Method for determining sinter mixture granularity

Abstract

The invention provides a method for determining the sinter mixture granularity, which comprises the following steps of: (1) sample collection: sampling samples and determining the sample quantity; (2) sample preparation: reducing, dividing and freezing the samples; (3) screening: selecting screening equipment, determining the screening procedure, determining the screening time and carrying out screening; (4) weighing: weighing the weight of screened materials in all size grades; and (5) size grade calculation: calculating the percentage corresponding to all size grades according to a formula after the weighing completion of the samples in all size grades, recording the percentages, and calculating the average granularity. The method is characterized in that in the second step, the samples are frozen by a refrigerator after reduction and division. When the method is used, the problems that in the existing granularity determining method, the mixture size grade composition under the actual production condition cannot be objectively reflected, the mixed pelletization effect enhancing measure cannot be reasonably evaluated, and the like can be solved. The method has positive effects of effectively improving the proportioning, stabilizing the sinter process and stabilizing and improving the sinter mineral quality on sinter work procedures.

Description

technical field [0001] The invention relates to the technical field of iron ore sintering, in particular, the invention relates to a method for measuring the particle size of a sintering mixture. Background technique [0002] The mixing and granulation of sintering material is a key step in the iron ore sintering process, which belongs to wet granulation. In order to test the effect of mixing granulation, it is necessary to analyze the particle size of the sinter mixture. The existing method for determining the particle size composition of sinter mixture belongs to the dry sieve analysis method, which is formulated with reference to ISO 4701:1999 (iron ore—determination of particle size sieve). The specific measurement process is as figure 1 shown. The result obtained by this measurement method is actually the particle size composition of the sintered mixture in the dry state, not the particle size composition of the mixture under the working condition of the sintering he...

AI Technical Summary

Problems solved by technology

Therefore, the existing sinter mixture particle size measurement method has the following disadvantages: (1) The measurement process will destroy the small pellets made in the sinter mixture to form the original sinter mixture; (2) The measurement method cannot objectively reflect The particle size composition of the sintered material after granulation cannot evaluate the effect of technical measures to strengthen the mixed granulation of sintered material

[0003] In production practice, liquid nitrogen freezing and sintering mixtures are also used for particle size determination, but this method has the following disadvantages: (1) Liquid nitrogen is not easy to store, and is generally used for sporadic particle size determination, which is not suitable for daily production with higher frequency (2) There is no uniform standard or specification for measuring the particle size of the liquid nitrogen frozen sintered mixture, and the repeatability and comparability of the measurement results are poor; (3) This method needs to pour liquid nitrogen into the mixture , and then manual stirring, the stirring process is easy to damage the sintered mixture balls, and it is easy to produce large lumps due to uneven stirring; (4) because the skin contact with liquid nitrogen can cause frostbite, there is a big safety hazard when using this method , protection needs to be strengthened during the operation; (5) Due to the consumption of liquid nitrogen, the measurement cost is relatively high

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