Testing method for mixing degree of iron ore pellet mixture

Abstract

The invention discloses a testing method for the mixing degree of an iron ore pellet mixture. The method comprises the following steps that 1, a sampling interval is determined by taking an outlet as a starting point and taking the position 3-15 meters away from the outlet as an end point on a conveyer belt behind the material outlet of iron ore pellet mixing equipment, the sampling interval is divided into N sections so that sampling can be conveniently performed in the sampling interval, or sampling is performed at time intervals, and the sample number is 1-N or 1,2,3,4...N; 2, for selected N samples, the water content Xi of each sample is measured, wherein i=1,2,3...N; 3, average value X of the water content of the measured N samples in the step 2 is evaluated; 4, the water content standard deviation S of the water content Xi of the measured N samples in the step 2 and the average value X in the step 3 is evaluated; 5, variable coefficient (CV) value (%) of the needed water content in a test is evaluated by the average value X obtained in the step 3 and the standard deviation S obtained in the step 4 according to the formula CV=(S / X)*100.

Description

technical field [0001] The invention relates to a method for testing the mixing degree of an iron ore pellet mixture, in particular to the field of iron ore sintered pellets [0002] The invention relates to mixing raw materials and belongs to the field of iron and steel metallurgy. Background technique [0003] In the iron and steel metallurgy industry, the pelletizing method and the sintering method are two major methods of agglomeration of mineral raw materials, and they are also two very important agglomeration processes for artificial agglomerates of blast furnace charges. The pelletizing method appeared late, but compared with the sintering method, it has advantages in environmental protection, energy saving, raw material adaptability, increasing blast furnace output, and reducing production costs. Therefore, the pelletizing method is gradually attracting the attention of the industry, and the development speed faster and faster. Since the 21st century, major iron an...

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Problems solved by technology

Most of these are used in the pharmaceutical, food and feed industries, and most of them are subject to certain limitations and have extremely obvious defects, which are almost impossible to achieve in the test of the mixing degree of raw materials for metallurgical pellets.

[0008] The scanning electron microscope method is to analyze the electronic image of the sample. Although the observation of the sample is intuitive and convenient, the sampling of this method is very small, the representativeness is poor, and the uniformity of the powder cannot be quantitatively described, and the scanning electron microscope is expensive. The test cost is too high; the distribution fractal dimension method uses the fractal dimension of the particle size distribution to analyze the uniformity, but the value of the fractal dimension of the particle size distribution will occasionally appear negative, indicating that the calculation method has certain limitations when calculating the fractal dimension; pixel grid analysis The method is to divide the mixed powder with a large difference in computer grayscale into pixel grids for comparison. This method is intuitive, simple, easy to operate and can avoid problems caused by sampling, but the coverage of the photo is too small and the representation is poor. And it can only analyze the mixed powder with a large difference in grayscale; the determination of element content is a quantitative detection of an element in the material, and the measured element must be stable in the material and easy to detect. Through multiple sampling Measurement, compared with the standard content to obtain the mixing effect of the material, the determination of the element content of the second method is more complicated, and because the content of each element in the mixed material iron concentrate and bentonite in the field of metallurgical pellets varies greatly, it is difficult to find stable and easy-to-detect elements, so Can't apply this method

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