Method for preparing vanadium oxide from high-phosphorus manganese-containing acidic vanadium liquid

Abstract

The invention discloses a method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid, which comprises the following steps: (1) adjusting the pH value of the high-phosphorus manganese-containing acidic vanadium liquid to 0.8-1.0, stirring and reacting at 70-90 DEG C for 10-30 minutes, adjusting the pH value of the system to 1.0-1.4, continuously reacting for 30-90 minutes, and carrying out solid-liquid separation to obtain a precipitate A; (2) adding the precipitate A into an ammonia water solution, heating to 65-80 DEG C, stirring and reacting for 20-60 minutes, and carrying out solid-liquid separation to obtain a vanadium-containing solution B; (3) cooling the vanadium-containing liquid B to 5-30 DEG C, standing for 30-90 minutes, and carrying out solid-liquid separation to obtain a precipitate C and a supernatant D; and (4) calcining the precipitate C at 500-600 DEG C to obtain a vanadium oxide product. According to the preparation method, phosphorus and manganese elements in the high-phosphorus manganese-containing vanadium liquid vanadium precipitation product can be effectively removed, the purity of the product is improved, and the preparation method has very important economic value.

Description

Technical Field

[0001] The invention relates to the technical field of vanadium hydrometallurgy, in particular to a method for preparing vanadium oxide from high-phosphorus manganese-containing acidic vanadium liquid. Background Art

[0002] As an important micro-alloying element, vanadium is widely used in metallurgy, chemical industry, aerospace and other fields. It can significantly improve the strength, toughness and ductility of steel, providing important support for ensuring the quality of key national projects.

[0003] In the process of extracting vanadium from vanadium-containing materials, a vanadium-extracting raw material containing high calcium, high phosphorus and manganese is involved. During the roasting-leaching process, vanadium, phosphorus and manganese will be leached into the solution at the same time to form a high-phosphorus and high-manganese acidic vanadium-containing solution. Among them, P is an important harmful element that affects the purity and vanadium precipitation rate of the product. It is difficult to remove phosphorus using ordinary chemical impurity removal methods. Even if phosphorus can be removed, vanadium will enter the precipitate, resulting in a large loss of vanadium. In addition, the manganese-containing acid leaching vanadium solution also has the problem of high manganese content in the product during the vanadium precipitation process.

[0004] At present, the vanadium precipitation process in the industrial vanadium extraction process is mainly chemical precipitation, including hydrolysis precipitation, ammonium salt precipitation, iron salt precipitation, etc. Hydrolysis precipitation is to add acid to the vanadium-containing solution to make the vanadate ions aggregate to form decavanadate ions, which are finally hydrolyzed to form H6V 10 O 28 Precipitation, i.e. hydration of vanadium pentoxide, is simple to operate, has low production costs, and allows vanadium concentration to fluctuate in a wide range. The disadvantage is that the product purity is low, and it has now been basically replaced by ammonium salt precipitation. Most ammonium salt precipitation is acidic ammonium salt precipitation, which is to add ammonium salt to vanadium liquid. Ammonium ions can combine with vanadium oxide ions to form ammonium meta / polyvanadate precipitates. This method can obtain products with higher purity and high vanadium precipitation rate, but it is not effective in removing impurity P in vanadium liquid, and ammonium-containing vanadium precipitation wastewater needs to be treated later. The iron salt precipitation process is to mix vanadium liquid with iron salt solution, heat and stir to precipitate vanadium to obtain a green solid product. The composition of the product is complex and the purity of the vanadium product is low.

[0005] Chinese patent application CN201811458156 discloses a method for preparing vanadium oxide from high-phosphorus vanadium-containing liquid, comprising the following steps: adding ammonium salt to the high-phosphorus vanadium-containing liquid, adding a conversion agent to adjust the pH to 1.0-1.5, then heating to precipitate vanadium, and after the precipitation of vanadium, liquid-solid separation, washing, and calcination are performed to obtain a vanadium pentoxide product; the vanadium / phosphorus mass ratio in the high-phosphorus vanadium-containing liquid is 100-1000:1; the conversion agent is a reagent that can provide H+; the heating vanadium precipitation process is 70-85°C for 5-30 minutes, and then heated to boiling state for 60-120 minutes. The phosphorus content of the vanadium liquid treated by the method used in this patent is about 0.12g / L or less, and the phosphorus content of the treated vanadium pentoxide product is P=0.018% or more, and the phosphorus removal effect is not ideal.

[0006] Chinese patent application CN202011182648 provides a method for extracting vanadium from high-phosphoric acid vanadium liquid and recycling wastewater. The method includes: a: adding an oxidant (at least one of ammonium persulfate, sodium persulfate, sodium chlorate, potassium chlorate and hydrogen peroxide) to the high-phosphoric acid vanadium liquid, then filtering to obtain a vanadium liquid, and then extracting to obtain a vanadium-rich organic phase and a raffinate; b: returning the raffinate to the leaching process for use; c: performing a first-stage reverse extraction on part of the vanadium-rich organic phase to obtain a stripping solution, and then adding an alkaline substance to the stripping solution, and then adding the remaining vanadium-rich organic phase for a second-stage reverse extraction to obtain a high-concentration vanadium liquid; d: adding a vanadium precipitation agent to the high-concentration vanadium liquid for reaction, and then filtering to obtain ammonium metavanadate and a vanadium precipitation residual solution, calcining the ammonium metavanadate to obtain vanadium oxide; e: pretreating the vanadium precipitation residual solution, and then returning to step c for use; the above patent application uses an ammonium-containing oxidant for vanadium precipitation, and the dephosphorization effect is not good.

[0007] Therefore, researchers have developed a method for preparing vanadium oxide in high-phosphorus and manganese-containing acidic vanadium liquid, which can effectively remove phosphorus and manganese elements in vanadium precipitate from high-phosphorus and manganese-containing vanadium liquid, improve product purity, and has very important economic value. Summary of the invention

[0008] The object of the present invention is to provide a method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid. First, low-pH vanadium precipitation is used to separate vanadium from phosphorus, and vanadium and manganese are preliminarily separated to obtain a vanadium-containing low-manganese precipitate, which is then subjected to alkali leaching to separate vanadium and manganese in the precipitate to obtain a vanadium-containing solution with high purity. Finally, the ammonium metavanadate precipitate is cooled and crystallized to prepare a vanadium oxide product with high purity by calcining, thereby greatly reducing the content of phosphorus and manganese impurities in the vanadium oxide product.

[0009] In order to achieve the above object, the present invention provides a method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid, comprising the following steps: Step (1): adjusting the pH of the high-phosphorus manganese-containing acidic vanadium solution to 0.8-1.0, stirring and reacting at 70-90° C. for 10-30 min, adjusting the system pH to 1.0-1.4, continuing to stir and react for 30-90 min, performing solid-liquid separation, and obtaining a precipitate A; Step (2): adding the precipitate A to an aqueous ammonia solution, heating to 65-80° C. and stirring for reaction for 20-60 min, performing solid-liquid separation, and obtaining a vanadium-containing liquid B; Step (3): cooling the vanadium-containing liquid B to 5-30° C., allowing it to stand for 30-90 minutes, and performing solid-liquid separation to obtain a precipitate C and an upper liquid D; Step (4): calcining the precipitate C at 500-600° C. to obtain a vanadium oxide product.

[0010] According to the method for preparing vanadium oxide from high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (1), the mass ratio of vanadium to phosphorus in the high-phosphorus manganese-containing acidic vanadium liquid is less than 100:1.

[0011] According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (1), the content of vanadium in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 8 g / L.

[0012] According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (1), the phosphorus content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 0.3 g / L.

[0013] According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (1), the phosphorus content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 1 g / L.

[0014] According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (1), the manganese content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 3 g / L.

[0015] According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (1), the pH of the high-phosphorus manganese-containing acidic vanadium liquid is adjusted by adding hydrochloric acid, sulfuric acid or an aqueous ammonia solution.

[0016] According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in the step (2), the mass fraction of NH3 in the ammonia solution is 8-15%, and the solid-liquid ratio of the precipitate A to the ammonia solution is 1:8-1:12 g / mL.

[0017] According to the method for preparing vanadium oxide from high-phosphorus manganese-containing acidic vanadium liquid of the present invention, preferably, in step (3), NH3 gas or NH4 + When the mass fraction of NH3 in the solution reaches 8-15%, it can be returned to step (2) as aqueous ammonia.

[0018] The beneficial effects of the present invention are: The present invention provides a method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid. The method comprises the following steps: firstly, low-pH vanadium precipitation is used to separate vanadium from phosphorus, and vanadium and manganese are preliminarily separated to obtain a vanadium-containing low-manganese precipitate. The precipitate is then alkali-leached to separate vanadium and manganese in the precipitate to obtain a vanadium-containing solution with high purity. Finally, the solution is cooled and crystallized, and the obtained ammonium metavanadate is precipitated and calcined to prepare a vanadium oxide product with high purity, wherein the purity of the vanadium oxide reaches more than 99.5%, the content of manganese is reduced to less than 0.04%, and the content of phosphorus is reduced to less than 0.01%. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The present invention is a schematic diagram of the process flow of a method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0022] When the acidic vanadium liquid that the resource utilization method of the present invention is suitable for treating uses a high-calcium, high-phosphorus, manganese-containing raw material to extract vanadium, a high-phosphorus, high-manganese acidic vanadium-containing solution, i.e., a high-phosphorus, manganese-containing acidic vanadium liquid, is formed. The vanadium liquid contains high phosphorus and manganese contents. P is an important harmful element that affects the purity of the product. It is difficult to remove phosphorus by using ordinary chemical impurity removal methods. Even if phosphorus can be removed, vanadium will enter precipitation, resulting in a large loss of vanadium and reducing the recovery rate of vanadium.

[0023] A method for recovering vanadium from a high-phosphorus manganese-containing acidic vanadium liquid according to the present invention, as follows Figure 1 As shown, the method mainly comprises: step (1): adjusting the pH of the high-phosphorus manganese-containing acidic vanadium liquid to 0.8-1.0, stirring and reacting at 70-90°C for 10-30 minutes, adjusting the system pH to 1.0-1.4, continuing the reaction for 30-90 minutes, performing solid-liquid separation, and obtaining a precipitate A; step (2): adding the precipitate A to an ammonia solution, heating to 65-80°C and stirring and reacting for 20-60 minutes, performing solid-liquid separation, and obtaining a vanadium-containing liquid B; step (3): cooling the vanadium-containing liquid B to 5-30°C, standing for 30-90 minutes, performing solid-liquid separation, and obtaining a precipitate C and an upper layer liquid D; step (4): calcining the precipitate C at 500-600°C to obtain a vanadium oxide product.

[0024] With respect to step (1) of the present invention, the mass ratio of vanadium to phosphorus in the high-phosphorus manganese-containing acidic vanadium liquid is less than 100:1.

[0025] With respect to step (1) of the present invention: According to the method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid described in the present invention, preferably, in step (1), the phosphorus content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 0.3 g / L.

[0026] As a specific embodiment of the present invention, in step (1), the phosphorus content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 1 g / L; preferably, in step (1), the manganese content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 3 g / L.

[0027] As another specific embodiment of the present invention, in step (1), the pH of the high-phosphorus manganese-containing acidic vanadium liquid is adjusted by adding hydrochloric acid, sulfuric acid or ammonia solution.

[0028] With respect to step (2) of the present invention: adding precipitate A to an aqueous ammonia solution, heating to 65-80° C. and stirring for reaction for 20-60 min, performing solid-liquid separation, and obtaining a vanadium-containing liquid B; preferably, the mass fraction of NH3 in the aqueous ammonia solution is 8-15%; more preferably, the solid-liquid ratio of precipitate A to the aqueous ammonia solution is 1:8-1:12 g / mL.

[0029] In step (3) of the present invention, the vanadium-containing liquid B is cooled to 5-30°C, left to stand for 30-90 minutes, and solid-liquid separation is performed to obtain a precipitate C and an upper liquid D; preferably, in step (3), the upper liquid D is supplemented with NH3 gas or NH4 + When the mass fraction of NH3 in the solution is 8-15%, it can be returned to step (2) as ammonia water. The method of the present invention improves the vanadium precipitation rate by repeatedly utilizing the upper layer liquid D and further recovering the vanadium in the upper layer liquid.

[0030] The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present invention can process the high-phosphorus manganese-containing acidic vanadium liquid produced after vanadium extraction from high-calcium and high-phosphorus manganese-containing raw materials to obtain high-quality vanadium pentoxide products. Among them, P is an important harmful element that affects the vanadium precipitation rate and product purity. When the phosphorus in the vanadium liquid reaches a certain level, the vanadium precipitation rate is low by using a conventional vanadium precipitation method, and it is difficult to obtain a qualified vanadium oxide product; phosphorus is difficult to remove by using an ordinary chemical impurity removal method. Even if phosphorus can be removed, vanadium will enter the precipitate, resulting in a large loss of vanadium.

[0031] Research has found that in a highly phosphoric acid-containing vanadium solution (especially a solution with P>0.5g / L), when the pH is higher than 1.0, vanadium phosphatic heteropoly acid is easily formed. This substance is highly stable, resulting in a low vanadium precipitation rate. Therefore, the present invention first adjusts the solution pH to 0.8-1.0 to destroy the vanadium phosphatic heteropoly acid structure, dissociate the vanadium, and increase the vanadium precipitation rate. The precipitate obtained at pH = 0.8-1.0 has a high manganese content, and a large amount of VO2 remains in the solution. + Therefore, the present invention adds ammonia water to adjust the pH of the system to 1.0-1.4, introduces ammonium ions, reduces the manganese content in the precipitate, and promotes VO2 + Transformed into a state that is easy to precipitate (such as [V 10 O 28 ] 6-), thereby improving the vanadium precipitation rate. In order to obtain a product with higher purity, the present invention utilizes the difference in solubility of vanadium and manganese under alkaline conditions to purify the vanadium precipitate under acidic conditions, thereby further separating vanadium and manganese. It can be seen that in the more optimal technical solution of the present invention, a vanadium oxide product with higher purity can be prepared from a high-phosphorus solution, while ensuring that the vanadium precipitation rate is not significantly reduced, thereby ensuring the quality of the vanadium oxide product.

[0032] Example 1 The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present embodiment comprises the following steps: Step (1): adding sulfuric acid solution to 200 ml of high-phosphorus manganese-containing acidic vanadium liquid to adjust the pH to 1.0, stirring and reacting at 80° C. for 30 minutes, adding ammonia water to adjust the pH to 1.2, continuing to stir for 60 minutes, and then performing solid-liquid separation to obtain precipitate A (containing 0.44% manganese and 0.012% phosphorus), with a vanadium precipitation rate of 97.2%; wherein the vanadium content in the high-phosphorus manganese-containing acidic vanadium liquid is 19.81 g / L, the phosphorus content is 0.31 g / L, and the manganese content is 11.2 g / L; Step (2): adding the precipitate A to an ammonia solution, heating to 80°C and stirring for reaction for 30 minutes, and performing solid-liquid separation to obtain a vanadium-containing liquid B; wherein the mass fraction of NH3 in the ammonia solution is 15%, and the solid-liquid ratio of the precipitate A to the ammonia solution is 8:1; Step (3): Cool the vanadium-containing liquid B to 10°C, let it stand for 40 minutes, and perform solid-liquid separation to obtain a precipitate C and an upper liquid D (containing vanadium 3.2 g / L); supplement the upper liquid D with NH3 gas or NH 4+ After the NH3 mass fraction in the solution reaches 15%, it is returned to step (2) as an ammonia solution; Step (4): calcining the precipitate C at 550° C. to obtain a vanadium oxide product.

[0033] The composition of the vanadium oxide product obtained in Example 1 is shown in Table 1.

[0034] Example 2 The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present embodiment comprises the following steps: Step (1): adding hydrochloric acid solution to 200 ml of high-phosphorus manganese-containing acidic vanadium liquid to adjust the pH to 0.8, stirring and reacting at 70° C. for 10 minutes, adding ammonia water to adjust the pH to 1.1, continuing to stir and react for 60 minutes, and then performing solid-liquid separation to obtain precipitate A (containing 0.57% manganese and 0.011% phosphorus), with a vanadium precipitation rate of 97.5%; wherein the vanadium content in the high-phosphorus manganese-containing acidic vanadium liquid is 17.01 g / L, the phosphorus content is 0.78 g / L, and the manganese content is 6.05 g / L; Step (2): adding the precipitate A to an ammonia solution, heating to 70°C and stirring for reaction for 20 minutes, and performing solid-liquid separation to obtain a vanadium-containing liquid B; wherein the mass fraction of NH3 in the ammonia solution is 10%, and the solid-liquid ratio of the precipitate A to the ammonia solution is 10:1; Step (3): Cool the vanadium-containing liquid B to 15°C, let it stand for 60 minutes, and perform solid-liquid separation to obtain a precipitate C and an upper liquid D (containing vanadium 5.8 g / L); supplement the upper liquid D with NH3 gas or NH 4+ After the mass fraction of NH3 in the solution reaches 10%, it is returned to step (2) as an ammonia solution; Step (4): calcining the precipitate C at 550° C. to obtain a vanadium oxide product.

[0035] The composition of the vanadium oxide product obtained in Example 1 is shown in Table 1.

[0036] Example 3 The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid of the present embodiment comprises the following steps: Step (1): adding hydrochloric acid solution to 200 ml of high-phosphorus manganese-containing acidic vanadium liquid to adjust the pH to 0.9, stirring and reacting at 90° C. for 20 minutes, adding ammonia water to adjust the pH to 1.4, continuing to stir and react for 90 minutes, and then performing solid-liquid separation to obtain precipitate A (containing 0.34% manganese and 0.017% phosphorus), with a vanadium precipitation rate of 98.3%; wherein the vanadium content in the high-phosphorus manganese-containing acidic vanadium liquid is 11.92 g / L, the phosphorus content is 1.52 g / L, and the manganese content is 4.27 g / L; Step (2): adding the precipitate A to an ammonia solution, heating to 80°C and stirring for reaction for 30 minutes, and performing solid-liquid separation to obtain a vanadium-containing liquid B; wherein the mass fraction of NH3 in the ammonia solution is 12%, and the solid-liquid ratio of the precipitate A to the ammonia solution is 12:1; Step (3): Cool the vanadium-containing liquid B to 5°C, let it stand for 40 minutes, and perform solid-liquid separation to obtain a precipitate C and an upper liquid D (containing vanadium 3.2 g / L); supplement the upper liquid D with NH3 gas or NH 4+ When the mass fraction of NH3 in the solution reaches 12%, it can be returned to step (2) as an ammonia solution; Step (4): calcining the precipitate C at 550° C. to obtain a vanadium oxide product.

[0037] The composition of the vanadium oxide product obtained in Example 1 is shown in Table 1.

[0038] Comparative Example 1 The components and contents of the high-phosphorus manganese-containing acidic vanadium liquid treated in this comparative example are the same as those in Example 1, and the specific steps are as follows: Step (1): adding sulfuric acid solution to 200 ml of high-phosphorus manganese-containing acidic vanadium liquid to adjust the pH to 1.6, adding ammonium sulfate, wherein the molar ratio of ammonium ion to vanadium ion is 1.5, stirring and reacting at 95° C. for 60 minutes, and then performing solid-liquid separation to obtain precipitate A (containing 1.5% manganese and 0.085% phosphorus), with a vanadium precipitation rate of 85.1%; Step (2): calcining the precipitate A at 550° C. to obtain a vanadium oxide product.

[0039] The composition of the vanadium oxide product obtained in Comparative Example 1 is shown in Table 1.

[0040] Comparative Example 2 The components and contents of the high-phosphorus manganese-containing acidic vanadium liquid treated in this comparative example are the same as those in Example 2, and the specific steps are as follows: Step (1): adding hydrochloric acid solution to 200 ml of high-phosphorus manganese-containing acidic vanadium liquid to adjust the pH to 0.8, stirring the mixture at 70° C. for 90 minutes, and then performing solid-liquid separation to obtain precipitate A (containing 1.89% manganese and 0.01% phosphorus), with a vanadium precipitation rate of 96.1%; Step (2): adding precipitate A to an aqueous ammonia solution, heating to 70°C and stirring for reaction for 20 minutes, the precipitate does not dissolve and it is difficult to obtain a purified product; wherein the mass fraction of NH3 contained in the aqueous ammonia solution is 10%, and the solid-liquid ratio of precipitate A to the aqueous ammonia solution is 10:1.

[0041] Table 1 Composition of vanadium oxide products / %

[0042] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid, characterized in that: The steps include: Step (1): adjusting the pH of the high-phosphorus manganese-containing acidic vanadium solution to 0.8-1.0, stirring and reacting at 70-90° C. for 10-30 min, adjusting the system pH to 1.0-1.4, continuing to stir and react for 30-90 min, performing solid-liquid separation, and obtaining a precipitate A; Step (2): adding the precipitate A to an aqueous ammonia solution, heating to 65-80° C. and stirring for reaction for 20-60 min, performing solid-liquid separation, and obtaining a vanadium-containing liquid B; Step (3): cooling the vanadium-containing liquid B to 5-30° C., allowing it to stand for 30-90 minutes, and performing solid-liquid separation to obtain a precipitate C and an upper liquid D; Step (4): calcining the precipitate C at 500-600° C. to obtain a vanadium oxide product.

2. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In step (1), the mass ratio of vanadium to phosphorus in the high-phosphorus manganese-containing acidic vanadium liquid is less than 100:

1.

3. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In the step (1), the vanadium content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 8 g / L.

4. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In the step (1), the phosphorus content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 0.3 g / L.

5. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In the step (1), the phosphorus content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 1 g / L.

6. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In the step (1), the manganese content in the high-phosphorus manganese-containing acidic vanadium liquid is not less than 3 g / L.

7. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 2, characterized in that: In the step (1), the pH of the high-phosphorus manganese-containing acidic vanadium liquid is adjusted by using hydrochloric acid, sulfuric acid or an aqueous ammonia solution.

8. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In the step (2), the mass fraction of NH3 in the aqueous ammonia solution is 8-15%.

9. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In the step (2), the solid-to-liquid ratio of the precipitate A to the aqueous ammonia solution is 1:8-1:12 g / mL.

10. The method for preparing vanadium oxide from a high-phosphorus manganese-containing acidic vanadium liquid according to claim 1, characterized in that: In step (3), NH3 gas or NH 4+ When the mass fraction of NH3 in the solution reaches 8-15%, it can be returned to step (2) as aqueous ammonia.

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