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首页> 外文会议>Global Symposium on Recycling, Waste Treatment and Clean Technology; 20040926-29; Madrid(ES) >ELECTROCHEMICAL RECOVERY OF NICKEL FROM ELECTROPLATING EFFLUENTS BY AN 'ELECTRO-ACTIVE MIXED BED RESIN CATHODE'
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ELECTROCHEMICAL RECOVERY OF NICKEL FROM ELECTROPLATING EFFLUENTS BY AN 'ELECTRO-ACTIVE MIXED BED RESIN CATHODE'

机译：电化学混合床树脂从电镀废液中电化学回收镍

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摘要

In this paper results are presented concerning the direct electrolytic recovery of nickel from plating rinse water by using a combination of a high surface to volume ratio cathode material (fibre structure) and an ion exchange resin in contact with the fibre structure of the metal cathode and dispersed in the cathode compartment. Two types of resins have been tested on their capacity and kinetics of nickel uptake from an industrial bright nickel plating effluent containing ～ 2 g/l nickel. For an applied feed rate of 6.5 bed volumes per hour IRC 748 (Rohm & Haas) showed the a lower capacity compared to TP 207 (Bayer) but a sharper cut off profile. Elution curves of the loaded resins with 5 % sulphuric acid also yielded a sharper curve with IRC 748. As cathode material both fibrous titanium (525 g/m~2, O 35 μm) and stainless steel (300 g/m~2, O 30 μm) have been tested. It is shown that, by the introduction of IRC 748 near a fibrous titanium electrode and operating the cell at 10 A/m~2 a recovery rate of 85% can be obtained after saturation of the resin with nickel. A current efficiency of 58% was obtained when the pH of the solution was kept constant at 5.5. Although on both electrodes an adherent metallic nickel layer was obtained, it was found that the stainless steel electrode was very sensible for the generation of unwanted nickel precipitates when NaOH solution was introduced in the cell to regulate solution pH.
机译：在本文中，提出了有关通过使用高表面积与体积比的阴极材料（纤维结构）和与金属阴极的纤维结构接触的离子交换树脂的组合从电镀漂洗水中直接电解回收镍的结果。分散在阴极室中。已经对两种类型的树脂进行了测试，它们的容量和动力学是从含〜2 g / l镍的工业光亮镀镍废水中吸收镍的。对于每小时6.5床体积的应用进给速度，IRC 748（罗门哈斯公司）与TP 207（拜耳公司）相比显示出较低的处理能力，但截断轮廓却更为清晰。负载树脂在5％硫酸中的洗脱曲线在IRC 748曲线上也更清晰。作为阴极材料的纤维钛（525 g / m〜2，O 35μm）和不锈钢（300 g / m〜2，O） 30μm）已经过测试。结果表明，通过在纤维状钛电极附近引入IRC 748并以10 A / m〜2的速率操作电池，在用镍使树脂饱和后可获得85％的回收率。当溶液的pH保持恒定在5.5时，获得58％的电流效率。尽管在两个电极上均获得了附着的金属镍层，但发现将NaOH溶液引入电解槽中以调节溶液pH值时，不锈钢电极对于产生不需要的镍沉淀非常敏感。

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