硫脲溶液中金银的选择性沉淀分离

提出了一种可以从硫脲溶液中选择性沉淀金、银离子的高效沉淀剂(BAF),研究了硫脲溶液中硫脲浓度、金属阳离子初始浓度、pH值、沉淀剂添加量等因素对金属溶液中金、银及其他金属阳离子和沉淀剂阴离子沉淀率的影响.为了评价影响因素,提出了溶液中离子的沉淀率计算公式,并以沉淀剂与金、银、铜、铅、铁(Ⅱ)、铁(Ⅲ)等6种金属阳离子及硫脲的反应为例,验证了酸性溶液中由此种沉淀剂提取金银时,对其他金属阳离子的影响不大,以及所提计算公式的可靠性.

Selective Precipitation Separation of Gold and Silver from Thiourea Leaching Solution

A selective and efficient precipitant of gold,silver ions from thiourea leaching solution was proposed.And the effects of factors such as thiourea concentration,metal cation initial concentration,pH value and the additive quantity of precipitant anion on the precipitation rate of gold,silver and other metal cation and precipitant anion in thiourea leaching solution were investigated.A formula based on the sedimentation rate of ions changes in the solution with sediment formation,was used to calculate the precipitation rate.Reactions of this precipitant and metal cations such as gold,silver,copper,lead,iron(Ⅱ),iron(Ⅲ) and thiourea were used to verify little effect of other metal cations on the extraction of gold and silver of this precipitant in acidic solution and the effectiveness of this calculation formula.