甘肃铜镍硫化物矿床金铂钯相态分析

Phase Analysis for Gansu Cu-Ni Sulfide Deposits of Gold, Platinum and Palladium

通过研究甘肃铜镍硫化物型矿床的矿物组成,用物理与化学相结合的方法进行矿物分离,将铜镍硫化矿物中金、铂、钯的赋存状态划分为磁性部分(磁黄铁矿相、磁铁矿相、独立矿物相)和非磁性部分(硫化矿相、脉石中类质同象相、独立矿物相)共6个相态。研究确定了各相态的提取剂及提取条件,用ICP-MS测定各相态中金、铂、钯的含量,从而查明其分布情况。各元素的各相态提取之和与样品各元素的总量之比,Au为105%～112%、Pt为92.5%～108%、Pd为110%～114%,其分布与磁性选择结果及岩矿鉴定矿物组分分布基本一致。方法具有较好的准确性和重现性,研究结果为寻找隐伏矿提供理论依据,并可在选矿工艺研究中发挥作用。

With the combination of physical and chemical methods, by analysing the composition in mineral, the occurrence states of gold, platinum and palladium in minerals of Gansu Cu-Ni sulfide deposit were separated into the magnetic part （pyrrhotite phase, magnetite phase, independent mineral phase） and non-magnetic part （phase of sulfide ore, gangue of isomorphous phase, independent mineral phase）, a total of 6 phases. After establishing the extraction agent and conditions, a method was adopted by using ICP-MS to determine content of gold, platinum and palladium in each phase, and their distributions in each phase were identified. The distributions agree with the magnetic selection results and mineral identification. The ratio that the extracted aggregates of each element in each stage and their total contents of each element： Au from 105% to 112%, Pt 92.5% to 108%, Pd 110% to 114%, showing that the method has good accuracy and reproducibility. The method provides a theoretical basis for locating concealed ore, and can play an effective role in the study of beneficiation process.