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本期介绍国外四篇有关旧砂在其他工业上应用文章摘要，这是９０ 年代以来旧砂从内部再生环境向外部利用发展的一个新方向，在新世纪将临，绿色铸造工程应积极开展下值得一读。
In this issue, we introduce four foreign abstracts on the use of old sand in other industries. This is a new direction for the development of used sand from the internal recycling environment to the outside since the 1990s. In the new century, the green casting project should be actively developed. It is worth reading.