Method for detecting high temperature performance of iron ore powder

[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.

[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.

[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.