Gannan region is a famous area of tungsten mineral production in China and even the world . With the continuous process of exploration we will face increasing problems such as the expansion of undealt mined-out area and rudimental mine props .

赣南是中国乃至世界著名的 黑钨矿产地，随开采 活动的不断进行，将 相继面临着 未 处理采空区不断增加、残留 矿柱日益增多的问题。

The rate of temperature rise by the ultrasound treatment is the same as before but at the same time the temperature of material dealt is higher than the material undealt . 6 .

超声处理前后温度上升率相同，但在同一时刻点上，处理的材料比 未 处理材料的温度 高。