Analytical method for iron ore high-temperature soft melting characteristics

Abstract

The invention relates to an analytical method for iron ore high-temperature soft melting characteristics. The analytical method is based on TG-DSC (Thermogravimetry-Differential Scanning Calorimetry) thermoanalysis technology, has simple process and accurate detection result, can effectively solve the problem of detecting the high-temperature soft melting characteristics of the iron ore, can accurately reflect the characteristic parameters such as soft melting starting temperature, final temperature and temperature range and the like of the iron ore, at the same time, can represent important information such as the amount of liquid phase as well as the relationship between the amount of liquid phase and the iron ore composition in the process of soft melting, thereby providing important basic data for process optimization in the processes of ore blending and sintering.

Description

technical field [0001] The invention belongs to iron and steel metallurgical sintering technology, and in particular relates to an analysis method for iron ore high-temperature reflow characteristics. Background technique [0002] The high-temperature reflow characteristics of iron ore are an important index to measure the difficulty of iron ore forming a liquid phase in a high-temperature environment. The low starting temperature of ore remelting indicates that the iron ore itself or the iron ore is easy to form a liquid phase under the action of flux, and the formed low-melting point substances are also many, which is conducive to improving the strength of sintered ore. [0003] Iron ore high-temperature reflow characteristics include iron ore reflow start temperature, reflow end temperature and reflow temperature range (that is, the difference between reflow end temperature and reflow start temperature), in addition to measuring the reflow difficulty of iron ore In addit...

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Problems solved by technology

[0013] The above two factors make it impossible to soften the triangular cone to a height equal to half of the bottom length when the "triangular cone method" is used to detect the reflow characteristics of iron ore, because sufficient liquid phase cannot be produced during the heating process (that is, the obtained Hemispherical temperature HT), let alone melt into a liquid or expand into a thin layer with a height of less than 1.5mm or even nearly disappear (that is, to obtain the flow temperature FT), so this method can only measure the deformation temperature DT of iron ore, and it is possible to measure The softening temperature ST of iron ore is obtained (it has not yet been reported in the literature), but the hemispherical temperature HT and flow temperature FT of iron ore cannot be obtained at all.

[0014] Second, this method cannot quantitatively measure the amount of liquid phase generated during the iron ore reflow process, and thus cannot analyze the relationship between the generated liquid phase amount and the composition of iron ore

[0015] In fact, the main purpose of the iron ore reflow characteristics test is to investigate the formation characteristics of the liquid phase in iron ore derived from gangue components (including the liquid phase formation temperature, termination temperature, formation temperature range and the amount of liquid phase formed), and The influence characteristics of gangue composition and its content on its formation, it can be seen that the existing test methods for investigating the reflow characteristics of iron ore (such as "triangular cone method") cannot meet the test requirements of iron ore reflow characteristics

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