论文部分内容阅读
KAu(CN)_2主要用于电镀金和化学镀金。制备KAu(CN)_2有几种方法,第一是:将小块金在王水中加热溶解,加热除去二氧化氮,使成HAuCl_4,再加NaHSO_3、KOH、KCN制备KAu(CN)_2,或者在HAuCl_4中加KOH中和到pH6,加K_2CO_3中和到pH 7.5～8使之成为KAuCl_4。然后加一定量的KCN溶液,加热使反应完全。趁热过滤,用冰水冷却滤液,即有KAu(CN)_2出现。冷却、结晶完全后离心分离,以水洗涤两次,洗去混在KAu(CN)_2中的KCl,干燥后即为成品。
KAu (CN) _2 is mainly used for electroplating gold and electroless gold plating. There are several ways to prepare KAu (CN) _2. The first is to heat and dissolve small pieces of gold in aqua regia, heat to remove the nitrogen dioxide, make HAuCl4, add NaHSO3, KOH and KCN to prepare KAu (CN) In HAuCl_4 plus KOH neutralized to pH6, plus K_2CO_3 and pH 7.5 ~ 8 to become KAuCl_4. Then add a certain amount of KCN solution, heating to complete the reaction. Filter while still hot and cool the filtrate with ice water, ie KAu (CN) _2 appears. After cooling, the crystals are completely separated, centrifuged, washed twice with water, washed off KCl mixed in KAu (CN) _2, and dried to obtain finished product.