我矿自1957年投产以来,矿石铜品位逐年下降。到目前为止,入选矿石铜品位下降到0.3％以下。1978年以前,生产的铜精矿品位只有10％左右,氧化镁含量高达14％。为了认真贯彻执行华主席抓纲治国的战略决策,为冶炼提供精料,在1977年羧甲纤维素提高铜精矿品位的小型试验的基础上,成功 Since the mine was put into operation in 1957, the grade of ore copper has been declining year by year. So far, the selected ore copper grade dropped below 0.3%. Before 1978, the production of copper concentrate grade is only about 10%, magnesium oxide content up to 14%. In order to conscientiously implement Chairman Hua’s strategic policy of grasping the basic state governing the country, to provide concentrate for smelting, on the basis of small trials of carboxymethyl cellulose to improve the grade of copper concentrate in 1977