GB1595658A - Process for the recovery of metal containing combined anions selected from (vo3)-(moo4)2-(wo4)2-(fe(cn)6)-and(fe(cn6)4-from waste water or aqueous waste solutions - Google Patents
Process for the recovery of metal containing combined anions selected from (vo3)-(moo4)2-(wo4)2-(fe(cn)6)-and(fe(cn6)4-from waste water or aqueous waste solutions Download PDFInfo
- Publication number
- GB1595658A GB1595658A GB23427/78A GB2342778A GB1595658A GB 1595658 A GB1595658 A GB 1595658A GB 23427/78 A GB23427/78 A GB 23427/78A GB 2342778 A GB2342778 A GB 2342778A GB 1595658 A GB1595658 A GB 1595658A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waste
- recovery
- metal containing
- moo4
- aqueous
- Prior art date
- 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
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (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)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention relates to a process for eliminating inorganic complex anions, containing an element from sub group 5, 6 or 8 of the Periodic Table of the Elements as the central atom, from waste waters or aqueous solutions containing these. The object underlying the invention is to provide a process by which such inorganic complex anions can be removed from waste waters or aqueous solutions avoiding the disadvantages of the known processes, for example the formation of toxic sludge, which poses land filling problems, in precipitation and flocculation processes or the requirement of having to use large amounts of chemicals. The latter also applies to flotation processes. The object is achieved according to the invention in that the anions are selectively separated off by sorption from the waste water or aqueous solution using an easily chemically regenerable aluminium oxide.
Description
PROCESS FOR THE RECOVERY OF METAL CONTAINING COMBINED
ANIONS SELECTED FROM [V03]-, [MoO4]2-, [WO4]2-, [Fe (CN),]3- and [Fe(CN6)]4 FROM WASTE WATERS OR AQUEOUS WASTE SOLUTIONS
(71) We, KERNSFORSCHUNGS
ZENTRUM KARLSRUHE GESELL
SCHAFT MIT BESCHRAENKTER HAF
TUNG, of Postfach 3640, D 7500 Karlsruhe 1, Federal Republic of Germany; a German body corporate, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to a process for the recovery of metal containing combined anions selected from [VO13]-, [MoO4j2-, [WO4]2, [Fe(CN)6]3 and [Fe(CnA"64- from waste waters or aqueous waste solutions.
The purification of waste waters of industrial origin, which. amongst other things contain metal ions or metals, such as waste waters from galvanization plants, was hitherto carried out by means of processes such as chemical.
reduction and precipitation, or flocculation, using organic ion exchangers, electrolysis, electro-plating, ion flotation or absorptin of impurities on active carbon.
The electrolysis and electro-plating processes are generally unsuitable for large quantities of water and are, moreover, relatively costly. Precipitation and flocculation and ion exchange methods are unspecific. Considerable quantities of toxic sludge are formed which raises problems of disposal, or large quantities of chemicals are required which increases the cost of the treatment. The latter also applies to ion Aoatation. Little is as yet known concerning the absorption of inorganic impurities on active carbon. Though the absorption of chromations on active carbon from aqueous solutions has already been described, the sorption of impurities from waste waters is also unspecific and requires, in view of the necessary re-use of the sorption agent for the inorganic impurities, a cumbersome regeneration.
It is an object of the present invention to provide a process by which metal containing combined anions selected from [VO,] -, [MoO,1, [W0412-, [Fe(CN)]3- and {Fe(CN)j4 are recovered from waste waters or aqueous solutions, whilst at the same time, avoiding the disadvantages of the known methods. The recovery agent utilised should be in solid form and since such agent is to be used again after a simple regeneration step, same should permit regeneration.
According to the present invention there is provided a process for the recovery of metal containing combined anions selected from [VO,3] [MoO,]'-, [WO4]2-, [Fe(CN),13- and [Fe(CN)6]4 from waste waters or aqueous waste solutions, in which the anions are selectively separated by sorption from the waste water or aqueous waste solution by using aluminium oxide.
The treatment of waste waters or aqueous waste solutions to be purified by means of the process of the invention may be carried out utilising coarse-grained Awl2 0,3 in solid bed form with treatment of the waste water being effected from above or below or, alternatively with finely-grained Awl203, by way of the floatation technique or the agitator reactor technique. For the regeneration of the sorption agent, the same apparatus may be used as for purification of the waste water or, alternatively, a simple vessel provided with a stirrer may be utilised, whereby the oxide is treated in batches. The regeneration in the said apparatus is preferably carried out in counter-flow.
The recovery results obtained with the process of the invention makes it possible to purify waste waters substantially completely of the said ions. The regeneration of the spent Awl2013 or the recovery of the metals from the Al2O is possible by utilising suitable reagents, viz. sodium lye generally, and complex formers for vanadium and molybdenum.
By this means metal containing ions to be regarded as valuable substances are recovered in a pure form.
The invention will be further described with reference to the following non-limitative example.
EXAMPLE.
50 ml of a solution of substances mentioned in the following Table were shaken, in the quoted original concentrations, with 1 g
Al2O3. The analyses for the elimination of the anions of the said substances, in percentages of the original concentrations and for the maximum load obtained yielded the following values:
TABLE
Substances Original concentr. % Elimin. Max. attained charge K-hexacyanoferrate (Ill) 988 mg K3lFe(CN)6]1 54 2.7% K3[Fe(CN)6] K-hexacyanoferrate ([1) 827 mg K4[Fe(CN)6]1 33 1.9% K4[Fe(CN)6] Sodium molybdate 968 mg Na,MoO4.2H,O/l 99:6 4:8% Na,MoO4 Ammonium vanadate 936 mg NH4VO3/1 98.9 4:6% NH4VO3 Sodium tungstate 732 mg Na2WO4/l 1 96.7 14:1% Na2WO4 WHAT WE CLAIM IS:
1. A process for the recovery of metal containing combined anions selected from [VO3]-, [MoO4]2-, [WO4]2- Fe(CN)633~ and [Fe(CN)4]'t from waste waters or aqueous waste solutions, in which the anions are selectively separated by sorption from the waste water or aqueous waste solution by using aluminium oxide.
2. A process as claimed in claim 1, in which the regeneration of the spent A1,0, or the recovery of the metals from the Al2O3 is effected by chemical means.
3. A process as claimed in claim 2, in which the Al2O3 is regenerated by sodium hydroxide solution or by complex former solutions for vanadium and molybdenum, which remove the metal containing anions from the Al2O3.
4. A process as claimed in claim 1, 2 or 3, substantially as hereinbefore described and exemplified.
5. Metal containing combined anions whenever recovered by a process as claimed in any
Claims (1)
- preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2726193A DE2726193C3 (en) | 1977-06-10 | 1977-06-10 | Process for eliminating compound anions from the group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1595658A true GB1595658A (en) | 1981-08-12 |
Family
ID=6011177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23427/78A Expired GB1595658A (en) | 1977-06-10 | 1978-05-26 | Process for the recovery of metal containing combined anions selected from (vo3)-(moo4)2-(wo4)2-(fe(cn)6)-and(fe(cn6)4-from waste water or aqueous waste solutions |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH635051A5 (en) |
| DE (1) | DE2726193C3 (en) |
| GB (1) | GB1595658A (en) |
| SE (1) | SE7806579L (en) |
-
1977
- 1977-06-10 DE DE2726193A patent/DE2726193C3/en not_active Expired
-
1978
- 1978-05-25 CH CH569078A patent/CH635051A5/en not_active IP Right Cessation
- 1978-05-26 GB GB23427/78A patent/GB1595658A/en not_active Expired
- 1978-06-05 SE SE7806579A patent/SE7806579L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE7806579L (en) | 1978-12-11 |
| DE2726193C3 (en) | 1981-02-26 |
| DE2726193A1 (en) | 1978-12-14 |
| CH635051A5 (en) | 1983-03-15 |
| DE2726193B2 (en) | 1980-06-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |