Optimization method of sintering proportioning structure

Abstract

The invention relates to an optimization method of a sintering proportioning structure, belongs to the technical field of sintering proportioning, and solves the problem that a sintering process and the quality improvement of sintering ores cannot be realized in an existing sintering proportioning mode. The optimization method is characterized by prior to determination of the dosages of iron mine powder, fusing agents and fuels in a sintering mixture, comprising the following steps: 1, drying the iron mine powder for sintering into dry basis iron mine powder; 2, uniformly mixing and splitting each dry basis iron mine powder and testing P nucleus which is the weight percent of Nuclear ore with grain size of 0.63-10mm in the dry basis iron mine powder, and P powder which is the weight percent of adhesive powder with the grain size less than 0.2mm in the dry basis iron mine powder respectively; 3, testing L powder which is the liquid phase fluidity index of the adhesive powder with the grain size less than 0.2mm in the dry iron mine powder; 4, repeatedly carrying out the steps from 1 to 3, and testing the nucleus ratio, the powder ratio and the liquid phase fluidity indexes of the second iron mine powder, the third iron mine powder,... and the ith iron mine powder; and 5, determining the proportion of the iron mine powder in the mixture according to a restriction condition. According to the optimization method, the adverse effect on the sintering process and the quality of the sintering ores caused by superfusion of the ores or the insufficiency of liquid phase quantity can be avoided, and the method is reasonable in carbon proportioning, easy to operate, high in practicability and can adapt to a diversified raw material structure.

Description

technical field [0001] The invention relates to a method for optimizing the structure of sintering ingredients, which belongs to the technical field of sintering ingredients. Background technique [0002] Sinter is the main iron-containing raw material in blast furnace production. It is a process in which iron ore powder, flux and fuel are composed of a mixture in a certain proportion, mixed with an appropriate amount of water, mixed and granulated, and then sintered on a sintering machine to form a lump. ;Because each iron ore powder used for sintering has different properties in terms of chemical composition, mineral composition, mineral type, particle size structure, etc., it is necessary to adjust the raw material structure before sintering, according to the required alkalinity, chemical composition and resource Determine the appropriate proportion of different iron ore powders, the addition of fuel and flux to meet the requirements of the blast furnace charge structure;...

AI Technical Summary

Problems solved by technology

According to the physical and chemical nature of the process link, the research on the sintering characteristics is mainly carried out from two levels: the mixed granulation process and the draft sintering process. The former process focuses on the physical process of materials at room temperature; the latter process mainly involves materials and The migration law of energy in the material layer, high-temperature chemical reaction, the interface contact behavior of metallurgical melt and solid phase, etc.; the granulation process is the link before the sintering of the mixture, which determines the air permeability and particle size distribution of the mixture, and then affects the sintering process. The quality of production and sinter plays a vital role. A lot of research has been done in this field at home and abroad, some of which focus on the prediction of the particle size distribution and air permeability of the mixture, while the other part of the research mainly focuses on the granulation process. It is difficult to apply some research results to actual production, and some are not universal; at present, in the case of frequent changes in mineral types, the focus of attention in production is more on the mineral type to the mixing material. The effect of particle size distribution, because it is related to the problem of whether it is easy to sinter

[0003] In recent years, with the popularization of the concept of high-temperature sintering characteristics of iron ore powder, the research on the sintering characteristics of iron ore powder has shifted from normal temperature to high temperature, so that the high-temperature chemical reaction of matter and energy in the material layer, metallurgical melt However, the research work on the high temperature characteristics of iron ore and its internal relationship with the sintering process is still at a low level, and this is an urgent problem to be solved in actual production The fluidity of the liquid phase is the main indicator of the high-temperature sintering characteristics of iron ore, reflecting the amount of liquid phase and the consolidation range generated during the sintering process. If the flow range is insufficient, the yield will decrease, and if the flow range is too large, the strength will decrease; It is liquid phase consolidation, so this index directly affects the quality and yield of sintered ore

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