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对大峪口磷矿联动试车中美国ＡＬＬＩＳ公司球磨分级系统出现的各种过障进行了分析，提出了改进方案，实施后控制效果良好，取得了较好的经济效益。
The analysis of various obstacles occurred in the milling classification system of ALLIS Company in Dayukou Phosphorus Mine linkage test was carried out, and the improvement scheme was put forward. After the implementation, the control effect was good and good economic benefits were obtained.