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首页> 外文会议>Conference of Metallurgists >A NOVEL SEPARATION PROCESS FOR DETOXIFYING CADMIUM-CONTAINING RESIDUES FROM ZINC PURIFICATION PLANTS
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A NOVEL SEPARATION PROCESS FOR DETOXIFYING CADMIUM-CONTAINING RESIDUES FROM ZINC PURIFICATION PLANTS

机译：一种新的分离过程，用于从锌净化植物中解毒含镉残基的分离方法

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A novel separation process for detoxifying cadmium-containing residues arising from zinc hydrometallurgical processes has been developed. An initial investigation indicated that a high concentration of zinc in the sulfate solution can be effectively separated from cadmium by solvent extraction with P204 (di(2-ethylhexly)phosphoric acid, D2EHPA). The mixture of sulfuric acid and ammonium citrate ((NH_4)_3C_6H_5O_7) is thus used to extract metals from the residue at room temperature. Copper in the leachate is recovered by solvent extraction (SX) with LIX 973. Cobalt in the raffinate from the copper SX process is recovered by precipitation with α-nitroso-β-naphthol. The results show that more than 50% of the copper and virtually all the zinc, cadmium and cobalt in the residue can be leached under the experimental conditions used here. Virtually all dissolved copper and cobalt can be recovered in the subsequent solvent extraction and precipitation processes. The presence of (NH_4)_3C_6H_5O_7 could significantly facilitate the extraction of zinc by D2EHPA in the subsequent separation of zinc and cadmium. More than 97% of the dissolved zinc can be recovered through a two-stage counter current solvent extraction process. After separating copper, cobalt and zinc, cadmium can easily be recovered from the solution either by cementation with zinc powder or by electrowinning, while the purified solution can be recycled back to the leaching process.
机译：已经开发出一种新的分离方法，用于解毒含锌氢冶金工艺中产生的含镉的残基。初步研究表明，通过用P204（二（2-乙基己基）磷酸，D2ehPA），可以通过溶剂萃取有效地将硫酸盐溶液中的锌浓度与镉分离出来。因此，硫酸和柠檬酸铵（（NH_4）_3C_6H_5O_7）的混合物用于在室温下从残余物中萃取金属。渗滤液中的铜通过溶剂973回收溶剂萃取（Sx）。通过用α-硝基-β-萘酚沉淀回收来自铜Sx工艺的汽油中的钴。结果表明，在此处使用的实验条件下，铜和几乎所有锌，镉和钴都可以浸出50％以上的铜，几乎所有锌，镉和钴。几乎可以在随后的溶剂萃取和沉淀过程中回收所有溶解的铜和钴。 （NH_4）_3C_6H_5O_7的存在可以在随后的锌和镉分离中，显着促进D2ehPa的锌的提取。通过两级计数器电流溶剂萃取过程可以回收超过97％的溶解锌。在分离铜，钴和锌后，通过用锌粉或通过电环晶体可以容易地从溶液中容易地回收镉，而纯化的溶液可以回收回浸出过程。

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