Comprehensive Technical Support for High-Quality Anthracite Production: A Case Study in the Xinqiao Coal Mine, Yongxia Mining Area, China

Abstract

The effective production of high-quality anthracite has attracted increasing global attention. Based on the coal occurrence in Yongxia Mining Area and mining conditions of a coalface in Xinqiao Coal Mine, we proposed a systematic study on the technical support for the production of high-quality anthracite. Six key steps were explored, including coal falling at the coalface, transport, underground bunker storage, main shaft hoisting, coal preparation on the ground, and railway wagon loading. The study resulted in optimized running parameters for the shearers, and the rotating patterns of the shearer drums was altered (one-way cutting was employed). Mining height and roof supporting intensity were reduced. Besides, loose presplitting millisecond blasting and mechanized mining were applied to upgrade the coal quantity and the lump coal production rate. Additionally, the coalface end transloading, coalface crush, transport systems, underground storage, and main shaft skip unloading processes were improved, and fragmentation-prevention techniques were used in the washing and railway wagon loading processes. As a result, the lump coal production rate was maintained at a high level and fragmentation was significantly reduced. Because of using the parameters and techniques determined in this research, high-quality coal production and increased profits were achieved. The research results could provide theoretical guidance and methodology for other anthracite production bases.

Thermodynamic properties and explosion energy analysis of carbon dioxide blasting systems

“…Due to the rapid development of coal mining technologies and fully mechanised mining machines, the Cardox system is rarely used today in coal mining. Over the past twenty years, with increasing concerns about coal mining safety and chemical explosives control, the advantages of the Cardox system have raised its applicability in some coal mines for improving coal seam gas drainage (Zou and Panawalage 2001;Pantovic et al 2002;Vidanovic et al 2011;Zhang et al 2015).…”

Archives of Metallurgy and Materials

“…of carbon filler to thermoplastic materials inhibits expansion of the stream related to the Barus effect. Growth in the abrasion resistance of the cast polymer graded composites with an epoxy resin matrix with added powdered ortho-coking coal and anthracite dust was also observed [14][15][16][17].…”

Positive Phase Pressure Function and Pressure Attenuation Characteristic of a Liquid Carbon Dioxide Blasting System

“…Due to the rapid development of coal mining technologies and fully mechanized mining machines, the Cardox system is rarely used today in coal mining [6]. Over the past twenty years, with the coal mining safety concern and chemical explosives control, the advantages of the Cardox system is exposed again in some coal mines [7][8][9][10], urban construction projects [11], frozen soil blasting [12], rock breaking, and concrete demolition blasting under a special circumstances [13][14][15].…”

“…The chemical energizer is activated by a small electrical charge which causes the blasting. mines [7][8][9][10], urban construction projects [11], frozen soil blasting [12], rock breaking, and concrete demolition blasting under a special circumstances [13][14][15].…”