Large pieces of rock are only suitable for use as road surfaces in the form of fine gravel , run - of - mine coal needs to undergo a size reduction prior to further treatment , and lumps of ore need to be crushed to small pieces because sintering plants require feed material with a high degree of fineness 公司的目标是生产破碎机和洗矿机。只有砂砾状的岩块才适合于路面，原煤必须首先要被击碎才能被加以利用，矿石必须被捣碎，这是因为烧结设备只能处理细微物料。
3.
On the basis of the statistical analysis of the annual production data of aoshan concentrator , the mathematical models for the relationship of the concentrate quality indexes ( concentration ratio , concentrate grade and recovery ) with run - of - mine ore grade and hourly throughput per unit were established and analysis of their relationship was made , which has a direct effect on guiding the concentrators production and ensuring the concontrate quality 通过对凹山选矿厂全年生产报表数据的统计分析，分别建立了精矿质量指标(选矿比、精矿品位、精矿回收率)与原矿品位、台时处理量之间的数学模型，并对其之间的相互关系作了分析，对指导凹山选矿厂生产、保证精矿质量有着直接的指导作用。
