Method for testing even mixing degree of mixed iron mine pellet material

A test method and technology of iron ore pellets, which are applied in iron ore sinter pellets and iron and steel metallurgy fields, can solve the problems of less sampling, poor representativeness, and complex element content determination by secondary methods.

Active Publication Date: 2015-11-04
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Abstract
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  • 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.
[0007] 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 to quantitatively detect 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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  • Method for testing even mixing degree of mixed iron mine pellet material
  • Method for testing even mixing degree of mixed iron mine pellet material
  • Method for testing even mixing degree of mixed iron mine pellet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The specific steps of the test method are as follows:

[0070] (1) Take one electronic scale, one funnel, one 30ml container, one scraper, one fixed bracket, and several sealed bags; the bracket fixes the funnel, the funnel must be a certain height from the experimental platform, generally 12mm, and the container is placed under the funnel , Use an electronic scale to measure the container mass m r ;

[0071] (2). Sampling is divided into sections in the mixed materials of the pellets to be tested. In order to ensure the effectiveness and reliability of the samples, the sampling area should be in the vertical powerful mixer (ie iron ore pellet mixing equipment) as a primary mixer. The interval within 10m of the material outlet is divided into 7 sampling sections of equal length, and samples are taken from each section at the same time or simultaneously, and then the samples obtained in each section are respectively sealed in the sealed bag in step (1) Among them, the number...

Embodiment 2

[0082] The specific steps of the test method are as follows:

[0083] (1) Take one electronic scale, one funnel, one 40ml container, one scraper, one fixed bracket, and several sealed bags; the bracket fixes the funnel. The funnel must be at a certain height from the experimental platform. Take 20mm and place the container under the funnel. Use an electronic scale to measure the mass of the container m r ;

[0084] (2). Sampling is divided into sections in the mixed materials of the pellets to be tested. In order to ensure the effectiveness and reliability of the samples, the sampling area should be in the vertical powerful mixer (ie iron ore pellet mixing equipment) as a primary mixer. The interval within 10m of the material outlet is divided into 10 sampling sections of equal length, and samples are taken from each section at the same time or simultaneously, and then the samples obtained in each section are respectively sealed in a sealed bag in step (1) Among them, the number o...

Embodiment 3

[0095] Sampling at time intervals. The specific steps of the test method are as follows:

[0096] (1) Take one electronic scale, one funnel, one 40ml container, one scraper, one fixed bracket, and several sealed bags; the bracket fixes the funnel. The funnel must be at a certain height from the experimental platform. Take 20mm and place the container under the funnel. Use an electronic scale to measure the mass of the container m r ;

[0097] (2) At the material outlet of the vertical powerful mixer (ie, iron ore pellet mixing equipment) as a primary mixer, take 10 samples at a time interval of 5 seconds and pack them in the sealed bag in step (1) , The number of samples is 10, and the number of samples is recorded as N=10. According to step (1) the container volume, the weight of each sample is not less than 2 times of the material in the container;

[0098] (3) From the samples taken in step (2), import them from the funnel in step (1) until the container under the funnel is fill...

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Abstract

The invention relates to a method for testing the even mixing degree of a mixed iron mine pellet material. The method comprises the steps that firstly, samples are taken in N zones within a sampling section behind a material outlet of iron mine pellet mixing equipment or samples are taken at time intervals, and the samples are numbered as 1, 2, 3, 4...N; secondly, all the samples are led into a container for weighing through a funnel, wherein the mass of the container is mr; thirdly, excess materials on the upper portion of a container opening in the step two are scraped away through a scraper, the materials in the container are made to be flush with the container opening, the mass of the container and the samples is measured as mi, wherein i=1, 2, 3...N; fourthly, the average value (please see the symbol in the specification) of the mass of the measured N samples is calculated; fifthly, the mass standard difference S of the mass mi and the average value (please see the symbol in the specification) of the mass of the measured N samples are calculated; sixthly, the obtained average value (please see the symbol in the specification) and the obtained standard difference S are used for obtaining the variable coefficient (CV) value (%) of the mass needed by the test through the formula (please see the formula in the specification).

Description

Technical field [0001] The invention relates to a method for testing the degree of mixing of iron ore pellet mixtures, in particular to raw material mixing in the field of iron ore sintered pellets, and belongs to the field of iron and steel metallurgy. Background technique [0002] In the iron and steel metallurgical industry, pelletizing and sintering are two major methods for agglomerating mineral raw materials, and also two very important agglomeration processes for man-made agglomerates from blast furnace charge. The pelleting method appeared late, but compared to the sintering method, it has advantages in environmental protection, energy saving, raw material adaptability, increased blast furnace output, and lower production costs. Therefore, the pelletizing process is gradually attracting the attention of the industry and its development speed Accelerating. Since the 21st century, major iron and steel companies have begun to build pellet production lines. Domestic pelletiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 戴波刘克俭张震戴传德
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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