运用综合手段研究铅锌硫化物精矿的氧化和鉴定其产物

南京关口每年从国外进口铅、锌精矿达几百万吨，随着我国国民经济的发展，作为重要有色金属来源的该矿种的进口量仍将逐年增加。硫化物精矿在运输和储存过程中都有可能发生氧化，由此导致金属品位的波动是常见现象，然而此前在这方面的报导甚少。为此，作者以铅锌硫化物精矿为例对其进行了模拟状态下的氧化实验并采用能谱、光学显微镜、化学物相分析、X射线衍射分析、扫描电镜等手段对氧化前及氧化后的样品进行了鉴定。结果表明，在模拟精矿储运条件下两种精矿的氧化皆甚为明显，铅精矿为1.5%，而锌精矿达到了14.5%，由此引起的品位变化是不可忽视的。鉴于有色金属硫化物精矿在储运过程中呈现了它们的易氧化性并对品位产生影响，所以有关这类矿产品的商贸过程中涉及取样、样品加工和保管、公证等问题，均应在科学实验基础上规范化。

Study on Oxidation of Lead and Zinc Sulfide Concentrates and Identifying Its Products Using Comprehensive Methods

Millions tons of lead and zinc concentrates are imported from foreign Mines through Nanjing Port every year. With the development of our country''s national economy, the import volume of this mineral, which is an important source of non-ferrous metals, will continue to increase year by year. Sulfide concentrates may be oxidized during transportation and storage, which causes fluctuations in metal grades is a common phenomenon. However, there have been few reports on this before. Therefore, under simulated conditions the oxidation experiment of sulfide concentrates and identification of products obtained are carry out with energy spectroscopy, optical microscopy, chemical phase analysis, X-ray diffraction analysis, scanning electron microscopy and other methods by authors. The results show that the oxidation of the two concentrates is very obvious under the simulated storage and transportation conditions of the concentrate, the lead concentrate is 1.5%, and the zinc concentrate reaches 14.5%, and the resulting grade changes cannot be ignored. In view of the fact that non-ferrous metal sulfide concentrates exhibit their susceptibility to oxidation and affect their grade during storage and transportation, the commerce and trade of such mineral products involves sampling, sample processing and storage, and notarization should be standardized on the basis of scientific experiments.