云南大屯锡粗精矿工艺矿物学研究

以云南大屯选矿厂锡粗精矿为研究对象,采用化学分析、X射线衍射分析及光学显微镜分析等手段对该粗精矿的化学组成、矿物组成、矿物嵌布粒度特征等进行了详细的研究。结果表明,锡粗精矿中有价元素锡的品位为13.80%,锡矿物主要以锡石形式产出。锡粗精矿中TFe含量为30.78%,主要以褐铁矿、磁黄铁矿的形式存在,磁黄铁矿是导致粗精矿含硫高的主要原因。锡粗精矿中主要的脉石矿物有白云石、透闪石、电气石、石英、白云母、萤石等,且脉石矿物与锡石均有不同程度的毗邻连生、包裹共生关系。本次工艺矿物学研究认为,大屯选矿厂锡粗精矿宜采用浮选预先脱硫,除去其中的硫化物,再对浮选尾矿采用重选工艺提高锡品位和回收率。该研究结果可以为大屯选矿厂工艺流程改造和合理开发利用锡资源提供科学依据。

Process mineralogical research on the rough tin concentrate in Datun, Yunnan Province

With rough tin concentrate of Datun dressing plant as the study object, the authors used chemical analysis, X-ray diffraction analysis and optical microscopy analysis to investigate chemical composition, mineral composition and mineral assemblage of rough tin concentrate. The results indicate that the grade of tin in rough concentrate is 13.80%, and tin mainly exists in the form of cassiterite. The TFe possesses 30.78% in rough tin concentrate, and mainly exists in the forms of limonite and pyrrhotite, whereas the pyrrhotite is the main factor for the high sulfur content of the rough tin concentrate. The main gangue minerals are dolomite, tremolite, tourmaline, quartz, muscovite, fluorite etc., and gangue minerals and cassiterite have complex association relationship and encapsulation relationship. According to the results of process mineralogy, the rough tin concentrate of Datun dressing plant is suitable for pre-desulfurization by flotation, which is designed to desorb the sulfide, and the gravity separation process of flotation tailings should be adopted to improve tin grade and recovery. The results of the study provide scientific basis for process modification and rational exploitation of tin resources in Datun dressing plant.