Method and device for detecting sintering assimilation performance of iron ore
By using visualization technology and online real -time image data processing in iron ore sintering and homogeneous performance detection devices, use image collectors collection and processing data to solve the problem of low existing detection efficiency and high error, and realize iron ore sintering and assimilation and assimilation. Fast and accurate detection of performance.
Patent Information
- Application Number
- CN202411498276.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-01-28
AI Technical Summary
When analyzing the assimilation temperature, the existing iron ore sintering and assimilation performance detection device needs to gradually adjust the temperature gradient according to the sample calcination results, resulting in low detection efficiency, large errors, and cumbersome statistical analysis process.
The visualization technology and online real -time image data information processing technology are adopted, and the experimental picture data is collected through the end and the central image collector, and the picture data is processed to obtain the test results to achieve the rapid and accurate detection of iron ore sintering performance.
The experimental workload has been reduced, the accuracy of the detection and analysis has been improved, and the efficient, fast, and accurate of iron ore sintering homogeneous performance detection has reduced the cost of equipment energy consumption and test time.
Smart Images
Figure CN119375148A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of iron ore testing technology, in particular to an iron ore sintering assimilation performance testing method and a testing device. Background Art
[0002] Sintered ore is one of the important raw materials for blast furnace ironmaking. Sintering raw materials mainly include iron ore, flux, fuel and other iron-containing materials. Among them, iron ore is rich in variety and complex in source. Its physical and chemical properties have a great influence on the entire sintering process and product quality. In addition to properties such as particle size and chemical composition, the assimilation performance of iron ore is also an important sintering performance evaluation index. The sintering assimilation performance of iron ore refers to the ability of iron ore to interact with flux (such as limestone, dolomite, etc.) to form a liquid phase during the sintering process, and the ability to react with other mineral particles to form sintered ore after the liquid phase is generated. It is an important indicator to measure the reactivity and mineralization ability of iron ore during the sintering process, and directly affects the quality, strength and metallurgical properties of the sintered ore.
[0003] The evaluation of iron ore assimilation performance mainly includes assimilation temperature analysis, liquid phase fluidity analysis, sintered ore quality analysis, etc. The detection of assimilation temperature and liquid phase fluidity generally adopts a micro-sintering device. The micro-sintering device mainly consists of two parts, namely a high-temperature heating tubular furnace and a variable frequency speed regulation translation component. The function of the tubular furnace is to heat up the center of the corundum tube to the set temperature and form a temperature gradient from the center of the tube to the tube mouth. The variable frequency speed regulation translation component consists of a variable frequency motor and a transmission screw. The moving speed of the translation screw can be adjusted by frequency conversion. Combined with the change of the temperature field gradient in the tubular furnace, the temperature rise and fall and insulation control can be achieved. During the test, the prepared sample is placed on the corundum sample carrier, and the sample carrier is connected to the moving screw. The heating process is controlled by setting the moving rate. After reaching the set temperature, it is kept warm for a certain period of time, and then exits the tubular furnace at a set rate, that is, the temperature is lowered, and the sample changes are observed and the assimilation temperature is determined.
[0004] The existing sintered iron ore assimilation performance detection device needs to judge based on the sample roasting results when analyzing the assimilation temperature of the iron ore. If the assimilation characteristics do not appear, the test temperature needs to be gradually increased according to the temperature gradient until the sample shows the assimilation characteristics. The temperature at this time is the assimilation temperature. Otherwise, the temperature gradient needs to be reduced until the assimilation characteristics do not appear. The previous temperature is the assimilation temperature. In the existing scheme, it is necessary to set the appropriate temperature and temperature gradient based on experience. When the temperature gradient is too large, the assimilation temperature error is large. When the temperature gradient is too small, the number of tests increases, and the entire experimental process is complicated and inefficient. In addition, this method leads to large errors in the statistical analysis process, which has a great impact on the test results, resulting in unsatisfactory test results. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide a method and a device for detecting the sintering assimilation performance of iron ore, which can effectively improve the detection efficiency of the sintering assimilation performance of iron ore.
[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for detecting the sintering assimilation performance of iron ore, comprising the following steps: a. taking a portion of dry calcium oxide powder and placing it in a briquetting mold to be pressed into a calcium oxide cylinder, and taking a portion of dry iron ore powder and placing it in a briquetting mold to be pressed into a mineral powder cylinder; b. taking a corundum disc and placing it on one end of the top surface platform of a semi-cylindrical corundum sample carrier, then placing the calcium oxide cylinder on the corundum disc, and placing the mineral powder cylinder on the calcium oxide cylinder, with the axis of the mineral powder cylinder arranged in a vertical direction, and the axis of the mineral powder cylinder being aligned with the axis of the calcium oxide cylinder. The axes are coaxially arranged; c. The corundum sample carrier is pushed into the tubular furnace, and the mineral powder cylinder is set at the center of the channel in the tubular furnace; d. The heating program of the tubular furnace is set, and then heating is started, and then the water-cooling valve of the tubular furnace is opened in sequence, the light source at the sampling end of the tubular furnace is opened, the end image collector at the other end opposite to the sampling end of the tubular furnace is opened, and the middle image collector located above the mineral powder cylinder in the center of the tubular furnace is opened; e. The experimental image data obtained by the end image collector and the middle image collector in step d are collected, and the test result data is obtained by processing the image data.
[0007] Furthermore, in step a, the CaO content of the calcium oxide powder is ≥99.5%, and the iron ore powder is a concentrate with a particle size of <0.074 mm.
[0008] Furthermore, in step a, the inner diameter of the briquetting mold for pressing the calcium oxide column is 25 mm, the inner diameter of the briquetting mold for pressing the mineral powder column is 8 mm, the pressure of the briquetting mold is 30 KPa, and the briquetting time of the briquetting mold is 15 s.
[0009] Furthermore, in step b, the diameter of the corundum disc is 30 mm.
[0010] Furthermore, in step d, both the end image collector and the middle image collector are connected to the data collection end.
[0011] Furthermore, in step d, the light source is a short-wave blue light source with adjustable brightness.
[0012] The iron ore sintering assimilation performance detection device comprises a tubular furnace arranged in a horizontal direction, a light source is arranged at the sample feeding end of the tubular furnace, a corundum sample carrier is arranged in the tubular furnace, the corundum sample carrier is semi-cylindrical, the platform of the corundum sample carrier is upward and arranged in a horizontal direction, an end image collector is arranged at the other end opposite to the sample feeding end of the tubular furnace, a middle image collector is arranged on the top surface of the center position of the channel in the tubular furnace, a mineral powder cylinder to be detected in the tubular furnace is arranged at one end of the top surface platform of the corundum sample carrier, and the mineral powder cylinder is arranged directly below the middle image collector.
[0013] Furthermore, it comprises a water cooling plate, on which the end image collector is fixedly arranged, and the water cooling plate is fixedly arranged at the end of the tube furnace through a flange plate.
[0014] Furthermore, the water cooling disk includes a water inlet pipe and a water outlet pipe, and the cooling water of the water cooling disk enters the water cooling disk through the water inlet pipe and is discharged through the water outlet pipe.
[0015] Furthermore, the middle image collector includes a temperature sensor, which is in the shape of a long strip. The temperature sensor is arranged in a vertical direction, and the bottom of the temperature sensor is arranged in an area close to the mineral powder column.
[0016] The beneficial effects of the present invention are: integrating visualization technology and online real-time image data information processing technology into sintering equipment, replacing traditional observation methods with digital image information, and transforming the single and complicated iron ore sintering assimilation performance detection and analysis into continuous and synchronous detection and analysis, thereby reducing the experimental workload, improving the accuracy of detection and analysis, and having application and promotion value. Specifically, through the end image collector and the middle image collector, the experimental image data can be obtained quickly and conveniently, and then the test result data can be obtained by processing the above image data, thereby quickly and accurately obtaining the parameters of the iron ore sintering assimilation performance. The present invention is particularly suitable for the iron ore sintering assimilation performance detection method. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of an embodiment of the iron ore sintering assimilation performance detection device of the present invention.
[0018] Figure 2 It is a schematic diagram of the iron ore sintering assimilation performance detection device of the present invention when a ore powder cylinder is arranged inside.
[0019] Figure 3 This is a schematic diagram of the side direction of the mineral powder cylinder collected by the end image collector of the present invention at the beginning of sampling.
[0020] Figure 4 This is a schematic diagram of the vertical projection area S0 of the mineral powder cylinder collected by the middle image collector of the present invention at the beginning of sampling.
[0021] Figure 5 This is a schematic diagram of the side direction of the mineral powder cylinder collected by the end image collector of the present invention after the sampling time t.
[0022] Figure 6 The middle image collector of the present invention collects the vertical projection area S of the mineral powder cylinder after sampling time t. t Schematic diagram of .
[0023] The markings in the figure are: end image collector 1, water cooling plate 2, water inlet pipe 3, flange 4, water outlet pipe 5, tubular furnace 6, middle image collector 7, light source mobile bracket 8, light source 9, corundum sample carrier 10, corundum disc 11, calcium oxide cylinder 12, mineral powder cylinder 13, temperature sensor 14, vertical projection area S0 of mineral powder cylinder at the beginning of sampling, vertical projection area S of mineral powder cylinder after time t t . DETAILED DESCRIPTION
[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0025] like Figure 1 to Figure 2 The figure shows an embodiment of an iron ore sintering assimilation performance detection device. The iron ore sintering assimilation performance detection device includes a tubular furnace 6. The tubular furnace 6 is a tubular structure with a cavity inside for setting a mineral powder cylinder 13. Both ends of the tubular furnace 6 are connected to the outside world. Among them, one end of the tubular furnace 6 is a sampling end, and a light source 9 is provided at the sampling end. The light source 9 is arranged on a light source movable bracket 8, and then adjusted to obtain the best irradiation angle. A corundum sample carrier 10 is arranged in the tubular furnace 6. The corundum sample carrier 10 is semi-cylindrical. The platform of the corundum sample carrier 10 is arranged upward and in the horizontal direction. The other end opposite to the sampling end of the tubular furnace 6 is provided with an end image collector 1 for collecting images such as Figure 3 and Figure 5 The image shown is used for subsequent analysis. The central image collector 7 is arranged on the top surface of the central position of the channel in the tube furnace 6. The mineral powder cylinder 13 to be detected in the tube furnace 6 is arranged on one end of the top surface platform of the corundum sample carrier 10, and the mineral powder cylinder 13 is arranged directly below the central image collector 7. The central image collector 7 is used to collect Figure 4 and Figure 6 The temperature sensor 14 of the middle image collector 7 is in the shape of a long strip, and the temperature sensor 14 is arranged in the vertical direction, and the bottom of the temperature sensor 14 is arranged in the area close to the mineral powder column 13. The temperature sensor 14 detects the temperature of the area close to the mineral powder column 13, thereby providing data collection for the test temperature.
[0026] The end image collector 1 is fixedly mounted on a water cooling plate 2, and the water cooling plate 2 is fixedly mounted on the end of a tube furnace 6 via a flange 4. The cooling plate 2 includes a water inlet pipe 3 and a water outlet pipe 5. The cooling water of the water cooling plate 2 enters the water cooling plate 2 via the water inlet pipe 3 and is discharged via the water outlet pipe 5 to prevent the end image collector 1 from being damaged by high temperature.
[0027] The operation and test results of this solution are described below through examples.
[0028] Weigh 6g of dry chemically pure calcium oxide reagent, press it into a cylindrical calcium oxide cylinder 12 in a mold with an inner diameter of 25mm, the pressure is 30MPa, and the briquetting time is 15s. Weigh 1g of dry iron ore powder with a particle size of <0.074mm, press it into a cylindrical mineral powder cylinder 13 in a mold with an inner diameter of 8mm, the pressure is 30MPa, and the briquetting time is 15s. Take a corundum disc 11, place the calcium oxide cylinder 12 in the center of the corundum disc 11, and then place the mineral powder cylinder 13 in the center of the calcium oxide cylinder 12. Subsequently, place the entire sample consisting of the mineral powder cylinder 13, the calcium oxide cylinder 12 and the corundum disc 11 on the top plane of the right end of the corundum sample carrier 10, and then gently push the corundum sample carrier 10 into the interior of the tubular furnace through the sample inlet end of the tubular furnace to ensure that the mineral powder cylinder 13 is located directly below the middle image collector 7. Subsequently, the light source 9 is turned on, the water inlet pipe 3 and the water outlet pipe 5 are turned on, and the central image collector 7 in the vertical direction of the center of the tube furnace is turned on. In the image acquisition software connected to the central image collector 7, the position of the mineral powder cylinder 13 is observed and the position of the corundum sample carrier 10 is finely adjusted to ensure that the mineral powder cylinder 13 is located in the center of the image collected by the central image collector 7. At the same time, in order to ensure the accuracy of the test, it is ensured that the calcium oxide cylinder 12 and the mineral powder cylinder 13 are in the shape of concentric circles in the vertical direction, that is, Figure 4 and Figure 6 The end image collector 1 at the other end of the tube furnace 6 is opened to collect the side image of the mineral powder cylinder 13, as shown in FIG. Figure 3 and Figure 5 The heating program of the tubular furnace 6 is set from room temperature to 800°C, the heating rate is 7°C / min, the temperature is kept for 10 minutes, and then from 800°C to 1350°C, the heating rate is 5°C / min. When the preset maximum temperature is reached, the heating stops and the test ends.
[0029] Among the collected images, the middle image collector 7 collects the following Figure 4 and Figure 6 Image shown. Figure 4 The vertical projection area S0 of the mineral powder cylinder at the beginning of sampling refers to the area of the mineral powder cylinder 13 obtained by looking down and photographing it through the middle image collector 7. Figure 6 After time t, the vertical projection area S of the mineral powder cylinder t, refers to the projected area of the mineral powder cylinder 13 that has undergone a shape change after a period of time t (generally S t Greater than S0). The image acquisition sets the sampling interval to 2s, the acquisition start temperature to 1150℃, and the acquisition end temperature to 1350℃. The acquired image is first preprocessed, including binarization, threshold segmentation, smoothing, and enhancement. The contour edge feature extraction is then performed on the preprocessed image, and the contour information is converted into area information to obtain the vertical projection area of the iron ore powder cylinder. At the beginning of sampling, the vertical projection area of the iron ore powder cylinder is S0, the sampling time t, the vertical projection area of the iron ore powder cylinder is St, and the liquid phase fluidity L = (S t -S0) / S t , convert the image information into numerical data, and draw the curve of the change of the liquid phase fluidity of iron ore with the test temperature in real time. The temperature when the liquid phase fluidity L changes significantly is the assimilation temperature. At the same time, combined with the image collected by the end image collector 1, such as Figure 3 and Figure 5 As shown, changes in the assimilation behavior of the contact interface between the mineral powder cylinder 13 and the calcium oxide cylinder 12 can be observed.
[0030] Through the above test steps, it can be seen that this scheme improves the efficiency of iron ore assimilation performance detection and analysis, can also improve the characterization accuracy of liquid phase fluidity, can also reduce the test time cost and equipment energy consumption, and realize intelligent detection and analysis. Through visual real-time control of the experimental process, the post-processing of experimental data is simple and fast, and the detection time can be greatly shortened to reduce equipment energy consumption, and the detection method is more accurate and has smaller errors.
Claims
1. A method for detecting the sintering assimilation performance of iron ore, characterized in that: The steps include: a. Take a portion of dry calcium oxide powder and place it in a briquetting mold to press it into a calcium oxide cylinder (12); take a portion of dry iron ore powder and place it in a briquetting mold to press it into an iron ore powder cylinder (13); b. Take a corundum disc (11) and place it on one end of the top surface platform of a semi-cylindrical corundum sample carrier (10), then place a calcium oxide cylinder (12) on the corundum disc (11), and place a mineral powder cylinder (13) on the calcium oxide cylinder (12), with the axis of the mineral powder cylinder (13) arranged in the vertical direction, and the axis of the mineral powder cylinder (13) and the axis of the calcium oxide cylinder (12) being arranged coaxially; c. Push the corundum sample carrier (10) into the tubular furnace, and set the mineral powder cylinder (13) at the center of the channel in the tubular furnace; d. Set the temperature rising program of the tube furnace (6), then start heating, then open the water cooling valve of the tube furnace (6) in sequence, turn on the light source (9) at the sample feeding end of the tube furnace (6), turn on the end image collector (1) at the other end opposite to the sample feeding end of the tube furnace (6), and turn on the middle image collector (7) at the center of the tube furnace (6) located above the mineral powder cylinder (13); e. In the acquisition step d, the end image collector (1) and the middle image collector (7) obtain the experimental image data, and obtain the test result data by processing the image data.
2. The method for detecting the sintering assimilation performance of iron ore according to claim 1, characterized in that: In step a, the CaO content of the calcium oxide powder is ≥99.5%, and the iron ore powder is a concentrate with a particle size of <0.074 mm.
3. The method for detecting the sintering assimilation performance of iron ore according to claim 1, characterized in that: In step a, the inner diameter of the briquetting mold for pressing the calcium oxide column (12) is 25 mm, the inner diameter of the briquetting mold for pressing the mineral powder column (13) is 8 mm, the pressure of the briquetting mold is 30 KPa, and the briquetting time of the briquetting mold is 15 s.
4. The iron ore sintering assimilation performance detection method according to claim 1, characterized in that: In step b, the diameter of the corundum disc (11) is 30 mm.
5. The method for detecting the sintering assimilation performance of iron ore according to any one of claims 1 to 4, characterized in that: In step d, the end image collector (1) and the middle image collector (7) are both connected to the data collection terminal.
6. The method for detecting the sintering assimilation performance of iron ore according to any one of claims 1 to 4, characterized in that: In step d, the light source (9) is a short-wave blue light source with adjustable brightness.
7. An iron ore sintering assimilation performance detection device, comprising a tubular furnace (6) arranged in a horizontal direction, a light source (9) being arranged at a sample inlet end of the tubular furnace (6), a corundum sample carrier (10) being arranged in the tubular furnace (6), the corundum sample carrier (10) being semi-cylindrical, the platform of the corundum sample carrier (10) being arranged upward and in a horizontal direction, characterized in that: An end image collector (1) is arranged at the other end of the tubular furnace (6) opposite to the sample feeding end, a middle image collector (7) is arranged on the top surface at the center position of the channel in the tubular furnace (6), a mineral powder cylinder (13) to be detected in the tubular furnace (6) is arranged at one end of the top surface platform of the corundum sample carrier (10), and the mineral powder cylinder (13) is arranged directly below the middle image collector (7).
8. The iron ore sintering assimilation performance detection device according to claim 7, characterized in that: It comprises a water cooling plate (2), an end image collector (1) is fixedly arranged on the water cooling plate (2), and the water cooling plate (2) is fixedly arranged on the end of a tubular furnace (6) via a flange plate (4).
9. The iron ore sintering assimilation performance detection device according to claim 8, characterized in that: The water cooling disk (2) comprises a water inlet pipe (3) and a water outlet pipe (5); cooling water of the water cooling disk (2) enters the water cooling disk (2) through the water inlet pipe (3) and is discharged through the water outlet pipe (5).
10. The iron ore sintering assimilation performance detection device according to claim 7, characterized in that: The middle image collector (7) comprises a temperature sensor (14), which is in the shape of a long strip. The temperature sensor (14) is arranged in a vertical direction, and the bottom of the temperature sensor (14) is arranged in an area close to the mineral powder column (13).