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指出了原生产工艺流程存在的问题 ,介绍了对选厂碎矿、磨矿、分级、选别等作业所实施的技术改造措施和改造后的技术指标及效益情况
The problems existing in the original production process are pointed out. The technical renovation measures and the technical indexes and benefits after the alteration are introduced in the crushing, grinding, grading, sorting and other operations of the mill.