Prepation Of Potassum Perfhehat From Moymui Rating Fs Adsortpin Slolution

Rhenium is a high hardness, high melting point, high density precious metal. Its ductility, wear resistance,corrosion resistance is very good. Therefore, it is often used to make heat-resistant alloys, particularly for the manufacture of aircraft engine components , turbine blades and other high-end technical fields. However,the rhenium content in the earth’s crust is very low,most of which exists in other minerals associated. Thus, in the smelting process,it often run away along with the waste liquid ,resulting in the loss of the noble metal resources. This article aims to explore the best operating conditions,on which the D314 macroporous anion exchange resin can separate rhenium from the waste liquid better ,so that rhenium is separated and enriched successfully. In the experiment, the analytical methods of molybdenum and rhenium is the thiocyanate spectrophotometry, the catalyzed dynamics spectrophotometry successively. Their liner regression equations are y=0.00438x-0.0001, y=0.1165x-0.02773, with correlation coefficient r 0.9998, 0.9991 respectively. In raw material liquid, the molybdenum content is 14.207 g·L^-1 . Because the presence of the massive molybdenum interferes the determination of rhenium seriously, the working curve originally created no longer applies. The paper has tried to find out a new rhenium determination condition in the presence of a certain amount of molybdenum and ultimately a calibration curve has been created.Its regression equation is: y=0.1699x +0.3271, r=0.9969. In this way, the rhenium content in the raw material liquid is determinated accurately.The paper has carried on precipitation pretreatment to raw material liquid firstly, leaving the content of molybdenum and rhenium 78.28μg/mL, 198.50μg/mL separately and the ratio changed from 14:1 to approximately 2:5.Thus the molybdenum and rhenium has been preliminary separated. The precipitation rate for molybdenum is 98.75%, while the loss factor of rhenium is 2.68% .Through single-factor experiments , the defined optimal dynamic adsorption operating condition is: the pH of solution is 7.2 and the flowing speed is 0.5mL/min. Under this condition, the saturated adsorption capacity of D314 to molybdenum and rhenium is respectively 7.85mg/mL, 34.81mg/mL and the penetration adsorption capacity is 4.48mg/mL, 25.44mg/mL succesively. The molybdenum best desorption condition is: 0.20% NH3H2O+0.5% NH₄NO₃ solution, the desorption speed of flow is 0.5mL/min; The rhenium best desorption condition is: the 0.2%NaOH solution, the desorption speed of flow is 0.5mL/min. Under these conditions, the elution curve peaks are sharp and narrow, without trailing phenomenon. The volume ratio of molybdenum or rhenium strippant and the wet resin is respectively 13:1, 15:1. According to the ionic exchange dynamics model, According to the ion exchange dynamics model and through the experiment data fitting analysis, it is discovered that under the current experimental conditions, the adsorption process of D314 to molybdenum and rhenium is the second-level dsorption dynamics process,with its adsorption rate constant k 1.7901 mL·mg^-1·min^-1,0.2116mL·mg^-1·min^-1.Meanwhile, kinetic analysis showed that the adsorption rate was mainly governed by liquid film diffusion.Comparing the XRD spectra of the sample with the standard PDF cards, it is confirmed that the sample is potassium perrhenate with its high purity 99.15%.It is clear that separation efficiency of D314 resin to molybdenum and rhenium is high.