自然界黄金的存在主要以游离的毛细金为主,那些狗头金(体积大的黄金浴称)是少之又少的,我们一般能采到的沙金矿,基本以大块金为主。即使是化验,简单的金盆淘洗化验,化验结果都是偏小的。砂金矿的采选,毛细金大部分都跑掉了,不同的矿,难选金的比例不同,数值大约在5%----75%之间,能被选到的,就更少了,为什么呢?主要是因为砂金的特性和我们所使用的方法和设备造成的。砂金有什么特性呢?自然界的砂金,密度在15---19g/立方厘米之间,相比于其他矿物,重选优势应该非常突出。但砂金单体颗粒的特性和其他矿物有很大不同,其他重矿,例如铅锌矿,即使是微粒,但它有比较结实的外形,通俗来说,就是看起来比较厚重,更接近于球形,表面积体积之比比较比较小,有很好的重选粒度特性,但砂金不一样,砂金更多的是薄皮型,有的是金石共体或镂空型,这些特性把砂金的密度优势大部分都抵消掉了,表面积体积之比非常大。 Nature gold are mainly due to the free capillary gold. The gold nugget (called a large volume of gold bath) is less and less. Generally, we can adopt the sand gold deposit, which is mainly based on the massive gold. , Even test, simple gold panning testing, test results are partial Small. Mining and selecting of sand gold mine, Mao Xijin ran away most of it, Different ore, Difficult to choose the proportion of gold is different, Value is about 5%----75% Between, can be chosen, and less, why? Mainly because of the characteristics of placer gold and our use of methods and equipment caused by The. Placer gold has what characteristic? The nature of the placer gold, density in 15---19g/ Cubic centimeters, compared to other minerals, and gravity The potential should be very prominent. But the characteristics of single particles of placer gold and other minerals are very different, such as other heavy, lead-zinc mine, even Particles, but it has a relatively strong shape, popular, that is, it looks more thick, more close to the size of the ball, the surface area ratio Relatively small compared, gravity particle size characteristics of a good, but not the same as the placer gold, placer gold more is thin, and some stone SADC or router The empty type, these characteristics put most of the placer gold density dominant offset, surface area to volume ratio is very large.
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