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一.金在矿物岩石中,大多数是以自然金的形态存在于硫化物、石英脉岩或分散在砂矿中。矿物岩石中的金以极小微粒存在时,在试样中分布就比较均匀,制备的样品就具有代表性,化学分析的结果就此较准确可靠;若金的粒度较粗,在试样中的分布就很不均匀,加上金的延展特性,就很难制备出均匀的分析样品,分析结果往往不稳定。在目前的条件下,一般将较粗粒度的金经过重砂淘洗,将较细的金粒磨细到全部通过200—300目。表1是样品加工粒度对化验结果的影响。
I. Gold In mineral rocks, most of them are in the form of natural gold in sulfide, quartz vein or dispersed in the sand. When the gold in mineral rock is in the form of tiny particles, the distribution in the sample is more uniform and the prepared sample is representative. The result of chemical analysis is more accurate and reliable. If the particle size of gold is coarse, Distribution is very uneven, coupled with the extension of gold properties, it is difficult to prepare a uniform analysis of the sample, the analysis results are often unstable. Under the current conditions, the coarse grained gold is generally panned through heavy sand and the fine gold grained to all pass through 200-300 mesh. Table 1 is the effect of sample size on the test results.