NO751626L - - Google Patents
Info
- Publication number
- NO751626L NO751626L NO751626A NO751626A NO751626L NO 751626 L NO751626 L NO 751626L NO 751626 A NO751626 A NO 751626A NO 751626 A NO751626 A NO 751626A NO 751626 L NO751626 L NO 751626L
- Authority
- NO
- Norway
- Prior art keywords
- stated
- hydrogen
- waste water
- procedure
- treated
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000002351 wastewater Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000463 material Substances 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
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 ferrous metal compounds Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002730 mercury Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/467—Foam spreading or levelling devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/588—Moulds with means for venting, e.g. releasing foaming gas
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/006—Degassing moulding material or draining off gas during moulding
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
- Catalysts (AREA)
Description
Fremgangsmåte for rensing av spillvann. Procedure for cleaning waste water.
Foreliggende oppfinnelse vedrører en fremgangsmåte for rensingThe present invention relates to a method for cleaning
av spillvann som inneholder krom, kvikksølv og andre turigmetall-forbindelser, og det særegne ved fremgangsmåten i henhold til oppfinnelsen er at spillvannet bringes i' kontakt med et element valgt fra de elementer som er mindre edle enn hydrogen* ;I>et er kjent fra vitenskapelige publikasjoner at det er foreslått en fremgangsmåte for reduksjon av.:Cr<+>^ til Cr<+>^ hvor det gjøres bruk a<y>metallisk jern. Denne fremgangsmåte har imidlertid ikke funnet industriell anvendelse i scirlig grad'fremfor alt på grunn av det høye forbruk av jern, som forer til store mengder slam som må fjernes og et forbruk.av fellingsmidde! (CatOH^ eller NaOH) høyere enn dem som opptrer ved de vanlige prosesser (SO^ og bisulfit) ;På den annen side er 'det klart at hvis reaksjonen foregikk med et Fe-f or bruk tilsvarende det teoretiske, ville prosessen være fordelaktig fra et økonomisk synspunkt. ;Det er nå funnet at hvis pH i den oppløsning som skal behandles og den ltneare hastighet derav i det reduserende system reguleres på passende måte, er det mulig å gjennomføre fremgangsmåten med et jernforbruk meget nær den teoretiske verdi uten samtidig opptreden av passiveringsfenomener for metallet, idet disse fenomener skyldes dannelsen av-en. passivert film på raetalloverflaten som i løpet av noen tid fullstendig deaktiverer metallet. Hvis pH i avløpet fra det reduserende system holdes under den verdi ved hvilken Fe felles ut som hydroksyd, unngås disse fenomener fullstendig. ;Mer spesielt gjennomfores f reragangsmåten i henhold til oppfinnelsen ved å la det vann som skal behandles stromme gjennom en eller flere kolonner fylt med elementet som er mindre edelt enn hydrogen, idet det element foreligger i form av korn, kuler, små stenger, spon. eller hvilken som helst form som kan tilpasses s størrelsen av selve kolonnene. ;Den reaksjon som foregår hår vannet strømmer gjennom kolonnene består i oksydasjon av elementet i 0-tilstanden og samtidig reduksjon av det forurensende material til lavere aksydasjohs-tilstander.eller endog til metallisk tilstand. Hvis f.eks» et ;ion av et. flerverdig metall hører til <>n anionisk gruppe, forer;. fremgangsmåten til dannelse av et salt av det samme metall i.en lavere valenstilstandj- som lett kan fjernes ved kjent teknikk. ;I motsetning til dette, hvis vannet inneholder et edelmetallsalt frembringer fremgangsmåten det tilsvarende metall. ;Følgelig reduseres kromater til troverdige kromsalter,. og kobber-eller kvikksølvsalter reduseres til henhv. metallisk kobber eller kvikksølv. ' De reaksjoner som foregår i noen av de ovennevnte tilfeller kan gjengis Ved de følgende reaksjonsskjemaer, hvori Fe anvendes som elektropositivt element: ; for kromater, mens reaksjonsskjemaet for edelmetaller blir nFe + 2 Me<n+>«*n Fe<2+>+ 2 Me of waste water containing chromium, mercury and other ferrous metal compounds, and the distinctive feature of the method according to the invention is that the waste water is brought into contact with an element selected from those elements which are less noble than hydrogen*; it is known from scientific publications that a method has been proposed for the reduction of Cr<+>^ to Cr<+>^ where metallic iron is used. However, this method has not found industrial application to a great extent, above all because of the high consumption of iron, which leads to large quantities of sludge that must be removed and a consumption of precipitation mite! (CatOH^ or NaOH) higher than those occurring in the usual processes (SO^ and bisulphite); On the other hand, it is clear that if the reaction took place with an Fe-f or use corresponding to the theoretical, the process would be advantageous from an economic point of view. It has now been found that if the pH of the solution to be treated and the lower rate thereof in the reducing system are appropriately regulated, it is possible to carry out the process with an iron consumption very close to the theoretical value without simultaneous occurrence of passivation phenomena for the metal, since these phenomena are due to the formation of a passivated film on the metal surface which completely deactivates the metal over a period of time. If the pH in the effluent from the reducing system is kept below the value at which Fe is precipitated as hydroxide, these phenomena are completely avoided. More specifically, the process according to the invention is carried out by allowing the water to be treated to flow through one or more columns filled with the element that is less noble than hydrogen, the element being in the form of grains, spheres, small rods, shavings. or any shape that can be adapted to the size of the columns themselves. The reaction that takes place when the water flows through the columns consists in oxidation of the element in the 0 state and at the same time reduction of the polluting material to lower oxidasjohs states.or even to the metallic state. If, for example, an ion of an polyvalent metal belongs <>n anionic group, forer;. the method for forming a salt of the same metal in a lower valence state which can be easily removed by known techniques. In contrast, if the water contains a noble metal salt, the method produces the corresponding metal. Consequently, chromates are reduced to reliable chromium salts. and copper or mercury salts are reduced to metallic copper or mercury. The reactions that take place in some of the above cases can be reproduced by the following reaction schemes, in which Fe is used as an electropositive element: ; for chromates, while the reaction scheme for noble metals becomes nFe + 2 Me<n+>«*n Fe<2+>+ 2 Me
'." Me er her edelmetallet, f .eks. som nevnt kobber eller kvikksøl?/, og n er oksydasjonstilstanden av dette. '." Me is here the noble metal, e.g. as mentioned copper or mercury?/, and n is the oxidation state of this.
Reaksjonen foregår uten noen energitilførsel utenfra, ved pH lavere eller lik 3. The reaction takes place without any external energy supply, at a pH lower than or equal to 3.
Renseprosessen i henhold til den foreliggende oppfinnelse kan gjennomføres ved en hoy gjennomstrømning, og et spesielt og fordelaktig trekk ved fremgangsmåten i henhold til oppfinnelsen består i>å arbeide ved de høyest mulige gjennomstrømninger i avhengighet av pH og konsentrasjonen av det forurensende material. Med dq samme mengder av redusert forurensende material vil økning av gjennomstrømningen føre til at forbruket, .av det elektropositive element nærmer seg sterkt den teoretiske verdi0 The cleaning process according to the present invention can be carried out at a high flow rate, and a special and advantageous feature of the method according to the invention consists in working at the highest possible flow rates depending on the pH and the concentration of the polluting material. With the same amount of reduced polluting material, an increase in the flow will cause the consumption of the electropositive element to approach strongly the theoretical value0
Oppfinnelsen vil lettere bli foc±ått ved hjelp av de følgende eksemi„élvise utf ørelsesf ormer. The invention will be more easily understood by means of the following exemplary embodiments.
EKSEMPEL 1 EXAMPLE 1
pH-innvirkningpH impact
En kolonne med diameter .2.7 cm ble fylt med sylindriske korn avA column of diameter .2.7 cm was filled with cylindrical grains of
Fe (<7 = 4 mm, høyde «= 6 mm), og oppløsninger inneholdende Cr^<+>ble sendt gjennom kolonnen ved forskjellige pH-verdier. Fe (<7 = 4 mm, height «= 6 mm), and solutions containing Cr^<+> were passed through the column at different pH values.
Alle prøver ble gjennomført ved konstant gjennorns tr on Ci ing ogAll tests were carried out at constant gjennorn's tr on Ci ing and
de oppnådde resultater er oppført i tabell 1. the results obtained are listed in table 1.
EKSEMPEL"- 2EXAMPLE" - 2
Innvirkning av gjennomstrømningen (volumhastigheten).Impact of the flow rate (volume rate).
Det ble gjennomført noen forsøk i samme kolonne.som i det foregående eksempel ved anvendelse av det samme fyllevolum, mens pH ble holdt konstant og gjennomstrømningen ble endret. Some experiments were carried out in the same column as in the previous example using the same loading volume, while the pH was kept constant and the flow rate was changed.
Resultatene er oppført.i tabell 2.The results are listed in Table 2.
EKSEMPEL 3 EXAMPLE 3
Innvirkning av lineær strømhingshastighet. Effect of linear current slew rate.
320 cm 3 Fe ble i rekkefølge innført i tre kolonner med.forskjellige diametre og en oppløsning inneholdende Cr 6+ ble. sendt derigjennom ved konstant volumhastighet og pH slik at den samme kontakt-tid 320 cm 3 Fe was successively introduced into three columns with different diameters and a solution containing Cr 6+ was. sent through it at constant volume rate and pH so that the same contact time
mellom oppløsning og fyllgods ble oppnådd med forskjellige lineære hastigheter <» between solution and filler was achieved with different linear velocities <»
Resultatene er oppført i tabell 3.The results are listed in Table 3.
EKSEMPEL 4 EXAMPLE 4
Innvirkning av kolonnediameteren. Influence of the column diameter.
Det ble anvendt kolonner med forskjellige diametre, Det var mulig å påvise, som vist i tabell 4, under den samme tilførselsstrøm, at 6+ Columns with different diameters were used. It was possible to demonstrate, as shown in Table 4, under the same feed flow, that 6+
den mengde Fe som var nødvendig for total reduksjon av Cr til Cr^+ nedsettes ved nedsettelse av diameteren av selve kolonnen. the amount of Fe that was necessary for total reduction of Cr to Cr^+ is reduced by reducing the diameter of the column itself.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT22396/74A IT1010486B (en) | 1974-05-08 | 1974-05-08 | PROCEDURE FOR THE PURIFICATION OF WASTE WATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO751626L true NO751626L (en) | 1975-11-11 |
Family
ID=11195718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO751626A NO751626L (en) | 1974-05-08 | 1975-05-06 |
Country Status (23)
| Country | Link |
|---|---|
| JP (1) | JPS50152557A (en) |
| AT (2) | AT346253B (en) |
| BE (1) | BE828570A (en) |
| CH (1) | CH617642A5 (en) |
| CS (1) | CS202546B2 (en) |
| DD (1) | DD118051A5 (en) |
| DE (1) | DE2520531A1 (en) |
| DK (1) | DK196775A (en) |
| ES (1) | ES437875A1 (en) |
| FI (1) | FI751142A7 (en) |
| FR (1) | FR2270209B1 (en) |
| GB (1) | GB1474145A (en) |
| IE (1) | IE41336B1 (en) |
| IL (1) | IL47073A (en) |
| IT (1) | IT1010486B (en) |
| LU (1) | LU72427A1 (en) |
| NL (1) | NL7505514A (en) |
| NO (1) | NO751626L (en) |
| PL (1) | PL111038B1 (en) |
| RO (1) | RO69366A (en) |
| SE (1) | SE7505290L (en) |
| TR (1) | TR19213A (en) |
| YU (1) | YU103975A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2613128C2 (en) * | 1976-03-27 | 1982-03-04 | Hoechst Ag, 6000 Frankfurt | Process for reducing the mercury content of industrial wastewater |
| IT8348501A0 (en) * | 1982-06-16 | 1983-06-14 | Occidental Chem Co | APPARATUS AND PROCEDURE FOR REMOVING COPPER IONS FROM AN AQUEOUS SOLUTION |
| DE3411228C1 (en) * | 1984-03-27 | 1985-05-30 | Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf | Process for the environmentally friendly purification of photographic wash water from film processing machines and apparatus for carrying out the process |
| DE4217987A1 (en) * | 1992-05-30 | 1993-12-02 | Battelle Institut E V | Removal and recovery of heavy metals from earth, sludges and waterways - by amalgamation and sedimentation of esp. mercury@, nickel@ and cobalt@ and their cpds., by addn. of powered zinc@ or aluminium@ |
| DK0660804T3 (en) * | 1992-09-18 | 1997-09-01 | Krueger As I | Process for purifying metal-containing aqueous media and process for preparing an adsorbent. |
| DE102007045337B4 (en) * | 2007-09-22 | 2021-01-07 | Bayerische Motoren Werke Aktiengesellschaft | Procedure for protection against dust containing chromium (VI) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2177656B1 (en) * | 1972-03-31 | 1979-02-16 | Lewandowski Raymond |
-
1974
- 1974-05-08 IT IT22396/74A patent/IT1010486B/en active
-
1975
- 1975-04-11 IL IL47073A patent/IL47073A/en unknown
- 1975-04-17 FI FI751142A patent/FI751142A7/fi not_active Application Discontinuation
- 1975-04-23 YU YU01039/75A patent/YU103975A/en unknown
- 1975-04-25 GB GB1736975A patent/GB1474145A/en not_active Expired
- 1975-04-28 IE IE946/75A patent/IE41336B1/en unknown
- 1975-04-28 CH CH541075A patent/CH617642A5/en not_active IP Right Cessation
- 1975-04-29 BE BE155938A patent/BE828570A/en unknown
- 1975-04-29 TR TR19213A patent/TR19213A/en unknown
- 1975-05-05 CS CS753094A patent/CS202546B2/en unknown
- 1975-05-05 RO RO7582142A patent/RO69366A/en unknown
- 1975-05-05 PL PL1975180173A patent/PL111038B1/en unknown
- 1975-05-05 DK DK196775A patent/DK196775A/en unknown
- 1975-05-06 SE SE7505290A patent/SE7505290L/en unknown
- 1975-05-06 DD DD185871A patent/DD118051A5/xx unknown
- 1975-05-06 FR FR7514128A patent/FR2270209B1/fr not_active Expired
- 1975-05-06 NO NO751626A patent/NO751626L/no unknown
- 1975-05-07 LU LU72427A patent/LU72427A1/xx unknown
- 1975-05-07 DE DE19752520531 patent/DE2520531A1/en active Pending
- 1975-05-07 AT AT351775A patent/AT346253B/en not_active IP Right Cessation
- 1975-05-07 ES ES437875A patent/ES437875A1/en not_active Expired
- 1975-05-08 JP JP50054324A patent/JPS50152557A/ja active Pending
- 1975-05-09 NL NL7505514A patent/NL7505514A/en not_active Application Discontinuation
-
1976
- 1976-05-28 AT AT390876A patent/AT351775B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2270209B1 (en) | 1980-04-18 |
| AU8013875A (en) | 1976-10-21 |
| PL111038B1 (en) | 1980-08-30 |
| GB1474145A (en) | 1977-05-18 |
| IE41336L (en) | 1975-11-08 |
| CH617642A5 (en) | 1980-06-13 |
| DK196775A (en) | 1975-11-09 |
| ATA390876A (en) | 1979-01-15 |
| AT346253B (en) | 1978-11-10 |
| DE2520531A1 (en) | 1975-11-13 |
| AT351775B (en) | 1978-02-15 |
| NL7505514A (en) | 1975-11-11 |
| RO69366A (en) | 1981-07-30 |
| CS202546B2 (en) | 1981-01-30 |
| ES437875A1 (en) | 1977-01-01 |
| FR2270209A1 (en) | 1975-12-05 |
| IL47073A0 (en) | 1975-06-25 |
| YU103975A (en) | 1982-02-28 |
| BE828570A (en) | 1975-08-18 |
| TR19213A (en) | 1978-06-07 |
| LU72427A1 (en) | 1975-08-26 |
| SE7505290L (en) | 1975-11-10 |
| DD118051A5 (en) | 1976-02-12 |
| IE41336B1 (en) | 1979-12-05 |
| ATA351775A (en) | 1978-02-15 |
| JPS50152557A (en) | 1975-12-08 |
| IL47073A (en) | 1978-07-31 |
| IT1010486B (en) | 1977-01-10 |
| FI751142A7 (en) | 1975-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3761369A (en) | Process for the electrolytic reclamation of spent etching fluids | |
| Zakroczymski et al. | Effect of promoters on the permeation of electrolytic hydrogen through steel | |
| EP0075882B1 (en) | Process for regenerating cleaning fluid | |
| CN115652114B (en) | Recycling process of thallium in thallium-containing solution | |
| WO1990011674A1 (en) | A process for removing selenium from wastewater effluent | |
| US3493498A (en) | Ion-exchange process | |
| GB1490926A (en) | Removal of hexavalent chromate trivalent chromium molybdate and zinc ions from water | |
| US5254153A (en) | Cyanide recycling process | |
| US3802910A (en) | Recovery of mercury from mercurous bearing liquids | |
| US4664810A (en) | Method of separating heavy metals from complex-forming substances of aminocarboxylic acid type, or salts thereof in aqueous solutions | |
| Mills et al. | Oxygen removal from water by ammine exchange resins | |
| US4526662A (en) | Processes for the recovery of cyanide from aqueous thiocyanate solutions and detoxication of aqueous thiocyanate solutions | |
| US3876537A (en) | Method of insolubilizing demineralizer and cooling tower blowdown wastes | |
| US4151079A (en) | Regeneration of ion exchange resins | |
| US4116783A (en) | Method for recovering variable-valency elements and purifying sewage waters | |
| CN102092874A (en) | Equipment for recycling stainless steel neutral salt waste electrolyte | |
| Costa | Regeneration of Chromic Acid Solutions by Cation Exchange | |
| US2293066A (en) | Cyanidation method | |
| NO121070B (en) | ||
| US4402759A (en) | Process for inhibiting the corrosion of a metal installation in contact with an acid bath | |
| PL111038B1 (en) | Method of treatment of sewages containing heavy metals compounds | |
| Higgins | Ion exchange. Present and future use | |
| CN106630268A (en) | Recycling method of nickel in stainless steel | |
| Solt | Phosphorus in industrial water | |
| JPS6019087A (en) | Removal of heavy metal in aqueous iron salt solution |