在开采非金属矿的爆破中,如炮眼内装药量过多,不但容易发生事故,而且会使非金属矿晶体遭到破坏.采用松动爆破,一方面可大大节约炸药和劳动力,另一方面还可减少晶体破坏.这里将适于松动爆破的岩石硬度,炮眼的直径、深度和方向,最小抵抗线的大小,自由面的多少,使用炸药种类,爆破作用指数和装药量等条件介绍于下: 1.岩石硬度.普氏硬度系数为9～11的岩石适宜 In the blasting of non-metallic mines, if there are too many charges in the blasthole, it will not only be prone to accidents, but will also damage the non-metallic ore crystals. Using loose blasting can save explosives and labor on the one hand, and on the other Can reduce the crystal damage. Here will be suitable for loose blasting rock hardness, blasthole diameter, depth and direction, the size of the minimum resistance line, the number of free surfaces, the use of explosives, blasting index and charge volume and other conditions introduced in the next : 1. Rock hardness. Suitable for rocks with a Platts hardness coefficient of 9 to 11