降低坚硬贵重矿石爆破法开采粉矿产出率的实验探讨

通过混凝土模型的爆破破碎实验，探讨了矿岩介质的波阻抗及柱状药包结构的变化对粉矿产出率的影响。结果表明，采用相同的药包爆破破碎不同波阻抗值的介质时，随着小阻抗值的增大，粉矿产出率随之明显上升；而当采用不同结构的药包爆破破碎相同的介质时，中空药包爆破破碎后的粉矿产出率，明显氏于实心药包爆破产生的对应值。作者分析了影响粉矿产出率变化的原因，并认为采用柱状中空药包爆破破碎坚硬的原生贵重矿石，可能会明显降低

Experimental investigation on reducing fine productivity of mining precious ores by blasting

To investigate into the effect of the change in both acoustic impedance of ore like medium and the structure of cylindric charges on fine productivity,a test on fragmentation by blasting was conducted in concrete models.As the different media with different impedance were separately broken by the explosion of the same charge,the fine productivity rose clearly with the increase in impedance of the medium.As the charges with different structures were separately used to break the same medium,by comparison,the fine productivity from the explosion of the solid charge,is greater than that from the explosion of the charge with an axial cavity.Authors analysized the factors resulting in the change in fine producivity ,and pointed out that hard precious ores broken by the explosion of the charge with an axial cavity would make fine productivity decreased. As a result ,recovery rate might rise clearly.