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黄金、白银是国家短缺的贵重金属,素有“百金之王”的之称。它不仅有明亮的金属光泽,不怕酸碱,而且还有良好的物理机械性能和很高的化学稳定性。如果把一两纯金锤成薄片,能贴满九平方米的面积;一克银可拉成一千八百米长的细丝。所以黄金白银具有多种独特和良好的性能,在生产和国防科研及人民生活等方面得到广泛应用。云南过去金银回收是个空白,不少以金
Gold, silver is a national shortage of precious metals, known as “the king of 100 gold,” said. It not only has a bright metallic luster, is not afraid of acid and alkali, but also has good physical and mechanical properties and high chemical stability. If one or two pure gold hammer into a sheet, can be covered with nine square meters of area; one gram of silver can be drawn into a thousand eight hundred meters long filament. So gold and silver with a variety of unique and good performance, in the production and national defense scientific research and people’s lives have been widely used. Gold and silver in Yunnan past recovery is a blank, many in gold