Abstract
Implementation of clean mining technology at coal mines is crucial to protect the environment and maintain balance among energy resources, consumption, and ecology. After reviewing present coal clean mining technology, we introduce the technology principles and technological process of paste backfill mining in coal mines and discuss the components and features of backfill materials, the constitution of the backfill system, and the backfill process. Specific implementation of this technology and its application are analyzed for paste backfill mining in Daizhuang Coal Mine; a practical implementation shows that paste backfill mining can improve the safety and excavation rate of coal mining, which can effectively resolve surface subsidence problems caused by underground mining activities, by utilizing solid waste such as coal gangues as a resource. Therefore, paste backfill mining is an effective clean coal mining technology, which has widespread application.
Highlights
Clean mining is one kind of new production modes under strategy of sustainable development
After Environment and Development Conference of the United Nations proposed clean mining production in 1992, this type of production method has been gradually expanded within many countries and organizations in the world
The clean mining refers to applying the whole prevetion into production process and products and services, solving disadvantages of traditional end-of-pipe treatment
Summary
Clean mining is one kind of new production modes under strategy of sustainable development. Resources beyond the coal pillars can be mined and recycled This kind of method is definitely the most effective when protecting surface buildings and constructions. (2) Partly mining method: this mainly includes strip mining method, board and pillar, and mining with restricted thickness With this method, under the condition that no wave mode subsidence occurs on the ground, 40% to 60% of coal resources can be dug out when appropriate ratio of mining and reserving is used. (d) When multiple or thick coal seams are mined, coal pillars will deform and the strength will be reduced under the condition of external cause such as faults, creep effect, and mutation of tectonic stresses This will increase the emergentness of subsidence damage, resulting in caving of roof with large area. In China, clean mining production of coal resources mainly includes aspects such as mining method, coal processing, and environment control. First proposed by China University of Mining and Technology, is regarded as an important component, having been successfully implemented in the first paste backfill mining demonstration experiment
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