Coal-blending and coke-making method involved with low G value 1/3 coking coal

Abstract

The invention discloses a coal-blending and coke-making method involved with low G value 1 / 3 coking coal. The G value of the low G value 1 / 3 coking coal is smaller than 75, the volatile component Vdaf is greater than 34%, and the coking coal of which the particle size is smaller than or equal to 6mm accounts for greater than or equal to 65wt%. The coal-blending and coke-making method comprises the following steps: 1) determining single coking coal and the weight percent thereof in blended coal; 2) controlling the moisture of the blended coal at 3-4%; 3) carrying out primary screening on the blended coal, collecting pulverized coal below the sieve, carrying out secondary screening when the blended coal on the sieve, which is crushed into particles with the particle size of smaller than 3mm, accounts for 70-75wt%, and mixing the pulverized coal below the sieve in two steps to obtain screened and mixed pulverized coal; and 4) mixing the screened and pulverized coal with the secondarily screened pulverized coal on the sieve after pressing the screened and pulverized coal into balls, charging and coking the mixture. According to the method disclosed by the invention, the preparation amount of inferior 1 / 3 coking coal is increased, the coal blending cost is reduced, and the coal-blending and coke-making method has the functions of energy conservation, emission reduction and consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of coking coal blending, and in particular relates to a coal blending coking method involving low G value 1 / 3 coking coal. Background technique [0002] According to China's coal classification standard GB / T5751-2009, the index requirement for 1 / 3 coking coal is V daf >28-37%, cohesion index G value>65, colloid layer thickness Y value≤25mm. According to the requirements of the above classification indicators, 1 / 3 coking coal can reach G value from >65 to >85 under the condition of satisfying the volatile content and Y value. Within this range, the caking properties of coking coal vary considerably, which will also have a significant impact on the quality of coke. In addition, 1 / 3 coking coal is one of the coking coals with a relatively high output of coking raw coal in my country. The rational use of 1 / 3 coking coal has a far-reaching impact on the protection of coking coal resources in my coun...

AI Technical Summary

Problems solved by technology

There are many sorting and blending technologies for 1 / 3 coking coal, but the classification indicators are different, and the blending amount is relatively low

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