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Metallurgical coke and method of manufacturing same

A technology of coke and coal blending, applied in the coking oven, petroleum industry, etc., can solve problems such as the method of controlling the pore structure that has not yet been known, and achieve the effects of stabilizing blast furnace operation, wide selection range, and alleviating resource constraints

Inactive Publication Date: 2017-04-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coke is a porous body with a porosity of about 50%. Although the structure of the pores is expected to affect the strength of the coke, a method for properly controlling the structure of the pores has not yet been known.

Method used

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  • Metallurgical coke and method of manufacturing same
  • Metallurgical coke and method of manufacturing same
  • Metallurgical coke and method of manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082]

[0083] In this example, in order to examine the influence of the MF and TI of the blended coal on the coke strength, for the blended coals (1-1~6), (2-1~8), ( 3-1 to 6), (4-1 to 6), and (5-1 to 5) were dry-distilled, and the properties of the coke obtained were tested. The coal filling conditions are set to 8% by mass moisture content and 750kg / m bulk density 3 The constant condition of coal crushing particle size is set to 100% below 3mm. Carbonization conditions were set to a carbonization temperature of 1050° C. and a carbonization time of 6 hours. This dry distillation test uses a small electric furnace that can simulate an actual furnace, and evaluates the properties of coke obtained by cooling under a nitrogen atmosphere after carbonization. The drum intensity DI (150 / 15). It should be noted that in some tests, the CO of coke was also measured according to the ISO18894 method. 2 Post Response Strength (CSR).

[0084]Table 2 shows the properties of the co...

Embodiment 2

[0104] By the same method as in Example 1, cokes were produced by preparing mixed coals with Giselle maximum fluidity logMF=2.2log ddpm and average maximum reflectance Ro, and the strength of the obtained cokes was examined. Tables 8 to 10 show the blending composition of each coal blend (the dry standard blending ratio (mass %) of each coal) and the results of the dry distillation test. Ro, logMF, and TI in the table are weighted averages obtained from the Ro, logMF, and TI of each product blended and the compounding ratio of each product. From Tables 8 to 10, it can be confirmed that the cases where the average reflectance Ro is 1.20%, 1.10%, and 0.95% are the same as the case where the average maximum reflectance Ro shown in Example 1 is 1.00%. Coal blending in the range of TI ≥ 3.5% by volume yields coke with high circularity of coarse pores and drum strength DI (150 / 15) of 82.7 or more. It is considered that Ro will not have a great influence on the preferred ranges of TI...

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Abstract

The subject of the invention provides metallurgical coke in which high-strength coke having a porous structure, which is not known in the prior art, can be obtained by adjusting the relationship between maximum fluidity and total inert content in a blended coal; and a method of manufacturing same. Coke is obtained by carbonizing a blended coal, which is composed of a plurality of brands of coal and exhibits properties within a total inert content range of 3.5-25.0 vol.% and a maximum fluidity (log MF) range of 1.8-2.3 log ddpm according to a Gieseler Plastometer, wherein the ratio of the total cross-sectional area of pores having a circularity of 0.8 or more among large pores having diameters of 100 [mu]m to 3 mm in the coke to the total cross-sectional area of the large pores is 10% or more.

Description

technical field [0001] The present invention relates to metallurgical coke capable of obtaining high-strength metallurgical coke by adjusting the type and blending amount of coal contained in a coal blend, and a method for producing the same. Background technique [0002] In ironmaking processes using blast furnaces, etc., coke used as a reducing material and a heat source is produced by pulverizing raw coals of various types and blending them in predetermined ratios, and charging the resulting blended coals into coke ovens , carry out dry distillation. A blast furnace can be operated stably by maintaining good air permeability in the furnace, but for this purpose, it is effective to use high-strength metallurgical coke in the furnace that is not easily pulverized. [0003] Regarding the idea of ​​basic coal blending for producing high-strength metallurgical coke, a model proposed by "Shiro" is known (Non-Patent Document 1). This model considers the constituent components ...

Claims

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Application Information

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IPC IPC(8): C10B57/04
Inventor 永山干也深田喜代志松井贵土肥勇介
Owner JFE STEEL CORP
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