Research on the influence of anthracite particle size on quality of coke
The contradiction between the supply and demand of coking coal resources in China is prominent.Incorpo-rating anthracite into the coking process proves to be an effective approach for reducing production costs and expanding the utilization of coal resources.The study on the influence of anthracite particle size on coke quality can provide guidance for the technical application of anthracite in coking coal blending.By focusing on the typical 1/3 coking coal and anthracite with varying particle sizes,combined with analysis of coal quality characteristics,coking experiments were conducted using a 40 kg small coke oven.It was observed that adding anthracite can decrease the ash content,increase fixed carbon content,and enhance calorific value in coke production.Additionally,as the particle size of anthracite decreases,there is an increase in coke lumpiness with a flat surface and evenly distributed pores.When the particle size of anthracite exceeds 3 mm,coke becomes brittle and visible particles of anthracite are evident.Fur-thermore,increasing the particle size of anthracite leads to decreased coke strength,when anthracite particles is smaller than 0.5 mm in size,CSR of coke reaches 70.1%while M40 index achieves 88.4%.Moreover,when an-thracite coal is added with a particle size less than 0.5 mm,the average particle size of coke is 52.0 mm,its particle size distribution is concentrated in 40-60 mm,the granularity of this section accounts for 56.82%.When the size of anthracite is less than 3.0 mm,it can meet the operation requirements of blast furnace.The experiments demonstrate that incorporating fine-sized(＜0.5 mm)anthracites can significantly improve coke quality,this can expand coking coal resources and achieve cost reduction and efficiency improvement.
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