KR102637646B1 - Roasting additive composition for recovering vanadium from a vanadium-bearing magnetite ore - Google Patents

Abstract

The present invention provides a roasting additive composition for vanadium recovery from havanadium ore that minimizes the additive composition and maximizes vanadium recovery through a dry roasting process.

Description

Roasting additive composition for recovering vanadium from havanadium ore {ROASTING ADDITIVE COMPOSITION FOR RECOVERING VANADIUM FROM A VANADIUM-BEARING MAGNETITE ORE}

The present invention relates to a roasting additive composition for vanadium recovery from havanadium ore that minimizes the additive composition and maximizes vanadium recovery through a dry roasting process.

The process of recovering vanadium from havanadium ore is largely divided into a dry smelting process and a dry roasting process. However, the dry smelting process also inputs vanadium-enriched slag back into the dry roasting process, so the final process for recovering vanadium can be summarized as a single dry roasting process.

The dry roasting process is a process in which havanadium ore is roasted at high temperature in a rotary kiln. It is generally reported that vanadium is leached by adding sodium carbonate (Na ₂ CO ₃ ) to form sodium vanadate (NaVO ₃ ). . At this time, when sodium carbonate (Na ₂ CO ₃ ) is used, the additive composition is as high as 30 wt%, and a viscoelastic material is formed due to slagging of sodium carbonate (Na ₂ CO ₃ ) during the reaction, and the rotary operation process is a continuous operation process. A problem arises where low viscosity and sticky substances are formed inside the kiln, impeding operability.

In order to solve this inhibition of operation and reduce the absolute amount of the additive composition, a new roasting additive was considered. Sodium sulfate (Na ₂ SO ₄ ) forms sulfur dioxide (SO ₂ ) gas at a temperature of 1050 ℃ or higher and does not form slagging. We attempted to apply it to the vanadium dry roasting process by taking advantage of its advantages.

Through painstaking efforts and various researches, the present applicant produced pellets by mixing a mixture of sodium carbonate (Na2CO3) and sodium sulfate (Na2SO4) with hambanadium ore as a roasting additive, and then performed soda roasting, crushing, and water leaching processes under high temperature conditions. The present invention was completed by obtaining a roasting additive composition for recovering vanadium from havanadium ore that efficiently recovers vanadium.

Republic of Korea Patent No. 10-1996425 (Patent registration date: June 28, 2019)

Accordingly, an object of the present invention is to provide a roasting additive composition for vanadium recovery from havanadium ore.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problem, according to one aspect of the present invention,

The present invention is a roasting additive composition for recovering vanadium from havanadium ore,

The composition of the roasting additive may be a mixture of sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ).

According to one embodiment of the present invention, the composition of the roasting additive is,

It may be characterized as containing 10 to 30 wt% of sodium carbonate (Na ₂ CO ₃ ) and 1 to 10 wt% of sodium sulfate (Na ₂ SO ₄ ).

According to one embodiment of the present invention, the hambanadium ore contains impurities,

The impurities include iron (Fe), sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), titanium (Ti), chromium (Cr), manganese (Mn), nickel (Ni), and cadmium ( It may include at least one selected from Cd), barium (Ba), silver (Ag), gallium (Ga), silicon (Si), aluminum (Al), vanadium (V), and cobalt (Co).

According to one embodiment of the present invention, the mixture containing the additive is,

It may be characterized as being manufactured as pellets with a size of 0.1 to 30 mm.

According to one embodiment of the present invention, the mixture is,

It is carried out through a roasting process,

The reaction time may be 30 minutes to 6 hours or less.

According to one embodiment of the present invention, the roasting process temperature is,

It may be 1050 to 1200°C or lower.

According to one embodiment of the present invention, the mixture after the roasting reaction is,

It is crushed to create particles with a particle diameter of less than 100 μm.

It may be characterized by producing vanadium leachate through a water leaching process.

According to one embodiment of the present invention, the water leaching process temperature is,

Room temperature to 95°C,

The water leaching time can be from 10 minutes to 4 hours.

According to one embodiment of the present invention, the water leached aqueous solution is,

The water leached aqueous solution can be reused in the water leaching process.

According to the present invention, the optimal roasting additive composition for vanadium recovery from havanadium ore is provided, thereby improving operability by minimizing the formation of low-viscosity and sticky substances, and improving vanadium recovery due to reaction between liquid-solid and gas-solid. All vanadium recovery due to reaction can be achieved, thereby maximizing the vanadium recovery rate.

As a result, it can be expected that the amount of roasting additive required to achieve the same vanadium recovery rate is reduced to 50% or less.

Figure 1 is a dry roasting process diagram for vanadium recovery according to an embodiment of the present invention.
Figure 2 is a graph showing the results of vanadium recovery after roasting/water leaching when sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ) were used together as composition additives according to an embodiment of the present invention.
_{Figure 3} shows _the roasting _/ This is a graph of vanadium recovery rate results after water leaching.
Figure 4 shows the vanadium recovery rate after roasting/water leaching according to temperature when only sodium carbonate (Na ₂ CO ₃ ) according to a comparative example of the present invention is used as a composition additive and sodium carbonate (Na ₂ CO ₃ ) is 30 wt%. This is the result graph.
Figure 5 shows the results of vanadium recovery rate after roasting/water leaching according to the addition of sodium sulfate (Na ₂ SO ₄ ) (wt%) and temperature when only sodium sulfate (Na ₂ SO ₄ ) according to a comparative example of the present invention was used as a composition additive. It's a graph.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

The advantages and features of the present invention and how to achieve it will become clear by referring to the embodiments described in detail below along with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, but the present embodiments only serve to ensure that the disclosure of the present invention is complete and are within the scope of common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Additionally, in describing the present invention, if it is determined that related known techniques may obscure the gist of the present invention, detailed description thereof will be omitted.

Hereinafter, the present invention will be described in detail.

The present invention provides a roasting additive composition for vanadium recovery from havanadium ore.

The present invention is a roasting additive composition for recovering vanadium from havanadium ore,

The composition of the roasting additive may be a mixture of sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ).

A method of recovering vanadium through a conventional roasting process generally involves adding sodium carbonate (Na ₂ CO ₃ ) to form sodium vanadate (NaVO ₃ ) and water leaching the vanadium. However, when sodium carbonate (Na ₂ CO ₃ ) is added, the added composition is as high as 30 wt% and a viscoelastic material is formed due to slagging during the reaction, forming a low-viscosity and sticky material inside the rotary kiln, which is a continuous operation process. There was a problem that hindered sexuality.

In response, according to the present invention, the optimal roasting additive composition for vanadium recovery from havanadium ore is provided, thereby improving operation efficiency by minimizing the formation of low-viscosity and sticky substances, and vanadium recovery and gas recovery due to the reaction between liquid and solid. -All vanadium recovery due to reactions between solids can be achieved, thereby maximizing the vanadium recovery rate.

As a result, the amount of roasting additive required to achieve the same vanadium recovery rate can be expected to be reduced to 50% or less.

At this time, the additive may be 10 to 30 wt% of sodium carbonate (Na ₂ CO ₃ ) and 1 to 10 wt% of sodium sulfate (Na ₂ SO ₄ ).

Here, by minimizing the amount of sodium carbonate (Na ₂ CO ₃ ) used, process efficiency can be increased by minimizing the formation of low-viscosity viscoelastic material during rotary kiln operation.

Additionally, the mixed addition of sodium sulfate (Na ₂ SO ₄ ) has the advantage of increasing heat transfer efficiency by forming sulfur dioxide (SO ₂ ) gas and not forming slagging under high temperature conditions.

The additive may preferably be 10 to 25 wt% of sodium carbonate (Na ₂ CO ₃ ) and 2 to 10 wt% of sodium sulfate (Na ₂ SO ₄ ), and more preferably 15 to 25 wt% of sodium carbonate (Na ₂ CO ₃ ). % and sodium sulfate (Na ₂ SO ₄ ) may be 2 to 9 wt%.

In addition, the havanadium ore contains iron (Fe), sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), titanium (Ti), chromium (Cr), manganese (Mn), and nickel (Ni). ), cadmium (Cd), barium (Ba), silver (Ag), gallium (Ga), silicon (Si), aluminum (Al), vanadium (V), and cobalt (Co). there is.

At this time, the havanadium ore may be used directly as havanadium titanite (VTM) ore or concentrate, or as slag in which iron is preferentially recovered through a melting process and the vanadium obtained as a by-product may be used.

Additionally, the mixture containing the above additives may be manufactured into pellets of 0.1 to 30 mm.

Here, the pellets are manufactured by a pelletizing method,

The pelletizing method is a method of forming small pellet-type balls by adding a small amount of liquid.

At this time, if the size of the mixture containing the additive is within the above range, it can be easily introduced into the rotary kiln.

Additionally, the mixture is subjected to a roasting process,

The reaction time may be 30 minutes to 6 hours or less.

Here, the roasting process may use at least one selected from oxidation roasting, reduction roasting, soda roasting, and chloride roasting.

At this time, roasting is a process that involves heating at a high temperature below the melting point to change the chemical composition and physical properties that may accompany it, thereby changing it into a form that is easy to process.

Here, oxidation roasting is a complete roasting process in which impurities are partially or completely replaced by oxygen by providing excess oxygen and heat.

In contrast to oxidation roasting, reduction roasting is a method of reducing oxidized light/oxide to a lower oxide or metal state by adding a reducing agent.

In addition, soda roasting is a roasting method mainly using soda ash (sodium carbonate, Na ₂ CO ₃ ), and in many cases, it is converted into a sodium salt form that is soluble in water through the action of sodium (Na).

And, chloride roasting is a method of changing metal chemicals into chloride form by roasting with additives other than ore, similar to soda roasting.

Here, the roasting process is a process of converting vanadium present in titanite into a water-soluble sodium vanadate (NaVO ₃ ) phase using a soda roasting method.

At this time, it is very important to check whether sodium vanadate (NaVO ₃ ) phase is formed.

And, if the reaction time is within the above range,

The formation of sodium vanadate (NaVO ₃ ) through the formation and reaction of liquid sodium carbonate (Na ₂ CO ₃ ) may not be sufficient, so a reaction time of 30 minutes or more is required.

Meanwhile, the longer the reaction time, the more advantageous it is for the formation of sodium vanadate (NaVO ₃ ), but it is disadvantageous in terms of energy efficiency, so it is preferable from an operational point of view to limit the roasting process to a maximum of 5 hours.

Here, the reaction time may be preferably 30 minutes to 5 hours, and more preferably 1 hour to 5 hours.

Additionally, the roasting process temperature may be 1050 to 1200° C. or lower.

At this time, when the roasting process temperature is within the above range, sodium sulfate (Na ₂ SO ₄ ) forms/emitted sulfur dioxide (SO ₂ ) gas through thermal decomposition, and the generated sulfur dioxide (SO ₂ ) gas is combined with vanadium in the havanadium ore. Through the reaction, vanadium recovery can be promoted in the subsequent water leaching process.

Here, the roasting process temperature is preferably 1050 to 1150°C, and more preferably 1070 to 1130°C.

In addition, the roasting process may further include air cooling conditions after reaction.

In addition, the mixture after the roasting reaction is crushed to form particles with a particle size of less than 100 μm, and a vanadium leachate can be produced through a water leaching process.

At this time, the crushing process is a process of lightly crushing the product obtained after reaction in the roasting process into particles, and can be crushed using a rod mill or the like.

Therefore, through the above process, the reaction between particles and aqueous solution can be promoted in the water leaching process.

At this time, the smaller the particle size, the larger the surface area of the roasting product through crushing, which can increase the vanadium leaching rate in the water leaching process.

Additionally, the reason why water leaching is possible is because sodium vanadate (NaVO ₃ ) produced through soda roasting has high solubility in water.

At this time, the ease of the process can be said to be high in that vanadium can be recovered through simple water leaching.

And, the water leaching process temperature is from room temperature to 95 ℃,

The water leaching time can be from 10 minutes to 4 hours.

At this time, the water leaching time may vary depending on the temperature range of the water leaching process, and the water leaching time decreases as the leaching temperature increases.

In addition, a sufficiently high vanadium recovery rate can be achieved in 4 hours at a water leaching temperature of room temperature and 10 minutes in the case of water leaching at 95°C, but the applied water leaching temperature and time can be flexibly adjusted depending on process operating conditions.

Here, the water leaching process temperature is preferably 50 to 95°C, and more preferably 60 to 90°C.

Additionally, when the water leaching time is within the above range, efficient vanadium recovery from water leaching is possible.

At this time, the water leaching time may be preferably 1 to 4 hours, and more preferably 2 to 4 hours.

Additionally, the water leached aqueous solution can be reused in the water leaching process.

At this time, it may be possible to concentrate vanadium from the reused water-leached solution.

Below, the present invention will be described in more detail through examples. However, the following examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.

<Example>

<Example 1> Preparation of roasting additive composition for vanadium recovery from havanadium ore

Vanadium is extracted from hamvanadium ore by mixing 16 g of hamvanadium titanite (VTM) with 2 g (10 wt%) of sodium carbonate (Na ₂ CO ₃ ) and 2 g (10 wt%) of sodium sulfate (Na ₂ SO ₄ ) in a certain weight ratio. A roasting additive composition for recovery was prepared.

<Example 2>

The same method as Example 1 was performed except that 4 g (20 wt%) of sodium carbonate (Na ₂ CO ₃ ) was used.

<Example 3>

The same method as Example 1 was performed except that 6 g (30 wt%) of sodium carbonate (Na ₂ CO ₃ ) was used.

<Example 4>

The same method as Example 1 was performed except that 1 g (5 wt%) of sodium sulfate (Na ₂ SO ₄ ) was used.

<Example 5>

The same method as Example 2 was performed except that 1 g (5 wt%) of sodium sulfate (Na ₂ SO ₄ ) was used.

<Example 6>

The same method as Example 3 was performed except that 1 g (5 wt%) of sodium sulfate (Na ₂ SO ₄ ) was used.

<Comparative example>

<Comparative Example 1>

2 g (10 wt%) of sodium carbonate (Na ₂ CO ₃ ) was added alone to 18 g of hamvanadium titanite (VTM) and mixed at a certain ratio.

<Comparative Example 2>

The same method as Comparative Example 1 was performed, except that 4 g (20 wt%) of sodium carbonate (Na ₂ CO ₃ ) was used.

<Comparative Example 3>

The same method as Comparative Example 1 was performed, except that 6 g (30 wt%) of sodium carbonate (Na ₂ CO ₃ ) was used.

<Comparative Example 4>

The same method as Comparative Example 1 was performed, except that 8 g (40 wt%) of sodium carbonate (Na ₂ CO ₃ ) was used.

<Comparative Example 5>

The same method as Comparative Example 1 was performed, except that 1 g (5 wt%) of sodium sulfate (Na ₂ SO ₄ ) was used instead of sodium carbonate (Na ₂ CO ₃ ).

<Comparative Example 6>

It was performed in the same manner as Comparative Example 1, except that 2 g (10 wt%) of sodium sulfate (Na ₂ SO ₄ ) was used instead of sodium carbonate (Na ₂ CO ₃ ).

<Comparative Example 7>

It was performed in the same manner as Comparative Example 1, except that 3 g (15 wt%) of sodium sulfate (Na ₂ SO ₄ ) was used instead of sodium carbonate (Na ₂ CO ₃ ).

<Experimental example>

<Experimental Example 1> Sodium carbonate (Na ₂ C.O. ₃ ) and sodium sulfate (Na ₂ SO ₄ ) Recovery rate of vanadium after roasting/leaching according to mixing ratio

1. The mixture was placed in a platinum crucible and roasted at a reaction temperature of 1100°C (1373 K) for 4 hours, then taken out and air cooled in a desiccator for 24 hours.

2. The water leaching temperature was set at 90°C and the water leaching reaction was performed by stirring at 200 rpm for 4 hours using a stirrer.

(At this time, the water leaching temperature was room temperature, 60, and 90 ℃. Since there was no significant difference in the water leaching rate, it was fixed at 90 ℃.)

After the water leaching reaction, it was recovered, filtered, and the concentration of vanadium in the aqueous solution and the concentration of vanadium in the residue were measured using ICP-OES (Perkin Elmer, Oatima 8300), and the vanadium recovery rate was calculated using the following [Equation 1].

[Equation 1]

(C _L , _t : V concentration in the leachate at time t (mg/L), V _L : Total volume of the leachate (L), M _R : V concentration in the leach residue (mg/L), m _R : Amount of the leach residue. (g) , C _L , _f : V concentration in final leachate (mg/L))

Figure 1 is a dry roasting process diagram for vanadium recovery according to Experimental Example 1.

Referring to Figure 1, after mixing Example 1 (S100), pellets are manufactured (S120).

Afterwards, soda roasting is performed under high temperature conditions (S140), crushing is performed to reduce particle size (S160), and vanadium is recovered through a water leaching process (S180) (S200).

As a result of the analysis in the above experiment, the vanadium recovery rate was evaluated based on the concentration of vanadium in the aqueous solution and the concentration of vanadium in the residue, and is shown in [Table 1].

Looking at [Table 1] above in detail, in the case of Examples 1 to 3, the recovery rate of vanadium after roasting/leaching is the highest in Example 1 at 89.35%, and in the case of Examples 4 to 6, the recovery rate of vanadium after roasting/leaching is the highest at 89.35% in Example 1. The recovery rate of vanadium after leaching was highest at 88.51% in Example 4. This suggests that vanadium can be recovered with a high recovery rate through the above method.

Figure 2 is a graph showing the results of vanadium recovery after roasting/water leaching when sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ) according to Examples 1 to 6 were used together as composition additives.

Referring to Figure 2, it was confirmed that when sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ) were used as composition additives, there was an area where the vanadium recovery rate increased. From this, the optimal composition conditions were confirmed to be a mixed composition of 10 wt% to 20 wt% of sodium carbonate (Na ₂ CO ₃ ) and 10 wt% or less of sodium sulfate (Na ₂ SO ₄ ).

<Experimental Example 2> Sodium carbonate (Na ₂ C.O. ₃ ) Recovery rate of vanadium after roasting/leaching when added as a single composition

The reaction was performed in the same manner as Experiment 1, except that the reaction temperature was 1000°C (1273 K).

As a result of the analysis in the above experiment, the vanadium recovery rate was evaluated based on the concentration of vanadium in the aqueous solution and the concentration of vanadium in the residue, and is shown in [Table 2].

Looking at [Table 2] specifically, the recovery rate of vanadium increased from 27.9% to 64.0% as the addition of sodium carbonate (Na ₂ CO ₃ ) increased from 10 wt% to 20 wt%, but this was the case in Example 1, Considering that the vanadium recovery rate is 88.51% when 5 wt% of sodium sulfate (Na ₂ SO ₄ ) is added to 10 wt% of sodium carbonate (Na ₂ CO ₃ ), the vanadium recovery rate can be considered low. In addition, in order to increase the recovery rate of vanadium just by adding sodium carbonate (Na ₂ CO ₃ ), there is a problem of forming a viscoelastic material due to the increase in molten salt of sodium carbonate (Na ₂ CO ₃ ), resulting in a decrease in the absolute amount of sodium carbonate (Na ₂ CO ₃ ). is needed.

Therefore, in order to increase the vanadium recovery rate, a mixture of 10 wt% to 20 wt% of sodium carbonate (Na ₂ CO ₃ ) and 10 wt% or less of sodium sulfate (Na ₂ SO ₄ ) is considered to be the optimal composition condition.

Figure 3 is a graph showing the results of vanadium recovery after roasting/water leaching according to the addition of sodium carbonate (Na ₂ CO ₃ ) (wt%) according to Comparative Examples 1 to 4 when the roasting temperature is 1000°C.

Referring to FIG. 3, when only sodium carbonate (Na ₂ CO ₃ ) is used as the additive, the recovery rate of each oxide increases as the weight ratio of sodium carbonate (Na ₂ CO ₃ ) increases, and among them, vanadium oxide (V ₂ O ₅ ) was confirmed to have the highest recovery rate.

In addition, leaching of sodium (Na) was confirmed after water leaching due to the formation of water-soluble sodium vanadate (NaVO3).

<Experimental Example 3> Sodium carbonate (Na ₂ C.O. ₃ ) Recovery rate of vanadium after roasting/leaching when added as a single composition

Experimental example _{1 and} It was performed in the same way.

As a result of the analysis in the above experiment, when sodium carbonate (Na ₂ CO ₃ ) was added as a single composition according to temperature, the vanadium recovery rate was evaluated from the concentration of vanadium in the aqueous solution and the concentration of vanadium in the residue after roasting/leaching, as shown in [Table 3]. indicated.

Looking specifically at [Table 3], in Comparative Example 3, the recovery rate of vanadium slightly decreased in the temperature range of 1073 to 1173 K, but the recovery rate of vanadium increased in the temperature range of 1173 to 1273 K.

Therefore, it is judged that high-temperature roasting conditions are appropriate for the recovery rate of vanadium, and considering the generation of sulfur dioxide (SO ₂ ) from sodium sulfate (Na ₂ SO ₄ ) at the temperature of 1050 ℃ (1323 K), the temperature conditions in Experimental Example 1 were set to It was set to 1373 K.

Figure 4 is a graph showing the results of vanadium recovery after roasting/water leaching according to temperature according to Comparative Example 3.

Referring to FIG. 4, when the roasting temperature is 1173 to 1273 K, the recovery rate of vanadium oxide (V ₂ O ₅ ) increases, the recovery rate of sodium oxide (Na ₂ O) decreases, and the recovery rate of silicon oxide (SiO ₂ ) was confirmed to be a very small value.

<Experimental Example 4> Sodium sulfate (Na ₂ SO ₄ ) Recovery rate of vanadium after roasting/leaching when added as a single composition

In the same manner as in Experimental Example 1, except that the sodium sulfate (Na ₂ SO ₄ ) was added as a single composition, and the roasting temperature was adjusted to 1000 ℃ (1273 K), 1100 ℃ (1373 K), and 1200 ℃ (1473 K) carried out.

As a result of the analysis in the above experiment, when sodium sulfate (Na ₂ SO ₄ ) was added as a single composition according to temperature, the vanadium recovery rate was evaluated from the concentration of vanadium in the aqueous solution and the concentration of vanadium in the residue after roasting/leaching, as shown in [Table 4]. indicated.

Looking at [Table 4] specifically, it is generally possible to achieve a higher level of vanadium recovery at 1200 ℃ (1473K) than when mixing sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ). The roasting temperature of (1473K) is an undesirable roasting temperature because it impedes energy efficiency due to the characteristics of the rotary kiln process.

Figure 5 is a graph showing the results of vanadium recovery after roasting/water leaching according to the addition of sodium sulfate (Na ₂ SO ₄ ) (wt%) and temperature according to Comparative Examples 5 to 7.

Referring to FIG. 5, the recovery rate of vanadium increases as the roasting temperature increases, and except for the case where the roasting temperature is 1473K, the addition of sodium sulfate (Na ₂ SO ₄ ) (wt%) is 10 wt% to 15 wt%. It was confirmed that when the wt% was used, the recovery rate of vanadium was lowered.

So far, specific embodiments of the roasting additive composition for recovering vanadium from havanadium ore according to the present invention have been described, but it is obvious that various modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the claims and equivalents thereof as well as the claims described later.

That is, the above-described embodiments should be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and All changes or modified forms derived from the equivalent concept should be construed as falling within the scope of the present invention.

delete

delete

Claims (9)

A roasting additive composition for recovering vanadium from havanadium ore, comprising:
The composition of the roasting additive is a mixture of sodium carbonate (Na ₂ CO ₃ ) and sodium sulfate (Na ₂ SO ₄ ),
Based on the total composition ratio, the content of sodium carbonate is 10 to 30 wt%, and the content of sodium sulfate is 1 to 10 wt%,
The havanadium ore is vanadium-concentrated slag from which iron (Fe) was recovered by a melting reduction method,
Characterized in that the vanadium-enriched slag and the roasting additive are mixed and then roasted at a temperature of 1050 to 1200 ° C.
Roasting additive composition for vanadium recovery from havanadium ore.
delete According to clause 1,
The havanadium ore contains impurities,
The impurities include iron (Fe), sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), titanium (Ti), chromium (Cr), manganese (Mn), nickel (Ni), and cadmium ( Characterized in that it contains at least one selected from Cd), barium (Ba), silver (Ag), gallium (Ga), silicon (Si), aluminum (Al), vanadium (V), and cobalt (Co). ,
Roasting additive composition for vanadium recovery from havanadium ore.
According to clause 1,
The mixture containing the above additives is characterized in that it is manufactured into pellets of 0.1 to 30 mm,
Roasting additive composition for vanadium recovery from havanadium ore.
According to paragraph 1,
The mixture is subjected to a roasting process,
Characterized in that the roasting process time is 30 minutes to 6 hours or less,
Roasting additive composition for vanadium recovery from havanadium ore.
delete According to clause 5,
The mixture after the roasting reaction is crushed to form particles with a particle size of less than 100 μm,
Characterized in producing vanadium leachate through a water leaching process,
Roasting additive composition for vanadium recovery from havanadium ore.
In clause 7,
The water leaching process temperature is from room temperature to 95°C,
Characterized in that the water leaching time is 10 minutes or more and 4 hours or less,
Roasting additive composition for vanadium recovery from havanadium ore.
In clause 7,
Characterized in that the water leached aqueous solution is reused in the water leaching process,
Roasting additive composition for vanadium recovery from havanadium ore.