secondary mill是什么意思

用法例句

Study of optimization of secondary grinding technology in Qidashan Beneficiation Plant;

齐大山选矿厂二次磨矿工艺优化研究

Analyzing the mechanism of acidulation of phosphorite in GTSP process for manufacturing calcium tri superphosphate,authors proposed to cancel the secondary ball milling in order to reduce water content in active slurry.

料浆中水分的重要来源之一是二次球磨。