Recovery of copper from simulated ammoniacal spent etchant using sterically hindered beta-diketone

The solvent extraction of copper from simulated ammoniacal spent etchant with 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 and phase ratio on the extraction of copper was studied at（298±0.5） K.For the spent etching solutions containing 112.98 g/L Cu,6 mol/L NH3 and 1 mol/L NH4＋,the optimal solvent extraction condition of copper was obtained in one-stage solvent extraction at phase ratio of 5：4 with 40% HR in sulphonated kerosene for 5 min.The copper concentration in the raffinate decreased to 63.24 g/L and raffinate can be favorably recycled to the etching solution.The stripping studies were carried out with the simulated copper spent electrolyte containing 30 g/L Cu and 180 g/L H2SO4.The stripping ratio is 98.27% from the loaded organic phase after one-stage stripping at phase ratio of 1：2 at（298±0.5） K.

实验探究情境中的“铁盐和亚铁盐”教学

在"铁盐和亚铁盐"的教学中,以电路板制作为真实情境引入,引导学生从价态观的角度思考Fe3+与Fe2+之间如何相互转化,进而进入如何再生刻蚀液的探究,电路板刻蚀这一情境由始至终贯穿在学生对知识的自主构建中,学生既能体会到实验对认识和研究物质性质的重要作用,又能将知识运用于废液回收利用,化"识"为"能"。