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 PDF

Info

Publication number: DD288147A5
Authority: DD; German Democratic Republic
Prior art keywords: heavy metals; phosphoric acid; solution; cadmium; removal
Prior art date: 1988-03-04

Application number

DD89326246A

Other languages

German (de)

English (en)

Inventor

Hans F Th Haraldsen

Original Assignee

��@��@�K�Kk��

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.)

1988-03-04

Filing date

1989-03-03

Publication date

1991-03-21

1989-03-03 Application filed by ��@��@�K�Kk�� filed Critical ��@��@�K�Kk��

1991-03-21 Publication of DD288147A5 publication Critical patent/DD288147A5/de

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)
Mechanical Engineering (AREA)
Materials Engineering (AREA)
Manufacturing & Machinery (AREA)
Life Sciences & Earth Sciences (AREA)
Geochemistry & Mineralogy (AREA)
Geology (AREA)
General Life Sciences & Earth Sciences (AREA)
Environmental & Geological Engineering (AREA)
Inorganic Chemistry (AREA)
General Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Removal Of Specific Substances (AREA)
Manufacture And Refinement Of Metals (AREA)
Extraction Or Liquid Replacement (AREA)
Processing Of Solid Wastes (AREA)
Treatment Of Sludge (AREA)

DD89326246A 1988-03-04 1989-03-03 Verfahren zur entfernung von schwermetallen, insbesondere cadmium, aus phosphorsaeure enthaltenden loesungen DD288147A5 (de)

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 (cs)
EP (1)	EP0363455A1 (cs)
CN (1)	CN1036745A (cs)
AU (1)	AU3199489A (cs)
CS (1)	CS274579B2 (cs)
DD (1)	DD288147A5 (cs)
ES (1)	ES2010149A6 (cs)
FI (1)	FI895225A0 (cs)
GR (1)	GR890100128A (cs)
HU (1)	HU203502B (cs)
IL (1)	IL89452A0 (cs)
JO (1)	JO1563B1 (cs)
MA (1)	MA21503A1 (cs)
NO (1)	NO164768C (cs)
NZ (1)	NZ228157A (cs)
PL (1)	PL153527B1 (cs)
PT (1)	PT89902A (cs)
TN (1)	TNSN89023A1 (cs)
WO (1)	WO1989008075A1 (cs)
YU (1)	YU45889A (cs)
ZA (1)	ZA891499B (cs)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
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
US6027543A (en) *	1996-06-07	2000-02-22	Shiro Yoshizaki	Method for removing a 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
BR122020006607B1 (pt)	2014-02-11	2022-08-09	Cytec Industries Inc	Processo de inibição de incrustações produzidas durante a produção de ácido fosfórico de processo por via úmida
RS66927B1 (sr)	2015-02-11	2025-07-31	Cytec Ind Inc	Upotreba modifikovanih amina inhibitora kamenca u mokrom postupku za proizvodnju fosforne kiseline
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
PL3691992T3 (pl)	2017-10-08	2022-10-24	Cytec Industries Inc.	Sposoby usuwania metali ciężkich z roztworów kwasu fosforowego
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
CN115427164A (zh) *	2020-06-16	2022-12-02	雅苒国际集团	使用絮凝剂从含磷酸组合物中去除重金属的方法
HRP20240928T1 (hr)	2020-06-16	2024-10-11	Yara International Asa	Postupak uklanjanja teških metala iz sastava koji sadrži fosfornu kiselinu korištenjem ionskog polimernog surfaktanta i upotreba navedenog surfaktanta u talošenju teških metala u sastavu koji sadrži fosfornu kiselinu
EP3925710A1 (en) *	2020-06-16	2021-12-22	Yara International ASA	Method for treating solid hazardous heavy metal-containing compositions
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
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
US12545583B2 (en) *	2020-06-16	2026-02-10	Yara International Asa	Process for the removal of heavy metals from a phosphoric acid containing composition
EP3964478A1 (en)	2020-09-08	2022-03-09	Yara International ASA	Process for the removal of heavy metals from a phosphoric acid containing composition
WO2022182909A1 (en) *	2021-02-25	2022-09-01	Jesa Technologies Llc	Method for removing heavy metals in the manufacture of phosphoric acid
IL319056A (en)	2022-09-02	2025-04-01	Cytec Ind Inc	Reagents and processes for removing heavy metals from phosphoric acid solutions
CN120322408A (zh)	2022-11-17	2025-07-15	塞特工业公司	用于从含磷酸的流中去除重金属的组合物和方法
EP4727891A1 (en)	2023-06-15	2026-04-22	Cytec Industries Inc.	Heavy metals removal from phosphoric acid containing streams

Family Cites Families (10)

* Cited by examiner, † Cited by third party
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 US US07/435,363 patent/US4986970A/en not_active Expired - Fee Related
- 1989-02-24 HU HU892968A patent/HU203502B/hu not_active IP Right Cessation
- 1989-02-24 AU AU31994/89A patent/AU3199489A/en not_active Abandoned
- 1989-02-24 WO PCT/NO1989/000016 patent/WO1989008075A1/en not_active Ceased
- 1989-02-24 EP EP89902964A patent/EP0363455A1/en not_active Ceased
- 1989-02-24 FI FI895225A patent/FI895225A0/fi not_active IP Right Cessation
- 1989-02-27 GR GR890100128A patent/GR890100128A/el unknown
- 1989-02-27 MA MA21747A patent/MA21503A1/fr 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 ES ES8900772A patent/ES2010149A6/es not_active Expired
- 1989-03-03 DD DD89326246A patent/DD288147A5/de not_active IP Right Cessation
- 1989-03-03 PT PT89902A patent/PT89902A/pt not_active Application Discontinuation
- 1989-03-03 TN TNTNSN89023A patent/TNSN89023A1/fr unknown
- 1989-03-03 PL PL1989278054A patent/PL153527B1/pl unknown
- 1989-03-03 YU YU00458/89A patent/YU45889A/xx unknown
- 1989-03-03 CS CS138189A patent/CS274579B2/cs unknown
- 1989-03-04 CN CN89102505A patent/CN1036745A/zh active Pending

Also Published As

Publication number	Publication date
NO880990D0 (no)	1988-03-04
AU3199489A (en)	1989-09-22
PL153527B1 (en)	1991-04-30
HU892968D0 (en)	1990-05-28
PL278054A1 (en)	1989-11-13
PT89902A (pt)	1989-11-10
NO880990L (no)	1989-09-05
FI895225A7 (fi)	1989-11-03
CS274579B2 (en)	1991-08-13
FI895225A0 (fi)	1989-11-03
ES2010149A6 (es)	1989-10-16
EP0363455A1 (en)	1990-04-18
JO1563B1 (en)	1989-12-16
GR890100128A (el)	1990-01-19
NO164768B (no)	1990-08-06
WO1989008075A1 (en)	1989-09-08
NO164768C (no)	1990-11-14
NZ228157A (en)	1991-02-26
HUT52460A (en)	1990-07-28
TNSN89023A1 (fr)	1991-02-04
IL89452A0 (en)	1989-09-10
CS138189A2 (en)	1990-12-13
HU203502B (en)	1991-08-28
CN1036745A (zh)	1989-11-01
US4986970A (en)	1991-01-22
YU45889A (en)	1990-10-31
MA21503A1 (fr)	1989-10-01
ZA891499B (en)	1989-11-29

Legal Events

Date	Code	Title	Description
1992-08-27	EPE	Extended patent has ceased
1994-04-14	PV	Patent disclaimer (addendum to changes before extension act)

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