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1.
提出了可以描述在各种金属离子浓度和不同的pH条件下,随铜盐添加量的增加,氰化物溶液中金属离子和CN-存在形态的公式.基于其计算结果,探讨了将铜盐加入含金银的氰化物溶液中时金银的沉淀机理,以及在矿石中铜含量较高时氰化物消耗量增加而金银浸出率降低的原因.将铜盐加入氰化物溶液中时,铜(Ⅰ)离子首先与溶液中游离CN-反应,然后从锌、镉、镍等金属的氰根配合物中"劫持"几乎全部的CN-,以CuCN形式生成沉淀,金银的氰根配合物被"劫持"CN-,以AuCN和AgCN型沉淀物沉淀. 相似文献
2.
Azoxy dyes and their copper complexes with maximum dichroism in the spectrum range from 550nm to 700nm were synthesized and used to prepare polyvinyl alcohol （PVA） polarizing films. These films showed excellent polarizing ability. In addition, a neutral gray polarizing film was prepared by mixing synthesized dichromatic dyes with other dyes. The obtained polarizable film for gray shade was little pervious to light over the visible radiation wavelength region, ranging from 400nm to 700nm at cross state, and excellent in the polarizing activities and stable to moisture and heat. 相似文献