Nickel Extraction Lab Report

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At a constant interface area in double emulsion system and when the concentration of separated element in feed solution is much lower than the concentration of carrier in membrane and their chemical interaction does not change the concentration of carrier at interphase substantially, most of the results on membrane extraction (pertraction) can be approximated by a pseudo-first order kinetic law: Where R is the yield of recovery (dimensionless fraction) at time t and R is the yield at pseudo-equilibrium and k is the effective rate constant of membrane extraction (min-1), which consists from a hydro dynamically influenced part and distribution dependent part .Therefore, all results were statistically treated by standard least-square method on a PC computer (program) to obtain the…show more content…
The effect of the mixing speed on nickel extraction was presented in the figure (9). It was observed from figure (8), that increasing in nickel extraction percentage was observed to be very fast for all tested rpm at the end of first 2 min. After that time, changes in the percentage of nickel extraction were not sharp. In general, it was observed that the nickel extraction percentage was increased with increasing in mixing speed due to the large surface area of ELM. The increasing mixing speed causes an increase in the interfacial area between the membrane phase and the feed phase due to the formation of smaller globules smaller sized emulsion droplets were formed in 300 rpm, leading to a large surface area to provide the effective mass transfer. However, the stability of ELM was adversely affected with higher mixing speed leading to breakage around the ELM globules. So, the extraction rate of nickel was decreased and ELM stability was broken after the 4th min. It was clearly observed from figure (9) that stable extraction was achieved at the end of 10 min. with 250

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