块煤、小颗粒煤测定视相对密度结果影响分析

Result Impact Analysis of Lump Coal and Granular Coal in Apparent Relative Density Measurement

煤的视相对密度是煤炭资源储量估算的一个重要参数。影响煤的视相对密度因素很多，其中煤样粒度对煤的视相对密度结果影响大。根据块煤和小颗粒煤测定煤的视相对密度结果分析，认为小颗粒煤测定煤的视相对密度结果重复性好，而块煤重复性较差，块煤测定视相对密度结果值普遍小于小颗粒煤，建议采用小颗粒煤行标法；对于某些煤样过于破碎或易泥化，取不到具有代表意义的3-6mm粒级的煤样，或出现真密度小于视密度的现象时，可利用真相对密度值或实测视密度样之灰分值进行换算处理，提供一个合适的视密度值来进行煤炭储量的估算，使煤炭储量估算值更接近于真值。

The apparent relative density of coal is a major parameter in coal resources estimation. Many factors impact apparent relative density measurement, while the granularity of coal sample has larger impact on the result. Based on analysis of results from lump coal and granular coal, considered that results from granular coal have good repetitiveness, while from lump coal poorer, generally less than from granular coal. Thus measuring method from granular coal industry standard is proposed. For some coal samples excessively cracked or east to degradation in water can take 3-6mm sized coal sample with representative significance. If true density less than apparent density appearing, carry out conversion of true relative density value or measured apparent density sample ash content value, provide an appropriate apparent density value as possible to estimate coal reserves, making the estimation closer to the true value.