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自60年代初以来国际金属公司安大略分公司即向井下输送同体物重量浓度为65～70％的充填料。这种方法简单可靠,但因要输送大量的水而费用高昂。被水带走的水泥和细粉还会淤积在各个中段。由于水灰比很大,留在采场内的水泥过份水化,而为了使充填料具有必要的强度,又不得不增大其中的水泥含量。此外,为了支承低浓度充填料浆的静水压力,还必须在采场内做好大量的充填前的准备工作。所有这些加上为了疏干
Since the early 1960s, the International Metal Company, Ontario Branch, has delivered downhole fillings of 65-70% by weight. This method is simple and reliable, but expensive to deliver large amounts of water. The cement and fines that are taken away by the water will also be deposited in the middle stages. Due to the large water-cement ratio, the cement remaining in the stope is excessively hydrated, and in order to provide the necessary strength to the charge, it has to increase its cement content. In addition, in order to support the hydrostatic pressure of the low-consistency filling slurry, a large amount of pre-filling preparation work must also be done in the stope. All of this plus for dryness