Discuss the performance changes of copper extractants and the considerations for their compatibility with industrial‑grade extractants.

Copper extractant Performance is primarily characterized by purification efficiency and phase‑separation behavior. Purification characteristics encompass several aspects, including high copper loading capacity, forward extraction efficiency, back‑extraction efficiency, the kinetic model of purification, and Cu/Fe selectivity. Phase‑separation characteristics, on the other hand, include phase‑separation rate and entrainment level. Copper extractant Once dissolution occurs, the overall purification efficiency declines, with a particularly pronounced adverse effect on the system’s purification capacity due to the reduction in aldoxime content.

Over time, the purification efficiency of the organic phase during operation becomes increasingly inconsistent with that achieved when using the fresh extractant in the initial stage. If Cl⁻ or NO₃⁻ is present in the purification system, the copper extractant may undergo chlorination or nitration reactions, forming corresponding chlorinated or nitrated extractants. These derivatives exhibit strong extraction performance but weak stripping capabilities; even a basic‑strength stripping acid such as 200 g/L hydrochloric acid struggles to strip copper effectively, ultimately leading to a decline in the net copper transfer efficiency of the extractant.

After dissolution, the copper extractant—affected by degradation products—exhibits a slowed purification kinetics, and its Cu/Fe selectivity deteriorates. If the organic phase remains unpurified for an extended period, the progressive accumulation of degradation products within the purification system leads to an increase in the organic phase’s specific gravity and viscosity, further degrading the extractant’s phase‑separation characteristics; in severe cases, inadequate phase separation may necessitate a shutdown.

Are metal‑extracting agents compatible with industrial extraction agents?

I. Extractants are widely used in the chemical processing of rare metals, including industries such as copper, zinc, cobalt–nickel, cadmium, gold and silver, platinum‑group metals, and rare earths.

The functions of extractants primarily include: separating the target metal from residual metal ions, concentrating the target metal ions, purifying metal ions, and altering the cationic species.

Metal‑extracting agents are typically common compounds such as ammonium sulfate, ammonium salts, and benzene, in which the hydroxyl group or a methyl group is replaced by a long‑chain alkyl group. When metals combine with these extractants, they form metal‑organic complexes that dissolve in the solvent. Because the degree of complexation varies among different metals and extractants, the order in which these extractants can purify metals differs, enabling the separation of metal ions.

II. In industrial applications, extractants are mostly soluble in organic solvents; common organic solvents include sulfonated kerosene (aromatic hydrocarbon oil No. 260) and environmentally friendly solvent oils. Moreover, these solvents exhibit a co‑extraction effect due to their minor content of aliphatic hydrocarbons. Solubility in organic solvents can also enhance the purity of the extractant, increase the solubility of its metal‑complex compounds, reduce viscosity, lower its volatility, and decrease its water solubility.

Sulfonated kerosene is characterized by a uniform and slow evaporation rate, a low content of aliphatic hydrocarbons, minimal toxic side effects, and a high safety profile. It is odorless, of high purity, leaves no residue upon volatilization, and resists oxidative degradation upon heating; its quality meets national industry standards. It serves as an excellent solvent for extracting rare‑earth oxide elements.

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