Solvent extraction, solvent extraction is based on chemical processing of organic solvent to dissolve different for different metal ions of the metal ions in solution and therefore may be enriched and separated. For example, when an organic phase containing an organic agent is in contact with a solution phase (also referred to as an aqueous phase) containing metal ions, redistribution due to the difference in solubility of the metal ions in the two phases, thereby realizing enrichment of a metal in the organic phase And separated from other impurities. Now called the extraction agent in an N-510 on the extraction of copper-containing solution as an example to illustrate the effect of the extraction mechanism. N-510 is a oxindole type extractant, the full name is 2 hydroxy-5-sec-octyl xylene ketone oxime, and the molecular weight is 325.
When extracted, it forms a metal chelate with copper ions, which causes copper to be extracted and precipitates hydrogen ions. The reaction can be expressed by the following formula: Cu2+ (aqueous phase) + 2RH (organic phase) == CuR (organic phase) + 2H + (aqueous phase) The above reaction is reversible, in the weakly acidic medium, the metal chelate due to the reaction The stability of the compound is good, and the reaction proceeds to the right, that is, the extraction reaction. In a strongly acidic medium, the above reaction proceeds to the left, that is, the metal ion of the complex will be transferred from the organic phase to the aqueous phase, and the organic phase can be regenerated. This is called a "back extraction" reaction. The copper sulfate solution obtained by back extraction contains a relatively high concentration of copper ions, and the copper-rich solution is electrowinned to obtain an electric copper product having a higher purity.
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