Talk about the performance transformation of copper extractants in operation

Copper extractant manufacturers generally mix one, two or three of aldehyde oxime, ketone oxime and modified materials with curing agent. The groups with purification ability in aldoxime or ketoxime are methyl and oxime groups on the benzene ring. The reliability of oxime functional group is weak, and it is easy to be hydrolyzed and dissolved in acid-base environment, especially in strong acid environment. In the presence of oxidants, oxidative degradation is easy to occur. The paint thinner is generally C11-C16 ethane, which will continuously evaporate and flow out during operation, and the volume of organic phase will correspondingly decrease. The dissolution of aldoxime and ketoxime will also reduce the concentration of copper extractant, and the evaporation of paint thinner will also increase the concentration of copper extractant. If the copper extractant dissolves rapidly and the paint thinner evaporates slowly, the concentration of copper extractant will also decrease; Conversely, the concentration of copper extractant will increase due to the decrease of the total volume of organic phase.

For the purification management system with relatively stable PLS copper concentration value, the higher the concentration value of extractant in the organic phase is, the better it is, but it is stable at an effective level. On the one hand, if the concentration value is too high, the extractant will purify other residual metal ions after purifying copper, which will harm the quality of copper products.

On the other hand, the viscosity of the extractants will also increase, harming the phase separation characteristics. In addition, in the case of a certain carrying amount, the more the concentration value is, the greater the loss of extractant is. The concentration of natural extractant is too low, and the production will be affected because the purification level cannot be guaranteed.

The characteristics of copper extractants are mainly shown in the purification performance and phase separation performance

Purification characteristics also include copper bearing capacity, positive purification level, reverse purification level, purification kinetic model and copper/iron selectivity. Phase separation characteristics include phase separation velocity and carrier level. After the copper extractant is dissolved, the overall purification level will weaken. In particular, the reduction of aldoxime content has an impact on the purification level of the system. As time goes on, the purification capacity of the organic phase in operation will be more and more inconsistent with the new extractants used in stamping. If Cl - or NO3 - exists in the purification management system, the copper extractant will generate sodium cyanate or diazotization reaction with it to form the corresponding sodium cyanate extractant or nitration extractant.

Their purification ability is strong, but their separation level is relatively weak

The basic concentration of acid separation, such as 200g/L hydrochloric acid, cannot be separated from copper. The result is that the net copper migration level of the extractant decreases. After the extractant is dissolved, the purification kinetic model of the extractant will be slowed down, and the Cu/Fe selectivity will also become poor, if it is affected by the degradation products. If the organic phase is not purified for a long time, the continuous accumulation of degradation products in the purification system will also lead to the increase of the specific gravity and viscosity of organic chemistry, and the phase separation characteristics of the extractant will continue to decline.

That's all for the introduction of copper extractants. If you have any questions you don't understand, you can contact Xiao Bian, who will patiently answer them one by one.