CN108020578B - Detection equipment for assimilation temperature of iron ore powder and assembly and detection method thereof - Google Patents
Detection equipment for assimilation temperature of iron ore powder and assembly and detection method thereof Download PDFInfo
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Abstract
The invention discloses equipment and a method for detecting assimilation temperature of iron ore powder, and belongs to the field of detection of sintering characteristics of iron ore powder. The method comprises the steps of pressing a calcium oxide tablet, and installing a first electrode and a second electrode on the calcium oxide tablet; the method comprises the steps that a calcium oxide pressing sheet is arranged in a heating unit, a first electrode and a second electrode are electrically connected to form an electric signal detection component, the heating unit is provided with a temperature detection component, and the temperature detection component and the electric signal detection component form a detection unit; the heating unit is internally provided with a gas spray head, and the gas supply cylinder is connected with the gas spray head in the heating unit through a gas supply pipeline to form the detection equipment for assimilation temperature of the iron ore powder. The gas supply unit blows gas into the detection area, so that the iron ore powder is subjected to detection of assimilation temperature of the iron ore powder under stable atmosphere, and the assimilation temperature of the iron ore powder is detected through the change of electric signals in the heating process, so that the influence of different reaction atmospheres on the assimilation temperature can be simulated.
Description
Technical Field
The invention relates to the field of iron ore powder sintering characteristic detection, in particular to iron ore powder assimilation temperature detection equipment and an assembling and detecting method thereof.
Background
The assimilation property (expressed by assimilation temperature) of the iron ore powder is one of the basic characteristics of iron ore powder sintering, and reflects the reaction capability of the iron ore powder and CaO, and the assimilation property is characterized by the difficulty of the iron ore powder in generating a liquid phase in the sintering process. It is known from thermodynamic theory that if the assimilation temperature of iron ore powder is lower, it is more likely to react to form a liquid phase upon sintering, but for heterogeneous sintered ore, it is not desirable that coarse ore as core ore is excessively melted based on consideration of consolidation of the sintered ore and ventilation of the sintered material layer, so as to avoid reduction of core ore functioning as a consolidated skeleton and deterioration of ventilation of the sintered material layer, which affects quality and yield of sintered ore. Therefore, in the process of optimizing ore blending, it is hopeful to match the iron ore powder with good assimilation with the iron ore powder with poor assimilation, and the assimilation of the mixed ore is in a proper range by combining the fuel ratio in the sintering process, so that the production quality of the sintered ore is improved. However, there is no special detection equipment for detecting the assimilation temperature of iron ore powder, and it is highly desirable to develop a device specially used for detecting the assimilation temperature of iron ore powder.
At present, for the measurement of the minimum assimilation temperature of iron ore powder, an assimilation detection method is proposed in the literature (experimental study of assimilation ability of iron ore powder and CaO) (Wu Shengli, liu Yu, du Jianxin, et al, university of Beijing science and technology, 2002, 24 (3): 258-261): the method for judging the assimilation characteristics of the iron ore powder is characterized in that a compound slightly larger than the circle of the iron ore powder on the contact surface of the iron ore powder small cake and the CaO small cake is taken as the assimilation characteristic, the temperature for achieving the assimilation characteristic is the lowest assimilation temperature of the iron ore powder, and the assimilation characteristics of the iron ore powder are evaluated according to the temperature. The experiment method can judge the lowest assimilation temperature by trying different temperature tests, and the corresponding experiment method can not accurately judge the lowest assimilation temperature of the iron ore powder due to obvious thermal hysteresis phenomenon because the temperature is raised too fast, so that the assimilation phenomenon is easy to take. The experimental process is time-consuming and labor-consuming, the artificial operation factors have unavoidable influence on the experimental result, and the minimum assimilation temperature is judged by naked eyes, so that the accuracy is poor, and the artificial subjectivity in the detection process is strong.
The search, patent literature: a method for measuring the assimilation reaction performance of iron ore powder and CaO (CN2015110829051. X), a method for measuring the assimilation characteristic of iron ore powder (CN 201410603085.2), a device for measuring the high-temperature metallurgical performance of visual iron ore powder (CN 201210385867.4) and the like, the technical proposal is that the lowest assimilation temperature of iron ore powder and CaO is determined by observing the mutation condition of a sample in an experimental furnace through a camera device; however, the individual subjectivity of determining the assimilation temperature by observation is too large, so that the detection error of the assimilation temperature is large, but the influence of the reaction atmosphere on the assimilation temperature is not focused.
Furthermore, the method for measuring the minimum assimilation temperature of iron ore powder proposed in the literature "search for a novel method for measuring assimilation properties of iron ore powder" (Wu Keng, wang Meng, zhao Yong, et al, university of northeast university report, 2013, 34 (7): 961-965) is as follows: pressing the fine iron ore powder and the analytically pure CaO reagent into cakes, placing the iron ore powder cake samples and the CaO cake samples on a high-temperature furnace for carrying out remembering roasting, and simultaneously carrying out shooting, time recording and temperature recording in the heating roasting process; determining the starting time and the temperature of the assimilation reaction by using the XRD pattern; although the determination method is combined with the XRD technology to assist in judging the minimum assimilation temperature of the iron ore powder, the initial assimilation state of the iron ore powder and CaO still requires that a person contrast the XRD pattern by naked eyes, and the result has errors; there is also no concern about the effect of the reaction atmosphere on the assimilation temperature.
Through the analysis, although the lowest assimilation temperature of the iron ore powder can be detected to a certain extent in the prior art, the detection methods all need to depend on experimenters to judge when assimilation reaction occurs through observation, and the influence of artificial subjective factors is large; moreover, the influence of different atmospheres on assimilation temperature cannot be simulated, so that the detection result of the assimilation temperature of the iron ore powder is inaccurate, and the actual production process is difficult to characterize.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that in the prior art, the influence of artificial subjective factors on the assimilation temperature detection of iron ore powder is large and different reaction atmospheres cannot be simulated, and provides the detection equipment and the assembly and detection method for the assimilation temperature of the iron ore powder.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
according to the method for assembling the iron ore powder assimilation temperature detection equipment, the calcium oxide tablets are pressed, and the first electrode and the second electrode are arranged on the calcium oxide tablets; the method comprises the steps that a calcium oxide pressing sheet is arranged in a heating unit, a first electrode and a second electrode are electrically connected to form an electric signal detection component, the heating unit is provided with a temperature detection component, and the temperature detection component and the electric signal detection component form a detection unit; the gas nozzle is arranged in the heating unit, and the gas supply cylinder is connected with the gas nozzle in the heating unit through a gas supply pipeline to form the detection equipment for assimilation temperature of the iron ore powder.
Preferably, the specific steps are as follows:
A. pressing a calcium oxide pressing sheet in a die, forming electrode holes in the calcium oxide pressing sheet, placing a first electrode in the electrode holes formed in the calcium oxide pressing sheet, completely covering the first electrode under the calcium oxide, and placing a second electrode on the calcium oxide pressing sheet;
B. setting a calcium oxide pressing sheet in the heating unit, connecting the first electrode and the second electrode with the detection device to form an electric signal detection component, and installing a temperature detection component on the calcium oxide pressing sheet, wherein the temperature detection component and the electric signal detection component form a detection unit;
C. the gas spray head is arranged at the lower part of the calcium oxide tablet of the heating unit, and the gas supply cylinder is connected with the gas spray head in the heating unit through a gas supply pipeline.
The invention relates to a detection device for assimilation temperature of iron ore powder, which comprises a heating unit, a detection device and a detection device, wherein the heating unit is used for heating an iron ore powder sample; and a detection unit including a temperature detection part for detecting the temperature of the iron ore powder sample and an electric signal detection part; the electric signal detection component is used for detecting the change condition of the electric signal of the iron ore powder sample in the heating process; and the air supply unit is used for supplying air into the heating unit from an air supply air bottle of the air supply unit and adjusting the reaction atmosphere of the assimilation reaction.
Preferably, a calcium oxide tablet is arranged in the heating unit and used for bearing the iron ore powder sample, and a gas nozzle of the gas supply unit is arranged below the calcium oxide tablet; the temperature detection component is arranged above the calcium oxide tabletting.
Preferably, the electric signal detection means includes a first electrode, a second electrode, and a detection device; the detection device is electrically connected with the first electrode and the second electrode; and the first electrode and the second electrode are kept in a non-contact state, and at least one of the first electrode or the second electrode is arranged in the calcium oxide tablet.
Preferably, the calcium oxide tablet is provided with at least one electrode hole for accommodating the first electrode or the second electrode.
Preferably, the calcium oxide tablet is provided with an electrode hole for accommodating the first electrode, and the second electrode is arranged on the upper surface of the tablet of the calcium oxide tablet.
Preferably, the first electrode and the second electrode are arranged in parallel, the horizontal distance between the first electrode and the second electrode is d, d is less than or equal to R/2, and R is the diameter of a stacking surface of the iron ore powder sample on the calcium oxide tablet.
Preferably, the air supply unit comprises an air supply cylinder, a flowmeter and a gas spray head, wherein the gas spray head is arranged in the middle of the heating unit, the air supply cylinder is connected with the gas spray head in the heating unit through an air supply pipeline, and the flowmeter is arranged on the air supply pipeline.
The invention relates to a method for detecting assimilation temperature of iron ore powder by simulating different atmospheres, which adopts the equipment for detecting assimilation temperature of iron ore powder, an air supply cylinder of an air supply unit supplies air into a heating unit, regulates the reaction atmosphere of assimilation reaction, detects the electric signal change condition of an iron ore powder sample in the heating process, and judges the assimilation temperature of the iron ore powder by the electric signal change of the iron ore powder sample.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The invention relates to equipment for detecting assimilation temperature of iron ore powder and an assembly method thereof, which comprises a heating unit, a detecting unit and a gas supply unit, wherein an iron ore powder sample is heated and warmed up in the heating unit, a temperature detecting component is used for detecting the temperature of the iron ore powder sample, an electric signal detecting component is used for detecting the change condition of an electric signal of the iron ore powder sample in the warming up process, the assimilation temperature of the iron ore powder is detected through the electric signal change in the warming up process, the influence of different reaction atmospheres on the assimilation temperature can be simulated, the accuracy of assimilation temperature detection is improved, the assimilation temperature detection under the atmosphere without oxygen content is realized, and a good technical idea is provided for exploring the influence of smoke circulation and oxygen-enriched sintering on the quality of sintered ore;
(2) According to the iron ore powder assimilation temperature detection equipment and the iron ore powder assimilation temperature detection method, the first electrode and the second electrode are arranged, the electric signal change condition of an iron ore powder sample is detected in the heating process, when assimilation reaction is carried out on the iron ore powder sample and calcium oxide tabletting to form a liquid phase, a circuit is instantaneously conducted, the time of the assimilation reaction of the iron ore powder sample is judged, and the assimilation reaction temperature of the iron ore powder sample is found according to the time of the assimilation reaction of the iron ore powder sample, so that the assimilation temperature of the iron ore powder is accurately and objectively detected;
(3) According to the iron ore powder assimilation temperature detection equipment and the assembly method thereof, at least one of the first electrode or the second electrode is arranged in the calcium oxide tablet, so that the time of an iron ore powder assimilation reaction can be judged according to the numerical mutation of the resistance value, the assimilation temperature of the iron ore powder is further judged, and the detection accuracy is improved;
(4) According to the method for simulating the assimilation temperature of the iron ore powder by using different atmospheres, the gas supply cylinder of the gas supply unit supplies gas into the heating unit, the reaction atmosphere of assimilation reaction is regulated, the electric signal change condition of the iron ore powder sample is detected in the heating process, the assimilation temperature of the iron ore powder is judged through the electric signal change of the iron ore powder sample, and compared with the method for judging the assimilation temperature of the iron ore powder by observing the deformation such as wetting angle and the like between the iron ore powder sample and the CaO tablet through naked eyes or an image analysis system, the accuracy of judging the time of the assimilation reaction of the iron ore powder is improved, and reliable data of the sintering performance of the iron ore powder can be provided for sintering production.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a device for detecting assimilation temperature of iron ore powder according to the present invention;
FIG. 2 is a schematic diagram of the mating structure of the calcium oxide tablet and electrode of the present invention;
FIG. 3 is a schematic view of the structure of the first electrode of the present invention incorporating a calcium oxide pellet;
fig. 4 is a top view of the calcium oxide tablet of example 2;
FIG. 5 is a graph of temperature versus electrical signal for example 1;
FIG. 6 is a graph of temperature versus electrical signal for comparative example 1;
FIG. 7 is a schematic diagram of the structure of the detection unit and the calcium oxide tablet according to example 3;
fig. 8 is a schematic structural diagram of the detection unit and the calcium oxide tablet according to example 4.
Reference numerals in the schematic drawings illustrate:
100. a heating unit; 110. a support table; 120. heating a furnace body; 130. tabletting calcium oxide; 131. an electrode hole; 132. the upper surface of the tablet is pressed;
200. a detection unit; 210. a temperature detecting part; 211. a temperature measuring end; 220. an electric signal detection section; 221. a first electrode; 222. a second electrode; 223. a detection device;
300. a control processing unit;
400. iron ore powder sample;
500. an air supply unit; 510. a gas supply cylinder; 511. a gas cylinder flow valve; 520. a flow meter; 530. an air supply duct; 540. a gas mixing chamber; 550. a gas shower.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the invention may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
The following detailed description and example embodiments of the invention may be better understood when read in conjunction with the accompanying drawings, in which elements and features of the invention are identified by reference numerals.
Example 1
Referring to fig. 1, 2 and 3, the apparatus for detecting assimilation temperature of iron ore powder according to the present invention comprises a heating unit 100 and a detecting unit 200, wherein the heating unit 100 is used for heating an iron ore powder sample 400, the heating unit 100 comprises a heating furnace body 120, and the heating furnace body 120 is an electric heating furnace or a microwave heating furnace, or may be a fuel heating furnace.
A supporting table 110 is arranged in the heating furnace body 120, and the supporting table 110 is used for bearing a calcium oxide tablet 130. The heating unit 100 is provided therein with a calcium oxide tablet 130, and the calcium oxide tablet 130 is used for carrying the iron ore powder sample 400. The support base 110 is located at the center of the heating furnace body 120. The heating unit 100 and the detecting unit 200 are electrically connected with the control processing unit 300, the control processing unit 300 is used for controlling the temperature rising system of the heating unit 100, and the control processing unit 300 can collect the electrical signals and the temperature signals detected by the detecting unit 200.
The detecting unit 200 of the present embodiment includes a temperature detecting part 210 and an electrical signal detecting part 220, the temperature detecting part 210 is used for detecting the temperature of the iron ore powder sample 400, and the temperature detecting part 210 may be a thermocouple or an infrared temperature measuring device, or other devices or instruments having a temperature measuring function. In this embodiment, the temperature measuring end 211 of the temperature detecting component 210 is disposed directly below the calcium oxide tablet 130, and the temperature measuring end 211 can effectively and rapidly detect the temperature of the iron ore powder sample 400 when assimilation reaction occurs, thereby improving the accuracy of detection.
The electric signal detecting part 220 is used for detecting the change condition of the electric signal of the iron ore powder sample 400 during the temperature rising process. The resistance signal detected in this example is the iron ore powder sample 400, and may also be referred to as the resistance value of the iron ore powder sample 400. The electrical signal of the present embodiment may be a conductive signal, a voltage signal, or a current signal.
The electric signal detecting section 220 includes a first electrode 221, a second electrode 222, and a detecting device 223; the detection device 223 is electrically connected to the first electrode 221 and the second electrode 222; and the first electrode 221 and the second electrode 222 are maintained in a non-contact state, that is, the iron ore powder sample 400 is connected in series between the first electrode 221 and the second electrode 222 during the detection. The materials of the first electrode 221 and the second electrode 222 are high temperature resistant and inert platinum rhodium wires, so that the platinum rhodium wires are not melted at high temperature and do not react with gas.
It should be noted that at least one of the first electrode 221 or the second electrode 222 is disposed in the calcium oxide sheet 130, the first electrode 221 of the present embodiment is disposed in the calcium oxide sheet 130, and the second electrode 222 is disposed in the iron ore powder sample 400. That is, at least one of the first electrode 221 or the second electrode 222 is not directly contacted with the iron ore powder sample 400, thereby improving the accuracy of experimental detection.
The calcium oxide tablet 130 of the present embodiment is provided with at least one electrode hole 131, and the electrode hole 131 is used for accommodating the first electrode 221 or the second electrode 222. The calcium oxide tablet 130 of the present embodiment is provided with an electrode hole 131, the electrode hole 131 is used for accommodating the first electrode 221, the second electrode 222 is placed on the tablet upper surface 132 of the calcium oxide tablet 130, and the iron ore powder sample 400 is covered on the upper portion of the second electrode 222. It is worth noting that the method for judging the assimilation temperature of the iron ore powder through morphological observation is omitted, so that the step of preparing a sample by using the iron ore powder briquetting is omitted, and the accuracy of detecting the assimilation temperature of the iron ore powder is further improved.
As shown in fig. 1, the gas supply cylinder 510 of the gas supply unit 500 of the present embodiment supplies gas into the heating unit 100, the gas supply unit 500 is used for adjusting the reaction atmosphere of the assimilation reaction, and the gas spray head 550 of the gas supply unit 500 is disposed below the calcium oxide tablets 130; the temperature detecting part 210 is disposed above the calcium oxide tablet 130 so as to avoid the influence of the flow or fluctuation of the gas on the detection data of the temperature detecting part 210. The method comprises the following steps of: the air supply unit 500 includes an air supply cylinder 510, a flow meter 520 and a gas spray head 550, the gas spray head 550 is disposed in the middle of the heating unit 100, the air supply cylinder 510 is connected with the gas spray head 550 in the heating unit 100 through an air supply pipe 530, and the flow meter 520 is disposed on the air supply pipe 530. The gas supply cylinder 510 is provided with a gas cylinder flow valve 511, the gas cylinder flow valve 511 is used for adjusting the gas flow of the gas supply cylinder 510, and the partial pressure of oxygen in the gas can be adjusted by adjusting the gas flow of different gas cylinders, so that different reaction atmospheres can be adjusted; the flowmeter 520 is disposed on the gas supply pipe 530, and the flowmeter 520 is used for adjusting the flow rate of the gas blown by the gas supply unit 500.
The number of the gas shower heads 550 of the present embodiment is at least 2, and the present embodiment is provided with 4 gas shower heads 550, thereby improving the uniformity of the atmosphere distribution. Thereby realizing the supply of air from the air supply unit 500 into the heating unit 100, the air supply unit 500 being used to adjust the reaction atmosphere of the assimilation reaction. The embodiment is provided with two air supply cylinders 510, each of which is provided with N 2 And O 2 The flow of the cylinder flow valve 511 is adjusted so that O in the gas supply line 530 2 10%, N 2 The content is 90%, so that the sintering process can be better simulated. The method realizes assimilation temperature detection under the atmosphere without oxygen content, and provides a good technical idea for exploring the influence of smoke circulation and oxygen-enriched sintering on the quality of the sinter.
As shown in fig. 3, the thickness of the top of the electrode hole 131 from the upper surface of the calcium oxide sheet 130 is δ, which can be calculated by the following formula:
delta is the thickness of the diffusion layer, mm; k is the reaction coefficient, kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the D is diffusion coefficient, m 2 S; ρ is the density of the diffusion substance, kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Lambda is the diffusion time, s.
k is generally 1.0-1.8, and the value is 1.0;
d has a value of 3.0X10 -7 -5.0×10 -6 The value of this example is 5×10 -7 ；
ρ, density of iron ore powder, generally 4.5-4.9X10 3 kg/m 3 The density of the iron ore powder in the example is 4.61 multiplied by 10 3 kg/m 3 ；
Regarding lambda, the temperature of the solid phase reaction of the iron ore powder and CaO is about 600 ℃, and considering slow diffusion under the low temperature condition, the time is counted after 600 ℃ is selected in the embodiment, and the actual effective diffusion time is usually 300-360s according to different assimilation temperatures of the iron ore powder, and 305s is taken in the embodiment.
The method for detecting the assimilation reaction time of the iron ore powder by adopting the electric signal in the embodiment adopts the device for detecting the assimilation temperature of the iron ore powder, and places the iron ore powder sample 400 in the heating unit 100, and detects the assimilation reaction time of the iron ore powder by the electric signal mutation of the iron ore powder sample 400 in the heating process. The method comprises the following specific steps:
step one, equipment assembly
The method for assembling the iron ore powder assimilation temperature detection device of the present embodiment presses the calcium oxide tablet 130, and installs the first electrode 221 and the second electrode 222 on the calcium oxide tablet 130; the calcium oxide tablet 130 is arranged in the heating unit 100, and then the first electrode 221 and the second electrode 222 are electrically connected to form an electric signal detection component 220, the heating unit 100 is provided with a temperature detection component 210, and the temperature detection component 210 and the electric signal detection component 220 form a detection unit 200; the gas nozzle 550 is installed in the heating unit 100, and the gas cylinder 510 is connected with the gas nozzle 550 in the heating unit 100 through the gas supply pipeline 530, and the detection device for assimilation temperature of the iron ore powder is assembled. The specific description is as follows:
A. 2g of CaO powder having a purity of 98.0% was weighed by a balance and pressed into one by a pressure of 20MPa in a die
A first electrode 221 with the diameter of 0.8mm is placed in a groove of the calcium oxide pressing sheet 130, calcium oxide powder is uniformly added into the groove, the first electrode 221 is completely covered on the lower part of the calcium oxide powder, the calcium oxide powder is lightly pressed and smoothed to form an electrode hole 131, the first electrode 221 is arranged in the electrode hole 131, a second electrode 222 is placed on the calcium oxide pressing sheet 130, and the first electrode 221 and the second electrode 222 are in a line from the overlooking angle in the embodiment, so that the two electrodes are in an open circuit state;
B. the calcium oxide tablet 130 is arranged in the heating unit 100, the calcium oxide tablet 130 is arranged in the central part of the heating unit 100, the first electrode 221 and the second electrode 222 are electrically connected with the detection device 223 to form an electric signal detection component 220, and the detection device 223 is used for detecting and collecting electric signals of the iron ore powder sample 400; a temperature detection part 210 is arranged on the upper part of the calcium oxide tablet 130, and the temperature detection part 210 and the electric signal detection part 220 form a detection unit 200;
C. the gas spray head 550 is installed at the lower portion of the calcium oxide tablet 130 of the heating unit 100, and the gas supply cylinder 510 is connected to the gas mixing chamber 540, and the gas mixing chamber 540 is connected to the gas spray head 550 in the heating unit 100 through the gas supply pipe 530.
Step two, sample preparation
A. The iron ore powder of the embodiment is MAC powder, iron ore powder to be detected is ground into fine powder with granularity less than 0.147 mu m, wherein the passing rate of 200 meshes is 80%, and the iron ore powder is dried for 4 hours at 105 ℃ for standby; it should be noted that the iron ore powder does not need to be pressed, and only needs to be coated on the surface of the calcium oxide tablet 130, so that the iron ore powder sample 400 can more simulate the actual production process in the detection process; in order to observe the wetting angle between the iron ore powder sample 400 and the calcium oxide tablet 130 through naked eyes or an image analysis system in the prior art, the sample with a regular shape must be prepared by pressurizing, and the iron ore powder is not pressurized in the sintering process, so that the actual production process is difficult to effectively simulate by the existing method, the technical prejudice of the prior art is broken, and the accuracy of assimilation temperature detection is improved.
B. Covering the calcium oxide tablet 130 with the iron ore powder sample 400 powder and sufficiently contacting the calcium oxide tablet 130 such that the iron ore powder sample 400 is connected in series between the first electrode 221 and the second electrode 222;
step three, detecting the temperature of assimilation reaction
With the above-described apparatus for detecting the assimilation temperature of iron ore powder, the gas supply cylinder 510 of the gas supply unit 500 supplies gas into the heating unit 100, adjusts the reaction atmosphere of the assimilation reaction, continuously blows gas into the detection area during the detection process, and the blown gas is used to simulate the reaction atmosphere of the assimilation reaction of iron ore powder, and detects the change in the electrical signal of the iron ore powder sample 400 during the temperature increase, and judges the assimilation temperature of iron ore powder from the change in the electrical signal of the iron ore powder sample 400. The heating unit 100 of this embodiment heats according to a set heating curve, and specifically includes the following steps:
the temperature is increased to 2.5 ℃/s at the room temperature to 600 ℃;
600-1000 ℃, and the temperature rising speed is 3.3 ℃/s;
1000-1150 deg.c and with temperature raising rate of 1.7 deg.c/s;
1150-1280 ℃ and the heating rate is 1.1 ℃/s;
when the temperature detecting unit 210 detects the temperature rise to 1200 ℃, the change of the electric signal with time and the temperature with time are recorded from 1200 DEG CThe time change, the correspondence between the electrical signal and the temperature is obtained by the time medium, and the temperature-electrical signal curve of the iron ore powder sample 400 is plotted as shown in fig. 5. Determining the temperature value of the corresponding coordinate axis according to the electric signal mutation of the electric signal and the temperature curve, determining the corresponding assimilation temperature as T=1228deg.C, and detecting to obtain the assimilation temperature of the iron ore powder. The abrupt change of the electric signal and the temperature curve means that the electric signal changes obviously along with the change of the temperature, and obvious inflection points are formed on the image, so that the method is more visual and accurate. Wherein, the abrupt change of the resistance value means that the resistance value changes by orders of magnitude within 1 to 5 seconds, namely, the orders of magnitude change means that: phi-shaped Chinese character n /￠ m >100, phi n Refers to the resistance value at n deg.C, unit omega; phi-shaped Chinese character m The resistance value is shown as the unit omega when the temperature is m DEG C, and m-n is more than or equal to 1 ℃.
In this example, n=1227deg.C and phi n =57000Ω; m=1228deg.C and phi n ＝124Ω；￠ n /￠ m >100, at this time, the temperature at which the assimilation reaction started was 1228 ℃.
The assimilation temperature detected by the method is 1230 ℃ by adopting the test study of assimilation ability of iron ore powder and CaO (Wu Shengli). Compared with the conventional detection method, the method improves the accuracy of assimilation temperature detection.
Comparative example 1
The basic content of this embodiment is the same as embodiment 1, in that: in the embodiment, the assimilation temperature is detected under the conventional atmosphere condition, namely, the assimilation temperature is detected under the condition of nitrogen protection, and the experimental result obtained by detection draws a temperature-electric signal curve as shown in fig. 6; and determining the temperature value of the corresponding coordinate axis according to the electric signal mutation of the electric signal and the temperature curve, determining the corresponding assimilation temperature as T=1226deg.C, and detecting to obtain the assimilation temperature of the iron ore powder.
The assimilation temperature was different for the same iron ore powder with respect to example 1 and comparative example 1 under different given atmosphere conditions, so that the effect of the reaction atmosphere on the assimilation temperature was taken into consideration, thereby making the detection of assimilation performance more advantageous for characterizing the actual performance of the iron ore powder.
In addition, if the first electrode 221 or the second electrode 222 is disposed in the iron ore powder sample 400, the resistance of the iron ore powder sample 400 detected during the heating process is continuously reduced, and the resistance value is almost unchanged after the liquid phase appears without abrupt change of the resistance value before and after the iron ore powder and calcium oxide undergo an assimilation reaction to form a calcium ferrite liquid phase, so that the fluctuation is small; it is difficult to judge the timing of occurrence of assimilation of the iron ore powder by detecting the resistance mutation of the iron ore powder sample 400, and further judge the assimilation temperature of the iron ore powder. The reasons for this may be: as the temperature increases to exacerbate molecular movement, the iron ore fines begin to develop a conductivity signal. When the temperature is raised to 1200 ℃ or higher, the resistance value is gradually reduced to about 200 ohms when the position of the first electrode 221 or the second electrode 222 is not changed; with further increase of the temperature, the resistance value of the iron ore powder sample 400 obtained by detection is continuously reduced, the whole reduction process is uniform, and the time of the iron ore powder assimilation reaction and the assimilation temperature of the iron ore powder are difficult to judge only by measuring the resistance change before and after the assimilation reaction of the contact surface of the iron ore powder sample 400 and the calcium oxide tablet 130 is formed.
The invention detects the electric signal change condition of the iron ore powder sample 400 in the heating process by arranging the first electrode 221 and the second electrode 222, and instantly conducts the circuit when the iron ore powder sample 400 and the calcium oxide tablet 130 are subjected to assimilation reaction and form liquid phase, judges the time of assimilation reaction of the iron ore powder sample 400, and searches the assimilation reaction temperature of the iron ore powder sample 400 according to the time of assimilation reaction of the iron ore powder sample 400, thereby accurately and objectively detecting the assimilation temperature of the iron ore powder. In particular, compared with a method for judging the assimilation temperature of the iron ore powder by observing deformation such as wetting angle and the like between the iron ore powder sample 400 and the calcium oxide tablet 130 through naked eyes or an image analysis system, the accuracy and the detection efficiency of the assimilation temperature detection are improved, and reliable data of the sintering performance of the iron ore powder are provided for sintering production; thereby avoiding the defects caused by subjective observation, realizing the on-line and visual detection of the opportunity of the assimilation reaction of the iron ore powder, the assimilation temperature of the iron ore powder and improving the accuracy of the detection of the assimilation temperature of the iron ore powder.
Example 2
As shown in fig. 4, the basic content of this embodiment is the same as embodiment 1, except that: the first electrode 221 and the second electrode 222 are arranged in parallel, the horizontal distance between the first electrode 221 and the second electrode 222 is d, d is less than or equal to R/2, and d=R/2 is taken as the diameter of the stacking surface of the iron ore powder sample 400 on the calcium oxide tablet 130 in the embodiment.
The first electrode 221 and the second electrode 222 penetrate through the calcium oxide tablet 130, so that the detection accuracy is improved, the change of the electric signal can be timely detected as long as the iron ore powder is assimilated at one place, and the detection accuracy is improved. The top of the electrode hole 131 of this embodiment is spaced from the upper surface of the calcium oxide sheet 130 by a thickness δ of 0.2-2mm, and δ=0.5 mm in this embodiment.
Example 3
As shown in fig. 7, the basic content of this embodiment is the same as embodiment 1, except that: the first electrode 221 of this embodiment is disposed within the calcium oxide pellet 130 and the second electrode 222 is disposed within the iron ore powder sample 400. The detecting unit 200 is located at the upper part of the iron ore powder sample 400, and the detecting unit 200 is located right above the first electrode 221, and the temperature measuring end 211 of the detecting unit 200 is close to the iron ore powder sample 400, so that the temperature measuring end 211 can timely and rapidly detect and obtain the temperature of the iron ore powder when assimilation reaction occurs, and the detecting accuracy is improved.
Example 4
As shown in fig. 8, the basic content of this embodiment is the same as embodiment 1, except that: the calcium oxide tablet 130 of the present embodiment is provided with 2 electrode holes 131, the first electrode 221 is disposed in the electrode hole 131 of the calcium oxide tablet 130, the second electrode 222 is also disposed in the electrode hole 131 of the calcium oxide tablet 130, and the first electrode 221 and the second electrode 222 are disposed in parallel.
The detecting unit 200 is located at the upper part of the iron ore powder sample 400, and the detecting unit 200 is located right above the symmetry axis of the first electrode 221 and the second electrode 222, and the temperature measuring end 211 of the detecting unit 200 is close to the iron ore powder sample 400, so that the temperature measuring end 211 can timely and rapidly detect and obtain the temperature of the iron ore powder when assimilation reaction occurs, and the detecting accuracy is improved.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the invention or the application and field of application of the invention.
More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. For example, in the present invention, the term "preferably" is not exclusive, and here it means "preferably, but not limited to". Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (8)
1. An assembling method of detection equipment for assimilation temperature of iron ore powder is characterized by comprising the following steps:
pressing the calcium oxide pressed sheet (130), and mounting a first electrode (221) and a second electrode (222) on the calcium oxide pressed sheet (130);
the method comprises the steps that a calcium oxide tablet (130) is arranged inside a heating unit (100), a first electrode (221) and a second electrode (222) are electrically connected to form an electric signal detection component (220), a temperature detection component (210) is arranged on the heating unit (100), and the temperature detection component (210) and the electric signal detection component (220) form a detection unit (200);
a gas nozzle (550) is arranged in the heating unit (100), and a gas supply cylinder (510) is connected with the gas nozzle (550) in the heating unit (100) through a gas supply pipeline (530) to form the detection equipment for the assimilation temperature of the iron ore powder.
2. The method for assembling the iron ore powder assimilation temperature detecting apparatus according to claim 1, wherein: the method comprises the following specific steps:
A. pressing a calcium oxide pressing sheet (130) in a die, forming an electrode hole (131) in the calcium oxide pressing sheet (130), placing a first electrode (221) in the electrode hole (131) formed in the calcium oxide pressing sheet (130), completely covering the first electrode (221) under the calcium oxide, and placing a second electrode (222) on the calcium oxide pressing sheet (130);
B. setting a calcium oxide tablet (130) inside a heating unit (100), connecting a first electrode (221) and a second electrode (222) with a detection device (223) to form an electric signal detection component (220), and installing a temperature detection component (210) on the calcium oxide tablet (130), wherein the temperature detection component (210) and the electric signal detection component (220) form a detection unit (200);
C. a gas nozzle (550) is arranged at the lower part of a calcium oxide tablet (130) of the heating unit (100), and a gas supply cylinder (510) is connected with the gas nozzle (550) in the heating unit (100) through a gas supply pipeline (530).
3. The utility model provides a detection equipment of iron ore powder assimilation temperature which characterized in that: comprising
A heating unit (100), wherein the heating unit (100) is used for heating the iron ore powder sample (400); and
a detection unit (200), the detection unit (200) comprising a temperature detection means (210) and an electrical signal detection means (220), the temperature detection means (210) being for detecting the temperature of the iron ore powder sample (400); the electric signal detection component (220) is used for detecting the change condition of the electric signal of the iron ore powder sample (400) in the heating process; the electric signal is a resistance signal or a conductivity signal or a voltage signal or a current signal;
a gas supply unit (500), wherein a gas supply cylinder (510) of the gas supply unit (500) supplies gas into the heating unit (100), and the gas supply unit (500) is used for adjusting the reaction atmosphere of the assimilation reaction; the heating unit (100) is internally provided with a calcium oxide tablet (130), the calcium oxide tablet (130) is used for bearing an iron ore powder sample (400), and a gas nozzle (550) of the gas supply unit (500) is arranged below the calcium oxide tablet (130); the temperature detection component (210) is arranged above the calcium oxide tabletting (130); the electric signal detection part (220) comprises a first electrode (221), a second electrode (222) and a detection device (223); the detection device (223) is electrically connected with the first electrode (221) and the second electrode (222); and the first electrode (221) and the second electrode (222) are kept in a non-contact state, and at least one of the first electrode (221) or the second electrode (222) is arranged in the calcium oxide tablet (130).
4. An apparatus for detecting an assimilation temperature of iron ore powder according to claim 3, wherein: the calcium oxide tablet (130) is provided with at least one electrode hole (131), and the electrode hole (131) is used for accommodating the first electrode (221) or the second electrode (222).
5. An apparatus for detecting an assimilation temperature of iron ore powder according to claim 3, wherein: the calcium oxide tablet (130) is provided with an electrode hole (131), the electrode hole (131) is used for accommodating the first electrode (221), and the second electrode (222) is placed on the tablet upper surface (132) of the calcium oxide tablet (130).
6. An apparatus for detecting an assimilation temperature of iron ore powder according to claim 3, wherein: the first electrode (221) and the second electrode (222) are arranged in parallel, the horizontal distance between the first electrode (221) and the second electrode (222) is d, d is less than or equal to R/2, and R is the diameter of the stacking surface of the iron ore powder sample (400) on the calcium oxide tablet (130).
7. An apparatus for detecting an assimilation temperature of iron ore powder according to any one of claims 3 to 5, wherein: the air supply unit (500) comprises an air supply cylinder (510), a flowmeter (520) and an air spray head (550), wherein the air spray head (550) is arranged in the middle of the heating unit (100), the air supply cylinder (510) is connected with the air spray head (550) in the heating unit (100) through an air supply pipeline (530), and the flowmeter (520) is arranged on the air supply pipeline (530).
8. A method for simulating different atmospheres to detect assimilation temperature of iron ore powder is characterized by comprising the following steps: the iron ore powder assimilation temperature detection device according to any one of claims 3 to 7 is used, the gas supply cylinder (510) of the gas supply unit (500) supplies gas into the heating unit (100), the reaction atmosphere of the assimilation reaction is regulated, and the electric signal change condition of the iron ore powder sample (400) is detected in the process of temperature rise, and the iron ore powder assimilation temperature is judged by the electric signal change of the iron ore powder sample (400).
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| CN107894439A (en) * | 2017-12-26 | 2018-04-10 | 柳州钢铁股份有限公司 | Iron Ore Powder assimilates temperature-detecting device |
| CN107941846A (en) * | 2017-12-26 | 2018-04-20 | 柳州钢铁股份有限公司 | Simulate the Iron Ore Powder assimilation system for detecting temperature of different condition |
| CN109283212B (en) * | 2018-11-29 | 2022-03-29 | 安徽工业大学 | Method for detecting assimilation reaction temperature and assimilation reaction speed of iron ore powder |
| CN109517979B (en) * | 2018-11-29 | 2020-05-12 | 安徽工业大学 | Ore blending method for reducing iron ore sintering carbon consumption and discharge |
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