降低宜春钽铌矿露采爆破大块率的实践与探讨

The practice on decreasing the rate of big block in the surface mining of Yichun Tantalum and Niobium Mine

针对宜春钽铌矿岩体“块体状”结构的特点 ,分析了深孔爆破大块产出率高的原因 ,通过多年的探索和生产实践 ,采用宽孔距大区排间等微差爆破技术和工艺 ,爆破效果明显改善 ,大块产出率可控制在5 %以下 。

Focus on the characteristics of rock's 'block state ' in Yichun Tantalum and Niobium Mine, the paper analyses the reasons of high big_block's rate produced in deep_hole explosion. The differential explosion technology of wide_hole distance and big row span are applied in the explosion, the productive rae of big block is controlled below 5 percent. Some problems of restricting big_block rate's decreasing are proposed.