The necessity of power coal washing
Because in the open-pit mine coal, mixed with a lot of gangue, so it can only be counted as semi-finished products, although the semi-finished products can be used, but with the development of technology for coal utilization and coal for the user requirements increase, must have corresponding to change this state, an important measure is to change the status of the development of coal preparation technology. The more perfect, more high quality of products, reduce the ash content greatly, the loss in the tailings resources. Table 6-1-2 brief list of 1978 Liaoning province coal washery, due to the different depth of washing raw coal and ash, the relationship between the two. The commodity ash washing depth choice. Although the basic characteristic depends on the raw coal and the requirements on product quality, but the total is washing depth is smaller, reducing the ash.x0d
In the coal ash, sulfur, phosphorus and other impurities are harmful, so try to get rid of the impurities, it has very important significance to improve the coal use value. Effective method is to get rid of impurities. Coal coking coal washing and processing must pass through this point, people have a more comprehensive understanding. However, with the necessity of coal washing power, is not yet widely known in large numbers.x0d
A coal is an important part of the coal industry x0d produced from coal mine or open-pit coal gangue, always contain a certain amount of. Because in the mining process, with the top and bottom rock gangue and crushed coal seam are often mixed with coal; and different thickness of coal seam with the thickness of the layer (clip in), floors, roof and floor rock properties and operation methods are different, the amplitude fluctuation of the gangue, and randomly mixed with coal, lead mine or open-pit coal ash has great fluctuation; especially with the modernization of the coal industry, coal mining, coal unit is difficult to implement rock well, can not be on the working surface of picking, will inevitably lead to decline in the quality of raw coal; in order to make full use of energy, low quality coal mining has gradually expanded. Therefore, wellhead coal is only a semi-finished products. For example, Liaoning Province Pure coal ash several opencast coal mine are low, 10.17.47%, when using a shovel mining, the average rate of coal gangue reached 24.44%, into the factory wellhead raw coal ash up to 27.10~41.9% (see table 6-1-1). In the actual production of open-pit mine, there is a part of the coal (particularly low rate generally less than 20%) of coal gangue, the gangue turned to the dump line, use a number of artificial out part of the coal. If all or most of the Department to the coal washing plant washing, is mine before the election, raw coal ash and gangue rate will far exceed the table 6-1-1 number. So I think. Used excavator bucket of open-pit coal out of coal and gangue is different than by a mixture of product sales do not have certain requirements on the quality of the coal units. So open-pit mine production of raw coal, so how well? The word rather produced from the mine coal containing There are 15~40% of the gangue, although its pure coal ash is 7~25%, but because of a large number of external ash, the original coal ash is about 13~50%.x0d
