NO125583B - - Google Patents
Download PDFInfo
- Publication number
- NO125583B NO125583B NO1942/69A NO194269A NO125583B NO 125583 B NO125583 B NO 125583B NO 1942/69 A NO1942/69 A NO 1942/69A NO 194269 A NO194269 A NO 194269A NO 125583 B NO125583 B NO 125583B
- Authority
- NO
- Norway
- Prior art keywords
- ammonium
- acid
- line
- stated
- approx
- Prior art date
Links
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 92
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 87
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 80
- GYQWAOSGJGFWAE-UHFFFAOYSA-N azane tetrafluorosilane Chemical compound N.[Si](F)(F)(F)F GYQWAOSGJGFWAE-UHFFFAOYSA-N 0.000 claims description 62
- 238000000034 method Methods 0.000 claims description 55
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 54
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 46
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 44
- 239000010440 gypsum Substances 0.000 claims description 40
- 229910052602 gypsum Inorganic materials 0.000 claims description 40
- 229910021529 ammonia Inorganic materials 0.000 claims description 38
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 36
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 36
- 239000013078 crystal Substances 0.000 claims description 28
- 239000002253 acid Substances 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 26
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 22
- 239000011737 fluorine Substances 0.000 claims description 21
- 229910052731 fluorine Inorganic materials 0.000 claims description 21
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 20
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 17
- 239000001099 ammonium carbonate Substances 0.000 claims description 17
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 17
- 238000000184 acid digestion Methods 0.000 claims description 14
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 6
- MNTPMEHIQKUBIC-UHFFFAOYSA-N silicon;hydrofluoride Chemical compound F.[Si] MNTPMEHIQKUBIC-UHFFFAOYSA-N 0.000 claims description 6
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 5
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 5
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 5
- 239000006012 monoammonium phosphate Substances 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims 1
- 239000011505 plaster Substances 0.000 claims 1
- 238000001556 precipitation Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 42
- 238000005406 washing Methods 0.000 description 34
- 239000007789 gas Substances 0.000 description 28
- 239000000706 filtrate Substances 0.000 description 22
- 239000007788 liquid Substances 0.000 description 16
- 239000002367 phosphate rock Substances 0.000 description 16
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 15
- 239000002562 thickening agent Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 13
- 239000000047 product Substances 0.000 description 12
- 239000012065 filter cake Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000001166 ammonium sulphate Substances 0.000 description 9
- 239000012452 mother liquor Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 125000004122 cyclic group Chemical group 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 239000000725 suspension Substances 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000000155 melt Substances 0.000 description 5
- 239000011541 reaction mixture Substances 0.000 description 5
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000003337 fertilizer Substances 0.000 description 4
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000005696 Diammonium phosphate Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 2
- 235000019838 diammonium phosphate Nutrition 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229910019975 (NH4)2SiF6 Inorganic materials 0.000 description 1
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 1
- 229910003638 H2SiF6 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- -1 by centrifugation Chemical compound 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 1
- 229940038472 dicalcium phosphate Drugs 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229940077441 fluorapatite Drugs 0.000 description 1
- 229910052587 fluorapatite Inorganic materials 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005670 sulfation reaction Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- ZEFWRWWINDLIIV-UHFFFAOYSA-N tetrafluorosilane;dihydrofluoride Chemical compound F.F.F[Si](F)(F)F ZEFWRWWINDLIIV-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/2343—Concentration concomitant with purification, e.g. elimination of fluorine
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treating Waste Gases (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72856168A | 1968-05-13 | 1968-05-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO125583B true NO125583B (de) | 1972-10-02 |
Family
ID=24927348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO1942/69A NO125583B (de) | 1968-05-13 | 1969-05-12 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3552919A (de) |
| DE (1) | DE1923730A1 (de) |
| FR (1) | FR2008432A1 (de) |
| GB (1) | GB1272629A (de) |
| NO (1) | NO125583B (de) |
| SE (1) | SE346524B (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR8105391A (pt) * | 1981-08-24 | 1983-03-29 | Petroleo Brasileiro Sa | Processo de solubilizacao parcial de rochas fosfaticas e posterior obtencao de acido forforico e fertilizantes fosforados |
| US9682868B2 (en) * | 2015-01-30 | 2017-06-20 | Sparstane Technologies LLC | Partially continuous countercurrent process for converting gypsum to ammonium sulfate and calcium carbonate |
-
1968
- 1968-05-13 US US728561A patent/US3552919A/en not_active Expired - Lifetime
-
1969
- 1969-05-09 DE DE19691923730 patent/DE1923730A1/de active Pending
- 1969-05-12 SE SE06696/69A patent/SE346524B/xx unknown
- 1969-05-12 NO NO1942/69A patent/NO125583B/no unknown
- 1969-05-13 GB GB24402/69A patent/GB1272629A/en not_active Expired
- 1969-05-13 FR FR6915535A patent/FR2008432A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB1272629A (en) | 1972-05-03 |
| US3552919A (en) | 1971-01-05 |
| SE346524B (de) | 1972-07-10 |
| DE1923730A1 (de) | 1970-01-15 |
| FR2008432A1 (de) | 1970-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5180569A (en) | Process for the production of phosphoric acid and hydrogen fluoride from phosphate rock and fluosilicic acid | |
| JPH0214808A (ja) | 高純度シリカおよび弗化アンモニウムの製造方法 | |
| US4062930A (en) | Method of production of anhydrous hydrogen fluoride | |
| US3273713A (en) | Removal of fluorine compounds from phosphoric acid | |
| US4046860A (en) | Ammonium fluoride process for defluorinating phosphoric acids and production of ammonium fluosilicate | |
| US4308244A (en) | Process for producing fluorine compounds and amorphous silica | |
| US4213952A (en) | Recovery of hydrofluoric acid from fluosilicic acid with high pH hydrolysis | |
| US5531975A (en) | Process for the production of phosphoric acid and calcium fluoride | |
| CN109906200B (zh) | 从氯化钾和硫酸生产硫酸钾的方法 | |
| US4056604A (en) | Production of hydrogen fluoride | |
| US4213951A (en) | Recovery of hydrofluoric acid from fluosilicic acid with high pH hydrolysis | |
| US5853685A (en) | Process for the production of high purity silica from waste by-product silica and hydrogen fluoride | |
| US7534411B2 (en) | Process for the preparation of pure silica | |
| RU2641819C2 (ru) | Способ утилизации отходов производства, содержащих фторсиликаты | |
| NO125583B (de) | ||
| US4067957A (en) | Process for producing hydrogen fluoride from an aqueous hydrofluorosilicic acid solution | |
| US3021194A (en) | Production of ammonium hydrogen fluoride | |
| US2843454A (en) | Conversion of sodium chloride into sodium carbonate and ammonia chloride | |
| US4062929A (en) | Production of hydrogen fluoride | |
| US3595610A (en) | Manufacture of ammonium phosphates | |
| WO1990008730A1 (en) | Process for removing fluoride from a wastewater and producing hydrofluoric acid therefrom | |
| US3907973A (en) | Process for defluorinating phosphoric acids and production of ammonium fluosilicate and fluosilicic acid | |
| US4610853A (en) | Process for producing purified monoammonium phosphate from wet process phosphoric acid | |
| US3338673A (en) | Recovery of substantially anhydrous hydrogen fluoride from an impure aqueous ammonium fluoride solution | |
| NO138526B (no) | Fremgangsmaate for rensning av fosforsyre |