Method for correcting test deviation of relative reduction rate of pellet

Abstract

The invention discloses a method for correcting a test deviation of a relative reduction rate of pellet. The method is characterized by installing Matlab software on a computer, correcting the final reduction rate of a reduction signal at the end of the reduction test by using Daubechies wavelet in the Matlab software, separating noise of the reduction signal from the original signal, eliminating the noise in the original signal of the reduction signal in the presence of external interference, decomposing the mixed signal to different frequencies of block signals, reducing the sawtooth reduction signal to give a smooth curve, and obtaining the reduction rate the same with that of the original noise-free reduction signal curve. The method has the advantages that the noise of the pellet reduction curve is reduce conveniently by using the Daubechies wavelet combined with a GUI function of a Matlab wavelet analytical tool box, to achieve result correction. By correcting the reduction curve via the method, the detection time can be shortened by at least 16h (i.e. half time of retest), and the material cost can be saved by at least 1800 rmb in each test at the same time.

Description

technical field [0001] The invention relates to a method for testing the relative reduction rate of pellets, in particular to a method for correcting the test deviation of the relative reduction rate of pellets. Background technique [0002] The relative reduction rate of pellets is an important item in the metallurgical performance test of iron ore. The main standard of the test for this project is "ISO7215 Blast Furnace Raw Material Iron Ore - Determination of Reduction Rate by Final Degree of Reduction Index". The latest version of this standard is In the 2007 edition, the standard principle is to carry out isothermal reduction with carbon monoxide at 900°C for 3 hours, heating and cooling under an atmosphere of inert gas, so as to investigate the degree of removal of iron-bound oxygen in pellets with reducing gas. [0003] The general reduction curve of relative reduction rate of pellets is a smooth curve, but this curve will also make the reduction curve of pellets toot...

AI Technical Summary

Problems solved by technology

[0003] The general reduction curve of relative reduction rate of pellets is a smooth curve, but this curve will also make the reduction curve of pellets tooth-shaped due to various external disturbances ( figure 1 ), a kind of noise similar to the equipment, that is, the original normal reduction curve is added with white noise. At this time, the deviation of the relative reduction rate can reach 3-5%, which affects the test accuracy.

In the past, when encountering this situation, the sample needs to be re-tested, resulting in waste and loss of time, testing cycle, and test materials.

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