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水厂铁矿的选矿粗碎口要求人选矿石的尺寸要小于950毫米。自1987年以来,在北区采场相继使用了斗容为19.1米~3、10米~3和16.8米~3的大型电铲装汽车出矿,随之而来的问题是大量超过标准要求的大块进人倒装站。这些大块积压在那里,严重地影响了电铲正常作业,使电铲装一个翻斗的时间由6分钟延长到十几分钟,时常造成供配矿紧张。这些大块用常规的爆破法是难以处理的,因为这些大块一般分布在距电铲5～30米的范围内,无法保证电铲在爆破中的安全,加之离倒装站不到70
Water mill iron ore beneficiation coarse crushing mouth of the size of candidate ore to be less than 950 mm. Since 1987, a large electric shovel car with a bucket capacity of 19.1 m, 3, 10 m, 3 and 16.8 m 3 has been used in the North District stope and the consequent problem is a large number of over standard requirements The block into the flip-flops. These large backlogs there, seriously affecting the normal operation of the shovel, shovel shovel to install a dump from 6 minutes to extend more than ten minutes, often lead to tight ore supply and distribution. These large blocks are difficult to handle with the conventional blasting method because these large blocks are generally distributed within a distance of 5 to 30 meters from the electric shovel and the safety of the electric shovel can not be guaranteed during the blasting and less than 70