JPS5842732A - Measuring method for characteristic of sintered ore - Google Patents

Abstract

PURPOSE:To measure the characteristics of sintered ore such as a reduction powdering property, reducibility and the like quickly with good accuracy by picking up the images of the macrostructure and microstructure of samples, and incorporating a series of processes including decision and quantitative determination of respective compsns., and calculation of physical characteristics. CONSTITUTION:A low magnification microscope 1, a high magnification microscope 1', computer vidicons 2, 2', a camera controller 3, an electric calculator 4, a central processing unit 4a, an interpreter 4b, a frame memory 5, a hard copy 6, a plotter 7, a line printer 8 and a disc file 9 are provided. The reflected images of the microscopes 1, 1' are converted to video signals by the vidicons 2, 2' and the video signals are fed to the calculator 4. Luminance levels are detected there by the picture elements divided to about 65,000 pieces per visual field, and geometrical and statistical operations are applied to these levels to calculate the area ratios of the respective structures and the quantitative values of the structures and the indices indicating the characteristics of sintered ore are determined. The results thereof are displayed by a monitor television, hard copies, a plotter, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the properties of sintered ore, in which each composition of the macrostructure and microstructure of sintered ore is quantified, and these quantities are used to determine the reducibility, reduction powderability, etc. The objective is to quickly and accurately measure the properties of sintered ore.

It is known that the physical properties of sintered ore are closely related to the sintered ore structure, and for this reason, various property measurement methods focusing on the sintered ore structure have been proposed. Typical examples include the so-called Permagnag method, in which a sample is placed in a cylinder equipped with a coil, and changes in the resonance frequency occur depending on the proportion of magnetite contained therein, and the method uses the magnetic susceptibility of the sample. These methods all have in common that only iron oxides such as hematite and magnetite can be quantified.

However, it is thought that the physical properties of sintered ore do not simply depend on the quantification of iron oxides, and therefore other structures, such as calcium ferrite, slag, pores, etc., are not quantified. It is difficult to say that the method has sufficient accuracy to be applicable to the management of eastern operations. In addition, according to the studies conducted by the present inventors, the physical properties of sintered ore are not limited to its microstructure, but are also closely related to its macrostructure. It has been found that it is not possible to adequately measure the physical properties of the tissue without comprehensive analysis of the tissue, including its physical properties.

However, all conventional measurement methods including the above method target the microstructure of sintered ore, and focus on the overall structure including the macrostructure of sintered ore.
Also, I have yet to find an example of this analysis.

The present invention was devised in view of the current situation, and its basic feature is that the macrostructure and microstructure of a sintered ore sample are photographed, and each image is imaged to create a microstructure based on the differential pressure of reflectance. Each ratio is measured, and each composition and pore in the macrostructure and microstructure are determined and quantified from the structure ratio based on the difference in reflectance, and the properties of the sintered ore are calculated by calculating from this quantitative analysis value. By doing so, it becomes possible to quickly and accurately measure the properties based on the overall discrimination and quantification of the sintered ore structure.

The physical properties of sintered ore, such as room temperature strength, hot strength, reducibility, and reduction pulverizability, are strongly correlated not only with the microstructure of hematite and magnesite, but also with the macrostructure of the source ore and macropores. As described above, the present invention involves quantifying the composition and pores of both the macrostructure and microstructure of sintered ore.

The present inventors carried out the quantification of each composition based on the following process: imaging of the macrostructure and microstructure, and the difference in reflectance due to image processing (measurement of the tissue proportion of each composition, We have discovered that this can be done quickly and with high precision by taking a series of processes of quantifying each composition based on constant values on both sides. Therefore, in the present invention, first, images of the macrostructure and microstructure of the sample are taken. This imaging is carried out using a TV camera or the like through a microscope with different magnifications.The macrostructure of sintered ore is defined as a structure that is such that the original ore, sintered parts, and macropores can be distinguished. The term "microstructure" refers to a structure in which hematite, magnesite, calcium 7-elite, slag, and micropores can be distinguished. Therefore, the magnification for each imaging is 2 to 2.
10 times, and the latter about 100 to 400 times. To explain in more detail the process up to imaging as described above, first, 10 to 20 samples are sampled from the actual sintered ore, embedded in resin, and the surface is polished with emery paper. Imaging of the macrostructure is performed via a magnification microscope. The above emery paper is 432
A value in the range of 0 to 1000, usually about 4 to 600, is used. The sample is then diamond polished or equivalently polished, and the microstructure is then imaged using the high magnification microscope.

Regarding the images of the macrostructure and microstructure obtained by the above imaging, the reflectance of the light is measured based on the differential pressure of the reflectance (tissue ratio). In the case of the macrostructure, the base ore, sintered part (excluding the base ore and macropores), and macropores are identified in the order of highest reflectance, and in the case of the microstructure, hematite, magnetite, Calcium ferrite, slag, and micropores are identified. In the present invention, the area ratio of each structure having a difference in reflectance in these two structures is determined as the structure ratio.

However, the discrimination and quantification of each tissue component based on the differential pressure of the reflectance alone is not sufficient for the quantification of the tissue, which is the main focus of the present invention. In other words, hematite excluding the original ore, that is, so-called secondary hematite (included in the sintered part in the microstructure) has a strong correlation with the reduction powdering rate, but the reflectance of the secondary hematite is different from that of the original ore. They are the same, and therefore it is impossible to distinguish between the two only by image processing of the microstructure alone, let alone the macrostructure. Therefore, in the present invention, the secondary hephtite structure Y is determined from the original ore structure determined by the difference in reflectance and the same (discriminated hematite structure (including the original ore structure!)), and this is quantified. Only then can the overall quantification of the macrostructure and microstructure become possible. Based on each quantitative analysis value, each physical property of the sintered ore is calculated, for example, the quantification of the macropores. The reduction rate is calculated based on the analysis value, and the reduction powdering rate is calculated based on the quantitative analysis value of secondary hematite or the quantitative analysis value of hematite and the original ore.

Specifically, an automated measurement system is used for the above process. Is this system a microscope, an imaging device, and a processing device for image processing and a series of calculations based on this? quantification of each composition through a series of processes from images of the macrostructure and microstructure taken through a microscope, and based on this (calculate the physical properties and demonstrate this. Device K measures the relationship between each reflectance and each tissue component, the relationship between the measured value (area ratio) of each tissue component, weight, and volume (quantitative analysis value), and furthermore K measures the quantitative analysis value and burnout of each tissue component. The physical properties of the condensation are memorized in advance, and finally,
Quantified weight of each tissue, volume Il! An index indicating the properties of sintered ore can be obtained by calculation according to .

Figure 1 shows such an automated measurement system, where 1 is a low magnification microscope, 1' is a high magnification microscope, 2.2
' is a computer business controller, 3 is a camera controller,
Reference numeral 4 denotes an electronic computer for performing the above-mentioned arithmetic processing, 4m a central processing unit, 4b an interpreter, 5 a frame memory, 6 a hard copy, and T a plotter.

8 line printer, 9 is a disk file. According to these measuring systems, the image reflected by the microscope 1.1' is converted into a video signal by the computer vidicon 2,2, and this is sent to the computer 4. The electronic computer detects each brightness level using approximately 65,000 pixels divided into one field of view, performs geometric and systematic calculations, calculates the area ratio of each tissue component, and then calculates the area ratio of each tissue component as described above. Based on the quantitative value of the structure and this quantitative value, an index indicating the properties of the sintered ore is calculated.Such calculation results are displayed on a monitor TV, hard copy, plotter, line printer, etc., and the measured data is stored in a disk file, etc. When imaging the sample, the brightness is measured using a standard reflector before and after imaging, and the reflectance of the tissue is calibrated.

FIGS. 2 and 3 show an example in which the relationship between the structure and properties of sintered ore was investigated using the method of the present invention. Of these, Figure 1 shows the relationship Z between the macropore quantitative analysis value of the sample in the pallet layer direction and the reduction rate, and Figure 2 shows the relationship between the secondary hematite quantitative analysis value and the reduction powdering rate. According to these studies, there is a strong correlation between each structure and physical properties. In the present invention, for example, (reducibility rate) = a X (macropore quantitative analysis value)
10 b (reduction powdering rate) = a X (secondary hematite quantitative analysis value > b x (
Original ore quantitative analysis value 1) +c However, each physical property is determined by a formula such as a, b, c...constants.

As described above, according to the present invention, when measuring the properties of sintered ore, not only the microstructure of sintered ore but also the composition of the macrostructure is used as a measurement factor, and each structure is quantified and The properties are measured based on the imaging of both tissues, the measurement of the tissue proportion based on the difference in reflectance for each image, the constant value on both sides (discrimination and quantification of each composition, and the physical properties based on this quantitative analysis value). Since we have adopted a series of processes to calculate physical properties, we can quickly and accurately measure sintered ore properties such as reduction powderability and reducibility, and as a result, feedback to actual operations can be quickly provided. Moreover, it is possible to produce sintered ore with good properties with accuracy, so this invention has great industrial effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a measurement system used for implementing the present invention. FIG. 2 shows the relationship between macropore quantitative analysis values and reduction rate. FIG. 3 shows the relationship between the secondary hematite quantitative analysis value and the reduction powdering rate. Patent applicant Nippon Kokan Co., Ltd. Inventor Yama 1) Ken Daido
Mitsuru Uesugi Akito
Takashi Shibuya
Saito confusion Taninaka Hide Shindo Take
Former Katsuhiro - Teru,

Claims (1)

[Claims] The macrostructure and microstructure of the sintered ore sample are each imaged, and based on the difference in reflectance (tissue ratio) for each image, the macrostructure and A method for measuring the properties of sintered ore, characterized in that the properties of the sintered ore are measured by determining and quantifying each composition and pore in the microstructure, and calculating the properties of the sintered ore by calculating from the quantitative analysis values.'1.