Method for detecting high temperature performance of iron ore powder

A technology of high temperature performance and iron ore powder, applied in the field of testing the performance of sintered pellets, to achieve the effect of comprehensive performance and strong adaptability

Active Publication Date: 2015-03-25
武汉钢铁有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of existing iron ore powder high-temperature performance detection methods, the present invention proposes a method that does not need to be ground, divides iron ore into different particle sizes, and uses different particl...
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Abstract

The invention relates to a method for detecting high temperature performance of iron ore powder. The method comprises the steps of drying the iron ore powder, grading the size of the iron ore powder into a grade more than 3mm, a grade in the range of 1 to 3mm and a grade of less than 1mm; adding pure calcium oxide or calcium hydroxide for regulating alkalinity to 0, 1.0, 2.0, 3.0 according to SiO2 amount in the iron ore powder; adding an organic adhesive and water, stirring the organic adhesive, water and the iron ore powder to obtain a mixture, and pressing the mixture into cakes; heating the cakes in different temperature sections, and judging the difficulty in generating a liquid phase; calculating a fluidity index of the liquid phase, and judging the high temperature performance. Since the high temperature performance of the iron ore powder is determined under the condition of original particles of iron ore, the detection data is instructive and high in applicability; moreover, since the data in a series of alkalinity range is detected, the reflected performance is more comprehensive.

Application Domain

Technology Topic

Examples

  • Experimental program(4)

Example Embodiment

[0026] Example 1
[0027] The mineral is specularite, and the alkalinity of this mineral is 0 and 1.0.
[0028] A method for detecting high temperature performance of iron ore powder, and its steps:
[0029] 1) Dry the specularite powder: the drying temperature is 105°C, and the time is 2.2 hours; after drying, the specularite powder is classified into particle sizes greater than 3mm, 1-3mm, and less than 1mm. ; The weight percentage of specularite powder with a particle size of less than 1mm reaches 61.3%, and it is used as a testing material;
[0030] 2) Specularite powder with a particle size of less than 1mm contains SiO 2 It is 4.24%, so by adding pure calcium oxide to make the alkalinity reach 0 and 1.0 respectively, and mix the specularite powder and pure calcium oxide uniformly; after mixing and adjusting, the alkalinity of 0 and 1.0 The total weights are 68.7 g and 70.5 g respectively;
[0031] 3) In specularite powder with alkalinity reaching 0 and 1.0, add organic binder according to 5% of the total amount of specularite powder with different alkalinity, and add water according to 6%; in organic binder and Stir evenly after adding water; the mass of each pie-shaped sample is weighed according to 5g to make a pie-shaped sample, the diameter of each pie-shaped sample is 2cm; the bottom area of ​​each is 3.228 cm 2
[0032] 4) Put the cake-shaped samples of specularite powder with alkalinity of 0 and 1.0 on a high-temperature resistant plate 5 times larger than the bottom area of ​​the cake-shaped sample, and push them into the heating furnace for heating at different temperature sections:
[0033] A. Use 2.5 minutes to raise the cake sample from room temperature to 450°C;
[0034] B. Use 4 minutes to increase the temperature of the cake sample to 980°C;
[0035] C. Raise the temperature of the cake sample to 1085°C within 2 minutes;
[0036] D. Detect the assimilation temperature point and judge the difficulty of the liquid phase formation of the ore: Continue heating, when the temperature continues to rise to 1350℃, the surface of the cake-shaped sample with an alkalinity of 1.0 begins to appear ablation at this temperature Then it is the assimilation temperature of the cake-like sample with an alkalinity of 1.0; and keep it at this assimilation temperature for 2 minutes; when the temperature continues to rise to 1450°C, the surface of the cake-like sample with an alkalinity of 0 begins to appear erosion phenomenon, this temperature It is the assimilation temperature of the cake-like sample with an alkalinity of 0; keep it at this assimilation temperature for 2 minutes;
[0037] Judgment: This phenomenon shows that specularite powder with an alkalinity of 1.0 is relatively easier to form a liquid phase than specularite powder with an alkalinity of 0, but it is more difficult to form a liquid phase;
[0038] E. Calculate the liquid phase fluidity index of specularite powder and judge the high-temperature performance of the ore: when heated to any temperature between 1250°C and less than 1350°C, specularite with alkalinity of 0 and 1.0 There is no melting phenomenon in the powdered cake-like samples, so there is no problem of area increase in the two cake-like samples, that is, f 1 = f 2 , So the liquid phase flow index A is 0; continue heating, when the heating is continued to 1380℃, the liquid phase on the surface of the cake-shaped sample with an alkalinity of 1.0 is flat, and the liquid phase after scanning is calculated The area is 4.508cm 2 At this time, the area of ​​the cake-shaped sample with an alkalinity of 0 has not changed; when the heating is continued to 1485℃, the liquid phase on the surface of the cake-shaped sample with an alkalinity of 1.0 is open, which is calculated by scanning The area after the liquid phase is open is 7.685cm 2;The area of ​​the liquid phase of the cake-shaped sample with an alkalinity of 0 is calculated to be 3.425 cm by scanning 2; Since the temperature is close to 1500℃, stop heating;
[0039] Calculate the liquid flow index corresponding to the cake-shaped sample at different levels of temperature, which is calculated according to the following formula: Known:
[0040] Cake sample f of specularite powder with alkalinity of 0 and 1.0 2 The bottom area is 3.228 cm 2 , The mass w of the two pie-shaped samples before heating is 5g, and the liquid-phase beach area f of the pie-shaped sample with an alkalinity of 1.0 at 1380℃ 1 =4.508cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with alkalinity 1.0 at 1380℃ is 0.256 cm 2 /g; the liquid-phase beach area f at 1485℃ for a cake sample with an alkalinity of 1.0 1 =7.685cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake-like sample with an alkalinity of 1.0 at 1485℃ is 0.891 cm 2 /g;
[0041] Liquid-phase beach area f at 1485℃ for a cake sample with an alkalinity of 0 1 = 3.425 cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with alkalinity of 0 at 1485℃ is 0.040 cm 2 /g;
[0042] Judgment: the liquid fluidity index A at 1485℃ for the cake-like sample with alkalinity of 0 is 0.040 cm 2 /g, indicating that the high temperature performance of specularite powder is poor; further indicating that the cake-like sample with an alkalinity of 0 has poor high temperature performance within 1485℃;
[0043] The liquid phase fluidity index A of the cake sample with an alkalinity of 1.0 at 1380℃ is 0.256 cm 2 /g, indicating that the high temperature performance of iron ore powder at this temperature section is poor, and the liquid phase fluidity index A at 1485℃ is 0.891 cm 2 /g, its high temperature performance in this temperature range is general.

Example Embodiment

[0044] Example 2
[0045] The mineral is specularite, and the alkalinity of this mineral is 2.0 and 3.0.
[0046] And its method for detecting the high temperature performance of specularite powder, its steps:
[0047] 1) Dry the specularite powder: the drying temperature is 105°C, and the time is 2.2 hours; after drying, the specularite powder is classified into particle sizes greater than 3mm, 1-3mm, and less than 1mm. ; The weight percentage of specularite powder with a particle size of less than 1mm reaches 61.3%, and it is used as a testing material;
[0048] 2) Spectrinite powder with a particle size of less than 1mm contains SiO 2 It is 4.24%, so by adding pure calcium oxide to make the alkalinity reach 2.0 and 3.0 respectively, and mix the specularite powder and pure calcium oxide uniformly; after mixing and adjusting, the alkalinity of 2.0 and 3.0 are respectively The total weights are 69.2 g and 71.8 g respectively;
[0049] 3) In specularite powder with alkalinity reaching 2.0 and 3.0 respectively, add organic binder according to 5% of the total amount of mirrorite powder with different alkalinity, and add water according to 6%; in organic binder and Stir evenly after adding water; the mass of each pie-shaped sample is weighed according to 5g to make a pie-shaped sample, the diameter of each pie-shaped sample is 2cm; the bottom area of ​​each is 3.228 cm 2
[0050] 4) Put the cake-shaped samples of specularite powder with alkalinity of 2.0 and 3.0 on a high-temperature resistant plate 5 times larger than the bottom area of ​​the cake-shaped sample, and push them into the heating furnace for heating at different temperature sections:
[0051] A. Use 2.5 minutes to raise the cake sample from room temperature to 450°C;
[0052] B. Raise the temperature of the cake sample to 990℃ in 4 minutes;
[0053] C. Raise the temperature of the cake sample to 1080 ℃ within 2 minutes;
[0054] D. Detect the assimilation temperature point and judge the difficulty of the liquid phase formation of the ore: Continue heating, when the temperature continues to rise to 1260℃, the surface of the cake-shaped sample with an alkalinity of 3.0 begins to appear ablation at this temperature Then it is the assimilation temperature of the cake-like sample with an alkalinity of 3.0, and keep it at this assimilation temperature for 2 minutes; when the temperature is continued to rise to 1310°C, the surface of the cake-like sample with an alkalinity of 2.0 begins to appear erosion at this temperature It is the assimilation temperature of the cake-like sample with an alkalinity of 2.0; keep it at this assimilation temperature for 2 minutes;
[0055] Judgment: This test phenomenon shows that specularite powder with an alkalinity of 3.0 is relatively easier to form a liquid phase than specularite powder with an alkalinity of 2.0. The difficulty of generating a liquid phase for specularite powder with an alkalinity of 3.0 is average. It is more difficult to form a liquid phase with specularite powder of 2.0;
[0056] E. Calculate the liquid phase fluidity index of specularite powder and judge the high-temperature performance of the ore: when heated to 1270℃, the surface area of ​​the cake-like sample with an alkalinity of 3.0 changes, and the surface area of ​​the liquid phase beaches Calculated as 3.314cm after scanning 2 At this time, the surface of the cake-shaped sample with an alkalinity of 2.0 does not appear to be eroded, and there is no problem of area increase, that is, f 1 = f 2 , So the liquid phase flow index A is 0; continue heating, when the heating is continued to 1320℃, the surface area of ​​the cake-shaped sample with an alkalinity of 3.0 changes, and the surface area of ​​the liquid phase is calculated to be 12.548cm by scanning 2 , At this time, the surface area of ​​the cake-like sample with an alkalinity of 2.0 changes, and the surface area of ​​the liquid phase is calculated to be 3.784cm by scanning 2; When the heating is continued to 1370℃, the liquid-phase area on the surface of the cake-shaped sample with an alkalinity of 2.0 is calculated to be 12.018cm by scanning 2; The surface area of ​​the cake-shaped sample with an alkalinity of 3.0 changes, and the liquid-phase beach area on the surface is calculated to be 17.558 cm by scanning 2; Continue heating to 1420 ℃, the liquid phase of the samples with alkalinity of 2.0 and 3.0 are all covered with gaskets, stop heating;
[0057] Calculate the liquid flow index corresponding to the cake-shaped sample at different levels of temperature, which is calculated according to the following formula: Known:
[0058] Cake-shaped sample f of specularite powder with alkalinity of 2.0 and 3.0 2 The bottom area is 3.228 cm 2 , The mass w of the two pie-shaped samples before heating is 5g, and the liquid-phase beach area f of the pie-shaped sample with an alkalinity of 3.0 at 1270℃ 1 =3.314cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with alkalinity of 3.0 at 1260℃ is 0.017cm 2 /g; the liquid-phase beach area f at 1320℃ for a cake sample with an alkalinity of 3.0 1 =12.548cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with an alkalinity of 3.0 at 1320℃ is 1.864 cm 2 /g; the liquid-phase beach area f at 1370℃ for a cake sample with an alkalinity of 3.0 1 =17.558cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with alkalinity of 3.0 at 1370℃ is 2.872 cm 2 /g;
[0059] Liquid-phase beach area f at 1320℃ for a cake-like sample with an alkalinity of 2.0 1 = 3.784 cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with alkalinity of 2.0 at 1320℃ is 0.111 cm 2 /g; The area of ​​the liquid phase beaching area of ​​a cake sample with an alkalinity of 2.0 at 1370℃ f 1 = 12.018 cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake sample with alkalinity of 2.0 at 1370℃ is 1.758 cm 2 /g;
[0060] Judgment: Because the liquid phase fluidity index A of the cake sample with an alkalinity of 3.0 at 1260℃ is 0.017 cm 2 /g, indicating that the high temperature performance of iron ore powder is poor at this temperature level; the liquid fluidity index A at 1320 ℃ for a cake sample with an alkalinity of 3.0 is 1.864 cm 2 /g, indicating that the high temperature performance of iron ore powder is good within this temperature level; because the cake sample with an alkalinity of 3.0 has a liquid phase fluidity index A of 2.872 cm at 1370℃ 2 /g, indicating that the high temperature performance of iron ore powder is excellent within this temperature level; the liquid phase fluidity index A at 1370℃ of the cake sample with an alkalinity of 2.0 is 1.758 cm 2 /g, indicating that the high temperature performance of iron ore powder is good at this temperature level, because its liquid phase fluidity index A at 1320℃ is 0.111 cm 2 /g, indicating that the high temperature performance of iron ore powder is poor within this temperature level.

Example Embodiment

[0061] Example 3
[0062] The mineral is limonite, and the tested alkalinity of this mineral is 2.0.
[0063] The method of testing its high temperature performance, its steps:
[0064] 1) Dry the limonite powder: the drying temperature is 105°C, and the time is 3 hours; after drying, the limonite powder is classified into particle sizes greater than 3mm, 1-3mm, and less than 1mm. ; Among them, the weight percentages of iron ore powder with a particle size of 1-3mm and +3mm reach 32.8% and 35.4%, respectively, and use them as testing materials;
[0065] 2) Limonite with a particle size of 1-3mm contains SiO 2 Limonite with a size of 6.34% and a particle size of +3mm contains SiO 2 It is 5.98%, so by adding pure calcium oxide to make the alkalinity reach 2.0, and mixing the limonite powder and pure calcium oxide uniformly; after mixing and adjusting, the particle size of limonite powder is 1-3mm and +3mm respectively. The total weights are 52.4 g and 54.7 g respectively;
[0066] 3) In the limonite powder with particle size of 1-3mm and +3mm, add organic binder according to 5% of the total amount of limonite powder of different particle sizes, and add water according to 7.5%; in organic binder After adding water and water, stir evenly; the mass of each pie-shaped sample is weighed according to 4g to make a pie-shaped sample, the diameter of each pie-shaped sample is 2cm; the bottom area of ​​each is 3.228 cm 2
[0067] 4) Put the cake-shaped samples of limonite powder with the particle size of 1-3mm and +3mm on the high-temperature resistant plate 4 times larger than the bottom area of ​​the cake-shaped sample, and push them into the heating furnace for heating in different temperature sections. :
[0068] A. Raise the cake sample from room temperature to 450°C in 2 minutes;
[0069] B. Use 3 minutes to increase the temperature of the cake sample to 1000℃;
[0070] C. Raise the temperature of the cake sample to 1090℃ within 2 minutes;
[0071] D. Detect the assimilation temperature point and judge the difficulty of the liquid phase formation: Continue heating, when the temperature continues to rise to 1260℃, the surface of the cake-like sample of limonite powder with a particle size of 1-3mm begins to appear For the melting phenomenon, this temperature is the assimilation temperature of the limonite powder cake-like sample with a particle size of 1-3mm; and keep it at this assimilation temperature for 2 minutes; when the temperature continues to rise to 1270℃, the particle size is +3mm limonite The surface of the cake-like sample of the mineral powder begins to corrode. This temperature is the assimilation temperature of the limonite powder cake-like sample with a particle size of +3mm; and keep it at this assimilation temperature for 2 minutes;
[0072] Judgment: This test phenomenon shows that the limonite powder with a particle size of 1-3mm is easy to form a liquid phase relative to the limonite powder with a particle size of +3mm, but it is difficult for both of them to form a liquid phase;
[0073] E. Calculate the liquid phase fluidity index of the limonite powder and judge the high-temperature performance of the ore: when heated to 1270°C, the surface area of ​​the limonite powder cake-like sample with a particle size of 1-3mm changes, and The open area of ​​the surface liquid phase is calculated to be 4.476 cm by scanning 2 At this time, the area of ​​the cake-shaped sample of limonite powder with a particle size of +3mm changes, and the surface area of ​​the liquid phase is calculated to be 3.276cm by scanning 2; Continue heating, when the heating is continued to 1310℃, the surface area of ​​the cake-like sample of limonite powder with a particle size of 1-3mm changes, and the surface area of ​​the liquid phase is calculated to be 14.528cm ​​by scanning 2 , The liquid phase area on the surface of the cake-shaped sample of limonite powder with a particle size of +3mm is 12.672cm calculated by scanning 2; When the heating is continued to 1380℃, the liquid phase of the limonite powder samples with particle size of 1-3mm and +3mm are all covered with gaskets, and the heating is stopped;
[0074] Calculate the liquid flow index corresponding to the cake-shaped sample at different levels of temperature, which is calculated according to the following formula: Known:
[0075] Cake sample f of limonite powder with particle size of 1-3mm and +3mm 2 The bottom area is 3.228 cm 2 , The mass w of the two cake-shaped samples before heating is 4g, the liquid-phase beach area f of the cake-shaped sample of limonite powder with the particle size of 1-3mm at 1270℃ 1 =4.476cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid phase fluidity index A of the cake-like sample of limonite powder with a particle size of 1-3mm at 1270℃ is 0.312 cm 2 /g; the liquid-phase beach area f at 1310℃ for a cake-like sample of limonite powder with a particle size of 1-3mm 1 =14.528cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid fluidity index A of the cake-like sample of limonite powder with a particle size of 1-3mm at 1310℃ is 2.825 cm 2 /g;
[0076] Liquid-phase beach area f at 1270℃ for a cake-like sample of limonite powder with a particle size of +3mm 1 = 3.276 cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid phase fluidity index A of the cake-like sample of limonite powder with a particle size of +3mm at 1270℃ is 0.012 cm 2 /g; the liquid-phase beach area f at 1310℃ for a cake-like sample of limonite powder with a particle size of +3mm 1 = 12.672 cm 2 , Substituted into A=(f 1 -F 2 )/w, the liquid phase fluidity index A of the cake-like sample of limonite powder with a particle size of +3mm at 1310℃ is 2.361 cm 2 /g;
[0077] Make judgments:
[0078] Since the cake-like sample of limonite powder with a particle size of 1-3mm, the liquid phase fluidity index A at 1270℃ is 0.312cm 2 /g, indicating that its high temperature performance is poor at this temperature level; because the cake sample of limonite powder with a particle size of 1-3mm is at 1310℃, the liquid phase fluidity index A is 2.825 cm 2 /g, indicating that its high temperature performance is excellent at this temperature level;
[0079] The liquid phase fluidity index A of the cake-like sample of limonite powder with a particle size of +3mm at 1270℃ is 0.012 cm 2 /g, indicating that its high temperature performance is poor at this temperature level; the liquid phase fluidity index A of the cake sample of limonite powder with a particle size of +3mm at 1310℃ is 2.361 cm 2 /g, indicating that the high temperature performance is excellent at this temperature level.
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PUM

PropertyMeasurementUnit
Granularity<= 1.0mm
Bottom area3.228cm²
Granularity1.0 ~ 3.0mm
tensileMPa
Particle sizePa
strength10

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