CN111286630B - Method for removing impurities and purifying titanium concentrate through suspension roasting - Google Patents
Method for removing impurities and purifying titanium concentrate through suspension roasting Download PDFInfo
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- CN111286630B CN111286630B CN202010126865.8A CN202010126865A CN111286630B CN 111286630 B CN111286630 B CN 111286630B CN 202010126865 A CN202010126865 A CN 202010126865A CN 111286630 B CN111286630 B CN 111286630B
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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
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
- C22B34/1204—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A method for purifying titanium concentrate by suspension roasting comprises the following steps: (1) finely grinding the titanium concentrate; (2) carrying out first-stage magnetic separation on the titanium concentrate powder to obtain first-stage magnetic separation concentrate and first-stage magnetic separation tailings; (3) the first-stage magnetic separation tailings are dehydrated through filter pressing, filter pressing residues are conveyed to a drying suspension roasting furnace, and high-temperature flue gas is introduced for suspension drying; (4) conveying the dried material to a weak oxidation suspension roasting furnace, heating to 600-800 ℃ in a heating section, entering an oxidation section, performing weak oxidation reaction under the action of air, and performing heat exchange and cooling on the weak oxidation material to form a cooled material; (5) carrying out second-stage magnetic separation on the cooled material to obtain second-stage magnetic separation concentrate and second-stage magnetic separation tailings; and the first-stage magnetic separation concentrate and the second-stage magnetic separation concentrate are used as purified titanium concentrate products. The method has the advantages of simple process flow, large equipment treatment capacity, easily controllable product properties, energy conservation and environmental protection in industrial application and easy realization of large-scale production.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for purifying titanium concentrate by suspension roasting.
Background
In China, titanium resources mainly come from vanadium-titanium magnetite in Panxi area of Sichuan and Chengde and other places of Hebei, and vanadium-containing concentrate and titanium-containing concentrate are respectively obtained after a complex mineral separation process, wherein the titanium-containing concentrate can be used for preparing titanium dioxide. The titanium dioxide is mostly prepared by an electric furnace smelting-titanium slag upgrading process, the high-quality titanium dioxide prepared by the process requires low impurity content in the titanium concentrate, and the currently domestic titanium concentrate is mostly not up to the standard; therefore, the method realizes the deep quality improvement and impurity removal of the common titanium concentrate, and has important significance for relieving the situation of insufficient supply of high-quality titanium concentrate in China.
Patent CN 201610348552.0 relates to a method for obtaining ultrafine-grained titanium concentrate, which takes titanium iron ore as raw material, and sequentially carries out flat-ring magnetic separation, desliming flotation, titanium floatation roughing and titanium floatation concentration to finally obtain TiO2Ultrafine-grained titanium concentrate with grade of 47-48.5%The patent adopts the traditional mineral processing technology to realize certain enrichment of the titanium concentrate, but the titanium concentrate is TiO2The grade is less than 49 percent, the method is not enough for producing high-quality titanium concentrate, the recovery rate is low, a large amount of reagents are adopted, and the cost is high.
Patent CN 201710599152.1 relates to a process for mining and separating titanium concentrate and iron concentrate from sand ilmenite, wherein the process improves the recovery rate and the concentrate quality through fractional concentration and fractional reselection; the recovery rate of iron is increased by more than 20%, the recovery rate of titanium is increased by more than 25%, and the grades of titanium concentrate and iron concentrate are respectively improved by more than 2%. The process has improved titanium grade and recovery compared with the prior process, but the titanium concentrate TiO obtained in the embodiment of the invention2The grades are all lower than 48 percent, and the requirement of high-quality titanium concentrate can not be met.
Disclosure of Invention
The invention aims to provide a method for purifying titanium concentrate by suspension roasting and impurity removal.
The method of the invention is carried out according to the following steps:
1. grinding the titanium concentrate until the part with the particle size of less than or equal to 0.074mm accounts for more than 60 percent of the total mass, and preparing titanium concentrate powder; the titanium concentrate contains TiO according to mass percentage2 35～49％，Fe 15～45％，Mg+Al+Si+Ca 8～20％；
2. Carrying out first-stage magnetic separation on the titanium concentrate powder, wherein the magnetic field intensity of the first-stage magnetic separation is 1000-2000 Oe, and obtaining first-stage magnetic separation concentrate and first-stage magnetic separation tailings;
3. filter-pressing and dehydrating the first-stage magnetic separation tailings to prepare filter-pressing residues with water mass percent of less than or equal to 10%, then conveying the filter-pressing residues to a drying suspension roasting furnace, introducing high-temperature flue gas with the temperature of 100-150 ℃ into the drying suspension roasting furnace, and drying the filter-pressing residues in a suspension state under the action of the high-temperature flue gas to form a dry material which is discharged from the drying suspension roasting furnace;
4. conveying the dried material into a weak oxidation suspension roasting furnace, wherein the suspension roasting furnace is formed by connecting a heating section and an oxidation section in series; respectively introducing fuel gas and air into the heating section and the oxidation section; heating the dried material to 600-800 ℃ by using fuel gas in the heating section, allowing the heated dried material to enter an oxidation section, keeping the heated dried material in a suspension state under the action of air, and performing weak oxidation reaction, wherein iron titanate in the dried material is subjected to weak oxidation to generate a magnetic ilmenite-hematite solid solution, and all materials react to generate a weak oxidation material; conveying the weakly oxidized material to a heat exchanger to be cooled to a temperature less than or equal to 90 ℃, and conveying the formed cooled material to a storage bin; wherein the time of the weak oxidation reaction is 20-50 min;
5. carrying out second-stage magnetic separation on the cooled material, wherein the magnetic field intensity of the second-stage magnetic separation is 1000-2000 Oe, and obtaining second-stage magnetic separation concentrate and second-stage magnetic separation tailings; and taking the first-stage magnetic separation concentrate and the second-stage magnetic separation concentrate as purified titanium concentrate products.
In the step 1, the titanium concentrate is ground until the part with the grain diameter less than or equal to 0.038mm accounts for more than 90 percent of the total mass, and the titanium concentrate powder is prepared.
In the step 3, the retention time of the filter pressing residues in the suspension roasting furnace is 20-30 min; the mass content of water in the dried material is less than or equal to 1 percent.
In the step 4, the weak oxidation reaction generates high-temperature flue gas, and the high-temperature flue gas is introduced into the drying suspension roasting furnace at the temperature of 100-150 ℃.
In the step 4, when the weakly oxidized material is generated by the reaction, the mass percentage of the ilmenite-hematite solid solution is<When the content of the nitrogen is 60%, conveying the weak oxidation material to a reduction suspension roasting furnace, and introducing nitrogen and reducing gas into the reduction suspension roasting furnace, wherein the volume ratio of the nitrogen to the reducing gas is 1-5; the weak oxidation materials enter a reduction suspension roasting furnace from the upper part, and nitrogen and reducing gas enter the reduction roasting furnace from the bottom; the weakly oxidized material is in a suspension state under the action of airflow, and is subjected to a re-reduction reaction at the temperature of 500-700 ℃ to generate a reduced material, wherein the content of ilmenite-hematite solid solution in the total mass of the reduced material is more than or equal to 80%; conveying the reduced material to a heat exchanger to reduce the temperature to be less than or equal to 90 ℃, and conveying the formed cooled material to a storage bin; the reducing gas is CO and H2Or coal gas.
The purified titanium concentrate product contains TiO according to mass percentage2≥50％，Mg+Al+Si+Ca≤8％。
In the step 4, the reaction formula of the weak oxidation reaction is as follows:
FeTiO3+0.25O2→0.5Fe2O3+TiO2and
xFeTiO3+(1-x)Fe2O3→xFeTiO3g(1-x)Fe2O3。
the reaction formula of the above-mentioned re-reduction reaction is:
Fe2O3+CO/H2→Fe3O4+CO2/H2O。
in the method, when the mass content of the magnetite in the iron ore concentrate is less than 5 percent, the first-stage magnetic separation can be omitted; separating iron minerals with strong magnetic lines after the titanium concentrate powder is subjected to first-stage magnetic separation; drying the high-temperature flue gas generated by the weak oxidation reaction, or drying the metallographic phase of the high-temperature flue gas by matching with a heating device; the dried material is formed into a magnetic material through weak oxidizing roasting, and when the magnetism cannot meet the requirement, the magnetism is enhanced through reduction; cooling the magnetic material, and then carrying out magnetic separation to ensure that titanium as a magnetic component enters magnetic concentrate; the purified titanium concentrate product can meet the requirement of producing high-quality titanium dioxide.
Compared with the conventional magnetic separation or flotation process, the method can realize the high-efficiency removal of impurities such as magnesium, aluminum, calcium, silicon and the like in the low-grade titanium concentrate, and provides a high-quality titanium concentrate raw material for producing a titanium-rich material by a chlorination method; the method has the advantages that the variety and the physicochemical property of useful minerals in the titanium concentrate are different, the magnetic separation and the suspension roasting are selected to be combined to realize the step-by-step recycling, and the operation productivity and the operation efficiency are realized to the greatest extent; the method has the advantages of simple process flow, large equipment treatment capacity, easily controllable product properties, energy conservation and environmental protection in industrial application and easy realization of large-scale production.
Drawings
FIG. 1 is a schematic flow chart of a method for purifying titanium concentrate by suspension roasting and impurity removal in example 4 of the present invention;
FIG. 2 is a schematic diagram of a dry suspension calcination process in an embodiment of the present invention;
FIG. 3 is a schematic view of a flow chart of a weak oxidation reaction in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a re-reduction reaction scheme in an example of the present invention.
Detailed Description
The equipment adopted for carrying out filter pressing in the embodiment of the invention is a plate and frame filter press or a diaphragm type filter press.
In the embodiment of the invention, a ball mill is adopted for grinding.
The heat exchanger in the embodiment of the invention exchanges heat, and materials are discharged into the cyclone cooling and cold air vertical pipe combined device through the sealing vertical pipe to be cooled.
In the embodiment of the invention, TiO in the second-stage magnetic separation tailings2When the mass percentage of the second-stage magnetic separation tailings is less than or equal to 50 percent, carrying out flotation purification on the second-stage magnetic separation tailings to obtain TiO2The flotation concentrate with the mass percentage content of more than or equal to 50 percent, the first-stage magnetic separation concentrate (containing titanium magnetite) and the second-stage magnetic separation concentrate (strong magnetic titanium mineral) are used as purified titanium concentrate products (high-quality titanium concentrate).
In the embodiment of the invention, a wet low intensity magnetic separator is adopted for the first-stage magnetic separation and the second-stage magnetic separation, and during the magnetic separation, the material to be magnetically separated is prepared into ore pulp with the mass concentration of 25-35% and then is magnetically separated.
The recovery rate of titanium in the embodiment of the invention is more than or equal to 84 percent.
In the embodiment of the invention, when the re-reduction treatment is carried out, the nitrogen flow is 3-5 m for every 50kg of weakly-oxidized materials3H, 2-4 m of reducing gas3/h。
In the embodiment of the invention, a drying heat generator is adopted for auxiliary heating during drying.
Example 1
Grinding the titanium concentrate until the part with the particle size of less than or equal to 0.074mm accounts for 80 percent of the total mass, and preparing titanium concentrate powder; the titanium concentrate contains TiO according to the mass percentage2 48.54％，Fe 26.23％，MgO 4.31％，Al2O3 1.67％，CaO 0.93％，SiO24.62％；
Carrying out first-stage magnetic separation on the titanium concentrate powder, wherein the magnetic field intensity of the first-stage magnetic separation is 1000Oe, and a first-stage magnetic separation concentrate and a first-stage magnetic separation tailing are obtained;
filter-pressing and dehydrating the first-stage magnetic separation tailings to prepare filter-pressing residues with water mass percent of less than or equal to 10%, then conveying the filter-pressing residues to a drying suspension roasting furnace, introducing high-temperature flue gas with the temperature of 100-150 ℃ into the drying suspension roasting furnace, and drying the filter-pressing residues in a suspension state under the action of the high-temperature flue gas to form a dry material (dry product) which is discharged from the drying suspension roasting furnace; the retention time of the filter pressing residues in the suspension roasting furnace is 20 min; the mass content of water in the dried material is less than or equal to 1 percent;
conveying the dried material into a weak oxidation suspension roasting furnace, wherein the suspension roasting furnace is formed by connecting a heating section and an oxidation section in series; respectively introducing fuel gas and air into the heating section and the oxidation section; the gas in the heating section heats the dry material to 600 ℃, the heated dry material enters the oxidation section, is in a suspension state under the action of air and is subjected to weak oxidation reaction, at the moment, the iron titanate in the dry material is subjected to weak oxidation to generate a magnetic ilmenite-hematite solid solution, and all the materials react to generate a weak oxidation material (oxidation product); conveying the weakly oxidized material to a heat exchanger to be cooled to a temperature less than or equal to 90 ℃, and conveying the formed cooled material to a storage bin; wherein the time of the weak oxidation reaction is 50 min; the weak oxidation reaction generates high-temperature flue gas, and the high-temperature flue gas is introduced into the drying suspension roasting furnace at the temperature of 100-150 DEG C
Carrying out second-stage magnetic separation on the cooled material, wherein the magnetic field intensity of the second-stage magnetic separation is 1000Oe, and obtaining second-stage magnetic separation concentrate and second-stage magnetic separation tailings; using the first-stage magnetic separation concentrate and the second-stage magnetic separation concentrate as purified titanium concentrate products, and containing TiO according to mass percentage255.36％，MgO 1.91％，Al2O3 0.43％，CaO 0.20％，SiO21.1 percent; the titanium recovery rate is 84.10%.
Example 2
The method is the same as example 1, except that:
(1) the titanium concentrate contains TiO according to the mass percentage2 41.21％，Fe 25.32％，MgO 4.66％，Al2O32.52％，CaO 1.54％，SiO25.54 percent; will be provided withGrinding the titanium concentrate until the part with the grain diameter less than or equal to 0.074mm accounts for 75 percent of the total mass;
(2) the magnetic field intensity of the first stage of magnetic separation is 1500 Oe;
(3) the retention time of the filter pressing residues in the suspension roasting furnace is 25 min;
(4) heating to 700 deg.C for weak oxidation reaction for 30 min;
(5) the magnetic field intensity of the second-stage magnetic separation is 1500 Oe; the purified titanium concentrate product contains TiO according to the mass percentage253.24％，TFe 27.53％，MgO 2.21％，Al2O3 1.02％，CaO 0.94％，SiO22.32 percent; the recovery rate of titanium is 85.73%.
Example 3
The method is the same as example 1, except that:
(1) the titanium concentrate contains TiO according to the mass percentage246.72 percent and Fe 38.57 percent; grinding the titanium concentrate until the part with the particle size less than or equal to 0.038mm accounts for 90 percent of the total mass;
(2) the magnetic field intensity of the first stage of magnetic separation is 2000 Oe;
(3) the retention time of the filter pressing residues in the suspension roasting furnace is 25 min;
(4) heating to 800 deg.C for weak oxidation reaction for 20 min; (ii) a
(5) Magnetic field intensity of two-stage magnetic separation is 2000 Oe; the purified titanium concentrate product contains TiO according to the mass percentage253.24％，TFe 27.53％，MgO 2.21％，Al2O3 1.02％，CaO 0.94％，SiO22.32 percent; the recovery rate of titanium is 85.73%.
Example 4
The flow is shown in figure 1;
the method is the same as example 1, except that:
(1) the titanium concentrate contains TiO according to the mass percentage239.22 percent and Fe 40.16 percent; grinding the titanium concentrate until the part with the particle size less than or equal to 0.038mm accounts for 95 percent of the total mass;
(2) the magnetic field intensity of the first stage of magnetic separation is 2000 Oe;
(3) the retention time of the filter pressing residue in the suspension roaster (dryer) is 30 min; the flow is shown in FIG. 2;
(4) heating to 650 ℃ for weak oxidation reaction for 20 min; the mass percentage of ilmenite-hematite solid solution in the weakly oxidized material is less than 60%; conveying the weakly oxidized materials into a reduction suspension roasting furnace (a re-reduction roasting furnace), and simultaneously introducing nitrogen and reducing gas into the reduction suspension roasting furnace, wherein the volume ratio of the nitrogen to the reducing gas is 3; the weak oxidation materials enter a reduction suspension roasting furnace from the upper part, and nitrogen and reducing gas enter the reduction roasting furnace from the bottom; the weakly oxidized material is in a suspension state under the action of airflow, and is subjected to re-reduction reaction at the temperature of 600 ℃ to generate a reduced material (reduced product), wherein the ilmenite-hematite solid solution accounts for 82% of the total mass of the reduced material; conveying the reduced material to a heat exchanger to reduce the temperature to be less than or equal to 90 ℃, and conveying the formed cooled material to a storage bin; the reducing gas is coal gas; the flow is shown in fig. 3 and 4;
(5) magnetic field intensity of two-stage magnetic separation is 2000 Oe; TiO in two-stage magnetic separation tailings2The mass percentage content of (A) is 48%; performing flotation purification on the two-stage magnetic separation tailings to obtain TiO2The flotation concentrate with the mass percentage of 52 percent is used as a purified titanium concentrate product together with the first-stage magnetic separation concentrate and the second-stage magnetic separation concentrate, and the purified titanium concentrate product contains TiO according to the mass percentage2 53.24％，TFe 27.53％，MgO 2.21％，Al2O3 1.02％，CaO 0.94％，SiO22.32 percent; the recovery rate of titanium is 85.73%.
Claims (2)
1. A method for purifying titanium concentrate by suspension roasting and impurity removal is characterized by comprising the following steps:
(1) grinding the titanium concentrate until the part with the particle size of less than or equal to 0.074mm accounts for 80 percent of the total mass, and preparing titanium concentrate powder; the titanium concentrate contains TiO according to mass percentage2 48.54%，Fe 26.23%，MgO 4.31%，Al2O3 1.67%，CaO 0.93%，SiO24.62%；
(2) Carrying out first-stage magnetic separation on the titanium concentrate powder, wherein the magnetic field intensity of the first-stage magnetic separation is 1000Oe, and a first-stage magnetic separation concentrate and a first-stage magnetic separation tailing are obtained;
(3) filter-pressing and dehydrating the first-stage magnetic separation tailings to prepare filter-pressing residues with water mass percent of less than or equal to 10%, then conveying the filter-pressing residues to a drying suspension roasting furnace, introducing high-temperature flue gas with the temperature of 100-150 ℃ into the drying suspension roasting furnace, and drying the filter-pressing residues in a suspension state under the action of the high-temperature flue gas to form a dry material which is discharged from the drying suspension roasting furnace; the retention time of the filter pressing residues in the suspension roasting furnace is 20 min; the mass content of water in the dried material is less than or equal to 1 percent;
(4) conveying the dried material into a weak oxidation suspension roasting furnace, wherein the suspension roasting furnace is formed by connecting a heating section and an oxidation section in series; respectively introducing fuel gas and air into the heating section and the oxidation section; the gas in the heating section heats the dry material to 600 ℃, the heated dry material enters the oxidation section, is in a suspension state under the action of air and is subjected to weak oxidation reaction, at the moment, the iron titanate in the dry material is subjected to weak oxidation to generate a magnetic ilmenite-hematite solid solution, and all the materials react to generate a weak oxidation material; conveying the weakly oxidized material to a heat exchanger to be cooled to a temperature less than or equal to 90 ℃, and conveying the formed cooled material to a storage bin; wherein the time of the weak oxidation reaction is 50 min; the weak oxidation reaction generates high-temperature flue gas, and the high-temperature flue gas is introduced into the drying suspension roasting furnace at the temperature of 100-150 ℃;
(5) carrying out second-stage magnetic separation on the cooled material, wherein the magnetic field intensity of the second-stage magnetic separation is 1000Oe, and obtaining second-stage magnetic separation concentrate and second-stage magnetic separation tailings; taking the first-stage magnetic separation concentrate and the second-stage magnetic separation concentrate as purified titanium concentrate products; the purified titanium concentrate product contains TiO according to the mass percentage2 55.36%，MgO 1.91%，Al2O3 0.43%，CaO 0.20%，SiO21.1 percent; the titanium recovery rate is 84.10%.
2. A method for purifying titanium concentrate by suspension roasting and impurity removal is characterized by comprising the following steps:
(1) grinding the titanium concentrate until the part with the particle size of less than or equal to 0.074mm accounts for 75 percent of the total mass to prepare titanium concentrate powder; the titanium concentrate contains TiO according to mass percentage2 41.21%，Fe 25.32% ，MgO 4.66%，Al2O3 2.52%，CaO 1.54%，SiO25.54%；
(2) Carrying out first-stage magnetic separation on the titanium concentrate powder, wherein the magnetic field intensity of the first-stage magnetic separation is 1500Oe, and obtaining first-stage magnetic separation concentrate and first-stage magnetic separation tailings;
(3) filter-pressing and dehydrating the first-stage magnetic separation tailings to prepare filter-pressing residues with water mass percent of less than or equal to 10%, then conveying the filter-pressing residues to a drying suspension roasting furnace, introducing high-temperature flue gas with the temperature of 100-150 ℃ into the drying suspension roasting furnace, and drying the filter-pressing residues in a suspension state under the action of the high-temperature flue gas to form a dry material which is discharged from the drying suspension roasting furnace; the retention time of the filter pressing residues in the suspension roasting furnace is 25 min; the mass content of water in the dried material is less than or equal to 1 percent;
(4) conveying the dried material into a weak oxidation suspension roasting furnace, wherein the suspension roasting furnace is formed by connecting a heating section and an oxidation section in series; respectively introducing fuel gas and air into the heating section and the oxidation section; the gas in the heating section heats the dry material to 700 ℃, the heated dry material enters the oxidation section, is in a suspension state under the action of air and is subjected to weak oxidation reaction, at the moment, the iron titanate in the dry material is subjected to weak oxidation to generate a magnetic ilmenite-hematite solid solution, and all the materials react to generate a weak oxidation material; conveying the weakly oxidized material to a heat exchanger to be cooled to a temperature less than or equal to 90 ℃, and conveying the formed cooled material to a storage bin; wherein the time of the weak oxidation reaction is 30 min; the weak oxidation reaction generates high-temperature flue gas, and the high-temperature flue gas is introduced into the drying suspension roasting furnace at the temperature of 100-150 ℃;
(5) carrying out second-stage magnetic separation on the cooled material, wherein the magnetic field intensity of the second-stage magnetic separation is 1500Oe, and obtaining second-stage magnetic separation concentrate and second-stage magnetic separation tailings; taking the first-stage magnetic separation concentrate and the second-stage magnetic separation concentrate as purified titanium concentrate products; the purified titanium concentrate product contains TiO according to the mass percentage2 53.24%，TFe 27.53%，MgO 2.21%，Al2O3 1.02%，CaO 0.94%，SiO22.32 percent; the recovery rate of titanium is 85.73%.
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| CN112941305B (en) * | 2021-01-28 | 2022-09-27 | 东北大学 | Device and method for recovering titanium from fine-particle ilmenite through fluidized reduction roasting-magnetic separation |
| CN112941306B (en) * | 2021-01-28 | 2022-06-03 | 东北大学 | Selective roasting-magnetic separation device and method for micro-fine-particle ilmenite |
| CN114160304A (en) * | 2021-12-02 | 2022-03-11 | 华筑绿建(北京)科技有限公司 | Raw ore iron removal process |
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| CN108212509A (en) * | 2018-01-16 | 2018-06-29 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of hematite-limonite of titaniferous vanadium |
| CN108246496A (en) * | 2018-01-16 | 2018-07-06 | 东北大学 | A kind of ilmenite ores separation beneficiation method of titano-hematite |
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