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有关岩石试样中铜锌物相分析,国内外已有许多研究,确定了不少常规分析流程。其中氧化铜与硫化铜的分离方法有H_2SO_(4~-)Na_2SO_3法、乙二胺法、(NH_4)_2CO_(3~-)NH_4OH法、HAc-Na_2SO_3法等。经作者试验,上述方法应用于含铜、铅、锌等元素的多金属黄铁矿试样,特别是含有较多活性硫化物(辉铜矿、斑铜矿、磁黄铁矿等)的试样时存在一定的问题。当用含有铵盐的试剂浸取氧化铜时,由于辉铜矿及斑铜矿的部分被浸取,使氧化铜的结果严重偏高;若采用H_2SO_4—Na_2SO_3酸法浸取时,则因各种共存活性硫化物的电化作用,使氧化铜的结果也徧高,在强酸介质中,由于会发生Cu~(2+)+ZnS(PbS)(?)CuS↓+Zn~(2+)的反应,使结果偏低。为克服上述问题,本文提出用50毫升15％乙酸-1毫升饱和氯化汞-1.2克无水
There are many researches on the phase analysis of copper and zinc in rock samples and many routine analytical procedures have been established. Among them, the separation methods of copper oxide and copper sulfide are H_2SO_ (4 ~) Na_2SO_3 method, ethylenediamine method, (NH_4) _2CO_ (3 ~) NH_4OH method and HAc-Na_2SO_3 method. The authors test, the above method is applied to copper, lead, zinc and other elements of the polymetallic pyrite samples, in particular, contains more active sulfide (chalcopyrite, bornite, pyrrhotite, etc.) of the test There are some problems when the sample. When copper oxide is leached with an ammonium salt-containing reagent, the result of copper oxide is seriously elevated due to the leaching of part of chalcopyrite and bornite, and when the acid is leached by H 2 SO 4 -Na 2 SO 3, The coexistence of active sulfide electrochemistry, so that the result of copper oxide is too high, in a strong acid medium, due to occur Cu ~ (2 +) + ZnS (PbS) (?) CuS ↓ + Zn ~ Reaction, the result is low. To overcome the above problems, this paper proposes using 50 ml of 15% acetic acid - 1 ml of saturated mercuric chloride - 1.2 g of anhydrous