气流量调控熔融 NaOH 中铼颗粒的高效回收OA

Rhenium(Re)is an extremely scarce and dispersed metallic element possessing the advantages of a high melting point and excellent ductility.It plays a vital role in the aerospace industry.With the advancement of aerospace technology,the demand for rhenium has increased,making its recovery a significant supply source.Addressing the complexities associated with high-purity rhenium metal recovery processes and the high cost of oxidizing agents,this paper proposes a novel molten NaOH oxidation process regulated by air flow.This method achieves highly efficient rhenium recovery by controlling both the alkali fusion duration and the gas flow rate.The study also elucidates the mechanisms governing the height of the NaOH melt surface,the control of oxidation efficiency,and the suppression of Re2O7 volatilization.Under the conditions where the mass ratio of Re to NaOH exceeds 2∶3,the molten NaOH liquid level is maintained≤2 mm above the rhenium particles,with an alkali fusion duration of 5 hours and a compressed air flow rate of 5 NL/min,rhenium is recovered in the form of NaReO4,achieving a recovery rate of 96.36%.Flue gas filtration analysis confirmed no loss of Re2O7.XRD and SEM characterization indicated that the product is a mixture of NaOH,Na2CO3,and NaReO4,facilitating subsequent hydrogen reduction processing.This process eliminates the need for oxidizing agent addition,establishing a new paradigm for the short-process recycling of rhenium resources.