CN113088712A - Method for extracting vanadium from vanadium slag by water leaching through large-scale treatment of vanadium slag - Google Patents

Method for extracting vanadium from vanadium slag by water leaching through large-scale treatment of vanadium slag Download PDF

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CN113088712A
CN113088712A CN202110358245.1A CN202110358245A CN113088712A CN 113088712 A CN113088712 A CN 113088712A CN 202110358245 A CN202110358245 A CN 202110358245A CN 113088712 A CN113088712 A CN 113088712A
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vanadium
vanadium slag
slag
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powder
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岳宏瑞
程功金
刘建兴
薛向新
张卫军
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Northeastern University China
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/005—Preliminary treatment of scrap
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/20—Obtaining niobium, tantalum or vanadium
    • C22B34/22—Obtaining vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The invention relates to a method for extracting vanadium from vanadium slag by water leaching of the vanadium slag through large-scale treatment, which comprises the following steps: s1, mixing the vanadium slag with the grain size of more than kilogram and sodium peroxide, and grinding the mixture to the grain size of less than 50 mu m to obtain powder; s2, briquetting the uniformly mixed vanadium slag and sodium peroxide powder under the pressure of 10-15 MPa to obtain a plurality of blocks; s3, roasting the blocks in air to oxidize trivalent vanadium in the blocks into pentavalent vanadium; and S4, grinding the blocks again to obtain clinker powder, and leaching the clinker powder in water to obtain a vanadium-containing aqueous solution. According to the method, the sodium peroxide is adopted to replace the traditional sodium salt, and the low-valence vanadium in the vanadium slag is more fully and completely oxidized by using oxygen generated by thermal decomposition of the sodium peroxide, so that the salt forming rate of vanadate and the recovery rate of vanadium extracted by water are improved. The method is particularly suitable for extracting vanadium from large-amount vanadium slag, reducing the vanadium slag and recycling the vanadium slag.

Description

Method for extracting vanadium from vanadium slag by water leaching through large-scale treatment of vanadium slag
Technical Field
The invention relates to the technical field of vanadium extraction from vanadium slag, in particular to a method for extracting vanadium from vanadium slag by water leaching through large-scale treatment of the vanadium slag.
Background
The vanadium slag is a byproduct of smelting vanadium-titanium magnetite in a blast furnace-converter process, and contains a large amount of recyclable vanadium. Vanadium is mainly in low valence state (V) in the vanadium-chromium slag3+) With spinel phase (FeV)2O4) In (1). At present, the sodium roasting-leaching process is a process for treating vanadium slag with the most extensive practical application. The main process is as follows: mixing vanadium slag with sodium salt (such as sodium carbonate, etc.), and calcining in air to obtain vanadium slag V3+Is oxidized to V5+Then carrying out salt-forming reaction with sodium salt to generate sodium vanadate, and leaching the roasted clinker with water to obtain a vanadium-containing aqueous solution. The vanadium suboxides in the vanadium slag can react with additives to generate vanadate (such as sodium vanadate) after being oxidized to vanadium pentaoxides, and then the vanadate can be recovered in the subsequent leaching treatment. The oxidation process of the vanadium slag is a limiting link of the roasting process and is also a main control factor of the vanadium recovery rate in the actual production.
In actual production compared to laboratory studies, the recovery of vanadium was much lower (at least 10% lower) than in the laboratory despite similar calcination conditions. In a rotary kiln for actual production, the mass of vanadium slag can reach the level of several tons, and in a muffle furnace of a laboratory, the mass of the vanadium slag is generally between dozens of grams and 100 grams. Although the air atmosphere is the same in the rotary kiln and the muffle furnace in the macroscopic view, most of vanadium slag particles in the rotary kiln are in an oxygen-deficient state in the microscopic view, so that the overall oxidation rate of large-volume vanadium slag is too low. The laboratory vanadium slag is usually less than 100g, so that trivalent vanadium in the laboratory vanadium slag can be easily oxidized as completely as possible, and the oxidation difficulty is high for large-amount vanadium slag. The amount of vanadium slag treated in a laboratory is very small, the method cannot be applied to actual production, and the recovery rate of vanadium in actual production can be improved only by improving the overall oxidation rate of large-volume vanadium slag. In addition, the particle size and the air permeability of the vanadium slag in actual production are a pair of production parameters which are mutually restricted. When the vanadium slag particles are small, the vanadium slag can be fully oxidized during roasting, and further the recovery rate of vanadium is increased. However, when the vanadium slag particles are too small, the vanadium slag in the kiln is very densely stacked, the air permeability is very poor, and the oxidation rate of the vanadium slag located at the middle position of the stack is low, so that the overall oxidation rate of a large amount of vanadium slag in one batch is still low, and the recovery rate of vanadium is reduced.
Disclosure of Invention
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a method for leaching vanadium from vanadium slag through water in large-scale treatment of the vanadium slag, which is used for improving the recovery rate of vanadium in large-volume vanadium slag in industrial application.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a method for extracting vanadium from vanadium slag by water leaching through large-scale treatment of the vanadium slag comprises the following steps:
s1, mixing the vanadium slag with the grain size of more than kilogram and sodium peroxide, and grinding the mixture to the grain size of less than 50 mu m to obtain powder;
s2, briquetting the uniformly mixed vanadium slag and sodium peroxide powder under the pressure of 10-15 MPa to obtain a plurality of blocks;
s3, roasting the blocks in air to oxidize trivalent vanadium in the blocks into pentavalent vanadium;
and S4, grinding the blocks again to obtain clinker powder, and leaching the clinker powder in water to obtain a vanadium-containing aqueous solution.
Wherein, the kilogram level refers to that the amount of the vanadium slag is more than 1kg to hundreds of kg, even per ton. The method is different from laboratory pilot-scale tests, is used for reducing and extracting vanadium from the byproduct vanadium slag of the vanadium titano-magnetite smelting in a large-volume blast furnace/converter, and realizes resource utilization of the byproduct of the vanadium titano-magnetite smelting.
According to a preferred embodiment of the present invention, in S1, V is converted from vanadium in vanadium slag2O5Sodium peroxide and V in vanadium slag2O5The molar ratio of (A) to (B) is 2-4: 1. Mole of sodium peroxideThe dosage needs to ensure that powder particles of the vanadium slag can directly contact with sodium peroxide, and the sodium peroxide releases O2Capable of directly oxidizing adjacent low-valence vanadium, O2Pores and channels are generated in the process of overflowing to the outside of the block body, and the oxygen in the air is promoted to diffuse to the inside and the center of the block body. Because the oxygen released by the sodium peroxide is quickly utilized, the overflowing amount of the oxygen is reduced, and the utilization rate of the oxygen in the calcium peroxide is improved, so that the V in the clinker is reduced2O5The calcium vanadate can be completely salified as far as possible. The amount of sodium peroxide and V in the vanadium slag2O5The molar ratio of (a) to (b) is 2-4: 1, more preferably 3: 1. The sodium peroxide dosage is too little to be unfavorable for improving the water leaching rate of vanadium, and its dosage is too high not only extravagant, and too much sodium peroxide can make the grog melting point reduce, produces a large amount of liquid phases, wraps up on vanadium slag granule surface, has hindered going on of vanadium slag oxidation and salt forming reaction, and then leads to the vanadium rate of recovery to reduce.
According to a preferred embodiment of the present invention, in S1, it is ground to a particle size of 10 μm or less.
According to the preferred embodiment of the present invention, in S1, the particles are ground to 0.1-1 μm, and more preferably 200-300 nm.
According to a preferred embodiment of the present invention, in S1, the mixture of vanadium slag and sodium peroxide is ground using a high energy ball mill. The mixture of vanadium slag and sodium peroxide can be milled to about 200nm, even to below 100nm, by using a high-energy ball mill.
Generally, the smaller the particle size, the more beneficial the improvement of the oxidation rate of vanadium in the vanadium slag and the water leaching recovery rate, but the smaller the particle size, the more likely fine dust is formed in the production process, the more likely pollution to the production environment is caused, and the cost and equipment are considered, and the mixture of the vanadium slag and the sodium peroxide is preferably ground to 0.1-50 μm, more preferably 0.1-1 μm.
According to a preferred embodiment of the present invention, in S2, the size of the block is 0.5 to 10cm, preferably 0.5 to 5 cm. The specific shape of the block is not limited, and the block can be a regular cylinder, a rectangular body, an ellipsoid, a sphere or an irregular solid shape. Wherein the pressure in the briquetting process is 10-15 MPa, and the pressing time is 5-7 min. Wherein the preferable pressure is 10MPa and the pressing time is 5 min.
Wherein the mass is preferably a mixture of irregularly shaped or different regularly geometrically shaped masses; so a large amount of vanadium slag blocks can be piled up in the kiln in a multi-gap manner, the air permeability is better, and the heat is easier to diffuse in the whole piled body, thereby being beneficial to the oxidation of the vanadium slag on the surface of the blocks.
The briquetting is prepared by filling materials in a die and continuously pressurizing for a preset time by adopting a pressure head which is adaptive to the inner cavity of the die, and the pressurizing size of the briquetting determines the compactness between vanadium slag powder particles and sodium peroxide powder particles in the block and the mass transfer and heat transfer properties in the block. The briquetting pressure is too small, the tightness between the vanadium slag particles and the sodium peroxide particles in the briquetting is poor, the internal heat transfer and mass transfer are poor, and trivalent vanadium in the vanadium slag is not favorably oxidized into high-valence vanadium. For example, the disk type pelletizer forms balls or agglomerates, the particles inside the pellets are loose, and the heat conductivity and the mass transfer are insufficient. The briquetting pressure should not be too big yet, and on the one hand, the compactness of block no longer changes along with pressure increase, and on the other hand, pressure is big to the equipment requirement height, and gives the increase cost of smashing once more and levigating after the calcination.
According to the preferred embodiment of the invention, in S3, the roasting temperature is 800-850 ℃, preferably 820-830 ℃, and the roasting time is 2-2.5 h, preferably 2 h. The roasting temperature has low requirement on equipment, and the energy consumption is saved.
According to the preferred embodiment of the invention, in the step S4, the water leaching temperature is 75-85 ℃.
According to the preferred embodiment of the invention, in the step S4, the water immersion time is 2-2.5 h.
According to the steps S1-S3, clinker powder with high vanadium oxidation rate and small vanadium slag particle size can be obtained, so that vanadium can be smoothly leached in the water leaching of S4, and high vanadium recovery rate is obtained.
(III) advantageous effects
The invention has the beneficial effects that:
(1) according to the invention, sodium peroxide is adopted to replace the traditional sodium salt, oxygen generated by thermal decomposition of the sodium peroxide is used for oxidizing low-valence vanadium in the vanadium slag, and sodium oxide generated by decomposition of the sodium peroxide and high-valence vanadium are used for producing sodium vanadate so as to be dissolved out in the water immersion treatment process.
(2) The vanadium slag and the sodium peroxide are ground to be very fine, then the vanadium slag and the sodium peroxide are briquetted under specific pressure, vanadium slag particles and the sodium peroxide particles are fully mixed and closely contacted, the sodium peroxide with fine particle size (less than 50 mu m) can be rapidly decomposed and release oxygen, the oxygen is contacted with the peripheral vanadium slag particles and rapidly oxidizes low-valence vanadium into high-valence vanadium, the efficiency of oxidizing the vanadium slag by the sodium peroxide is improved, the probability that the oxygen generated by thermal decomposition of the sodium peroxide overflows to the outside is reduced, and the recovery rate of the vanadium in the vanadium slag is improved.
(3) For treating large amount of vanadium slag, the vanadium slag and sodium peroxide are levigated and pressed into blocks to be accumulated in the kiln, so that the transmission and diffusion of ventilation and heat in the whole kiln are facilitated, the conflict between the granularity of materials and the overall ventilation property is solved, the low-valence vanadium on the surfaces of the blocks is effectively ensured to be fully oxidized into high-valence vanadium, and the recovery rate of the vanadium in the vanadium slag is improved.
Drawings
FIG. 1 is an EPMA image of a fired block of example 1 of the present invention.
FIG. 2 is data of the water leaching rate of vanadium in examples 1 to 3 of the present invention.
FIG. 3 is data of water leaching rates of vanadium in examples 2, 4, 5 of the present invention and comparative example 5.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
In each of the following examples and comparative examples, the mass fraction of vanadium in an aqueous solution was measured using ICP-OES (inductively coupled plasma emission spectrometer).
Example 1
The embodiment provides a method for extracting vanadium from vanadium slag by water leaching of vanadium slag through large-scale treatment, which comprises the following steps:
s1, mixing 358.2 g of Na2O2The powder was mixed with 5kg of vanadium slag (containing V as the amount of vanadium)2O5Calculated as 8.34%) combined (Na)2O2V in vanadium slag2O5At a molar ratio of about 2:1) were mixed in a mixing bowl for 10 hours to mix the two powders uniformly. And (3) ball-milling the mixed powder in a high-energy ball mill for 10 hours to ensure that the particle size of the powder is 200-400 nm.
And S2, pressing the mixture into blocks in a stainless steel die with the inner diameter of 3cm, wherein the pressure in the pressing process is 10MPa, and the pressing time is 5 min. After demoulding, a block with a diameter of 3cm and a thickness of about 1cm is obtained.
And S3, raising the temperature of the muffle furnace to 800 ℃, keeping the temperature constant, and putting the block in the S2 into the muffle furnace to start roasting. After keeping the temperature for 2h, the block is taken out and rapidly cooled in the air. The block was cut in the radial direction and the cut surface was polished smooth using sandpaper. Sections were characterized using EPMA, resulting in EPMA images of the mass shown in fig. 1.
S4, crushing the roasted blocks in a sampling machine for 120S to obtain clinker powder, and soaking the clinker powder in water at 80 ℃ for 2 h. The vanadium content in the water leachate was measured and the calculated recovery rate was about 70% in combination with the vanadium content in the vanadium slag (left side point shown in fig. 2).
Example 2
The embodiment provides a method for extracting vanadium from vanadium slag by water leaching of vanadium slag through large-scale treatment, which comprises the following steps:
s1, 537.0 g of Na2O2The powder was mixed with 5kg vanadium slag (Na)2O2V in vanadium slag2O5About 3:1) were mixed in a compounding tank for 10 hours to mix the two powders uniformly. And (3) ball-milling the mixed powder in a high-energy ball mill for 10 hours to ensure that the particle size of the powder is 200-400 nm.
And S2, pressing the mixture into blocks in a stainless steel die with the inner diameter of 3cm, wherein the pressure in the pressing process is 10MPa, and the pressing time is 5 min. After demoulding, a block with a diameter of 3cm and a thickness of about 1cm is obtained.
And S3, raising the temperature of the muffle furnace to 800 ℃, keeping the temperature constant, and putting the block in the S2 into the muffle furnace to start roasting. After keeping the temperature for 2h, the block is taken out and rapidly cooled in the air.
S4, crushing the roasted blocks in a sampling machine for 120S to obtain clinker powder, and soaking the clinker powder in water at 80 ℃ for 2 h. The vanadium content in the water leachate was measured and the recovery rate was calculated to be 90% in combination with the vanadium content in the vanadium slag (middle point shown in fig. 2, 3).
Example 3
The embodiment provides a method for extracting vanadium from vanadium slag by water leaching of vanadium slag through large-scale treatment, which comprises the following steps:
s1, mixing 715.5 g of Na2O2The powder was mixed with 5Kg of vanadium slag (Na)2O2V in vanadium slag2O5About 4:1) were mixed in a compounding tank for 10 hours to mix the two powders uniformly. And (3) ball-milling the mixed powder in a high-energy ball mill for 10 hours to ensure that the particle size of the powder is 200-400 nm.
And S2, pressing the mixture into blocks in a stainless steel die with the inner diameter of 3cm, wherein the pressure in the pressing process is 10MPa, and the pressing time is 5 min. After demoulding, a block with a diameter of 3cm and a thickness of about 1cm is obtained.
And S3, raising the temperature of the muffle furnace to 800 ℃, keeping the temperature constant, and putting the block in the S2 into the muffle furnace to start roasting. After keeping the temperature for 2h, the block is taken out and rapidly cooled in the air.
S4, crushing the roasted blocks in a sampling machine for 120S to obtain clinker powder, and soaking the clinker powder in water at 80 ℃ for 2 h. The vanadium content in the water leachate was measured and the recovery rate was calculated as 70% in combination with the vanadium content in the vanadium slag (right side point shown in fig. 2).
Example 4
The embodiment provides a method for extracting vanadium from vanadium slag by water leaching of vanadium slag through large-scale treatment, which comprises the following steps:
s1, 537.1 g of Na2O2The powder was mixed with 5Kg of vanadium slag (Na)2O2V in vanadium slag2O5About 3:1) were mixed in a compounding tank for 10 hours to mix the two powders uniformly. And (3) ball-milling the mixed powder in a high-energy ball mill for 10 hours to ensure that the particle size of the powder is 200-400 nm.
And S2, pressing the mixture into blocks in a stainless steel die with the inner diameter of 3cm, wherein the pressure in the pressing process is 10MPa, and the pressing time is 5 min. After demoulding, a block with a diameter of 3cm and a thickness of about 1cm is obtained.
And S3, raising the temperature of the muffle furnace to 850 ℃, keeping the constant temperature, and putting the block in the S2 into the muffle furnace to start roasting. After keeping the temperature for 2h, the block is taken out and rapidly cooled in the air.
S4, crushing the roasted blocks in a sampling machine for 120S to obtain clinker powder, and soaking the clinker powder in water at 80 ℃ for 2 h. The vanadium content in the water leachate was measured and the recovery rate was calculated in combination with the vanadium content in the vanadium slag, and was about 91% (as shown in fig. 3).
Example 5
The embodiment provides a method for extracting vanadium from vanadium slag by water leaching of vanadium slag through large-scale treatment, which comprises the following steps:
s1, 537.1 g of Na2O2The powder was mixed with 5Kg of vanadium slag (Na)2O2V in vanadium slag2O5About 3:1) were mixed in a compounding tank for 10 hours to mix the two powders uniformly. And (3) ball-milling the mixed powder in a high-energy ball mill for 10 hours to ensure that the particle size of the powder is 200-400 nm.
And S2, pressing the mixture into blocks in a stainless steel die with the inner diameter of 3cm, wherein the pressure in the pressing process is 15MPa, and the pressing time is 5 min. After demoulding, a block with a diameter of 3cm and a thickness of about 1cm is obtained.
And S3, raising the temperature of the muffle furnace to 900 ℃, keeping the temperature, and putting the block in the S2 into the muffle furnace to start roasting. After keeping the temperature for 2h, the block is taken out and rapidly cooled in the air.
S4, crushing the roasted blocks in a sampling machine for 120S to obtain clinker powder, and soaking the clinker powder in water at 80 ℃ for 2 h. The vanadium content in the water leachate was measured and the recovery was calculated as about 92% in combination with the vanadium content in the vanadium slag (right side point shown in fig. 3).
Comparative example 1
Comparative example is based on example 2, and Na2O2The powder was adjusted to 86.3g, which was associated with V in the vanadium slag2O5The molar ratio is about 0.5: 1. Other conditions were the same as in example 2.
And detecting the content of vanadium in the water leachate, and calculating the recovery rate of vanadium in the vanadium slag to be 64.5%.
Comparative example 2
Comparative example is based on example 2, and Na2O2The powder was adjusted to 258.5g, which was associated with V in the vanadium slag2O5The molar ratio is about 1.5: 1. Other conditions were the same as in example 2. And detecting the content of vanadium in the water leachate, and calculating the recovery rate of vanadium in the vanadium slag to be 66.3%.
Comparative example 3
Comparative example is based on example 2, and Na2O2The powder and vanadium slag are ground to a particle size of 100 to 150 mesh (about 100 to 150 μm) by a common grinder. Other conditions were the same as in example 2. And detecting the content of vanadium in the water leachate, and calculating the recovery rate of vanadium in the vanadium slag to be 63.9%.
Comparative example 4
Comparative example is based on example 2, and Na2O2And (3) ball-milling the powder and the vanadium slag in a high-energy ball mill for 10 hours to ensure that the particle size of the powder is 200-400 nm. Pressing into blocks in a stainless steel mold with an inner diameter of 3cm, wherein the pressure in the pressing process is 2MPa, and the pressing time is 5 min. Other conditions were the same as in example 2. And detecting the content of vanadium in the water leachate, and calculating the recovery rate of vanadium in the vanadium slag to be 65.2%.
In addition, when balls with a diameter of 3cm were prepared using a disc tumbler instead of the briquettes in comparative example 4, the recovery rate of vanadium in the vanadium slag was less than 60% under the same conditions as in example 2.
Comparative example 5
The comparative example is based on example 2, the roasting temperature is reduced to 700 ℃, and the constant temperature roasting is carried out for 2 hours. Other conditions were the same as in example 2. And detecting the content of vanadium in the water leachate, and calculating the recovery rate of vanadium in the vanadium slag to be about 67% (shown as a left point in figure 3).
As can be seen from FIG. 1, pores appear in the briquette-fired block, and these pores are represented by Na2O2Decomposition by heating to give O2And the result is that. O is2The vanadium slag can be oxidized along the way when the vanadium slag is diffused to the outside of the block. Na (Na)2O2V in vanadium slag2O5The recovery rate of vanadium is the greatest when the molar ratio of (A) to (B) is 3: 1. The roasting temperature is increased from 700 ℃ to 800 ℃, and the recovery rate of vanadium is obviously increased; the temperature of the roasting is continuously raised, and the roasting temperature is continuously raised,the recovery rate of vanadium remains substantially unchanged.
In the present invention, Na2O2V in vanadium slag2O5The parameters such as the molar ratio, the particle fineness, the briquetting pressure, the roasting temperature, the roasting time and the like have certain influence on the vanadium recovery rate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A method for extracting vanadium from vanadium slag by water leaching through large-scale treatment of the vanadium slag is characterized by comprising the following steps:
s1, mixing the vanadium slag with the grain size of more than kilogram and sodium peroxide, and grinding the mixture to the grain size of less than 50 mu m to obtain powder;
s2, briquetting the uniformly mixed vanadium slag and sodium peroxide powder under the pressure of 10-15 MPa to obtain a plurality of blocks;
s3, roasting the blocks in air to oxidize trivalent vanadium in the blocks into pentavalent vanadium;
and S4, grinding the blocks again to obtain clinker powder, and leaching the clinker powder in water to obtain a vanadium-containing aqueous solution.
2. The method according to claim 1, wherein in S1, V is converted from vanadium in vanadium slag2O5Sodium peroxide and V in vanadium slag2O5The molar ratio of (A) to (B) is 2-4: 1.
3. The method according to claim 1, wherein in S1, the particles are ground to a particle size of 10 μm or less.
4. The method of claim 3, wherein in S1, the particles are ground to 200-300 nm.
5. The method according to claim 4, characterized in that the mixture of vanadium slag and sodium peroxide is ground using a high energy ball mill.
6. The method according to claim 1, wherein in S2, the size of the block is 0.3-5 cm; the pressure in the briquetting process is 10-15 MPa, and the pressing time is 5-7 min.
7. The method of claim 1, wherein in S2, the mass is a mixture of irregularly shaped or different regularly geometrically shaped masses.
8. The method according to claim 1, wherein in S3, the roasting temperature is 800-850 ℃ and the roasting time is 2-2.5 h.
9. The method as claimed in claim 1, wherein in S4, the leaching temperature is 75-85 ℃, and the water leaching time is 2-2.5 h.
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