Method for predicting drum strength of vanadium-titanium sinter

Abstract

According to the method for predicting the drum strength of the vanadium-titanium sinter, the drum strength of the vanadium-titanium sinter is predicted through three components of TiO2, SiO2 and CaO in a vanadium-titanium sinter mixture, and the drum strength of the vanadium-titanium sinter is predicted through the interaction effect of TiO2, SiO2 and CaO added in prediction. And the interaction influence of TiO2 and R and the influence of SiO2 + CaO on the drum strength of the vanadium-titanium sinter are fully considered, so that the prediction is more comprehensive, scientific and accurate.

Description

Technical Field

[0001] This invention belongs to the field of iron and steel metallurgy technology, and particularly relates to a method for predicting the drum strength of vanadium-titanium sinter. Background Technology

[0002] The quality of sinter directly affects the stable operation of the blast furnace. The sinter production process requires different types of iron concentrate to be mixed in calculated proportions and sintered to obtain finished sinter. Then, samples are taken and graded, and the drum strength of the sinter is tested manually. This method is simple, direct, and relatively accurate. However, due to the special nature of the equipment and the lag in the sintering process, this process is relatively long, resulting in a serious lag in the test data. From sintering batching to obtaining the drum strength of the sinter, the time is more than 5 hours, making it difficult to predict changes in sinter quality in real time.

[0003] The research and application of a sinter quality prediction system based on a combined model by Shao Huijun of Wuhan University of Science and Technology, based on the analysis of the sintering process mechanism and its characteristics, summarizes the main factors affecting sinter quality and establishes a sinter quality prediction model. The "Sinter Drum Strength Prediction Model and System Based on an Improved Transformer Network" can also predict sinter strength and other indicators relatively well. However, these models require many complex parameters and are designed for ordinary sintering without TiO2. In such cases, TiO2 in the raw materials undergoes complex reactions during sintering, and ilmenite in vanadium-titanium ore is difficult to fully react with fluxes (such as limestone and silicon-containing materials) to form a crystalline phase, resulting in unstable and highly variable sinter quality. Therefore, the ability to quickly and accurately predict the drum strength of sinter to provide support for blast furnace production operations is particularly important. Summary of the Invention

[0004] The purpose of this invention is to provide a method for predicting the drum strength of vanadium-titanium sinter. The method in this invention fully considers the interaction between TiO2 and R and the influence of SiO2+CaO on the drum strength of vanadium-titanium sinter, making the prediction more comprehensive, scientific and accurate.

[0005] This application provides a method for predicting the drum strength of vanadium-titanium sinter, which calculates the TiO2 content W in the sinter based on the sintering batching parameters. TiO2 %, basicity R of sinter and mass fraction W of CaO+SiO2 in sinter CaO+SiO2 %, and the thickness of the sintered ore layer H mm;

[0006] Among them, 2.5%≤W TiO2 % < 7.5%, when 5.0% ≤ W TiO2 % < 7.5%,

[0007] Vanadium-titanium sinter drum strength = 0.8618 × (W)TiO2 ) 0.087 +0.5561×R 0.171 +TiO2×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+69;

[0008] When 2.5%≤W TiO2 % < 5.0%,

[0009] The strength of the vanadium-titanium sinter drum is 1.944 × W. TiO2 +0.5561×R 0.171 + W TiO2 ×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+80.5.

[0010] Preferably, the basicity R of the sinter is the ratio of the mass fraction of CaO to the mass fraction of SiO2 in the sinter; 1.6≤R≤2.5.

[0011] Preferably, the sintered ore layer thickness Hmm is the thickness of the sintered ore layer in the sintering device during sintering; 600mm≤Hmm≤900mm.

[0012] Preferably, 15% ≤ W CaO+SiO2 %≤23%.

[0013] Preferably, the mass fraction of FeO in the sinter is 7.2-8.8%.

[0014] Preferably, the TFe content in the sinter is 47-52%.

[0015] Preferably, the water content in the mixture after the sintering ingredients are mixed is 7.0~8.0% by mass.

[0016] Preferably, the temperature of the mixture is 50~70℃.

[0017] Preferably, the sintering feedstock comprises iron concentrate in the following mass fractions:

[0018] Vanadium-titanium iron concentrate: 10-70%,

[0019] High-grade iron concentrate: 20-60%,

[0020] Medium-grade iron concentrate: 5-30%.

[0021] Preferably, the mass fraction of TiO2 in the vanadium-titanium iron concentrate is 8-13%, and the mass fraction of TFe in the vanadium-titanium iron concentrate is 53-60%.

[0022] The TFe content in high-grade iron concentrate is 55-65%;

[0023] The TFe content in medium-grade iron concentrate is 40-50%.

[0024] This invention provides a method for predicting the drum strength of vanadium-titanium sinter, which calculates the TiO2 content W in the sinter based on sintering batching parameters. TiO2 %, basicity R of sinter and mass fraction W of CaO+SiO2 in sinter CaO+SiO2 %, and the thickness H of the sintered ore layer; where 2.5%≤W TiO2 % < 7.5%, when 5.0% ≤ W TiO2 % < 7.5%, vanadium-titanium sinter drum strength = 0.8618 × (W) TiO2 ) 0.087 +0.5561×R 0.171 +TiO2×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+69; when 2.5%≤W TiO2 % < 5.0%, vanadium-titanium sinter drum strength = 1.944 × W TiO2 +0.5561×R 0.171 + W TiO2 ×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2This invention predicts the drum strength of vanadium-titanium sinter by using the three components TiO2, SiO2, and CaO in the vanadium-titanium sintering mixture. Furthermore, it incorporates the interactive effects of TiO2, SiO2, and CaO into the prediction, fully considering the interaction between TiO2 and R, as well as the influence of SiO2+CaO on the drum strength of vanadium-titanium sinter, making the prediction more comprehensive, scientific, and accurate. Detailed Implementation

[0025] This invention provides a method for predicting the drum strength of vanadium-titanium sinter, which calculates the TiO2 content W in the sinter based on sintering batching parameters. TiO2 %, basicity R of sinter and mass fraction W of CaO+SiO2 in sinter CaO+SiO2 %, and the thickness of the sintered ore layer H mm;

[0026] Among them, 2.5%≤W TiO2 % < 7.5%, when 5.0% ≤ W TiO2 % < 7.5%,

[0027] Vanadium-titanium sinter drum strength = 0.8618 × (W) TiO2 ) 0.087 +0.5561×R 0.171 +TiO2×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+69;

[0028] When 2.5%≤W TiO2 % < 5.0%,

[0029] The strength of the vanadium-titanium sinter drum is 1.944 × W. TiO2 +0.5561×R 0.171 + W TiO2 ×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+80.5.

[0030] This invention first involves sintering the raw materials, which means mixing the various raw materials to obtain a mixture. Then, the mixture is placed in a sintering machine for sintering to obtain sintered ore. This invention uses raw materials to formulate the ore under a certain range of mixture parameters, and calculates the relevant parameters of the three components TiO2, SiO2, and CaO in the sintered ore through the sintering batching parameters. The drum strength of vanadium-titanium sintered ore is predicted by using the calculated parameters of the sintered ore.

[0031] In this invention, the iron-containing raw material includes iron concentrate, specifically vanadium-titanium iron concentrate, high-grade iron concentrate, and medium-grade iron concentrate. The mass fraction of TiO2 in the vanadium-titanium iron concentrate is preferably 8-13%, more preferably 9-12%, such as 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, and 12%, preferably within a range where any of the above values ​​is the upper or lower limit. The mass fraction of the vanadium-titanium iron concentrate is preferably 10-70%, more preferably 20-70%, such as 10%. The TFe content in the vanadium-titanium iron concentrate is preferably 53-60%, more preferably 55-60%, such as 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, preferably within the range of values ​​mentioned above as the upper or lower limit; the TFe content in the high-grade iron concentrate is preferably 55%. The high-grade iron concentrate has a mass fraction of 20-65%, more preferably 58-62%, such as 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, preferably within a range where any of the above values ​​are the upper or lower limit; the high-grade iron concentrate has a mass fraction of 20-60%, more preferably 30-50%, such as 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, preferably within a range where any of the above values ​​are the upper or lower limit; The TFe content in the medium-grade iron concentrate is preferably 40-50%, more preferably 42-48%, such as 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, preferably within the range of any of the above values ​​as the upper or lower limit; the mass fraction of the medium-grade iron concentrate is preferably 5-25%, more preferably 10-20%, such as 5%, 10%, 15%, 20%, 25%, preferably within the range of any of the above values ​​as the upper or lower limit.

[0032] In this invention, the moisture content of the mixture is preferably 7.0-8.0%, such as 7.0%, 7.1%, 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, 8.0%, preferably within the range of any of the above values ​​as the upper or lower limit; the temperature of the mixture is preferably 50-70°C, more preferably 60-70°C.

[0033] Based on the parameters of the above mixture, the present invention calculates the TiO2 content W in the sinter. TiO2 %, basicity R of sinter and mass fraction W of CaO+SiO2 in sinter CaO+SiO2 %, and combined with the sinter bed thickness H mm, the sinter drum strength is calculated according to the following formula:

[0034] Among them, 2.5%≤W TiO2 % < 7.5%, when 5.0% ≤ W TiO2 % < 7.5%,

[0035] Vanadium-titanium sinter drum strength = 0.8618 × (W) TiO2 ) 0.087 +0.5561×R 0.171 +TiO2×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+69;

[0036] When 2.5%≤W TiO2 % < 5.0%,

[0037] The strength of the vanadium-titanium sinter drum is 1.944 × W. TiO2 +0.5561×R 0.171 + W TiO2 ×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+80.5.

[0038] In this invention, the W TiO2 % represents the percentage of TiO2 in sinter predicted under certain mixed conditions, expressed in %;

[0039] R represents the predicted basicity (CaO / SiO2 ratio) of the sinter under certain mixed conditions.

[0040] Hmm is the thickness of the material layer when sintering ore in the sintering machine, in mm, where H is the thickness value;

[0041] W CaO+SiO2 % represents the percentage of CaO+SiO2 in sinter predicted and calculated under certain mixed conditions.

[0042] In this invention, R is preferably 1.6 to 2.5, more preferably 1.8 to 2.2, such as 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, and preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0043] In this invention, Hmm is preferably 600mm to 900mm, more preferably 700mm to 800mm, such as 600 mm, 650 mm, 700 mm, 750 mm, 800 mm, 850 mm, 900 mm, and preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0044] In this invention, W CaO+SiO2 The percentage is preferably 15% to 23%, more preferably 18% to 20%, such as 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, and preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0045] In this invention, the mass fraction of FeO in the sinter is preferably 7.2-8.8%, more preferably 7.5-8.5%, such as 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, 8.0%, 8.1%, 8.2%, 8.3%, 8.4%, 8.5%, 8.6%, 8.7%, 8.8%, preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0046] In this invention, the TFe content in the sinter is preferably 47-52%, more preferably 48-50%, such as 47%, 48%, 49%, 50%, 51%, 52%, and preferably within the range of values ​​above, which may be the upper or lower limits.

[0047] This invention provides a method for predicting the drum strength of vanadium-titanium sinter, which calculates the TiO2 content W in the sinter based on sintering batching parameters. TiO2 %, basicity R of sinter and mass fraction W of CaO+SiO2 in sinter CaO+SiO2 %, and the thickness of the sintered ore layer H mm; of which, 2.5%≤WTiO2 % < 7.5%, when 5.0% ≤ W TiO2 % < 7.5%, vanadium-titanium sinter drum strength = 0.8618 × (W) TiO2 ) 0.087 +0.5561×R 0.171 +TiO2×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+69; when 2.5%≤W TiO2 % < 5.0%, vanadium-titanium sinter drum strength = 1.944 × W TiO2 +0.5561×R 0.171 + W TiO2 ×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 This invention predicts the drum strength of vanadium-titanium sinter by using the three components TiO2, SiO2, and CaO in the vanadium-titanium sintering mixture. Furthermore, it incorporates the interactive effects of TiO2, SiO2, and CaO into the prediction, fully considering the interaction between TiO2 and R, as well as the influence of SiO2+CaO on the drum strength of vanadium-titanium sinter, making the prediction more comprehensive, scientific, and accurate.

[0048] To further illustrate the present invention, the following detailed description of a method for predicting the drum strength of vanadium-titanium sinter provided by the present invention is provided in conjunction with embodiments, but it should not be construed as limiting the scope of protection of the present invention.

[0049] Example 1

[0050] Sinter mix proportions: 75% vanadium-titanium iron concentrate (TFe 57.33%), 5% high-grade iron concentrate (TFe 58.47%), 20% medium-grade iron concentrate (TFe 42.31%), and 13% flux hydrated lime (CaO 88.23%). Under the conditions of 7.2% moisture content, 55℃ mixing temperature, and 650mm sinter layer thickness, the sinter was calculated to contain TiO2 (7.37%), basicity (1.84), FeO (7.73%), CaO+SiO2 (15.5%), and TFe (49.18%). Using the formula, the predicted sinter drum strength was 72.20%. After obtaining the finished sinter through on-site sintering experiments in sintering cups, the drum strength was measured to be 72.42%, with an error of 0.30%.

[0051] Example 2

[0052] Sinter mix proportions: 63% vanadium-titanium iron concentrate (TFe 57.33%), 27% high-grade iron concentrate (TFe 58.47%), 10% medium-grade iron concentrate (TFe 42.31%), and 13% flux hydrated lime (CaO 88.23%) externally. Under the conditions of 7.2% moisture content, 55℃ mixing temperature, and 710mm sinter layer thickness, the sinter was calculated to contain TiO2 (6.39%), basicity (1.89), FeO (7.79%), CaO+SiO2 (15.7%), and TFe (50.28%). Using the formula, the predicted sinter drum strength was 72.37%. After obtaining the finished sinter through on-site sintering experiments in sintering cups, the drum strength was measured to be 72.58%, with an error of 0.29%.

[0053] Example 3

[0054] Sinter mix proportions: 40% vanadium-titanium iron concentrate (TFe 57.33%), 45% high-grade iron concentrate (TFe 58.47%), 15% medium-grade iron concentrate (TFe 42.31%), and 13% flux hydrated lime (CaO 88.23%). Under the conditions of 7.5% moisture content, 60℃ mixing temperature, and 750mm sinter layer thickness, the sinter was calculated to have the following parameters: TiO2 4.86%, basicity 2.06, FeO 8.28%, CaO+SiO2 16.9%, and TFe 50.89%. Using a formula, the predicted sinter drum strength was 74.05%. After obtaining the finished sinter through on-site sintering experiments in sintering cups, the drum strength was measured to be 74.58%, with an error of 0.71%.

[0055] Example 4

[0056] Sinter mix proportions: 27% vanadium-titanium iron concentrate (TFe 57.33%), 40% high-grade iron concentrate (TFe 58.47%), 33% medium-grade iron concentrate (TFe 42.31%), and 13% flux hydrated lime (CaO 88.23%) externally. Under the conditions of 7.4% moisture content, 55℃ mixing temperature, and 760mm sinter layer thickness, the sinter was calculated to contain TiO2 (3.24%), basicity (2.15), FeO (8.55%), CaO+SiO2 (22.4%), and TFe (47.79%). Using the formula, the predicted sinter drum strength was 77.32%. After obtaining the finished sinter through on-site sintering experiments in sintering cups, the drum strength of the sinter was measured to be 78.09%, with an error of 0.99%.

[0057] 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 predicting the drum strength of vanadium-titanium sinter, characterized in that, The TiO2 content W in the sinter was calculated based on the sintering batching parameters. TiO2 %, basicity R of sinter and mass fraction W of CaO+SiO2 in sinter CaO+SiO2 %, and the thickness of the sintered ore layer H mm; Among them, 2.5%≤W TiO2 % < 7.5%, when 5.0% ≤ W TiO2 % < 7.5%, Vanadium-titanium sinter drum strength = 0.8618 × (W) TiO2 ) 0.087 +0.5561×R 0.171 +TiO2×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+69; When 2.5%≤W TiO2 % < 5.0%, The strength of the vanadium-titanium sinter drum is 1.944 × W. TiO2 +0.5561×R 0.171 + W TiO2 ×R×10 -2 +(H 2 ×10 -6 +0.001873×H)+((W CaO+SiO2 ) 2 ×10 -4 +0.1531×(W CaO+SiO2 ))+80.

5.

2. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, The basicity R of the sinter is the ratio of the mass fraction of CaO to the mass fraction of SiO2 in the sinter; 1.6≤R≤2.

5.

3. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, The thickness H of the sintered ore bed is the thickness of the sintered ore bed in the sintering device during sintering; 600mm≤H≤900mm.

4. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, 15%≤W CaO+SiO2 %≤23%。 5. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, The mass fraction of FeO in the sinter is 7.2-8.8%.

6. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, The TFe content in the sinter is 47-52%.

7. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, The mass content of moisture in the mixture after the sintering ingredients are mixed is 7.0~8.0%.

8. The method for predicting the drum strength of vanadium-titanium sinter according to claim 7, characterized in that, The temperature of the mixture is 50~70℃.

9. The method for predicting the drum strength of vanadium-titanium sinter according to claim 1, characterized in that, The sintering feedstock includes the following iron concentrate by mass fraction: Vanadium-titanium iron concentrate: 10-70%, High-grade iron concentrate: 20-60%, Medium-grade iron concentrate: 5-30%.

10. The method for predicting the drum strength of vanadium-titanium sinter according to claim 9, characterized in that, The mass fraction of TiO2 in vanadium-titanium iron concentrate is 8-13%, and the mass fraction of TFe in vanadium-titanium iron concentrate is 53-60%. The TFe content in high-grade iron concentrate is 55-65%; The TFe content in medium-grade iron concentrate is 40-50%.