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在浮选流程前头的工序里受到氧气溶蚀的磁黄铁矿-镍黄铁矿连生体表面明显地表现出双亲性。从磁黄铁矿方面来讲,它们被元素硫薄膜所覆盖,而从镍黄铁矿方面来讲,它们被亲水性氧化物薄膜或是铁的碱式硫酸盐所覆盖。被硫薄膜覆盖的富磁黄铁矿的连生体表面具有较高的浮游活性。这样的连生体浮选时被分离到精矿中,降低了精矿的铜和镍的品位。与此同时,根据固相转变机理,被溶蚀的富镍黄铁矿连生体被亲水的氧化物和铁的碱式硫酸盐薄膜所覆盖。显然,这种连生体进入分离浮选的槽内产品中,随后进入磁黄铁矿精矿中,成为抛弃的尾矿,增大了镍和铜的损失。为了增大要分离的矿物亲水性-疏水性差别,在“除垢磨”中用碱对镍黄铁矿-磁黄铁矿产品进行水化学处理,用来保证对硫化矿物进行碱作用和机械修复,以提高含磁黄铁矿的铜镍矿石的选矿指标。
The pyrrhotite-pentlandite surface exposed by oxygen in the flotation process was clearly amphiphilic. In terms of pyrrhotite, they are covered by thin film of elemental sulfur, whereas in the case of pentlandite, they are covered with hydrophilic oxide films or basic iron sulphate. The pyro-pyrrhotic congener surface covered by the sulfur thin film has higher surface activity. Such a continuous flotation was separated into concentrate, reducing the concentrate’s copper and nickel grade. At the same time, according to the solid-phase transformation mechanism, the dissolved pentlandite-rich pyrite ganglia are covered with a hydrophilic oxide and a basic sulfate film of iron. Obviously, this entangled body into the product of the separation flotation tank, and then into the pyrrhotite concentrate to become discarded tailings, increasing the loss of nickel and copper. In order to increase the hydrophilic-hydrophobic difference of the minerals to be separated, a water chemical treatment of the pentlandite-pyrrhotite product with alkali in the “Descaling mill” is used to ensure alkali action on sulfide minerals and Mechanical repair, in order to improve the beneficiation index of copper-nickel ore containing pyrrhotite.