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德兴铜矿自1965年投产以来,由于矿石的铜矿物嵌布粒度较细,一段粗磨(-200目占55～60%)不易使其单体解离以及部分矿石氧化率较高,所以选矿技术指标一直很低。1977年以前,铜精矿品位为10～12%,回收率80%左右,历史最好年水平精矿品位仅有14.56%;1970年以后,南部露天采场投产,原矿含硫增高(由1～2%增至3～4%)加之硫铁矿物的可浮性极好,没有采取有效措施,导致铜精矿品位明显下降(降至8～10%),甚至常出现废品。1977年以来,矿山抓了粗精矿再磨、精选、铜硫混合精矿分离的技措工程的建设。该项工程自1978年5月建成投产,经过两年多的生产实践,精矿品位大幅度上升,经济效果显著。精矿品位由10～12%提高到22～
Since Dexing Copper Mine was put into operation in 1965, due to the finer grain size of the copper mineral embedded in the ore, it is not easy for a section of coarse grinding (55-60% of -200 mesh) to dissociate its monomer and high partial oxidation rate of ore, Therefore, mineral processing technology has been very low. Before 1977, the grade of copper concentrates was 10-12% and the recovery rate was about 80%. The best annual level concentrate concentration was only 14.56%. After 1970, the southern open pit was put into operation and the sulfur content in the ore increased ~ 2% to 3 ~ 4%). In addition, the flotability of pyrite is excellent and no effective measures have been taken. As a result, the grade of copper concentrates has dropped significantly (down to 8-10%), and waste products often appear. Since 1977, the mine has scratched the construction of technical measures for the re-grinding of crude concentrates, selection and separation of copper-sulfur mixed concentrates. The project was completed and put into production in May 1978, after more than two years of production practice, concentrate grade increased significantly, with significant economic results. Concentrate grade increased from 10 to 12% to 22 ~