西德克瑙夫石膏公司汉藤哈姆硬石膏矿于1957年建矿。建矿初期采用风动回转式凿岩机凿岩。由于许多因素,限制了风动回转冲击式凿岩技术的使用。首先,在开采价值较低的矿产时,使用压缩空气不经济。此外,硬石膏具有这样的性质,即在磨细状态下,加水会转变为石膏,并凝固起来。因此,不能采用一般的水冲洗法冲洗钻孔中的粉末。但当采用压缩空 The West Dynknow gypsum company Hane Ham Hard Gypsum Mine built in 1957. Early construction of the use of wind rotary rock drill drilling. Due to many factors, the use of pneumatic rotary rock drilling technology is limited. First, the use of compressed air is uneconomical when mining less valuable minerals. In addition, anhydrite has the property that in the ground state, the addition of water will convert to gypsum and solidify. Therefore, you can not use the general method of flushing water flushing the drilling powder. But when using compressed air