某高砷锡石硫化铜矿粗粒浮选工艺研究

试验用矿石为铜锡共生多金属硫化矿,矿石中的铜以细粒嵌布为主,且与黄铁矿、毒砂等致密共生。经过粗粒浮选工艺小型试验研究,采用粗磨-混合浮选-粗精矿再磨-铜砷(硫)分离的原则流程,能获得较好的技术指标。该工艺是在一段粗磨(-74μm占40%-45%)的条件下先富集单体及连生体硫化矿物,尾矿再进行选锡作业,这样有效地保护了锡石,减轻了锡石的过粉碎,为重选提供了好的给矿条件。铜粗精矿再磨再选,尾矿进入重选选锡,减少了锡石在硫化矿中的损失,提高了精矿铜品位和回收率,降低了精矿含砷量。该新工艺最终获得产率9.38%、品位23.58%、回收率91.17%的铜精矿,其中含砷仅为0.19%。同时锡在铜精矿中的损失也不到4%。

STUDY ON COARSE FLOTATION TECHNOLOGY OF HIGH ARSENIC CONTENT CASSITERITE SULPHIDE COPPER MINERAL

The experi mented ore belongs to copper-tin polymetallic intergrowth sulphide ore. Copper in the ore is mainly fine-grained dissemination, closely associated with pyrite and arsenopyrite. Based on the small experimental research of coarse flotation technology, a principled flowsheet of primary grinding-bulk flotation-regrinding of rough concentrate-separation of Cu and As (S)was selected. It could get better technological indices. Under the condition of single-stage primary grinding (-74μm of 40%-45%), this technology preferentially enriched lock-particle sulphide minerals with tailings entering gravity concentration operation for tin separation, so it effectively protected cassiterite and lightened its overcrushing. Copper coarse concentrate was regrinded and reprocessed and tailings entered the gravity concentration, which not only reduced the loss of tin in the sulphide minerals, but also improved the grade and recovery of copper concentrate and reduced the content of arsenic in the concentrate. Coarse flotation technology finally got copper concentrate indices of yield 9.38%, copper grade 23.58% and copper recovery 91.17% in which arsenic content was merely 0.19%. The loss of tin in the sulphide copper concentrate was less than 4%.