Sintered ore quality control method in sintering process

A quality control method and sintering process technology, applied in the field of iron and steel production and processing, can solve the problems of large difference in composition, complex calculation of ingredients, and poor sampling representativeness, and achieve the effects of easy to master and operate, simple calculation method, and improved predictive ability.

Inactive Publication Date: 2014-11-26
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Description
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Problems solved by technology

For example, our factory uses a large number of "baijia mines", which have the characteristics of multiple production areas and large differences in composition between them. Although they have been treated in the first and second stockyards, the fluctuation of the mixed ore is still relatively large.
[0004] (2) The traditional sinter quality control method is to adjust the material ratio according to the chemical composition of the finished sinter. This method has a very long lag time for process quality control adjustment.
Because there are many kinds of raw fuels, and the influence of sintering cycle must be considered in the calculation, the calculation of ingredients is very complicated and error-prone; at the same time, due to the many kinds of raw fuels and the large processing capacity, the sampling representativeness of each raw fuel is poor, and the inaccuracy of individual samples will lead to calculation results Deviations occur, which in turn cause fluctuations in sinter composition

Method used

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  • Sintered ore quality control method in sintering process
  • Sintered ore quality control method in sintering process
  • Sintered ore quality control method in sintering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A. The total amount of sintering materials is 400t, including 160t total return ore, 12t fuel, 12t limestone, 7.2t dolomite, 14.4t quicklime, 194.4t mixed ore, 10t dedusting ash, 45% effective calcium content of limestone, and 45% quicklime The effective calcium content is 75%, the effective calcium content of dolomite is 35%, and the target product sinter requires R to be 2.

[0044] B. When batching, the CaO mass ratio of limestone, dolomite, and quicklime is 10:6:15, that is, if the alkalinity is adjusted, the amount of quicklime needs to be increased by 1t, and by adjusting the limestone, it needs 1.5t, and if the dolomite is adjusted, it needs to be 2.5t .

[0045] C. When batching, test the SiO of dust removal 2 content and CaO content, the test result is SiO 2 CaO content is 6%, CaO content is 10.8%, and R is 1.8, which is 0.2 lower than the requirement. Therefore, it is necessary to use flux to adjust the CaO content of dust removal ash, and it is necessary to...

Embodiment 2

[0050]A. The total amount of sintering materials is 400t, including 160t of external ore, 12t of fuel, 7.2t of dolomite, 12t of limestone, 14.4t of quicklime, 194.4t of mixed ore, and 10t of dedusting ash. The R required for the target product sinter is: 2. The effective calcium content of limestone is 50%, the effective calcium content of quicklime is 85%, and the effective calcium content of dolomite is 30%.

[0051] B. When batching, the CaO mass ratio of limestone, dolomite, and quicklime is 10:6:17, that is, if the alkalinity is adjusted, the amount of quicklime needs to be increased by 1t, while the adjustment of limestone requires 1.7t, and the adjustment of dolomite requires 2.83t .

[0052] C. When batching, test the SiO of dust removal 2 content and CaO content, the test result is SiO 2 CaO content is 6%, CaO content is 10.8%, R is 1.8, which is 0.2 lower than the requirements, so it is necessary to use flux to adjust the CaO content of dedusting ash, and it is nec...

Embodiment 3

[0057] A. The total amount of sintering materials is 400t, including 160t of external ore, 12t of fuel, 7.2t of dolomite, 12t of limestone, 14.4t of quicklime, 194.4t of mixed ore, and 10t of dust removal ash. The production requirement of sintering is 2. The effective calcium content of limestone is 55%, the effective calcium content of quicklime is 80%, and the effective calcium content of dolomite is 30%.

[0058] B. When batching, the CaO mass ratio of limestone, dolomite, and quicklime is 10:6:16, that is, if the alkalinity is adjusted, the amount of quicklime needs to be increased by 1t, and by adjusting the limestone, it needs 1.6t, and if the dolomite is adjusted, it needs 2.67t .

[0059] C. When batching, test the SiO of dust removal 2 content and CaO content, the test result is SiO 2 CaO content is 6%, CaO content is 10.8%, R is 1.8, which is 0.2 lower than the requirement, so it is necessary to use flux to adjust the CaO content of dedusting ash, and it is necess...

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Abstract

The invention discloses a sintered ore quality control method in a sintering process. The method comprises the following steps: regulating a fluxing agent ratio before sintering and in the sintering process, regulating the alkalinity of fly ash by using a fluxing agent, so that the alkalinity of the fly ash is the same as alkalinity of a target product sintered ore, controlling the amount of digestion water according to color and particle size of quick lime, and setting the cycle time of sintered internal return and blast furnace return ore; and periodically sampling and checking the alkalinity and content of SiO2 and CaO, calculating the fluxing agent ratio of subsequent ingredients needing to be increased or decreased, and adjusting the fluxing agent amount in the ingredients according to the ratio. According to the method, the influence of various ores on the sintered ore quality is greatly reduced, and the quality stability of the sintered ore is improved. Quantitative adjustment is performed through check and calculation of the components of the sintered ore, the anticipation ability of an operator is improved, the quality fluctuation tendency and amplitude are mastered, and the retardation time is greatly shortened and adjusted. Moreover, complex and troublesome ingredient calculation is simplified, and the method is easily mastered and operated by the operator.

Description

technical field [0001] Embodiments of the present invention relate to the field of iron and steel production and processing, and more specifically, embodiments of the present invention relate to a method for controlling the quality of sintered ore in a sintering process. Background technique [0002] With the further improvement of the production technology of the iron and steel industry, the utilization factor of the blast furnace can be maintained at a high level to ensure the stable production of the blast furnace and reduce the cost of molten iron, which puts forward higher requirements for the raw materials into the furnace. Among the key technical indicators of sinter, the stability of quality is the most important. At present, the following objective restrictive factors generally exist in the quality control of sintered ore: [0003] (1) Eat "Baijia Mine". In recent years, due to the continuous decline in steel prices and the high price of foreign high-quality iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 朱玉洪雷平陈红熊泽明陈少军朱强敬大宾
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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