Vanadium extraction system for phosphorus removal vanadium slag and ammonium metavanadate raffinate
A vanadium extraction system that utilizes multi-stage solid-liquid separation and chemical reactions to remove phosphorus from vanadium slag and ammonium metavanadate residue solves the problem of low vanadium recovery efficiency, achieving high-efficiency vanadium recovery and reducing costs.
Patent Information
- Application Number
- CN202520593406.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-31
AI Technical Summary
In existing technologies, the vanadium recovery efficiency in phosphorus removal slag and ammonium metavanadate residue is not high, resulting in resource waste and high costs. Improper ammonia nitrogen treatment may cause environmental pollution.
A vanadium extraction system for removing phosphorus and vanadium slag and ammonium metavanadate residue is adopted, including a first dissolving tank, a first separator, a buffer tank, a second dissolving tank, and a second separator. Through multi-stage solid-liquid separation and chemical reaction, vanadium is efficiently recovered.
This method enables efficient recovery of vanadium from phosphorus removal slag and ammonium metavanadate residue, improving vanadium extraction efficiency, saving recovery costs, and reducing water treatment costs.
Smart Images
Figure CN223921495U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vanadium extraction technology from vanadium slag, and in particular to a vanadium extraction system for phosphorus-removed vanadium slag and ammonium metavanadate residue. Background Technology
[0002] The vanadium extraction technology using sodium salts from vanadium slag is a hydrometallurgical process for extracting vanadium from vanadium slag. The vanadium slag is mixed with sodium salts (such as sodium carbonate or sodium sulfate) and roasted at high temperature to convert vanadium into water-soluble sodium vanadate. The roasted product is then leached with water or a dilute alkaline solution, allowing the sodium vanadate to enter the solution. Impurities are then removed through filtration, precipitation, and other methods to obtain a pure vanadium-containing solution.
[0003] Regarding the dephosphorization slag and ammonium metavanadate residue, the dephosphorization slag contains approximately 10% vanadium by mass, indicating a high vanadium content. Reusing it in the sodium salt roasting process is lengthy and costly, and the vanadium recovery efficiency is unsatisfactory. The ammonium metavanadate precipitate residue has a vanadium concentration of 2-3 g / L and an ammonia nitrogen concentration of 12-20 g / L, exhibiting weak alkalinity. This residue requires a water treatment process to recover vanadium and remove ammonia nitrogen, resulting in high wastewater treatment costs. Therefore, according to existing vanadium slag sodium salt extraction technology, vanadium in the dephosphorization slag and ammonium metavanadate residue is not efficiently recovered, leading to resource waste. Improper treatment of the ammonia nitrogen in the residue may also cause environmental pollution.
[0004] Therefore, existing technologies still need improvement. Utility Model Content
[0005] One of the technical problems that this invention aims to solve is how to efficiently recover vanadium from phosphorus removal slag and ammonium metavanadate residue, thereby saving on recovery costs.
[0006] To address the aforementioned technical problems, some embodiments of this utility model disclose a vanadium extraction system for phosphorus-removed vanadium slag and ammonium metavanadate residue, comprising:
[0007] The first dissolving tank is used to dissolve the ammonium metavanadate residue and the phosphorus-removing vanadium slag solution, so that the two react chemically to obtain phosphorus-removing vanadium slag slurry.
[0008] A first separator connected to the first dissolving tank includes a first outlet and a second outlet. The first separator is used to separate the phosphorus-vanadium slag slurry into solid and liquid components to obtain a first vanadium-containing filtrate and a first residue, which are output from the first outlet and the second outlet, respectively.
[0009] The buffer tank connected to the first outlet;
[0010] The second dissolving tank, connected to the second outlet, is used for pulping and washing the first residue to obtain a residue slurry;
[0011] The second separator, connected to the outlet of the second dissolving tank, includes a third outlet and a fourth outlet. The third outlet is connected to the buffer tank. The second separator is used to press the residue slurry and separate it into a second vanadium-containing filtrate and a second residue, which are output from the third outlet and the fourth outlet, respectively.
[0012] In some embodiments, the system further includes a vanadium recovery device connected to the outlet of the buffer tank and used to treat the first vanadium-containing filtrate and / or the second vanadium-containing filtrate by vanadium precipitation to obtain ammonium polyvanadate.
[0013] In some embodiments, the vanadium recovery apparatus includes a precipitation reactor.
[0014] In some embodiments, the system further includes a supply device connected to the first dissolving tank and used to input the dissolved phosphorus-removing vanadium slag solution into the first dissolving tank.
[0015] In some embodiments, the supply device includes a belt conveyor.
[0016] In some embodiments, the system further includes an ammonia absorption device, which is installed between the first separator and the buffer tank and connected to both. The ammonia absorption device is used to dilute the ammonia generated in the first dissolving tank to obtain an ammonia-containing solution, which is then fed into the buffer tank.
[0017] In some embodiments, the ammonia absorption device includes an alkaline spray tower.
[0018] In some embodiments, the first melting tank includes a reaction vessel with stirring and heating functions.
[0019] In some embodiments, the second melting tank includes a reaction vessel with stirring and heating functions.
[0020] In some embodiments, the first separator and the second separator each include an automatic chamber filter press.
[0021] By adopting the above technical solution, the present invention has at least the following beneficial effects: The first dissolving tank is used to react the ammonium metasquamousate residue and the phosphorus-removing vanadium slag solution to obtain phosphorus-removing vanadium slag slurry. The first separator is connected to the first dissolving tank and includes a first outlet and a second outlet. The first outlet is connected to the buffer tank, and the second outlet is connected to the second dissolving tank. The phosphorus-removing vanadium slag slurry can be separated into solid and liquid components, and the separated first vanadium-containing filtrate and first residue are output through different outlets. This avoids the first residue from being mixed into the first vanadium-containing filtrate, which helps to improve the accuracy of the first vanadium-containing filtrate and thus improves the vanadium recovery rate. The first residue is dissolved again in the second dissolving tank, which helps to further extract vanadium from the first residue, thereby further improving the vanadium recovery rate. The second dissolving tank is connected to the second separator, which includes a third outlet and a fourth outlet. The third outlet is connected to the buffer tank. The second separator can perform solid-liquid separation of the residue slurry and output the separated second vanadium-containing filtrate and the second residue through different outlets. This avoids the second residue from being mixed into the second vanadium-containing filtrate, which helps to improve the accuracy of the second vanadium-containing filtrate and thus improves the overall vanadium recovery rate. The entire system can simultaneously achieve vanadium extraction from phosphorus-removed vanadium slag and ammonium metavanadate residue without complex vanadium extraction processes. This achieves efficient recovery of vanadium from phosphorus-removed slag and ammonium metavanadate residue, improves vanadium extraction efficiency, and saves recovery costs. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of a vanadium extraction system for phosphorus-removing vanadium slag and ammonium metavanadate residue disclosed in some embodiments of this utility model.
[0024] Explanation of reference numerals in the attached figures:
[0025] 1. Supply device; 2. First dissolving tank; 3. First separator; 4. Second dissolving tank; 5. Second separator; 6. Buffer tank; 7. Vanadium recovery device; 8. Ammonia absorption device; 9. First outlet; 10. Second outlet; 11. Third outlet; 12. Fourth outlet. Detailed Implementation
[0026] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0027] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values set forth in these embodiments should be interpreted as exemplary only and not as limiting.
[0028] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0029] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.
[0030] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.
[0031] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.
[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.
[0033] like Figure 1 As shown, Figure 1 This is a front view of a vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residue disclosed in some embodiments of the present invention. The system includes a first dissolving tank 2, a first separator 3 connected to the first dissolving tank 2, a buffer tank 6, a second dissolving tank 4, and a second separator 5 connected to the outlet of the second dissolving tank 4. The first dissolving tank 2 is used to dissolve the ammonium metavanadate residue and the dephosphorized vanadium slag solution, causing a chemical reaction between the two to obtain a dephosphorized vanadium slag slurry. The first separator 3 includes a first outlet 9 and a second outlet 10, and is used for solid-liquid separation. The phosphorus-vanadium slag slurry yields a first vanadium-containing filtrate and a first residue, which are output from the first outlet 9 and the second outlet 10, respectively. The buffer tank 6 is connected to the first outlet 9, and the second dissolving tank 4 is connected to the second outlet 10. The second dissolving tank 4 is used to pulp and wash the first residue to obtain a residue slurry. The second separator 5 includes a third outlet 11 and a fourth outlet 12. The third outlet 11 is connected to the buffer tank 6. The second separator 5 is used to press the residue slurry and separate it to obtain a second vanadium-containing filtrate and a second residue. The second vanadium-containing filtrate is output from the third outlet 11, and the second residue is output from the fourth outlet 12.
[0034] The ammonium metavanadate residue can be the residue obtained after vanadium slag undergoes sodium salt roasting, leaching, and precipitation, or it can be the residue obtained after further processing of vanadium-containing raw materials such as coal shale, waste catalyst, and ferrophosphate to precipitate vanadium. The sodium salt can be one or a mixture of sodium chloride and sodium carbonate. The dephosphorized vanadium slag is the product of adding calcium chloride to the vanadium leaching solution to remove phosphorus, in which vanadium mainly exists in the form of water-insoluble calcium vanadate.
[0035] The aforementioned vanadium extraction system for vanadium-removing slag and ammonium metavanadate residue includes a first dissolving tank 2 for reacting the ammonium metavanadate residue and the vanadium-removing slag solution to obtain a vanadium-removing slag slurry. A first separator 3 is connected to the first dissolving tank 2 and includes a first outlet 9 and a second outlet 10. The first outlet 9 is connected to a buffer tank 6, and the second outlet 10 is connected to a second dissolving tank 4. This system can perform solid-liquid separation of the vanadium-removing slag slurry and output the separated first vanadium-containing filtrate and first residue through different outlets. This avoids the first residue being mixed into the first vanadium-containing filtrate, which helps to improve the accuracy of the first vanadium-containing filtrate and thus improves the vanadium recovery rate. The first residue is dissolved again in the second dissolving tank 4, which helps to further extract vanadium from the first residue, thereby further improving the vanadium recovery rate. The second dissolving tank 4 is connected to the second separator 5, which includes a third outlet 11 and a fourth outlet 12. The third outlet 11 is connected to the buffer tank 6. The second separator 5 can perform solid-liquid separation of the residue slurry and output the separated second vanadium-containing filtrate and the second residue through different outlets to avoid the second residue from being mixed into the second vanadium-containing filtrate, which helps to improve the accuracy of the second vanadium-containing filtrate and thus improves the overall vanadium recovery rate. The entire system can simultaneously achieve vanadium extraction from phosphorus-removed vanadium slag and ammonium metavanadate residue without complex vanadium extraction processes, realizing efficient recovery of vanadium from phosphorus-removed slag and ammonium metavanadate residue, improving vanadium extraction efficiency and saving recovery costs.
[0036] According to several embodiments of this utility model, the ammonium metavanadate residue and the vanadium-removing slag solution are added to the first dissolving tank 2 in a ratio of 1:3 to 1:10. By rationally controlling the addition ratio of the ammonium metavanadate residue and the vanadium-removing slag solution to the first dissolving tank 2, the vanadium in the ammonium metavanadate residue can be fully dissolved, which is beneficial to improving the vanadium recovery rate.
[0037] According to several embodiments of this utility model, the weight of water added to the second dissolving tank 4 is 3 to 5 times the weight of the first residue. By reasonably controlling the proportion of water added to the second dissolving tank 4, it is possible to ensure that the first residue is fully dissolved without wasting resources.
[0038] According to several embodiments of the present invention, in addition to the vanadium extraction system for vanadium slag and ammonium metavanadate residue, the vanadium recovery device 7 is also included. The vanadium recovery device 7 is connected to the outlet of the buffer tank 6 and is used to treat the first vanadium-containing filtrate and / or the second vanadium-containing filtrate to obtain ammonium polyvanadate.
[0039] According to several embodiments of the present invention, the vanadium recovery device 7 includes a precipitation reactor. The precipitation reactor is a device used for carrying out precipitation reactions, through chemical reactions or physical processes, to treat the first and second vanadium-containing filtrates to obtain ammonium polyvanadate (APV), while the remaining waste liquid can be further treated in a water treatment process.
[0040] According to several embodiments of the present invention, the vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residue further includes a supply device 1, which is connected to a first dissolving tank 2 and is used to input the dissolved dephosphorized vanadium slag solution into the first dissolving tank 2. The supply device 1 includes a belt conveyor.
[0041] According to several embodiments of the present invention, the vanadium extraction system for vanadium slag and ammonium metavanadate residue also includes an ammonia absorption device 8. The ammonia absorption device 8 is installed between the first separator 3 and the buffer tank 6 and is connected to both of them. The ammonia absorption device 8 is used to dilute the ammonia gas generated in the first dissolving tank 2 to obtain an ammonia-containing solution, which is then fed into the buffer tank 6.
[0042] Specifically, the ammonium metavanadate residue is first added to the first dissolving tank 2, and then the dephosphorized vanadium slag is added to the first dissolving tank 2 through the supply device 1. This allows the vanadium in the ammonium metavanadate residue to be fully dissolved. The ammonium metavanadate residue and the dephosphorized vanadium slag in the first dissolving tank 2 undergo the following two chemical reactions.
[0043] CaV2O6+(NH4)2SO4→2NH4VO3+CaSO4……(1)
[0044] Ca3V2O8+3(NH4)2SO4→2NH4VO3+3CaSO4+4NH3+H2O……(2)
[0045] Calcium sulfate is generated through the two chemical reactions described above, reducing the vanadium content in the vanadium-phosphate slag but producing ammonia. The ammonia absorption device 8 can dilute the high ammonia content in the ammonium metavanadate residue into an ammonia-containing solution, which helps improve vanadium recovery and reduce water treatment costs. The buffer tank 6 stores the dilute ammonia solution output from the ammonia absorption device 8, the first vanadium-containing filtrate obtained from solid-liquid separation by the first separator 3, and the second vanadium-containing filtrate obtained from separation by the second separator 5.
[0046] According to several embodiments of the present invention, the ammonia absorption device 8 includes an alkaline spray tower.
[0047] According to several embodiments of the present invention, the first dissolving tank 2 and the second dissolving tank 4 respectively include a reaction vessel with stirring and heating functions. The reaction vessel with stirring and heating functions can ensure that the reactants in the first dissolving tank 2 and the second dissolving tank 4 are fully mixed, avoiding excessively high or low local temperatures, ensuring uniform reaction, and improving the efficiency of the dissolution reaction.
[0048] According to several embodiments of this utility model, the first separator 3 and the second separator 5 each include an automatic chamber filter press. The automatic chamber filter press achieves efficient solid-liquid separation (solid-liquid separation of phosphorus-removed slag slurry and residual slurry) through automated high-pressure filtration, exhibiting a high degree of automation and high filtration accuracy.
[0049] The foregoing embodiments have provided a detailed description of the vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residue of this utility model. Thus, the embodiments of this disclosure have been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.
[0050] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.
Claims
1. A vanadium extraction system for dephosphorizing vanadium slag and ammonium metavanadate residual liquid, characterized in that, The system comprises: a first dissolving tank for dissolving ammonium metavanadate residual liquid and dephosphorization vanadium residue solution to make them react to obtain dephosphorization vanadium residue slurry; a first separator connected with the first dissolving tank, comprising a first outlet and a second outlet, the first separator being used for solid-liquid separation of the dephosphorization vanadium residue slurry to obtain first vanadium-containing filtrate and first residue, which are output by the first outlet and the second outlet respectively; a buffer tank connected with the first outlet; a second dissolving tank connected with the second outlet, for beating and washing the first residue to obtain residue slurry; a second separator connected with the outlet of the second dissolving tank, comprising a third outlet and a fourth outlet, the third outlet being connected with the buffer tank, the second separator being used for separation of the second vanadium-containing filtrate and the second residue after squeezing the residue slurry, which are output by the third outlet and the fourth outlet respectively.
2. The vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residual solution according to claim 1, characterized in that, The system further comprises a vanadium recovery device connected with the outlet of the buffer tank and used for vanadium precipitation treatment of the first vanadium-containing filtrate and / or the second vanadium-containing filtrate to obtain ammonium polyvanadate.
3. The vanadium extraction system for removing phosphorus vanadium slag and ammonium metavanadate residual liquid according to claim 2, characterized in that, The vanadium recovery device comprises a precipitation reactor.
4. The vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residual solution according to claim 1, characterized in that, The system further comprises a feeding device connected with the first dissolving tank and used for inputting the dissolved dephosphorization vanadium residue solution into the first dissolving tank.
5. The vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residual solution according to claim 4, characterized in that, The feeding device comprises a belt conveyor.
6. The vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residual solution according to claim 1, characterized in that, The system further comprises an ammonia gas absorption device installed at a position between the first separator and the buffer tank and connected with them respectively, the ammonia gas absorption device being used for diluting ammonia gas generated by the first dissolving tank to obtain ammonia-containing solution, which is input into the buffer tank.
7. The vanadium extraction system for phosphorus-removed vanadium slag and ammonium metavanadate residue according to claim 6, characterized in that, The ammonia gas absorption device comprises an alkali liquor spray tower.
8. The vanadium extraction system for removing phosphorus and ammonium metavanadate residual liquid from vanadium phosphate rock according to claim 1, characterized in that, The first dissolving tank comprises a reactor with stirring and heating functions.
9. The vanadium extraction system from vanadium-bearing phosphate rocks and residual ammonium metavanadate solution according to claim 8, characterized by the fact that it comprises a reactor (2) for the oxidation of the vanadium (IV) to vanadium (V) and a reactor (3) for the reduction of vanadium (V) to vanadium (IV). The second dissolving tank comprises a reactor with stirring and heating functions.
10. The vanadium extraction system for dephosphorized vanadium slag and ammonium metavanadate residual solution according to claim 1, characterized in that, The first separator and the second separator each comprise an automatic chamber filter press.