The nature and classification of coal gangue?The classification and properties of coal gangue for writing papers
(4) hand dressing mixed output in the coal mine, coal preparation plant in the ground or by manual sorting of coal gangue is called hand hand dressing. Dressing has a certain size, the displacement is less, mainly from the coal gangue, has a certain calorific value, were associated with the coal mining industry often together are picked out.(5) coal gangue stripping in open-pit mining, coal bearing strata being stripped from the rock, collectively referred to as stripping. The utility model is characterized in containing waste rock complex types, the carbon content is very low, generally no calorific value, at present is mainly used to backfill mined out area or filling reclamation, some stripping waste also containing minerals.(6) also known as spontaneous combustion of gangue spontaneous combustion of gangue burned gangue, refers to the accumulation in the coal gangue after natural coal gangue after. This kind of waste (slag) of original rock in the siltstone, mudstone and carbonaceous mudstone are removed after the spontaneous combustion gangue in some or all of the carbon, its loss is low, chemical the color and the coal gangue in the rock composition, with volcano activity and chemical activity.
1, according to the sources classification according to the coal gangue output that can be divided into the source of coal gangue gangue, gangue, coal roadway rock gangue, gangue gangue and stripping hand selected, some of the coal gangue as a source according to the classification of(1) the gangue discharged from the raw coal washing process is called the washing waste. The concentration of the washing waste is concentrated, the grain size is fine, the calorific value is higher, the clay mineral content is high, the content of carbon, sulfur and iron is generally higher than other kinds of gangue(2) coal gangue in the coal mine roadway tunneling process, all along the seam mining, excavation engineering from coal gangue, coal gangue, coal roadway called Xiang Gan is mainly composed of mining coal seam roof and floor rock, interlayer composition, carbon content and calorific value often containing certain, sometimes containing CO with mineral resources.(3) the waste rock roadway in coal mine construction and rock tunnel excavation process, all along the seam tunnelling emissions produced by coal gangue, gangue rock roadway rock roadway. Collectively, gangue containing rock complex types, discharge is more concentrated, its low carbon or carbon, so no calorific value.
On the classification of coal gangue named, at home and abroad there is no systematic and complete and unified solutions are different based on certain characteristics put forward its own classification criteria. And the classification scheme of coal gangue, one of the most simple, the most commonly used is classified by coal gangue coal production department used areas. Use color to classification and nomenclature, such as black and white ash gangue gangue, coal gangue, coal gangue or red; according to the output layer to classification and nomenclature, such as roof, stone coal gangue. According to the classification of coal gangue are common sources according to the classification, according to the natural state of being classified according to the classification and utilization of classification method.
Classification of coal gangueClassification and nomenclature of coal gangue is not only the basis of comprehensive utilization of coal gangue, but also a comprehensive strong work. Around the coal gangue complex composition, physical and chemical properties of different chemical compositions and physical and chemical characteristics for comprehensive utilization of coal gangue in different ways of coal gangue are not the same. The classification of science and reasonable for coal gangue has very important theoretical and practical significance to promote coal gangue resource utilization, mainly reflected in the maximum heap of coal gangue, coal gangue to make classified piled up, in order to explore the high added value utilization of coal gangue technique and its long-term development to provide evidence for making decisions based on utilization.
