回砂【road improvement】指的是用回砂设备对路面松散保护层恢复平整的作业。
混砂时如果型砂的含水量较低，更回显得相当干散和硬脆。
If the moisture content of molding sand with low sand, more very dry bulk and hard brittle.
经实践证明：回用的金属砂能满足生产要求，降低了生产成本。
The practice shows that recycled metal sand filter can meet requirements of production and reduce production cost.
解决了旧砂回用问题，具有显著的经济效益及社会效益。
It has solved the problem of reclamation of return sand, and it has remarkable economic as well as society benefits.
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