KR101900672B1 - Smelting method of ilmenite concentrate using Red mud - Google Patents

Abstract

The present invention relates to a method of refining ilmenite using red mud, comprising: a step (a) of mixing an ilmenite concentrate with red mud to form a mixture; a step (b) of adding a carbon supply source to the mixture and heating the carbon supply source-added mixture, thereby reducing iron in the mixture to form a molten droplet; a step (c) of performing a magnetic separation process on the molten droplet to remove iron and recover a titanium dioxide slag; a step (d) of introducing the titanium dioxide slag into a Bayer process to recover alumina (Al_2O_3); and a step (e) of acid-leaching the alumina-separated titanium dioxide slag to remove silica (SiO_2). Therefore, the method of the present invention not only can separate and recover iron and titanium dioxide contained in the red mud as well as iron and titanium dioxide contained in ilmenite by mixing the red mud with the ilmenite concentrate to obtain a mixture and heating the mixture, thereby performing a reduction process of the mixture, but also can increase grade of titanium dioxide by removing alumina contained in the red mud as a process byproduct.

Description

 {Smelting method of ilmenite concentrate using Red mud}

The present invention relates to a method for smelting a luminous source of titanium, and more particularly, to a smelting method for ilmenite capable of obtaining high-quality titanium dioxide and recovering process by-products.

The titanium raw material industry, which produces titanium, is predominantly made up of iron ore deposits in Australia, South Africa, and India, or titanium oxide produced in Canada and Norway. Australia is the world's largest producer of heavy mineral concentrates and more than half of the titaniferous stones are produced as artificial rutile and used as pigments.

Titanium oxide can be used directly for the production of titanium dioxide pigments, but mostly titanium oxide improves the dignity by producing titanium dioxide slag or artificial rutile.

Another important raw material is natural rutile, which is produced as a by-product of titanium oxide in Australia, the United States and South Africa, and a major mineral in Sierra Leone.

Titanium oxide (FeO · TiO ₂ ) generally has a TiO ₂ content of 45 to 65% by weight. With the development of chemical and dry smelting technology, the iron content can be removed to improve the TiO ₂ content in artificial rutile by 90 ~ 96%.

Commercial processes for making artificial rutile from titanium oxide include the Becher process.

In the Becher process, artificial rutile is produced through a two-stage process of reduction and aeration.

In the first stage, iron oxide is coated with iron as a fuel and as a reducing agent at a high temperature of 1,300 ° C. The reaction proceeds according to Scheme 1 below.

[Reaction Scheme 1]

Fe ₂ O ₃ .TiO ₂ + 3CO- (2Fe + TiO ₂ ) + 3CO ₂

Iron is blown in air in an ammonium chloride solution at temperatures up to 80 ° C (aeration). A hydrocyclone is used to separate the artificial rutile (TiO ₂ , 90%) of the reference grade from the hydrous iron pumped to the detention pond. The general reaction is performed according to the following reaction formula 2.

[Reaction Scheme 2]

_{(2Fe + TiO 2) + O} 2 → 2FeO + TiO 2

In this case, it is impossible to physically separate the reduced iron when reducing at 1300 ° C in the process of using iron. Therefore, after the iron oxide is oxidized again in the subsequent process, the aeration process, the iron is separated by acid leaching and recovered, thereby improving the quality of the titanium dioxide.

According to the conventional Becher process, the reduced iron produced in the reduction process can not be separated in advance, and the purity of titanium dioxide is increased through an aeration and acid leaching process thereafter, thereby greatly increasing the load of the aeration and acid leaching processes.

On the other hand, red mud is a wastewater generated during the bauxite refining process, which has a water content of 40 ~ 55% and a pH of 11 ~ 13.

In addition, there is a large amount of hydrated aluminum silicate and quartz, but the method of using the hydrated aluminum silicate and quartz has not been disclosed, and it is very difficult to treat because of its strong oxidizing ability and development of new utilization method is urgent.

As a prior art related to this, there is a method for producing metallic titanium by using a luminous ornithine ore as disclosed in Korean Patent Laid-open Publication No. 10-2017-0021759 (Laid-open date: 2017.02.28).

Korean Patent Publication No. 2017-0021759 (published Feb. 28, 2017) Korean Patent No. 1736625 (issued on December 21, 2017)

Accordingly, the present invention relates to a smelting method of ilmenite utilizing red mud, and it is possible to recover high purity titanium dioxide by smelting a sun-mine by using red mud as a flux or raw material, , And provides a method of smelting the sun metal using the red mud which is difficult to treat as waste.

The efficiency of the process can be greatly increased by increasing the quality of titanium dioxide recovered in the smelting process and at the same time the alumina (Al ₂ O ₃ ) contained in the red mud added as a flux can be separated to newly provide a method of utilizing the red mud .

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be understood by those skilled in the art from the following description.

In order to solve the above-mentioned problems, the present invention provides a method for preparing a mixture comprising: (a) mixing an ilmenite concentrate and a red mud to form a mixture; (b) adding a carbon source to the mixture and heating to reduce the iron in the mixture to form a molten droplet; (c) selecting iron from the molten droplet to remove iron and recovering the titanium dioxide slag; (d) introducing the titanium dioxide slag into a Bayer process to recover alumina (Al ₂ O ₃ ); And (e) acid-leaching the titanium dioxide slag from which alumina has been separated to remove silica (SiO ₂ ).

In addition, the ilmenite concentrate may contain 17 to 50% by weight of titanium dioxide (TiO ₂ ).

The red mud can also include titanium dioxide (TiO ₂ ), alumina (Al ₂ O ₃ ), and silica (SiO ₂ ).

The titanium dioxide (TiO ₂ ) may be contained in an amount of 5 to 10% by weight.

In addition, 10 to 200 parts by weight of red mud may be added to 100 parts by weight of the total sumuminate concentrate.

In the step of mixing the ilmenite concentrate and red mud to form a mixture, the mixture may be pressurized to form a monochromatic light.

The carbon source may be any one selected from bituminous coal consisting of peat, lignite and bituminous coal.

The carbon source may be added in an amount of 10 to 100 parts by weight based on 100 parts by weight of the mixture.

The carbon source may be added to the mixture and the iron in the mixture may be reduced by heating at 1400 to 1700 占 폚 for 15 minutes to 10 hours.

The heating may be performed in a sintering furnace or a rotary furnace.

The iron is reduced and formed into a droplet shape and can be physically separated through magnetic force sorting.

The molten droplets may be included in the reduced material in an amount of 25 to 30% by weight.

The Bayer process may add caustic soda (NaOH) to the titanium dioxide slag and leach alumina at a pressure of 15-20 bar at 150-200 [deg.] C.

The Bayer process can leach alumina by adding caustic soda (NaOH) from 1.25 to 6.25 M to the titanium dioxide slag.

The acid leaching can be carried out using 0.05 to 30% sulfuric acid for 5 minutes to 10 hours to remove iron together with residual silica in the titanium dioxide slag.

The recovered titanium dioxide slag may be in the range of 70% to 97%.

According to the present invention, the red mud generated in the aluminum oxide smelting process, which is very difficult to treat, can be treated together with the smelting process of the ylmenite as a flux or raw material.

In addition, when red Ni and Ilmenite concentrates are mixed and heated to reduce them, it is possible to collect and recover both iron and titanium dioxide as well as iron and titanium dioxide contained in ilmenite, .

Further, it is possible to greatly increase the quality of the remaining titanium dioxide slag by physically selecting and separating it by forming a molten droplet by reducing it together with red stones instead of reducing and removing iron, which is an impurity contained in the ilmenite, at a high temperature .

In addition, the aeration step for recovering high-quality titanium dioxide by minimizing the content of iron in the recovered titanium dioxide slag by recovering and recovering reduced iron through a reduction process for controlling the heating temperature by adding a carbon source, So that the cost of the smelting process of the ylmenite can be drastically reduced.

Also, in the process of smelting titanium dioxide with the use of a luminophore of ilmenite, high-quality titanium dioxide can be recovered by utilizing red mud, which is a very difficult waste, and byproducts can be obtained as scrap iron, It is very environmentally friendly.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a process flow diagram of a smithing method using red mats in accordance with an embodiment of the present invention.
FIG. 2 is a photograph of a sample of ilmenite, red mud, and bituminous coal as a starting material in the smectic smelting method using red mud, according to an embodiment of the present invention.
FIG. 3 is a photograph of a reduced iron heated by melting in a smelting method using red mats according to an embodiment of the present invention.
FIG. 4 is a schematic view showing a configuration of a smithering smelting method using red mud in accordance with an embodiment of the present invention.
5 is a photograph of a high-temperature high-pressure leaching apparatus.
FIG. 6 is a graph showing alumina and silica contents according to caustic soda concentration in a Bayer process step in a smelting method using ilmenite according to an embodiment of the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a process flow diagram of a smithing method using red mats in accordance with an embodiment of the present invention.

Referring to FIG. 1, a method for smelting smelting irinite according to the present invention includes the steps of (a) mixing an ilmenite concentrate and a red mud to form a mixture; (b) adding a carbon source to the mixture and heating to reduce the iron in the mixture to form a molten droplet; (c) selecting iron from the molten droplet to remove iron and recovering the titanium dioxide slag; (d) introducing the titanium dioxide slag into a Bayer process to recover alumina (Al ₂ O ₃ ); And (e) leaching the alumina is an acid titanium dioxide slag separation (acid-leaching), and a step) to remove silica (SiO _2).

First, an ilmenite concentrate and red mud are mixed to form a mixture (S100).

The ilmenite concentrate may be one obtained by benefiting from an ornamentation with an ornamenium ores.

The ilmenite concentrate may contain 17 to 50 wt% of titanium dioxide (TiO ₂ ).

The quality of the ylmenite concentrate is generally 45% to 50%, but the higher the quality of titanium, the higher the process cost.

In addition, since the quality of domestically produced indium is generally in the range of 17% to 50%, it is very difficult to use titanium dioxide for smelting. However, high-quality titanium dioxide can be obtained by mixing low-

The ilmenite concentrate may contain 35 to 65% of titanium dioxide and the remaining iron oxide (FeO _x ).

The acid iron is separated and recovered in the magnetic force sorting step.

The red mud may be waste generated in the aluminum oxide smelting process.

The red mud includes titanium dioxide (TiO ₂ ), alumina (Al ₂ O ₃ ), and silica (SiO ₂ ).

The pH of the red mud is very high, so it is difficult to dispose of the red mud, but when it is mixed with the luminol concentrate, iron and titanium dioxide contained in red mud can be separated and recovered.

The red mud may contain 5 to 10% by weight of titanium dioxide (TiO ₂ ).

The titanium dioxide contained in the red mud can be recovered together with the titanium dioxide contained in the ylmnate concentrate.

The red mud includes alumina and silica.

The alumina and silica may be contained in the titanium dioxide slag produced by reduction, and in this case, the step of removing the alumina and silica is required because it reduces the quality of the titanium dioxide. In this case, a high-quality titanium dioxide can be obtained .

The red mud may contain, in addition to titanium dioxide, 30 to 40% by weight of residual hematite (Fe ₂ O ₃ ).

The red mud hematite may be reduced together with the iron component of the ilmenite concentrate to form a molten droplet and be physically separated through magnetic force selection.

Red mullite may be added in an amount of 10 to 200 parts by weight based on 100 parts by weight of the total sumuminate concentrate.

The red iron oxide contained in the red mite has a very fast reduction rate as compared with the ilmenite, so it is changed into reduced iron first.

The resulting reduced iron is carburized by carbon, has a low melting point and acts as a strong reducing agent itself, which facilitates the reduction of the ylmenite and increases the production of molten drops which are reduced iron.

10 to 200 parts by weight of red mud are added to 100 parts by weight of the total sumuminate concentrate.

When the amount of the red mud is less than 10 parts by weight, the quality of the recovered titanium dioxide does not reach 97%. When the amount of the red mud is more than 200 parts by weight, the efficiency of the heating and iron reduction process becomes very low .

In the step of mixing the ilmenite concentrate and red mud to form a mixture, the mixture may be pressurized to form a pellet.

In the case of forming the mixture by single light, the efficiency of the step of heating and reducing afterward can be greatly increased, and the convenience of the operation in the reduction process using the rotary furnace or the sintering furnace can be greatly increased.

The carbon source is added to the mixture and heated to reduce iron in the mixture to form a molten droplet (S200).

The carbon source may be any coal selected from bituminous coal consisting of peat, lignite and bituminous coal.

The carbon source has high volatility.

The carbon source can increase the reaction temperature in the step of heating and reducing the mixture, and the carbon reduced reduced iron itself becomes a very strong reducing agent, greatly increasing the efficiency of the reduction step and increasing the production of molten droplets .

The carbon source may be added in an amount of 10 to 100 parts by weight based on 100 parts by weight of the mixture.

When the carbon source is set to the maximum, the maximum reduction rate can be expected, and unreacted residual carbon can be recovered and reused.

When the amount of the carbon source is less than 10 parts by weight, it is difficult to increase the temperature required for the reduction reaction. When the amount of the carbon source exceeds 100 parts by weight, an extra carbon source is added to increase the process cost, have.

The carbon source may be added to the mixture and the iron in the mixture may be reduced and roasted by heating at 1400 to 1700 占 폚 for 15 minutes to 10 hours.

When the mixture is heated to less than 1400 ° C, the mixture of irinite concentrate and red mud does not reach the melting temperature and does not melt. The composition of alumina and silica can be controlled in the slag generated when heating is performed in the above range, The iron component can be physically separated.

The heating may be performed in a sintering furnace or a rotary furnace.

In the case of using a sinter bed or a rotary kiln, a carbon source can be added to easily raise the temperature to a set temperature, and the reaction temperature and the reaction time can be controlled while the reduction reaction proceeds It is very advantageous.

The iron may be reduced and formed into a molten droplet form.

When the irinite concentrate and red mud are mixed and heated, the iron oxide component in the ylmnate concentrate and the iron of the hematite contained in the red mud are reduced and discharged into the oxide, which is then discharged in the form of a molten droplet.

The irinite concentrate and red mud can be used to separate iron components in a single process, and the reduced iron can be easily recycled by physical selection.

The magnetic drops are sorted by magnetic force to remove iron, and the titanium dioxide slag is recovered (S300).

When the reduced iron is formed in the form of a molten droplet, the iron component aggregates and can easily be attracted to the magnetism. The magnetite concentrate and the iron component in the red mud can be separated together in one step by magnetic force sorting.

The titanium dioxide slag is separated from iron and removed, and the content of titanium dioxide derived from the ylmenite concentrate and red mud is increased, so that the quality of the titanium dioxide can be greatly increased.

The recovery of alumina (Al ₂ O ₃₎ by introducing the titanium dioxide slag in the Bayer process (Bayer process) (S400).

The Bayer process refers to a process in which caustic soda is added at high temperature and high pressure and leached to discharge alumina into the crystal.

The titanium dioxide slag may contain alumina and silica derived from red mud.

If the alumina and silica are not removed, the quality of the recovered titanium dioxide can be lowered.

The Bayer process may add caustic soda (NaOH) to the titanium dioxide slag and leach alumina at a pressure of 15-20 bar at 150-200 [deg.] C.

Alkali leaching by caustic soda is performed in the high-temperature and high-pressure range to recover alumina. When the temperature and pressure range are not satisfied, the leaching efficiency of alumina is reduced.

The Bayer process can leach alumina by adding caustic soda (NaOH) from 1.25 to 6.25 M to the titanium dioxide slag.

The alumina can be dissolved and precipitated in the above concentration range, and the silica contained in the titanium dioxide slag can be dissolved together and leached.

When the caustic soda is less than 1.25 M, alumina is hardly contained in less than 3% by weight in the recovered titanium dioxide slag.

It is possible to recover high-quality titanium dioxide by controlling the content of alumina and silica in the titanium dioxide slag calculated by adjusting the concentration of the caustic soda.

Thereafter, the titanium dioxide slag from which alumina is separated is acid-leached to remove silica (SiO ₂ ) (S500).

The acid leaching can be carried out using 0.05 to 30% sulfuric acid for 5 minutes to 10 hours to remove the residual silica in the titanium dioxide slag.

The concentration of sulfuric acid depends on the nature of the residue and is inversely proportional to the leaching time.

In the acid leaching step, all of the iron components in the residue can be removed, and the silica remaining in the titanium dioxide slag can be removed at the same time.

Through the acid leaching, the gangue component and the impurities can be completely removed from the titanium dioxide slag, and the residual iron and silica can be removed, and the quality of the titanium dioxide slag as a final product can be greatly increased.

The recovered titanium dioxide slag may be in the range of 70% to 97%.

The titanium dioxide slag is used as a high-quality titanium dioxide raw material such as a pigment.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

Example 1 Smelting of Ilmenite Using Red Mud

FIG. 4 is a schematic view showing a configuration of a smithering smelting method using red mud in accordance with an embodiment of the present invention.

Referring to FIG. 4, a mixture prepared by mixing 100 g of a lumineter and 100 g of red mignon was pressurized to prepare a single-phase light.

The powder was mixed uniformly with a ball mill through the ball mill, and the mixture was blended using a pelletizer with a maximum pressure of 5 tons.

Bituminous coal was added to the single light and reduced by heating in a rotary furnace at 1700 캜 for 15 minutes.

It was confirmed that high temperature melting occurred and the resulting molten droplets and residues were confirmed.

The molten droplet was separated using a magnetic separator.

The molten droplets were removed to recover the titanium dioxide slag.

5 is a photograph of a high-temperature high-pressure leaching apparatus.

Referring to FIG. 5, caustic soda was charged into the high-temperature high-pressure leaching apparatus together with the titanium dioxide slag from which the molten droplets were removed, and leached at 200 ° C. and 20 bar for 1 hour.

The components leached after leaching were analyzed to determine the content of alumina and silica in the titanium dioxide slag.

The titanium dioxide slag from which alumina was removed was acid leached by adding sulfuric acid at a concentration of 30%.

Finally, the quality of the recovered titanium dioxide slag was confirmed.

Experimental Example 1 Removal of Iron by Reduction

FIG. 2 is a photograph of a sample of ilmenite, red mud, and bituminous coal as a starting material in the smectic smelting method using red mud, according to an embodiment of the present invention.

FIG. 3 is a photograph of a reduced iron heated by melting in a smelting method using red mats according to an embodiment of the present invention.

Furtherance
sample SiO ₂ Al ₂ O ₃ FeO _x CaO MgO Na ₂ O TiO ₂ MnO Ilmenite 1.06 1.10 12.8 (Fe ₂ O ₃ )
31.6 (FeO) 0.59 0.35 - 49.5 1.0 Redness 10.0 23.1 37.4 (Fe ₂ O ₃ ) 6.0 0.3 5.3 7.9 0.1

Table 1 shows the result of analyzing the starting material yluminate concentrate and the red mud component according to the embodiment of the present invention by an energy dispersive X-ray fluorescence spectrometer.

Referring to Table 1, it was confirmed that the irinite concentrate and the red mud contained the titanium dioxide component and the iron component necessary for separation and recovery.

Furtherance
sample SiO ₂ Al ₂ O ₃ FeO _x CaO MgO Na ₂ O TiO ₂ MnO Titanium dioxide slag after reduction 7.01 1.81 1.97 (Fe ₂ O ₃ )
8.84 (FeO) 0.59 0.35 - 81.8 1.0 Molten oxide 11.5 2.14 14.4 5.5 0.5 5.0 45.2 1.5

Table 2 shows the composition of the slag after the melting and reduction step by heating.

As shown in Table 2, it was confirmed that the amount of iron oxide (FeO _x ) of the slag after reduction was very small as compared with that of red niobium nitrate added to 10% of all the components.

In addition, the amount of iron in the slag was greatly decreased after the reduction by magnetic force lines, and the content of titanium dioxide was greatly increased.

When titanium dioxide production process is performed by mixing ilmenite and red mud and adding bituminous coal and heating it in a rotary kiln to adjust the reaction temperature, the iron reacted with the bituminous coal becomes a strong reducing agent again, and most of the iron component is reduced to be a molten drop.

Therefore, since the smelting method using ilmenite according to the present invention utilizes the red mud which is a waste that is difficult to treat, it is possible to obtain high-quality titanium dioxide by smelting the low-grade aluminum halide in an environmentally friendly manner.

<Experimental Example 2> Alumina and silica leaching by Bayer process

It was confirmed that impurities were able to remove alumina and silica by leaching at high temperature and high pressure by adding caustic soda to titanium dioxide slag by reducing and extracting molten bubbles by magnetic force.

The red mud contains alumina and silica in addition to iron oxide, and remains after the reduction and after magnetic force separation to increase the load of the acid leaching process and reduce the quality of the recovered titanium dioxide.

FIG. 6 is a graph showing alumina and silica contents according to caustic soda concentration in a Bayer process step in a smelting method using ilmenite according to an embodiment of the present invention.

Referring to FIG. 6, it was confirmed that not only alumina remaining in the titanium dioxide slag but also silica was removed when the concentration of caustic soda was 2.5 M or more when leached at 200 ° C. and 20 bar for 1 hour.

In particular, when the concentration of caustic soda is 2.5 M or more, the content of alumina and silica can be effectively controlled to 3 wt% or less.

Accordingly, the smelting method using ilmenite according to the present invention can obtain various byproducts by utilizing the red mud, which is difficult to treat, and can be recycled. Environmentally friendly.

When titanium dioxide production process is performed by mixing ilmenite and red mud and adding bituminous coal and heating it in a rotary kiln to adjust the reaction temperature, the iron reacted with the bituminous coal becomes a strong reducing agent again, and most of the iron component is reduced to be a molten drop.

At this time, if the iron component is reduced by separating the molten droplet by magnetic force, titanium oxide of high quality can be recovered separately from the iron component while greatly reducing the load of the acid treatment process.

When the alumina and silica contained in the red mud are concentrated in the reduced titanium dioxide slag, it is introduced into the Bayer process and leached at high temperature and high pressure to remove silica as well as impurities alumina. The alumina discharged into the crystal is recovered And can be reused.

Although the specific embodiments of the method for smelting titanium dioxide using ilmenite according to the present invention have been described, it is apparent that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be construed as limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the claims.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

Claims (16)

(a) mixing an ilmenite concentrate and a red mud to form a mixture;
(b) adding a carbon source to the mixture and heating to reduce the iron in the mixture to form a molten droplet;
(c) selecting iron from the molten droplet to remove iron and recovering the titanium dioxide slag;
(d) introducing the titanium dioxide slag into a Bayer process to recover alumina (Al ₂ O ₃ ); And
(e) acid-leaching the alumina-separated titanium dioxide slag to remove silica (SiO2)
Characterized in that caustic soda having a concentration of 2.5 to 6.25 M is added to the titanium dioxide slag and the alumina is leached at a temperature of 150 to 200 DEG C and a pressure of 15 to 20 bar, Smelting method.
The method according to claim 1,
The Ilmenite concentrate
, And titanium dioxide (TiO ₂ ) in an amount of 17 to 50% by weight.
The method according to claim 1,
The reddish
A method for smelting smithery using red mud, characterized by comprising titanium dioxide (TiO ₂ ), alumina (Al ₂ O ₃ ) and silica (SiO ₂ ).
The method of claim 3,
Wherein the titanium dioxide is contained in an amount of 5 to 10% by weight.
The method according to claim 1,
Wherein red mink is added in an amount of 10 to 200 parts by weight based on 100 parts by weight of the total sumuminate concentrate.
The method according to claim 1,
In the step of mixing the ilmenite concentrate and red mud to form a mixture,
And the mixture is pressurized to form monochromatic light.
The method according to claim 1,
The carbon source
And the bituminous coal is made of bituminous coal, peat, lignite and bituminous coal.
The method according to claim 1,
The carbon source
Wherein the mixture is added in an amount of 10 to 100 parts by weight based on 100 parts by weight of the total amount of the mixture.
The method according to claim 1,
The carbon source is added to the mixture,
And heating the mixture at 1400 to 1700 占 폚 for 15 minutes to 10 hours to reduce iron in the mixture.
The method according to claim 1,
The heating
Sintering furnace or a rotary furnace.
The method according to claim 1,
The iron
And is formed into a droplet form and is physically separated through magnetic force sorting.
The method according to claim 1,
Wherein the molten droplet comprises 25 to 30 wt% of the reduced material.
delete delete The method according to claim 1,
The acid leaching
0.05 to 30% sulfuric acid is used for leaching for 5 minutes to 10 hours to remove iron together with the residual silica in the titanium dioxide slag.
The method according to claim 1,
Wherein the recovered titanium dioxide slag has a durability of 70% to 97%.

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