DD288147A5 - Verfahren zur entfernung von schwermetallen, insbesondere cadmium, aus phosphorsaeure enthaltenden loesungen - Google Patents
Verfahren zur entfernung von schwermetallen, insbesondere cadmium, aus phosphorsaeure enthaltenden loesungen Download PDFInfo
- Publication number
- DD288147A5 DD288147A5 DD89326246A DD32624689A DD288147A5 DD 288147 A5 DD288147 A5 DD 288147A5 DD 89326246 A DD89326246 A DD 89326246A DD 32624689 A DD32624689 A DD 32624689A DD 288147 A5 DD288147 A5 DD 288147A5
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- heavy metals
- phosphoric acid
- solution
- cadmium
- removal
- Prior art date
Links
- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 39
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 35
- 150000003016 phosphoric acids Chemical class 0.000 title description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 32
- 239000012452 mother liquor Substances 0.000 claims abstract description 26
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000001506 calcium phosphate Substances 0.000 claims abstract description 14
- 235000011010 calcium phosphates Nutrition 0.000 claims abstract description 14
- 239000002244 precipitate Substances 0.000 claims abstract description 14
- 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 claims abstract description 14
- 229910000389 calcium phosphate Inorganic materials 0.000 claims abstract description 13
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 239000010802 sludge Substances 0.000 claims abstract description 9
- 230000029087 digestion Effects 0.000 claims abstract description 8
- 238000005188 flotation Methods 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011575 calcium Substances 0.000 claims abstract description 6
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- SKOLWUPSYHWYAM-UHFFFAOYSA-N carbonodithioic O,S-acid Chemical compound SC(S)=O SKOLWUPSYHWYAM-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000001556 precipitation Methods 0.000 claims description 28
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 159000000001 potassium salts Chemical class 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 37
- 239000012991 xanthate Substances 0.000 description 25
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 18
- 229910019142 PO4 Inorganic materials 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 6
- 239000010452 phosphate Substances 0.000 description 6
- 235000021317 phosphate Nutrition 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- FLVLHHSRQUTOJM-UHFFFAOYSA-M sodium;2-methylpropoxymethanedithioate Chemical compound [Na+].CC(C)COC([S-])=S FLVLHHSRQUTOJM-UHFFFAOYSA-M 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 5
- ZTHBGWDIOJXYNC-UHFFFAOYSA-M potassium;hexoxymethanedithioate Chemical compound [K+].CCCCCCOC([S-])=S ZTHBGWDIOJXYNC-UHFFFAOYSA-M 0.000 description 5
- YIBBMDDEXKBIAM-UHFFFAOYSA-M potassium;pentoxymethanedithioate Chemical compound [K+].CCCCCOC([S-])=S YIBBMDDEXKBIAM-UHFFFAOYSA-M 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- -1 dithiophosphoric acid compound Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- RZFBEFUNINJXRQ-UHFFFAOYSA-M sodium ethyl xanthate Chemical compound [Na+].CCOC([S-])=S RZFBEFUNINJXRQ-UHFFFAOYSA-M 0.000 description 3
- IRZFQKXEKAODTJ-UHFFFAOYSA-M sodium;propan-2-yloxymethanedithioate Chemical compound [Na+].CC(C)OC([S-])=S IRZFQKXEKAODTJ-UHFFFAOYSA-M 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- TUZCOAQWCRRVIP-UHFFFAOYSA-N butoxymethanedithioic acid Chemical class CCCCOC(S)=S TUZCOAQWCRRVIP-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- LFMJCPXFFQURMB-UHFFFAOYSA-L cadmium(2+);ethoxymethanedithioate Chemical compound [Cd+2].CCOC([S-])=S.CCOC([S-])=S LFMJCPXFFQURMB-UHFFFAOYSA-L 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000000622 liquid--liquid extraction Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- JCBJVAJGLKENNC-UHFFFAOYSA-M potassium ethyl xanthate Chemical group [K+].CCOC([S-])=S JCBJVAJGLKENNC-UHFFFAOYSA-M 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
-
- 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
- C01B25/237—Selective elimination of impurities
- C01B25/238—Cationic impurities, e.g. arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G11/00—Compounds of cadmium
- C01G11/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B17/00—Obtaining cadmium
- C22B17/04—Obtaining cadmium by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
- C22B3/34—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing sulfur, e.g. sulfonium
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Removal Of Specific Substances (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Extraction Or Liquid Replacement (AREA)
- Treatment Of Sludge (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO880990A NO164768C (no) | 1988-03-04 | 1988-03-04 | Fremgangsmaate for fjerning av tungmetaller, spesielt kadmium, fra fosforsyreholdige loesninger. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DD288147A5 true DD288147A5 (de) | 1991-03-21 |
Family
ID=19890717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DD89326246A DD288147A5 (de) | 1988-03-04 | 1989-03-03 | Verfahren zur entfernung von schwermetallen, insbesondere cadmium, aus phosphorsaeure enthaltenden loesungen |
Country Status (21)
| Country | Link |
|---|---|
| US (1) | US4986970A (es) |
| EP (1) | EP0363455A1 (es) |
| CN (1) | CN1036745A (es) |
| AU (1) | AU3199489A (es) |
| CS (1) | CS274579B2 (es) |
| DD (1) | DD288147A5 (es) |
| ES (1) | ES2010149A6 (es) |
| FI (1) | FI895225A0 (es) |
| GR (1) | GR890100128A (es) |
| HU (1) | HU203502B (es) |
| IL (1) | IL89452A0 (es) |
| JO (1) | JO1563B1 (es) |
| MA (1) | MA21503A1 (es) |
| NO (1) | NO164768C (es) |
| NZ (1) | NZ228157A (es) |
| PL (1) | PL153527B1 (es) |
| PT (1) | PT89902A (es) |
| TN (1) | TNSN89023A1 (es) |
| WO (1) | WO1989008075A1 (es) |
| YU (1) | YU45889A (es) |
| ZA (1) | ZA891499B (es) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2649391B1 (fr) * | 1989-07-04 | 1991-10-31 | Pierre Becker | Procede de traitement de l'acide phosphorique pour en eliminer certains metaux lourds |
| US5320759A (en) * | 1992-06-11 | 1994-06-14 | Hazen Research, Inc. | Selective recovery of heavy metals using xanthates |
| EP0811580A3 (en) * | 1996-06-07 | 1998-12-02 | Shiro Yoshizaki | Method for removing heavy metal from sludge |
| TWI257915B (en) * | 2004-06-29 | 2006-07-11 | Yung-Hsiung Hsu | Processes for purifying phosphoric acid |
| US9028787B2 (en) * | 2009-09-25 | 2015-05-12 | Cytec Technology Corp. | Preventing or reducing scale in wet-process phosphoric acid production |
| US8900539B2 (en) * | 2011-03-22 | 2014-12-02 | Cytec Technology Corp. | Preventing or reducing scale in wet-process phosphoric acid production |
| CN102502547A (zh) * | 2011-10-10 | 2012-06-20 | 浙江兴达活性炭有限公司 | 一种磷酸法生产活性炭中的磷酸除杂工艺 |
| CN102910954B (zh) * | 2012-10-30 | 2014-01-01 | 山东红日阿康化工股份有限公司 | 一种低碳喷浆微晶态水溶肥的生产方法 |
| EA201891738A1 (ru) | 2014-02-11 | 2019-01-31 | Сайтек Индастриз Инк. | Полимеры, содержащие первичный амин, подходящие в качестве ингибиторов накипеобразования |
| WO2016130817A1 (en) | 2015-02-11 | 2016-08-18 | Cytec Industries Inc. | Modified amines useful as scale inhibitors in wet process phosphoric acid production |
| FR3039830B1 (fr) | 2015-08-03 | 2018-09-07 | Ocp Sa | Procede de fabrication d'un engrais a base de phosphate d'ammonium presentant une teneur reduite en cadmium |
| CN107043094A (zh) * | 2017-04-18 | 2017-08-15 | 云南佳贝节能科技有限公司 | 一种浓缩磷酸的加工系统 |
| WO2019071108A2 (en) | 2017-10-08 | 2019-04-11 | Cytec Industries Inc. | COMPOSITIONS AND METHODS FOR REMOVING HEAVY METALS FROM PHOSPHORIC ACID SOURCES |
| CN110526225A (zh) * | 2019-09-29 | 2019-12-03 | 云南佳贝节能科技有限公司 | 一种磷酸脱除重金属的处理工艺 |
| AU2021294256B2 (en) | 2020-06-16 | 2024-01-04 | Yara International Asa | Process for the removal of heavy metals from a phosphoric acid containing composition |
| EP3964477A1 (en) | 2020-09-08 | 2022-03-09 | Yara International ASA | Process for the removal of heavy metals from a phosphoric acid containing composition using an ionic polymeric surfactant |
| EP3964478A1 (en) | 2020-09-08 | 2022-03-09 | Yara International ASA | Process for the removal of heavy metals from a phosphoric acid containing composition |
| EP3964476A1 (en) | 2020-09-08 | 2022-03-09 | Yara International ASA | Process for the removal of heavy metals from a phosphoric acid containing composition using a flocculating agent |
| EP3925710A1 (en) | 2020-06-16 | 2021-12-22 | Yara International ASA | Method for treating solid hazardous heavy metal-containing compositions |
| BR112022021798A2 (pt) | 2020-06-16 | 2022-12-27 | Yara Int Asa | Processo para a remoção de metais pesados de uma composição contendo ácido fosfórico usando um tensoativo polimérico iônico e uso do dito tensoativo na precipitação de metais pesados em uma composição contendo ácido fosfórico |
| WO2021255062A1 (en) | 2020-06-16 | 2021-12-23 | Yara International Asa | Process for the removal of heavy metals from a phosphoric acid containing composition using a flocculating agent |
| BR112023016733A2 (pt) * | 2021-02-25 | 2023-10-31 | Jesa Tech Llc | Método para remover metais pesados na fabricação de ácido fosfórico |
| EP4580987A1 (en) | 2022-09-02 | 2025-07-09 | Cytec Industries Inc. | Reagents and processes for removing heavy metals from phosphoric acid solutions |
| AU2023381612A1 (en) | 2022-11-17 | 2025-05-22 | Cytec Industries Inc. | Compositions and processes for removing heavy metals from phosphoric acid containing streams |
| AU2024303923A1 (en) | 2023-06-15 | 2025-12-04 | Cytec Industries Inc. | Heavy metals removal from phosphoric acid containing streams |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE418845B (sv) * | 1979-05-10 | 1981-06-29 | Boliden Ab | Forfarande for rening av vatprocessfosforsyra |
| DE3127900A1 (de) * | 1981-07-15 | 1983-02-03 | Hoechst Ag, 6000 Frankfurt | Verfahren zur extraktion von schwermetallionen aus waessrigen loesungen |
| DE3134847A1 (de) * | 1981-09-03 | 1983-03-17 | Hoechst Ag, 6000 Frankfurt | "verfahren zur gewinnung cadmium-freier rohphosphorsaeure" |
| DE3202658A1 (de) * | 1982-01-28 | 1983-08-04 | Hoechst Ag, 6230 Frankfurt | Verfahren zur entfernung von schwermetallionen aus nassverfahrensphosphorsaeure |
| DE3212675A1 (de) * | 1982-04-05 | 1983-10-06 | Hoechst Ag | Verfahren zur abtrennung von schwermetallverbindungen aus zwischenprodukten der fabrikation von phosphorduengemitteln |
| DE3218599A1 (de) * | 1982-05-18 | 1983-12-01 | Chemische Fabrik Budenheim Rudolf A. Oetker, 6501 Budenheim | Verfahren zum entfernen von cadmium aus sauren, insbesondere p(pfeil abwaerts)2(pfeil abwaerts)0(pfeil abwaerts)5(pfeil abwaerts)-haltigen loesungen |
| NL8300447A (nl) * | 1983-02-05 | 1984-09-03 | Unie Van Kunstmestfab Bv | Werkwijze voor het verwijderen van zware metalen uit waterige media. |
| FR2557090B1 (fr) * | 1983-12-23 | 1986-04-11 | Pechiney Uranium | Procede de purification de l'acide phosphorique de voie humide par elimination du cadmium |
| DE3434611A1 (de) * | 1984-09-21 | 1986-04-03 | Hoechst Ag, 6230 Frankfurt | Verfahren zur reinigung von phosphorsaeure |
| NL8601101A (nl) * | 1986-04-29 | 1987-11-16 | Unie Van Kunstmestfab Bv | Werkwijze voor het verwijderen van cadmium uit zure, fosfaathoudende waterige media. |
-
1988
- 1988-03-04 NO NO880990A patent/NO164768C/no unknown
-
1989
- 1989-02-24 HU HU892968A patent/HU203502B/hu not_active IP Right Cessation
- 1989-02-24 EP EP89902964A patent/EP0363455A1/en not_active Ceased
- 1989-02-24 WO PCT/NO1989/000016 patent/WO1989008075A1/en not_active Ceased
- 1989-02-24 US US07/435,363 patent/US4986970A/en not_active Expired - Fee Related
- 1989-02-24 FI FI895225A patent/FI895225A0/fi not_active IP Right Cessation
- 1989-02-24 AU AU31994/89A patent/AU3199489A/en not_active Abandoned
- 1989-02-27 MA MA21747A patent/MA21503A1/fr unknown
- 1989-02-27 GR GR890100128A patent/GR890100128A/el unknown
- 1989-02-27 ZA ZA891499A patent/ZA891499B/xx unknown
- 1989-02-28 NZ NZ228157A patent/NZ228157A/xx unknown
- 1989-03-02 JO JO19891563A patent/JO1563B1/en active
- 1989-03-02 IL IL89452A patent/IL89452A0/xx unknown
- 1989-03-03 CS CS138189A patent/CS274579B2/cs unknown
- 1989-03-03 DD DD89326246A patent/DD288147A5/de not_active IP Right Cessation
- 1989-03-03 ES ES8900772A patent/ES2010149A6/es not_active Expired
- 1989-03-03 PL PL1989278054A patent/PL153527B1/pl unknown
- 1989-03-03 YU YU00458/89A patent/YU45889A/xx unknown
- 1989-03-03 TN TNTNSN89023A patent/TNSN89023A1/fr unknown
- 1989-03-03 PT PT89902A patent/PT89902A/pt not_active Application Discontinuation
- 1989-03-04 CN CN89102505A patent/CN1036745A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| HU203502B (en) | 1991-08-28 |
| ES2010149A6 (es) | 1989-10-16 |
| NZ228157A (en) | 1991-02-26 |
| PL153527B1 (en) | 1991-04-30 |
| PT89902A (pt) | 1989-11-10 |
| FI895225A7 (fi) | 1989-11-03 |
| NO164768C (no) | 1990-11-14 |
| NO880990L (no) | 1989-09-05 |
| ZA891499B (en) | 1989-11-29 |
| TNSN89023A1 (fr) | 1991-02-04 |
| US4986970A (en) | 1991-01-22 |
| EP0363455A1 (en) | 1990-04-18 |
| YU45889A (en) | 1990-10-31 |
| NO880990D0 (no) | 1988-03-04 |
| NO164768B (no) | 1990-08-06 |
| MA21503A1 (fr) | 1989-10-01 |
| FI895225A0 (fi) | 1989-11-03 |
| GR890100128A (el) | 1990-01-19 |
| CS274579B2 (en) | 1991-08-13 |
| CN1036745A (zh) | 1989-11-01 |
| PL278054A1 (en) | 1989-11-13 |
| IL89452A0 (en) | 1989-09-10 |
| JO1563B1 (en) | 1989-12-16 |
| HUT52460A (en) | 1990-07-28 |
| AU3199489A (en) | 1989-09-22 |
| WO1989008075A1 (en) | 1989-09-08 |
| CS138189A2 (en) | 1990-12-13 |
| HU892968D0 (en) | 1990-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EPE | Extended patent has ceased | ||
| PV | Patent disclaimer (addendum to changes before extension act) |