What is secondary crushing? How to choose the location of the secondary crushing in the underground?

Unqualified large pieces produced after mining and mining are required to be crushed during the ore transportation process, which is called secondary crushing.
The cost of secondary crushing is related to the mining fee method. When the shallow hole falls, the secondary crushing cost accounts for 0% to 30% of the falling mining cost; when the deep hole falls, it is generally greater than 50%.
The ore is crushed twice. When the shallow hole falls into the mine, it is generally at the mining face and the ore gate or the vibration discharge machine. When the deep hole falls, it is generally in the secondary crushing roadway and the discharge funnel. As shown in Figure 1.
Figure 1 Schematic diagram of secondary crushing
(É‘) Use a bare drug pack to remove the funnel blockage;
(b) crushing large pieces on the vibrating ore concentrator with the earth-covering charge
1- bare drug pack; 2 - soil charge

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