磁黄铁矿结构性质与可浮性差异研究

磁黄铁矿主要有3个同质多象变体：六方磁黄铁矿、单斜磁黄铁矿和斜方磁黄铁矿。磁黄铁矿的化学组成、物理性质和晶体结构决定其可浮性、表面易氧化程度、性脆等特性。采用X射线衍射、电子探针和浮选试验，考察了单斜磁黄铁矿和六方磁黄铁矿的结构和成分及可浮性差异。结果表明，单斜比六方磁黄铁矿富含硫；单斜和六方磁黄铁矿浮选回收率随矿浆pH变化的规律类似，但是单斜磁黄铁矿的回收率比六方磁黄铁矿高，可浮性比六方磁黄铁矿好；酸性条件下，六方比单斜磁黄铁矿更容易被Cu²⁺活化；石灰对单斜磁黄铁矿的抑制作用不明显，而对六方磁黄铁矿具有一定的抑制作用。

Investigation on Properties and Structure of Pyrrhotite and the Difference of its Floatability

There are three main polymorphs in pyrrhotite: hexagonal pyrrhotite, monoclinic pyrrhotite and orthorhombic pyrrhotite. The chemical composition, physical properties and crystal structure of pyrrhotite determines its floatability, surface oxidation and brittleness, etc. In this paper, X-ray diffraction, electron probe analysis and flotation tests were adopted to investigate the structure, composition and floatability difference of hexagonal pyrrhotite and monoclinic pyrrhotite. The results show that monoclinic pyrrhotite is richer in sulfur than the hexagonal pyrrhotite, and the recovery variation of the two kinds of pyrrhotites with pH is similar, but the recovery of monoclinic pyrrhotite is higher and the floatability is better than that of hexagonal pyrrhotite. In the acidic condition, the hexagonal is easier to be activated by Cu²⁺ than monoclinic pyrrhotite. Lime shows a certain inhibition on hexagonal pyrrhotite, but no obvious inhibitory effect on monoclinic pyrrhotite.