Technological process selection of Xingxian coal preparation plant

ZHANG Xinlong

doi:10.13226/j.issn.1006-6772.2015.04.10

Abstract：In order to design efficient,energy-saving coal preparation process,the characteristics of No.8-2 and No.13 coal seams of Xingxian coal preparation plant were analyzed.According to the coal characteristics,the products structure of coal preparation plant were optimized.The results showed that,the overall distribution of 50 mm to 0.5 mm size fraction was uniform,and the ash content was de-creased gradually when the size fraction reduced.The gangue was not easy to degrade.The yield of low-density and high-density minerals were similar.In other words,the yield of low-density mineral was lower and the yield of high-density mineral was higher.The abnormal phenomenon made the separation of low-ash clean coal difficult to achieve.The main product of Xingxian coal preparation plant was steam coal,followed by blended coal for coking.When the mass ratio of No.8-2 coal seam to No.13 coal seam was 2 to 1,the products were ten-level clean coal,high-quality and ordinary quality steam coal.The optimum technological process was that,for 50 mm to 1.5 mm parti-cles,a pressurized two-product dense medium cyclone was conducted primary cleaning and recleaning.The 1.5 mm to 0.25 mm particles was dewatered with a centrifugal machine.The -0.25 fine slime was recovered with a pressure filter.