Production method of high-performance vanadium-titanium sinter

Abstract

The invention relates to the technical field of metallurgy, in particular to a production method of high-performance vanadium-titanium sintered ore, which comprises the following steps: S1, blending uniformly-mixed ore, flux, fuel and water; s2, mixing and pelletizing the prepared raw materials; s3, the mixed materials are evenly distributed on a sintering machine trolley through a distributing device, and a layer of sintered ore is laid before the mixed materials are distributed to serve as a grate-layer material; s4, the surface of the material layer on the trolley is ignited and combusted, minerals in the material layer are molten, the generated molten liquid phase is cooled and recrystallized and solidified into sintered ore, ore blending is optimized through the high-temperature performance of the raw materials, the production process is optimized, the proportion of sintered schreyerite can be greatly increased, the high-quality sintered ore is produced, and the production cost is reduced. And even if the schreyerite proportion reaches 60%, good performance of the sintered ore can still be ensured, and stable operation of a blast furnace is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a method for producing high-performance vanadium-titanium sintered ore. Background Art

[0002] Vanadium-titanium ore is currently recognized as a difficult-to-smelt iron ore resource in the world. There are only a few companies in the world that use vanadium-titanium ore as the main raw material for blast furnace smelting. The vanadium in vanadium-titanium ore has a high economic value, and the vanadium-titanium smelting efficiency is significant. Sintering with vanadium-titanium powder is conducive to reducing costs and increasing efficiency. In order to increase the output of vanadium products, it is necessary to increase the proportion of vanadium-titanium ore as much as possible.

[0003] However, since vanadium-titanium ore is different from general iron ore powder, adding vanadium-titanium powder will cause the quality of sintered ore to decline, technical and economic indicators to deteriorate, and affect the stable operation of the blast furnace. Moreover, with the increase of the proportion of vanadium-titanium ore, the quality of sintered ore declines very obviously. How to ensure that the quality of sintered ore does not decline, or even improves while increasing the proportion of vanadium-titanium ore is of great value. Summary of the invention

[0004] To solve the above problems, the present invention provides a method for producing high-performance vanadium-titanium sintered ore, which aims to solve the problem of poor quality of vanadium-titanium sintered ore, greatly increase the utilization ratio of vanadium-titanium ore, provide high-performance sintered ore for blast furnaces, create powerful conditions for the stable operation of blast furnaces, and further improve the economic benefits of vanadium-titanium smelting.

[0005] The technical solution adopted by the present invention is:

[0006] A method for producing high-performance vanadium-titanium sintered ore comprises the following steps:

[0007] S1. Batching: blending the ore, flux, fuel and water, wherein the mixed ore is formed by mixing according to the mass percentage of Longmang vanadium titanium powder 20-30%, Taihe vanadium titanium powder 10-15%, Anning vanadium titanium powder 4-6%, Chengde powder 5-10%, Pb Australia powder 14-16%, Roy Mountain 0-4%, FMG powder 0-5%, Brazilian BRBF 10-20%, high silicon Brazilian coarse 5-7%, dust removal ash and sludge 7-9% and dry grinding fine powder 1-3%;

[0008] S2. Mixing and pelletizing: mixing and pelletizing the prepared raw materials;

[0009] S3. Material distribution: The mixed material is evenly distributed on the sintering machine trolley through the distributor, and a layer of sintered ore is laid as the base material before the mixed material is distributed;

[0010] S4. Ignition and sintering: The surface of the material layer on the trolley is ignited and burned to melt the minerals in the material layer. The generated molten liquid phase is cooled and recrystallized to solidify into sintered ore.

[0011] Specifically, in step S1, dust removal ash refers to iron-containing dust collected from various processes (sintering, ironmaking, steelmaking) during the production process, and sludge refers to iron-containing dust sludge generated by processes such as steelmaking and steel rolling.

[0012] Furthermore, in step S1, the flux content is 4-5%, the fuel content is 4-6%, and the water content is 7-9%.

[0013] Furthermore, in step S1, the flux is quicklime, and the addition of quicklime is beneficial to increasing the temperature of the mixture, and because of its good dispersibility and strong activity, it is beneficial to the formation of calcium ferrite. Increasing the proportion of quicklime is beneficial to improving the sintering ore and quality.

[0014] Furthermore, in step S4, the thickness of the material layer is controlled to be between 800 and 900 mm.

[0015] Furthermore, in step S4, the air supply volume during the sintering process is 110m 3 / min. Due to the high FeO content in vanadium-titanium ore, sufficient oxygen in production is beneficial to the oxidation of FeO and the formation of calcium ferrite. The quality of sintered ore is ensured by reasonable air volume setting. In order to increase the effective sintering air volume, special attention is paid to the sealing of the sintering air system, such as sintering trolley, slide, bellows, flue, etc., to reduce air leakage.

[0016] Specifically, the current conventional sintering machine air volume is designed to be 95-100m / m2 (operating conditions). 3 / min, this application increases the sintering machine air volume to (operating condition) 110m / m2 3 / min;

[0017] In addition, the sintering ignition temperature of the present application is 1200-1250℃, the sintering negative pressure is -17.5kpa, the moisture content of the mixed material is controlled at 7.5±0.2%, the conventional material layer thickness is generally about 750mm, and the present application increases it to 800-900mm; at the same time, the sintering of the present application adopts the "thick laying and slow rotation" operation, and the sintering end temperature is controlled at 150-160℃; through the above optimization, the sintering utilization coefficient is increased from 1.30t / m 2 .h, increased to 1.45t / m 2 .h, the drum index of sintered ore increased from 73.5% to 75.5%, the low-temperature pulverization index RDI (+3.15) of sintered ore increased from 42.67% to 48.80%, and the reduction index increased from 74.72% to 77.72%.

[0018] Furthermore, in step S4, a ring cooler is used for cooling, and the flue gas from the third stage of the ring cooler is introduced onto the sintering material layer for hot air sintering. Hot air sintering can reduce the cooling rate of the upper material of the sintering trolley, avoid rapid cooling of the sintered ore, increase the temperature of the sintering material, improve the air permeability of the material, and utilize waste heat to reduce sintering fuel consumption.

[0019] Furthermore, in step S4, the temperature of the flue gas in the third stage of the ring cooler is 200-250°C.

[0020] Furthermore, in step S4, the chemical composition of the sintered ore is TFe51-55%, SiO25.1-5.3%, CaO 10-12%, MgO 1.9-2.3%, Al2O32.1-2.3%, V2O50.1-0.4%, TiO22.4-5%, and R22.1-2.3 times. The present application controls the CaO content and the SiO2 content to ensure the high basicity of the sintered ore. Due to the high TiO2 content in vanadium-titanium magnetite, CaO is easily combined with TiO2 to form perovskite (the content is as high as 13% or more, and the remaining CaO may combine with Fe2O3 to form calcium ferrite). The CaO content and the SiO2 content are controlled to ensure appropriate basicity, promote the formation of calcium ferrite, increase the strength of the sintered ore, and improve the metallurgical properties of the sintered ore.

[0021] The beneficial effects of the present invention are as follows:

[0022] The production method of high-performance vanadium-titanium sintered ore provided by the present invention uses a reasonable proportion of vanadium-titanium powder (Longmang vanadium-titanium powder, Taihe vanadium-titanium powder, Anning vanadium-titanium powder, Chengde powder) and iron ore powder (Pb Australia powder, Roy Mountain, FMG powder) to effectively solve the problems of poor assimilation of vanadium-titanium powder, less liquid phase generation, and difficulty in generating calcium ferrite during the sintering process, which affect the sintering quality. The Pb Australia powder and Brazilian BRBF are matched to solve the influence of assimilation temperature and calcium ferrite generation ability on the strength of the sintered ore. In addition, the Roy Mountain powder is added to solve the problem of poor bonding phase strength and continuous crystal strength affecting the sintering quality. Quicklime is added to control the appropriate alkalinity. The thickness of the sintering material field is adjusted, the air volume is controlled, and the introduction of hot flue gas and hot air during the sintering process is used to improve the proportion of the sintered vanadium-titanium ore, and the good performance of the sintered ore can still be guaranteed, so as to provide high-performance sintered ore for the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a production process flow chart in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively by way of examples below, and preferred embodiments of the present invention are given below. However, the present invention can be implemented in a variety of different forms and is not limited to the embodiments described herein. Any other implementation schemes obtained by modifying or equivalently replacing the technical scheme of the present invention without creative results are within the protection scope of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for describing specific embodiments and are not intended to limit the present invention.

[0026] The numerical values ​​disclosed in the embodiments of the present invention are approximate values, not definite values. When the error or experimental conditions permit, all values ​​within the error range may be included without being limited to the specific numerical values ​​disclosed in the embodiments of the present invention.

[0027] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0028] Example 1

[0029] This embodiment provides a method for producing high-performance vanadium-titanium sintered ore, comprising the following steps:

[0030] S1. Batching: Mix the ore, flux, fuel and water, wherein the flux is limestone with a content of 4, the fuel content is 5%, and the water content is 8%;

[0031] S2. Mixing and pelletizing: mixing and pelletizing the prepared raw materials;

[0032] S3. Material distribution: The mixed material is evenly distributed on the sintering machine trolley through the distributor, and a layer of sintered ore is laid as the base material before the mixed material is distributed;

[0033] S4. Ignition and sintering: The surface of the material layer on the trolley is ignited and burned to melt the minerals in the material layer. The generated molten liquid phase is cooled and recrystallized and solidified into sintered ore. Here, the material layer thickness is controlled at 800-900mm, and a ring cooler is used for cooling. The third stage flue gas (200-250℃) of the ring cooler is introduced onto the sintering material layer for hot air sintering.

[0034] Example 2

[0035] The production method of this embodiment is the same as that of embodiment 1, except that the mixed ore is different.

[0036] Example 3

[0037] The production method of this embodiment is the same as that of embodiment 1, except that the mixed ore is different.

[0038] Comparative Example

[0039] The production method of this comparative example is the same as that of Example 1, except that the mixed ore is different.

[0040] The specific composition (%) of the mixed ore in Examples 1-3 and Comparative Examples is shown in Table 1:

[0041] Table 1 Mixed ore blending table (%)

[0042] Ore Type Comparative Example Example 1 Example 2 Example 3 Longmang (low silicon) 12 20 25 30 Taihe (High Silicon) 8 10 10 15 Anning vanadium titanium powder 3 5 5 5 Chengde 5 5 10 10 Pb Australian powder 22 16 14 14 Roy Hill 5 4 / / FMG powder / 4 5 / Brazil BRBF 28 20 15 10 High silicon bar 6 6 6 6 Dust removal + sludge 8.5 8 8 8 Dry milled powder 2.5 2 2 2 Total mass 100 100 100 100

[0043] The sintered ore components (%) in Examples 1-3 and Comparative Examples are shown in Table 2:

[0044] Table 2 Sintered ore composition (%)

[0045] Component content TFe <![CDATA[SiO2]]> CaO MgO <![CDATA[Al2O3]]> <![CDATA[V2O5]]> <![CDATA[TiO2]]> R2(times) Comparative Example 54.42 5.21 10.93 1.90 2.14 0.18 2.42 2.10 Example 1 52.73 5.27 11.33 1.90 2.29 0.25 3.47 2.15 Example 2 52.67 5.17 11.11 2.10 2.30 0.30 4.05 2.15 Example 3 52.04 5.12 11.02 2.29 2.36 0.36 4.97 2.15

[0046] The sintering index test was carried out on the sintered ores produced in Examples 1-3 and the comparative example. The test results are shown in Table 3 below:

[0047] Table 3 Main sintering indicators

[0048]

[0049] The high temperature load reduction soft melting dripping performance of the sintered ore produced in Examples 1-3 and the comparative example was tested, and the test results are shown in Table 4 below:

[0050] Table 4 High temperature load reduction soft melting dripping performance of sintered ore

[0051]

[0052] The low temperature pulverization index of the sintered ore produced in Examples 1-3 and the comparative example was tested, and the test results are shown in Table 5 below:

[0053] Table 5 Low temperature pulverization index of sintered ore

[0054]

[0055] With reference to the test results of the main sintering indexes of the sintered ore in Tables 3 to 5 above, the high-temperature load reduction soft melting dripping performance of the sintered ore, and the low-temperature pulverization index of the sintered ore, it can be seen that the sintered ore production method provided in this embodiment optimizes the ore matching by optimizing the high-temperature performance of the raw materials and optimizing the production process. The proportion of sintered vanadium-titanium ore can be greatly increased to produce high-quality sintered ore. Even if the vanadium-titanium ore ratio reaches 60%, the good performance of the sintered ore can still be guaranteed, thereby ensuring the stable operation of the blast furnace.

[0056] Specifically, the production method of high-performance vanadium-titanium sintered ore provided by the present invention uses low-priced non-mainstream ores to produce high-performance sintered ore. By optimizing the ore matching according to the high-temperature performance of the raw materials and optimizing the production process, the proportion of sintered vanadium-titanium ore can be greatly improved, and high-quality sintered ore can be produced. When matching the ore, a reasonable proportion of vanadium-titanium powder (Longmang vanadium-titanium powder, Taihe vanadium-titanium powder, Anning vanadium-titanium powder, Chengde powder) and iron ore powder (Pb Australia powder, Royshan, FMG powder) are used to effectively solve the problems of poor assimilation of vanadium-titanium powder, less liquid phase generation, and difficulty in generating iron during the sintering process. The problem of calcium ferrite affecting the sintering quality is solved by combining Australian Pb powder and Brazilian BRBF to solve the influence of assimilation temperature and calcium ferrite generation capacity on the strength of sintered ore. In addition, Roy Mountain powder is added to solve the problem of poor bonding phase strength and continuous crystal strength affecting the sintering quality. Quicklime is added to control the appropriate alkalinity, and the thickness of the sintering material field is adjusted, the air volume is controlled, and the introduction of hot flue gas during the sintering process is used to increase the proportion of sintered vanadium-titanium ore, which can still ensure the good performance of the sintered ore and provide high-performance sintered ore for the blast furnace.

[0057] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for producing high-performance vanadium-titanium sintered ore, characterized in that: The steps include: S1. Batching: blending the ore, flux, fuel and water, wherein the mixed ore is formed by mixing according to the mass percentage of Longmang vanadium titanium powder 20-30%, Taihe vanadium titanium powder 10-15%, Anning vanadium titanium powder 4-6%, Chengde powder 5-10%, Pb Australia powder 14-16%, Roy Mountain 0-4%, FMG powder 0-5%, Brazilian BRBF 10-20%, high silicon Brazilian coarse 5-7%, dust removal ash and sludge 7-9% and dry grinding fine powder 1-3%; S2. Mixing and pelletizing: mixing and pelletizing the prepared raw materials; S3. Material distribution: The mixed material is evenly distributed on the sintering machine trolley through the distributor, and a layer of sintered ore is laid as the base material before the mixed material is distributed; S4. Ignition and sintering: The surface of the material layer on the trolley is ignited and burned to melt the minerals in the material layer. The generated molten liquid phase is cooled and recrystallized to solidify into sintered ore.

2. The method for producing high-performance vanadium-titanium sintered ore according to claim 1, characterized in that: In step S1, the flux content is 4-5%, the fuel content is 4-6%, and the water content is 7-9%.

3. The method for producing high-performance vanadium-titanium sintered ore according to claim 2, characterized in that: In step S1, the flux is quicklime.

4. The method for producing high-performance vanadium-titanium sintered ore according to claim 1, characterized in that: In step S4, the thickness of the material layer is controlled to be between 800 and 900 mm.

5. The method for producing high-performance vanadium-titanium sintered ore according to claim 1, characterized in that: In step S4, the air supply volume during the sintering process is 110m 3 / min, sintering ignition temperature 1200-1250℃, sintering negative pressure -17.5kpa, mixed material moisture controlled at 7.5±0.2%, material layer thickness 800~900mm, sintering end point temperature controlled at 150-160℃.

6. The method for producing high-performance vanadium-titanium sintered ore according to claim 1, characterized in that: In step S4, a ring cooler is used for cooling, and the flue gas from the third stage of the ring cooler is introduced onto the sintering material layer to perform hot air sintering.

7. The method for producing high-performance vanadium-titanium sintered ore according to claim 6, characterized in that: In step S4, the temperature of the flue gas in the third stage of the ring cooler is 200-250°C.

8. The method for producing high-performance vanadium-titanium sintered ore according to claim 1, characterized in that: In step S4, the chemical composition of the sintered ore is TFe 51-55%, SiO2 5.1-5.3%, CaO 10-12%, MgO 1.9-2.3%, Al2O3 2.1-2.3%, V2O5 0.1-0.4%, TiO2 2.4-5%, and R2 2.1-2.3 times.

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