Vanadium extraction slag conditioning agent and preparation method thereof

Abstract

This invention discloses a vanadium-extracting slag conditioner and its preparation method, relating to the field of blast furnace ironmaking. It solves the problems of existing vanadium-extracting slag conditioners, such as high cost, inconvenience in furnace loading, high MFe content in the slag, and high residual vanadium in semi-steel. The slag conditioner is composed of the following weight percentages: 4-6% Al₂O₃, 15-22% SiO₂, 70-75% FeO, and 1.5-3% MgO. A method for preparing the vanadium-extracting slag conditioner is also provided: raw materials are weighed according to a certain ratio, mixed for a first processing time to obtain a first raw material; the first raw material is then introduced into a granulation device for a second processing time to obtain the finished granular slag conditioner. By adjusting the appropriate proportions of the slag conditioner, adding suitable amounts of Al₂O₃ and SiO₂, increasing the proportion of FeO in the slag conditioner, and adjusting the ratio of MgO to Al₂O₃, setting the mass ratio of Al₂O₃ to MgO to 1.2-4, the MFe content and residual vanadium in the slag are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking, and in particular to a vanadium-raising slag conditioner and its preparation method. Background Technology

[0002] Vanadium extraction in converters requires high stability of vanadium-titanium molten iron quality. When the quality of molten iron fluctuates, slag conditioners need to be added during the vanadium extraction process to control the slag state, ensure that the vanadium slag has good fluidity, promote slag-iron separation, reduce the amount of iron carried in the slag, reduce the residual V in semi-steel, improve the vanadium recovery rate, and ensure vanadium efficiency.

[0003] Existing vanadium slag conditioning agents have drawbacks such as high cost, inconvenience in furnace loading, high MFe content in slag, and high residual V in semi-steel. Summary of the Invention

[0004] This invention aims to solve the problems of high cost, inconvenience in furnace feeding, high MFe content in slag, and high residual vanadium in semi-steel by adjusting the appropriate ratio of slag conditioner, setting the mass ratio of Al2O3 to MgO to 1.2-4, so that the slag forming effect of the slag conditioner is good, and the MFe content and residual vanadium in the slag are effectively reduced.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] A vanadium-extraction slag conditioner, wherein the slag conditioner is composed of the following weight percentages: 4-6% Al2O3, 15-22% SiO2, 70-75% FeO, and 1.5-3% MgO, wherein the mass ratio of Al2O3 to MgO is 1.2-4.

[0007] By adjusting the appropriate proportions of the slag conditioner, adding suitable amounts of Al2O3 and SiO2, increasing the proportion of FeO in the slag conditioner, and adjusting the ratio of MgO to Al2O3, setting the mass ratio of Al2O3 to MgO to 1.2–4, the slag conditioner achieves good slag-forming effect and fast slag-forming speed, effectively reducing the MFe content and residual vanadium in the slag. Simultaneously, the raw materials are all simple and low-cost components, reducing the cost of the slag conditioner, facilitating furnace feeding, achieving fast slag-forming speed, good slag-forming effect, and broadening its application scope.

[0008] Optionally, the slag conditioner consists of the following weight percentages: 5% Al2O3, 20% SiO2, 72% FeO, and 3% MgO.

[0009] Optionally, the particle size of the Al2O3 is 100-150 mesh.

[0010] Optionally, the particle size of the SiO2 is 80-105 mesh.

[0011] Optionally, the FeO particle size is 70-85 mesh.

[0012] Optionally, the melting point of the slag conditioner is less than 1200°C.

[0013] This invention also provides a method for preparing a vanadium-extracting slag conditioner, comprising the following steps:

[0014] S1. Weigh the raw materials according to the proportion, mix them for the first processing time, and obtain the first raw material;

[0015] S2. The first raw material is introduced into the granulation device for molding and granulation for a second processing time to obtain the finished granular slag conditioner.

[0016] Optionally, the first processing time is 1 to 3 hours.

[0017] Optionally, the second processing time is 3 to 4 hours.

[0018] Optionally, the diameter of the finished granular slag conditioner is 10–13 mm.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] 1. This invention relates to a vanadium-reducing slag conditioner. By adjusting the appropriate proportions of the slag conditioner, adding suitable amounts of Al2O3 and SiO2, increasing the proportion of FeO in the slag conditioner, and adjusting the ratio of MgO to Al2O3, setting the mass ratio of Al2O3 to MgO to 1.2-4, the slag conditioner achieves good slag-forming effect and fast slag-forming speed, effectively reducing the MFe content and residual vanadium in the slag. Simultaneously, the raw materials are simple and low-cost components, solving the problems of high cost, inconvenience in furnace feeding, high MFe content in the slag, and high residual vanadium (V) in semi-steel.

[0021] Specifically, by controlling the mass ratio of Al2O3 to MgO, the content of MgO is increased. MgO is a basic oxide; when the MgO content in the slag increases, free oxygen ions are added to the system. These free oxygen ions interact with bridging oxygen, causing the Si-OO bonds to break, and AlO4... - and SiO4 - The bonds between the slag particles are broken, which makes the slag structure more complex, thereby increasing the heat storage capacity of the slag system, lowering the melting point of the vanadium slag conditioner, ensuring good fluidity of the vanadium slag, ensuring the slag-iron separation capacity of the vanadium slag system, and reducing the amount of metallic iron in the vanadium slag.

[0022] 2. The method for preparing a vanadium-extracting slag conditioner disclosed in this invention is simple and has low preparation cost. Currently, ferrosilicon, potassium / sodium feldspar, and quartz sand are commonly used for vanadium extraction and slag conditioning in China, which suffer from high preparation costs and complex preparation processes. However, the method for preparing the vanadium-extracting slag conditioner disclosed in this invention involves providing raw materials in a specified ratio, mixing them, and then granulating them to obtain the finished slag conditioner. Therefore, the entire process is simple, with few steps and requires minimal equipment, thus significantly reducing the cost of preparing the slag conditioner of this invention.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0024] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Detailed Implementation

[0025] A vanadium-extraction slag conditioner, wherein the slag conditioner is composed of the following weight percentages: 4-6% Al2O3, 15-22% SiO2, 70-75% FeO, and 1.5-3% MgO, wherein the mass ratio of Al2O3 to MgO is 1.2-4.

[0026] It is understood that the vanadium-reducing slag conditioner involved in this invention, by adjusting the appropriate proportions of slag conditioner, adding suitable Al2O3 and SiO2, increasing the proportion of FeO in the slag conditioner, and adjusting the ratio of MgO to Al2O3, setting the mass ratio of Al2O3 to MgO to 1.2-4, results in good slag-forming effect, fast slag-forming speed, and effective reduction of MFe content and residual vanadium in the slag. At the same time, the raw materials are all simple and low-cost components, solving the problems of high cost, inconvenience in furnace feeding, high MFe content in slag, and high residual vanadium in semi-steel of existing slag conditioners.

[0027] Specifically, by controlling the mass ratio of Al2O3 to MgO, the content of MgO is increased. MgO is a basic oxide; when the MgO content in the slag increases, free oxygen ions are added to the system. These free oxygen ions interact with bridging oxygen, causing the Si-OO bonds to break, and AlO4... - and SiO4 -The bonds between the slag particles are broken, which makes the slag structure more complex, thereby increasing the heat storage capacity of the slag system, lowering the melting point of the vanadium slag conditioner, ensuring good fluidity of the vanadium slag, ensuring the slag-iron separation capacity of the vanadium slag system, and reducing the amount of metallic iron in the vanadium slag.

[0028] In some embodiments of the present invention, a preferred embodiment is provided in which the slag conditioner is composed of the following weight percentages: 5% Al2O3, 20% SiO2, 72% FeO, and 3% MgO.

[0029] In some embodiments of the present invention, the particle size of the Al2O3 is 100-150 mesh. It is understood that setting the particle size of Al2O3 to 100-150 mesh is beneficial to the reaction between Al2O3 and slag, further increasing the slag formation speed, resulting in rapid slag formation and fast slag formation.

[0030] In some embodiments of the present invention, the particle size of the SiO2 is 80-105 mesh.

[0031] In some embodiments of the present invention, the FeO particle size is 70-85 mesh.

[0032] It is evident that the finer particle size of the raw materials in this invention improves the slag-forming effect of the slag conditioner, increases the slag-forming rate of the system, and reduces the MFe content in the slag and the residual V in the semi-steel.

[0033] In some embodiments of the present invention, the melting point of the slag conditioner is less than 1200°C.

[0034] This invention also provides a method for preparing a vanadium-extracting slag conditioner, comprising the following steps:

[0035] S1. Weigh the raw materials according to the proportion, mix them for the first processing time, and obtain the first raw material;

[0036] S2. The first raw material is introduced into the granulation device for molding and granulation for a second processing time to obtain the finished granular slag conditioner.

[0037] It is understandable that the commonly used materials for vanadium extraction and slag conditioning in China are ferrosilicon, potassium / sodium feldspar, and quartz sand, which have the disadvantages of high cost and complex preparation. However, the method for preparing a vanadium extraction and slag conditioning agent disclosed in this invention involves providing raw materials in a specific ratio, mixing them, and then granulating them to obtain the finished slag conditioning agent. This demonstrates a simple process with few steps and minimal equipment requirements, thus significantly reducing the cost of preparing the slag conditioning agent of this invention.

[0038] In some embodiments of the present invention, the granulation apparatus may be a granulator or other device capable of forming a first raw material into granules.

[0039] In some embodiments of the present invention, the first processing time is 1 to 3 hours.

[0040] In some embodiments of the present invention, the second processing time is 3 to 4 hours.

[0041] In some embodiments of the present invention, the diameter of the finished granular slag conditioner is 10-13 mm. It is understood that adjusting the diameter of the finished slag conditioner to 10-13 mm can increase the reaction rate of the slag conditioner in the system, thereby improving the slag formation rate and optimizing the slag formation effect.

[0042] Example 1

[0043] A vanadium-extraction slag conditioner 1 comprises the following weight percentages: 4% Al₂O₃, 19% SiO₂, 75% FeO, and 2% MgO, wherein the mass ratio of Al₂O₃ to MgO is 1.2. The Al₂O₃ has a particle size of 110 mesh. The SiO₂ has a particle size of 80 mesh. The FeO has a particle size of 71 mesh. The melting point of the slag conditioner is less than 1200℃.

[0044] Example 2

[0045] A vanadium-extraction slag conditioner 2 comprises the following weight percentages: 4.5% Al₂O₃, 20% SiO₂, 74% FeO, and 1.5% MgO, wherein the mass ratio of Al₂O₃ to MgO is 1.5. The Al₂O₃ has a particle size of 120 mesh. The SiO₂ has a particle size of 89 mesh. The FeO has a particle size of 85 mesh. The melting point of the slag conditioner is less than 1200℃.

[0046] Example 3

[0047] A vanadium-extraction slag conditioner 3 comprises the following weight percentages: 4% Al₂O₃, 20% SiO₂, 74.5% FeO, and 1.5% MgO, wherein the mass ratio of Al₂O₃ to MgO is 1.2. The Al₂O₃ has a particle size of 110 mesh. The SiO₂ has a particle size of 80 mesh. The FeO has a particle size of 71 mesh. The melting point of the slag conditioner is less than 1200℃.

[0048] Example 4

[0049] A vanadium-extraction slag conditioner 4 comprises the following weight percentages: 4% Al₂O₃, 21% SiO₂, 73.5% FeO, and 1.5% MgO, wherein the mass ratio of Al₂O₃ to MgO is 1.2. The Al₂O₃ has a particle size of 110 mesh. The SiO₂ has a particle size of 80 mesh. The FeO has a particle size of 71 mesh. The melting point of the slag conditioner is less than 1200℃.

[0050] Example 5

[0051] A vanadium-extraction slag conditioner 5 comprises the following weight percentages: 4% Al₂O₃, 20% SiO₂, 74.5% FeO, and 1.5% MgO, wherein the mass ratio of Al₂O₃ to MgO is 1.3. The Al₂O₃ has a particle size of 120 mesh. The SiO₂ has a particle size of 80 mesh. The FeO has a particle size of 83 mesh. The melting point of the slag conditioner is less than 1200℃.

[0052] Example 6

[0053] A vanadium-extraction slag conditioner 6 comprises the following weight percentages: 4% Al₂O₃, 21% SiO₂, 73.5% FeO, and 1.5% MgO, wherein the mass ratio of Al₂O₃ to MgO is 2.6. The Al₂O₃ has a particle size of 100 mesh. The SiO₂ has a particle size of 80 mesh. The FeO has a particle size of 82 mesh. The melting point of the slag conditioner is less than 1200℃.

[0054] Example 7

[0055] A vanadium-extraction slag conditioner 7 comprises the following weight percentages: 6% Al₂O₃, 19% SiO₂, 73.5% FeO, and 1.5% MgO, wherein the mass ratio of Al₂O₃ to MgO is 4. The Al₂O₃ has a particle size of 110 mesh. The SiO₂ has a particle size of 80 mesh. The FeO has a particle size of 71 mesh. The melting point of the slag conditioner is less than 1200℃.

[0056] Example 8

[0057] A vanadium-extraction slag conditioner 8 comprises the following weight percentages: 5% Al₂O₃, 20% SiO₂, 72% FeO, and 3% MgO, wherein the mass ratio of Al₂O₃ to MgO is 1.6. The Al₂O₃ has a particle size of 140 mesh. The SiO₂ has a particle size of 98 mesh. The FeO has a particle size of 78 mesh. The melting point of the slag conditioner is less than 1200℃.

[0058] Experimental Example 1. Performance testing of the slag conditioner of the present invention.

[0059] 1.1 Experimental Design

[0060] The slag conditioner 1-4 involved in Examples 1-4 was selected as treatment group 1-4, and a commercially available slag conditioner was selected as control group. They were applied to the slag condition adjustment of vanadium slag, and the MFe content and residual V content in the slag were detected. The test results are shown in the table below.

[0061] 1.2 Results Analysis

[0062] MFe in slag (%) Semi-steel residual V (%) Processing Group 1 15 0.0321 Processing Group 2 16 0.0352 Processing Group 3 17 0.0386 Processing Group 4 18 0.0395 control group 22 0.0500

[0063] Referring to the table above, the MFe content in the slag of treatment groups 1-4 involved in this invention is all low, all below 18%, indicating that the slag conditioning effect is good. In addition, the residual V in the semi-steel is also low, all below 0.04%.

[0064] Compared with treatment groups 1-4, the control group of commercially available slag conditioners had a worse slag conditioning effect, with a higher Fe content (22%) and a higher residual V content (0.05%) in the slag.

[0065] In summary, the vanadium-reducing slag conditioner of this invention, by adjusting the appropriate proportions of slag conditioner, adding suitable Al2O3 and SiO2, increasing the proportion of FeO in the slag conditioner, and adjusting the ratio of MgO to Al2O3, setting the mass ratio of Al2O3 to MgO to 1.2-4, results in good slag-forming effect, fast slag-forming speed, and effective reduction of MFe content and residual vanadium in the slag. Simultaneously, the raw materials are all simple and low-cost components, solving the problems of high cost, inconvenience in furnace feeding, high MFe content in slag, and high residual vanadium in semi-steel of existing slag conditioners.

[0066] The above embodiments are merely one implementation of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A vanadium-extracting slag conditioner, characterized in that, The slag conditioner is composed of the following weight percentages: 4-6% Al2O3, 15-22% SiO2, 70-75% FeO, and 1.5-3% MgO, wherein the mass ratio of Al2O3 to MgO is 1.2-4; the particle size of Al2O3 is 100-150 mesh, the particle size of SiO2 is 80-105 mesh, the particle size of FeO is 70-85 mesh, and the melting point of the slag conditioner is less than 1200℃.

2. The vanadium extraction and slag conditioning agent according to claim 1, characterized in that, The slag conditioner consists of the following weight percentages: 5% Al2O3, 20% SiO2, 72% FeO, and 3% MgO.

3. A method for preparing a vanadium-extracting slag conditioner according to any one of claims 1 to 2, characterized in that, Includes the following steps: S1. Weigh the raw materials according to the proportion, mix them for the first processing time, and obtain the first raw material; S2. The first raw material is introduced into the granulation device for molding and granulation for a second processing time to obtain the finished granular slag conditioner.

4. The method for preparing a vanadium-extracting slag conditioner according to claim 3, characterized in that, The first processing time is 1 to 3 hours.

5. The method for preparing a vanadium-extracting slag conditioner according to claim 3, characterized in that, The second processing time is 3 to 4 hours.

6. The method for preparing a vanadium-extracting slag conditioner according to claim 3, characterized in that, The diameter of the finished granular slag conditioner is 10-13 mm.