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坑内开采合格矿石块度尺寸,是指采、装、运允许的块度尺寸。大于合格矿石块度尺寸的矿石称为大块矿石,与总矿量的重量比为大块率。 合格矿石块度尺寸确定过小,大块率增高,二次破碎工作量大,炸药消耗量高。相反,合格矿石块度尺寸确定过大,大块率虽然很低,但过大的块度会使矿石在井下流通过程中常发生中断现象。块度尺寸大于一定数值时,相应的设备设施也加大,井巷断
Pit mining qualified block size, refers to the mining, loading, transport block size allowed. Ore larger than the size of the qualified ore is called the large ore, and the weight ratio of the total amount of ore is a large one. Piece size of qualified ore to determine the size is too small, high bulk rate, secondary crushing workload, high explosives consumption. On the contrary, the size of the qualified ore block size determination is too large, although the low bulk rate, but too large block size will make the ore flow in the process of downtime often occur. Block size is greater than a certain value, the corresponding equipment and facilities also increased, Lane broken