关键词: 铜矿石, 艾砂磨机, 粗精矿再磨, 工业试验, 经济效益

Abstract: The Cu grade of a certain copper mine in Heilongjiang Province is 0.38%， associated by valuable metals such as gold， silver and molybdenum. In the case of the original processing grinding fineness is -74 μm accounted for 66%， via the flotation process， copper concentrates containing 18.97% Cu， 25% SiO₂ and 6.25% Al₂O₃， the content of Si and Al in the copper concentrate exceeded the standard and affecting the sale price coefficient. In order to improve the quality of copper concentrates and reduce the content of impurities， laboratory tests and industrial tests of ALC mill were carried out. The results show that under the conditions of the same process and flotation agent system， after the ALC mill is applied to regrind of copper rough concentrate， by small closed circuit experiment can obtain copper concentrates containing 30.68% Cu， 10.24% SiO₂， and 1.96% Al₂O₃. In the industrial test， when the regrinding fineness P80 was 25 μm of rough concentrate， copper concentrate containing 27.63% Cu， 10.34% SiO₂， and 1.87% Al₂O₃. The application of ALC mill has effectively improved the quality of copper concentrates， reduced the transportation cost of concentrates， increased the added value of products， and significantly increased economic benefits.

Key words: Copper ore, ALC mill, Rough concentrate regrinding, Industrial test, Economic benefits