CN102134649B - Comprehensive utilization method for vanadium slag - Google Patents

Abstract

The invention provides a comprehensive utilization method of vanadium slag, which is characterized in that the following steps are carried out: (1) crushing and grinding, (2) mixing, (3) melting, (4) dissolving and filtering, (5) precipitation of vanadium, (6) preparation of iron oxide. The present invention has a wide range of sources of raw materials, uses vanadium slag as a whole at one time, and realizes the recycling of intermediate products, reduces the consumption of raw materials and water, has no secondary pollution, has simple process, mild operating conditions, low cost, high added value of products, and is economical. High benefit. It not only solves the problem of effectively removing iron in the process of producing high-purity vanadium pentoxide, but also rationally utilizes resources such as vanadium and iron, and provides a new way for comprehensive utilization of vanadium slag.

Description

A kind of comprehensive utilization method of vanadium slag

technical field

The invention relates to a comprehensive utilization method of vanadium slag, which belongs to the technical field of metallurgy.

Background technique

South Africa, Russia and China are major vanadium producers and exporters in the world, while the European Union, Japan and the United States are major importers. It is predicted that in the next 10 years, the world can provide a market space of 100,000 tons of vanadium (equivalent to vanadium pentoxide) per year. It is estimated that from 2011 to 2020, the demand for vanadium in the world will maintain a continuous growth trend, with an annual growth rate of about 4.3%. Vanadium usually exists in the form of vanadium-containing minerals or similar substances, which prevents vanadium from obtaining vanadium concentrate through mechanical beneficiation like copper, lead, zinc and other non-ferrous metals. Therefore, in the existing vanadium extraction process, the processed ore and /Or the grade of waste residue is low, so it is more practical to find a treatment process suitable for low-grade vanadium ore and/or waste residue.

Panzhihua in Sichuan, Chengde in Hebei and Ma'anshan in Anhui have a large amount of waste vanadium slag, which discharges nearly 1.2 million tons per year. The vanadium content in these vanadium slags is generally low, generally about 2%, and most of them exist in vanadium calcium titanate , is the main object of vanadium extraction, because it contains nearly 40% CaO, it is more difficult to extract than other vanadium ores.

The technology with the patent application number 200710202445.8 adopts the calcification roasting-sulfuric acid leaching process, uses CaCO ₃ as the calcium source additive, roasts the vanadium slag, and leaches the vanadium in the roasted product with sulfuric acid. However, this process has the following disadvantages: (1) there is new waste and new pollution, resulting in the loss of some mineral resources; (2) the leaching time is long, and the acid consumption is relatively large, and 81t of sulfuric acid is consumed for every 1t of vanadium pentoxide produced. At present, it cannot be recycled; (3) sulfur dioxide volatilizes in the process, which will cause serious air pollution and operator poisoning; (4) sulfuric acid is highly corrosive under heating conditions, which seriously corrodes equipment and is unsafe in production.

Vanadium extraction by sodium roasting is a process that is widely used for extracting vanadium from vanadium-containing raw materials. Its basic principle is: using sodium salts such as table salt or soda as additives, and converting multivalent vanadium into water-soluble sodium salt of pentavalent vanadium by roasting : 4NaCl+2V ₂ O ₅ +O ₂ =4NaVO ₃ +Cl ₂

Then directly immerse the sodium roasted product in water to obtain a leaching solution containing vanadium and a small amount of aluminum impurities, and then add ammonium salt (acidic ammonium salt precipitation method) to obtain ammonium metavanadate precipitation, and obtain crude vanadium pentoxide after roasting . After alkali dissolution, impurity removal and second vanadium precipitation with ammonium salt, ammonium metavanadate can be obtained. After roasting, V ₂ O ₅ with a purity greater than 98% can be obtained. Sulfuric acid can also be used to impregnate roasted products:

2NaVO ₃ +H ₂ SO ₄ =Na ₂ SO ₄ +H ₂ O+V ₂ O ₅

Crude V ₂ O ₅ is obtained by separation, and after alkali dissolution, impurity removal, and second vanadium precipitation with ammonium salt, ammonium metavanadate is obtained, and high-purity vanadium pentoxide can be obtained through roasting. Sodium roasting vanadium extraction method is relatively mature, simple operation, small initial investment, strong selectivity to vanadium, high recovery rate, has been the main method of extracting vanadium from raw ore in my country. However, due to the production of a large amount of toxic gases such as Cl ₂ , HCl and SO ₂ during sodium roasting, with the global emphasis on environmental protection and effective utilization of resources, it has become a global trend to find new low-pollution, high-efficiency vanadium extraction processes. An urgent problem to be solved in the smelting industry.

Contents of the invention

Purpose of the invention: the present invention provides a method for comprehensive utilization of vanadium slag, the purpose of which is to solve the problems of high pollution, low efficiency and unsafety in previous methods for extracting vanadium from vanadium slag; the present invention obtains pentoxide from vanadium slag Vanadium and iron oxide.

Technical solution: the present invention is achieved through the following technical solutions:

A comprehensive utilization method of vanadium slag is characterized in that it is carried out according to the following steps:

(1) Crushing and grinding: the vanadium slag is crushed and ground to obtain a powder with a diameter of 70-170 μm;

(2) Mixing: Mix the vanadium slag powder with ammonium sulfate and ammonium potassium sulfate evenly, and mix the materials into vanadium slag powder by weight percentage: ammonium sulfate: potassium ammonium sulfate=1:5～12:2～5;

(3) Melting: raise the temperature of the above mixed material to 270-440°C and keep it warm for 10-45 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: dissolving the above-mentioned block solid in an aqueous solution of EDTA with a concentration of 0.1 to 0.3 mol/L, so that iron in the block solid and EDTA undergo a chelation reaction to form a stable chelate. And the molar ratio of EDTA to the iron in the massive solid is 0.5～1.1:1, then filter to obtain the filtrate and residue, the residue is iron cement;

(5) Precipitation of vanadium: pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 1.3-2.7, and the temperature is 40-80°C to precipitate the vanadium in the filtrate, and burn it at 220-360°C for 30 ～150min, get vanadium pentoxide;

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the mother liquor of vanadium precipitation, adjust the pH to 6.8-7.5, and burn the mother liquor at 400-520°C for 30-60 minutes to obtain iron oxide; The gaseous substance produced in the process is cooled to obtain a mixture of ammonium sulfate and potassium ammonium sulfate, which is recycled to step (2) for reuse.

For the vanadium slag described in the step "⑴", the weight percentage of iron is 20%-30%, and the weight percentage of vanadium is 0.8%-3.0%.

In the filtrate of the step (4), the percentage of water-soluble vanadium to the total weight of vanadium in the vanadium slag is ≥93%, and the percentage of water-soluble iron to the total weight of iron in the vanadium slag is ≤30%.

In the step (5), the vanadium precipitated in the form of vanadium pentoxide accounts for ≥99% of the total weight of vanadium in the filtrate; the percentage of iron precipitated in the form of iron oxide accounts for ≤0.0005% of the total weight of iron in the filtrate.

The product vanadium pentoxide has a weight purity of ≥98%; iron oxide has a weight purity of ≥99%, and its crystal form is nanometer iron oxide.

Advantages and effects:

Compared with prior art, feature of the present invention and beneficial effect thereof are:

Mixing vanadium slag powder with ammonium sulfate and potassium ammonium sulfate evenly uses the special chemical properties of potassium ammonium sulfate to make the melting reaction more selective: more vanadium is converted into water-soluble vanadium through chemical reactions, and more A small amount of iron is converted into water-soluble iron for preliminary separation of iron and vanadium (usually, the melting reaction is not selective, such as the technology of patent application number 201010576256.9). The water-soluble vanadium accounts for more than 93% of the total weight of vanadium in the vanadium slag, indicating that the conversion rate is high, which cannot be realized by the prior art.

The massive solid obtained from the melting reaction is directly dissolved in the aqueous solution of EDTA, and the pH and temperature are controlled during the precipitation of vanadium to selectively precipitate the vanadium, but the iron does not precipitate, so the products are vanadium pentoxide and iron oxide The purity is high, and the complete separation of vanadium and iron in the vanadium slag is realized, which cannot be realized by the prior art. At the same time, the residue produced by dissolving and filtering the massive solid obtained from the melting reaction is used as iron cement—a new type of high-performance special cement.

The iron oxide obtained by burning the Fe-containing mother liquor at 400-520°C for 30-60 minutes has a crystal form of nano-iron oxide, which is different from ordinary iron oxide, so it has special physical and chemical properties and uses, which greatly improves the additional value of the product. value, which cannot be achieved by existing technologies.

Burn the vanadium precipitate at 220-360° C. for 30-150 minutes, and the obtained vanadium pentoxide has a higher degree of crystallization. It is generally believed that the crystallization degree of the precipitate obtained from the aqueous solution is low, even amorphous, but the present invention greatly improves the crystallization degree of vanadium pentoxide by burning.

For the separation of iron and vanadium, the higher the percentage of iron, the more difficult the separation. Therefore, the iron and vanadium separation process of vanadium slag has always been a research blank for raw materials with a weight percentage of 20% to 30% of iron. Significant advances in technology.

In summary, the present invention has a wide range of sources of raw materials, one-time overall utilization of vanadium slag, and the recycling of intermediate products, reducing the consumption of raw materials and water, no secondary pollution, simple process, mild operating conditions, low cost, and products High added value and high economic benefit. It not only solves the problem of effectively removing iron in the process of producing high-purity vanadium pentoxide, but also rationally utilizes resources such as vanadium and iron, and provides a new way for comprehensive utilization of vanadium slag, and the method of the invention is easy to realize industrial production, and has the advantages of Considerable environmental benefits, social benefits and economic benefits.

Description of drawings:

Fig. 1 is a process flow block diagram of the present invention.

The specific embodiment: the present invention will be further described below in conjunction with accompanying drawing:

The present invention will be described in detail below in conjunction with the examples, but the protection scope of the present invention is not limited to the following examples.

Example 1:

(1) Crushing and grinding: the vanadium slag containing 29% by weight of iron and 1.0% by weight of vanadium is crushed and ground to obtain a powder with a diameter of 80 μm;

(2) Mixing: According to the weight ratio of vanadium slag powder: ammonium sulfate: potassium ammonium sulfate = 1:7:3, weigh the raw materials, and mix the vanadium slag powder with ammonium sulfate and potassium ammonium sulfate evenly;

(3) Melting: raise the temperature of the above-mentioned mixed material to 300°C and keep it warm for 15 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: the block solid obtained above is dissolved in an aqueous solution of EDTA with a concentration of 0.15mol/L, and the molar ratio of EDTA to iron is 0.6:1, and then filtered to obtain the filtrate and residue, the residue is iron cement , the percentage of filtrate water-soluble vanadium accounting for the total weight of vanadium in the vanadium slag is 94%, and the percentage of water-soluble iron accounting for the total weight of iron in the vanadium slag is 27%;

(5) Precipitation of vanadium: pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 1.5 and the temperature to 45°C to precipitate the vanadium in the filtrate, and burn at 240°C for 50min to obtain vanadium pentoxide In this step, the vanadium precipitated in the form of vanadium pentoxide accounts for 99.2% of the total weight of vanadium in the filtrate; the iron precipitated in the form of iron oxide accounts for 0.0004% of the total weight of iron in the filtrate.

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the mother liquor of vanadium precipitation, adjust the pH to 7.0, and burn the mother liquor at 500°C for 60 minutes to obtain iron oxide; cool the gaseous substance produced during the burning process , to obtain ammonium sulfate and potassium ammonium sulfate mixture, which is recycled to step (2) for reuse.

After testing, the product vanadium pentoxide has a weight purity of 99.2%; iron oxide has a weight purity of 99.3%, and its crystal form is nanometer iron oxide.

Example 2:

(1) Crushing and grinding: the vanadium slag containing 20% by weight of iron and 3.0% by weight of vanadium is crushed and ground to obtain a powder with a diameter of 70 μm;

(2) Mixing: According to the weight ratio of vanadium slag powder: ammonium sulfate: ammonium potassium sulfate=1:5:5, weigh the raw materials, and mix the vanadium slag powder with ammonium sulfate and ammonium potassium sulfate evenly;

(3) Melting: raise the temperature of the above-mentioned mixed material to 270°C and keep it warm for 30 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: Dissolve the block solid obtained above in an aqueous solution of EDTA with a concentration of 0.18mol/L, and the molar ratio of EDTA to iron is 1.1:1, then filter to obtain the filtrate and residue, the residue is iron cement , the percentage of filtrate water-soluble vanadium accounting for the total weight of vanadium in the vanadium slag is 96%, and the percentage of water-soluble iron accounting for the total weight of iron in the vanadium slag is 27%;

(5) Precipitation of vanadium: pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 1.3 and the temperature to 40°C to precipitate the vanadium in the filtrate, and burn at 220°C for 70min to obtain vanadium pentoxide In this step, the vanadium precipitated in the form of vanadium pentoxide accounts for 99% of the total weight of vanadium in the filtrate; the iron precipitated in the form of iron oxide accounts for 0.0005% of the total weight of iron in the filtrate.

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the mother liquor of vanadium precipitation, adjust the pH to 6.8, and burn the mother liquor at 520°C for 40 minutes to obtain iron oxide; cool the gaseous substance produced during the burning process , to obtain ammonium sulfate and potassium ammonium sulfate mixture, which is recycled to step (2) for reuse.

After testing, the product vanadium pentoxide has a weight purity of 98.7%; iron oxide has a weight purity of 99.1%, and its crystal form is nano iron oxide.

Example 3:

(1) Crushing and grinding: the vanadium slag containing 30% by weight of iron and 0.8% by weight of vanadium is crushed and ground to obtain a powder with a diameter of 100 μm;

(2) Mixing: According to the weight ratio of vanadium slag powder: ammonium sulfate: potassium ammonium sulfate = 1:12:2, weigh the raw materials, and mix the vanadium slag powder with ammonium sulfate and potassium ammonium sulfate evenly;

(3) Melting: raise the temperature of the above-mentioned mixed material to 400°C and keep it warm for 10 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: Dissolve the block solid obtained above in an aqueous solution of EDTA with a concentration of 0.1mol/L, and the molar ratio of EDTA to iron is 0.8:1, then filter to obtain the filtrate and residue, the residue is iron cement , the percentage of filtrate water-soluble vanadium accounting for the total weight of vanadium in the vanadium slag is 93%, and the percentage of water-soluble iron accounting for the total weight of iron in the vanadium slag is 15%;

(5) Precipitation of vanadium: pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 2.7 and the temperature to 70°C to precipitate the vanadium in the filtrate, and burn at 360°C for 30min to obtain vanadium pentoxide In this step, the vanadium precipitated in the form of vanadium pentoxide accounts for 99.8% of the total weight of vanadium in the filtrate; the iron precipitated in the form of iron oxide accounts for 0.0001% of the total weight of iron in the filtrate.

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the mother liquor of vanadium precipitation, adjust the pH to 7.5, and burn the mother liquor at 400°C for 50 minutes to obtain iron oxide; cool the gaseous substance produced during the burning process , to obtain ammonium sulfate and potassium ammonium sulfate mixture, which is recycled to step (2) for reuse.

After testing, the product vanadium pentoxide has a weight purity of 99%; iron oxide has a weight purity of 99.2%, and its crystal form is nano iron oxide.

Example 4:

(1) Crushing and grinding: the vanadium slag containing 26% by weight of iron and 1.5% by weight of vanadium is crushed and ground to obtain a powder with a diameter of 100 μm;

(2) Mixing: According to the weight ratio of vanadium slag powder: ammonium sulfate: potassium ammonium sulfate = 1:8:4, weigh the raw materials, and mix the vanadium slag powder with ammonium sulfate and potassium ammonium sulfate evenly;

(3) Melting: raise the temperature of the above-mentioned mixed material to 440°C and keep it warm for 30 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: Dissolve the block solid obtained above in an aqueous solution of EDTA with a concentration of 0.3mol/L, and the molar ratio of EDTA to iron is 0.5:1, then filter to obtain the filtrate and residue, the residue is iron cement , the percentage of filtrate water-soluble vanadium accounting for the total weight of vanadium in the vanadium slag is 98%, and the percentage of water-soluble iron accounting for the total weight of iron in the vanadium slag is 8%;

(5) Precipitation of vanadium: pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 1.6 and the temperature to 80°C to precipitate the vanadium in the filtrate, and burn at 230°C for 150min to obtain vanadium pentoxide In this step, the vanadium precipitated in the form of vanadium pentoxide accounts for 99.1% of the total weight of vanadium in the filtrate; the iron precipitated in the form of iron oxide accounts for 0.0003% of the total weight of iron in the filtrate;

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the mother liquor of vanadium precipitation, adjust the pH to 7.0, and burn the mother liquor at 450°C for 30 minutes to obtain iron oxide; cool the gaseous substance produced during the burning process , to obtain ammonium sulfate and potassium ammonium sulfate mixture, which is recycled to step (2) for reuse.

After testing, the product vanadium pentoxide has a weight purity of 98.3%; iron oxide has a weight purity of 99.7%, and its crystal form is nanometer iron oxide.

Example 5:

(1) Crushing and grinding: the vanadium slag containing 21% by weight of iron and 2.0% by weight of vanadium is crushed and ground to obtain a powder with a diameter of 170 μm;

(2) Mixing: According to the weight ratio of vanadium slag powder: ammonium sulfate: potassium ammonium sulfate = 1:5:2, weigh the raw materials, and mix the vanadium slag powder with ammonium sulfate and potassium ammonium sulfate evenly;

(3) Melting: raise the temperature of the above mixed material to 320°C and keep it warm for 45 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: Dissolve the blocky solid obtained above in an aqueous solution of EDTA with a concentration of 0.24mol/L, and the molar ratio of EDTA to iron is 1:1, then filter to obtain the filtrate and residue, the residue is iron cement , the percentage of filtrate water-soluble vanadium accounting for the total weight of vanadium in the vanadium slag is 98%, and the percentage of water-soluble iron accounting for the total weight of iron in the vanadium slag is 30%;

(5) Precipitation of vanadium: pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 2.0 and the temperature to 50°C to precipitate the vanadium in the filtrate, and burn at 300°C for 60min to obtain vanadium pentoxide In this step, the vanadium precipitated in the form of vanadium pentoxide accounts for 99.9% of the total weight of vanadium in the filtrate; the iron precipitated in the form of iron oxide accounts for 0.0002% of the total weight of iron in the filtrate;

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the vanadium-precipitated mother liquor, adjust the pH to 7.0, and burn the mother liquor at 420°C for 45 minutes to obtain iron oxide; cool the gaseous substances produced during the burning process , to obtain ammonium sulfate and potassium ammonium sulfate mixture, which is recycled to step (2) for reuse.

After testing, the product vanadium pentoxide has a weight purity of 99.8%; iron oxide has a weight purity of 99%, and its crystal form is nanometer iron oxide.

Embodiment 6:

(1) Crushing and grinding: the vanadium slag containing 27% by weight of iron and 2.8% by weight of vanadium is crushed and ground to obtain a powder with a diameter of 160 μm;

(2) Mixing: According to the weight ratio of vanadium slag powder: ammonium sulfate: potassium ammonium sulfate = 1:5:2, weigh the raw materials, and mix the vanadium slag powder with ammonium sulfate and potassium ammonium sulfate evenly;

(3) Melting: heat the above-mentioned mixed material to 420°C and keep it warm for 45 minutes to obtain massive solid and ammonia gas;

(4) Dissolving and filtering: Dissolve the blocky solid obtained above in an aqueous solution of EDTA with a concentration of 0.26mol/L, and the molar ratio of EDTA to iron is 1:1, then filter to obtain the filtrate and residue, the residue is iron cement , the percentage of filtrate water-soluble vanadium accounting for the total weight of vanadium in the vanadium slag is 99%, and the percentage of water-soluble iron accounting for the total weight of iron in the vanadium slag is 1.5%;

(5) Precipitation of vanadium: Pass the ammonia gas obtained in step (3) into the above-mentioned filtrate, and control the pH to 2.0 and the temperature to 75°C to precipitate the vanadium in the filtrate, and burn at 300°C for 100min to obtain vanadium pentoxide In this step, the vanadium precipitated in the form of vanadium pentoxide accounts for 99.3% of the total weight of vanadium in the filtrate; the iron precipitated in the form of iron oxide accounts for 0.0002% of the total weight of iron in the filtrate;

(6) Preparation of iron oxide: pass the ammonia gas obtained in step (3) into the vanadium-precipitated mother liquor, adjust the pH to 7.0, and burn the mother liquor at 420°C for 45 minutes to obtain iron oxide; cool the gaseous substances produced during the burning process , to obtain ammonium sulfate and potassium ammonium sulfate mixture, which is recycled to step (2) for reuse.

After testing, the product vanadium pentoxide has a weight purity of 99.8%; iron oxide has a weight purity of 99%, and its crystal form is nanometer iron oxide.

EDTA is ethylenediaminetetraacetic acid or its disodium salt.

The invention carries out a high-efficiency vanadium extraction process through a low-pollution approach, and the effect is obvious, which well solves the problems of high pollution and low efficiency in the previous vanadium extraction process, and is beneficial to popularization and application.

Claims (5)

1. the method for comprehensive utilization of a vanadium slag is characterized in that carrying out according to the following steps:

⑴ fragmentation and grinding: the powder that vanadium slag is obtained diameter 70～170 μ m through broken and grinding;

⑵ batch mixing: vanadium slag powder and ammonium sulfate and ammonium-potassium sulfate are mixed, and mixing of materials is the vanadium slag powder by weight percentage: ammonium sulfate: ammonium-potassium sulfate=1:5～12:2～5;

⑶ melting: the material of above-mentioned mixing is warming up to 270～440 ℃ and be incubated 10～45min, obtains blocks of solid and ammonia;

⑷ dissolving and filtering: obtain blocks of solid to place concentration be that the aqueous solution of the EDTA of 0.1～0.3mol/L dissolves above-mentioned, make iron and EDTA in the blocks of solid that chelatropic reaction occur, form stable inner complex, and the mol ratio of the iron in EDTA and the blocks of solid is 0.5～1.1:1, then filter and obtain filtrate and residue, residue is iron cement;

⑸ the precipitation of vanadium: pass into the ammonia that step ⑶ obtains in above-mentioned filtrate, and control pH is 1.3～2.7, temperature is 40～80 ℃, makes the vanadium precipitation in the filtrate, and at 220～360 ℃ of calcination 30～150min, obtains Vanadium Pentoxide in FLAKES;

⑹ the preparation of ferric oxide: pass into the ammonia that step ⑶ obtains in the mother liquor of vanadium precipitation, regulating pH is 6.8～7.5, and with mother liquor at 400～520 ℃ of calcination 30～60min, obtain ferric oxide; Gaseous substance cooling with producing in the calcination process obtains ammonium sulfate and ammonium-potassium sulfate mixture, and this mixture is recycled to step ⑵ and recycles.

2. the method for comprehensive utilization of a kind of vanadium slag according to claim 1, it is characterized in that: the vanadium slag described in " ⑴ step ", the weight percent of iron are 20%～30%, the weight percent of vanadium is 0.8%～3.0%.

3. the method for comprehensive utilization of a kind of vanadium slag according to claim 1, it is characterized in that: in the filtrate of described step ⑷, water-soluble vanadium accounts for the per-cent of the gross weight of Vanadium in Vanadium Residue 〉=93%, and water-soluble iron accounts for the per-cent of the gross weight of iron in the vanadium slag≤30%.

4. the method for comprehensive utilization of a kind of vanadium slag according to claim 1 is characterized in that: account for the per-cent of vanadium gross weight in the filtrate 〉=99% with the vanadium of Vanadium Pentoxide in FLAKES form precipitation among the described step ⑸; Account for the per-cent of iron gross weight in the filtrate≤0.0005% with the iron of form of iron oxide precipitation.

5. the method for comprehensive utilization of a kind of vanadium slag according to claim 1 is characterized in that: Vanadium Pentoxide in FLAKES weight purity 〉=98%; Ferric oxide weight purity 〉=99%, its crystal formation are nano-sized iron oxide.

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