【摘要】 概述了磁铁矿石应用磁滚筒进行预选在我国的发展，介绍了目前这一技术在磁铁矿选矿厂使用的情况，它对于能源、钢材、人力的节省无疑起到巨大作用，使企业的经济技术指标得到明显提高，获得丰厚经济效益，建议全面大力推广。更多还原

【Abstract】 This article outlines the development of preconcentration technology for magnetite ores using magnetic pulleys, describing its application at a number of magnetite concentrators in China to-day.Application of such a technology will undoubtedly play an important part in saving energy,steel materials and manpower,remarkably improving technical and economic performances of these enterprises with huge economic returns.All-round and effective popularization of the technology is proposed by the author.更多还原