Method for judging pelletizing performance of powdered iron ores

Abstract

A method for judging pelletizing performance of powdered iron ores includes: taking no less than 800g of the powdered iron ores and drying; sieving; determining the maximum molecular water a of the powdered iron ores with the particle size <1mm in a centrifugation method; determining the maximum capillary water b of the powdered iron ores with the particle size <1mm in a saturated water absorptionmethod; determining the total pore volume vm; calculating the pelletizing performance index of the powdered iron ores with the particle size <1mm according to the formula K=A / (B-A); determining the pelletizing performance of the powdered iron ores with the particle size <1mm according to K, that is, when K<0.2, no pelletizing performance is achieved; when<=0.2<=K<0.35, the pelletizing performanceis weak; when 0.35<=K<0.60, the pelletizing performance is common; when 0.60<=K<=0.80, the pelletizing performance is good; when K>0.8, the pelletizing performance is excellent. By means of the method, the pelletizing performance of the powdered iron ores can be accurately evaluated, the evaluation method is simple and easy and high in operability, and the on-site production can be better guided.

Description

technical field [0001] The invention relates to a method for judging the working conditions of sintering technology, which exactly belongs to the method for judging the spheroidizing performance of iron powder ore. Background technique [0002] The spheroidity of iron ore powder is directly related to the granulation performance, which affects the distribution of different mineral particles, thus affecting the sintering process or pellet production process. After searching, the literature "A method for detecting the spheroidizing ability of iron concentrate" and the literature "An instrument for measuring the spheroidizing index of iron ore powder" pointed out that the spheroidizing index K is often used to accurately measure the spheroidizing ability of iron ore powder. : K=a / (b-a), where a is the largest molecular water (%); b is the largest capillary water (%). Since the above empirical formula only involves the determination of the maximum molecular water and maximum ca...

AI Technical Summary

Problems solved by technology

For coarse iron ore powder, the specific surface area is small, and the proportion of the pore surface area inside the particle is relatively large. However, the adsorbed water on the surface of the pore inside the particle has no effect on the granulation of the particle. If the molecular water adsorbed by the pores inside the particle is not excluded and capillary water, which cannot truly reflect the molecular water and capillary water that iron powder ore plays a role in granulation

[0003] At the same time, the experimental research on the internal pore size of iron ore powder has been carried out, and it has been found that the internal pore size distribution of the iron ore powder can be ball-sized particles is mainly distributed between 2-1000nm, which is far smaller than the thickness of the iron ore adsorption molecular water film, and the pores The water adsorbed in the iron ore cannot truly reflect the ability of the iron ore surface to adsorb molecular water and capillary water.

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