Testing method for mixing degree of iron ore pellet mixture

A test method and technology of iron ore pellets, applied in the field of iron ore sintered pellets, can solve the problems of inability to quantitatively describe powder uniformity, complex element content determination by secondary methods, and high test costs

Active Publication Date: 2015-10-21
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 dimensio

Method used

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  • Testing method for mixing degree of iron ore pellet mixture
  • Testing method for mixing degree of iron ore pellet mixture
  • Testing method for mixing degree of iron ore pellet mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The specific steps of the measurement method are as follows:

[0066] (1), take one set of moisture measuring instrument (infrared (halogen) moisture analyzer (model MS-100, Harbin Yuda Electronic Technology Co., Ltd.), a plurality of sampling sealed bags;

[0067] (2) Sampling in subregions in the mixed material of the pellet raw materials to be tested. In order to prevent water evaporation and ensure the validity and reliability of the samples, the sampling area should be in the vertical intensive mixer as a primary mixer (i.e. iron ore pellets) mixing equipment) within 10m of the material outlet and divide the interval into 8 equal-length sampling sections, take samples from each section simultaneously or synchronously, and then package the samples obtained in each section in step (1 ) in a sealed bag, take 8 samples, the number of samples is recorded as N=8, and the weight of each sample is not less than 10g;

[0068] (3), from the sample taken in step (2), take pa...

Embodiment 2

[0076] The specific steps of the measurement method are as follows:

[0077] (1), take a moisture measuring instrument (Kesaisi microwave moisture meter, MSF-300, Beijing Kesaisi Technology Co., Ltd.), a plurality of sampling sealed bags;

[0078] (2) Sampling in subregions in the mixed material of the pellet raw materials to be tested. In order to prevent water evaporation and ensure the validity and reliability of the samples, the sampling area should be in the vertical intensive mixer as a primary mixer (i.e. iron ore pellets) mixing equipment) within 10m of the material outlet and divide the interval into 6 equal-length sampling sections, take samples from each section simultaneously or synchronously, and then package the samples obtained in each section in step (1 ) in a sealed bag, take 6 samples, the number of samples is recorded as N=6, and the weight of each sample is not less than 10g;

[0079] (3), from the sample taken in step (2), take part of the material respec...

Embodiment 3

[0087] Sampling at time intervals. The specific steps of the measurement method are as follows:

[0088] (1), take a moisture measuring instrument (Guanya infrared moisture analyzer, SFY-20, Shenzhen Guanya Electronic Technology Co., Ltd.), a plurality of sampling sealed bags;

[0089] (2), at the material outlet of the vertical intensive mixer (i.e. iron ore pellet mixing equipment) as a primary mixer, take 10 samples and encapsulate them in sealed bags respectively at an interval of 5 seconds, take 10 samples, and sample The number is recorded as N=10, and the weight of each sample is not less than 10g;

[0090](3), from the sample taken in step (2), take part of the material respectively in the moisture measuring instrument in step (1), test its moisture content, the moisture content percentage of each sample, that is, divide the moisture mass by the measured sample mass, recorded as X i , i=1, 2, 3, 4, 5, 6, 7, 8, 9, 10;

[0091] (4), the water content of N samples mea...

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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...

Claims

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Application Information

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IPC IPC(8): C22B1/24
Inventor 戴波刘克俭张震戴传德
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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