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首页> 外文会议>32nd Annual Hydrometallurgy Meeting and International Conference on the Practice and Theory of Chloride/Metal Interaction, Vol.2, Oct 19-23, 2002, Montreal, Quebec, Canada >Metal Recovery from Electronic Scrap by Leaching and Electrowinning
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Metal Recovery from Electronic Scrap by Leaching and Electrowinning

机译：通过浸出和电解沉积从电子废料中回收金属

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摘要

A novel aqueous leach-electrowin process is outlined for recovering Ag, Au, Cu, Pb, Pd, Sn, etc. from electronic scrap. This involves using a range of oxidants, generated anodically and sequentially as the leaching progresses from the more active metals to the precious metals, which require chlorine for their dissolution in 5 M aqueous chloride media of pH circa zero. Thermodynamic calculations of the solubility of Cl_2 (aq)+Cl_3~-indicated the benefits of operating with free chloride activities greater than unity, at which Cl_3~- ions form, increasing activities / concentrations to circa 100 mol m~(-3) at 298 K and P(Cl_2) = 1 atm. Sn(Ⅳ) / SnO_2, Ag(Ⅰ) / AgCl and Pb(Ⅱ) / PbCl_2 were all predicted to have low solubilities, requiring high (> 1 M) free chloride concentrations, and pH < 0 in the case of SnO_2, to achieve adequate concentrations for leaching and electrowinning. UV absorption spectrophotometry is shown to be a potentially useful technique for online determination of both chlorine and heavy metal species, though spectral deconvolution is required to decouple their contributions, and concentrations may need to be low for practically achievable optical path lengths in on-line flow-through cells. From the concentration depletion behaviour of dissolved copper, tin, silver and palladium, their simultaneous electrowinning at a Ti mesh cathode was shown to be feasible at mass transport controlled rates.
机译：概述了一种新颖的水浸电沉积工艺，用于从电子废料中回收Ag，Au，Cu，Pb，Pd，Sn等。这涉及使用一系列的氧化剂，随着浸出过程从更具活性的金属向贵金属的转移，阳极和顺序地会产生这些氧化剂，这需要氯气才能将其溶解在pH值约为零的5 M氯化物水溶液中。 Cl_2（aq）+ Cl_3〜的溶解度的热力学计算表明，在游离氯活性大于1的条件下操作的好处是，Cl_3〜-离子形成时，其活性/浓度增加到大约100 mol m〜（-3）。 298 K，P（Cl_2）= 1 atm。预测Sn（Ⅳ）/ SnO_2，Ag（Ⅰ）/ AgCl和Pb（Ⅱ）/ PbCl_2的溶解度低，需要高浓度（> 1 M）的游离氯化物，而SnO_2的pH值<0。达到足够的浓度以进行浸出和电积。紫外吸收分光光度法被证明是在线测定氯和重金属物质的一种潜在有用技术，尽管需要光谱去卷积来分离它们的作用，并且对于在线流中实际可达到的光程长度，可能需要降低浓度通过细胞。从溶解的铜，锡，银和钯的浓度耗尽行为来看，在质量转移控制的速率下，在Ti网状阴极上同时进行电解沉积是可行的。

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