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北美在降低磨矿费用的重大的改进之一就是推广了自磨技术。皮坎德斯玛瑟公司(Pi-ckands Mather & Go)自1957年以来就已积极地发展自磨技术。初期的研究工作导致瓦布什(Wabush)矿于1965年采用了自磨技术,安装了六台24呎直径×8呎长,1750马力的自磨机。最近于1971年完成了对另一矿山的研究工作,当该项工作取得进展时又已决定安装五台36×15呎,12000马力的自磨机。在上述两项决定期间对各种矿石应用和发展自磨技术进行了大量的研究工作。
One of the major North American improvements to reducing grinding costs is the introduction of self-grinding technology. Pi-ckands Mather & Go has been actively developing self-abrasive technology since 1957. Initial research led to the Wabush mine adopting a self-abrasive technique in 1965 and six self-mills with 24 feet by 8 feet by 1750 horsepower. The research on another mine was completed recently in 1971 and when that progress was made it was decided to install five 36,000 square foot self-mills of 36,000 feet. A great deal of research has been carried out on the application and development of self-grinding technology for various ores during the above two decisions.