High Resistance Of ¦Â-diketone Synthesis And Ammonia Etching Liquid Waste Copper Extraction

With the rapid expansion of production scal of the PCB (printed circuit board), the amouth of copper etching waste produced in the production process of the PCB has increased. Since Ammonia hydrometallurgy leaching system has unique advantages in recovering copper from the copper etching waste liquid, it is widely used. Therefore, finding a suitable high-ammonia leaching system extractant has great meaning.In this paper, acetophenone, methanol are used as raw materials to synthesizd aβ-diketone by Claisen condensation. Improving the synthesis condition improve the yield ofβ-diketones. In this paper, IR NMR and mass spectrum are used to do detailed study of the synthsis of (3-diktones. The structure of the compound is determined according to the results of spectral analysis.By comparing to pH's effection on the extraction of copper content, the effections of the extraction agent concentration, reaction time, temperature have been studied. The results shows that in high concentration of copper etching, because copper concentration on the extraction is the dominant factors, while the temperature, pH on the extraction of copper has little effect, the reaction can reach equilibrium within the 2 min. If the concentration of extractant in organic phase is higher, with the conccentration increase, the extraction rate of copper increases.The solvent extraction of copper from simulated ammoniacal spent etchant using 1-(4'-dodecyl)-phenyl-3-tertiary butyl-1,3-octadione (HR) was studied, and a model of extraction isotherm was proposed and verified with equilibrium extraction constant. The influence of equilibration time, extractant concentration, phase ratio (O/A) on the extraction of copper were studied at 298K. For the spent etching solutions containing 112 g/L Cu,7 mol/L total ammonia solution, the solvent extraction condition of copper was obtained in one-stage solvent extraction at phase ratio of 3:4 with 40 vol% HR in sulphonated kerosene at 5 min. The copper concentration in the raffinate decreased to 63.24 g/L and the raffinate can be favorably recycled to the etching solution. The stripping studies were carried out with the simulated copper spent electrolyte containing 30g/L Cu and 180g/L H2SO4. The stripping ratio is 98.27% from the loaded organic phase after one-stage stripping at phase ratio of 1:2 at 298K. Electrolytic copper was obtained by electrolysis and the current efficiency reached 91.73%.