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对钨矿石及钨精矿中钨的测定,常采用重量法,即在酸性介质中用盐酸喹啉将W沉淀为H_2WO_4,然后灼烧成WO_3。这是一个费时的方法,一次测定4个样品需要16个小时。 原子吸收光谱法测定W最初是为分析含W量仅为百分之几或者更低的合金及硅酸盐矿石而发展起来的。测定钨矿中高含量W的方法是B.F.Quin(1973)等提出的,R.Scobbie(1973)也作过探讨。在拟定这些方法之前,对原子吸收法与原先的重量法相结合作了尝试,但测定值常与重量法结果有明显差异。Quin和Brooks利用HNO_3+HCl溶解矿样,需要2—3
Determination of tungsten in tungsten ore and tungsten concentrates, often using the gravimetric method, that is, hydrochloric acid quinoline in acidic medium will W precipitation H_2WO_4, and then burning into WO_3. This is a time-consuming method that takes 16 hours to measure 4 samples at a time. Atomic Absorption Spectrometry W was originally developed for the analysis of alloys and silicate ores containing only a few percent or less of the W content. The method of determining W in tungsten ore is proposed by B.F. Quin (1973) et al., Also discussed by R. Scobbie (1973). Attempts to develop these methods prior to the atomic absorption method with the original gravimetric method to try, but the measured values and gravimetric results are often significantly different. Quin and Brooks use HNO_3 + HCl to dissolve the ore sample, which takes 2-3