KR100217840B1 - Apparatus and method of analyzing feo of iron ore from magnetic properties - Google Patents

Abstract

The present invention relates to an apparatus and method for analyzing the FeO content in the sintered ore as a blast furnace raw material using magnetic properties, in the apparatus for analyzing the FeO component using magnetism, by providing a temperature measuring means and a temperature control means SUMMARY OF THE INVENTION An object of the present invention is to provide an analysis device of iron oxide components and a method for improving accuracy and reproducibility by excluding temperature dependence of the analysis device through temperature compensation.

The present invention provides a device for analyzing the FeO content in the iron ore in the form of powder using magnetic properties, the filling unit 21 is configured to be filled with a powder sample put into the sample container; A measurement coil sensor 22 configured to form a central portion so that the sample container is inserted, and a resonant coil of an oscillator is wound outside of the central portion of the sample vessel; A temperature controller 30 configured to adjust the temperature of the measurement coil sensor; An oscillator 24 for oscillating a frequency by receiving a magnetic signal output from the measuring coil sensor; A frequency calculator 25 that calculates a difference between the oscillation frequency and the reference frequency; It includes a computer 26 for obtaining the correlation between the difference between the oscillation frequency and the reference frequency at various temperatures of the measuring coil sensor and the temperature, and the correlation between the magnetic index difference and the FeO content at room temperature. An apparatus for analyzing FeO components in iron ore using magnetic properties and methods for analyzing FeO components using the same are provided.

Description

Iron Oxide (FeO) Component Analysis in Iron Ore Using Magnetic Properties and Its Method

1 is a schematic diagram of a FeO analyzer using a conventional magnetic scale method.

2 is a schematic diagram of a FeO analyzer using a conventional C-type coil.

3 is a schematic diagram of a conventional FeO automatic analyzer.

4 is a schematic diagram of an automatic FeO component analyzer of the present invention.

5 is a configuration diagram of the filling part showing an example of the filling part of the automatic FeO component analyzer according to the present invention.

6 is a configuration of a measurement coil sensor and an example of a measurement coil sensor and a temperature control unit of an automatic FeO component analyzer according to the present invention.

7 is a graph showing the correlation between the FeO content and the frequency difference at room temperature.

8 is a graph showing the change in frequency difference according to the analysis temperature.

* Explanation of symbols for main parts of the drawings

21: filling part 22: measuring coil sensor

30: temperature control unit 24: oscillator

25: frequency calculator 26: computer

40: thermocouple

The present invention relates to an apparatus and method for analyzing the FeO content in sintered ore, which is a raw material of iron ore, in particular blast furnace, by using magnetic properties, and more particularly, to Korean Patent Application No. 94-38976.

Sintered ore is the main charge of blast furnace, and the quality of sintered ore has a great influence on the stable operation and productivity of blast furnace. In particular, in order to secure the air permeability of the blast furnace shaft portion, improvement and stabilization of the RDI of the sintered ore is required. Since the FeO component of the sintered ore has a strong correlation with the strength and the reduction differentiation index of the sintered ore, the iron sintering plant focuses on the FeO component. As a method of analyzing the FeO content in the sintering plant, the wet chemical analysis method is widely used because of its excellent accuracy, and other methods, such as an XRD (X-raydiffractometer) method, a gas pressure measurement method and a magnetic method, have been tried. In particular, the analysis method using magnetism has the advantage of rapid analysis, but there is a problem that the accuracy of the analysis is lowered.

Since the present invention relates to an apparatus and an analysis method for minimizing measurement error, which is a disadvantage of the conventional analysis method using magnetic properties, the following describes an analysis technology using magnetic properties.

First, the method of analyzing FeO content using a general magnet will be described. FeO in iron ore does not exist in the wustite state, which is the state of FeO alone, but mostly in the FeO.Fe ₂ O ₃ = Fe ₃ O ₄ state, that is, in the magnetite state. Magnetite is a ferromagnetic phase, so if magnetite is present in iron ore, iron ore becomes magnetic. Since a linear relationship is established between the FeO content in the iron ore, that is, the magnetite content and the magnetization amount, the FeO content in the iron ore can be measured by measuring the magnetization amount. Conventional FeO analysis methods for analyzing FeO content in iron ore include a magnetic balance method and a type C measuring coil method. First, the principle of the magnetic scale method is explained.

Magnetic scale method, as shown in Fig. 1, when two magnets (1) in the opposite direction and the magnetic ore sample (2) between the magnetic poles of the magnetic field is moved, this movement is a photodiode (3) It is measured by photodiode.

At this time, if the opposite magnet coil is present and the current passes through the coil, it generates the same size and opposite direction obtained by the movement of the magnetic lines, and the whole system is returned to the initial state, that is, the equilibrium state. At equilibrium, the current passing through the coil is proportional to the force generated by the sample and the passing current is measured by the voltage drop.

After that, the correlation between the FeO content and the voltage difference of the sample can be obtained to analyze the FeO.

Hereinafter, the FeO analyzer using the C-type coil will be described.

When the coil 12 is wound around the high permeability material 11 as shown in FIG. 2 and the magnetic sample 13 is brought closer, the magnetic flux is induced as indicated by the dotted line. As magnetic flux 14 passes through the coil, a change in inductance occurs in the coil, which can be measured.

The linear relationship between the change in inductance and the permeability of the sample can be obtained as follows.

Since μo = 1, the permeability of the sample 13 can be obtained by measuring the change in inductance of the circuit according to the charging of the magnetic sample. Therefore, since the FeO content in iron ore has a linear relationship with the permeability, the FeO content can be obtained from the relationship between the FeO content in the iron ore and the measured permeability.

As described above, in the case of the FeO measuring apparatus using a magnetism developed in the related art, an error does not occur in the case of a bulky solid sample, but an error occurs in the case of a powder sample. In particular, in case of the device that measures the permeability by adopting the type C coil, all the samples should be measured after solidifying by compacting (disk) to disk type because of this problem.

In addition, according to the present inventors, the magnetic permeability measurement method using the coil has a measurement error because the inductance itself varies depending on the temperature change.

The present inventors have proposed a FeO content analyzing apparatus and method for improving the problems of the conventional FeO component analysis method using the above-mentioned magnet and has filed a patent with Korean Patent Application No. 94-38976.

As shown in FIG. 3, the FeO component analyzer described in the above-mentioned Korean patent application includes a filling part 21, a measuring coil sensor 22, a constant temperature holding part 23, an oscillator 24, a frequency calculator ( 25 and a computer 26.

In the case of measuring the content of FeO using the above-described FeO component analysis device, the relative deviation of each measurement is only ± 1/290 in the same sample. Accordingly, the device error limit of the device itself is ± 0.01% when converted into FeO content. Within and have excellent accuracy.

However, the above-mentioned method should always be heated to 40 ℃ or higher with the constant temperature holding device when analyzing FeO component. Therefore, the problem of short-circuit of the heating element occurs due to the long-term use of the heating element. There is a problem that the analysis speed is slowed down.

The present inventors conducted research and experiments to solve the above-mentioned problems of the conventional FeO component analysis method, and based on the results, the present invention proposes the present invention. In the device, by providing a temperature measuring means and a temperature control means to remove the temperature dependence of the analysis device through the temperature correction to provide an analysis device and analysis method using the iron oxide component to further improve the accuracy and reproducibility, the purpose There is this.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

The present invention relates to a device for analyzing the FeO content in the iron ore in the form of powder using magnetic properties, the filling unit configured to fill the powder sample put into the sample container; A measurement coil sensor configured to form a center so that the sample container is inserted, and a resonant coil of an oscillator is wound outside of the center; A temperature controller configured to adjust a temperature of the measurement coil sensor; An oscillator oscillating frequency by receiving a magnetic signal output from the measuring coil sensor; A frequency calculator for calculating a difference between the oscillation frequency and the reference frequency; Magnetic properties, including computer, to calculate the correlation between temperature and difference between oscillation frequency and reference frequency and the correlation between magnetic index difference and FeO content at room temperature The present invention relates to a FeO component analysis device in iron ore using the present invention.

In addition, the present invention is a method for analyzing the content of FeO in the powder form of iron ore using magnetic properties, the filling step of filling the sample container with iron ore known powder FeO content; Charging a sample container containing a filled sample to the center of a measuring coil sensor in which a resonant coil of an oscillator is wound outside; Calculating a first frequency difference which is a difference between an oscillation frequency and a reference frequency corresponding to a magnetic signal output from the measuring coil sensor at room temperature; Obtaining a correlation between the first frequency difference obtained as described above and the FeO content in the iron ore; Oscillating the frequency by the oscillator while changing the temperature of the measuring coil sensor in which the sample container containing the filled sample is loaded; Calculating a second frequency difference which is a difference between the oscillated frequency and the reference frequency as described above; Obtaining a correlation between a temperature of the measuring coil sensor and a second frequency difference; Preparing a powder iron ore sample to be analyzed for FeO content; Measuring an FeO component analysis temperature; Measuring a frequency difference of the iron ore sample at the analysis temperature; Obtaining the theoretical frequency difference by substituting the analysis temperature into a correlation between the temperature of the measuring coil sensor and the second frequency difference; Obtaining a difference (hereinafter, referred to as magnetic index difference) between the theoretical frequency difference obtained as described above and the first frequency difference at room temperature; Obtaining a correction frequency difference by subtracting the magnetic index difference from the frequency difference at the analysis temperature measured above; And calculating the FeO content by substituting the correction frequency difference obtained as described above into a correlation between the first frequency difference obtained above and the FeO content in the iron ore (FeO) in the iron ore using the magnetic properties. ) Component analysis method.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The FeO component analyzer of the present invention is schematically shown in FIG.

As shown in FIG. 4, a filling part 21, a measuring coil sensor 22, an oscillator 24, a frequency calculator 25, a computer 26, a temperature controller 30, and a thermocouple 40 are included. It is configured by.

As shown in FIG. 5, the filling part 21 includes an upper portion 211a, a central portion 211b, and a lower portion 211c, and a powder sample container accommodating portion 211d is formed so that the sample container is charged. And a vibrator 212 provided below the filler 211.

The vibrator 212 vibrates up and down when the sample container contacts, so that the powder sample injected into the sample container is filled.

The size of the sample container is not particularly limited, but a straight container having an inner diameter of 12 mm, an outer diameter of 13 mm, and a height of 80 mm is more preferable.

The powder sample container accommodating part 211d of the filler 211 has a diameter slightly larger than the diameter of the sample container so that the sample container is moved up and down as well as a left and right movement is caused by the reciprocating motion of the vibrator 212. It is desirable to have a.

More preferably, the diameter of the powder sample container accommodating portion 211d is to have a size of 105-110% of the outer diameter of the sample container.

In addition, it is preferable to use polypropylene or polycarbonate which is transparent or translucent and free from impact damage by vibration so that the state of the filled powder of the sample container can be easily observed.

The filling part of the analyzing apparatus of the present invention is not limited to the structure shown in FIG. 5, and any filling material can be used as long as it is configured to fill a powder sample.

On the other hand, the measurement coil sensor 22, as shown in Figure 6, having a shape substantially similar to the filling machine 211, consisting of an upper portion 22a, a central portion 22b, and a lower portion 22c The filling sample container accommodating part 22d is formed so that a sample container may be charged.

The resonant coil of the oscillator is wound outside the central portion 22b.

The filling sample container receiving portion 22d has a diameter of about 101-105% of the outer diameter of the sample container, so that the sample container can be easily inserted and can be a space between the inner wall of the receiving portion 22d and the inserted container. It is desirable to.

The structure of the measuring coil sensor 22 of the analyzing apparatus of the present invention can be variously changed without being limited to that shown in FIG.

The temperature control part 30 is installed in the lower part of the measuring coil sensor 22 as shown in FIG. 6, and the temperature adjusting part 30 is installed in the lower part of the measuring coil sensor 22, and the temperature increase rate. It is configured to include a temperature raising device 31 configured to be adjustable, a fan 33 for cooling, and a temperature controller 32 for controlling the temperature raising device 31 and the fan 33.

In addition, a thermocouple 40 for measuring temperature is attached to the central portion 22b of the measurement coil sensor 22.

The temperature raising device 31, the temperature controller 32, the fan 33 and the thermocouple 40 can be any of those commonly used.

In the case of attaching the fan 33 as described above, there is a side effect of reducing the temperature deviation by preventing the local heating as well as controlling the cooling rate.

The oscillator 24 is configured to receive a magnetic signal output from the measuring coil sensor 22 to oscillate a frequency.

The frequency calculator 25 is configured to calculate the difference between the frequency oscillated from the oscillator 24 and the reference frequency.

The computer 26 calculates a correlation between the difference between the oscillation frequency and the reference frequency at various temperatures of the measurement coil sensor 22 and the temperature of the measurement coil sensor 22, and also the difference in magnetic index at room temperature. And the correlation between the FeO content and the like.

The method of analyzing a FeO component using the FeO component analyzer in iron ore of this invention comprised as mentioned above is demonstrated.

In order to analyze the FeO component, first, a powder iron ore sample having a known FeO content by a wet analysis method is introduced into the sample container, and then the sample container is inserted into the sample container inserting portion 211d of the filling machine 211, and then vibrator ( 212) must be operated to fill the powder sample.

Next, the sample container containing the filled sample as described above is inserted into the filling sample container receiving portion 22d of the measuring coil sensor 22 at room temperature, and then an electric current is applied to the measuring coil sensor 22 to oscillator 24. Oscillate frequency).

Next, the frequency calculator 25 obtains the first frequency difference, which is the difference between the frequency oscillated in the oscillator 24 and the reference frequency.

Next, the correlation between the first frequency difference at room temperature obtained by the computer 26 and the FeO content in the iron ore is obtained.

It is preferable to obtain the above correlation by the least squares method.

Next, the oscillator 24 oscillates the frequency while changing the temperature of the measuring coil sensor 22 in which the sample container containing the filled sample is loaded.

Next, the frequency calculator 25 calculates a second frequency difference, which is the difference between the oscillated frequency and the reference frequency.

Next, a correlation between the temperature of the measuring coil sensor and the second frequency difference is obtained from the computer 26. It is desirable to obtain this correlation periodically, preferably once a month, because the correlation can be changed by factors such as temperature and contamination around the measuring coil sensor and humidity due to the characteristics of the electronic circuit. .

The correlation is preferably obtained by the least squares method.

Of course, it is natural that the correlation between the temperature of the measuring coil sensor and the second frequency difference can be obtained before the correlation between the first frequency difference and the FeO content in the iron ore.

Next, a powder iron ore sample to be analyzed for FeO content is prepared.

Next, the frequency difference between the FeO component analysis temperature and the analysis temperature for the powder iron ore sample to be analyzed is measured.

Next, the theoretical temperature difference is obtained by substituting the analysis temperature as a correlation between the temperature of the measuring coil sensor and the second frequency difference.

Next, a magnetic index difference which is a difference between the theoretical frequency difference obtained as described above and the frequency difference at room temperature is obtained.

Next, the difference of the magnetic indices is obtained by subtracting the difference of the magnetic index from the measured frequency difference at the analysis temperature.

Next, the FeO content is obtained by substituting the above-described correction frequency difference into the correlation between the first frequency difference obtained above and the FeO content in the iron ore.

The theoretical frequency difference, magnetic index difference, correction frequency difference, and FeO content described above can be obtained from the computer 26.

It is preferable to use a FeO content of 7-9 wt% as the powder iron ore sample to obtain the correlations, because the correction curve is also changed according to the FeO content of the sample.

Iron ores with a FeO content of 7-9 wt% are those commonly used in sintering plants.

Hereinafter, the present invention will be described in more detail with reference to Examples.

EXAMPLE

After charging the sample filled in the powdered sintered ore sample with FeO content as shown in FIG. It is shown in the figure.

On the other hand, after loading the sample filled in the powdered sintered ore sample with FeO content of 7.22% in the filling unit into the measuring coil sensor, the temperature rising rate of 0.5 ℃ / min per minute to 20-40 ℃ by the temperature raising device Heated to.

At this time, the temperature of the measuring coil sensor was measured by a thermocouple. The inductance change in the measuring coil sensor was oscillated using an oscillator and the frequency difference was calculated by a frequency calculator.

The change of the frequency difference according to the temperature change obtained as described above is shown in FIG.

When the FeO content is to be analyzed, the FeO content is analyzed by measuring only the frequency difference between the analysis temperature and the analysis temperature.

That is, the theoretical temperature difference is obtained by substituting the analysis temperature in the relational equation of FIG. 8, and the magnetic index difference which is the difference between the theoretical frequency difference and the frequency difference at room temperature is obtained, and the magnetic index is compared to the frequency difference at the analysis temperature. By subtracting and subtracting the difference, the correction frequency difference is calculated. Substituting the correction frequency difference into FIG. 7 causes the FeO content to be analyzed.

As described above, the present invention has the effect of reducing the deviation due to temperature and improving the accuracy of the measurement as well as problems such as extending the life of the analyzer and short circuit of the heating element.

Claims (3)

An apparatus for analyzing the FeO content in the iron ore in the form of powder using magnetic properties, comprising: a filling unit 21 configured to fill a powder sample charged in a sample container; A measurement coil sensor 22 configured to form a central portion so that the sample container is inserted, and a resonant coil of an oscillator is wound outside of the central portion of the sample vessel; A temperature controller (30) configured to adjust the temperature of the measurement coil sensor (22) including a temperature raising device (31), a temperature controller (32), and a cooling fan (33); A thermocouple 40 attached to the measuring coil sensor 22 and configured to measure a temperature of the measuring coil sensor 22; An oscillator 24 for oscillating a frequency by receiving a magnetic signal output from the measuring coil sensor 22; A frequency calculator 25 that calculates a difference between the oscillation frequency and the reference frequency; Computer for calculating the correlation between the difference between the oscillation frequency and the reference frequency at various temperatures of the measuring coil sensor and the temperature of the measuring coil sensor, and the correlation between the magnetic frequency difference and the FeO content at room temperature Iron oxide (FeO) component analysis device in iron ore using a magnetic property consisting of. Claims [1] A method for analyzing the FeO content in a powdered iron ore using magnetic properties, the method comprising: filling a sample container with a powder iron ore sample having a known FeO content; Charging a sample container containing a filled sample to the center of a measurement coil sensor in which a resonant coil of an oscillator is wound outside; Calculating a first frequency difference which is a difference between an oscillation frequency and a reference frequency corresponding to a magnetic signal output from the measuring coil sensor at room temperature; Obtaining a correlation between the first frequency difference obtained as described above and the FeO content in the iron ore; Oscillating the frequency by the oscillator while changing the temperature of the measuring coil sensor in which the sample container containing the filled sample is loaded; Calculating a second frequency difference which is a difference between the oscillated frequency and the reference frequency as described above; Obtaining a correlation between a temperature of the measuring coil sensor and a second frequency difference; Preparing a powder iron ore sample to be analyzed for FeO content; Measuring an FeO component analysis temperature; Measuring a frequency difference of the iron ore sample at the analysis temperature; Obtaining the theoretical frequency difference by substituting the analysis temperature into a correlation between the temperature of the measuring coil sensor and the second frequency difference; Obtaining a difference (hereinafter, referred to as magnetic index difference) between the theoretical frequency difference obtained as described above and the frequency difference at room temperature; Obtaining a correction frequency difference by subtracting the magnetic index difference from the frequency difference at the analysis temperature measured above; And calculating the FeO content by substituting the correction frequency difference obtained as described above into a correlation between the first frequency difference obtained above and the FeO content in the iron ore (FeO) in the iron ore using the magnetic properties. ) Component analysis method. 3. The method for analyzing FeO component in iron ore using magnetic properties according to claim 2, wherein the powdered iron ore sample contains 7-9 wt% of FeO.