太原选煤厂与开滦煤炭研究所协作组成了三结合试验小组,于一九七一年八月开始对φM-2.5型浮选机进行改革试验工作,一九七二年八月十五日移交生产。一年来试验工作在选煤厂和煤研所党委的正确领导下,以批修整风为纲,认真看书学习,坚持实践第一的观点,经过一百二十多次反复试验,取得了较好 Taiyuan Coal Preparation Plant and Kailuan Coal Research Institute collaborated to form a three-pronged experimental group. In August 1971, a pilot reform of the φM-2.5 flotation machine was started. August 15, 1972 Hand over production. In the past year, under the correct leadership of the coal preparation plant and coal research institutes and party committees, pilot work has been carried out with the approval of rectification and rectification as the guideline, earnest reading studies and persistence in the practice of the first. After more than 120 trial and error tests, it has achieved relatively good results