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
239000004411 aluminium Substances 0.000 claims description 2
229910052782 aluminium Inorganic materials 0.000 claims description 2
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
229910021653 sulphate ion Inorganic materials 0.000 claims description 2
239000007858 starting material Substances 0.000 claims 2
WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims 1
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
239000006227 byproduct Substances 0.000 claims 1
150000004820 halides Chemical class 0.000 claims 1
229910052744 lithium Inorganic materials 0.000 claims 1
229910052749 magnesium Inorganic materials 0.000 claims 1
239000011777 magnesium Substances 0.000 claims 1
229910052725 zinc Inorganic materials 0.000 claims 1
239000011701 zinc Substances 0.000 claims 1
239000011111 cardboard Substances 0.000 abstract description 3
239000011230 binding agent Substances 0.000 abstract description 2
239000011087 paperboard Substances 0.000 abstract description 2
230000003014 reinforcing effect Effects 0.000 abstract description 2
229920003002 synthetic resin Polymers 0.000 abstract description 2
239000000057 synthetic resin Substances 0.000 abstract description 2
230000002787 reinforcement Effects 0.000 abstract 1
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 28
239000000243 solution Substances 0.000 description 20
238000002425 crystallisation Methods 0.000 description 19
TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 14
150000004683 dihydrates Chemical class 0.000 description 14
239000000835 fiber Substances 0.000 description 12
230000015572 biosynthetic process Effects 0.000 description 10
229910001629 magnesium chloride Inorganic materials 0.000 description 7
PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 6
239000002253 acid Substances 0.000 description 6
NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 6
239000000463 material Substances 0.000 description 5
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
239000011575 calcium Substances 0.000 description 4
229910052791 calcium Inorganic materials 0.000 description 4
KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
239000003960 organic solvent Substances 0.000 description 4
IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 4
FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 3
150000007513 acids Chemical class 0.000 description 3
KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
229910052938 sodium sulfate Inorganic materials 0.000 description 3
235000011152 sodium sulphate Nutrition 0.000 description 3
238000005728 strengthening Methods 0.000 description 3
NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
239000001164 aluminium sulphate Substances 0.000 description 2
235000011128 aluminium sulphate Nutrition 0.000 description 2
VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
239000013078 crystal Substances 0.000 description 2
BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 2
238000010438 heat treatment Methods 0.000 description 2
150000007522 mineralic acids Chemical class 0.000 description 2
239000012071 phase Substances 0.000 description 2
239000004323 potassium nitrate Substances 0.000 description 2
235000010333 potassium nitrate Nutrition 0.000 description 2
239000011780 sodium chloride Substances 0.000 description 2
239000011592 zinc chloride Substances 0.000 description 2
235000005074 zinc chloride Nutrition 0.000 description 2
QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical class [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
241000003910 Baronia <angiosperm> Species 0.000 description 1
UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
241000196324 Embryophyta Species 0.000 description 1
241000272476 Gyps Species 0.000 description 1
101150107341 RERE gene Proteins 0.000 description 1
XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
150000001242 acetic acid derivatives Chemical class 0.000 description 1
239000000654 additive Substances 0.000 description 1
239000000956 alloy Substances 0.000 description 1
229910045601 alloy Inorganic materials 0.000 description 1
235000019270 ammonium chloride Nutrition 0.000 description 1
VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 description 1
238000009835 boiling Methods 0.000 description 1
KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
239000004327 boric acid Substances 0.000 description 1
150000003842 bromide salts Chemical class 0.000 description 1
239000001110 calcium chloride Substances 0.000 description 1
229910001628 calcium chloride Inorganic materials 0.000 description 1
GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
239000004295 calcium sulphite Substances 0.000 description 1
235000010261 calcium sulphite Nutrition 0.000 description 1
239000004202 carbamide Substances 0.000 description 1
150000001805 chlorine compounds Chemical class 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
238000001816 cooling Methods 0.000 description 1
230000007423 decrease Effects 0.000 description 1
VCSZKSHWUBFOOE-UHFFFAOYSA-N dioxidanium;sulfate Chemical compound O.O.OS(O)(=O)=O VCSZKSHWUBFOOE-UHFFFAOYSA-N 0.000 description 1
239000004744 fabric Substances 0.000 description 1
230000002349 favourable effect Effects 0.000 description 1
239000011521 glass Substances 0.000 description 1
239000012535 impurity Substances 0.000 description 1
229910052500 inorganic mineral Inorganic materials 0.000 description 1
238000009413 insulation Methods 0.000 description 1
238000011835 investigation Methods 0.000 description 1
150000004694 iodide salts Chemical class 0.000 description 1
239000011159 matrix material Substances 0.000 description 1
238000001000 micrograph Methods 0.000 description 1
235000010755 mineral Nutrition 0.000 description 1
239000011707 mineral Substances 0.000 description 1
150000002823 nitrates Chemical class 0.000 description 1
150000007524 organic acids Chemical class 0.000 description 1
235000005985 organic acids Nutrition 0.000 description 1
150000003891 oxalate salts Chemical class 0.000 description 1
230000003647 oxidation Effects 0.000 description 1
238000007254 oxidation reaction Methods 0.000 description 1
239000000123 paper Substances 0.000 description 1
239000001103 potassium chloride Substances 0.000 description 1
235000011164 potassium chloride Nutrition 0.000 description 1
238000001556 precipitation Methods 0.000 description 1
239000011814 protection agent Substances 0.000 description 1
239000012429 reaction media Substances 0.000 description 1
230000035484 reaction time Effects 0.000 description 1
238000011084 recovery Methods 0.000 description 1
238000004064 recycling Methods 0.000 description 1
239000007787 solid Substances 0.000 description 1
239000011343 solid material Substances 0.000 description 1
239000002904 solvent Substances 0.000 description 1
239000011877 solvent mixture Substances 0.000 description 1
150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
239000000725 suspension Substances 0.000 description 1
239000004753 textile Substances 0.000 description 1
239000002912 waste gas Substances 0.000 description 1
239000002699 waste material Substances 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/08—Oxygen-containing compounds
- 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
- C01F11/466—Conversion of one form of calcium sulfate to another
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer

Landscapes

Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Engineering & Computer Science (AREA)
Ceramic Engineering (AREA)
Polymers & Plastics (AREA)
Health & Medical Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Medicinal Chemistry (AREA)
Life Sciences & Earth Sciences (AREA)
Inorganic Chemistry (AREA)
Civil Engineering (AREA)
Geology (AREA)
Materials Engineering (AREA)
Structural Engineering (AREA)
Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Inorganic Fibers (AREA)
Paper (AREA)

CA000304806A 1977-07-01 1978-06-05 Process for the production of inorganic fibres based on calcium sulphate Expired CA1121973A (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DEP2729842.6		1977-07-01
DE2729842A DE2729842B2 (de)	1977-07-01	1977-07-01	Verfahren zur Herstellung von anorganischen Fasern auf Basis von Calciumsulfat

Publications (1)

Publication Number	Publication Date
CA1121973A true CA1121973A (en)	1982-04-20

Family

ID=6012958

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000304806A Expired CA1121973A (en)	1977-07-01	1978-06-05	Process for the production of inorganic fibres based on calcium sulphate

Country Status (8)

Country	Link
JP (1)	JPS5418927A (de)
AT (1)	AT361103B (de)
CA (1)	CA1121973A (de)
DE (1)	DE2729842B2 (de)
FR (1)	FR2395965A1 (de)
GB (1)	GB1597668A (de)
IT (1)	IT1109145B (de)
SE (1)	SE431234B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2011363B (en) *	1977-12-29	1982-07-14	Idemitsu Kosan Co	Production of calcium sulphate
US4801355A (en) *	1987-01-16	1989-01-31	United States Gypsum Company	Tabular acicular gypsum and method of filling paper
FR2629069B1 (fr) *	1988-03-24	1990-11-23	Lafarge Sa Platres	Procede de preparation de sulfate de calcium a structure cristalline longiligne dotee d'une longueur et d'un facteur de forme maitrises
FR2640961B1 (de) *	1988-12-22	1993-04-02	Lafarge Platres
US7273579B2 (en) *	2004-01-28	2007-09-25	United States Gypsum Company	Process for production of gypsum/fiber board

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR932226A (fr) *	1946-08-13	1948-03-16	Cie Des Phosphates Et Du Chemi	Procédé pour favoriser la formation d'aiguilles dans les précipités de gypse
GB1038025A (en) *	1963-08-16	1966-08-03	Bpb Industries Ltd	Lightweight material and production thereof
US4029512A (en) *	1974-08-05	1977-06-14	Johns-Manville Corporation	Method for the preparation of fibrous insoluble calcium sulfate anhydrite
SE7601262L (sv) *	1975-02-07	1976-08-09	Ici Ltd	Fiberarmerat material och sett for dess framstellning
JPS51109295A (ja) *	1975-03-22	1976-09-28	Idemitsu Kosan Co	Kaishitsusaretaketsushoseisetsukoseninoseizohoho
DE2621611C3 (de) *	1976-05-14	1981-06-25	Skw Trostberg Ag, 8223 Trostberg	Anorganische Fasern, Verfahren zu deren Herstellung sowie deren Verwendung

1977
- 1977-07-01 DE DE2729842A patent/DE2729842B2/de not_active Ceased
1978
- 1978-05-16 GB GB19980/78A patent/GB1597668A/en not_active Expired
- 1978-06-05 CA CA000304806A patent/CA1121973A/en not_active Expired
- 1978-06-13 IT IT68375/78A patent/IT1109145B/it active
- 1978-06-29 SE SE7807379A patent/SE431234B/sv unknown
- 1978-06-30 AT AT477378A patent/AT361103B/de not_active IP Right Cessation
- 1978-06-30 FR FR7819694A patent/FR2395965A1/fr not_active Withdrawn
- 1978-06-30 JP JP7969878A patent/JPS5418927A/ja active Pending

Also Published As

Publication number	Publication date
ATA477378A (de)	1980-07-15
AT361103B (de)	1981-02-25
JPS5418927A (en)	1979-02-13
SE431234B (sv)	1984-01-23
IT7868375A0 (it)	1978-06-13
GB1597668A (en)	1981-09-09
DE2729842A1 (de)	1979-01-25
FR2395965A1 (fr)	1979-01-26
IT1109145B (it)	1985-12-16
SE7807379L (sv)	1979-01-02
DE2729842B2 (de)	1979-05-23

Legal Events

Date	Code	Title	Description
1999-04-20	MKEX	Expiry

Publication	Publication Date	Title
CA1217028A (en)	1987-01-27	Method for the production of potassium sulfate using sulfuric acid and potassium chloride
US4207297A (en)	1980-06-10	Process for producing high purity lithium carbonate
DE2519122C2 (de)	1985-02-28	Verfahren zur Herstellung von &alpha;-Calciumsulfathalbhydrat
NO118198B (de)	1969-11-24
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CA1121973A (en)	1982-04-20	Process for the production of inorganic fibres based on calcium sulphate
EP0024131B1 (de)	1984-03-21	Verfahren zur Gewinnung von Tonerde aus Ton und anderen Alumosilikaten und nach diesem Verfahren hergestellte Tonerde
US4210626A (en)	1980-07-01	Manufacture of magnesium carbonate and calcium sulphate from brine mud
US4217333A (en)	1980-08-12	Process for the production of potassium magnesium phosphate
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US4402922A (en)	1983-09-06	Process for rapid conversion of fluoroanhydrite to gypsum
US4379776A (en)	1983-04-12	Process for reducing aluminum and fluorine in phosphoric acids
US3032391A (en)	1962-05-01	Production of calcium borates
US4394368A (en)	1983-07-19	High temperature hydrolysis of aluminum sulfate solutions
US2733132A (en)	1956-01-31	patewo
CN1131124A (zh)	1996-09-18	以莹石为原料生产氟硅酸钠
EP0642467B1 (de)	1995-12-13	Verfahren zur direkten herstellung von alpha-calciumsulfathalbhydrat bei atmosphären druck
CA1217027A (en)	1987-01-27	Process for producing and decomposing syngenite for producing k.sub.3h(so.sub.4).sub.2 crystals and potassium sulfate crystals, and for producing potassium nitrate
JPH1017318A (ja)	1998-01-20	純粋な合成カルシウムほう酸塩の製造方法