Research On Adsorption Of Re From Electrolyte Of Superally By Using Macroporous Resin

Rhenium is a kind of expensive scattered refractory metal, which is widely used in the national defense science and industry fields. The rational use of Re resources not only can solve the problem of the sustainable development but also reduce pollution of the environment. In industry, recycling of Re is mainly used by solvent extraction method, but solvent extraction is volatile, flammable, toxic, environmental pollution. In this paper, the raw materials are aqua regia electrolyte solution from the scrap superalloys and anion exchange regenerative resin had been studied for recycling Re. This study is used for the application of precious metals processing technology to provide theoretical guidance and technical support.In this paper, the D296 anion-exchange resin was selected as a suitable adsorptive material by a variety of resins. In the static adsorption experiment, it had been found that the optimum adsorption temperature of Re was 293 K by D296 resin and the optimal p H was 4.0 and the optimum adsorption time was 30 min.. At these conditions, the maximum adsorption amount of Re by D296 resin was 61.4mg/g. In the static desorption experiment, the results showed that the optimal concentration of the NH4 SCN was 100 mg/m L;the optimal p H value was 10.0;the optimal temperature was 323K;the optimum adsorption time was 20 min.The effect of different ions on the adsorption of Re in D296 resin was investigated by ion interference experiments. The results showed that the existence of Ni²⁺, Co²⁺, Cr³⁺, Al³⁺ and Fe³⁺ ions did not affect the adsorption of Re but the existence of NO3- and Cl- ions would decrease the adsorption of Re and the effect of NO3- was greater.The adsorption and desorption experiments were studied by the breakthrough curve. The results showed that at room temperaturethe, optimal adsorption rate of electrolyte was 1m L/min and the maximum dynamic adsorption amount of Re by D296 resin was 64.7mg/g. The optimal desorption rate by NH4 SCN which was 100mg/m L p H 10.0 was 2m L/min. At this condition, the elution rate of NH4 SCN could be over 98% at 323 K.In this paper the adsorption mechanism of Re in the electrolyte of superalloys by D296 macroporous strong basicity was studied.. The thermodynamic studies showed that Freundlieh isotherm was more suitable for simulating Re exchange processed by D296 resin. It showed that the Re adsorptionion-exchange process was spontaneous（ D G<0） and exothermic（ D H>0）. High temperature was not conducive to the adsorption reaction of Re. The results of kinetic study showed that adsorption-ion exchange process was controlled by liquid film diffusion. During the FTIR, D296 resin skeleton made coordinate bond with Re O4 –.Ion exchange occurred between Re O4 – and active group.The optimum process parameters were studied to reduce the initial crystallization time and improve NH₄ReO₄ crystalline purity by NH₄ReO₄ crystallization purification experiments. NH₄ReO₄ purity was up to 99.9% by multiple times recrystallization.