CA1095257A - Recovery of vanadate compounds from aqueous solutions - Google Patents
Recovery of vanadate compounds from aqueous solutionsInfo
- Publication number
- CA1095257A CA1095257A CA286,010A CA286010A CA1095257A CA 1095257 A CA1095257 A CA 1095257A CA 286010 A CA286010 A CA 286010A CA 1095257 A CA1095257 A CA 1095257A
- Authority
- CA
- Canada
- Prior art keywords
- vanadate
- solution
- aqueous
- particles
- recovery
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G31/00—Compounds of vanadium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
RECOVERY OF VANADATE COMPOUNDS
FROM AQUEOUS SOLUTIONS
ABSTRACT OF THE INVENTION
Vanadium values are recovered from an aqueous vanadate solution by atomizing the solution and heating the fine droplets to vaporize the water constituent and form vanadate particles which are quickly cooled.
S P E C I F I C A T I O N
FROM AQUEOUS SOLUTIONS
ABSTRACT OF THE INVENTION
Vanadium values are recovered from an aqueous vanadate solution by atomizing the solution and heating the fine droplets to vaporize the water constituent and form vanadate particles which are quickly cooled.
S P E C I F I C A T I O N
Description
The present invention is directed to the recovery of vanadium values from aqueous vanadate solutions.
I~ is a common industrial prac~ice to process vanadiurn ores to obtain aqueous vanadate solutions From which the vanadium values are recovered in the form of an industrially usable solid vanadate product. The conventional prior practice for recovering solid vanadate product involves crystallization techniques which result in a contaminated liquid effluent due to relatively low solids recovery. In the case of ammonium vanadate the effluent is contaminated with ammonia.
It is an object oF the present invention to provide a process for recovering vanadium values from aqueous vanadate solutions which provide high recoveries of vanadium and avoids the formation of a contaminated liquid effluent.
Other objects will be apparent from the following description and claims taken in conjunction with the drawing wherein Figure I shows schematically a process arrangement for the practice of the present invention.
I~ is a common industrial prac~ice to process vanadiurn ores to obtain aqueous vanadate solutions From which the vanadium values are recovered in the form of an industrially usable solid vanadate product. The conventional prior practice for recovering solid vanadate product involves crystallization techniques which result in a contaminated liquid effluent due to relatively low solids recovery. In the case of ammonium vanadate the effluent is contaminated with ammonia.
It is an object oF the present invention to provide a process for recovering vanadium values from aqueous vanadate solutions which provide high recoveries of vanadium and avoids the formation of a contaminated liquid effluent.
Other objects will be apparent from the following description and claims taken in conjunction with the drawing wherein Figure I shows schematically a process arrangement for the practice of the present invention.
-2-~L~9~; 2at;i7 A method in accordance with the present invention for recovering a solid vanadate compound from an aqueous solution comprises atomizing an aqueous vanadate solution to`provide fine droplets of vanadate solution, introducing the fine droplets of solution into a heated zone which is at a temperature in the range of about 300 to 750C~
preferably 400 to 550C to vaporize the aqu ous constituent of the droplets and provide fine sized solid vanadate particles, and rapidly cooling the fine sized particles to a temperature below about 250C, preferably below about 150C.
The present invention will be more fully under-stood with reFerence to the drawing which shows an aqueous solution oF vanadate compound introduced to conduit 10.
The solution passes through a nozzle 20 and is thereby atomized into a fine spray of fine droplets of vanadate solution.
The fine droplets of solution are subjected tu a high temperature in zone 30 of chamber 40, i.e. in the range of 300 to 650C. This temperature is established by hot gases entering chamber 40 at inlet conduit 50.
The solution droplets are rapidly vaporized in zone 30, i.e. the waterconSt;tuent is vaporized, and very small particles of solid vanadate material is swept into zone 60 by the gases from conduit 50. Zone 60 is at a temperature of less than about 250C which can be established by coordinating the design of chamber 40 with the cooling of the gases within chamber 40 due to vaporization oF the liquid droplets. Alternatively, the lower portion of chamber 40 can be conventionally water-cooled. By rapidly moving the vanadate particles into cooler zone 60, decomposition of the small vanadate particles which are on the order of 0.5 to 100 microns is avoided.
The thus produced dry, fine vanadate particles in the form of a powder are swept from chamber 40 by the gases from inlet 50 to a conventional cyclone arrangement 70 from which vanadate product is recovered at collector 80. Very fine dust-like particles are re-covered at conventional filter unit 90 and the exhaust gas and vapor are conventionally transFerred via blower lO0 to scrubber llO.
The following example will further illustrate the present invention.
EXAMPLE
A water solution of ammonium decavanadate,(NH4)6 V1028~ in the amount, in 2 liter amounts, was fed through a centriFugal wheel atomizing nozzle at different rates, into a vertica1 spray drying chamber of the type shown in the drawing (steel shell .064in.thick, 30 in. cylindrical section 30 in. diameter, 24 in. conical end section).
The drying chamber was heated by combustion gases from a natural gas-oxygen mixture which passed through the chamber from top to bottom as shown in the drawing. The gas temper-ature was measured at the inlet and outlet of the chamber.
The vanadium content of ~he vanadate solution, measured as 25~
~25 was 7.91% by weight. The results of various tests are shown in the following table.
TABLE I
Ammonium Deca-vanadate Soln. Heating Chamber Chamber Ammonium Deca-Flow Rate. Gas Inlet Outlet vanadate Flow(CFM) Temp.
~S4 45 1.4 368 127 83%
333 47 1.6 480 128 91%
4~0 42 1.8 538 128 88%
H3 was not de~ec~ed in the gas exiting the chamber.In the practice of the present invention various conventional atomizer devices which provide a mist-like spray of liquid drops about 2-500 microns can be employed such as described at pp 839-840 of the "Chemical Engineers Handbook," 3rd Edition, McGraw-Hill. Also, vanadate solutions other than ammonium decavanadate can be processed such as :
Ammonium Metavanadate Sodium Decavanadate Sodium Metavanadate Potassium Deca~anadate Potassium Me~avanadate The recovered vanadate product can be conventionally heat decomposed to yield the industrially useful product V205.
Heating and gas flow arrangements other than that shown in the drawing can be usPd in the practice of the present invention such as Pxterior heating and horizontal drying chambers and countercurrent gas flow techniques known to the art.
, ., ;
preferably 400 to 550C to vaporize the aqu ous constituent of the droplets and provide fine sized solid vanadate particles, and rapidly cooling the fine sized particles to a temperature below about 250C, preferably below about 150C.
The present invention will be more fully under-stood with reFerence to the drawing which shows an aqueous solution oF vanadate compound introduced to conduit 10.
The solution passes through a nozzle 20 and is thereby atomized into a fine spray of fine droplets of vanadate solution.
The fine droplets of solution are subjected tu a high temperature in zone 30 of chamber 40, i.e. in the range of 300 to 650C. This temperature is established by hot gases entering chamber 40 at inlet conduit 50.
The solution droplets are rapidly vaporized in zone 30, i.e. the waterconSt;tuent is vaporized, and very small particles of solid vanadate material is swept into zone 60 by the gases from conduit 50. Zone 60 is at a temperature of less than about 250C which can be established by coordinating the design of chamber 40 with the cooling of the gases within chamber 40 due to vaporization oF the liquid droplets. Alternatively, the lower portion of chamber 40 can be conventionally water-cooled. By rapidly moving the vanadate particles into cooler zone 60, decomposition of the small vanadate particles which are on the order of 0.5 to 100 microns is avoided.
The thus produced dry, fine vanadate particles in the form of a powder are swept from chamber 40 by the gases from inlet 50 to a conventional cyclone arrangement 70 from which vanadate product is recovered at collector 80. Very fine dust-like particles are re-covered at conventional filter unit 90 and the exhaust gas and vapor are conventionally transFerred via blower lO0 to scrubber llO.
The following example will further illustrate the present invention.
EXAMPLE
A water solution of ammonium decavanadate,(NH4)6 V1028~ in the amount, in 2 liter amounts, was fed through a centriFugal wheel atomizing nozzle at different rates, into a vertica1 spray drying chamber of the type shown in the drawing (steel shell .064in.thick, 30 in. cylindrical section 30 in. diameter, 24 in. conical end section).
The drying chamber was heated by combustion gases from a natural gas-oxygen mixture which passed through the chamber from top to bottom as shown in the drawing. The gas temper-ature was measured at the inlet and outlet of the chamber.
The vanadium content of ~he vanadate solution, measured as 25~
~25 was 7.91% by weight. The results of various tests are shown in the following table.
TABLE I
Ammonium Deca-vanadate Soln. Heating Chamber Chamber Ammonium Deca-Flow Rate. Gas Inlet Outlet vanadate Flow(CFM) Temp.
~S4 45 1.4 368 127 83%
333 47 1.6 480 128 91%
4~0 42 1.8 538 128 88%
H3 was not de~ec~ed in the gas exiting the chamber.In the practice of the present invention various conventional atomizer devices which provide a mist-like spray of liquid drops about 2-500 microns can be employed such as described at pp 839-840 of the "Chemical Engineers Handbook," 3rd Edition, McGraw-Hill. Also, vanadate solutions other than ammonium decavanadate can be processed such as :
Ammonium Metavanadate Sodium Decavanadate Sodium Metavanadate Potassium Deca~anadate Potassium Me~avanadate The recovered vanadate product can be conventionally heat decomposed to yield the industrially useful product V205.
Heating and gas flow arrangements other than that shown in the drawing can be usPd in the practice of the present invention such as Pxterior heating and horizontal drying chambers and countercurrent gas flow techniques known to the art.
, ., ;
Claims (2)
1. Process for recovering a solid vanadate compound from an aqueous solution thereof which comprises (i) atomizing an aqueous vanadate solution to provide fine droplets of vanadate solution (ii) introducing said fine droplets of solution into a heated zone which is at a temperature in the range of about 300°C to 750°C to vaporize the aqueous constituent of said droplets and provide fine sized vanadate particles and (iii) rapidly cooling the thus provided fine sized vanadate particles to a temperature below about 250°C
2. Process in accordance with Claim 1 wherein the temperature in the heated zone is from about 400 to 550°C. and the fine sized vanadate particles are cooled to below about 150°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72413576A | 1976-09-17 | 1976-09-17 | |
| US724,135 | 1976-09-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1095257A true CA1095257A (en) | 1981-02-10 |
Family
ID=24909166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA286,010A Expired CA1095257A (en) | 1976-09-17 | 1977-09-02 | Recovery of vanadate compounds from aqueous solutions |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5337600A (en) |
| AT (1) | AT365544B (en) |
| CA (1) | CA1095257A (en) |
| DE (1) | DE2736692C2 (en) |
| FI (1) | FI63205C (en) |
| FR (1) | FR2364857A1 (en) |
| LU (1) | LU78131A1 (en) |
| NO (1) | NO152692C (en) |
| ZA (1) | ZA774785B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2671067A1 (en) * | 1990-12-28 | 1992-07-03 | Rhone Poulenc Chimie | COMPOUNDS, IN PARTICULAR BASED ON TITANIUM, VANADIUM, NIOBIUM, REDUCED, PARTICULARLY OF THE TYPE TITANITES AND THEIR PREPARATION. |
| US5326545A (en) * | 1993-03-30 | 1994-07-05 | Valence Technology, Inc. | Method of making lithium battery electrode compositions |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3895994A (en) * | 1974-02-15 | 1975-07-22 | Kenji Saguchi | Spray dryer |
-
1977
- 1977-08-08 ZA ZA00774785A patent/ZA774785B/en unknown
- 1977-08-16 DE DE2736692A patent/DE2736692C2/en not_active Expired
- 1977-09-02 CA CA286,010A patent/CA1095257A/en not_active Expired
- 1977-09-16 NO NO773195A patent/NO152692C/en unknown
- 1977-09-16 AT AT0666277A patent/AT365544B/en not_active IP Right Cessation
- 1977-09-16 JP JP11149877A patent/JPS5337600A/en active Pending
- 1977-09-16 LU LU78131A patent/LU78131A1/xx unknown
- 1977-09-16 FR FR7728017A patent/FR2364857A1/en active Granted
- 1977-09-16 FI FI772735A patent/FI63205C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ZA774785B (en) | 1978-06-28 |
| FI63205B (en) | 1983-01-31 |
| NO773195L (en) | 1978-03-20 |
| DE2736692A1 (en) | 1978-03-30 |
| JPS5337600A (en) | 1978-04-06 |
| AT365544B (en) | 1982-01-25 |
| NO152692B (en) | 1985-07-29 |
| FI63205C (en) | 1983-05-10 |
| ATA666277A (en) | 1981-06-15 |
| NO152692C (en) | 1985-11-06 |
| DE2736692C2 (en) | 1984-05-10 |
| FI772735A (en) | 1978-03-18 |
| FR2364857A1 (en) | 1978-04-14 |
| LU78131A1 (en) | 1978-06-01 |
| FR2364857B1 (en) | 1983-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |