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首页> 外文会议>EPD congress;TMS annual meeting exhibition >RECYCLING OF VALUABLE METALS FROM POLY CRACKER ASH OF PRINTED CIRCUIT BOARDS (PCBS) BY PHYSICAL BENEFICIATION AND HYDROMETALLURGICAL TREATMENT
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RECYCLING OF VALUABLE METALS FROM POLY CRACKER ASH OF PRINTED CIRCUIT BOARDS (PCBS) BY PHYSICAL BENEFICIATION AND HYDROMETALLURGICAL TREATMENT

机译：通过物理增生和水凝胶处理从印刷电路板（PCB）的多聚裂纹灰中回收有价值的金属

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摘要

In the present paper, recovery of valuable metals from the poly-cracked ash obtained by pyrolysis of discarded PCBs has been studied following physical beneficiation and a hydrometallurgical process alternate to smelting. The ash is subjected to comminution for the separation of metallic components from non-metallic fractions by scrubbing, tabling and froth flotation which enriched the metal in the concentrate ～97% which was further screened to separate high and low metal concentrate. The finer fraction containing ～12% metallic value was leached in acidic solution. Almost all (Cu, Pb, Fe, etc) were leached in 4M HNO_3 at 90°C in 75 min at a pulp density 100 g/L. The characterization of both ash and residues were made by XRD, EPMA, EDS, etc. to validate the experimental results. The metals from the leach liquor could be recovered/separated using solvent extraction techniques which can further be processed to get pure metal salts/ sheets.
机译：在本文中，已经对通过物理选矿和湿法冶金工艺替代冶炼后的废弃PCB进行热解而获得的多裂化灰分中的有价金属的回收进行了研究。将灰分进行粉碎，通过擦洗，制板和泡沫浮选法将金属成分与非金属成分分离，从而使精矿中的金属富集约97％，并进一步进行筛分以分离出高，低金属精矿。在酸性溶液中浸出的金属含量约为〜12％的较细级分。几乎所有成分（Cu，Pb，Fe等）在90°C下于75分钟内浸入4M HNO_3中，纸浆密度为100 g / L。通过XRD，EPMA，EDS等对灰分和残渣进行表征，以验证实验结果。可以使用溶剂萃取技术从浸出液中回收/分离金属，可以进一步对其进行处理以获得纯金属盐/片。

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