直接一步法从废瓶胆回收白银

从废瓶胆回收白银,过去的方法如下:先用硝酸将废瓶胆上的银转化为硝酸银而溶解。继用氯化钠将硝酸银中的银转变为氯化银而沉淀。然后在酸性溶液小用金属铁将氯化银中的银还原为粗银粉。最后将粗银粉置坩埚中拌和碳酸钠与硼砂的混合粉灼烧得白银。直接一步法从废瓶胆回收白银显著不同于过去的方法之处,在于使用了一种特殊溶液,称为银的脱落液,废瓶胆上的银即直接脱落,然后按常法灼烧得白银。此法具有如下优点:设备简单,操作容易,低成本,低消耗,省时间省劳力,无腐蚀无毒性,不污染环境。

Direct Recovery of Metallic Silver from Abandoned Thermosbottles by One-Step Method

The conventional method to recover metallic silver from the abandoned thermosbottles is as follows; first, converting the silver from the abandoned thermosbottles into silver nitrate by dissolving it in nitric acid solution; secondly, Precipitating the silver from silver nitrate as silver chloride by the addition of sodium chloride; thirdly, reducing the silver from silver chloride to silver sludge by means of metallic iron in the Presence of acid soluion; finally, smelting the silver sludge in a clay porcelain crucible with the mixture of sodium carbonate and borax to obtain metallic silver, One -step method to directly recover metallic silver from abandoned thermosbottles is to use a special solution to divorce the silver fiom abandoned ther mosbottles and then smelt the silver sludge to obtain metallic silver in the regular way, This method has sllch advantagesas less equipment, simple Process, less waste, low cost, no erosion, no Pollution.