Method for producing vanadium-containing iron ore concentrate suitable for metallized pellet-electric furnace melt separation

Abstract

The invention provides a method for producing vanadium-containing iron ore concentrate suitable for metallized pellet-electric furnace melt separation, which comprises the following steps of: pre-classifying the existing two-stage vanadium-titanium-iron ore concentrate to separate out fine-fraction high-TFe-grade products and coarse-fraction products with lower TFe-grade, and respectively sorting the coarse-fraction products and the fine-fraction products; the vanadium-titanium-iron concentrate suitable for metallized pellet-electric furnace melting separation short-process ironmaking is obtained; and the content of TFe in the reselection product is increased, and slagging elements such as SiO2, CaO, MgO, Al2O3, K2O and Na2O are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive utilization of vanadium-titanium magnetite, and relates to a method for producing vanadium-containing iron concentrate suitable for metallized pellet-electric furnace melting separation. BACKGROUND

[0002] The existing vanadium-titanium magnetite iron concentrate and ordinary magnetite improve the TFe grade generally by adopting the process of grinding-classification-coarse particle level returning grinding-fine particle level weak magnetic separation, and the hematite and limonite improve the TFe grade of concentrate generally by adopting the process of grinding-classification-strong magnetic separation + flotation. The iron concentrate produced from the vanadium-titanium magnetite generally has a TFe grade of 54% to 59%, a TiO2 grade of 8% to 13%, a V2O5 grade of 0.55% to 0.75%, a SiO2 content of 2.5% to 6.0%, a CaO content of 1.0% to 2.0%, a MgO content of 3.0% to 4.5%, and an Al2O3 content of 3.0% to 4.5%, and is all used for agglomeration (sintering or pelletizing)-ordinary blast furnace ironmaking-iron melt converter vanadium extraction-electric furnace steelmaking. Due to the limitation that the TiO2 in the slag cannot exceed 23% when the ordinary blast furnace utilizes the vanadium-titanium iron concentrate for ironmaking, the comprehensive utilization of titanium resources in the slag and the improvement of the vanadium yield of the blast furnace ironmaking are difficult, and when the iron concentrate produced from the Panxi vanadium-titanium magnetite is directly used for the metallized pellet-electric furnace melting separation short process ironmaking, the TiO2 grade in the slag is difficult to exceed 50%, so that the short process ironmaking process utilizing the vanadium-titanium iron concentrate is difficult to be economically realized. SUMMARY

[0003] In view of this, the purpose of the present application is to provide a method for producing vanadium-containing iron concentrate suitable for metallized pellet-electric furnace melting separation, which can improve the quality of vanadium-titanium magnetite iron concentrate and realize short process ironmaking and vanadium extraction with comprehensive utilization of titanium resources.

[0004] The present application provides a method for producing vanadium-containing iron concentrate suitable for metallized pellet-electric furnace melting separation, comprising the following steps:

[0005] (1) The vanadium-titanium iron concentrate slurry after demagnetization is fed into (2) operation;

[0006] (2) The vanadium-titanium iron concentrate slurry after demagnetization is subjected to hydrocyclone classification, and the sand product is fed into (4) operation, and the overflow of the cyclone is fed into (3) operation by gravity flow;

[0007] (3) The cyclone in (2) is classified by screening, the screened product is combined with the sand of the cyclone in (2) and fed into (4) operation, and the screened product is fed into (6) operation;

[0008] (4) The sand of the cyclone in (2) and the screened product of (3) are fed into a stirring device by gravity flow after adjusting the slurry concentration by adding water, and then fed into (5) operation by gravity flow;

[0009] (5) the tailings of roughing and cleaning of (5) and (9) and the undersize product of (7) are thickened, the underflow of thickening is pumped into (11) operation, and the overflow of thickening is pumped into (4) and (8) operations as circulating water;

[0010] (6) the underflow of (3) is subjected to hydrocyclone, the sand of the cyclone is subjected to (8) operation, and the overflow of the cyclone is subjected to (7) operation;

[0011] (7) the cyclone of (6) is subjected to screening classification, the oversize product is combined with the sand of (6) and subjected to (8) operation, and the undersize product is subjected to (10) operation;

[0012] (8) the sand of (6) and the oversize product of (7) are subjected to self-flow into a stirring device and are added with water to adjust the concentration of the slurry and then are subjected to self-flow into (9) operation;

[0013] (9) the tailings of roughing and cleaning of (8) are subjected to shaking table separation, and vanadium-titanium-iron concentrate 2, roughing tailings and cleaning tailings are obtained.

[0014] Preferably, the application further comprises:

[0015] (10) the tailings of roughing and cleaning of (5) and (9) and the undersize product of (7) are thickened, the underflow of thickening is pumped into (11) operation, and the overflow of thickening is pumped into (4) and (8) operations as circulating water;

[0016] (11) the underflow of thickening is subjected to grinding, and the tailings of grinding are pumped into (12) operation;

[0017] (12) the sand of cyclone classification is subjected to self-flow back to (11) operation, and the overflow of the cyclone is subjected to (13) operation;

[0018] (13) the overflow of (13) operation is subjected to drum magnetic separator to recover vanadium-titanium-iron concentrate, and vanadium-titanium-iron concentrate 3 and tailings 3 are obtained.

[0019] In the application, the tailings of roughing and cleaning of (5) are pumped into (10) operation;

[0020] The tailings of roughing and cleaning of (9) are pumped into (10) operation.

[0021] In the application, a high-frequency vibrating screen with a screen hole of 0.074mm-0.15mm is used for screening in (3).

[0022] In the application, a high-frequency vibrating screen with a screen hole of 0.038mm-0.074mm is used for screening in (7).

[0023] In the application, the tailings of (4) are used for shaking table separation in (5).

[0024] In the application, demagnetization is performed in (1) to eliminate obvious magnetic agglomeration;

[0025] The ore concentration in the drum magnetic separator in step (13) is 10% to 25%, and the magnetic field strength is 1500 Oe to 4500 Oe.

[0026] In the present application, the TFe of the vanadium-titanium iron concentrate 1 in step (2) is 60.03%, the TiO2 is 11.48%, the V2O5 is 0.691%, the S is 0.61%, the CaO is 0.08%, the MgO is 1.43%, the SiO2 is 0.23%, and the Al2O3 is 1.85%;

[0027] The TFe of the vanadium-titanium iron concentrate 2 is 60.49%, the TiO2 is 10.94%, the S is 0.52%, the CaO is 0.06%, the MgO is 1.38%, the SiO2 is 0.19%, and the Al2O3 is 1.76%.

[0028] The present application describes the chemical properties and mineral properties of the vanadium-titanium iron concentrate slurry from two dimensions of chemical composition and mineral composition. In the present application, the vanadium-titanium iron concentrate slurry in step (1) includes TFe 56.00%, FeO 32.89%, TiO2 9.89%, V2O5 0.691%, S 0.47%, Co 0.017%, Cu 0.029%, Ni 0.021%, Pb<0.01%, Zn 0.04%, P<0.005%, As<0.01%, Mn 0.304%, CaO 0.53%, MgO 3.18%, K2O 0.018%, Na2O 0.078%, SiO2 4.01%, and Al2O3 3.60%;

[0029] The solids in the vanadium-titanium iron concentrate slurry include titanium magnetite 82.76%, pyrrhotite 2.29%, ilmenite 3.29%, spessartine 0.12%, chlorite 3.89%, magnesium aluminum spinel 0.76%, middle labradorite 0.61%, actinolite 0.85%, hornblende 1.17%, calcite 0.01%, olivine 3.58%, sodium feldspar 0.02%, titanite 0.09%, augite 0.09%, pyrite 0.06%, chalcopyrite 0.02%, mica 0.14%, and the rest of the minerals 0.25%.

[0030] In the present application, the vanadium-titanium iron concentrate 1 and the vanadium-titanium iron concentrate 2 are mixed for metallized pellet-electric furnace smelting iron;

[0031] The vanadium-titanium iron concentrate 3 is used for ordinary blast furnace ironmaking.

[0032] Currently, the iron-bearing minerals in vanadium-titanium magnetite iron ore are unevenly distributed, and the vanadium-bearing iron concentrate particles obtained from grinding and beneficiation are also unevenly distributed. The TFe grade, gangue mineral types and contents, and the degree of liberation of gangue minerals in each particle size of the vanadium-bearing iron concentrate product vary greatly. Elements such as Si, Ca, K, and Na mainly exist in the form of pyroxene, chlorite, amphibole, olivine, and feldspar, while Mg and Al mainly exist in the form of magnesium aluminum spinel, pyroxene, amphibole, and chlorite. This invention utilizes this principle, employing a process of existing two-stage vanadium-titanium iron concentrate – high-frequency pulse demagnetizer – hydrocyclone + high-frequency screen pre-classification – coarse-grained product shaking table gravity separation – gravity separation tailings and fine-grained product grinding and classification – weak magnetic separation. This process can significantly reduce the amount of ore entering subsequent grinding operations, achieve coarse and fine separation, narrow-grained separation, reduce material and energy consumption, improve the particle size of upgraded iron concentrate, and reduce the filtration moisture and slag-forming element content of upgraded vanadium-titanium iron concentrate, thereby achieving the goal of reducing production costs and providing a foundation for the application of short-process ironmaking technology to vanadium-titanium magnetite.

[0033] This invention provides a method for producing vanadium-titanium iron concentrate suitable for metallized pelletizing-electric furnace smelting. This method pre-classifies existing two-stage vanadium-titanium iron concentrate to separate fine-grained high-TFe-grade products and coarse-grained products with lower TFe grades. The coarse and fine-grained products are then separately sorted to obtain vanadium-titanium iron concentrate suitable for short-process ironmaking using metallized pelletizing-electric furnace smelting and vanadium-titanium iron concentrate suitable for conventional blast furnace ironmaking. The method provided by this invention is applicable not only to increasing the TFe grade of vanadium-titanium magnetite iron concentrate in the Panxi region but also to increasing the TFe grade in iron concentrate from ordinary magnetite. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the process for producing suitable metallized pellets and electric furnace smelting of vanadium-containing iron concentrate according to an embodiment of the present invention. Detailed Implementation

[0035] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, of a method for producing suitable metallized pellets-electric furnace smelting of vanadium-containing iron concentrate provided by the present invention, should not be construed as limiting the scope of protection of the present invention.

[0036] Example 1

[0037] The main physicochemical properties of the ore described in this example are:

[0038] The vanadium-titanium iron concentrate sample contains 56.00% TFe, 32.89% FeO, 9.89% TiO2, 0.691% V2O5, 0.47% S, 0.017% Co, 0.029% Cu, 0.021% Ni, <0.01% Pb, 0.04% Zn, <0.005% P, <0.01% As, 0.304% Mn, 0.53% CaO, 3.18% MgO, 0.018% K2O, 0.078% Na2O, 4.01% SiO2, and 3.60% Al2O3. The sample contained 73.92% minerals at -0.074 mm. The composition of the sample included 82.76% titanomagnetite, 2.29% pyrrhotite, 3.29% ilmenite, 0.12% andradite, 3.89% chlorite, 0.76% aluminum spinel, 0.61% labradorite, 0.85% actinolite, 1.17% amphibole, 0.01% calcite, 3.58% olivine, 0.02% albite, 0.09% sphene, 0.09% titanopyroxene, 0.06% pyrite, 0.02% chalcopyrite, 0.14% mica, and 0.25% other minerals.

[0039] See Figure 1 The following process will be performed:

[0040] (1) Demagnetization: Add the dry iron concentrate to the hopper of a 10cm×10cm swing feeder, adjust the valve of the swing feeder to feed 60kg / h, add water to adjust the concentration to 40%, and feed it into the GMT-60 high frequency pulse demagnetizer with a vertical sand pump for demagnetization. Demagnetize until there is no magnetic agglomeration. The demagnetized slurry is fed into the pump with a booster pump. (2) Operation:

[0041] (2) Hydrocyclone Classification 1: A φ25 type hydrocyclone is used to classify the demagnetized slurry of (1). The hydrocyclone is used for sand feeding operation (3), and the hydrocyclone overflow is fed into operation (3).

[0042] (3) High-frequency vibrating screen classification 1: KM-800-4S ultrasonic high-frequency vibrating screen is used to classify the overflow of the hydrocyclone in (2). The screen hole size is 0.074mm. The product on the screen and the sediment in the hydrocyclone of (2) are combined and enter the (4) operation, and the product under the screen enters the (6) operation.

[0043] (4) Adjust the slurry concentration 1: (2) The sediment from the hydrocyclone and (3) the screen product flow into the XDT-15L type mixing tank by gravity and add water to adjust the slurry concentration before feeding into (5) operation by gravity;

[0044] (5) Vanadium-titanium iron concentrate 1: The discharge of (4) is separated by a 2100×1050 type Yunnan tin ore mud shaking table. The process is a roughing and a cleaning process. The parameters such as the shaking table slope is adjusted to 2°~5°, the stroke is 15mm~25mm, and the transverse flushing water flow rate is 150-300mL / s to obtain vanadium-titanium iron concentrate 1, roughing tailings and cleaning tailings. The roughing tailings and cleaning tailings are pumped to (10) operation.

[0045] (6) Hydrocyclone Classification 2: The undersize product of the (3) medium and high frequency vibrating screen is fed into the φ20 type hydrocyclone using a booster pump. The sediment in the hydrocyclone enters the (8) operation, and the overflow of the hydrocyclone enters the (7) operation.

[0046] (7) High-frequency vibrating screen classification 2: (6) The hydrocyclone is screened and classified by the KM-800-4S ultrasonic high-frequency vibrating screen with a screen hole of 0.038mm. The product on the screen and the sediment in the hydrocyclone of (6) are combined and enter (8) operation, and the product under the screen enters (10) operation.

[0047] (8) Adjust the slurry concentration 2: (6) The sediment from the hydrocyclone and (7) the screen product flow into the XDT-15L type mixing tank by gravity and add water to adjust the slurry concentration before feeding into (9) operation by gravity;

[0048] (9) Fine particle shaking table separation of vanadium-titanium iron concentrate 2: The discharge of (8) is separated by a 2100×1050 type Yunnan Tin fine particle shaking table. The process is a roughing and a cleaning process. The parameters such as the shaking table slope of 1°~3°, stroke of 8mm~15mm, and the horizontal flushing water flow rate of 100~200mL / s are adjusted to obtain vanadium-titanium iron concentrate 2, roughing tailings and cleaning tailings. The roughing tailings and cleaning tailings are pumped to (10) operation.

[0049] (10) Thickener concentration: The rough and fine tailings of (5) and (9) and the high frequency screen product of (7) are concentrated by a φ2000mm type central drive rake thickener. The concentrated underflow is pumped into (11) operation, and the concentrated overflow is pumped into (4) and (8) operation respectively.

[0050] (11) Grinding: The concentrated underflow from (10) operation is ground using an LJM-50L vertical spiral stirred mill, and the ore discharge is fed into (12) operation by a pump;

[0051] (12) Hydrocyclone Classification 3: A φ15 hydrocyclone is used to classify the ore discharged from (11). The sediment from the hydrocyclone classification flows back to the (11) operation by gravity, and the overflow from the hydrocyclone enters the (13) operation.

[0052] (13) Weak magnetic separation with a magnetic field strength of 1500 Oe~4500 Oe is used to recover vanadium-titanium iron concentrate: (12) The overflow of the hydrocyclone is recovered by a drum magnetic separator to obtain vanadium-titanium iron concentrate 3 and tailings 3.

[0053] (14) Vanadium-titanium iron concentrate 1 and vanadium-titanium iron concentrate 2 are combined as high-quality vanadium-titanium iron concentrate with low slag-forming elements, vanadium-titanium iron concentrate 3 is processed as ordinary vanadium-titanium iron concentrate, and magnetic separation tailings are used as final tailings.

[0054] Table 1 shows the process test results of the examples;

[0055] Table 2 shows the analysis results of the main chemical components of the feed ore, high-quality vanadium-titanium iron concentrate (vanadium-titanium iron concentrate 1 and vanadium-titanium iron concentrate 2), and ordinary vanadium-titanium iron concentrate, excluding the main elements.

[0056] Table 1. Results of process tests in the examples

[0057]

[0058] Table 2 Comparison of chemical composition analysis results of main slag-forming components in feed and products from the examples

[0059]

[0060] As can be seen from the above embodiments, the present invention utilizes common demagnetizers, hydrocyclones, high-frequency vibrating screens, vertical stirred mills, shaking tables, and weak magnetic separators to process vanadium-titanium iron concentrate through a process of demagnetization-hydrocyclone + high-frequency screen classification-coarse product shaking table gravity separation-shaking table tailings and fine product grinding and classification weak magnetic separation. This process increases the TFe content in the gravity separation product and reduces slagging elements such as SiO2, CaO, MgO, Al2O3, K2O, and Na2O, resulting in vanadium-titanium iron concentrate suitable for short-process ironmaking such as metallization pelletizing and electric furnace smelting. It can also obtain vanadium-titanium iron concentrate suitable for ordinary blast furnace ironmaking. This method is of great significance for short-process ironmaking and the comprehensive utilization of titanium resources in vanadium-titanium iron concentrate.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for producing vanadium-bearing iron concentrate suitable for metallized pelletizing-electric furnace smelting, comprising the following steps: (1) The vanadium-titanium iron concentrate slurry is demagnetized and then enters (2) operation; (2) The demagnetized vanadium-titanium iron concentrate slurry is classified by hydrocyclone, and the sand product enters (4) operation, while the overflow of the hydrocyclone flows into (3) operation. (3) The hydrocyclones in (2) are screened and graded. The oversize product and the undersize product from (2) are combined and enter (4) operation, while the undersize product enters (6) operation. (4) The sediment from the hydrocyclone in (2) and the product on the screen in (3) flow into the mixing device by gravity and water is added to adjust the slurry concentration before it flows into (5) for operation; (5) The ore discharge from (4) is separated by shaking table to obtain vanadium-titanium iron concentrate 1, rough tailings and clean tailings; (6) The product screened in (3) is hydrocycloned, the sediment from the hydrocyclone enters (8) operation, and the overflow from the hydrocyclone enters (7) operation; (7) and (6) are screened and graded. The oversize product and the undersize product of (6) are combined and enter (8) operation, and the undersize product enters (10) operation. (8) The sediment from the hydrocyclone in (6) and the product on the screen in (7) flow into the mixing device by gravity and water is added to adjust the slurry concentration before it flows into (9) for operation; (9) The ore discharge from the shaking table separation (8) is used to obtain vanadium-titanium iron concentrate 2, rough tailings and fine tailings.

2. The method according to claim 1, characterized in that, Also includes: (10) The tailings from the shaking table roughing process of (5) and (9), the tailings from the cleaning process, and the undersize product of (7) are concentrated. The concentrated underflow is fed into (11) operation, and the concentrated overflow is pumped into (4) and (8) operation respectively. (11) Grind the concentrated underflow, and pump the ore discharge into (12) the operation; (12) The hydrocyclone classifies the sediment and returns it to (11) operation by gravity, and the hydrocyclone overflow enters (13) operation; (13) The overflow of the hydrocyclone in the operation is recovered by a drum magnetic separator to obtain vanadium-titanium iron concentrate 3 and tailings 3.

3. The method according to claim 2, characterized in that, The roughing tailings and cleaning tailings obtained in step (5) are pumped to operation (10); The roughing tailings and fine tailings obtained in step (9) are pumped to operation (10).

4. The method according to claim 1, characterized in that, In step (3), a high-frequency vibrating screen with a sieve aperture of 0.074 mm to 0.15 mm is used for screening.

5. The method according to claim 1, characterized in that, In step (7), a high-frequency vibrating screen with a sieve aperture of 0.038mm~0.074mm is used for screening.

6. The method according to claim 1, characterized in that, In step (5), the ore discharge is achieved by using a shaking table to separate the tin ore mud (4).

7. The method according to claim 2, characterized in that, The phenomenon of demagnetization to non-magnetic agglomeration in step (1); Step (13) The ore concentration in the drum magnetic separator is 10%~25%, and the magnetic field strength is 1500Oe~4500Oe.

8. The method according to claim 2, characterized in that, In step (2), the vanadium-titanium iron concentrate 1 contains 60.03% TFe, 11.48% TiO2, 0.691% V2O5, 0.61% S, 0.08% CaO, 1.43% MgO, 0.23% SiO2, and 1.85% Al2O3. The vanadium-titanium iron concentrate 2 contains 60.49% TFe, 10.94% TiO2, 0.52% S, 0.06% CaO, 1.38% MgO, 0.19% SiO2, and 1.76% Al2O3.

9. The method according to claim 2, characterized in that, The vanadium-titanium iron concentrate slurry in step (1) contains 56.00% TFe, 32.89% FeO, 9.89% TiO2, 0.691% V2O5, 0.47% S, 0.017% Co, 0.029% Cu, 0.021% Ni, <0.01% Pb, 0.04% Zn, <0.005% P, <0.01% As, 0.304% Mn, 0.53% CaO, 3.18% MgO, 0.018% K2O, 0.078% Na2O, 4.01% SiO2, and 3.60% Al2O3. The solids in the vanadium-titanium iron concentrate slurry include 82.76% titanomagnetite, 2.29% pyrrhotite, 3.29% ilmenite, 0.12% andradite, 3.89% chlorite, 0.76% aluminum spinel, 0.61% labradorite, 0.85% actinolite, 1.17% amphibole, 0.01% calcite, 3.58% olivine, 0.02% albite, 0.09% sphene, 0.09% titanopyroxene, 0.06% pyrite, 0.02% chalcopyrite, 0.14% mica, and the remaining minerals account for 0.25%.

10. The method according to claim 2, characterized in that, The vanadium-titanium iron concentrate 1 and vanadium-titanium iron concentrate 2 are mixed and used for metallized pelletizing-electric furnace smelting and ironmaking; The vanadium-titanium iron concentrate 3 is used for ironmaking in a conventional blast furnace.

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